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  <xs:element id="o_SeniorUnsecuredNotesPayableDueOctober2026SecondIssuanceMarch2017Member" abstract="true" name="SeniorUnsecuredNotesPayableDueOctober2026SecondIssuanceMarch2017Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="o_DebtInstrumentOfferingPricePercentage" abstract="false" name="DebtInstrumentOfferingPricePercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="o_NoteReceivableOther" abstract="false" name="NoteReceivableOther" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="o_ProceedsFromLongTermLinesOfCreditAndIssuanceOfCommercialPaper" abstract="false" name="ProceedsFromLongTermLinesOfCreditAndIssuanceOfCommercialPaper" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="o_SeniorUnsecuredNotesPayable1800DueMarch2033Member" abstract="true" name="SeniorUnsecuredNotesPayable1800DueMarch2033Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="o_PaymentsToAcquireBusinessesRepaymentOfDebt" abstract="false" name="PaymentsToAcquireBusinessesRepaymentOfDebt" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="o_SeniorUnsecuredNotesPayable2500DueJanuary2042Member" abstract="true" name="SeniorUnsecuredNotesPayable2500DueJanuary2042Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="o_ProceedsFromSaleOfPropertyHeldForSaleIncludingPropertySwapNet" abstract="false" name="ProceedsFromSaleOfPropertyHeldForSaleIncludingPropertySwapNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="o_BusinessCombinationConsiderationTransferredEquityBasedAwardsAttributableToPrecombinationServices" abstract="false" name="BusinessCombinationConsiderationTransferredEquityBasedAwardsAttributableToPrecombinationServices" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="o_MortgagesRepaidInFullMember" abstract="true" name="MortgagesRepaidInFullMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="o_FiniteLivedIntangibleAssetsRentalIncomeIncreaseDecreaseYearTwo" abstract="false" name="FiniteLivedIntangibleAssetsRentalIncomeIncreaseDecreaseYearTwo" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="o_NoncontrollingInterestIncreaseFromContributions" abstract="false" name="NoncontrollingInterestIncreaseFromContributions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="o_SecuredOvernightFinancingRateSOFRMember" abstract="true" name="SecuredOvernightFinancingRateSOFRMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="o_BondsPayableDueMarch2035FirstIssuanceMarch2005Member" abstract="true" name="BondsPayableDueMarch2035FirstIssuanceMarch2005Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="o_ProceedsFromTheAtTheMarketStockPurchaseProgram" abstract="false" name="ProceedsFromTheAtTheMarketStockPurchaseProgram" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="o_RealEstatePropertiesAcquiredLandRightOfUseAssetsUnderLongTermGroundLeases" abstract="false" name="RealEstatePropertiesAcquiredLandRightOfUseAssetsUnderLongTermGroundLeases" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="o_PartnershipUnitsNumberIssuedDuringPeriod" abstract="false" name="PartnershipUnitsNumberIssuedDuringPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="o_PropertiesAcquiredRealEstateInvestmentsTextBlock" abstract="false" name="PropertiesAcquiredRealEstateInvestmentsTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="o_AssetAcquisitionProFormaInformationEarningsOrLossOfAcquiredPropertiesSinceAcquisitionDateActual" abstract="false" name="AssetAcquisitionProFormaInformationEarningsOrLossOfAcquiredPropertiesSinceAcquisitionDateActual" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="o_LineOfCreditFacilityBasisSpreadAndCommitmentFeeTotal" abstract="false" name="LineOfCreditFacilityBasisSpreadAndCommitmentFeeTotal" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
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  <xs:element id="o_PaymentsOfStockIssuanceCostsOtherOfferingExpenses" abstract="false" name="PaymentsOfStockIssuanceCostsOtherOfferingExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="o_CommercialPaperProgramMaximumAggregateCapacity" abstract="false" name="CommercialPaperProgramMaximumAggregateCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="o_PropertySalesCount" abstract="false" name="PropertySalesCount" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
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  <xs:element id="o_BusinessCombinationRecognizedIdentifiableAssetAcquiredAndLiabilityAssumedLeaseIntangibleLiability" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetAcquiredAndLiabilityAssumedLeaseIntangibleLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="o_PaymentsOfStockIssuanceCostsSalesAgentCommission" abstract="false" name="PaymentsOfStockIssuanceCostsSalesAgentCommission" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="o_ImpairedPropertiesHeldForSaleNumber" abstract="false" name="ImpairedPropertiesHeldForSaleNumber" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
