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<!--XBRL Document Created with Wdesk from Workiva-->
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1"/>
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    <link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4057e57f-9221-4806-a013-f7f585abc07c_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]</link:label>
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    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_60b20b4a-7e3a-404b-814e-2a1c324fc8fa_totalLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net change in cash, cash equivalents and restricted cash</link:label>
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    <link:label id="lab_us-gaap_InterestIncomeOperating_d9e22999-00be-46ea-a4ff-3704ad84bd84_terseLabel_en-US" xlink:label="lab_us-gaap_InterestIncomeOperating" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest</link:label>
    <link:label id="lab_us-gaap_InterestIncomeOperating_label_en-US" xlink:label="lab_us-gaap_InterestIncomeOperating" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest Income, Operating</link:label>
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    <link:label id="lab_us-gaap_ConversionOfStockLineItems_59d5016f-84ff-42c7-b877-5c978f6bd21a_terseLabel_en-US" xlink:label="lab_us-gaap_ConversionOfStockLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of Stock [Line Items]</link:label>
    <link:label id="lab_us-gaap_ConversionOfStockLineItems_label_en-US" xlink:label="lab_us-gaap_ConversionOfStockLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of Stock [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConversionOfStockLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConversionOfStockLineItems" xlink:to="lab_us-gaap_ConversionOfStockLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments_de2c0948-b956-480c-a773-fc70fc09a543_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Convertible units to shares (in shares)</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments"/>
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    <link:label id="lab_sui_SunNGRVResortsMember_5cc7366b-5a02-4404-a5de-716591f96243_terseLabel_en-US" xlink:label="lab_sui_SunNGRVResortsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sun NG RV Resorts [Member]</link:label>
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    <link:label id="lab_sui_SunNGRVResortsMember_documentation_en-US" xlink:label="lab_sui_SunNGRVResortsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sun NG RV Resorts [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_SunNGRVResortsMember" xlink:href="sui-20210630.xsd#sui_SunNGRVResortsMember"/>
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    <link:label id="lab_sui_TransientRVRentalRevenueRecognizedPercentage_09f9a212-a699-4b31-8959-10eb6d16961c_terseLabel_en-US" xlink:label="lab_sui_TransientRVRentalRevenueRecognizedPercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Transient RV rental revenue recognized as a percentage</link:label>
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    <link:label id="lab_sui_TransientRVRentalRevenueRecognizedPercentage_documentation_en-US" xlink:label="lab_sui_TransientRVRentalRevenueRecognizedPercentage" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Transient RV Rental Revenue Recognized, Percentage</link:label>
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    <link:label id="lab_sui_CollateralizedReceivablesNetAndInstallmentNotesReceivablesOnManufacturedHomesMember_f3d2b9dd-7c06-4783-b075-b697c2231279_terseLabel_en-US" xlink:label="lab_sui_CollateralizedReceivablesNetAndInstallmentNotesReceivablesOnManufacturedHomesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collateralized receivables, net and Installment Notes Receivables on Manufactured Homes</link:label>
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    <link:label id="lab_dei_DocumentFiscalYearFocus_68c9f09a-3f78-45ed-b548-4558063f5582_terseLabel_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Fiscal Year Focus</link:label>
    <link:label id="lab_dei_DocumentFiscalYearFocus_label_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Fiscal Year Focus</link:label>
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    <link:label id="lab_us-gaap_LesseeLeaseDescriptionLineItems_18d0ff3b-4ff1-452b-bf55-cec5d5cfa5d6_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessee, Lease, Description [Line Items]</link:label>
    <link:label id="lab_us-gaap_LesseeLeaseDescriptionLineItems_label_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessee, Lease, Description [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
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    <link:label id="lab_sui_AwardDateThreeMember_label_en-US" xlink:label="lab_sui_AwardDateThreeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Award Date Three [Member]</link:label>
    <link:label id="lab_sui_AwardDateThreeMember_documentation_en-US" xlink:label="lab_sui_AwardDateThreeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Award Date Three</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_AwardDateThreeMember" xlink:href="sui-20210630.xsd#sui_AwardDateThreeMember"/>
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    <link:label id="lab_us-gaap_EarningsPerShareBasic_a527ac43-928e-4d5d-8355-394dfc2af174_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasic" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Per Share, Basic</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareBasic_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasic" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Per Share, Basic</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareBasic" xlink:to="lab_us-gaap_EarningsPerShareBasic" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_TemporaryEquityRedemptionPricePerShareIncludingAccruedandUnpaidDividends_6fdae3e5-18e9-4516-92e8-7f4b3e32a972_terseLabel_en-US" xlink:label="lab_sui_TemporaryEquityRedemptionPricePerShareIncludingAccruedandUnpaidDividends" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Redemption price including accrued and unpaid dividends (in dollars per share)</link:label>
    <link:label id="lab_sui_TemporaryEquityRedemptionPricePerShareIncludingAccruedandUnpaidDividends_label_en-US" xlink:label="lab_sui_TemporaryEquityRedemptionPricePerShareIncludingAccruedandUnpaidDividends" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary Equity, Redemption Price Per Share Including Accrued and Unpaid Dividends</link:label>
    <link:label id="lab_sui_TemporaryEquityRedemptionPricePerShareIncludingAccruedandUnpaidDividends_documentation_en-US" xlink:label="lab_sui_TemporaryEquityRedemptionPricePerShareIncludingAccruedandUnpaidDividends" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary Equity, Redemption Price Per Share Including Accrued and Unpaid Dividends</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_TemporaryEquityRedemptionPricePerShareIncludingAccruedandUnpaidDividends" xlink:href="sui-20210630.xsd#sui_TemporaryEquityRedemptionPricePerShareIncludingAccruedandUnpaidDividends"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_TemporaryEquityRedemptionPricePerShareIncludingAccruedandUnpaidDividends" xlink:to="lab_sui_TemporaryEquityRedemptionPricePerShareIncludingAccruedandUnpaidDividends" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerTextBlock_107bea1a-8598-4bc9-9e7b-3a0acb9ad4fc_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue</link:label>
    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerTextBlock_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue from Contract with Customer [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerTextBlock" xlink:to="lab_us-gaap_RevenueFromContractWithCustomerTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_RemeasurementOfMarketableSecurities_57b7c0ab-b71b-43e0-b57f-5614b11505dc_terseLabel_en-US" xlink:label="lab_sui_RemeasurementOfMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Remeasurement Of Marketable Securities</link:label>
    <link:label id="lab_sui_RemeasurementOfMarketableSecurities_label_en-US" xlink:label="lab_sui_RemeasurementOfMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Remeasurement Of Marketable Securities</link:label>
    <link:label id="lab_sui_RemeasurementOfMarketableSecurities_documentation_en-US" xlink:label="lab_sui_RemeasurementOfMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Remeasurement Of Marketable Securities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_RemeasurementOfMarketableSecurities" xlink:href="sui-20210630.xsd#sui_RemeasurementOfMarketableSecurities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_RemeasurementOfMarketableSecurities" xlink:to="lab_sui_RemeasurementOfMarketableSecurities" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentType_8eb14276-de0c-4fe8-a540-8ab544fee636_terseLabel_en-US" xlink:label="lab_dei_DocumentType" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Type</link:label>
    <link:label id="lab_dei_DocumentType_label_en-US" xlink:label="lab_dei_DocumentType" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Type</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentType"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentType" xlink:to="lab_dei_DocumentType" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InterestExpenseDebt_8e1ac665-e11f-487d-a0b7-7cf3877fb95d_terseLabel_en-US" xlink:label="lab_us-gaap_InterestExpenseDebt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest</link:label>
    <link:label id="lab_us-gaap_InterestExpenseDebt_label_en-US" xlink:label="lab_us-gaap_InterestExpenseDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest Expense, Debt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestExpenseDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestExpenseDebt" xlink:to="lab_us-gaap_InterestExpenseDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember_1cdceb55-328d-478a-981a-8ff5aae6fd4a_terseLabel_en-US" xlink:label="lab_us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]</link:label>
    <link:label id="lab_us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember_label_en-US" xlink:label="lab_us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember" xlink:to="lab_us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_InstallmentNotesReceivableOnManufacturedHomesNetMember_542ddd4f-92c6-441f-8f0d-9c3f19dccdbd_terseLabel_en-US" xlink:label="lab_sui_InstallmentNotesReceivableOnManufacturedHomesNetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Installment notes receivable on manufactured homes, net</link:label>
    <link:label id="lab_sui_InstallmentNotesReceivableOnManufacturedHomesNetMember_label_en-US" xlink:label="lab_sui_InstallmentNotesReceivableOnManufacturedHomesNetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Installment notes receivable on manufactured homes, net [Member]</link:label>
    <link:label id="lab_sui_InstallmentNotesReceivableOnManufacturedHomesNetMember_documentation_en-US" xlink:label="lab_sui_InstallmentNotesReceivableOnManufacturedHomesNetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Installment notes receivable on manufactured homes [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_InstallmentNotesReceivableOnManufacturedHomesNetMember" xlink:href="sui-20210630.xsd#sui_InstallmentNotesReceivableOnManufacturedHomesNetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_InstallmentNotesReceivableOnManufacturedHomesNetMember" xlink:to="lab_sui_InstallmentNotesReceivableOnManufacturedHomesNetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_VariableLeaseIncome_4beb4718-5d07-4a35-8b65-e3aa723d0c3f_terseLabel_en-US" xlink:label="lab_us-gaap_VariableLeaseIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Lease, Income</link:label>
    <link:label id="lab_us-gaap_VariableLeaseIncome_label_en-US" xlink:label="lab_us-gaap_VariableLeaseIncome" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Lease, Income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseIncome" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableLeaseIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableLeaseIncome" xlink:to="lab_us-gaap_VariableLeaseIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_KittatinnyPortfolioMember_504ed31a-35e1-4315-9b28-d320ef192282_terseLabel_en-US" xlink:label="lab_sui_KittatinnyPortfolioMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Kittatinny Portfolio</link:label>
    <link:label id="lab_sui_KittatinnyPortfolioMember_label_en-US" xlink:label="lab_sui_KittatinnyPortfolioMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Kittatinny Portfolio [Member]</link:label>
    <link:label id="lab_sui_KittatinnyPortfolioMember_documentation_en-US" xlink:label="lab_sui_KittatinnyPortfolioMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Kittatinny Portfolio</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_KittatinnyPortfolioMember" xlink:href="sui-20210630.xsd#sui_KittatinnyPortfolioMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_KittatinnyPortfolioMember" xlink:to="lab_sui_KittatinnyPortfolioMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_LesseeOperatingLeaseGrossBaseRent_1d6a981d-a4e8-48c8-848a-01d6b90c0273_terseLabel_en-US" xlink:label="lab_sui_LesseeOperatingLeaseGrossBaseRent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gross base rent (USD per sqft)</link:label>
    <link:label id="lab_sui_LesseeOperatingLeaseGrossBaseRent_label_en-US" xlink:label="lab_sui_LesseeOperatingLeaseGrossBaseRent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessee, Operating Lease, Gross Base Rent</link:label>
    <link:label id="lab_sui_LesseeOperatingLeaseGrossBaseRent_documentation_en-US" xlink:label="lab_sui_LesseeOperatingLeaseGrossBaseRent" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessee, Operating Lease, Gross Base Rent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_LesseeOperatingLeaseGrossBaseRent" xlink:href="sui-20210630.xsd#sui_LesseeOperatingLeaseGrossBaseRent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_LesseeOperatingLeaseGrossBaseRent" xlink:to="lab_sui_LesseeOperatingLeaseGrossBaseRent" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_TemporaryEquityDividends_6b8f97b6-3d96-4962-a7dc-f8da456eae4a_negatedTerseLabel_en-US" xlink:label="lab_sui_TemporaryEquityDividends" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Distributions</link:label>
    <link:label id="lab_sui_TemporaryEquityDividends_label_en-US" xlink:label="lab_sui_TemporaryEquityDividends" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary Equity, Dividends</link:label>
    <link:label id="lab_sui_TemporaryEquityDividends_documentation_en-US" xlink:label="lab_sui_TemporaryEquityDividends" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary Equity, Dividends</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_TemporaryEquityDividends" xlink:href="sui-20210630.xsd#sui_TemporaryEquityDividends"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_TemporaryEquityDividends" xlink:to="lab_sui_TemporaryEquityDividends" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueDisclosureItemAmountsDomain_6aff0866-ee86-4b6c-bea2-ac2e2b66d00d_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueDisclosureItemAmountsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value Measurement [Domain]</link:label>
    <link:label id="lab_us-gaap_FairValueDisclosureItemAmountsDomain_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosureItemAmountsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value Measurement [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain" xlink:to="lab_us-gaap_FairValueDisclosureItemAmountsDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityCurrentReportingStatus_020d94d1-e9c6-4a17-ba8b-d00322b239b3_terseLabel_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Current Reporting Status</link:label>
    <link:label id="lab_dei_EntityCurrentReportingStatus_label_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Current Reporting Status</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityCurrentReportingStatus"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCurrentReportingStatus" xlink:to="lab_dei_EntityCurrentReportingStatus" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_TimeBasedMember_a9fa0e41-d988-480c-94bd-d237a8578444_terseLabel_en-US" xlink:label="lab_sui_TimeBasedMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Time Based [Member]</link:label>
    <link:label id="lab_sui_TimeBasedMember_label_en-US" xlink:label="lab_sui_TimeBasedMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Time Based [Member]</link:label>
    <link:label id="lab_sui_TimeBasedMember_documentation_en-US" xlink:label="lab_sui_TimeBasedMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Time Based [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_TimeBasedMember" xlink:href="sui-20210630.xsd#sui_TimeBasedMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_TimeBasedMember" xlink:to="lab_sui_TimeBasedMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_ConversionofCommonOPUnitsMember_a2e8d326-e164-47d3-8f4f-5d5e95860f9b_terseLabel_en-US" xlink:label="lab_sui_ConversionofCommonOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of Common OP Units</link:label>
    <link:label id="lab_sui_ConversionofCommonOPUnitsMember_label_en-US" xlink:label="lab_sui_ConversionofCommonOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of Common OP Units [Member]</link:label>
    <link:label id="lab_sui_ConversionofCommonOPUnitsMember_documentation_en-US" xlink:label="lab_sui_ConversionofCommonOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of Common OP Units [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_ConversionofCommonOPUnitsMember" xlink:href="sui-20210630.xsd#sui_ConversionofCommonOPUnitsMember"/>
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    <link:label id="lab_us-gaap_SecuredDebt_fd63d623-22c0-411c-9195-15ad1a44c97a_terseLabel_en-US" xlink:label="lab_us-gaap_SecuredDebt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Secured Debt</link:label>
    <link:label id="lab_us-gaap_SecuredDebt_9c61dba8-871a-4da5-8486-e3880dd42f07_netLabel_en-US" xlink:label="lab_us-gaap_SecuredDebt" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Secured debt</link:label>
    <link:label id="lab_us-gaap_SecuredDebt_9e2c8f76-6ae6-4194-a3aa-53730c7e30f3_verboseLabel_en-US" xlink:label="lab_us-gaap_SecuredDebt" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total debt</link:label>
    <link:label id="lab_us-gaap_SecuredDebt_label_en-US" xlink:label="lab_us-gaap_SecuredDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Secured Debt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SecuredDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuredDebt" xlink:to="lab_us-gaap_SecuredDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_NumberOfDevelopedRecreationalVehicleSitesAcquired_f6f52142-f379-4207-831a-f2dfd73ed4ef_terseLabel_en-US" xlink:label="lab_sui_NumberOfDevelopedRecreationalVehicleSitesAcquired" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of recreational vehicle sites acquired (in developed sites)</link:label>
    <link:label id="lab_sui_NumberOfDevelopedRecreationalVehicleSitesAcquired_label_en-US" xlink:label="lab_sui_NumberOfDevelopedRecreationalVehicleSitesAcquired" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Developed Recreational Vehicle Sites Acquired</link:label>
    <link:label id="lab_sui_NumberOfDevelopedRecreationalVehicleSitesAcquired_documentation_en-US" xlink:label="lab_sui_NumberOfDevelopedRecreationalVehicleSitesAcquired" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Developed Recreational Vehicle Sites Acquired</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_NumberOfDevelopedRecreationalVehicleSitesAcquired" xlink:href="sui-20210630.xsd#sui_NumberOfDevelopedRecreationalVehicleSitesAcquired"/>
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    <link:label id="lab_sui_IslamoradaAndAnglerHouseMember_b9551151-c689-451d-994c-4f2e4dd5b5f1_terseLabel_en-US" xlink:label="lab_sui_IslamoradaAndAnglerHouseMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Islamorada and Angler House</link:label>
    <link:label id="lab_sui_IslamoradaAndAnglerHouseMember_label_en-US" xlink:label="lab_sui_IslamoradaAndAnglerHouseMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Islamorada and Angler House [Member]</link:label>
    <link:label id="lab_sui_IslamoradaAndAnglerHouseMember_documentation_en-US" xlink:label="lab_sui_IslamoradaAndAnglerHouseMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Islamorada and Angler House</link:label>
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    <link:label id="lab_us-gaap_TemporaryEquityParOrStatedValuePerShare_56a76233-91e0-4a44-9042-c76aed5f5b57_terseLabel_en-US" xlink:label="lab_us-gaap_TemporaryEquityParOrStatedValuePerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series A-4 Preferred Stock, Par Value</link:label>
    <link:label id="lab_us-gaap_TemporaryEquityParOrStatedValuePerShare_label_en-US" xlink:label="lab_us-gaap_TemporaryEquityParOrStatedValuePerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary Equity, Par or Stated Value Per Share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityParOrStatedValuePerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityParOrStatedValuePerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TemporaryEquityParOrStatedValuePerShare" xlink:to="lab_us-gaap_TemporaryEquityParOrStatedValuePerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PlanNameAxis_c4f70197-0151-45f8-bca4-3666382e658d_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Plan Name [Axis]</link:label>
    <link:label id="lab_us-gaap_PlanNameAxis_label_en-US" xlink:label="lab_us-gaap_PlanNameAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Plan Name [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PlanNameAxis" xlink:to="lab_us-gaap_PlanNameAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LongTermDebt_31af3ec9-a7dd-4bd2-ae18-96de20a8e07f_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-term Debt</link:label>
    <link:label id="lab_us-gaap_LongTermDebt_label_en-US" xlink:label="lab_us-gaap_LongTermDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-term Debt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebt" xlink:to="lab_us-gaap_LongTermDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_RentalHomeRevenue_a607d970-15d8-408c-aa45-88a9e2066cdc_terseLabel_en-US" xlink:label="lab_sui_RentalHomeRevenue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rental home revenue</link:label>
    <link:label id="lab_sui_RentalHomeRevenue_label_en-US" xlink:label="lab_sui_RentalHomeRevenue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rental home revenue</link:label>
    <link:label id="lab_sui_RentalHomeRevenue_documentation_en-US" xlink:label="lab_sui_RentalHomeRevenue" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rental home revenue</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_RentalHomeRevenue" xlink:href="sui-20210630.xsd#sui_RentalHomeRevenue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_RentalHomeRevenue" xlink:to="lab_sui_RentalHomeRevenue" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_PurchasesAndIssuancesMember_ca647201-46d3-4612-9a3e-b9fed703f9ab_terseLabel_en-US" xlink:label="lab_sui_PurchasesAndIssuancesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchases and Issuances</link:label>
    <link:label id="lab_sui_PurchasesAndIssuancesMember_label_en-US" xlink:label="lab_sui_PurchasesAndIssuancesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchases and Issuances [Member]</link:label>
    <link:label id="lab_sui_PurchasesAndIssuancesMember_documentation_en-US" xlink:label="lab_sui_PurchasesAndIssuancesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Purchases and Issuances</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_PurchasesAndIssuancesMember" xlink:href="sui-20210630.xsd#sui_PurchasesAndIssuancesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_PurchasesAndIssuancesMember" xlink:to="lab_sui_PurchasesAndIssuancesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueInputsLevel1Member_cec12f82-61cf-411a-8a89-1d63fc628058_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value, Inputs, Level 1</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel1Member" xlink:to="lab_us-gaap_FairValueInputsLevel1Member" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_c513eb02-746b-48b2-9a36-fac4e10cb206_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">INVESTING ACTIVITIES:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_GoodwillImpairmentLoss_0898264f-4a2a-4a3b-bfb5-56962a165d7b_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillImpairmentLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Goodwill, Impairment Loss</link:label>
    <link:label id="lab_us-gaap_GoodwillImpairmentLoss_label_en-US" xlink:label="lab_us-gaap_GoodwillImpairmentLoss" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Goodwill, Impairment Loss</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GoodwillImpairmentLoss" xlink:to="lab_us-gaap_GoodwillImpairmentLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_RVCommunityMember_5eb72a41-1ed6-4374-944f-ba9232b2cbd6_terseLabel_en-US" xlink:label="lab_sui_RVCommunityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">RV Community</link:label>
    <link:label id="lab_sui_RVCommunityMember_label_en-US" xlink:label="lab_sui_RVCommunityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">RV Community [Member]</link:label>
    <link:label id="lab_sui_RVCommunityMember_documentation_en-US" xlink:label="lab_sui_RVCommunityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">RV Community</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_RVCommunityMember" xlink:href="sui-20210630.xsd#sui_RVCommunityMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_RVCommunityMember" xlink:to="lab_sui_RVCommunityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_NotesReceivableFromRealEstateDevelopersMember_0a0ff922-7201-4c62-99cc-1ee805b7e2c2_terseLabel_en-US" xlink:label="lab_sui_NotesReceivableFromRealEstateDevelopersMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes Receivable from Real Estate Developers</link:label>
    <link:label id="lab_sui_NotesReceivableFromRealEstateDevelopersMember_label_en-US" xlink:label="lab_sui_NotesReceivableFromRealEstateDevelopersMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes Receivable from Real Estate Developers [Member]</link:label>
    <link:label id="lab_sui_NotesReceivableFromRealEstateDevelopersMember_documentation_en-US" xlink:label="lab_sui_NotesReceivableFromRealEstateDevelopersMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes Receivable from Real Estate Developers</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_NotesReceivableFromRealEstateDevelopersMember" xlink:href="sui-20210630.xsd#sui_NotesReceivableFromRealEstateDevelopersMember"/>
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    <link:label id="lab_us-gaap_OtherLiabilities_f8f5fa95-b210-4714-85f9-03eb109179d0_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Liabilities</link:label>
    <link:label id="lab_us-gaap_OtherLiabilities_b32ae998-fd25-4813-a3a2-902385143d7d_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilities" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other liabilities</link:label>
    <link:label id="lab_us-gaap_OtherLiabilities_label_en-US" xlink:label="lab_us-gaap_OtherLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherLiabilities" xlink:to="lab_us-gaap_OtherLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncomeTaxDisclosureAbstract_e128583e-0352-428f-bb41-f0af5f9bb8de_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Tax Disclosure [Abstract]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract" xlink:to="lab_us-gaap_IncomeTaxDisclosureAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_432d07cf-eada-4ec0-bd2b-e4c35ca4a76f_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessee, Operating Lease, Liability, Payment, Due [Abstract]</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessee, Operating Lease, Liability, Payment, Due [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract"/>
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    <link:label id="lab_sui_CiscoGroveCampResortMember_8f6b860c-af96-4159-93b6-5ce7ceb77698_terseLabel_en-US" xlink:label="lab_sui_CiscoGroveCampResortMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cisco Grove Camp Resort</link:label>
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    <link:label id="lab_us-gaap_CommercialMortgageBackedSecuritiesMember_02f05d4a-4506-4344-b7a8-a22de1713a98_verboseLabel_en-US" xlink:label="lab_us-gaap_CommercialMortgageBackedSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collateralized term loans - CMBS [Member]</link:label>
