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  <xsd:element name="AvalonCarpetTileAndFlooringRetailStoreAndWarehouseDeptfordNewJerseyMember" id="olp_AvalonCarpetTileAndFlooringRetailStoreAndWarehouseDeptfordNewJerseyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BRTRealtyTrustMember" id="olp_BRTRealtyTrustMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BaltimoreMDMember" id="olp_BaltimoreMDMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BastropLAMember" id="olp_BastropLAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BataviaNYMember" id="olp_BataviaNYMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BlufftonSCMember" id="olp_BlufftonSCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BoardOfDirectorsViceChairmanMember" id="olp_BoardOfDirectorsViceChairmanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BolingbrookILMember" id="olp_BolingbrookILMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BrooklynNYMember" id="olp_BrooklynNYMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax" id="olp_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax" id="olp_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="RetailPropertyFortMillSouthCarolinaMember" id="olp_RetailPropertyFortMillSouthCarolinaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CaryNCMember" id="olp_CaryNCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ChampaignILMember" id="olp_ChampaignILMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RetailPropertyRoundRockTexasMember" id="olp_RetailPropertyRoundRockTexasMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestaurantPropertyKilleenTexasMember" id="olp_RestaurantPropertyKilleenTexasMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestaurantPropertyConcordNorthCarolinaMember" id="olp_RestaurantPropertyConcordNorthCarolinaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CherryHillNJMember" id="olp_CherryHillNJMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ChicagoILMember" id="olp_ChicagoILMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ColumbusOHMember" id="olp_ColumbusOHMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommonStockDividendDistributionDisclosureTextBlock" id="olp_CommonStockDividendDistributionDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommonStockDividendsCashPaidCapitalGainPercentage" id="olp_CommonStockDividendsCashPaidCapitalGainPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConcentrationRiskRealEstateInvestmentsAsPercentageOfDepreciatedBookValue" id="olp_ConcentrationRiskRealEstateInvestmentsAsPercentageOfDepreciatedBookValue" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MortgagePrepaymentPenalty" id="olp_MortgagePrepaymentPenalty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ConsolidatedJointVentureMember" id="olp_ConsolidatedJointVentureMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CostsOfAcquiringRealEstate" id="olp_CostsOfAcquiringRealEstate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="CrystalLakeILMember" id="olp_CrystalLakeILMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentExcessOfEstimatedFairValueOverCarryingValue" id="olp_DebtInstrumentExcessOfEstimatedFairValueOverCarryingValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="DebtInstrumentInterestRateFloor" id="olp_DebtInstrumentInterestRateFloor" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentMaturityDateLengthOfExtensionPeriod" id="olp_DebtInstrumentMaturityDateLengthOfExtensionPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentOutstandingNumber" id="olp_DebtInstrumentOutstandingNumber" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentWeightedAverageRemainingTerm" id="olp_DebtInstrumentWeightedAverageRemainingTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredRentReceivableAbstract" id="olp_DeferredRentReceivableAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredRentReceivablePeriodDuringWhichAmountOfRentToBeBilledAndReceived" id="olp_DeferredRentReceivablePeriodDuringWhichAmountOfRentToBeBilledAndReceived" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredRentReceivableWrittenOff" id="olp_DeferredRentReceivableWrittenOff" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DeferredRentReceivableWrittenOffRelatingToPropertySold" id="olp_DeferredRentReceivableWrittenOffRelatingToPropertySold" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DeferredRentReceivableWrittenOffRelatingToPropertyVacatedByFormerTenant" id="olp_DeferredRentReceivableWrittenOffRelatingToPropertyVacatedByFormerTenant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DeferredRentReceivablesRelatedToPropertyHeldForSale" id="olp_DeferredRentReceivablesRelatedToPropertyHeldForSale" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DenverCOMember" id