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  <xs:element id="o_NumberOfDevelopmentJointVenturesAcquired" abstract="false" name="NumberOfDevelopmentJointVenturesAcquired" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="o_AccruedMergerCosts" abstract="false" name="AccruedMergerCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="o_RealEstatePropertiesAcquiredOtherAssetsLoanReceivables" abstract="false" name="RealEstatePropertiesAcquiredOtherAssetsLoanReceivables" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="o_GainLossOnForeignCurrencyAndDerivativeNetRealized" abstract="false" name="GainLossOnForeignCurrencyAndDerivativeNetRealized" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="o_UnrealizedGainLossRemeasurementCertainAssetsAndLiabilities" abstract="false" name="UnrealizedGainLossRemeasurementCertainAssetsAndLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="o_PaymentsToAcquireBusinessesFractionalShares" abstract="false" name="PaymentsToAcquireBusinessesFractionalShares" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="o_GainLossOnForeignCurrencyAndDerivativeNet" abstract="false" name="GainLossOnForeignCurrencyAndDerivativeNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="o_IncreaseDecreaseInFairValueOfDerivativesNet" abstract="false" name="IncreaseDecreaseInFairValueOfDerivativesNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="o_RealEstatePropertyInvestmentsNumberOfNewProperties" abstract="false" name="RealEstatePropertyInvestmentsNumberOfNewProperties" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
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  <xs:element id="o_RealEstatePropertiesAcquiredOtherAssets" abstract="false" name="RealEstatePropertiesAcquiredOtherAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="o_RealEstatePropertiesAcquiredOtherAssetsRightOfUseAssetsOperatingLongTermGroundLeases" abstract="false" name="RealEstatePropertiesAcquiredOtherAssetsRightOfUseAssetsOperatingLongTermGroundLeases" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="o_RealEstatePropertiesAcquiredOtherLiabilitiesMortgageDiscounts" abstract="false" name="RealEstatePropertiesAcquiredOtherLiabilitiesMortgageDiscounts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="o_InvestmentBuildingAndBuildingImprovementsAfterImpairment" abstract="false" name="InvestmentBuildingAndBuildingImprovementsAfterImpairment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="o_DebtInstrumentAmountExchanged" abstract="false" name="DebtInstrumentAmountExchanged" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="o_DebtInstrumentBasisSpreadOnVariableRateAdjustmentCharge" abstract="false" name="DebtInstrumentBasisSpreadOnVariableRateAdjustmentCharge" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="o_PropertiesOccupiedByApplicableTenantAssociatedWithMortgages" abstract="false" name="PropertiesOccupiedByApplicableTenantAssociatedWithMortgages" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
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  <xs:element id="o_ImpairedPropertiesSoldNumber" abstract="false" name="ImpairedPropertiesSoldNumber" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
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  <xs:element id="o_DebtInstrumentCovenantDebtToTotalAdjustedAssetsRatio" abstract="false" name="DebtInstrumentCovenantDebtToTotalAdjustedAssetsRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="o_BusinessCombinationProFormaInformationRevenueOfAcquireeActual" abstract="false" name="BusinessCombinationProFormaInformationRevenueOfAcquireeActual" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="o_SettlementCreditsForAcquiredPropertiesAsReimbursementForRentFreePeriod" abstract="false" name="SettlementCreditsForAcquiredPropertiesAsReimbursementForRentFreePeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="o_BusinessCombinationConsiderationTransferredNoncashConsiderationTotal" abstract="false" name="BusinessCombinationConsiderationTransferredNoncashConsiderationTotal" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="o_SharePriceDividendAdjustment" abstract="false" name="SharePriceDividendAdjustment" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="o_LineOfCreditFacilityContingentExpansionOptionAdditionalBorrowingCapacity" abstract="false" name="LineOfCreditFacilityContingentExpansionOptionAdditionalBorrowingCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="o_GainLossOnForeignCurrencyAndDerivativeNetUnrealized" abstract="false" name="GainLossOnForeignCurrencyAndDerivativeNetUnrealized" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="o_SingleClientPropertiesPercentage" abstract="false" name="SingleClientPropertiesPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="o_ReLeasingCostsRecurringCapitalExpendituresNonRecurringBuildingImprovementsMember" abstract="true" name="ReLeasingCostsRecurringCapitalExpendituresNonRecurringBuildingImprovementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="o_ScheduleOfMinorityInterestRollForwardTableTextBlock" abstract="false" name="ScheduleOfMinorityInterestRollForwardTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="o_ScheduleOfAcquiredLeaseIntangibleLiabilitiesTableTextBlock" abstract="false" name="ScheduleOfAcquiredLeaseIntangibleLiabilitiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
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</xs:schema>