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    <link:label id="lab_sui_JellystoneNaturalBridgeMember_b3c05875-7e19-4ee0-a493-05bc7ea14163_terseLabel_en-US" xlink:label="lab_sui_JellystoneNaturalBridgeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Blue Water Beach Resort</link:label>
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    <link:label id="lab_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_62ad62f7-3e14-4d80-885e-1b838121b638_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net income attributable to Sun Communities, Inc. common stockholders</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquireAndDevelopRealEstate_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireAndDevelopRealEstate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payments to Acquire and Develop Real Estate</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireAndDevelopRealEstate" xlink:to="lab_us-gaap_PaymentsToAcquireAndDevelopRealEstate" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncomeTaxAuthorityAxis_04b1dac8-fc20-4b91-b284-ddf4bdb92a3c_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxAuthorityAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Tax Authority [Axis]</link:label>
    <link:label id="lab_us-gaap_IncomeTaxAuthorityAxis_label_en-US" xlink:label="lab_us-gaap_IncomeTaxAuthorityAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Tax Authority [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis" xlink:to="lab_us-gaap_IncomeTaxAuthorityAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_A2004NonemployeePlanMember_4d44a27d-3ae0-460b-8deb-474f24a1688a_terseLabel_en-US" xlink:label="lab_sui_A2004NonemployeePlanMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2004 Non-employee Plan [Member]</link:label>
    <link:label id="lab_sui_A2004NonemployeePlanMember_label_en-US" xlink:label="lab_sui_A2004NonemployeePlanMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2004 Non-employee Plan [Member]</link:label>
    <link:label id="lab_sui_A2004NonemployeePlanMember_documentation_en-US" xlink:label="lab_sui_A2004NonemployeePlanMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2004 non-employee plan [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_A2004NonemployeePlanMember" xlink:href="sui-20210630.xsd#sui_A2004NonemployeePlanMember"/>
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    <link:label id="lab_sui_NotesReceivableFairValueAdjustment_223ec584-c4a0-4fc7-ae30-63fde1ffc195_terseLabel_en-US" xlink:label="lab_sui_NotesReceivableFairValueAdjustment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes receivable, fair value adjustment</link:label>
    <link:label id="lab_sui_NotesReceivableFairValueAdjustment_label_en-US" xlink:label="lab_sui_NotesReceivableFairValueAdjustment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes Receivable, Fair Value Adjustment</link:label>
    <link:label id="lab_sui_NotesReceivableFairValueAdjustment_documentation_en-US" xlink:label="lab_sui_NotesReceivableFairValueAdjustment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes Receivable, Fair Value Adjustment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_NotesReceivableFairValueAdjustment" xlink:href="sui-20210630.xsd#sui_NotesReceivableFairValueAdjustment"/>
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    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_d3420956-625b-4627-96bd-4e82faa9da29_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Thereafter</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance Lease, Liability, to be Paid, after Year Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CommonStockDividendsPerShareDeclared_e852dabc-29f1-44e4-8ae3-868b13ac7c9e_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockDividendsPerShareDeclared" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividends per common share</link:label>
    <link:label id="lab_us-gaap_CommonStockDividendsPerShareDeclared_label_en-US" xlink:label="lab_us-gaap_CommonStockDividendsPerShareDeclared" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Stock, Dividends, Per Share, Declared</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
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    <link:label id="lab_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock_3d877386-5815-44a7-82f2-0003c7b00eb9_terseLabel_en-US" xlink:label="lab_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes And Other Receivables</link:label>
    <link:label id="lab_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock_label_en-US" xlink:label="lab_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loans, Notes, Trade and Other Receivables Disclosure [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock" xlink:to="lab_us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_SafeHarborAnacapaIsleMember_439ca9fe-63ef-4bf7-a383-6721f7c15069_terseLabel_en-US" xlink:label="lab_sui_SafeHarborAnacapaIsleMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Safe Harbor Anacapa Isle</link:label>
    <link:label id="lab_sui_SafeHarborAnacapaIsleMember_label_en-US" xlink:label="lab_sui_SafeHarborAnacapaIsleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Safe Harbor Anacapa Isle [Member]</link:label>
    <link:label id="lab_sui_SafeHarborAnacapaIsleMember_documentation_en-US" xlink:label="lab_sui_SafeHarborAnacapaIsleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Safe Harbor Anacapa Isle</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_SafeHarborAnacapaIsleMember" xlink:href="sui-20210630.xsd#sui_SafeHarborAnacapaIsleMember"/>
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    <link:label id="lab_us-gaap_EmployeeStockOptionMember_58c55ea5-8735-4fd3-8601-8242ae4d4e94_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeStockOptionMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payment Arrangement, Option</link:label>
    <link:label id="lab_us-gaap_EmployeeStockOptionMember_label_en-US" xlink:label="lab_us-gaap_EmployeeStockOptionMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Payment Arrangement, Option [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeStockOptionMember" xlink:to="lab_us-gaap_EmployeeStockOptionMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PledgedAssetsNotSeparatelyReportedRealEstate_7d503b11-a25a-433a-bec0-03f8f126d002_terseLabel_en-US" xlink:label="lab_us-gaap_PledgedAssetsNotSeparatelyReportedRealEstate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net book value of properties securing collateralized term loans</link:label>
    <link:label id="lab_us-gaap_PledgedAssetsNotSeparatelyReportedRealEstate_label_en-US" xlink:label="lab_us-gaap_PledgedAssetsNotSeparatelyReportedRealEstate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Pledged Assets, Not Separately Reported, Real Estate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedAssetsNotSeparatelyReportedRealEstate" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PledgedAssetsNotSeparatelyReportedRealEstate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PledgedAssetsNotSeparatelyReportedRealEstate" xlink:to="lab_us-gaap_PledgedAssetsNotSeparatelyReportedRealEstate" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_MarketableSecuritiesMember_cbe11abe-e10e-4257-ba3b-4ff2a248c73b_terseLabel_en-US" xlink:label="lab_sui_MarketableSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Marketable Securities [Member]</link:label>
    <link:label id="lab_sui_MarketableSecuritiesMember_label_en-US" xlink:label="lab_sui_MarketableSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Marketable Securities [Member]</link:label>
    <link:label id="lab_sui_MarketableSecuritiesMember_documentation_en-US" xlink:label="lab_sui_MarketableSecuritiesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Marketable Securities [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_MarketableSecuritiesMember" xlink:href="sui-20210630.xsd#sui_MarketableSecuritiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_MarketableSecuritiesMember" xlink:to="lab_sui_MarketableSecuritiesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_TemporaryEquityTerm_02c23112-8a52-40c8-9718-6bf2d046f9f1_terseLabel_en-US" xlink:label="lab_sui_TemporaryEquityTerm" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary Equity, Term</link:label>
    <link:label id="lab_sui_TemporaryEquityTerm_label_en-US" xlink:label="lab_sui_TemporaryEquityTerm" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary Equity, Term</link:label>
    <link:label id="lab_sui_TemporaryEquityTerm_documentation_en-US" xlink:label="lab_sui_TemporaryEquityTerm" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary Equity, Term</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_TemporaryEquityTerm" xlink:href="sui-20210630.xsd#sui_TemporaryEquityTerm"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_TemporaryEquityTerm" xlink:to="lab_sui_TemporaryEquityTerm" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_732db73b-2114-41e3-be6d-4036ffbf47c4_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value Hierarchy and NAV [Axis]</link:label>
    <link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_label_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value Hierarchy and NAV [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_ConsolidationItemsDomain_e649f4c3-0d6b-4d02-9118-f24168c1d49c_terseLabel_en-US" xlink:label="lab_srt_ConsolidationItemsDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consolidation Items [Domain]</link:label>
    <link:label id="lab_srt_ConsolidationItemsDomain_label_en-US" xlink:label="lab_srt_ConsolidationItemsDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consolidation Items [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ConsolidationItemsDomain" xlink:to="lab_srt_ConsolidationItemsDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EquityAbstract_6aa188e3-1426-48d2-8c08-a3103093fdbb_terseLabel_en-US" xlink:label="lab_us-gaap_EquityAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity [Abstract]</link:label>
    <link:label id="lab_us-gaap_EquityAbstract_label_en-US" xlink:label="lab_us-gaap_EquityAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquityAbstract" xlink:to="lab_us-gaap_EquityAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ConvertibleNotesPayable_19293fef-91ab-43d9-8624-2697436a1fe1_terseLabel_en-US" xlink:label="lab_us-gaap_ConvertibleNotesPayable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Convertible Notes Payable</link:label>
    <link:label id="lab_us-gaap_ConvertibleNotesPayable_label_en-US" xlink:label="lab_us-gaap_ConvertibleNotesPayable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Convertible Notes Payable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleNotesPayable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertibleNotesPayable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConvertibleNotesPayable" xlink:to="lab_us-gaap_ConvertibleNotesPayable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_85db8439-1211-49cb-9c51-196317af0e4d_terseLabel_en-US" xlink:label="lab_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Effect of exchange rate changes on cash, cash equivalents and restricted cash</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents"/>
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    <link:label id="lab_sui_RentalHomeRevenueMember_64d50b5b-be85-46f6-a57e-ed8148194bff_terseLabel_en-US" xlink:label="lab_sui_RentalHomeRevenueMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rental Home Revenue [Member]</link:label>
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    <link:label id="lab_us-gaap_VariableRateDomain_label_en-US" xlink:label="lab_us-gaap_VariableRateDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Rate [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
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    <link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_06dd38a2-ebf0-4970-bf07-60f31963205a_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Additional Paid-in Capital</link:label>
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    <link:label id="lab_us-gaap_LinesOfCreditFairValueDisclosure_78efc877-4da1-4475-ac07-5a7a3138a3b3_terseLabel_en-US" xlink:label="lab_us-gaap_LinesOfCreditFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lines of credit</link:label>
    <link:label id="lab_us-gaap_LinesOfCreditFairValueDisclosure_label_en-US" xlink:label="lab_us-gaap_LinesOfCreditFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lines of Credit, Fair Value Disclosure</link:label>
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    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_990e0cd6-00fb-4410-a193-d93ca022296d_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-term Debt, Type [Domain]</link:label>
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    <link:label id="lab_us-gaap_RealEstateInvestmentsJointVentures_e2275269-a721-4627-9f33-43c8f203cc1c_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentsJointVentures" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Real Estate Investments, Joint Ventures</link:label>
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    <link:label id="lab_sui_PleasantBeachCampgroundMember_5dc04c65-6511-44fc-9e51-bd2d2f91c4cc_terseLabel_en-US" xlink:label="lab_sui_PleasantBeachCampgroundMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Pleasant Beach Campground</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_61375e76-2410-4bb2-89ec-62dcf091dd51_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt instrument, face amount</link:label>
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    <link:label id="lab_sui_PreferredreturntoSeriesA1preferredOPunits_302165bd-2115-4248-8ae9-e51b93dd711b_negatedTerseLabel_en-US" xlink:label="lab_sui_PreferredreturntoSeriesA1preferredOPunits" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Less: Preferred return to preferred OP units / equity</link:label>
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    <link:label id="lab_sui_PreferredreturntoSeriesA1preferredOPunits_documentation_en-US" xlink:label="lab_sui_PreferredreturntoSeriesA1preferredOPunits" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred return to convertible, non-redeemable Series A-1 Preferred Operating Partnership unit holders.</link:label>
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    <link:label id="lab_us-gaap_RentalProperties_d39e560b-0cca-4914-8d26-9d79d3aa2bd5_terseLabel_en-US" xlink:label="lab_us-gaap_RentalProperties" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rental homes and improvements</link:label>
    <link:label id="lab_us-gaap_RentalProperties_label_en-US" xlink:label="lab_us-gaap_RentalProperties" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Rental Properties</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RentalProperties" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RentalProperties"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RentalProperties" xlink:to="lab_us-gaap_RentalProperties" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SharePrice_e8376dad-bdb7-44bd-b05e-efa40ea8b347_terseLabel_en-US" xlink:label="lab_us-gaap_SharePrice" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share Price</link:label>
    <link:label id="lab_us-gaap_SharePrice_label_en-US" xlink:label="lab_us-gaap_SharePrice" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share Price</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharePrice" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharePrice"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharePrice" xlink:to="lab_us-gaap_SharePrice" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OperatingSegmentsMember_5e5527bf-b062-4b97-98f0-a47fe9f4da9c_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingSegmentsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Segments [Member]</link:label>
    <link:label id="lab_us-gaap_OperatingSegmentsMember_label_en-US" xlink:label="lab_us-gaap_OperatingSegmentsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Segments [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingSegmentsMember" xlink:to="lab_us-gaap_OperatingSegmentsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ConversionOfStockAmountConverted1_a72db51b-dc82-4c94-bcac-ed731fcbb81a_terseLabel_en-US" xlink:label="lab_us-gaap_ConversionOfStockAmountConverted1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of common and preferred OP units</link:label>
    <link:label id="lab_us-gaap_ConversionOfStockAmountConverted1_label_en-US" xlink:label="lab_us-gaap_ConversionOfStockAmountConverted1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of Stock, Amount Converted</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockAmountConverted1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConversionOfStockAmountConverted1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConversionOfStockAmountConverted1" xlink:to="lab_us-gaap_ConversionOfStockAmountConverted1" xlink:type="arc" order="1"/>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock"/>
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    <link:label id="lab_us-gaap_FinanceLeaseLiability_9cd18380-0ac0-4c79-9919-0f0b91081d93_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiability" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Present Value of Lease Liabilities</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiability_dbe30c85-8aa8-46fb-92d9-b394f3770f3f_verboseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiability" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance lease liability</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiability_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiability" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance Lease, Liability</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiability" xlink:to="lab_us-gaap_FinanceLeaseLiability" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_RiverPlantationMember_fdc035f1-8fa8-4b5b-b911-58ea2a412dcc_terseLabel_en-US" xlink:label="lab_sui_RiverPlantationMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Jellystone Lone Star</link:label>
    <link:label id="lab_sui_RiverPlantationMember_label_en-US" xlink:label="lab_sui_RiverPlantationMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">River Plantation [Member]</link:label>
    <link:label id="lab_sui_RiverPlantationMember_documentation_en-US" xlink:label="lab_sui_RiverPlantationMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">River Plantation [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_RiverPlantationMember" xlink:href="sui-20210630.xsd#sui_RiverPlantationMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_RiverPlantationMember" xlink:to="lab_sui_RiverPlantationMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DeferredIncomeTaxLiabilities_f0fd9285-9231-4946-925f-536e9c3877b6_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred Tax Liabilities, Gross</link:label>
    <link:label id="lab_us-gaap_DeferredIncomeTaxLiabilities_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Deferred Tax Liabilities, Gross</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities" xlink:to="lab_us-gaap_DeferredIncomeTaxLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_BusinessAcquisitionLineItems_fceb00be-2f05-4259-b58d-478709e06ec0_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Acquisition [Line Items]</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionLineItems_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Acquisition [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems" xlink:to="lab_us-gaap_BusinessAcquisitionLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_ScheduleofFiniteLivedIntangibleAssetsAmortizationExpenseTable_b4dbdd4d-17b4-4099-9d26-0c327f671029_terseLabel_en-US" xlink:label="lab_sui_ScheduleofFiniteLivedIntangibleAssetsAmortizationExpenseTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Finite-Lived Intangible Assets, Amortization Expense [Table]</link:label>
    <link:label id="lab_sui_ScheduleofFiniteLivedIntangibleAssetsAmortizationExpenseTable_label_en-US" xlink:label="lab_sui_ScheduleofFiniteLivedIntangibleAssetsAmortizationExpenseTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Finite-Lived Intangible Assets, Amortization Expense [Table]</link:label>
    <link:label id="lab_sui_ScheduleofFiniteLivedIntangibleAssetsAmortizationExpenseTable_documentation_en-US" xlink:label="lab_sui_ScheduleofFiniteLivedIntangibleAssetsAmortizationExpenseTable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tabular disclosure of amortization expense related to finite-lived intangible assets by category.</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_ScheduleofFiniteLivedIntangibleAssetsAmortizationExpenseTable" xlink:href="sui-20210630.xsd#sui_ScheduleofFiniteLivedIntangibleAssetsAmortizationExpenseTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_ScheduleofFiniteLivedIntangibleAssetsAmortizationExpenseTable" xlink:to="lab_sui_ScheduleofFiniteLivedIntangibleAssetsAmortizationExpenseTable" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_SafeHarborMarinasFourPropertiesMember_05289bf0-fd43-4d01-89c3-e096b91dba00_terseLabel_en-US" xlink:label="lab_sui_SafeHarborMarinasFourPropertiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Safe Harbor Marinas Four Properties</link:label>
    <link:label id="lab_sui_SafeHarborMarinasFourPropertiesMember_label_en-US" xlink:label="lab_sui_SafeHarborMarinasFourPropertiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Safe Harbor Marinas Four Properties [Member]</link:label>
    <link:label id="lab_sui_SafeHarborMarinasFourPropertiesMember_documentation_en-US" xlink:label="lab_sui_SafeHarborMarinasFourPropertiesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Safe Harbor Marinas Four Properties</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_SafeHarborMarinasFourPropertiesMember" xlink:href="sui-20210630.xsd#sui_SafeHarborMarinasFourPropertiesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_SafeHarborMarinasFourPropertiesMember" xlink:to="lab_sui_SafeHarborMarinasFourPropertiesMember" xlink:type="arc" order="1"/>
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    <link:label id="lab_sui_LineOfCreditManufacturedHomeFloorPlanFacilityMember_d0c3c0de-6744-44d1-942f-0dee59c06fc4_terseLabel_en-US" xlink:label="lab_sui_LineOfCreditManufacturedHomeFloorPlanFacilityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of credit - manufactured home floor plan facility [Member]</link:label>
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    <link:label id="lab_us-gaap_DistributionsOnMandatorilyRedeemableSecurities_bae6f7c8-6b22-47f8-b57a-62de1d192167_terseLabel_en-US" xlink:label="lab_us-gaap_DistributionsOnMandatorilyRedeemableSecurities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash paid for interest on mandatorily redeemable debt</link:label>
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    <link:label id="lab_sui_NumberOfLandParcelsAcquired_189bb5a9-8d06-44e4-8773-8714dc74aa4c_terseLabel_en-US" xlink:label="lab_sui_NumberOfLandParcelsAcquired" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Land Parcels Acquired</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_8e841abb-d1d0-4929-9eb0-f0b5edbecf28_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Current tax expense</link:label>
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    <link:label id="lab_us-gaap_DividendsPayableTable_9b23bc7c-d18d-4571-98b5-0a1786d31ef7_terseLabel_en-US" xlink:label="lab_us-gaap_DividendsPayableTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividends Payable [Table]</link:label>
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    <link:label id="lab_sui_EquityTransactionTypeDomain_e01fb84c-4236-4484-847e-3072422f9f97_terseLabel_en-US" xlink:label="lab_sui_EquityTransactionTypeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity transaction type [Domain]</link:label>
    <link:label id="lab_sui_EquityTransactionTypeDomain_label_en-US" xlink:label="lab_sui_EquityTransactionTypeDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity transaction type [Domain]</link:label>
    <link:label id="lab_sui_EquityTransactionTypeDomain_documentation_en-US" xlink:label="lab_sui_EquityTransactionTypeDomain" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity transaction type [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_EquityTransactionTypeDomain" xlink:href="sui-20210630.xsd#sui_EquityTransactionTypeDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_EquityTransactionTypeDomain" xlink:to="lab_sui_EquityTransactionTypeDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AdjustmentsForErrorCorrectionDomain_136e3bd6-dcea-4bf7-ad8c-672223fd25f7_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsForErrorCorrectionDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Adjustments for Error Correction [Domain]</link:label>
    <link:label id="lab_us-gaap_AdjustmentsForErrorCorrectionDomain_label_en-US" xlink:label="lab_us-gaap_AdjustmentsForErrorCorrectionDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Error Correction, Type [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsForErrorCorrectionDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsForErrorCorrectionDomain"/>
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    <link:label id="lab_us-gaap_EquityComponentDomain_d45a41a7-5685-4e68-89b7-e5dd578efe7d_terseLabel_en-US" xlink:label="lab_us-gaap_EquityComponentDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Component [Domain]</link:label>
    <link:label id="lab_us-gaap_EquityComponentDomain_label_en-US" xlink:label="lab_us-gaap_EquityComponentDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Component [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
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    <link:label id="lab_us-gaap_OtherReceivables_6a85ef0c-97cd-4366-ab40-4ffc459cec5b_terseLabel_en-US" xlink:label="lab_us-gaap_OtherReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Receivables</link:label>
    <link:label id="lab_us-gaap_OtherReceivables_label_en-US" xlink:label="lab_us-gaap_OtherReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivables" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherReceivables" xlink:to="lab_us-gaap_OtherReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_CommissionMaximumPercentageofGrossSalesPricePerShareAccordingtoSalesAgreement_8aab5ab8-06fc-4350-a38b-6b032b65e261_terseLabel_en-US" xlink:label="lab_sui_CommissionMaximumPercentageofGrossSalesPricePerShareAccordingtoSalesAgreement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commission, Maximum Percentage of Gross Sales Price Per Share According to Sales Agreement</link:label>
    <link:label id="lab_sui_CommissionMaximumPercentageofGrossSalesPricePerShareAccordingtoSalesAgreement_label_en-US" xlink:label="lab_sui_CommissionMaximumPercentageofGrossSalesPricePerShareAccordingtoSalesAgreement" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commission, Maximum Percentage of Gross Sales Price Per Share According to Sales Agreement</link:label>
    <link:label id="lab_sui_CommissionMaximumPercentageofGrossSalesPricePerShareAccordingtoSalesAgreement_documentation_en-US" xlink:label="lab_sui_CommissionMaximumPercentageofGrossSalesPricePerShareAccordingtoSalesAgreement" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commission, Maximum Percentage of Gross Sales Price Per Share According to Sales Agreement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_CommissionMaximumPercentageofGrossSalesPricePerShareAccordingtoSalesAgreement" xlink:href="sui-20210630.xsd#sui_CommissionMaximumPercentageofGrossSalesPricePerShareAccordingtoSalesAgreement"/>
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    <link:label id="lab_sui_AggregateValueofSharestobeIssuedinAccordancetoSalesAgreement_a044ecf0-e8e5-4787-a877-b719402be4d6_terseLabel_en-US" xlink:label="lab_sui_AggregateValueofSharestobeIssuedinAccordancetoSalesAgreement" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Aggregate Value of Shares to be Issued in Accordance to Sales Agreement</link:label>
    <link:label id="lab_sui_AggregateValueofSharestobeIssuedinAccordancetoSalesAgreement_label_en-US" xlink:label="lab_sui_AggregateValueofSharestobeIssuedinAccordancetoSalesAgreement" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Aggregate Value of Shares to be Issued in Accordance to Sales Agreement</link:label>
    <link:label id="lab_sui_AggregateValueofSharestobeIssuedinAccordancetoSalesAgreement_documentation_en-US" xlink:label="lab_sui_AggregateValueofSharestobeIssuedinAccordancetoSalesAgreement" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Aggregate Value of Shares to be Issued in Accordance to Sales Agreement</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_AggregateValueofSharestobeIssuedinAccordancetoSalesAgreement" xlink:to="lab_sui_AggregateValueofSharestobeIssuedinAccordancetoSalesAgreement" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_NumberofRVSites_b1c95bf6-438a-415c-8f2c-950d6034dd14_terseLabel_en-US" xlink:label="lab_sui_NumberofRVSites" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of RV sites (in sites)</link:label>