="olp_DenverCOMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GainOnSalesOfRealEstateAndOtherAssets" id="olp_GainOnSalesOfRealEstateAndOtherAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxCashFlowImpact" id="olp_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxCashFlowImpact" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DiscontinuedOperationNumberOfPropertiesSoldWhoseNetGainAndOperationsAreIncludedInDiscontinuedOperations" id="olp_DiscontinuedOperationNumberOfPropertiesSoldWhoseNetGainAndOperationsAreIncludedInDiscontinuedOperations" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DiscontinuedOperationsNumberOfPropertiesSold" id="olp_DiscontinuedOperationsNumberOfPropertiesSold" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses" id="olp_DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DividendPaidDeductionFromTaxableIncome" id="olp_DividendPaidDeductionFromTaxableIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DividendReinvestmentPlanCommonStockDiscountOnShares" id="olp_DividendReinvestmentPlanCommonStockDiscountOnShares" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReclassificationAbstract" id="olp_ReclassificationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DividendsBeforeAdjustmentsForPreviousAndCurrentYear" id="olp_DividendsBeforeAdjustmentsForPreviousAndCurrentYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DividendsDesignatedFromFollowingYear" id="olp_DividendsDesignatedFromFollowingYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DividendsDesignatedToPreviousYear" id="olp_DividendsDesignatedToPreviousYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DlbervilleMSMember" id="olp_DlbervilleMSMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DocumentAndEntityInformationAbstract" id="olp_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DuluthGAMember" id="olp_DuluthGAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DurhamNCMember" id="olp_DurhamNCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ElPasoTX1Member" id="olp_ElPasoTX1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ElPasoTX2Member" id="olp_ElPasoTX2Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquityMethodInvestmentIncomeFromNetSettlementWithFormerTenant" id="olp_EquityMethodInvestmentIncomeFromNetSettlementWithFormerTenant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="EscrowDepositsAndOtherAssetsAndReceivables" id="olp_EscrowDepositsAndOtherAssetsAndReceivables" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="EugeneORMember" id="olp_EugeneORMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EverettMAMember" id="olp_EverettMAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FayettevilleGAMember" id="olp_FayettevilleGAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FedExFacilityPinellasParkFloridaMember" id="olp_FedExFacilityPinellasParkFloridaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FlexMember" id="olp_FlexMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FlowoodMSMember" id="olp_FlowoodMSMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FtMyersFLMember" id="olp_FtMyersFLMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GainOnSettlementOfDebtAbstract" id="olp_GainOnSettlementOfDebtAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GainOnSettlementOfDebtTextBlock" id="olp_GainOnSettlementOfDebtTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GettysburgPAMember" id="olp_GettysburgPAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GouldInvestorsLPMember" id="olp_GouldInvestorsLPMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GrandRapidsMI1Member" id="olp_GrandRapidsMI1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GrandRapidsMI2Member" id="olp_GrandRapidsMI2Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GreensboroNCMember" id="olp_GreensboroNCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GurneeILMember" id="olp_GurneeILMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="HamiltonOHMember" id="olp_HamiltonOHMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="HanoverPAMember" id="olp_HanoverPAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="HauppaugeNYMember" id="olp_HauppaugeNYMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="HavertyFurnitureCompaniesIncMember" id="olp_HavertyFurnitureCompaniesIncMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LAFitnessHealthClubHamiltonOhioMember" id="olp_LAFitnessHealthClubHamiltonOhioMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="HealthClubsMember" id="olp_HealthClubsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="HoustonTX1Member" id="olp_HoustonTX1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="HoustonTX2Member" id="olp_HoustonTX2Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="HoustonTX3Member" id="olp_HoustonTX3Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="HyannisMAMember" id="olp_HyannisMAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncentivePlan2003Member" id="olp_IncentivePlan2003Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncentivePlan2009Member" id="olp_IncentivePlan2009Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncentivePlan2012Member" id="olp_IncentivePlan2012Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxLineItems" id="olp_IncomeTaxLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxesAbstract" id="olp_IncomeTaxesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxesTable" id="olp_IncomeTaxesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncrementalCommonSharesNotIncludedInComputationOfEarningPerShare" id="olp_IncrementalCommonSharesNotIncludedInComputationOfEarningPerShare" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InterestRateSwapDueApril2016Member" id="olp_InterestRateSwapDueApril2016Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InterestRateSwapDueAugust2016Member" id="olp_InterestRateSwapDueAugust2016Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InterestRateSwapDueDecember2014Member" id="olp_InterestRateSwapDueDecember2014Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InterestRateSwapDueFebruary2019Member" id="olp_InterestRateSwapDueFebruary2019Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InterestRateSwapDueMarch2017Member" id="olp_InterestRateSwapDueMarch2017Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InterestRateSwapDueNovember2020Member" id="olp_InterestRateSwapDueNovember2020Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InterestRateSwapDueJanuary2023Member" id="olp_InterestRateSwapDueJanuary2023Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InvestmentInRelatedParty" id="olp_InvestmentInRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="InvestmentMaximumPercentageOfVotingPowerOfRelatedPartyHeld" id="olp_InvestmentMaximumPercentageOfVotingPowerOfRelatedPartyHeld" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InvestmentsInUnconsolidatedJointVentureTextBlock" id="olp_InvestmentsInUnconsolidatedJointVentureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InvestmentsInUnconsolidatedJointVenturesAbstract" id="olp_InvestmentsInUnconsolidatedJointVenturesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IslandParkNYMember" id="olp_IslandParkNYMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="KansasCityMOMember" id="olp_KansasCityMOMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="KentwoodLAMember" id="olp_KentwoodLAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="KnoxvilleTNMember" id="olp_KnoxvilleTNMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LakeCharlesLAMember" id="olp_LakeCharlesLAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LeaseholdRent" id="olp_LeaseholdRent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="LexingtonKYMember" id="olp_LexingtonKYMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LineOfCreditFacilityCommitmentAndExtensionFeeAmount" id="olp_LineOfCreditFacilityCommitmentAndExtensionFeeAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="LineOfCreditFacilityMaximumBorrowingCapacityPercentageAvailableForSpecificPurposeOtherThanForTradePurchases" id="olp_LineOfCreditFacilityMaximumBorrowingCapacityPercentageAvailableForSpecificPurposeOtherThanForTradePurchases" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="LineOfCreditFacilityVariableRateBaseLIBORRateMember" id="olp_LineOfCreditFacilityVariableRateBaseLIBORRateMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MajesticPropertyManagementCorpMember" id="olp_MajesticPropertyManagementCorpMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MarstonMillsMAMember" id="olp_MarstonMillsMAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumAggregateSalesPriceOfSharesToBeSoldUnderEquityOfferingProgram" id="olp_MaximumAggregateSalesPriceOfSharesToBeSoldUnderEquityOfferingProgram" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="MelvilleNYMember" id="olp_MelvilleNYMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MonroeLA1Member" id="olp_MonroeLA1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MonroeLA2Member" id="olp_MonroeLA2Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MonroevillePAMember" id="olp_MonroevillePAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NoncashAllocationOfIntangibleLeaseLiability" id="olp_NoncashAllocationOfIntangibleLeaseLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="MortgagesAndLoanMember" id="olp_MortgagesAndLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NaplesFLMember" id="olp_NaplesFLMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