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  <xs:element id="slg_OperatingPartnershipNoncontrollingInterestFairValueAdjustment" abstract="false" name="OperatingPartnershipNoncontrollingInterestFairValueAdjustment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ConsolidationOfASubsidiary" abstract="false" name="ConsolidationOfASubsidiary" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_InvestmentInJointVenture" abstract="false" name="InvestmentInJointVenture" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_DeconsolidationRealEstateInvestments" abstract="false" name="DeconsolidationRealEstateInvestments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_DeconsolidationOfSubsidiaryMortgage" abstract="false" name="DeconsolidationOfSubsidiaryMortgage" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_DebtAndPreferredEquityReserves" abstract="false" name="DebtAndPreferredEquityReserves" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ExtinguishmentOfDebtInConnectionWithPropertyDispositions" abstract="false" name="ExtinguishmentOfDebtInConnectionWithPropertyDispositions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_RemovalofFullyDepreciatedRealEstateAssets" abstract="false" name="RemovalofFullyDepreciatedRealEstateAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_IncreaseDecreaseinNoncontrollingInterestinJointVentures" abstract="false" name="IncreaseDecreaseinNoncontrollingInterestinJointVentures" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ShareRepurchasesOrRedemptionPayable" abstract="false" name="ShareRepurchasesOrRedemptionPayable" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ConsolidationOfSecuritizationVehicleAssets" abstract="false" name="ConsolidationOfSecuritizationVehicleAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ConsolidationOfSecuritizationVehicleLiabilities" abstract="false" name="ConsolidationOfSecuritizationVehicleLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_GeneralAndLimitedPartnersCapitalAccount" abstract="false" name="GeneralAndLimitedPartnersCapitalAccount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_LimitedPartnershipUnitsHeldByGeneralPartner" abstract="false" name="LimitedPartnershipUnitsHeldByGeneralPartner" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="slg_NetIncomeLossAllocatedToCommonUnitholders" abstract="false" name="NetIncomeLossAllocatedToCommonUnitholders" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ProfitLossLessPreferredDistributions" abstract="false" name="ProfitLossLessPreferredDistributions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_OtherComprehensiveIncomeLossNetofTaxLessPortionAttributabletoNoncontrollingInterest" abstract="false" name="OtherComprehensiveIncomeLossNetofTaxLessPortionAttributabletoNoncontrollingInterest" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_DistributionsPreferredUnits" abstract="false" name="DistributionsPreferredUnits" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_UnitDividendsUnits" abstract="false" name="UnitDividendsUnits" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="slg_PartnersCapitalAccountValueUnitDividend" abstract="false" name="PartnersCapitalAccountValueUnitDividend" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_IssuanceOfSpecialDistributionPaidPrimarilyInUnits" abstract="false" name="IssuanceOfSpecialDistributionPaidPrimarilyInUnits" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_MeasurementAdjustmentForRedeemableNoncontrollingInterestNoncashInvestingAndFinancingActivities" abstract="false" name="MeasurementAdjustmentForRedeemableNoncontrollingInterestNoncashInvestingAndFinancingActivities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_DeferredFinancingAndLeasingCostsDisclosureTextBlock" abstract="false" name="DeferredFinancingAndLeasingCostsDisclosureTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_MortgagesAndOtherLoansPayableDisclosureAbstract" abstract="true" name="MortgagesAndOtherLoansPayableDisclosureAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_InvestmentInRealEstatePolicyTextBlock" abstract="false" name="InvestmentInRealEstatePolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_RestrictedCashPolicyTextBlock" abstract="false" name="RestrictedCashPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_InvestmentInCMBSSecuritizationTrustsPolicyTextBlock" abstract="false" name="InvestmentInCMBSSecuritizationTrustsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_DeferredLeaseCostsPolicyTextBlock" abstract="false" name="DeferredLeaseCostsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_DeferredFinancingCostsPolicyTextBlock" abstract="false" name="DeferredFinancingCostsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_DebtAndPreferredEquityInvestmentsPolicyTextBlock" abstract="false" name="DebtAndPreferredEquityInvestmentsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_RentExpensePolicyTextBlock" abstract="false" name="RentExpensePolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_UnderwritingCommissionsandCostsPolicyPolicyTextBlock" abstract="false" name="UnderwritingCommissionsandCostsPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_TransactionCostsPolicyTextBlock" abstract="false" name="TransactionCostsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_EarningsPerUnitPolicyPolicyTextBlock" abstract="false" name="EarningsPerUnitPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_ScheduleOfIntangibleAssetsAndLiabilitiesTableTextBlock" abstract="false" name="ScheduleOfIntangibleAssetsAndLiabilitiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_ScheduleOfAcquiredAboveMarketAndBelowMarketLeasesFutureAmortizationExpenseTableTextBlock" abstract="false" name="ScheduleOfAcquiredAboveMarketAndBelowMarketLeasesFutureAmortizationExpenseTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_ScheduleOfOtherIdentifiableAssetsFutureAmortizationExpenseTableTextBlock" abstract="false" name="ScheduleOfOtherIdentifiableAssetsFutureAmortizationExpenseTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_ScheduleOfDebtAndPreferredEquityBookBalanceRollForwardTableTextBlock" abstract="false" name="ScheduleOfDebtAndPreferredEquityBookBalanceRollForwardTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_ScheduleOfInvestmentInFinancingReceivablesAndRiskRatingTableTextBlock" abstract="false" name="ScheduleOfInvestmentInFinancingReceivablesAndRiskRatingTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_ScheduleOfMortgageLoansOnRealEstateTableTextBlock" abstract="false" name="ScheduleOfMortgageLoansOnRealEstateTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_ScheduleOfMortgageAndOtherLoansPayableOnJointVenturePropertiesTableTextBlock" abstract="false" name="ScheduleOfMortgageAndOtherLoansPayableOnJointVenturePropertiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_EquityMethodInvestmentsSummarizedFinancialInformationBalanceSheetTableTextBlock" abstract="false" name="EquityMethodInvestmentsSummarizedFinancialInformationBalanceSheetTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_EquityMethodInvestmentsSummarizedFinancialInformationIncomeStatementTableTextBlock" abstract="false" name="EquityMethodInvestmentsSummarizedFinancialInformationIncomeStatementTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_ScheduleOfDeferredCostsTableTextBlock" abstract="false" name="ScheduleOfDeferredCostsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_MortgageAndOtherLoansPayableTableTextBlock" abstract="false" name="MortgageAndOtherLoansPayableTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_ScheduleofCommonStockIssuedandProceedsReceivedDividendReinvestmentsTableTextBlock" abstract="false" name="ScheduleofCommonStockIssuedandProceedsReceivedDividendReinvestmentsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_ScheduleofCalculationofNumeratorandDenominatorinEarningsPerUnitTableTextBlock" abstract="false" name="ScheduleofCalculationofNumeratorandDenominatorinEarningsPerUnitTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_ScheduleOfSalesTypeLeasesTableTextBlock" abstract="false" name="ScheduleOfSalesTypeLeasesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_ScheduleOfGroundLeaseArrangementsTableTextBlock" abstract="false" name="ScheduleOfGroundLeaseArrangementsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="slg_ScheduleOfOwnershipInterestsTable" abstract="true" name="ScheduleOfOwnershipInterestsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="slg_ServiceCorporationMember" abstract="true" name="ServiceCorporationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_SLGManagementLLCMember" abstract="true" name="SLGManagementLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_OperatingPartnershipMember" abstract="true" name="OperatingPartnershipMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_SLGreenManagementMember" abstract="true" name="SLGreenManagementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_ManagedOfficePropertiesMember" abstract="true" name="ManagedOfficePropertiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_ParkAvenue500Member" abstract="true" name="ParkAvenue500Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_MortgageToFinanceAcquisitionMember" abstract="true" name="MortgageToFinanceAcquisitionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_OwnershipInterestsLineItems" abstract="true" name="OwnershipInterestsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_NumberofRealEstateBuildings" abstract="false" name="NumberofRealEstateBuildings" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_MortgageLoansOnRealEstateCommercialAndConsumerNetIncludingDebtInvestmentsOther" abstract="false" name="MortgageLoansOnRealEstateCommercialAndConsumerNetIncludingDebtInvestmentsOther" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_DebtInvestmentsOther" abstract="false" name="DebtInvestmentsOther" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_NumberOfSharesOnRedemptionOfOneUnitOfPartnershipInterest" abstract="false" name="NumberOfSharesOnRedemptionOfOneUnitOfPartnershipInterest" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="slg_CommercialPropertyMember" abstract="true" name="CommercialPropertyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_OfficePropertiesMember" abstract="true" name="OfficePropertiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_RetailPropertiesMember" abstract="true" name="RetailPropertiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_DevelopmentPropertiesMember" abstract="true" name="DevelopmentPropertiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_CorePortfolioMember" abstract="true" name="CorePortfolioMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_AlternativeStrategyPortfolioMember" abstract="true" name="AlternativeStrategyPortfolioMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_RealEstateByLocationAxis" abstract="true" name="RealEstateByLocationAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="slg_RealEstateByLocationDomain" abstract="true" name="RealEstateByLocationDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_ManhattanMember" abstract="true" name="ManhattanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_SuburbanMember" abstract="true" name="SuburbanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_A7Dey185BroadwayMember" abstract="true" name="A7Dey185BroadwayMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_RealEstateWeightedAverageLeasedOccupancy" abstract="false" name="RealEstateWeightedAverageLeasedOccupancy" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="slg_LeasesBelowMarketMember" abstract="true" name="LeasesBelowMarketMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_InPlaceLeasesMember" abstract="true" name="InPlaceLeasesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_AndrewMathiasMember" abstract="true" name="AndrewMathiasMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_SevenOneNineSeventhAvenueMember" abstract="true" name="SevenOneNineSeventhAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_A760MadisonAvenueMember" abstract="true" name="A760MadisonAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_WeightedAverageAmortizationPeriodAboveMarketLeaseCosts" abstract="false" name="WeightedAverageAmortizationPeriodAboveMarketLeaseCosts" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_WeightedAverageAmortizationPeriodBelowMarketLeaseCosts" abstract="false" name="WeightedAverageAmortizationPeriodBelowMarketLeaseCosts" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_WeightedAverageAmortizationPeriodInPlaceLeaseCosts" abstract="false" name="WeightedAverageAmortizationPeriodInPlaceLeaseCosts" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_PeriodFromCessationOfMajorConstructionActivityToCompletionOfConstructionProjectMaximum" abstract="false" name="PeriodFromCessationOfMajorConstructionActivityToCompletionOfConstructionProjectMaximum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_BuildingFeeOwnershipMember" abstract="true" name="BuildingFeeOwnershipMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_BuildingLeaseholdInterestMember" abstract="true" name="BuildingLeaseholdInterestMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_RightOfUseAssetsFinancingLeaseMember" abstract="true" name="RightOfUseAssetsFinancingLeaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_A690MadisonAvenueMember" abstract="true" name="A690MadisonAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_CommercialRealEstatePropertiesDepreciationandAmortization" abstract="false" name="CommercialRealEstatePropertiesDepreciationandAmortization" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_DisposalGroupIncludingDiscontinuedOperationOwnershipInterestDisposed" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationOwnershipInterestDisposed" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="slg_ReductionOfOwnershipPercentage" abstract="false" name="ReductionOfOwnershipPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization" abstract="false" name="RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_FinitelyLivedIntangibleAssetsAbstract" abstract="true" name="FinitelyLivedIntangibleAssetsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_FiniteLivedIntangibleLiabilitiesAbstract" abstract="true" name="FiniteLivedIntangibleLiabilitiesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_FiniteLivedIntangibleLiabilitiesGross" abstract="false" name="FiniteLivedIntangibleLiabilitiesGross" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization" abstract="false" name="FiniteLivedIntangibleLiabilitiesAccumulatedAmortization" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_FiniteLivedIntangibleLiabilitiesNet" abstract="false" name="FiniteLivedIntangibleLiabilitiesNet" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_OtherIdentifiableAssetsMember" abstract="true" name="OtherIdentifiableAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="slg_DebtSecuritiesAvailableForSaleNumberOfPositions" abstract="false" name="DebtSecuritiesAvailableForSaleNumberOfPositions" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_DebtSecuritiesAvailableForSaleUnrealizedGainFairMarketValue" abstract="false" name="DebtSecuritiesAvailableForSaleUnrealizedGainFairMarketValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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