    <link:label id="lab_sui_NumberofRVSites_label_en-US" xlink:label="lab_sui_NumberofRVSites" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of RV Sites</link:label>
    <link:label id="lab_sui_NumberofRVSites_documentation_en-US" xlink:label="lab_sui_NumberofRVSites" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of RV Sites</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_NumberofRVSites" xlink:href="sui-20210630.xsd#sui_NumberofRVSites"/>
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    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_3c16945a-a9e3-448d-9313-cc684edd1652_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2021 (Excluding six months ended June 30, 2021)</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessee, Operating Lease, Liability, to be Paid, Year One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_AssociationIslandKOAMember_a5dc4045-423d-4571-9abd-79092767e086_terseLabel_en-US" xlink:label="lab_sui_AssociationIslandKOAMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Associate Island KOA</link:label>
    <link:label id="lab_sui_AssociationIslandKOAMember_label_en-US" xlink:label="lab_sui_AssociationIslandKOAMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Association Island KOA [Member]</link:label>
    <link:label id="lab_sui_AssociationIslandKOAMember_documentation_en-US" xlink:label="lab_sui_AssociationIslandKOAMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Association Island KOA</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_581d1c4d-ad74-4083-886f-3797d83af01e_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Accounts, Notes, Loans and Financing Receivable [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Accounts, Notes, Loans and Financing Receivable [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:to="lab_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_0c3dc39c-8a7a-4ff2-ae73-29aa9c85f6a7_terseLabel_en-US" xlink:label="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disposal Group Name [Domain]</link:label>
    <link:label id="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_label_en-US" xlink:label="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Disposal Group Name [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
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    <link:label id="lab_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_747e47a0-9d29-43ad-b253-3e2232eb7ee4_terseLabel_en-US" xlink:label="lab_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collateralized receivables, net</link:label>
    <link:label id="lab_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_label_en-US" xlink:label="lab_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mortgage Loans on Real Estate, Commercial and Consumer, Net</link:label>
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    <link:label id="lab_sui_EdgartonMember_c9249f3c-8d47-4417-9541-500f8e654fc2_terseLabel_en-US" xlink:label="lab_sui_EdgartonMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Edgarton</link:label>
    <link:label id="lab_sui_EdgartonMember_label_en-US" xlink:label="lab_sui_EdgartonMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Edgarton [Member]</link:label>
    <link:label id="lab_sui_EdgartonMember_documentation_en-US" xlink:label="lab_sui_EdgartonMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Edgarton</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_EdgartonMember" xlink:href="sui-20210630.xsd#sui_EdgartonMember"/>
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    <link:label id="lab_us-gaap_VariableInterestEntityLineItems_dd75034a-8bcf-46ff-ae7a-c2d39f9fc7e8_terseLabel_en-US" xlink:label="lab_us-gaap_VariableInterestEntityLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Interest Entity [Line Items]</link:label>
    <link:label id="lab_us-gaap_VariableInterestEntityLineItems_label_en-US" xlink:label="lab_us-gaap_VariableInterestEntityLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Interest Entity [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableInterestEntityLineItems" xlink:to="lab_us-gaap_VariableInterestEntityLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfEquityMethodInvestmentsTable_bfe2c306-89e5-4cdf-a777-2bd490a4a99a_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Equity Method Investments [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfEquityMethodInvestmentsTable_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Equity Method Investments [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="lab_us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_SafeHarborRybovichPortfolioMember_10be46df-b9f8-4e93-a61a-af2a50a3a030_terseLabel_en-US" xlink:label="lab_sui_SafeHarborRybovichPortfolioMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Safe Harbor Rybovich Portfolio</link:label>
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    <link:label id="lab_sui_SafeHarborRybovichPortfolioMember_documentation_en-US" xlink:label="lab_sui_SafeHarborRybovichPortfolioMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Safe Harbor Rybovich Portfolio</link:label>
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    <link:label id="lab_sui_BlueWaterMember_label_en-US" xlink:label="lab_sui_BlueWaterMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Blue Water [Member]</link:label>
    <link:label id="lab_sui_BlueWaterMember_documentation_en-US" xlink:label="lab_sui_BlueWaterMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Blue Water</link:label>
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    <link:label id="lab_sui_NetEarningsLossMember_ca76a193-76ad-404c-b06b-666a56eefbe4_terseLabel_en-US" xlink:label="lab_sui_NetEarningsLossMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net Earnings (Loss)</link:label>
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    <link:label id="lab_sui_NGSunWhitewaterMember_label_en-US" xlink:label="lab_sui_NGSunWhitewaterMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">NG Sun Whitewater [Member]</link:label>
    <link:label id="lab_sui_NGSunWhitewaterMember_documentation_en-US" xlink:label="lab_sui_NGSunWhitewaterMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">NG Sun Whitewater [Member]</link:label>
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    <link:label id="lab_sui_PreferredEquityMandatorilyRedeemableMember_d0d65dbd-46b0-4f79-9a6f-52f578269a6a_terseLabel_en-US" xlink:label="lab_sui_PreferredEquityMandatorilyRedeemableMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred Equity, Mandatorily Redeemable [Member]</link:label>
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    <link:label id="lab_sui_CollateralizedTermLoan3Member_28266276-c4dd-4871-a321-e328a54b9f7b_terseLabel_en-US" xlink:label="lab_sui_CollateralizedTermLoan3Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collateralized Term Loan 3</link:label>
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    <link:label id="lab_sui_CollateralizedTermLoan3Member_documentation_en-US" xlink:label="lab_sui_CollateralizedTermLoan3Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collateralized Term Loan 3</link:label>
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    <link:label id="lab_us-gaap_SeriesBPreferredStockMember_37153cd9-e063-4357-b419-8b319e214cfe_terseLabel_en-US" xlink:label="lab_us-gaap_SeriesBPreferredStockMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series B Preferred Stock [Member]</link:label>
    <link:label id="lab_us-gaap_SeriesBPreferredStockMember_label_en-US" xlink:label="lab_us-gaap_SeriesBPreferredStockMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series B Preferred Stock [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesBPreferredStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SeriesBPreferredStockMember"/>
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    <link:label id="lab_us-gaap_LiabilitiesAbstract_f3322ada-fe4a-4078-8dd4-1c1cddc4189d_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">LIABILITIES</link:label>
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    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_271c0374-5a5f-40c6-9457-a17c3a4c489b_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2022</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquireMarketableSecurities_a005d0ab-7f00-49ad-b9ee-6643446fac6f_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireMarketableSecurities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payments to acquire marketable securities</link:label>
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    <link:label id="lab_sui_SeriesA4PreferredStockMember_785cd61e-090d-4885-b9a5-60359769de8e_terseLabel_en-US" xlink:label="lab_sui_SeriesA4PreferredStockMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series A-4 Preferred Stock</link:label>
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    <link:label id="lab_sui_AwardDateFiveMember_777c9210-db80-444a-8875-a43fadd0391a_terseLabel_en-US" xlink:label="lab_sui_AwardDateFiveMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Award Date Five</link:label>
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    <link:label id="lab_us-gaap_FairValueInputsLevel2Member_edc2281f-a2eb-4765-b32f-0e22b8f3ba6c_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value, Inputs, Level 2</link:label>
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    <link:label id="lab_us-gaap_TypeOfAdoptionMember_35a50e21-8aa3-4f40-8296-51d248005a04_terseLabel_en-US" xlink:label="lab_us-gaap_TypeOfAdoptionMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Type of Adoption [Domain]</link:label>
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    <link:label id="lab_srt_ProductsAndServicesDomain_label_en-US" xlink:label="lab_srt_ProductsAndServicesDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Product and Service [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
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    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_2de3e847-c20a-4ca4-a268-3186eba7aa0f_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessor, Operating Lease, Payment to be Received, Year Two</link:label>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessor, Operating Lease, Payment to be Received, Year Two</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears"/>
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    <link:label id="lab_sui_TemporaryEquityIssuanceofEquityUnits_8614dc85-f0cd-4b02-bcdf-73a93dc78622_terseLabel_en-US" xlink:label="lab_sui_TemporaryEquityIssuanceofEquityUnits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Issuance of Series D preferred OP units</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_sui_TemporaryEquityIssuanceofEquityUnits" xlink:href="sui-20210630.xsd#sui_TemporaryEquityIssuanceofEquityUnits"/>
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    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_beba8e6f-386c-4a03-aba3-6f62bbba08ba_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument, Interest Rate, Stated Percentage</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
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    <link:label id="lab_us-gaap_GainLossOnSaleOfProperties_f285142a-42e3-4fb6-8ab0-19601f527766_terseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfProperties" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Gain on disposition of property</link:label>
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    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_5a833957-518f-4d5d-b04e-a8cf06ce652c_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessor, Operating Lease, Payment to be Received, after Year Five</link:label>
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    <link:label id="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_4158da3c-c138-4a1f-8759-1e2afa117aa8_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Less: Income attributable to noncontrolling interests</link:label>
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    <link:label id="lab_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_9d294096-2f80-4019-aaa7-0e2356e30936_terseLabel_en-US" xlink:label="lab_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Real Estate [Domain]</link:label>
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    <link:label id="lab_us-gaap_LeaseCostTableTextBlock_19ceabbd-d3de-4e20-9523-4f7d629afcde_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lease, Cost [Table Text Block]</link:label>
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    <link:label id="lab_sui_DavenportFloridaRVResortMember_b7031dd5-937b-4b3a-8512-e6e6d576f820_terseLabel_en-US" xlink:label="lab_sui_DavenportFloridaRVResortMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Davenport, Florida RV Resort</link:label>
    <link:label id="lab_sui_DavenportFloridaRVResortMember_label_en-US" xlink:label="lab_sui_DavenportFloridaRVResortMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Davenport, Florida RV Resort [Member]</link:label>
    <link:label id="lab_sui_DavenportFloridaRVResortMember_documentation_en-US" xlink:label="lab_sui_DavenportFloridaRVResortMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Davenport, Florida RV Resort</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_DavenportFloridaRVResortMember" xlink:href="sui-20210630.xsd#sui_DavenportFloridaRVResortMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_DavenportFloridaRVResortMember" xlink:to="lab_sui_DavenportFloridaRVResortMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_Acquisitions2020Member_fbda5692-8c21-4c52-a9a4-9039e51dfc4a_terseLabel_en-US" xlink:label="lab_sui_Acquisitions2020Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Acquisitions - 2020</link:label>
    <link:label id="lab_sui_Acquisitions2020Member_label_en-US" xlink:label="lab_sui_Acquisitions2020Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Acquisitions - 2020 [Member]</link:label>
    <link:label id="lab_sui_Acquisitions2020Member_documentation_en-US" xlink:label="lab_sui_Acquisitions2020Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Acquisitions - 2020 [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_Acquisitions2020Member" xlink:href="sui-20210630.xsd#sui_Acquisitions2020Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_Acquisitions2020Member" xlink:to="lab_sui_Acquisitions2020Member" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SaleOfStockPricePerShare_c19041f5-a21f-44a3-9323-fd96c6045f73_terseLabel_en-US" xlink:label="lab_us-gaap_SaleOfStockPricePerShare" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sale of Stock, Price Per Share</link:label>
    <link:label id="lab_us-gaap_SaleOfStockPricePerShare_label_en-US" xlink:label="lab_us-gaap_SaleOfStockPricePerShare" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sale of Stock, Price Per Share</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockPricePerShare"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SaleOfStockPricePerShare" xlink:to="lab_us-gaap_SaleOfStockPricePerShare" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtMember_caaa300e-8daf-4328-857d-58ba58791a55_terseLabel_en-US" xlink:label="lab_us-gaap_DebtMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt</link:label>
    <link:label id="lab_us-gaap_DebtMember_label_en-US" xlink:label="lab_us-gaap_DebtMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtMember" xlink:to="lab_us-gaap_DebtMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FinancialLiabilitiesFairValueDisclosure_77439aaa-50d8-4df7-bab7-bb4e917384a1_terseLabel_en-US" xlink:label="lab_us-gaap_FinancialLiabilitiesFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Liabilities Fair Value Disclosure</link:label>
    <link:label id="lab_us-gaap_FinancialLiabilitiesFairValueDisclosure_label_en-US" xlink:label="lab_us-gaap_FinancialLiabilitiesFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Liabilities Fair Value Disclosure</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialLiabilitiesFairValueDisclosure" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinancialLiabilitiesFairValueDisclosure"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinancialLiabilitiesFairValueDisclosure" xlink:to="lab_us-gaap_FinancialLiabilitiesFairValueDisclosure" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_MergersAcquisitionsAndDispositionsDisclosuresTextBlock_6629888d-88bb-4573-a400-03eb41ebedd8_terseLabel_en-US" xlink:label="lab_us-gaap_MergersAcquisitionsAndDispositionsDisclosuresTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Real Estate Acquisitions</link:label>
    <link:label id="lab_us-gaap_MergersAcquisitionsAndDispositionsDisclosuresTextBlock_label_en-US" xlink:label="lab_us-gaap_MergersAcquisitionsAndDispositionsDisclosuresTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mergers, Acquisitions and Dispositions Disclosures [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MergersAcquisitionsAndDispositionsDisclosuresTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MergersAcquisitionsAndDispositionsDisclosuresTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MergersAcquisitionsAndDispositionsDisclosuresTextBlock" xlink:to="lab_us-gaap_MergersAcquisitionsAndDispositionsDisclosuresTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_InsuranceReceivables_a5f92dce-7cd5-4c71-8782-8c5ba73c4bc7_terseLabel_en-US" xlink:label="lab_sui_InsuranceReceivables" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Insurance receivables</link:label>
    <link:label id="lab_sui_InsuranceReceivables_label_en-US" xlink:label="lab_sui_InsuranceReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Insurance receivables</link:label>
    <link:label id="lab_sui_InsuranceReceivables_documentation_en-US" xlink:label="lab_sui_InsuranceReceivables" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Insurance receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_InsuranceReceivables" xlink:href="sui-20210630.xsd#sui_InsuranceReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_InsuranceReceivables" xlink:to="lab_sui_InsuranceReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SubsequentEventsTextBlock_d77c8c61-2f7f-4488-b5ec-e47beb2b8642_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventsTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsequent Events</link:label>
    <link:label id="lab_us-gaap_SubsequentEventsTextBlock_label_en-US" xlink:label="lab_us-gaap_SubsequentEventsTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsequent Events [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventsTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventsTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventsTextBlock" xlink:to="lab_us-gaap_SubsequentEventsTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_6c875bb4-ad4a-48c1-a476-eb89ba9b938f_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net Cash Provided By Financing Activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_InstallmentNotesReceivableOnManufacturedHomesGrossMember_b0988562-3341-47e4-9972-52e4d7e50ea8_terseLabel_en-US" xlink:label="lab_sui_InstallmentNotesReceivableOnManufacturedHomesGrossMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Installment notes receivable on manufactured homes, gross</link:label>
    <link:label id="lab_sui_InstallmentNotesReceivableOnManufacturedHomesGrossMember_label_en-US" xlink:label="lab_sui_InstallmentNotesReceivableOnManufacturedHomesGrossMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Installment notes receivable on manufactured homes, gross [Member]</link:label>
    <link:label id="lab_sui_InstallmentNotesReceivableOnManufacturedHomesGrossMember_documentation_en-US" xlink:label="lab_sui_InstallmentNotesReceivableOnManufacturedHomesGrossMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Installment notes receivable on manufactured homes, gross [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_InstallmentNotesReceivableOnManufacturedHomesGrossMember" xlink:href="sui-20210630.xsd#sui_InstallmentNotesReceivableOnManufacturedHomesGrossMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_InstallmentNotesReceivableOnManufacturedHomesGrossMember" xlink:to="lab_sui_InstallmentNotesReceivableOnManufacturedHomesGrossMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_2a522939-09e1-4e94-aaa5-a4f530dc895f_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_MarathonMarinaMember_8d34cdeb-4eb7-4f8f-958f-377955d37be9_terseLabel_en-US" xlink:label="lab_sui_MarathonMarinaMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Marathon Marina</link:label>
    <link:label id="lab_sui_MarathonMarinaMember_label_en-US" xlink:label="lab_sui_MarathonMarinaMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Marathon Marina [Member]</link:label>
    <link:label id="lab_sui_MarathonMarinaMember_documentation_en-US" xlink:label="lab_sui_MarathonMarinaMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Marathon Marina</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_MarathonMarinaMember" xlink:href="sui-20210630.xsd#sui_MarathonMarinaMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_MarathonMarinaMember" xlink:to="lab_sui_MarathonMarinaMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates_e4d2d4a7-bdf4-45ed-a422-6c25274f0b4e_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Distributions from nonconsolidated affiliates</link:label>
    <link:label id="lab_us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates_label_en-US" xlink:label="lab_us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from Divestiture of Interest in Subsidiaries and Affiliates</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates" xlink:to="lab_us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncomeLossFromEquityMethodInvestments_4b993e9b-16a1-46d2-863a-82fdfb288830_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromEquityMethodInvestments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income (Loss) from Equity Method Investments</link:label>
    <link:label id="lab_us-gaap_IncomeLossFromEquityMethodInvestments_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromEquityMethodInvestments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income (Loss) from Equity Method Investments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeLossFromEquityMethodInvestments" xlink:to="lab_us-gaap_IncomeLossFromEquityMethodInvestments" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_TransferToLevel3Member_4f795e46-d6ea-4c29-8af5-cd8b619ce4d0_terseLabel_en-US" xlink:label="lab_sui_TransferToLevel3Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Transfer to Level 3</link:label>
    <link:label id="lab_sui_TransferToLevel3Member_label_en-US" xlink:label="lab_sui_TransferToLevel3Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Transfer to Level 3 [Member]</link:label>
    <link:label id="lab_sui_TransferToLevel3Member_documentation_en-US" xlink:label="lab_sui_TransferToLevel3Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Transfer to Level 3</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_TransferToLevel3Member" xlink:href="sui-20210630.xsd#sui_TransferToLevel3Member"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_TransferToLevel3Member" xlink:to="lab_sui_TransferToLevel3Member" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OtherCostAndExpenseOperating_756c7898-e408-4132-bfe7-486234445efe_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCostAndExpenseOperating" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Service, retail, dining and entertainment</link:label>
    <link:label id="lab_us-gaap_OtherCostAndExpenseOperating_label_en-US" xlink:label="lab_us-gaap_OtherCostAndExpenseOperating" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Cost and Expense, Operating</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherCostAndExpenseOperating" xlink:to="lab_us-gaap_OtherCostAndExpenseOperating" xlink:type="arc" order="1"/>
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    <link:label id="lab_sui_SaleOfStockNumberOfSharesIssuedInTransactionDirect_label_en-US" xlink:label="lab_sui_SaleOfStockNumberOfSharesIssuedInTransactionDirect" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sale of Stock, Number of Shares Issued in Transaction, Direct</link:label>
    <link:label id="lab_sui_SaleOfStockNumberOfSharesIssuedInTransactionDirect_documentation_en-US" xlink:label="lab_sui_SaleOfStockNumberOfSharesIssuedInTransactionDirect" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sale of Stock, Number of Shares Issued in Transaction, Direct</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_SaleOfStockNumberOfSharesIssuedInTransactionDirect" xlink:href="sui-20210630.xsd#sui_SaleOfStockNumberOfSharesIssuedInTransactionDirect"/>
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    <link:label id="lab_sui_MouseMountainMember_label_en-US" xlink:label="lab_sui_MouseMountainMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mouse Mountain [Member]</link:label>
    <link:label id="lab_sui_MouseMountainMember_documentation_en-US" xlink:label="lab_sui_MouseMountainMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Mouse Mountain</link:label>
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    <link:label id="lab_sui_SeriesB3PreferredOPUnitsMember_ff89361b-dd7a-4b22-8c83-fbd6dbeb4406_terseLabel_en-US" xlink:label="lab_sui_SeriesB3PreferredOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series B-3 Preferred OP Units [Member]</link:label>
    <link:label id="lab_sui_SeriesB3PreferredOPUnitsMember_label_en-US" xlink:label="lab_sui_SeriesB3PreferredOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series B-3 Preferred OP Units [Member]</link:label>
    <link:label id="lab_sui_SeriesB3PreferredOPUnitsMember_documentation_en-US" xlink:label="lab_sui_SeriesB3PreferredOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series B-3 Preferred OP Units [Member]</link:label>
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    <link:label id="lab_us-gaap_LeasesAbstract_de7d2b4f-5b14-4920-b063-80f2d0f1e6e4_terseLabel_en-US" xlink:label="lab_us-gaap_LeasesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leases [Abstract]</link:label>
    <link:label id="lab_us-gaap_LeasesAbstract_label_en-US" xlink:label="lab_us-gaap_LeasesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leases [Abstract]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationAllowanceByDeferredTaxAssetAxis"/>
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    <link:label id="lab_us-gaap_AwardDateAxis_e8eda52b-bf3b-4180-9349-295d501e5cc2_terseLabel_en-US" xlink:label="lab_us-gaap_AwardDateAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Award Date [Axis]</link:label>
    <link:label id="lab_us-gaap_AwardDateAxis_label_en-US" xlink:label="lab_us-gaap_AwardDateAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Award Date [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardDateAxis"/>
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    <link:label id="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_5ccc415b-cd72-4817-8320-90cbb873828d_terseLabel_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">London Interbank Offered Rate (LIBOR) [Member]</link:label>
    <link:label id="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_label_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">London Interbank Offered Rate (LIBOR) [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember"/>
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    <link:label id="lab_sui_LakeviewMobileEstatesMember_664e2bf9-d112-48de-b68a-e1213152e19e_terseLabel_en-US" xlink:label="lab_sui_LakeviewMobileEstatesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lakeview Mobile Estates</link:label>
    <link:label id="lab_sui_LakeviewMobileEstatesMember_label_en-US" xlink:label="lab_sui_LakeviewMobileEstatesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lakeview Mobile Estates [Member]</link:label>
    <link:label id="lab_sui_LakeviewMobileEstatesMember_documentation_en-US" xlink:label="lab_sui_LakeviewMobileEstatesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lakeview Mobile Estates</link:label>
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    <link:label id="lab_sui_SafeHarborMearsAnnapolisMember_2fde1b78-c14e-48b3-bdfe-61fe8fb2aafd_terseLabel_en-US" xlink:label="lab_sui_SafeHarborMearsAnnapolisMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Safe Harbor Mears Annapolis</link:label>
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    <link:label id="lab_sui_SafeHarborMearsAnnapolisMember_documentation_en-US" xlink:label="lab_sui_SafeHarborMearsAnnapolisMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Safe Harbor Mears Annapolis</link:label>