NetIncomeLossFromContinuingOperationsAvailableToCommonStockholders" id="olp_NetIncomeLossFromContinuingOperationsAvailableToCommonStockholders" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="NewHydeParkNYMember" id="olp_NewHydeParkNYMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NewarkDEMember" id="olp_NewarkDEMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NewportNewsVAMember" id="olp_NewportNewsVAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NilesILMember" id="olp_NilesILMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NoncashAllocationOfIntangibleLeaseAssets" id="olp_NoncashAllocationOfIntangibleLeaseAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="NumberOfDerivativeAgreementsInWhichParentCompanyCouldBeLiableInEventOfSubsidiaryDefault" id="olp_NumberOfDerivativeAgreementsInWhichParentCompanyCouldBeLiableInEventOfSubsidiaryDefault" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfMortgagesToBeRepaidFromProceedsOfPublicOffering" id="olp_NumberOfMortgagesToBeRepaidFromProceedsOfPublicOffering" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfPropertiesOwnedAndOperatedByEachUnconsolidatedJointVenture" id="olp_NumberOfPropertiesOwnedAndOperatedByEachUnconsolidatedJointVenture" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfRealEstatePropertiesAcquired" id="olp_NumberOfRealEstatePropertiesAcquired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfRealEstatePropertiesSold" id="olp_NumberOfRealEstatePropertiesSold" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfTenantSpacesAtTheProperty" id="olp_NumberOfTenantSpacesAtTheProperty" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfUnconsolidatedJointVentures" id="olp_NumberOfUnconsolidatedJointVentures" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfUnconsolidatedJointVenturesWithDerivativesOutstanding" id="olp_NumberOfUnconsolidatedJointVenturesWithDerivativesOutstanding" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfVacantProperties" id="olp_NumberOfVacantProperties" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OnalaskaWIMember" id="olp_OnalaskaWIMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesAnnualFixedRent" id="olp_OperatingLeasesAnnualFixedRent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesExtensionPeriodFirstFiveRenewalOptions" id="olp_OperatingLeasesExtensionPeriodFirstFiveRenewalOptions" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesExtensionPeriodLastRenewalOption" id="olp_OperatingLeasesExtensionPeriodLastRenewalOption" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesFrequencyForIncreaseInRent" id="olp_OperatingLeasesFrequencyForIncreaseInRent" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesNumberOfFiveYearExtensionOptions" id="olp_OperatingLeasesNumberOfFiveYearExtensionOptions" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesNumberOfSevenMonthsExtensionOptions" id="olp_OperatingLeasesNumberOfSevenMonthsExtensionOptions" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesPercentageIncreaseInRentEveryFiveYears" id="olp_OperatingLeasesPercentageIncreaseInRentEveryFiveYears" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTaxTheCompanyShareFromJointVenture" id="olp_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTaxTheCompanyShareFromJointVenture" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="OtherPropertiesMember" id="olp_OtherPropertiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PalmyraPAMember" id="olp_PalmyraPAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ParsippanyNJMember" id="olp_ParsippanyNJMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PayForPerformanceProgramMember" id="olp_PayForPerformanceProgramMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfRestrictedStockUnitsExcludedFromSummary" id="olp_NumberOfRestrictedStockUnitsExcludedFromSummary" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PaymentOfCommissionsOnSaleOfShares" id="olp_PaymentOfCommissionsOnSaleOfShares" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PaymentOfOfferingCostsOnSaleOfShares" id="olp_PaymentOfOfferingCostsOnSaleOfShares" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PaymentsOfAmortizationOfMortgagesPayable" id="olp_PaymentsOfAmortizationOfMortgagesPayable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfDiscountOnCommonStockPurchasedThroughDividendReinvestmentPlan" id="olp_PercentageOfDiscountOnCommonStockPurchasedThroughDividendReinvestmentPlan" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PhiladelphiaPAMember" id="olp_PhiladelphiaPAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PrepaidLeaseholdImprovements" id="olp_PrepaidLeaseholdImprovements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PriorPlansMember" id="olp_PriorPlansMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PropertyInNewYorkMember" id="olp_PropertyInNewYorkMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PublicOfferingDisclosureAbstract" id="olp_PublicOfferingDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PublicOfferingDisclosureTextBlock" id="olp_PublicOfferingDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReadingPA1Member" id="olp_ReadingPA1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReadingPA2Member" id="olp_ReadingPA2Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstateAcquisitionAbstract" id="olp_RealEstateAcquisitionAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstateAcquisitionTextBlock" id="olp_RealEstateAcquisitionTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstateAndAccumulatedDepreciationNumberOfPropertiesContainingCrossDefaultProvisions" id="olp_RealEstateAndAccumulatedDepreciationNumberOfPropertiesContainingCrossDefaultProvisions" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RealEstateAndAccumulatedDepreciationNumberOfPropertiesCoveredByOneMasterLeaseAndOneLoanSecuredByCrossCollateralizedMortgages" id="olp_RealEstateAndAccumulatedDepreciationNumberOfPropertiesCoveredByOneMasterLeaseAndOneLoanSecuredByCrossCollateralizedMortgages" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RealEstateAndAccumulatedDepreciationNumberOfPropertiesNetLeasedToSameTenantUnderSeparateLeases" id="olp_RealEstateAndAccumulatedDepreciationNumberOfPropertiesNetLeasedToSameTenantUnderSeparateLeases" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RealEstateAndAccumulatedDepreciationNumberOfStatesInWhichPropertiesContainingCrossDefaultProvisionsLocated" id="olp_RealEstateAndAccumulatedDepreciationNumberOfStatesInWhichPropertiesContainingCrossDefaultProvisionsLocated" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RealEstateAndAccumulatedDepreciationNumberStatesInWhichPropertiesCoveredByOneMasterLeaseAndOneLoanSecuredByCrossCollateralizedMortgagesLocated" id="olp_RealEstateAndAccumulatedDepreciationNumberStatesInWhichPropertiesCoveredByOneMasterLeaseAndOneLoanSecuredByCrossCollateralizedMortgagesLocated" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RealEstateCostsAndExpensesRelatedParty" id="olp_RealEstateCostsAndExpensesRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RealEstateFederalIncomeTaxBasisDifferenceAmount" id="olp_RealEstateFederalIncomeTaxBasisDifferenceAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="RealEstateInvestmentsAndMinimumFutureRentalsDisclosureAbstract" id="olp_RealEstateInvestmentsAndMinimumFutureRentalsDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstateInvestmentsAndMinimumFutureRentalsDisclosureTextBlock" id="olp_RealEstateInvestmentsAndMinimumFutureRentalsDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstatePropertiesAcquisitionOccupancyPercentage" id="olp_RealEstatePropertiesAcquisitionOccupancyPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReclassificationOfPrepaidAllowanceToPropertiesImprovement" id="olp_ReclassificationOfPrepaidAllowanceToPropertiesImprovement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ReconciliationOfCashDividendsPaidToDividendsPaidDeductionAbstract" id="olp_ReconciliationOfCashDividendsPaidToDividendsPaidDeductionAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReconciliationOfIncomeFromBookBasisToTaxBasisAbstract" id="olp_ReconciliationOfIncomeFromBookBasisToTaxBasisAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReconciliationOfIncomeFromBookBasisToTaxBasisDepreciationAndAmortization" id="olp_ReconciliationOfIncomeFromBookBasisToTaxBasisDepreciationAndAmortization" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReconciliationOfIncomeFromBookBasisToTaxBasisFinancialStatementAdjustmentForAboveAndBelowMarketLeases" id="olp_ReconciliationOfIncomeFromBookBasisToTaxBasisFinancialStatementAdjustmentForAboveAndBelowMarketLeases" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReconciliationOfIncomeFromBookBasisToTaxBasisGainOnSalesOfProperties" id="olp_ReconciliationOfIncomeFromBookBasisToTaxBasisGainOnSalesOfProperties" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReconciliationOfIncomeFromBookBasisToTaxBasisNonDeductibleShareBasedCompensationCost" id="olp_ReconciliationOfIncomeFromBookBasisToTaxBasisNonDeductibleShareBasedCompensationCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReconciliationOfIncomeFromBookBasisToTaxBasisOtherAdjustments" id="olp_ReconciliationOfIncomeFromBookBasisToTaxBasisOtherAdjustments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReconciliationOfIncomeFromBookBasisToTaxBasisProfitLossTaxBasis" id="olp_ReconciliationOfIncomeFromBookBasisToTaxBasisProfitLossTaxBasis" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReconciliationOfIncomeFromBookBasisToTaxBasisPropertyAcquisitionCostCapitalizedForTaxPurpose" id="olp_ReconciliationOfIncomeFromBookBasisToTaxBasisPropertyAcquisitionCostCapitalizedForTaxPurpose" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReconciliationOfIncomeFromBookBasisToTaxBasisRentAdjustment" id="olp_ReconciliationOfIncomeFromBookBasisToTaxBasisRentAdjustment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="MortgageLoanMaturingOnMarch2024Member" id="olp_MortgageLoanMaturingOnMarch2024Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReconciliationOfIncomeFromBookBasisToTaxBasisRentalIncomeAdvanceNet" id="olp_ReconciliationOfIncomeFromBookBasisToTaxBasisRentalIncomeAdvanceNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReductionToLandAndBuildingsDueToReceiptOfRentalReserveFromSeller" id="olp_ReductionToLandAndBuildingsDueToReceiptOfRentalReserveFromSeller" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyTransactionAdditionalAmountAuthorizedUnderCompensationAndServicesAgreement" id="olp_RelatedPartyTransactionAdditionalAmountAuthorizedUnderCompensationAndServicesAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionAdditionalPaymentForShareOfDirectOfficeExpenses" id="olp_RelatedPartyTransactionAdditionalPaymentForShareOfDirectOfficeExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionAmountAgreedToBePaid" id="olp_RelatedPartyTransactionAmountAgreedToBePaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionAmountAuthorizedUnderCompensationAndServicesAgreement" id="olp_RelatedPartyTransactionAmountAuthorizedUnderCompensationAndServicesAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionAnnualFeesPaidForServices" id="olp_RelatedPartyTransactionAnnualFeesPaidForServices" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionPropertyManagementCostAllocatedToRealEstateExpensesAnnually" id="olp_RelatedPartyTransactionPropertyManagementCostAllocatedToRealEstateExpensesAnnually" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionOwnershipPercentageHeld" id="olp_RelatedPartyTransactionOwnershipPercentageHeld" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RentalRevenueMember" id="olp_RentalRevenueMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RevenuesIncludingRevenueFromDiscontinuedOperationsAsPreviouslyReported" id="olp_RevenuesIncludingRevenueFromDiscontinuedOperationsAsPreviouslyReported" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="RichmondVAMember" id="olp_RichmondVAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RonkonkomaNYMember" id="olp_RonkonkomaNYMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RosenbergTXMember" id="olp_RosenbergTXMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RoyersfordPAMember" id="olp_RoyersfordPAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SacoMEMember" id="olp_SacoMEMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfExpectedAmortizationOfDeferredOriginationCostsTableTextBlock" id="olp_ScheduleOfExpectedAmortizationOfDeferredOriginationCostsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfOperatingLeasesFutureMinimumPaymentsReceivableTableTextBlock" id="olp_ScheduleOfOperatingLeasesFutureMinimumPaymentsReceivableTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfRealEstateAcquisitionsDuringPeriodTableTextBlock" id="olp_ScheduleOfRealEstateAcquisitionsDuringPeriodTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfReconciliationOfCashDividendsPaidToDividendPaidDeductionTableTextBlock" id="olp_ScheduleOfReconciliationOfCashDividendsPaidToDividendPaidDeductionTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfReconciliationOfIncomeFromBookBasisToTaxBasisTableTextBlock" id="olp_ScheduleOfReconciliationOfIncomeFromBookBasisToTaxBasisTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeattleWAMember" id="olp_SeattleWAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeldenNYMember" id="olp_SeldenNYMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SettlementOfMortgageDebt" id="olp_SettlementOfMortgageDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesToBeVestedAndIssuedForEachOutstandingUnitOnSatisfyingPerformanceCriteria" id="olp_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesToBeVestedAndIssuedForEachOutstandingUnitOnSatisfyingPerformanceCriteria" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardWeightedAverageAwardVestingPeriod" id="olp_ShareBasedCompensationArrangementByShareBasedPaymentAwardWeightedAverageAwardVestingPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShoppingCenterHoustonTexasMember" id="olp_ShoppingCenterHoustonTexasMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SomervilleMAMember" id="olp_SomervilleMAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockDividendObligation" id="olp_StockDividendObligation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