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    <link:label id="lab_sui_CollateralizedTermLoan2Member_539c0f8e-c30c-46cc-9387-24206200b9c6_terseLabel_en-US" xlink:label="lab_sui_CollateralizedTermLoan2Member" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collateralized Term Loan 2</link:label>
    <link:label id="lab_sui_CollateralizedTermLoan2Member_label_en-US" xlink:label="lab_sui_CollateralizedTermLoan2Member" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collateralized Term Loan 2 [Member]</link:label>
    <link:label id="lab_sui_CollateralizedTermLoan2Member_documentation_en-US" xlink:label="lab_sui_CollateralizedTermLoan2Member" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collateralized Term Loan 2</link:label>
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    <link:label id="lab_us-gaap_InterestExpenseOther_9e85b8a2-af18-4ffa-82cb-1505be1d3861_terseLabel_en-US" xlink:label="lab_us-gaap_InterestExpenseOther" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest on mandatorily redeemable preferred OP units / equity</link:label>
    <link:label id="lab_us-gaap_InterestExpenseOther_d2b451c6-a08d-43b5-a3a1-bde9163a9903_negatedLabel_en-US" xlink:label="lab_us-gaap_InterestExpenseOther" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest on mandatorily redeemable preferred OP units / equity</link:label>
    <link:label id="lab_us-gaap_InterestExpenseOther_label_en-US" xlink:label="lab_us-gaap_InterestExpenseOther" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Interest Expense, Other</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOther" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestExpenseOther"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestExpenseOther" xlink:to="lab_us-gaap_InterestExpenseOther" xlink:type="arc" order="1"/>
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    <link:label id="lab_us-gaap_SellingExpense_b2972c47-0a33-408c-b57d-3e8578fe6f24_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_SellingExpense" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Home selling expenses</link:label>
    <link:label id="lab_us-gaap_SellingExpense_label_en-US" xlink:label="lab_us-gaap_SellingExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Selling Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingExpense"/>
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    <link:label id="lab_sui_FinancialAssetsFairValueDisclosure_4e00544c-0242-4652-8d50-f5e4db61c353_terseLabel_en-US" xlink:label="lab_sui_FinancialAssetsFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Assets Fair Value Disclosure</link:label>
    <link:label id="lab_sui_FinancialAssetsFairValueDisclosure_label_en-US" xlink:label="lab_sui_FinancialAssetsFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Assets Fair Value Disclosure</link:label>
    <link:label id="lab_sui_FinancialAssetsFairValueDisclosure_documentation_en-US" xlink:label="lab_sui_FinancialAssetsFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Assets Fair Value Disclosure</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_FinancialAssetsFairValueDisclosure" xlink:href="sui-20210630.xsd#sui_FinancialAssetsFairValueDisclosure"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_FinancialAssetsFairValueDisclosure" xlink:to="lab_sui_FinancialAssetsFairValueDisclosure" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment_50d4b950-b031-46d7-acc8-409b92009b99_terseLabel_en-US" xlink:label="lab_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Direct Costs of Leased and Rented Property or Equipment</link:label>
    <link:label id="lab_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment_label_en-US" xlink:label="lab_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Direct Costs of Leased and Rented Property or Equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment" xlink:to="lab_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_SalesAndSettlementsMember_fe75cb5b-e371-408b-b426-d047e0052479_terseLabel_en-US" xlink:label="lab_sui_SalesAndSettlementsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sales and Settlements</link:label>
    <link:label id="lab_sui_SalesAndSettlementsMember_label_en-US" xlink:label="lab_sui_SalesAndSettlementsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sales and Settlements [Member]</link:label>
    <link:label id="lab_sui_SalesAndSettlementsMember_documentation_en-US" xlink:label="lab_sui_SalesAndSettlementsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sales and Settlements</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_SalesAndSettlementsMember" xlink:href="sui-20210630.xsd#sui_SalesAndSettlementsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_SalesAndSettlementsMember" xlink:to="lab_sui_SalesAndSettlementsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_NotesduefromRealEstateDevelopersMember_b70e0353-8bb9-49d3-9fb7-80d451004f83_terseLabel_en-US" xlink:label="lab_sui_NotesduefromRealEstateDevelopersMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes receivable from real estate developers</link:label>
    <link:label id="lab_sui_NotesduefromRealEstateDevelopersMember_label_en-US" xlink:label="lab_sui_NotesduefromRealEstateDevelopersMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes due from Real Estate Developers [Member]</link:label>
    <link:label id="lab_sui_NotesduefromRealEstateDevelopersMember_documentation_en-US" xlink:label="lab_sui_NotesduefromRealEstateDevelopersMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes due from Real Estate Developers [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_NotesduefromRealEstateDevelopersMember" xlink:href="sui-20210630.xsd#sui_NotesduefromRealEstateDevelopersMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_NotesduefromRealEstateDevelopersMember" xlink:to="lab_sui_NotesduefromRealEstateDevelopersMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_TemporaryEquityAccretionToRedemptionValue_6b93a96a-aa6b-4ff8-bf24-5df069432910_terseLabel_en-US" xlink:label="lab_us-gaap_TemporaryEquityAccretionToRedemptionValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Interests</link:label>
    <link:label id="lab_us-gaap_TemporaryEquityAccretionToRedemptionValue_label_en-US" xlink:label="lab_us-gaap_TemporaryEquityAccretionToRedemptionValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary Equity, Accretion to Redemption Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityAccretionToRedemptionValue" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityAccretionToRedemptionValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TemporaryEquityAccretionToRedemptionValue" xlink:to="lab_us-gaap_TemporaryEquityAccretionToRedemptionValue" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LossContingenciesTable_120d7dff-d4c7-4fd0-aefb-7d81ec2858e1_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingenciesTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loss Contingencies [Table]</link:label>
    <link:label id="lab_us-gaap_LossContingenciesTable_label_en-US" xlink:label="lab_us-gaap_LossContingenciesTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loss Contingencies [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingenciesTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossContingenciesTable" xlink:to="lab_us-gaap_LossContingenciesTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_35505c61-676c-4aa2-9ffd-fb0b06a1c953_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Real property</link:label>
    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue from Contract with Customer, Including Assessed Tax</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax" xlink:to="lab_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressPostalZipCode_22a07728-2522-4799-b657-bc23866fe124_terseLabel_en-US" xlink:label="lab_dei_EntityAddressPostalZipCode" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Postal Zip Code</link:label>
    <link:label id="lab_dei_EntityAddressPostalZipCode_label_en-US" xlink:label="lab_dei_EntityAddressPostalZipCode" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Postal Zip Code</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressPostalZipCode"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressPostalZipCode" xlink:to="lab_dei_EntityAddressPostalZipCode" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NotesReceivableGross_80200c36-d02e-4ff9-aa5a-3350b659becd_periodStartLabel_en-US" xlink:label="lab_us-gaap_NotesReceivableGross" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Beginning balance</link:label>
    <link:label id="lab_us-gaap_NotesReceivableGross_cad1d363-4743-48df-90d8-2de23d25b784_periodEndLabel_en-US" xlink:label="lab_us-gaap_NotesReceivableGross" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Ending balance</link:label>
    <link:label id="lab_us-gaap_NotesReceivableGross_label_en-US" xlink:label="lab_us-gaap_NotesReceivableGross" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financing Receivable, before Allowance for Credit Loss</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NotesReceivableGross"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NotesReceivableGross" xlink:to="lab_us-gaap_NotesReceivableGross" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ContractWithCustomerAssetReclassifiedToReceivable_8b8c86a5-cb0f-4313-80f9-11463b345a72_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetReclassifiedToReceivable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contract with Customer, Asset, Reclassified to Receivable</link:label>
    <link:label id="lab_us-gaap_ContractWithCustomerAssetReclassifiedToReceivable_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetReclassifiedToReceivable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contract with Customer, Asset, Reclassified to Receivable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetReclassifiedToReceivable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerAssetReclassifiedToReceivable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerAssetReclassifiedToReceivable" xlink:to="lab_us-gaap_ContractWithCustomerAssetReclassifiedToReceivable" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_Security12bTitle_c829e3f4-4025-4ba5-8126-ec2d53b72e68_terseLabel_en-US" xlink:label="lab_dei_Security12bTitle" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Title of 12(b) Security</link:label>
    <link:label id="lab_dei_Security12bTitle_label_en-US" xlink:label="lab_dei_Security12bTitle" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Title of 12(b) Security</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_Security12bTitle"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_Security12bTitle" xlink:to="lab_dei_Security12bTitle" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_GTSCMember_5631cb05-87e8-4d52-a1a2-d32e3670a836_terseLabel_en-US" xlink:label="lab_sui_GTSCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">GTSC [Member]</link:label>
    <link:label id="lab_sui_GTSCMember_label_en-US" xlink:label="lab_sui_GTSCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">GTSC [Member]</link:label>
    <link:label id="lab_sui_GTSCMember_documentation_en-US" xlink:label="lab_sui_GTSCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">GTSC [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_GTSCMember" xlink:href="sui-20210630.xsd#sui_GTSCMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_GTSCMember" xlink:to="lab_sui_GTSCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_VariableInterestEntityEquityInterestsIssued_60069ed3-a22f-4b26-a3c2-1054df7b2000_negatedTerseLabel_en-US" xlink:label="lab_sui_VariableInterestEntityEquityInterestsIssued" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity interests</link:label>
    <link:label id="lab_sui_VariableInterestEntityEquityInterestsIssued_09ec272d-1265-4a2d-9f35-9da7a0c40aa0_terseLabel_en-US" xlink:label="lab_sui_VariableInterestEntityEquityInterestsIssued" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Interest Entity, Equity Interests Issued</link:label>
    <link:label id="lab_sui_VariableInterestEntityEquityInterestsIssued_label_en-US" xlink:label="lab_sui_VariableInterestEntityEquityInterestsIssued" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Interest Entity, Equity Interests Issued</link:label>
    <link:label id="lab_sui_VariableInterestEntityEquityInterestsIssued_documentation_en-US" xlink:label="lab_sui_VariableInterestEntityEquityInterestsIssued" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Interest Entity, Equity Interests Issued</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_VariableInterestEntityEquityInterestsIssued" xlink:href="sui-20210630.xsd#sui_VariableInterestEntityEquityInterestsIssued"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_VariableInterestEntityEquityInterestsIssued" xlink:to="lab_sui_VariableInterestEntityEquityInterestsIssued" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StatementTable_3b6e6a5d-e7f8-4572-862f-9de5c9180751_terseLabel_en-US" xlink:label="lab_us-gaap_StatementTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statement [Table]</link:label>
    <link:label id="lab_us-gaap_StatementTable_label_en-US" xlink:label="lab_us-gaap_StatementTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statement [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementTable" xlink:to="lab_us-gaap_StatementTable" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_AwardDateSixMember_50d04260-6394-4415-8be8-32e22ffca34e_terseLabel_en-US" xlink:label="lab_sui_AwardDateSixMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Award Date Six</link:label>
    <link:label id="lab_sui_AwardDateSixMember_label_en-US" xlink:label="lab_sui_AwardDateSixMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Award Date Six [Member]</link:label>
    <link:label id="lab_sui_AwardDateSixMember_documentation_en-US" xlink:label="lab_sui_AwardDateSixMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Award Date Six</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_AwardDateSixMember" xlink:href="sui-20210630.xsd#sui_AwardDateSixMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_AwardDateSixMember" xlink:to="lab_sui_AwardDateSixMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_NumberOfStorageSpaces_9cc2d4bf-b21b-4d14-9e93-49b035e138cb_terseLabel_en-US" xlink:label="lab_sui_NumberOfStorageSpaces" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of storage spaces (in storage spaces)</link:label>
    <link:label id="lab_sui_NumberOfStorageSpaces_label_en-US" xlink:label="lab_sui_NumberOfStorageSpaces" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Storage Spaces</link:label>
    <link:label id="lab_sui_NumberOfStorageSpaces_documentation_en-US" xlink:label="lab_sui_NumberOfStorageSpaces" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Storage Spaces</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_NumberOfStorageSpaces" xlink:href="sui-20210630.xsd#sui_NumberOfStorageSpaces"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_NumberOfStorageSpaces" xlink:to="lab_sui_NumberOfStorageSpaces" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_SaleOfStockNumberOfSharesIssuedInTransactionForwardEquitySales_f774c753-a8b1-43d3-ae27-b7a633bc3c5e_terseLabel_en-US" xlink:label="lab_sui_SaleOfStockNumberOfSharesIssuedInTransactionForwardEquitySales" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sale of Stock, Number of Shares Issued in Transaction, Forward Equity Sales</link:label>
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    <link:label id="lab_sui_SaleOfStockNumberOfSharesIssuedInTransactionForwardEquitySales_documentation_en-US" xlink:label="lab_sui_SaleOfStockNumberOfSharesIssuedInTransactionForwardEquitySales" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sale of Stock, Number of Shares Issued in Transaction, Forward Equity Sales</link:label>
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    <link:label id="lab_srt_RangeAxis_39b48259-0b53-41be-9e72-ae53940bac78_terseLabel_en-US" xlink:label="lab_srt_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statistical Measurement [Axis]</link:label>
    <link:label id="lab_srt_RangeAxis_label_en-US" xlink:label="lab_srt_RangeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statistical Measurement [Axis]</link:label>
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    <link:label id="lab_sui_CountryVillageMember_410a0650-8d66-4ec5-874a-4a4af9f45628_terseLabel_en-US" xlink:label="lab_sui_CountryVillageMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Country Village Estates</link:label>
    <link:label id="lab_sui_CountryVillageMember_label_en-US" xlink:label="lab_sui_CountryVillageMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Country Village [Member]</link:label>
    <link:label id="lab_sui_CountryVillageMember_documentation_en-US" xlink:label="lab_sui_CountryVillageMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Country Village [Member]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_ForestSpringsMember" xlink:to="lab_sui_ForestSpringsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SubsequentEventMember_d03e055d-473b-4c3b-9dd6-c54368414ed4_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsequent Event [Member]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventMember" xlink:to="lab_us-gaap_SubsequentEventMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CoverAbstract_147ab834-afcf-43d1-bb6f-9c9a4f09ed3b_terseLabel_en-US" xlink:label="lab_dei_CoverAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cover [Abstract]</link:label>
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    <link:label id="lab_sui_HendersonRVCommunityMember_06f86660-a887-49bf-80c4-f56bdb18abae_terseLabel_en-US" xlink:label="lab_sui_HendersonRVCommunityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Henderson RV Community</link:label>
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    <link:label id="lab_sui_HendersonRVCommunityMember_documentation_en-US" xlink:label="lab_sui_HendersonRVCommunityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Henderson RV Community</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_HendersonRVCommunityMember" xlink:to="lab_sui_HendersonRVCommunityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_Goodwill_7ad6a9ee-349f-48cd-ad57-33600e3519c4_terseLabel_en-US" xlink:label="lab_us-gaap_Goodwill" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Goodwill</link:label>
    <link:label id="lab_us-gaap_Goodwill_label_en-US" xlink:label="lab_us-gaap_Goodwill" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Goodwill</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Goodwill" xlink:to="lab_us-gaap_Goodwill" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_InventoryFinishedHomes_6d60809a-9fa4-419a-a59d-cbb852e80160_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryFinishedHomes" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Inventory of manufactured homes</link:label>
    <link:label id="lab_us-gaap_InventoryFinishedHomes_0fedeb35-c0a3-4cf0-b2f4-29dbb174ae37_verboseLabel_en-US" xlink:label="lab_us-gaap_InventoryFinishedHomes" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Inventory of manufactured homes</link:label>
    <link:label id="lab_us-gaap_InventoryFinishedHomes_label_en-US" xlink:label="lab_us-gaap_InventoryFinishedHomes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Inventory, Finished Homes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryFinishedHomes" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryFinishedHomes"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryFinishedHomes" xlink:to="lab_us-gaap_InventoryFinishedHomes" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_MarinaSaleSegmentMember_5c691af5-e290-4bd1-830a-1736f0b6f812_terseLabel_en-US" xlink:label="lab_sui_MarinaSaleSegmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Marina Sale Segment</link:label>
    <link:label id="lab_sui_MarinaSaleSegmentMember_label_en-US" xlink:label="lab_sui_MarinaSaleSegmentMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Marina Sale Segment [Member]</link:label>
    <link:label id="lab_sui_MarinaSaleSegmentMember_documentation_en-US" xlink:label="lab_sui_MarinaSaleSegmentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Marina Sale Segment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_MarinaSaleSegmentMember" xlink:href="sui-20210630.xsd#sui_MarinaSaleSegmentMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_MarinaSaleSegmentMember" xlink:to="lab_sui_MarinaSaleSegmentMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_MinorityInterest_3da38676-cae7-430f-82e1-62403d7b41b9_totalLabel_en-US" xlink:label="lab_us-gaap_MinorityInterest" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total noncontrolling interests</link:label>
    <link:label id="lab_us-gaap_MinorityInterest_label_en-US" xlink:label="lab_us-gaap_MinorityInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stockholders' Equity Attributable to Noncontrolling Interest</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MinorityInterest" xlink:to="lab_us-gaap_MinorityInterest" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_EquityMethodInvestmentAdjustmentAllowanceforLosses_eaa7618c-451e-481c-b69c-e06e401c44be_terseLabel_en-US" xlink:label="lab_sui_EquityMethodInvestmentAdjustmentAllowanceforLosses" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Method Investment, Adjustment, Allowance for Losses</link:label>
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    <link:label id="lab_sui_EquityMethodInvestmentAdjustmentAllowanceforLosses_documentation_en-US" xlink:label="lab_sui_EquityMethodInvestmentAdjustmentAllowanceforLosses" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Method Investment, Adjustment, Allowance for Losses</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_EquityMethodInvestmentAdjustmentAllowanceforLosses" xlink:href="sui-20210630.xsd#sui_EquityMethodInvestmentAdjustmentAllowanceforLosses"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_EquityMethodInvestmentAdjustmentAllowanceforLosses" xlink:to="lab_sui_EquityMethodInvestmentAdjustmentAllowanceforLosses" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_OperatingAndFinanceLeasesLiabilityPaymentsDueYearFive_0bf2af56-2b31-436a-bbaf-397d49fb8428_terseLabel_en-US" xlink:label="lab_sui_OperatingAndFinanceLeasesLiabilityPaymentsDueYearFive" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating And Finance Leases, Liability, Payments, Due Year Five</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_sui_OperatingAndFinanceLeasesLiabilityPaymentsDueYearFive" xlink:href="sui-20210630.xsd#sui_OperatingAndFinanceLeasesLiabilityPaymentsDueYearFive"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_OperatingAndFinanceLeasesLiabilityPaymentsDueYearFive" xlink:to="lab_sui_OperatingAndFinanceLeasesLiabilityPaymentsDueYearFive" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FranchiseRightsMember_dacf8884-211b-4657-8cd5-7cd6dd741f12_terseLabel_en-US" xlink:label="lab_us-gaap_FranchiseRightsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Franchise Rights [Member]</link:label>
    <link:label id="lab_us-gaap_FranchiseRightsMember_label_en-US" xlink:label="lab_us-gaap_FranchiseRightsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Franchise Rights [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchiseRightsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FranchiseRightsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FranchiseRightsMember" xlink:to="lab_us-gaap_FranchiseRightsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsPercentExpectedToVest_36e0648d-8de9-46aa-9c05-28b2d773ae6d_terseLabel_en-US" xlink:label="lab_sui_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsPercentExpectedToVest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based Compensation Arrangement By Share-based Payment Award, Fair Value Assumptions, Percent Expected To Vest</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsPercentExpectedToVest" xlink:to="lab_sui_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsPercentExpectedToVest" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_SeriesDPreferredOPUnitsMember_0bee4c4a-766b-4fac-9739-2108ce90fafc_terseLabel_en-US" xlink:label="lab_sui_SeriesDPreferredOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series D Preferred OP Units</link:label>
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    <link:label id="lab_sui_SeriesDPreferredOPUnitsMember_documentation_en-US" xlink:label="lab_sui_SeriesDPreferredOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series D Preferred OP Units [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_SeriesDPreferredOPUnitsMember" xlink:href="sui-20210630.xsd#sui_SeriesDPreferredOPUnitsMember"/>
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    <link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Fair Value Hierarchy and NAV [Domain]</link:label>
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    <link:label id="lab_dei_EntityEmergingGrowthCompany_9615b5dc-c7bf-47d6-8a42-a1da2f636911_terseLabel_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Emerging Growth Company</link:label>
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    <link:label id="lab_sui_MHMember_documentation_en-US" xlink:label="lab_sui_MHMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">MH</link:label>
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    <link:label id="lab_sui_MaturesMarch1andApril120206.24PercentInterestRateMember_6a700c7f-5115-4b6c-b39c-614b4a2078b9_terseLabel_en-US" xlink:label="lab_sui_MaturesMarch1andApril120206.24PercentInterestRateMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Matures March 1 and April 1, 2020, 6.24 Percent Interest Rate [Member]</link:label>
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    <link:label id="lab_srt_RangeMember_d4dd2aa5-1bca-4971-9cac-e693c033ee3c_terseLabel_en-US" xlink:label="lab_srt_RangeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statistical Measurement [Domain]</link:label>
    <link:label id="lab_srt_RangeMember_label_en-US" xlink:label="lab_srt_RangeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Statistical Measurement [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RangeMember" xlink:to="lab_srt_RangeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressAddressLine1_6b7ebdbb-f8cd-4183-8572-7f84a4ad47da_terseLabel_en-US" xlink:label="lab_dei_EntityAddressAddressLine1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Address Line One</link:label>
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    <link:label id="lab_dei_EntityAddressAddressLine2_a56625de-463e-4208-9af7-f42af667806e_terseLabel_en-US" xlink:label="lab_dei_EntityAddressAddressLine2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Address Line Two</link:label>
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    <link:label id="lab_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_7363df80-f943-4382-8b57-af7fb12f83f4_terseLabel_en-US" xlink:label="lab_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consideration received</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_08c29fd6-7f8a-4bec-bdad-97c9b12340b7_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from dispositions of assets and depreciated homes, net</link:label>
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    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerAbstract_541cfdbb-ce49-484c-a9b1-aa4349f9666e_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue from Contract with Customer [Abstract]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityFilerCategory"/>
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    <link:label id="lab_us-gaap_ConversionOfStockTable_79ae190c-a253-4f3e-b174-ebc8001c7177_terseLabel_en-US" xlink:label="lab_us-gaap_ConversionOfStockTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of Stock [Table]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockTable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConversionOfStockTable"/>
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    <link:loc xlink:type="locator" xlink:label="loc_sui_NumberOfCollateralizedTermLoans" xlink:href="sui-20210630.xsd#sui_NumberOfCollateralizedTermLoans"/>
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    <link:label id="lab_us-gaap_TemporaryEquitySharesOutstanding_f657bfbd-bf99-4f7c-aa46-d45a3e96a40e_verboseLabel_en-US" xlink:label="lab_us-gaap_TemporaryEquitySharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Shares outstanding (in shares)</link:label>
    <link:label id="lab_us-gaap_TemporaryEquitySharesOutstanding_9fad2163-38e5-470f-8a15-4cf32eb88784_terseLabel_en-US" xlink:label="lab_us-gaap_TemporaryEquitySharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary Equity, Shares Outstanding</link:label>
    <link:label id="lab_us-gaap_TemporaryEquitySharesOutstanding_label_en-US" xlink:label="lab_us-gaap_TemporaryEquitySharesOutstanding" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary Equity, Shares Outstanding</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesOutstanding" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquitySharesOutstanding"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TemporaryEquitySharesOutstanding" xlink:to="lab_us-gaap_TemporaryEquitySharesOutstanding" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_ThemeworldRVMember_da7140cc-e08c-4eaf-8f07-a853f09bb9b8_terseLabel_en-US" xlink:label="lab_sui_ThemeworldRVMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Themeworld RV</link:label>
    <link:label id="lab_sui_ThemeworldRVMember_label_en-US" xlink:label="lab_sui_ThemeworldRVMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Themeworld RV [Member]</link:label>
    <link:label id="lab_sui_ThemeworldRVMember_documentation_en-US" xlink:label="lab_sui_ThemeworldRVMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Themeworld RV</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_ThemeworldRVMember" xlink:href="sui-20210630.xsd#sui_ThemeworldRVMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_ThemeworldRVMember" xlink:to="lab_sui_ThemeworldRVMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_LongTermDebtExcludingSecuredBorrowingsFairValueDisclosure_fa0a8f4c-998d-4aa2-951d-328e57e63be7_terseLabel_en-US" xlink:label="lab_sui_LongTermDebtExcludingSecuredBorrowingsFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt (excluding secured borrowings)</link:label>
    <link:label id="lab_sui_LongTermDebtExcludingSecuredBorrowingsFairValueDisclosure_label_en-US" xlink:label="lab_sui_LongTermDebtExcludingSecuredBorrowingsFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long term debt excluding secured borrowings, Fair Value Disclosure</link:label>
    <link:label id="lab_sui_LongTermDebtExcludingSecuredBorrowingsFairValueDisclosure_documentation_en-US" xlink:label="lab_sui_LongTermDebtExcludingSecuredBorrowingsFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long term debt excluding secured borrowings, Fair Value Disclosure</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_LongTermDebtExcludingSecuredBorrowingsFairValueDisclosure" xlink:href="sui-20210630.xsd#sui_LongTermDebtExcludingSecuredBorrowingsFairValueDisclosure"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_LongTermDebtExcludingSecuredBorrowingsFairValueDisclosure" xlink:to="lab_sui_LongTermDebtExcludingSecuredBorrowingsFairValueDisclosure" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_StatementBusinessSegmentsAxis_8ae4355a-faa3-4c1b-b854-e99ce5206516_terseLabel_en-US" xlink:label="lab_us-gaap_StatementBusinessSegmentsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Segments [Axis]</link:label>
    <link:label id="lab_us-gaap_StatementBusinessSegmentsAxis_label_en-US" xlink:label="lab_us-gaap_StatementBusinessSegmentsAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Segments [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis" xlink:to="lab_us-gaap_StatementBusinessSegmentsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_NoncontrollingInterestInVariableInterestEntity_4f9840fc-b988-4354-a0d8-c3c37d4e056e_terseLabel_en-US" xlink:label="lab_us-gaap_NoncontrollingInterestInVariableInterestEntity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consolidated VIEs (fully attributable to consolidated VIEs; see Note 7)</link:label>
    <link:label id="lab_us-gaap_NoncontrollingInterestInVariableInterestEntity_label_en-US" xlink:label="lab_us-gaap_NoncontrollingInterestInVariableInterestEntity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Noncontrolling Interest in Variable Interest Entity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestInVariableInterestEntity" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncontrollingInterestInVariableInterestEntity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NoncontrollingInterestInVariableInterestEntity" xlink:to="lab_us-gaap_NoncontrollingInterestInVariableInterestEntity" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_CollateralizedTermLoan_bd9a104c-9657-4a89-82e3-a76fae4affc1_terseLabel_en-US" xlink:label="lab_sui_CollateralizedTermLoan" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collateralized Term Loan</link:label>
    <link:label id="lab_sui_CollateralizedTermLoan_label_en-US" xlink:label="lab_sui_CollateralizedTermLoan" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collateralized Term Loan</link:label>
    <link:label id="lab_sui_CollateralizedTermLoan_documentation_en-US" xlink:label="lab_sui_CollateralizedTermLoan" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collateralized Term Loan</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_CollateralizedTermLoan" xlink:href="sui-20210630.xsd#sui_CollateralizedTermLoan"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_CollateralizedTermLoan" xlink:to="lab_sui_CollateralizedTermLoan" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_RealEstateReclassifiedFromHeldForSaleToHeldAndUsed_2148b3fd-9d40-4f00-b226-d10a65d1b1c6_terseLabel_en-US" xlink:label="lab_sui_RealEstateReclassifiedFromHeldForSaleToHeldAndUsed" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Real Estate Reclassified from Held for Sale to Held and used</link:label>
    <link:label id="lab_sui_RealEstateReclassifiedFromHeldForSaleToHeldAndUsed_label_en-US" xlink:label="lab_sui_RealEstateReclassifiedFromHeldForSaleToHeldAndUsed" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Real Estate Reclassified from Held for Sale to Held and used</link:label>
    <link:label id="lab_sui_RealEstateReclassifiedFromHeldForSaleToHeldAndUsed_documentation_en-US" xlink:label="lab_sui_RealEstateReclassifiedFromHeldForSaleToHeldAndUsed" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Real Estate Reclassified from Held for Sale to Held and used</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_RealEstateReclassifiedFromHeldForSaleToHeldAndUsed" xlink:href="sui-20210630.xsd#sui_RealEstateReclassifiedFromHeldForSaleToHeldAndUsed"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_RealEstateReclassifiedFromHeldForSaleToHeldAndUsed" xlink:to="lab_sui_RealEstateReclassifiedFromHeldForSaleToHeldAndUsed" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_TotalEquityMember_f30845c0-987c-47a1-9c40-8d6667b61ea7_terseLabel_en-US" xlink:label="lab_sui_TotalEquityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Equity</link:label>
    <link:label id="lab_sui_TotalEquityMember_label_en-US" xlink:label="lab_sui_TotalEquityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Equity [Member]</link:label>
    <link:label id="lab_sui_TotalEquityMember_documentation_en-US" xlink:label="lab_sui_TotalEquityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_TotalEquityMember" xlink:href="sui-20210630.xsd#sui_TotalEquityMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_TotalEquityMember" xlink:to="lab_sui_TotalEquityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_DebtInstrumentNumberOfPropertiesSecuringDebtInstument_ae5e694c-1679-47c1-93f1-68c66b94cc3e_terseLabel_en-US" xlink:label="lab_sui_DebtInstrumentNumberOfPropertiesSecuringDebtInstument" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument, number of properties securing a debt instument</link:label>
    <link:label id="lab_sui_DebtInstrumentNumberOfPropertiesSecuringDebtInstument_label_en-US" xlink:label="lab_sui_DebtInstrumentNumberOfPropertiesSecuringDebtInstument" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument, number of properties securing a debt instument</link:label>
    <link:label id="lab_sui_DebtInstrumentNumberOfPropertiesSecuringDebtInstument_documentation_en-US" xlink:label="lab_sui_DebtInstrumentNumberOfPropertiesSecuringDebtInstument" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument, number of properties securing a debt instument</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_DebtInstrumentNumberOfPropertiesSecuringDebtInstument" xlink:href="sui-20210630.xsd#sui_DebtInstrumentNumberOfPropertiesSecuringDebtInstument"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_DebtInstrumentNumberOfPropertiesSecuringDebtInstument" xlink:to="lab_sui_DebtInstrumentNumberOfPropertiesSecuringDebtInstument" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_985d80a0-5be5-4174-a1a8-e8c7b331a9a5_terseLabel_en-US" xlink:label="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Organization, Consolidation and Presentation of Financial Statements [Abstract]</link:label>
    <link:label id="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_label_en-US" xlink:label="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Organization, Consolidation and Presentation of Financial Statements [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:to="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PaymentsOfFinancingCosts_5e235593-4b64-4d99-80e6-aea36386b6ed_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfFinancingCosts" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payments for deferred financing costs</link:label>
    <link:label id="lab_us-gaap_PaymentsOfFinancingCosts_label_en-US" xlink:label="lab_us-gaap_PaymentsOfFinancingCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payments of Financing Costs</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfFinancingCosts" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfFinancingCosts"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsOfFinancingCosts" xlink:to="lab_us-gaap_PaymentsOfFinancingCosts" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_VariableLeaseCost_2a89af2e-756f-4fe3-a377-387657472781_verboseLabel_en-US" xlink:label="lab_us-gaap_VariableLeaseCost" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable lease expense</link:label>
    <link:label id="lab_us-gaap_VariableLeaseCost_label_en-US" xlink:label="lab_us-gaap_VariableLeaseCost" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Lease, Cost</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableLeaseCost"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableLeaseCost" xlink:to="lab_us-gaap_VariableLeaseCost" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_PrimeMarthasVineyardMember_c9f075f0-8e2a-442d-9ea0-4458de62fb90_terseLabel_en-US" xlink:label="lab_sui_PrimeMarthasVineyardMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Prime Martha's Vineyard</link:label>
    <link:label id="lab_sui_PrimeMarthasVineyardMember_label_en-US" xlink:label="lab_sui_PrimeMarthasVineyardMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Prime Martha's Vineyard [Member]</link:label>
    <link:label id="lab_sui_PrimeMarthasVineyardMember_documentation_en-US" xlink:label="lab_sui_PrimeMarthasVineyardMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Prime Martha's Vineyard</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_PrimeMarthasVineyardMember" xlink:href="sui-20210630.xsd#sui_PrimeMarthasVineyardMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_PrimeMarthasVineyardMember" xlink:to="lab_sui_PrimeMarthasVineyardMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet_ff5a8b5c-da03-4cca-9195-6b59a02a54d8_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of Credit Facility, Increase (Decrease), Net</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of Credit Facility, Increase (Decrease), Net</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet" xlink:to="lab_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_NumberofMotorHomeCommunities_e4fc0c3e-38c4-466a-b1c0-99d125771a5b_terseLabel_en-US" xlink:label="lab_sui_NumberofMotorHomeCommunities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of motor home communities (in communities)</link:label>
    <link:label id="lab_sui_NumberofMotorHomeCommunities_label_en-US" xlink:label="lab_sui_NumberofMotorHomeCommunities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Motor Home Communities</link:label>
    <link:label id="lab_sui_NumberofMotorHomeCommunities_documentation_en-US" xlink:label="lab_sui_NumberofMotorHomeCommunities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Motor Home Communities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_NumberofMotorHomeCommunities" xlink:href="sui-20210630.xsd#sui_NumberofMotorHomeCommunities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_NumberofMotorHomeCommunities" xlink:to="lab_sui_NumberofMotorHomeCommunities" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_WeightedAverageCommonSharesOutstandingAbstract_b7adb67e-5c4d-478c-8d15-0873f0b33a0d_terseLabel_en-US" xlink:label="lab_sui_WeightedAverageCommonSharesOutstandingAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average common shares outstanding:</link:label>
    <link:label id="lab_sui_WeightedAverageCommonSharesOutstandingAbstract_label_en-US" xlink:label="lab_sui_WeightedAverageCommonSharesOutstandingAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Common Shares Outstanding [Abstract]</link:label>
    <link:label id="lab_sui_WeightedAverageCommonSharesOutstandingAbstract_documentation_en-US" xlink:label="lab_sui_WeightedAverageCommonSharesOutstandingAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Common Shares Outstanding [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_WeightedAverageCommonSharesOutstandingAbstract" xlink:href="sui-20210630.xsd#sui_WeightedAverageCommonSharesOutstandingAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_WeightedAverageCommonSharesOutstandingAbstract" xlink:to="lab_sui_WeightedAverageCommonSharesOutstandingAbstract" xlink:type="arc" order="1"/>
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    <link:label id="lab_us-gaap_OtherNoncashIncomeTaxExpense_3545b8fb-ffa4-42c8-ba51-c710a4ba2633_terseLabel_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeTaxExpense" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Noncash Income Tax Expense</link:label>
    <link:label id="lab_us-gaap_OtherNoncashIncomeTaxExpense_label_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeTaxExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Noncash Income Tax Expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeTaxExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNoncashIncomeTaxExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherNoncashIncomeTaxExpense" xlink:to="lab_us-gaap_OtherNoncashIncomeTaxExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressCityOrTown_7415d4f0-f1cc-4cda-b9d8-d515fd99bf80_terseLabel_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, City or Town</link:label>
    <link:label id="lab_dei_EntityAddressCityOrTown_label_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, City or Town</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressCityOrTown"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressCityOrTown" xlink:to="lab_dei_EntityAddressCityOrTown" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_VIEasaPercentageofTotalEquity_b2001b92-5187-4235-b1fa-eaf625d13b8d_terseLabel_en-US" xlink:label="lab_sui_VIEasaPercentageofTotalEquity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">VIE as a Percentage of Total Equity</link:label>
    <link:label id="lab_sui_VIEasaPercentageofTotalEquity_label_en-US" xlink:label="lab_sui_VIEasaPercentageofTotalEquity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">VIE as a Percentage of Total Equity</link:label>
    <link:label id="lab_sui_VIEasaPercentageofTotalEquity_documentation_en-US" xlink:label="lab_sui_VIEasaPercentageofTotalEquity" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">VIE as a Percentage of Total Equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_VIEasaPercentageofTotalEquity" xlink:href="sui-20210630.xsd#sui_VIEasaPercentageofTotalEquity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_VIEasaPercentageofTotalEquity" xlink:to="lab_sui_VIEasaPercentageofTotalEquity" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_VariableInterestEntityasaPercentageofConsolidatedAssets_6313f817-25b8-433e-8b64-ee59eb8e48e6_terseLabel_en-US" xlink:label="lab_sui_VariableInterestEntityasaPercentageofConsolidatedAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">VIE as a Percentage of Consolidated Assets</link:label>
    <link:label id="lab_sui_VariableInterestEntityasaPercentageofConsolidatedAssets_label_en-US" xlink:label="lab_sui_VariableInterestEntityasaPercentageofConsolidatedAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Interest Entity as a Percentage of Consolidated Assets</link:label>
    <link:label id="lab_sui_VariableInterestEntityasaPercentageofConsolidatedAssets_documentation_en-US" xlink:label="lab_sui_VariableInterestEntityasaPercentageofConsolidatedAssets" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Interest Entity as a Percentage of Consolidated Assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_VariableInterestEntityasaPercentageofConsolidatedAssets" xlink:href="sui-20210630.xsd#sui_VariableInterestEntityasaPercentageofConsolidatedAssets"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_VariableInterestEntityasaPercentageofConsolidatedAssets" xlink:to="lab_sui_VariableInterestEntityasaPercentageofConsolidatedAssets" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentAxis_b80305f1-d076-4cfa-9b65-9a9e90df295e_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument [Axis]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentAxis_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentAxis" xlink:to="lab_us-gaap_DebtInstrumentAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_3b3d4ee1-676f-44e3-970e-646cedafaa3a_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Term of operating lease not yet commenced</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1" xlink:to="lab_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilities_57a4ff8b-23ea-467c-ae2a-e5c8055b0c7d_terseLabel_en-US" xlink:label="lab_sui_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets (Liabilities)</link:label>
    <link:label id="lab_sui_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilities_label_en-US" xlink:label="lab_sui_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets (Liabilities)</link:label>
    <link:label id="lab_sui_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilities_documentation_en-US" xlink:label="lab_sui_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets (Liabilities)</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilities" xlink:href="sui-20210630.xsd#sui_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilities" xlink:to="lab_sui_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherAssetsLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_NumberOfSites_101b4170-637c-4b90-b9e2-93c5ddb9864c_terseLabel_en-US" xlink:label="lab_sui_NumberOfSites" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Sites</link:label>
    <link:label id="lab_sui_NumberOfSites_label_en-US" xlink:label="lab_sui_NumberOfSites" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Sites</link:label>
    <link:label id="lab_sui_NumberOfSites_documentation_en-US" xlink:label="lab_sui_NumberOfSites" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Sites</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_NumberOfSites" xlink:href="sui-20210630.xsd#sui_NumberOfSites"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_NumberOfSites" xlink:to="lab_sui_NumberOfSites" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_NumberOfHousingSitesSold_066a8bcb-d2b8-4bfd-959c-bd78fe6dd5fe_terseLabel_en-US" xlink:label="lab_sui_NumberOfHousingSitesSold" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Housing Sites Sold</link:label>
    <link:label id="lab_sui_NumberOfHousingSitesSold_label_en-US" xlink:label="lab_sui_NumberOfHousingSitesSold" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Housing Sites Sold</link:label>
    <link:label id="lab_sui_NumberOfHousingSitesSold_documentation_en-US" xlink:label="lab_sui_NumberOfHousingSitesSold" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Housing Sites Sold</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_NumberOfHousingSitesSold" xlink:href="sui-20210630.xsd#sui_NumberOfHousingSitesSold"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_NumberOfHousingSitesSold" xlink:to="lab_sui_NumberOfHousingSitesSold" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_80929c66-cf55-4309-9a2b-779362dbf6b4_terseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commitments And Contingencies</link:label>
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commitments and Contingencies Disclosure [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:to="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_MasseysLandingMember_e6c1882d-7aa2-4882-934e-ff5dc55c56bc_terseLabel_en-US" xlink:label="lab_sui_MasseysLandingMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">El Capitan &amp; Ocean Mesa(3)(4)</link:label>
    <link:label id="lab_sui_MasseysLandingMember_label_en-US" xlink:label="lab_sui_MasseysLandingMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Massey's Landing [Member]</link:label>
    <link:label id="lab_sui_MasseysLandingMember_documentation_en-US" xlink:label="lab_sui_MasseysLandingMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Massey's Landing [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_MasseysLandingMember" xlink:href="sui-20210630.xsd#sui_MasseysLandingMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_MasseysLandingMember" xlink:to="lab_sui_MasseysLandingMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ReceivableWithImputedInterestNetAmount_68225485-0097-4c8e-8520-2ba0930779f0_terseLabel_en-US" xlink:label="lab_us-gaap_ReceivableWithImputedInterestNetAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Receivable with imputed interest, net</link:label>
    <link:label id="lab_us-gaap_ReceivableWithImputedInterestNetAmount_label_en-US" xlink:label="lab_us-gaap_ReceivableWithImputedInterestNetAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Receivable with Imputed Interest, Net Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableWithImputedInterestNetAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReceivableWithImputedInterestNetAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReceivableWithImputedInterestNetAmount" xlink:to="lab_us-gaap_ReceivableWithImputedInterestNetAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount_cf04c4f5-fc1e-4733-a667-a2532cbd4f83_terseLabel_en-US" xlink:label="lab_us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount</link:label>
    <link:label id="lab_us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount_label_en-US" xlink:label="lab_us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount" xlink:to="lab_us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_SeriesFPreferredOPUnitsMember_29dce832-d8d9-43f3-8756-66fda55489a0_terseLabel_en-US" xlink:label="lab_sui_SeriesFPreferredOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series F Preferred OP Units</link:label>
    <link:label id="lab_sui_SeriesFPreferredOPUnitsMember_label_en-US" xlink:label="lab_sui_SeriesFPreferredOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series F Preferred OP Units [Member]</link:label>
    <link:label id="lab_sui_SeriesFPreferredOPUnitsMember_documentation_en-US" xlink:label="lab_sui_SeriesFPreferredOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series F Preferred OP Units</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_SeriesFPreferredOPUnitsMember" xlink:href="sui-20210630.xsd#sui_SeriesFPreferredOPUnitsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_SeriesFPreferredOPUnitsMember" xlink:to="lab_sui_SeriesFPreferredOPUnitsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_d4bd71d9-dc8c-4ec0-91d1-78365e2deb91_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related Party [Axis]</link:label>
    <link:label id="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Related Party [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_DisclosureofVariableInterestEntitiesTextBlock_37dc48a8-11c0-4ae0-ab53-7a8b4419cf8d_terseLabel_en-US" xlink:label="lab_sui_DisclosureofVariableInterestEntitiesTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consolidated Variable Interest Entities</link:label>
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    <link:label id="lab_us-gaap_PrimeRateMember_170a8588-c3bc-42a6-b6c2-9fc4c4f8aaad_terseLabel_en-US" xlink:label="lab_us-gaap_PrimeRateMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Prime Rate [Member]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrimeRateMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PrimeRateMember"/>
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    <link:label id="lab_sui_RezPlotMember_0ea55fea-a839-4124-81f3-deb0a2940883_terseLabel_en-US" xlink:label="lab_sui_RezPlotMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">RezPlot [Member]</link:label>
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    <link:label id="lab_sui_SeriesA1PreferredOpUnitsMember_3dd49c56-3fe7-4707-a310-fd6d311089eb_terseLabel_en-US" xlink:label="lab_sui_SeriesA1PreferredOpUnitsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series A-1 Preferred OP Units</link:label>
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    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyAtCost_2a2657aa-0a42-4413-9e0e-76e6f8acb087_totalLabel_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyAtCost" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment property</link:label>
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    <link:label id="lab_sui_KeyEmployeesMember_88fc8f06-f9b0-427f-a6ef-79a9a5fed10d_terseLabel_en-US" xlink:label="lab_sui_KeyEmployeesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Key Employees [Member]</link:label>
    <link:label id="lab_sui_KeyEmployeesMember_label_en-US" xlink:label="lab_sui_KeyEmployeesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Key Employees [Member]</link:label>
    <link:label id="lab_sui_KeyEmployeesMember_documentation_en-US" xlink:label="lab_sui_KeyEmployeesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Key Employees [Member]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_KeyEmployeesMember" xlink:to="lab_sui_KeyEmployeesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_f81fb8cd-f0f8-4269-ab03-4e49ec96bcde_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
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    <link:label id="lab_us-gaap_OperatingLeasePayments_9012a3f6-c07c-4ce9-a4bb-c0cd76045e15_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating cash flow used for operating leases</link:label>
    <link:label id="lab_us-gaap_OperatingLeasePayments_label_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Lease, Payments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasePayments" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeasePayments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasePayments" xlink:to="lab_us-gaap_OperatingLeasePayments" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_TermLoanMember_6bc96e13-b8d0-487c-9375-b9f7f74ce16c_terseLabel_en-US" xlink:label="lab_sui_TermLoanMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Term Loan [Member]</link:label>
    <link:label id="lab_sui_TermLoanMember_label_en-US" xlink:label="lab_sui_TermLoanMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Term Loan [Member]</link:label>
    <link:label id="lab_sui_TermLoanMember_documentation_en-US" xlink:label="lab_sui_TermLoanMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Term Loan [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_TermLoanMember" xlink:href="sui-20210630.xsd#sui_TermLoanMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_TermLoanMember" xlink:to="lab_sui_TermLoanMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_802a2408-9296-48f7-b55f-fdc0e31838dd_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessor, Operating Lease, Payment to be Received, Year Five</link:label>
    <link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessor, Operating Lease, Payment to be Received, Year Five</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears"/>
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    <link:label id="lab_us-gaap_BusinessCombinationConsiderationTransferred1_59396524-b16b-4300-a60c-39b67af12e19_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationConsiderationTransferred1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total consideration</link:label>
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    <link:label id="lab_us-gaap_AssetsFairValueDisclosure_2ffec726-d2e0-41fc-aef4-c0827b28e070_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Assets, Fair Value Disclosure</link:label>
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    <link:label id="lab_sui_OtherReceivablesForRentWaterSewerUsage_657af0cc-60d9-4694-a595-520fd00c16ef_terseLabel_en-US" xlink:label="lab_sui_OtherReceivablesForRentWaterSewerUsage" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other receivables for rent, water, sewer usage</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_sui_OtherReceivablesForRentWaterSewerUsage" xlink:href="sui-20210630.xsd#sui_OtherReceivablesForRentWaterSewerUsage"/>
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    <link:label id="lab_sui_RealPropertyOperationsSegmentMember_31be31eb-2cb8-4a96-ad41-24ad5aeaecf0_terseLabel_en-US" xlink:label="lab_sui_RealPropertyOperationsSegmentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Real Property Operations Segment [Member]</link:label>
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    <link:label id="lab_sui_RealPropertyOperationsSegmentMember_documentation_en-US" xlink:label="lab_sui_RealPropertyOperationsSegmentMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Real Property Operations Segment [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_RealPropertyOperationsSegmentMember" xlink:href="sui-20210630.xsd#sui_RealPropertyOperationsSegmentMember"/>
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    <link:label id="lab_us-gaap_NumberOfUnitsInRealEstateProperty_label_en-US" xlink:label="lab_us-gaap_NumberOfUnitsInRealEstateProperty" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Units in Real Estate Property</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfUnitsInRealEstateProperty" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NumberOfUnitsInRealEstateProperty" xlink:to="lab_us-gaap_NumberOfUnitsInRealEstateProperty" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_PuertoDelReyMember_d5e8236a-349f-4aab-a3e2-6bf7d0bb1184_terseLabel_en-US" xlink:label="lab_sui_PuertoDelReyMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Puerto del Rey</link:label>
    <link:label id="lab_sui_PuertoDelReyMember_label_en-US" xlink:label="lab_sui_PuertoDelReyMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Puerto del Rey [Member]</link:label>
    <link:label id="lab_sui_PuertoDelReyMember_documentation_en-US" xlink:label="lab_sui_PuertoDelReyMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Puerto del Rey</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_PuertoDelReyMember" xlink:href="sui-20210630.xsd#sui_PuertoDelReyMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_PuertoDelReyMember" xlink:to="lab_sui_PuertoDelReyMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_ScheduleofIntangibleAssetsAmortizationExpenseTableTextBlock_664b7514-7094-42af-8055-b1dcbdc857f8_terseLabel_en-US" xlink:label="lab_sui_ScheduleofIntangibleAssetsAmortizationExpenseTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Intangible Assets Amortization Expense</link:label>
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    <link:label id="lab_sui_ScheduleofIntangibleAssetsAmortizationExpenseTableTextBlock_documentation_en-US" xlink:label="lab_sui_ScheduleofIntangibleAssetsAmortizationExpenseTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Intangible Assets Amortization Expense [Table Text Block] - Tabular disclosure of amortization expense related to finite-lived intangible assets by category.</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_ScheduleofIntangibleAssetsAmortizationExpenseTableTextBlock" xlink:to="lab_sui_ScheduleofIntangibleAssetsAmortizationExpenseTableTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CommitmentsAndContingencies_83b405ee-3851-477d-89c8-fe91e5a289be_terseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Commitments and contingencies (see Note 15)</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommitmentsAndContingencies" xlink:to="lab_us-gaap_CommitmentsAndContingencies" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SubsequentEventTable_973a4ac3-91cf-48f1-8950-7354fd5e7e2e_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsequent Event [Table]</link:label>
    <link:label id="lab_us-gaap_SubsequentEventTable_label_en-US" xlink:label="lab_us-gaap_SubsequentEventTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subsequent Event [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventTable" xlink:to="lab_us-gaap_SubsequentEventTable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue_1d93082e-014c-426c-8516-1c09c1c82300_terseLabel_en-US" xlink:label="lab_us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Servicing Asset at Fair Value, Other Changes in Fair Value</link:label>
    <link:label id="lab_us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue_label_en-US" xlink:label="lab_us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Servicing Asset at Fair Value, Other Changes in Fair Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue" xlink:to="lab_us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_f04afc57-c342-4c5f-9956-ab35cc1c011f_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accumulated other comprehensive income</link:label>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss), Net of Tax</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:to="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_OtherReceivablesNetMember_7d14206e-f377-4adc-ae68-5b7dea754fea_terseLabel_en-US" xlink:label="lab_sui_OtherReceivablesNetMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other receivables, net</link:label>
    <link:label id="lab_sui_OtherReceivablesNetMember_label_en-US" xlink:label="lab_sui_OtherReceivablesNetMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other receivables, net [Member]</link:label>
    <link:label id="lab_sui_OtherReceivablesNetMember_documentation_en-US" xlink:label="lab_sui_OtherReceivablesNetMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other receivables, net [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_OtherReceivablesNetMember" xlink:href="sui-20210630.xsd#sui_OtherReceivablesNetMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_OtherReceivablesNetMember" xlink:to="lab_sui_OtherReceivablesNetMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_AllowanceForRentWaterSewerUsageReceivables_7be8e5b4-b0a7-4dad-8a2c-abb82f03d222_negatedTerseLabel_en-US" xlink:label="lab_sui_AllowanceForRentWaterSewerUsageReceivables" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Allowance for rent, water, sewer usage receivables</link:label>
    <link:label id="lab_sui_AllowanceForRentWaterSewerUsageReceivables_label_en-US" xlink:label="lab_sui_AllowanceForRentWaterSewerUsageReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Allowance for rent, water, sewer usage receivables</link:label>
    <link:label id="lab_sui_AllowanceForRentWaterSewerUsageReceivables_documentation_en-US" xlink:label="lab_sui_AllowanceForRentWaterSewerUsageReceivables" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Allowance for rent, water, sewer usage receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_AllowanceForRentWaterSewerUsageReceivables" xlink:href="sui-20210630.xsd#sui_AllowanceForRentWaterSewerUsageReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_AllowanceForRentWaterSewerUsageReceivables" xlink:to="lab_sui_AllowanceForRentWaterSewerUsageReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_RestrictedStockMember_5c4e4de8-a500-4050-a899-3a58ba1166e2_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Restricted Stock [Member]</link:label>
    <link:label id="lab_us-gaap_RestrictedStockMember_label_en-US" xlink:label="lab_us-gaap_RestrictedStockMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Restricted Stock [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedStockMember" xlink:to="lab_us-gaap_RestrictedStockMember" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_cf18981a-4f3e-434f-8ceb-a1f8b5d4b117_terseLabel_en-US" xlink:label="lab_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Real Estate, Type of Property [Axis]</link:label>
    <link:label id="lab_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_label_en-US" xlink:label="lab_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Real Estate, Type of Property [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" xlink:to="lab_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfDebt_ab8e0341-af4e-4657-b5c7-f6956585feb5_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfDebt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from Issuance of Debt</link:label>
    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfDebt_label_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfDebt" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from Issuance of Debt</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromIssuanceOfDebt" xlink:to="lab_us-gaap_ProceedsFromIssuanceOfDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentPeriodEndDate_1866e43f-0e59-4730-97f6-0c5e1491ebf8_terseLabel_en-US" xlink:label="lab_dei_DocumentPeriodEndDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Period End Date</link:label>
    <link:label id="lab_dei_DocumentPeriodEndDate_label_en-US" xlink:label="lab_dei_DocumentPeriodEndDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Period End Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentPeriodEndDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentPeriodEndDate" xlink:to="lab_dei_DocumentPeriodEndDate" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_NumberOfShareBasedCompensationPlans_945f7298-7a07-4f96-84d2-1962f1e84849_terseLabel_en-US" xlink:label="lab_sui_NumberOfShareBasedCompensationPlans" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Share-Based Compensation Plans</link:label>
    <link:label id="lab_sui_NumberOfShareBasedCompensationPlans_label_en-US" xlink:label="lab_sui_NumberOfShareBasedCompensationPlans" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Share-Based Compensation Plans</link:label>
    <link:label id="lab_sui_NumberOfShareBasedCompensationPlans_documentation_en-US" xlink:label="lab_sui_NumberOfShareBasedCompensationPlans" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Share-Based Compensation Plans</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_NumberOfShareBasedCompensationPlans" xlink:href="sui-20210630.xsd#sui_NumberOfShareBasedCompensationPlans"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_NumberOfShareBasedCompensationPlans" xlink:to="lab_sui_NumberOfShareBasedCompensationPlans" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_AssetAcquisitionPaymentsToAcquireBusinessesGross_5e25a86c-b9f5-4f51-834c-ca49fee344a7_terseLabel_en-US" xlink:label="lab_sui_AssetAcquisitionPaymentsToAcquireBusinessesGross" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset Acquisition, Payments to Acquire Businesses, Gross</link:label>
    <link:label id="lab_sui_AssetAcquisitionPaymentsToAcquireBusinessesGross_label_en-US" xlink:label="lab_sui_AssetAcquisitionPaymentsToAcquireBusinessesGross" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset Acquisition, Payments to Acquire Businesses, Gross</link:label>
    <link:label id="lab_sui_AssetAcquisitionPaymentsToAcquireBusinessesGross_documentation_en-US" xlink:label="lab_sui_AssetAcquisitionPaymentsToAcquireBusinessesGross" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset Acquisition, Payments to Acquire Businesses, Gross</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_AssetAcquisitionPaymentsToAcquireBusinessesGross" xlink:href="sui-20210630.xsd#sui_AssetAcquisitionPaymentsToAcquireBusinessesGross"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_AssetAcquisitionPaymentsToAcquireBusinessesGross" xlink:to="lab_sui_AssetAcquisitionPaymentsToAcquireBusinessesGross" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CostsAndExpenses_daa934b4-77a3-4ada-bb16-1c9f7e0e599a_totalLabel_en-US" xlink:label="lab_us-gaap_CostsAndExpenses" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Expenses</link:label>
    <link:label id="lab_us-gaap_CostsAndExpenses_label_en-US" xlink:label="lab_us-gaap_CostsAndExpenses" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Costs and Expenses</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostsAndExpenses"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostsAndExpenses" xlink:to="lab_us-gaap_CostsAndExpenses" xlink:type="arc" order="1"/>
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    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_52b52302-63ca-425d-bec9-62dcb9922de9_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Less: Imputed interest</link:label>
    <link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessee, Operating Lease, Liability, Undiscounted Excess Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
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    <link:label id="lab_us-gaap_ProceedsFromSaleOfOtherProductiveAssets_3cdbd8ed-2b06-40ae-915b-4cf312ccae34_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfOtherProductiveAssets" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Proceeds from disposition of properties</link:label>
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    <link:label id="lab_sui_FourLeafPortfolioMember_d01a66d1-ef8d-4e66-9e4a-6c6758d89906_terseLabel_en-US" xlink:label="lab_sui_FourLeafPortfolioMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Four Leaf Portfolio</link:label>
    <link:label id="lab_sui_FourLeafPortfolioMember_label_en-US" xlink:label="lab_sui_FourLeafPortfolioMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Four Leaf Portfolio [Member]</link:label>
    <link:label id="lab_sui_FourLeafPortfolioMember_documentation_en-US" xlink:label="lab_sui_FourLeafPortfolioMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Four Leaf Portfolio</link:label>
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    <link:label id="lab_sui_SeriesGPreferredOPUnitsMember_6ca334d7-39fa-46bc-9ff2-159965908f33_terseLabel_en-US" xlink:label="lab_sui_SeriesGPreferredOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series G Preferred OP Units</link:label>
    <link:label id="lab_sui_SeriesGPreferredOPUnitsMember_label_en-US" xlink:label="lab_sui_SeriesGPreferredOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series G Preferred OP Units [Member]</link:label>
    <link:label id="lab_sui_SeriesGPreferredOPUnitsMember_documentation_en-US" xlink:label="lab_sui_SeriesGPreferredOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series G Preferred OP Units</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_SeriesGPreferredOPUnitsMember" xlink:href="sui-20210630.xsd#sui_SeriesGPreferredOPUnitsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_SeriesGPreferredOPUnitsMember" xlink:to="lab_sui_SeriesGPreferredOPUnitsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FinancialInstrumentAxis_1c0754b0-04e4-46c0-862c-d19164de3754_terseLabel_en-US" xlink:label="lab_us-gaap_FinancialInstrumentAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Instrument [Axis]</link:label>
    <link:label id="lab_us-gaap_FinancialInstrumentAxis_label_en-US" xlink:label="lab_us-gaap_FinancialInstrumentAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Financial Instrument [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinancialInstrumentAxis" xlink:to="lab_us-gaap_FinancialInstrumentAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_942f59e4-e43d-4a13-a2e8-274d1e8b0066_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity interest issued or issuable, number of shares (in shares)</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Acquisition, Equity Interest Issued or Issuable, Number of Shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:to="lab_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_AspenSeriesB3PreferredOperatingPartnershipUnitsMember_779bf532-6ab3-4abf-ab5e-b7eb1cf8336b_verboseLabel_en-US" xlink:label="lab_sui_AspenSeriesB3PreferredOperatingPartnershipUnitsMember" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Aspen Series B3 Preferred Operating Partnership Units [Member]</link:label>
    <link:label id="lab_sui_AspenSeriesB3PreferredOperatingPartnershipUnitsMember_5e495f9d-dc7a-4ec6-ad7e-028747e9de33_terseLabel_en-US" xlink:label="lab_sui_AspenSeriesB3PreferredOperatingPartnershipUnitsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred OP units [Member]</link:label>
    <link:label id="lab_sui_AspenSeriesB3PreferredOperatingPartnershipUnitsMember_label_en-US" xlink:label="lab_sui_AspenSeriesB3PreferredOperatingPartnershipUnitsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Aspen Series B3 Preferred Operating Partnership Units [Member]</link:label>
    <link:label id="lab_sui_AspenSeriesB3PreferredOperatingPartnershipUnitsMember_documentation_en-US" xlink:label="lab_sui_AspenSeriesB3PreferredOperatingPartnershipUnitsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Aspen Series B3 Preferred Operating Partnership Units [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_AspenSeriesB3PreferredOperatingPartnershipUnitsMember" xlink:href="sui-20210630.xsd#sui_AspenSeriesB3PreferredOperatingPartnershipUnitsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_AspenSeriesB3PreferredOperatingPartnershipUnitsMember" xlink:to="lab_sui_AspenSeriesB3PreferredOperatingPartnershipUnitsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_ElCapitanOceanMesaMember_4bda910a-47e3-4921-bdff-a65a7c91321d_terseLabel_en-US" xlink:label="lab_sui_ElCapitanOceanMesaMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">El Capitan &amp; Ocean Mesa [Member]</link:label>
    <link:label id="lab_sui_ElCapitanOceanMesaMember_label_en-US" xlink:label="lab_sui_ElCapitanOceanMesaMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">El Capitan &amp; Ocean Mesa [Member]</link:label>
    <link:label id="lab_sui_ElCapitanOceanMesaMember_documentation_en-US" xlink:label="lab_sui_ElCapitanOceanMesaMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">El Capitan &amp; Ocean Mesa</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_ElCapitanOceanMesaMember" xlink:href="sui-20210630.xsd#sui_ElCapitanOceanMesaMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_ElCapitanOceanMesaMember" xlink:to="lab_sui_ElCapitanOceanMesaMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_b5a73b77-fd74-4725-b0b6-eeaa182c16b0_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Less: Imputed interest</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance Lease, Liability, Undiscounted Excess Amount</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount" xlink:to="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_SeriesHPreferredOPUnitsMember_39345b40-c44f-45ab-b7f1-7492a4e6fde7_terseLabel_en-US" xlink:label="lab_sui_SeriesHPreferredOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series H Preferred OP Units</link:label>
    <link:label id="lab_sui_SeriesHPreferredOPUnitsMember_label_en-US" xlink:label="lab_sui_SeriesHPreferredOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series H Preferred OP Units [Member]</link:label>
    <link:label id="lab_sui_SeriesHPreferredOPUnitsMember_documentation_en-US" xlink:label="lab_sui_SeriesHPreferredOPUnitsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series H Preferred OP Units</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_SeriesHPreferredOPUnitsMember" xlink:href="sui-20210630.xsd#sui_SeriesHPreferredOPUnitsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_SeriesHPreferredOPUnitsMember" xlink:to="lab_sui_SeriesHPreferredOPUnitsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ScheduleOfConversionsOfStockTextBlock_f5f98452-599c-41f6-a136-736580d88c3f_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfConversionsOfStockTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Activity of Conversions</link:label>
    <link:label id="lab_us-gaap_ScheduleOfConversionsOfStockTextBlock_label_en-US" xlink:label="lab_us-gaap_ScheduleOfConversionsOfStockTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of Conversions of Stock [Table Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfConversionsOfStockTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfConversionsOfStockTextBlock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfConversionsOfStockTextBlock" xlink:to="lab_us-gaap_ScheduleOfConversionsOfStockTextBlock" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_VariableInterestEntityEquityInterestsIssuedFloatingRate_52954c75-57d8-485c-8c1c-78c5f45a57cb_terseLabel_en-US" xlink:label="lab_sui_VariableInterestEntityEquityInterestsIssuedFloatingRate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Interest Entity, Equity Interests Issued, Floating Rate</link:label>
    <link:label id="lab_sui_VariableInterestEntityEquityInterestsIssuedFloatingRate_label_en-US" xlink:label="lab_sui_VariableInterestEntityEquityInterestsIssuedFloatingRate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Interest Entity, Equity Interests Issued, Floating Rate</link:label>
    <link:label id="lab_sui_VariableInterestEntityEquityInterestsIssuedFloatingRate_documentation_en-US" xlink:label="lab_sui_VariableInterestEntityEquityInterestsIssuedFloatingRate" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Interest Entity, Equity Interests Issued, Floating Rate</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_VariableInterestEntityEquityInterestsIssuedFloatingRate" xlink:href="sui-20210630.xsd#sui_VariableInterestEntityEquityInterestsIssuedFloatingRate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_VariableInterestEntityEquityInterestsIssuedFloatingRate" xlink:to="lab_sui_VariableInterestEntityEquityInterestsIssuedFloatingRate" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_AssetsHeldForSaleAdjustmentOfNotesReceivable_341ce27f-31ae-49d6-900b-2870fe257825_terseLabel_en-US" xlink:label="lab_sui_AssetsHeldForSaleAdjustmentOfNotesReceivable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Assets Held For Sale, Adjustment Of Notes Receivable</link:label>
    <link:label id="lab_sui_AssetsHeldForSaleAdjustmentOfNotesReceivable_label_en-US" xlink:label="lab_sui_AssetsHeldForSaleAdjustmentOfNotesReceivable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Assets Held For Sale, Adjustment Of Notes Receivable</link:label>
    <link:label id="lab_sui_AssetsHeldForSaleAdjustmentOfNotesReceivable_documentation_en-US" xlink:label="lab_sui_AssetsHeldForSaleAdjustmentOfNotesReceivable" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Assets Held For Sale, Adjustment Of Notes Receivable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_AssetsHeldForSaleAdjustmentOfNotesReceivable" xlink:href="sui-20210630.xsd#sui_AssetsHeldForSaleAdjustmentOfNotesReceivable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_AssetsHeldForSaleAdjustmentOfNotesReceivable" xlink:to="lab_sui_AssetsHeldForSaleAdjustmentOfNotesReceivable" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CarryingReportedAmountFairValueDisclosureMember_98c148c3-f45a-456e-a6ed-23d387975538_terseLabel_en-US" xlink:label="lab_us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reported Value Measurement</link:label>
    <link:label id="lab_us-gaap_CarryingReportedAmountFairValueDisclosureMember_label_en-US" xlink:label="lab_us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Reported Value Measurement [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:to="lab_us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OperatingCostsAndExpensesAbstract_ea884137-ecd4-4763-b395-2817500044aa_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingCostsAndExpensesAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Expenses</link:label>
    <link:label id="lab_us-gaap_OperatingCostsAndExpensesAbstract_label_en-US" xlink:label="lab_us-gaap_OperatingCostsAndExpensesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Costs and Expenses [Abstract]</link:label>
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    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_6c313ccb-2a40-4b55-8ccf-94e87eec8bfa_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2023</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finance Lease, Liability, to be Paid, Year Five</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CommonStockMember_84b7ebfa-f33e-4c24-a728-88fea4306de6_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Stock</link:label>
    <link:label id="lab_us-gaap_CommonStockMember_label_en-US" xlink:label="lab_us-gaap_CommonStockMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Stock [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockMember"/>
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    <link:label id="lab_us-gaap_OperatingIncomeLoss_9c067294-ab2c-44d7-a5c8-a6750b6d8baf_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating Income (Loss), Total</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingIncomeLoss" xlink:to="lab_us-gaap_OperatingIncomeLoss" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_NumberOfCommunitiesImpaired_0baf9cfe-de63-4fb8-b0c2-01a656fde30f_terseLabel_en-US" xlink:label="lab_sui_NumberOfCommunitiesImpaired" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of communities impaired</link:label>
    <link:label id="lab_sui_NumberOfCommunitiesImpaired_label_en-US" xlink:label="lab_sui_NumberOfCommunitiesImpaired" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Communities Impaired</link:label>
    <link:label id="lab_sui_NumberOfCommunitiesImpaired_documentation_en-US" xlink:label="lab_sui_NumberOfCommunitiesImpaired" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Communities Impaired</link:label>
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    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_9f76488d-219a-4513-a4ce-796db38be5be_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">2021</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finite-Lived Intangible Asset, Expected Amortization, Year Two</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues_a11f2660-c6e4-4d19-b0aa-dc71db5dca25_terseLabel_en-US" xlink:label="lab_us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary Equity, Stock Issued During Period, Value, New Issues</link:label>
    <link:label id="lab_us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues_label_en-US" xlink:label="lab_us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary Equity, Stock Issued During Period, Value, New Issues</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues" xlink:to="lab_us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_PropertiessecuringdebtMember_3646ebfd-3726-49c6-a40d-6fa823666120_terseLabel_en-US" xlink:label="lab_sui_PropertiessecuringdebtMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Properties securing debt [Member]</link:label>
    <link:label id="lab_sui_PropertiessecuringdebtMember_label_en-US" xlink:label="lab_sui_PropertiessecuringdebtMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Properties securing debt [Member]</link:label>
    <link:label id="lab_sui_PropertiessecuringdebtMember_documentation_en-US" xlink:label="lab_sui_PropertiessecuringdebtMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Properties securing debt [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_PropertiessecuringdebtMember" xlink:href="sui-20210630.xsd#sui_PropertiessecuringdebtMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_PropertiessecuringdebtMember" xlink:to="lab_sui_PropertiessecuringdebtMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_4c411640-5abe-42cd-a559-870d9e82f18a_verboseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash, cash equivalents and restricted cash</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_c5f66e8b-0f64-485b-b8a5-f8e40cd272c8_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash and Cash Equivalents, at Carrying Value</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_CabrilloIsleMember_14c44c71-30af-40cf-aea8-ae9cbb2ad1d5_terseLabel_en-US" xlink:label="lab_sui_CabrilloIsleMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cabrillo Isle</link:label>
    <link:label id="lab_sui_CabrilloIsleMember_label_en-US" xlink:label="lab_sui_CabrilloIsleMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cabrillo Isle [Member]</link:label>
    <link:label id="lab_sui_CabrilloIsleMember_documentation_en-US" xlink:label="lab_sui_CabrilloIsleMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cabrillo Isle</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_CabrilloIsleMember" xlink:href="sui-20210630.xsd#sui_CabrilloIsleMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_CabrilloIsleMember" xlink:to="lab_sui_CabrilloIsleMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_TaxWitholdingsonDistributionsfromInvestment_911323ab-e036-4337-a2ab-a70f13fa2e9b_terseLabel_en-US" xlink:label="lab_sui_TaxWitholdingsonDistributionsfromInvestment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax Witholdings on Distributions from Investment</link:label>
    <link:label id="lab_sui_TaxWitholdingsonDistributionsfromInvestment_label_en-US" xlink:label="lab_sui_TaxWitholdingsonDistributionsfromInvestment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax Witholdings on Distributions from Investment</link:label>
    <link:label id="lab_sui_TaxWitholdingsonDistributionsfromInvestment_documentation_en-US" xlink:label="lab_sui_TaxWitholdingsonDistributionsfromInvestment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tax Witholdings on Distributions from Investment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_TaxWitholdingsonDistributionsfromInvestment" xlink:href="sui-20210630.xsd#sui_TaxWitholdingsonDistributionsfromInvestment"/>
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    <link:label id="lab_sui_AwardDateFourMember_82e27b0d-fd7b-4536-b992-d7278455e4b9_terseLabel_en-US" xlink:label="lab_sui_AwardDateFourMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Award Date Four</link:label>
    <link:label id="lab_sui_AwardDateFourMember_label_en-US" xlink:label="lab_sui_AwardDateFourMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Award Date Four [Member]</link:label>
    <link:label id="lab_sui_AwardDateFourMember_documentation_en-US" xlink:label="lab_sui_AwardDateFourMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Award Date Four</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_AwardDateFourMember" xlink:href="sui-20210630.xsd#sui_AwardDateFourMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_AwardDateFourMember" xlink:to="lab_sui_AwardDateFourMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SeriesDPreferredStockMember_12cf9fc6-2972-43e8-9cb6-3346b03a9e1d_terseLabel_en-US" xlink:label="lab_us-gaap_SeriesDPreferredStockMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series D Preferred Stock [Member]</link:label>
    <link:label id="lab_us-gaap_SeriesDPreferredStockMember_label_en-US" xlink:label="lab_us-gaap_SeriesDPreferredStockMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Series D Preferred Stock [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesDPreferredStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SeriesDPreferredStockMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SeriesDPreferredStockMember" xlink:to="lab_us-gaap_SeriesDPreferredStockMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_CollateralizedReceivablesMember_022a6ff8-bf1b-4102-bdc0-3dfa527ddc55_terseLabel_en-US" xlink:label="lab_sui_CollateralizedReceivablesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collateralized Receivables [Member]</link:label>
    <link:label id="lab_sui_CollateralizedReceivablesMember_label_en-US" xlink:label="lab_sui_CollateralizedReceivablesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collateralized Receivables [Member]</link:label>
    <link:label id="lab_sui_CollateralizedReceivablesMember_documentation_en-US" xlink:label="lab_sui_CollateralizedReceivablesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Collateralized receivables [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_CollateralizedReceivablesMember" xlink:href="sui-20210630.xsd#sui_CollateralizedReceivablesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_CollateralizedReceivablesMember" xlink:to="lab_sui_CollateralizedReceivablesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_SafeHarborMember_f9e3b508-5cff-44bb-b6d4-9d95d1e95e9e_terseLabel_en-US" xlink:label="lab_sui_SafeHarborMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Safe Harbor</link:label>
    <link:label id="lab_sui_SafeHarborMember_label_en-US" xlink:label="lab_sui_SafeHarborMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Safe Harbor [Member]</link:label>
    <link:label id="lab_sui_SafeHarborMember_documentation_en-US" xlink:label="lab_sui_SafeHarborMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Safe Harbor</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_SafeHarborMember" xlink:href="sui-20210630.xsd#sui_SafeHarborMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_SafeHarborMember" xlink:to="lab_sui_SafeHarborMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LossFromCatastrophes_76a8f800-34f5-4d14-a453-4cd050476049_terseLabel_en-US" xlink:label="lab_us-gaap_LossFromCatastrophes" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Catastrophic event-related charges, net</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Liabilities" xlink:to="lab_us-gaap_Liabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_TemporaryEquityNetIncome_72c0bae1-3bce-451c-9df7-d5a3a0f593db_terseLabel_en-US" xlink:label="lab_us-gaap_TemporaryEquityNetIncome" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Net income / (loss)</link:label>
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    <link:label id="lab_sui_StockBasedCompensationAmortizationAndForfeitures_3325bffa-a161-410f-9429-d4242e2cb7a3_negatedTerseLabel_en-US" xlink:label="lab_sui_StockBasedCompensationAmortizationAndForfeitures" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Share-based compensation - amortization and forfeitures</link:label>
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    <link:label id="lab_sui_StockBasedCompensationAmortizationAndForfeitures_documentation_en-US" xlink:label="lab_sui_StockBasedCompensationAmortizationAndForfeitures" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock-Based Compensation Amortization And Forfeitures</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_StockBasedCompensationAmortizationAndForfeitures" xlink:href="sui-20210630.xsd#sui_StockBasedCompensationAmortizationAndForfeitures"/>
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    <link:label id="lab_sui_EquityMethodInvestmentsInitialFairValueAdjustment_c17030e6-1101-486f-a4a5-89d8d7a3cb52_terseLabel_en-US" xlink:label="lab_sui_EquityMethodInvestmentsInitialFairValueAdjustment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Method Investments, Initial Fair Value Adjustment</link:label>
    <link:label id="lab_sui_EquityMethodInvestmentsInitialFairValueAdjustment_label_en-US" xlink:label="lab_sui_EquityMethodInvestmentsInitialFairValueAdjustment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Method Investments, Initial Fair Value Adjustment</link:label>
    <link:label id="lab_sui_EquityMethodInvestmentsInitialFairValueAdjustment_documentation_en-US" xlink:label="lab_sui_EquityMethodInvestmentsInitialFairValueAdjustment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Method Investments, Initial Fair Value Adjustment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_EquityMethodInvestmentsInitialFairValueAdjustment" xlink:href="sui-20210630.xsd#sui_EquityMethodInvestmentsInitialFairValueAdjustment"/>
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    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_6fb7a149-249b-459c-9d90-8b25e09808ab_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finite-Lived Intangible Asset, Expected Amortization, Year One</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Finite-Lived Intangible Asset, Expected Amortization, Year One</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests_cbab71dd-dd50-45e8-bb1d-722464d28414_periodStartLabel_en-US" xlink:label="lab_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Beginning Balance</link:label>
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    <link:label id="lab_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests_label_en-US" xlink:label="lab_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests" xlink:to="lab_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests" xlink:type="arc" order="1"/>
    <link:label id="lab_srt_ConsolidationItemsAxis_b6b8face-2ed2-4ec4-ad0d-d1a24938318b_terseLabel_en-US" xlink:label="lab_srt_ConsolidationItemsAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Consolidation Items [Axis]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsAxis"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ConsolidationItemsAxis" xlink:to="lab_srt_ConsolidationItemsAxis" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_OperatingLeasesOfLessorDisclosureTextBlock_9ceaeedf-cdf1-4e1e-90a5-3e1be077f660_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesOfLessorDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leases</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesOfLessorDisclosureTextBlock_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesOfLessorDisclosureTextBlock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lessor, Operating Leases [Text Block]</link:label>
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    <link:label id="lab_us-gaap_CommonStockSharesIssued_6fb8a829-5c4c-4c17-a90f-580d484b4a24_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Stock, Shares Issued</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesIssued"/>
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    <link:label id="lab_us-gaap_PreferredStockSharesIssued_label_en-US" xlink:label="lab_us-gaap_PreferredStockSharesIssued" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred Stock, Shares Issued</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesIssued"/>
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    <link:label id="lab_sui_LeisurePointResortMember_e0e164d9-5267-49d5-a827-65c272724d0d_terseLabel_en-US" xlink:label="lab_sui_LeisurePointResortMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leisure Point Resort</link:label>
    <link:label id="lab_sui_LeisurePointResortMember_label_en-US" xlink:label="lab_sui_LeisurePointResortMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Leisure Point Resort [Member]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_sui_LeisurePointResortMember" xlink:href="sui-20210630.xsd#sui_LeisurePointResortMember"/>
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    <link:label id="lab_sui_OFallonMember_73c7c134-5efc-4bed-a384-e6d3c77b7f47_terseLabel_en-US" xlink:label="lab_sui_OFallonMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">O'Fallon</link:label>
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    <link:label id="lab_us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount_84a666ca-209a-43df-a2dd-bb38b5dee85d_terseLabel_en-US" xlink:label="lab_us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred OP units - mandatorily redeemable</link:label>
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    <link:label id="lab_sui_EquityMethodInvestmentFairValueAdjustment_fbc9a085-d5e7-488e-b91c-fbd837139b34_terseLabel_en-US" xlink:label="lab_sui_EquityMethodInvestmentFairValueAdjustment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Equity Method Investment, Fair Value Adjustment</link:label>
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    <link:label id="lab_us-gaap_DividendsPayableLineItems_0157afc4-29df-4b4d-9123-b1843f67f198_terseLabel_en-US" xlink:label="lab_us-gaap_DividendsPayableLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividends Payable [Line Items]</link:label>
    <link:label id="lab_us-gaap_DividendsPayableLineItems_label_en-US" xlink:label="lab_us-gaap_DividendsPayableLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Dividends Payable [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DividendsPayableLineItems"/>
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    <link:label id="lab_sui_OtherReceivablesStorageAndLeasePaymentsMarina_34019b05-c57a-4956-b15c-a5d8ff61a004_terseLabel_en-US" xlink:label="lab_sui_OtherReceivablesStorageAndLeasePaymentsMarina" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Receivables, Storage And Lease Payments, Marina</link:label>
    <link:label id="lab_sui_OtherReceivablesStorageAndLeasePaymentsMarina_label_en-US" xlink:label="lab_sui_OtherReceivablesStorageAndLeasePaymentsMarina" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Receivables, Storage And Lease Payments, Marina</link:label>
    <link:label id="lab_sui_OtherReceivablesStorageAndLeasePaymentsMarina_documentation_en-US" xlink:label="lab_sui_OtherReceivablesStorageAndLeasePaymentsMarina" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Other Receivables, Storage And Lease Payments, Marina</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_OtherReceivablesStorageAndLeasePaymentsMarina" xlink:href="sui-20210630.xsd#sui_OtherReceivablesStorageAndLeasePaymentsMarina"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_OtherReceivablesStorageAndLeasePaymentsMarina" xlink:to="lab_sui_OtherReceivablesStorageAndLeasePaymentsMarina" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_TranquilityMHCMember_3bca1503-2f63-4ba3-9d44-c8d06e1a63cc_terseLabel_en-US" xlink:label="lab_sui_TranquilityMHCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tranquility MHC</link:label>
    <link:label id="lab_sui_TranquilityMHCMember_label_en-US" xlink:label="lab_sui_TranquilityMHCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tranquility MHC [Member]</link:label>
    <link:label id="lab_sui_TranquilityMHCMember_documentation_en-US" xlink:label="lab_sui_TranquilityMHCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Tranquility MHC</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_TranquilityMHCMember" xlink:to="lab_sui_TranquilityMHCMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DomesticCountryMember_79112d03-ea9c-4f3a-a3b2-2fc245f348e6_terseLabel_en-US" xlink:label="lab_us-gaap_DomesticCountryMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Domestic Tax Authority [Member]</link:label>
    <link:label id="lab_us-gaap_DomesticCountryMember_label_en-US" xlink:label="lab_us-gaap_DomesticCountryMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Domestic Tax Authority [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DomesticCountryMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DomesticCountryMember" xlink:to="lab_us-gaap_DomesticCountryMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_RVMember_895fdccc-e59b-4df3-86e9-47ad6aaf01ca_terseLabel_en-US" xlink:label="lab_sui_RVMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">RV</link:label>
    <link:label id="lab_sui_RVMember_label_en-US" xlink:label="lab_sui_RVMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">RV [Member]</link:label>
    <link:label id="lab_sui_RVMember_documentation_en-US" xlink:label="lab_sui_RVMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">RV</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_RVMember" xlink:href="sui-20210630.xsd#sui_RVMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_RVMember" xlink:to="lab_sui_RVMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_IncomelossAttributabletoCommonStockholdersAllocableToNonVestedRestrictedShares_d7ced4f0-698b-4764-a959-6ba16028998c_terseLabel_en-US" xlink:label="lab_sui_IncomelossAttributabletoCommonStockholdersAllocableToNonVestedRestrictedShares" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Less: allocation to restricted stock awards</link:label>
    <link:label id="lab_sui_IncomelossAttributabletoCommonStockholdersAllocableToNonVestedRestrictedShares_label_en-US" xlink:label="lab_sui_IncomelossAttributabletoCommonStockholdersAllocableToNonVestedRestrictedShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income (loss) Attributable to Common Stockholders Allocable To Non Vested Restricted Shares</link:label>
    <link:label id="lab_sui_IncomelossAttributabletoCommonStockholdersAllocableToNonVestedRestrictedShares_documentation_en-US" xlink:label="lab_sui_IncomelossAttributabletoCommonStockholdersAllocableToNonVestedRestrictedShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income (Loss) From Continuing Operations Allocable To Non Vested Restricted Shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_IncomelossAttributabletoCommonStockholdersAllocableToNonVestedRestrictedShares" xlink:href="sui-20210630.xsd#sui_IncomelossAttributabletoCommonStockholdersAllocableToNonVestedRestrictedShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_IncomelossAttributabletoCommonStockholdersAllocableToNonVestedRestrictedShares" xlink:to="lab_sui_IncomelossAttributabletoCommonStockholdersAllocableToNonVestedRestrictedShares" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_NumberOfLandParcelsAcquiredAdjacentToExistingCommunities_144af30f-c53c-4e1d-b672-e9a6e6c05a4b_terseLabel_en-US" xlink:label="lab_sui_NumberOfLandParcelsAcquiredAdjacentToExistingCommunities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number Of Land Parcels Acquired Adjacent To Existing Communities</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_sui_NumberOfLandParcelsAcquiredAdjacentToExistingCommunities" xlink:href="sui-20210630.xsd#sui_NumberOfLandParcelsAcquiredAdjacentToExistingCommunities"/>
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    <link:label id="lab_us-gaap_DebtDisclosureAbstract_c2f52e3b-dec3-40ea-9b4d-f08ea0c7b734_terseLabel_en-US" xlink:label="lab_us-gaap_DebtDisclosureAbstract" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Disclosure [Abstract]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtDisclosureAbstract"/>
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    <link:label id="lab_dei_EntityAddressStateOrProvince_4b44f66f-a348-488f-8c97-a0f0bcb98b35_terseLabel_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, State or Province</link:label>
    <link:label id="lab_dei_EntityAddressStateOrProvince_label_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, State or Province</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressStateOrProvince"/>
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    <link:label id="lab_us-gaap_NotesReceivableFairValueDisclosure_facb4648-77cb-4adc-989a-1ef63e3e1483_terseLabel_en-US" xlink:label="lab_us-gaap_NotesReceivableFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes Receivable, Fair Value Disclosure</link:label>
    <link:label id="lab_us-gaap_NotesReceivableFairValueDisclosure_label_en-US" xlink:label="lab_us-gaap_NotesReceivableFairValueDisclosure" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Notes Receivable, Fair Value Disclosure</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableFairValueDisclosure" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NotesReceivableFairValueDisclosure"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NotesReceivableFairValueDisclosure" xlink:to="lab_us-gaap_NotesReceivableFairValueDisclosure" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_03e6fd96-af6d-4a0e-966e-43441d176c2f_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Property, Plant and Equipment, Type [Axis]</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-Lived Tangible Asset [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
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    <link:label id="lab_dei_EntityDomain_d6489865-7a52-4dfc-bb8e-566f0e175e0f_terseLabel_en-US" xlink:label="lab_dei_EntityDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity [Domain]</link:label>
    <link:label id="lab_dei_EntityDomain_label_en-US" xlink:label="lab_dei_EntityDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityDomain" xlink:to="lab_dei_EntityDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_OperatingAndFinanceLeasesLiabilityPaymentDue_42f7fe67-894e-47c0-8030-7dbbb67d85de_totalLabel_en-US" xlink:label="lab_sui_OperatingAndFinanceLeasesLiabilityPaymentDue" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating And Finance Leases, Liability, Payment, Due</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_sui_OperatingAndFinanceLeasesLiabilityPaymentDue" xlink:href="sui-20210630.xsd#sui_OperatingAndFinanceLeasesLiabilityPaymentDue"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_OperatingAndFinanceLeasesLiabilityPaymentDue" xlink:to="lab_sui_OperatingAndFinanceLeasesLiabilityPaymentDue" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_JellystoneAtBartonLakeMember_ac549fed-1711-4226-82e0-4a9c277c4e4e_terseLabel_en-US" xlink:label="lab_sui_JellystoneAtBartonLakeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Jellystone at Barton Lake</link:label>
    <link:label id="lab_sui_JellystoneAtBartonLakeMember_label_en-US" xlink:label="lab_sui_JellystoneAtBartonLakeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Jellystone at Barton Lake [Member]</link:label>
    <link:label id="lab_sui_JellystoneAtBartonLakeMember_documentation_en-US" xlink:label="lab_sui_JellystoneAtBartonLakeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Jellystone at Barton Lake</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_JellystoneAtBartonLakeMember" xlink:href="sui-20210630.xsd#sui_JellystoneAtBartonLakeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_JellystoneAtBartonLakeMember" xlink:to="lab_sui_JellystoneAtBartonLakeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_NumberofMHSites_f1515f98-daf2-45eb-a462-400f53d5e6a8_terseLabel_en-US" xlink:label="lab_sui_NumberofMHSites" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of MH sites (in sites)</link:label>
    <link:label id="lab_sui_NumberofMHSites_label_en-US" xlink:label="lab_sui_NumberofMHSites" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of MH Sites</link:label>
    <link:label id="lab_sui_NumberofMHSites_documentation_en-US" xlink:label="lab_sui_NumberofMHSites" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of MH Sites</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_NumberofMHSites" xlink:href="sui-20210630.xsd#sui_NumberofMHSites"/>
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    <link:label id="lab_sui_Debtweightedaveragetomaturitylength_4a49cb2e-5b08-4306-8c08-bf7daff68406_verboseLabel_en-US" xlink:label="lab_sui_Debtweightedaveragetomaturitylength" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt weighted average to maturity, years</link:label>
    <link:label id="lab_sui_Debtweightedaveragetomaturitylength_5b330941-d0ec-4635-b275-2a98b5e339bb_terseLabel_en-US" xlink:label="lab_sui_Debtweightedaveragetomaturitylength" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt weighted average to maturity, length</link:label>
    <link:label id="lab_sui_Debtweightedaveragetomaturitylength_label_en-US" xlink:label="lab_sui_Debtweightedaveragetomaturitylength" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt weighted average to maturity, length</link:label>
    <link:label id="lab_sui_Debtweightedaveragetomaturitylength_documentation_en-US" xlink:label="lab_sui_Debtweightedaveragetomaturitylength" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt weighted average to maturity, length</link:label>
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    <link:label id="lab_sui_ShelbyPropertiesMember_7918cce2-63d5-4d65-8c4f-39648de1bd12_terseLabel_en-US" xlink:label="lab_sui_ShelbyPropertiesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Shelby Properties</link:label>
    <link:label id="lab_sui_ShelbyPropertiesMember_label_en-US" xlink:label="lab_sui_ShelbyPropertiesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Shelby Properties [Member]</link:label>
    <link:label id="lab_sui_ShelbyPropertiesMember_documentation_en-US" xlink:label="lab_sui_ShelbyPropertiesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Shelby Properties [Member]</link:label>
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    <link:label id="lab_sui_SecuredDebtAndOtherBorrowings_ed0f76a1-6bc0-4a5d-b199-ddf0d9ae267a_terseLabel_en-US" xlink:label="lab_sui_SecuredDebtAndOtherBorrowings" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total debt</link:label>
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    <link:label id="lab_us-gaap_EarningsPerShareDiluted_ab9cc713-5e3e-41d6-8186-2c3c40bb9180_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareDiluted" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Per Share, Diluted</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareDiluted_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareDiluted" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Earnings Per Share, Diluted</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareDiluted" xlink:to="lab_us-gaap_EarningsPerShareDiluted" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_4824cb45-0166-45e6-9363-1e1a1ec2466d_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average common shares outstanding - basic</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_475cfc16-d78a-490f-9b9e-f3bec7ee3875_netLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted average common shares outstanding</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Basic</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:to="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SegmentDomain_1a46c265-1321-4338-8a34-0168cf8b672f_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Segments [Domain]</link:label>
    <link:label id="lab_us-gaap_SegmentDomain_label_en-US" xlink:label="lab_us-gaap_SegmentDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Segments [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SegmentDomain" xlink:to="lab_us-gaap_SegmentDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_5aed93bc-e117-4142-bf09-223f7f56209a_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Add: dilutive stock options</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Weighted Average Number Diluted Shares Outstanding Adjustment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment" xlink:to="lab_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_a172a4ed-0b82-4069-a60f-61833e983e5f_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash paid for income taxes</link:label>
    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Income Taxes Paid, Net</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxesPaidNet" xlink:to="lab_us-gaap_IncomeTaxesPaidNet" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_1a7630c1-4952-40c0-90de-8bdb4f0aca38_totalLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Comprehensive Income attributable to Sun Communities, Inc.</link:label>
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Comprehensive Income (Loss), Net of Tax, Attributable to Parent</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax" xlink:to="lab_us-gaap_ComprehensiveIncomeNetOfTax" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ContractWithCustomerLiability_f50d9526-509c-4aea-8d24-9c7a811bd23a_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiability" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Advanced reservation deposits and rent</link:label>
    <link:label id="lab_us-gaap_ContractWithCustomerLiability_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiability" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contract with Customer, Liability</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerLiability" xlink:to="lab_us-gaap_ContractWithCustomerLiability" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_SunMenifeeMember_8e14d872-27c7-4774-b773-5e98c21da677_terseLabel_en-US" xlink:label="lab_sui_SunMenifeeMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sun Menifee</link:label>
    <link:label id="lab_sui_SunMenifeeMember_label_en-US" xlink:label="lab_sui_SunMenifeeMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sun Menifee [Member]</link:label>
    <link:label id="lab_sui_SunMenifeeMember_documentation_en-US" xlink:label="lab_sui_SunMenifeeMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sun Menifee</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_SunMenifeeMember" xlink:href="sui-20210630.xsd#sui_SunMenifeeMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_SunMenifeeMember" xlink:to="lab_sui_SunMenifeeMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_NumberOfDevelopmentSites_49405ad1-bd42-4056-8ea2-5e4e94a1a360_terseLabel_en-US" xlink:label="lab_sui_NumberOfDevelopmentSites" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Development Sites</link:label>
    <link:label id="lab_sui_NumberOfDevelopmentSites_label_en-US" xlink:label="lab_sui_NumberOfDevelopmentSites" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Development Sites</link:label>
    <link:label id="lab_sui_NumberOfDevelopmentSites_documentation_en-US" xlink:label="lab_sui_NumberOfDevelopmentSites" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Development Sites</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_NumberOfDevelopmentSites" xlink:href="sui-20210630.xsd#sui_NumberOfDevelopmentSites"/>
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    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_7d570980-006f-4dbf-a5a5-a28479fd86cc_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of Common OP Units to common stock (in shares)</link:label>
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    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Issued During Period, Shares, Conversion of Convertible Securities</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" xlink:to="lab_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_NumberOfMarinasManaged_88f854d0-47b3-4e5d-a607-54f4f59bae02_terseLabel_en-US" xlink:label="lab_sui_NumberOfMarinasManaged" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of marinas managed (in marinas)</link:label>
    <link:label id="lab_sui_NumberOfMarinasManaged_label_en-US" xlink:label="lab_sui_NumberOfMarinasManaged" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Marinas Managed</link:label>
    <link:label id="lab_sui_NumberOfMarinasManaged_documentation_en-US" xlink:label="lab_sui_NumberOfMarinasManaged" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Marinas Managed</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_NumberOfMarinasManaged" xlink:href="sui-20210630.xsd#sui_NumberOfMarinasManaged"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_NumberOfMarinasManaged" xlink:to="lab_sui_NumberOfMarinasManaged" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_BusinessAcquisitionAcquireeDomain_a42e8feb-b45c-4361-a1f0-1dc0b2b4041e_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAcquireeDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Acquisition, Acquiree [Domain]</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionAcquireeDomain_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAcquireeDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Acquisition, Acquiree [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="lab_us-gaap_BusinessAcquisitionAcquireeDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_12360d89-3a4c-417b-924e-a94d01de6595_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment in property</link:label>
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    <link:label id="lab_us-gaap_ParentMember_c54432f8-1375-4bc0-87d2-fa3586cb8a7a_terseLabel_en-US" xlink:label="lab_us-gaap_ParentMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total Stockholders' Equity</link:label>
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    <link:label id="lab_sui_VariableInterestEntityEquityInterest_b41267de-2e68-4b33-9725-04f963274e0c_terseLabel_en-US" xlink:label="lab_sui_VariableInterestEntityEquityInterest" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Variable Interest Entity, Equity Interest</link:label>
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    <link:label id="lab_sui_LauderdaleMarineCenterMember_35b6632a-9bdd-468a-bc66-18d74c7d1a63_terseLabel_en-US" xlink:label="lab_sui_LauderdaleMarineCenterMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Lauderdale Marine Center</link:label>
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    <link:label id="lab_sui_AspenPreferredOpUnitsMember_0b622431-e6be-4933-9f72-95e719a6f7b8_terseLabel_en-US" xlink:label="lab_sui_AspenPreferredOpUnitsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Aspen Preferred OP Units [Member]</link:label>
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    <link:label id="lab_sui_ARFacilityMember_17cd3185-a79f-4978-9424-a905089446c5_terseLabel_en-US" xlink:label="lab_sui_ARFacilityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">A&amp;R Facility [Member]</link:label>
    <link:label id="lab_sui_ARFacilityMember_label_en-US" xlink:label="lab_sui_ARFacilityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">A&amp;R Facility [Member]</link:label>
    <link:label id="lab_sui_ARFacilityMember_documentation_en-US" xlink:label="lab_sui_ARFacilityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">A&amp;R Facility [Member]</link:label>
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    <link:label id="lab_us-gaap_LeaseCost_acc3e61f-79a0-4f3a-a807-10b889c72c1f_totalLabel_en-US" xlink:label="lab_us-gaap_LeaseCost" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total lease expense</link:label>
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    <link:label id="lab_us-gaap_ReclassificationsOfTemporaryToPermanentEquity_958049c0-b972-4fc1-9ceb-857915785482_terseLabel_en-US" xlink:label="lab_us-gaap_ReclassificationsOfTemporaryToPermanentEquity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Conversion of Series A-4 preferred stock</link:label>
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    <link:label id="lab_us-gaap_CustomerRelationshipsMember_cfa69a98-31e7-4dee-a61f-cd4a3086964c_terseLabel_en-US" xlink:label="lab_us-gaap_CustomerRelationshipsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Customer Relationships</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CustomerRelationshipsMember" xlink:to="lab_us-gaap_CustomerRelationshipsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_CherrystoneFamilyCampingMember_b75c6e6e-b388-4d61-9803-0fdd46c2f63e_terseLabel_en-US" xlink:label="lab_sui_CherrystoneFamilyCampingMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cherrystone Family Camping</link:label>
    <link:label id="lab_sui_CherrystoneFamilyCampingMember_label_en-US" xlink:label="lab_sui_CherrystoneFamilyCampingMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cherrystone Family Camping [Member]</link:label>
    <link:label id="lab_sui_CherrystoneFamilyCampingMember_documentation_en-US" xlink:label="lab_sui_CherrystoneFamilyCampingMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cherrystone Family Camping</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_CherrystoneFamilyCampingMember" xlink:href="sui-20210630.xsd#sui_CherrystoneFamilyCampingMember"/>
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    <link:label id="lab_sui_CountrysideVillageMember_86ff55d2-b46a-46ac-aa4a-5d7697382dca_terseLabel_en-US" xlink:label="lab_sui_CountrysideVillageMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Countryside Village</link:label>
    <link:label id="lab_sui_CountrysideVillageMember_label_en-US" xlink:label="lab_sui_CountrysideVillageMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Countryside Village [Member]</link:label>
    <link:label id="lab_sui_CountrysideVillageMember_documentation_en-US" xlink:label="lab_sui_CountrysideVillageMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Countryside Village</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_CountrysideVillageMember" xlink:href="sui-20210630.xsd#sui_CountrysideVillageMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_CountrysideVillageMember" xlink:to="lab_sui_CountrysideVillageMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_FurnitureAndFixturesGross_2565c850-f9bb-4720-ac3a-453c1444b20f_terseLabel_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesGross" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Furniture, fixtures and equipment</link:label>
    <link:label id="lab_us-gaap_FurnitureAndFixturesGross_label_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesGross" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Furniture and Fixtures, Gross</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesGross" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FurnitureAndFixturesGross"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FurnitureAndFixturesGross" xlink:to="lab_us-gaap_FurnitureAndFixturesGross" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LossContingenciesLineItems_de0ecd8c-3c8d-4cea-8207-628db0c6b13d_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingenciesLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Loss Contingencies [Line Items]</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossContingenciesLineItems" xlink:to="lab_us-gaap_LossContingenciesLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_ContingentConsiderationLiabilityMember_72c9f941-7e8a-4cdb-b6fe-bb7bcaa97e59_terseLabel_en-US" xlink:label="lab_sui_ContingentConsiderationLiabilityMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contingent Consideration Liability</link:label>
    <link:label id="lab_sui_ContingentConsiderationLiabilityMember_label_en-US" xlink:label="lab_sui_ContingentConsiderationLiabilityMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contingent Consideration Liability [Member]</link:label>
    <link:label id="lab_sui_ContingentConsiderationLiabilityMember_documentation_en-US" xlink:label="lab_sui_ContingentConsiderationLiabilityMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Contingent Consideration Liability</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_ContingentConsiderationLiabilityMember" xlink:href="sui-20210630.xsd#sui_ContingentConsiderationLiabilityMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_ContingentConsiderationLiabilityMember" xlink:to="lab_sui_ContingentConsiderationLiabilityMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_9eb3d543-458e-4f1c-ad9b-321222c47946_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt" xlink:to="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_d366942a-50e9-48a0-b8d9-521dfcc50db9_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentLineItems" xlink:to="lab_us-gaap_DebtInstrumentLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_MarinasMember_2f8d2249-ffe1-4d13-9efc-f44ce11f39c7_terseLabel_en-US" xlink:label="lab_sui_MarinasMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Marinas</link:label>
    <link:label id="lab_sui_MarinasMember_label_en-US" xlink:label="lab_sui_MarinasMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Marinas [Member]</link:label>
    <link:label id="lab_sui_MarinasMember_documentation_en-US" xlink:label="lab_sui_MarinasMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Marinas</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_MarinasMember" xlink:href="sui-20210630.xsd#sui_MarinasMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_MarinasMember" xlink:to="lab_sui_MarinasMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_CapitalLeaseObligations_e03eabb0-cc87-4b4a-ac46-7ad195719778_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeaseObligations" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital Lease Obligations</link:label>
    <link:label id="lab_us-gaap_CapitalLeaseObligations_label_en-US" xlink:label="lab_us-gaap_CapitalLeaseObligations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Capital Lease Obligations</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalLeaseObligations" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalLeaseObligations"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeaseObligations" xlink:to="lab_us-gaap_CapitalLeaseObligations" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_BelowMarketLeasesMember_4b888d44-87df-4c84-85cc-07e136e1c304_terseLabel_en-US" xlink:label="lab_sui_BelowMarketLeasesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Below Market Leases</link:label>
    <link:label id="lab_sui_BelowMarketLeasesMember_label_en-US" xlink:label="lab_sui_BelowMarketLeasesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Below Market Leases [Member]</link:label>
    <link:label id="lab_sui_BelowMarketLeasesMember_documentation_en-US" xlink:label="lab_sui_BelowMarketLeasesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Below Market Leases [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_BelowMarketLeasesMember" xlink:href="sui-20210630.xsd#sui_BelowMarketLeasesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_BelowMarketLeasesMember" xlink:to="lab_sui_BelowMarketLeasesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_ScheduleOfNotesAndOtherReceivablesTableTextBlock_a3f633a9-f555-42d4-892d-6005e983a238_terseLabel_en-US" xlink:label="lab_sui_ScheduleOfNotesAndOtherReceivablesTableTextBlock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Schedule of notes and other receivables</link:label>
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    <link:label id="lab_us-gaap_BusinessAcquisitionsProFormaRevenue_56c927b2-660c-47e0-a96a-ca0998272034_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionsProFormaRevenue" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Total revenues</link:label>
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    <link:label id="lab_sui_InvestmentFairValueAdjustment_documentation_en-US" xlink:label="lab_sui_InvestmentFairValueAdjustment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Investment, Fair Value Adjustment</link:label>
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    <link:label id="lab_sui_NGSunLLCMember_7887f538-91c4-4b84-80ed-829120504780_terseLabel_en-US" xlink:label="lab_sui_NGSunLLCMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">NG Sun LLC [Member]</link:label>
    <link:label id="lab_sui_NGSunLLCMember_label_en-US" xlink:label="lab_sui_NGSunLLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">NG Sun LLC [Member]</link:label>
    <link:label id="lab_sui_NGSunLLCMember_documentation_en-US" xlink:label="lab_sui_NGSunLLCMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">NG Sun LLC [Member]</link:label>
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    <link:label id="lab_sui_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_6759e065-3fec-45a9-a352-e80b89f7c932_terseLabel_en-US" xlink:label="lab_sui_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt</link:label>
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    <link:label id="lab_sui_RevenueFromHomeSalesMember_f353705b-d99d-4775-85c6-e0aa86792ed2_terseLabel_en-US" xlink:label="lab_sui_RevenueFromHomeSalesMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue From Home Sales [Member]</link:label>
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    <link:label id="lab_sui_RevenueFromHomeSalesMember_documentation_en-US" xlink:label="lab_sui_RevenueFromHomeSalesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue From Home Sales [Member]</link:label>
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    <link:label id="lab_sui_RevenueFromHomeSales_a9b393bf-7f89-44ec-8c55-1b9714e0b009_terseLabel_en-US" xlink:label="lab_sui_RevenueFromHomeSales" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Home sales</link:label>
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    <link:label id="lab_sui_RevenueFromHomeSales_documentation_en-US" xlink:label="lab_sui_RevenueFromHomeSales" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Revenue from home sales.</link:label>
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    <link:label id="lab_dei_DocumentQuarterlyReport_29ffb2c6-0dde-48cd-8cad-cc09fdc38855_terseLabel_en-US" xlink:label="lab_dei_DocumentQuarterlyReport" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Quarterly Report</link:label>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_c407daff-80e1-4b18-8b97-d0658239751d_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of Credit Facility, Current Borrowing Capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of Credit Facility, Current Borrowing Capacity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity"/>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityTable_a3b31bcb-b22a-41aa-b1ee-622029048c71_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityTable" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of Credit Facility [Table]</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityTable_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityTable" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of Credit Facility [Table]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityTable" xlink:to="lab_us-gaap_LineOfCreditFacilityTable" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_Brokeragecommissionsandotherincomenet_335d9d19-4b77-473e-b743-106f5fff7e6a_terseLabel_en-US" xlink:label="lab_sui_Brokeragecommissionsandotherincomenet" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Brokerage commissions and other, net</link:label>
    <link:label id="lab_sui_Brokeragecommissionsandotherincomenet_label_en-US" xlink:label="lab_sui_Brokeragecommissionsandotherincomenet" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Brokerage commissions and other income, net</link:label>
    <link:label id="lab_sui_Brokeragecommissionsandotherincomenet_documentation_en-US" xlink:label="lab_sui_Brokeragecommissionsandotherincomenet" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Includes brokerage commissions, gain (loss) on sale of land, and other - net</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_Brokeragecommissionsandotherincomenet" xlink:to="lab_sui_Brokeragecommissionsandotherincomenet" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_IntangibleAssetsNetIncludingGoodwill_35444d0b-2924-455e-b62a-31f20b74f90c_terseLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsNetIncludingGoodwill" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Intangible Assets, Net (Including Goodwill)</link:label>
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    <link:label id="lab_sui_NumberofUnitsinRealEstatePropertyDevelopmentSites_af6b0a1b-6725-4519-98a3-aaf27ec3e2e6_terseLabel_en-US" xlink:label="lab_sui_NumberofUnitsinRealEstatePropertyDevelopmentSites" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Development Sites</link:label>
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    <link:label id="lab_sui_NumberofUnitsinRealEstatePropertyDevelopmentSites_documentation_en-US" xlink:label="lab_sui_NumberofUnitsinRealEstatePropertyDevelopmentSites" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Number of Units in Real Estate Property, Development Sites</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_NumberofUnitsinRealEstatePropertyDevelopmentSites" xlink:href="sui-20210630.xsd#sui_NumberofUnitsinRealEstatePropertyDevelopmentSites"/>
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    <link:label id="lab_sui_SungeniaJVMember_da29be55-7704-408c-b455-ed464856d594_terseLabel_en-US" xlink:label="lab_sui_SungeniaJVMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sungenia JV [Member]</link:label>
    <link:label id="lab_sui_SungeniaJVMember_label_en-US" xlink:label="lab_sui_SungeniaJVMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sungenia JV [Member]</link:label>
    <link:label id="lab_sui_SungeniaJVMember_documentation_en-US" xlink:label="lab_sui_SungeniaJVMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sungenia JV [Member]</link:label>
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    <link:label id="lab_sui_StockIssuedDuringPeriodValueNewIssuesSeriesA3PreferredOPUnits_acd77f06-55c3-427e-bdcc-bf40b771f5ce_terseLabel_en-US" xlink:label="lab_sui_StockIssuedDuringPeriodValueNewIssuesSeriesA3PreferredOPUnits" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Issued During Period, Value, New Issues, Series A-3 Preferred OP Units</link:label>
    <link:label id="lab_sui_StockIssuedDuringPeriodValueNewIssuesSeriesA3PreferredOPUnits_label_en-US" xlink:label="lab_sui_StockIssuedDuringPeriodValueNewIssuesSeriesA3PreferredOPUnits" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Issued During Period, Value, New Issues, Series A-3 Preferred OP Units</link:label>
    <link:label id="lab_sui_StockIssuedDuringPeriodValueNewIssuesSeriesA3PreferredOPUnits_documentation_en-US" xlink:label="lab_sui_StockIssuedDuringPeriodValueNewIssuesSeriesA3PreferredOPUnits" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Stock Issued During Period, Value, New Issues, Series A-3 Preferred OP Units</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_StockIssuedDuringPeriodValueNewIssuesSeriesA3PreferredOPUnits" xlink:href="sui-20210630.xsd#sui_StockIssuedDuringPeriodValueNewIssuesSeriesA3PreferredOPUnits"/>
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    <link:label id="lab_sui_SVLiftMember_aa084822-dba1-490c-a8f0-e1bfddcefa77_terseLabel_en-US" xlink:label="lab_sui_SVLiftMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">SV Lift [Member]</link:label>
    <link:label id="lab_sui_SVLiftMember_label_en-US" xlink:label="lab_sui_SVLiftMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">SV Lift [Member]</link:label>
    <link:label id="lab_sui_SVLiftMember_documentation_en-US" xlink:label="lab_sui_SVLiftMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">SV Lift [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_SVLiftMember" xlink:href="sui-20210630.xsd#sui_SVLiftMember"/>
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    <link:label id="lab_us-gaap_LongtermNotesAndLoansByTypeCurrentAndNoncurrentAbstract_label_en-US" xlink:label="lab_us-gaap_LongtermNotesAndLoansByTypeCurrentAndNoncurrentAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Long-term Notes and Loans, by Type, Current and Noncurrent [Abstract]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermNotesAndLoansByTypeCurrentAndNoncurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermNotesAndLoansByTypeCurrentAndNoncurrentAbstract"/>
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    <link:label id="lab_sui_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsLiabilitiesInventory_9d1893b2-6e91-4ec1-aa11-b3d9b9b0d96d_terseLabel_en-US" xlink:label="lab_sui_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsLiabilitiesInventory" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">In-place leases, goodwill and other intangible assets</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsLiabilitiesInventory" xlink:to="lab_sui_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsLiabilitiesInventory" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateDuringPeriod_7e9820c7-a006-4ff7-9261-5aa810564c4a_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateDuringPeriod" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument, Interest Rate During Period</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod"/>
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    <link:label id="lab_sui_AllenHarborMember_f70c8a05-86ca-439e-8e1c-dc3f85d3bfc3_terseLabel_en-US" xlink:label="lab_sui_AllenHarborMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Allen Harbor</link:label>
    <link:label id="lab_sui_AllenHarborMember_label_en-US" xlink:label="lab_sui_AllenHarborMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Allen Harbor [Member]</link:label>
    <link:label id="lab_sui_AllenHarborMember_documentation_en-US" xlink:label="lab_sui_AllenHarborMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Allen Harbor</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_AllenHarborMember" xlink:href="sui-20210630.xsd#sui_AllenHarborMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_AllenHarborMember" xlink:to="lab_sui_AllenHarborMember" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_SunOutdoorsMember_0dccb713-bcc9-4b10-945e-dc6fc1ce599f_terseLabel_en-US" xlink:label="lab_sui_SunOutdoorsMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sun Outdoors</link:label>
    <link:label id="lab_sui_SunOutdoorsMember_label_en-US" xlink:label="lab_sui_SunOutdoorsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sun Outdoors [Member]</link:label>
    <link:label id="lab_sui_SunOutdoorsMember_documentation_en-US" xlink:label="lab_sui_SunOutdoorsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Sun Outdoors</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_SunOutdoorsMember" xlink:href="sui-20210630.xsd#sui_SunOutdoorsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_SunOutdoorsMember" xlink:to="lab_sui_SunOutdoorsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_ClassOfStockDomain_de448d75-035d-402f-9991-ff9270c1148c_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfStockDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Class of Stock [Domain]</link:label>
    <link:label id="lab_us-gaap_ClassOfStockDomain_label_en-US" xlink:label="lab_us-gaap_ClassOfStockDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Class of Stock [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfStockDomain" xlink:to="lab_us-gaap_ClassOfStockDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_977ca706-793d-4fe1-acdd-d3b96b00a8a4_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payments of dividends</link:label>
    <link:label id="lab_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payments of Ordinary Dividends, Preferred Stock and Preference Stock</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock" xlink:to="lab_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesGross_57c03fcc-0df8-4abb-a0a7-115837ece24b_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesGross" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash and escrow</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesGross_b6299ef2-9343-4290-992b-b94a5a337d5f_verboseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesGross" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cash paid for RV community acquired</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesGross_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesGross" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Payments to Acquire Businesses, Gross</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireBusinessesGross" xlink:to="lab_us-gaap_PaymentsToAcquireBusinessesGross" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_GlenEllisMember_5fa34140-629d-428e-b690-6bd21acf388d_terseLabel_en-US" xlink:label="lab_sui_GlenEllisMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Crown Villa</link:label>
    <link:label id="lab_sui_GlenEllisMember_label_en-US" xlink:label="lab_sui_GlenEllisMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Glen Ellis [Member]</link:label>
    <link:label id="lab_sui_GlenEllisMember_documentation_en-US" xlink:label="lab_sui_GlenEllisMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Glen Ellis [Member]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_GlenEllisMember" xlink:href="sui-20210630.xsd#sui_GlenEllisMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_GlenEllisMember" xlink:to="lab_sui_GlenEllisMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_9409a5cc-6b02-4da8-a38a-c2c0bab6757f_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of credit, borrowing capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_SafeHarborRybovichMember_49406aa6-821f-40ac-a733-37f3f187270e_terseLabel_en-US" xlink:label="lab_sui_SafeHarborRybovichMember" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Safe Harbor Rybovich</link:label>
    <link:label id="lab_sui_SafeHarborRybovichMember_label_en-US" xlink:label="lab_sui_SafeHarborRybovichMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Safe Harbor Rybovich [Member]</link:label>
    <link:label id="lab_sui_SafeHarborRybovichMember_documentation_en-US" xlink:label="lab_sui_SafeHarborRybovichMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Safe Harbor Rybovich</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_SafeHarborRybovichMember" xlink:href="sui-20210630.xsd#sui_SafeHarborRybovichMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sui_SafeHarborRybovichMember" xlink:to="lab_sui_SafeHarborRybovichMember" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_SegmentReportingInformationLineItems_22be74df-1872-4c5d-8ac8-c0ac4e8f73be_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentReportingInformationLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Segment Reporting Information [Line Items]</link:label>
    <link:label id="lab_us-gaap_SegmentReportingInformationLineItems_label_en-US" xlink:label="lab_us-gaap_SegmentReportingInformationLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Segment Reporting Information [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems" xlink:to="lab_us-gaap_SegmentReportingInformationLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_AccountsPayableCurrentAndNoncurrent_1e798afe-e27e-4ebf-a8fa-2624ba08d6c1_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrentAndNoncurrent" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts Payable</link:label>
    <link:label id="lab_us-gaap_AccountsPayableCurrentAndNoncurrent_label_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrentAndNoncurrent" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Accounts Payable</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrentAndNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsPayableCurrentAndNoncurrent"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsPayableCurrentAndNoncurrent" xlink:to="lab_us-gaap_AccountsPayableCurrentAndNoncurrent" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_LineOfCreditFacilityLineItems_c1d9efa3-39f3-4184-b02c-b30637a64e73_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityLineItems" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of Credit Facility [Line Items]</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityLineItems_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityLineItems" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Line of Credit Facility [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems" xlink:to="lab_us-gaap_LineOfCreditFacilityLineItems" xlink:type="arc" order="1"/>
    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_677a2c89-f11d-4a29-8219-e4de169c0bb5_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentNameDomain" xlink:to="lab_us-gaap_DebtInstrumentNameDomain" xlink:type="arc" order="1"/>
    <link:label id="lab_sui_OperatingAndFinanceLeasePayments_a343228b-e14b-4486-81a0-48b36dac4cb2_totalLabel_en-US" xlink:label="lab_sui_OperatingAndFinanceLeasePayments" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating And Finance Lease, Payments</link:label>
    <link:label id="lab_sui_OperatingAndFinanceLeasePayments_label_en-US" xlink:label="lab_sui_OperatingAndFinanceLeasePayments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating And Finance Lease, Payments</link:label>
    <link:label id="lab_sui_OperatingAndFinanceLeasePayments_documentation_en-US" xlink:label="lab_sui_OperatingAndFinanceLeasePayments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Operating And Finance Lease, Payments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sui_OperatingAndFinanceLeasePayments" xlink:href="sui-20210630.xsd#sui_OperatingAndFinanceLeasePayments"/>
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