="SubsequentDisqualificationPeriodIfFailedToQualifyAsREIT" id="olp_SubsequentDisqualificationPeriodIfFailedToQualifyAsREIT" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SubsidiaryOfGouldInvestorsLPMember" id="olp_SubsidiaryOfGouldInvestorsLPMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TheatreMember" id="olp_TheatreMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ThreeApplebeeRestaurantsCarrolltonKennesawAndCartersvilleGeorgiaMember" id="olp_ThreeApplebeeRestaurantsCarrolltonKennesawAndCartersvilleGeorgiaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrammellCrowCompanyMember" id="olp_TrammellCrowCompanyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrexlertownPAMember" id="olp_TrexlertownPAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TuckerGAMember" id="olp_TuckerGAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TylerTXMember" id="olp_TylerTXMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UnamortizedIntangibleLeaseAssets" id="olp_UnamortizedIntangibleLeaseAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="UnconsolidatedJointVentureInPlanoTexasMember" id="olp_UnconsolidatedJointVentureInPlanoTexasMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UnconsolidatedJointVentureInLosAngelesCaliforniaMember" id="olp_UnconsolidatedJointVentureInLosAngelesCaliforniaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UnconsolidatedJointVenturesMember" id="olp_UnconsolidatedJointVenturesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UrbanOutfittersStoreLawrenceKansasMember" id="olp_UrbanOutfittersStoreLawrenceKansasMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="VicksburgMS1Member" id="olp_VicksburgMS1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="VicksburgMS2Member" id="olp_VicksburgMS2Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="VirginiaBeachVAMember" id="olp_VirginiaBeachVAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WeightedAverageNumberOfDilutedSharesIncludingUnvestedRestrictedStockSharesOutstanding" id="olp_WeightedAverageNumberOfDilutedSharesIncludingUnvestedRestrictedStockSharesOutstanding" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WeightedAverageNumberOfSharesOutstandingIncludingUnvestedRestrictedStockSharesBasic" id="olp_WeightedAverageNumberOfSharesOutstandingIncludingUnvestedRestrictedStockSharesBasic" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WestHartfordCT1Member" id="olp_WestHartfordCT1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WestHartfordCT2Member" id="olp_WestHartfordCT2Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WestPalmBeachFLMember" id="olp_WestPalmBeachFLMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WichitaKSMember" id="olp_WichitaKSMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashDividendsPaidReconciliation" id="olp_CashDividendsPaidReconciliation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PropertyPlantAndEquipmentAndIntangibleAssetsLiabilitiesUsefulLifeMinimum" id="olp_PropertyPlantAndEquipmentAndIntangibleAssetsLiabilitiesUsefulLifeMinimum" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PropertyPlantAndEquipmentAndIntangibleAssetsLiabilitiesUsefulLifeMaximum" id="olp_PropertyPlantAndEquipmentAndIntangibleAssetsLiabilitiesUsefulLifeMaximum" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsUnderlyingShares" id="olp_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsUnderlyingShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsToDate" id="olp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsToDate" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfControllingInterestJointVentures" id="olp_NumberOfControllingInterestJointVentures" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AllowanceForDoubtfulAccountsReceivableRecoveriesNumberOfTenants" id="olp_AllowanceForDoubtfulAccountsReceivableRecoveriesNumberOfTenants" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LAFitnessHealthClubSecaucusNewJerseyMember" id="olp_LAFitnessHealthClubSecaucusNewJerseyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FedExFacilityMiamisburgOhioMember" id="olp_FedExFacilityMiamisburgOhioMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BigLotsRetailStoreBolingbrookIllinoisMember" id="olp_BigLotsRetailStoreBolingbrookIllinoisMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FedExFacilityDurhamNorthCarolinaMember" id="olp_FedExFacilityDurhamNorthCarolinaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BurlingtonCoatFactoryRetailPropertyRedevelopmentCherryHillNewJerseyMember" id="olp_BurlingtonCoatFactoryRetailPropertyRedevelopmentCherryHillNewJerseyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfAcquiredPropertiesForWhichPurchasePriceAllocationsIsInFinalizationProcess" id="olp_NumberOfAcquiredPropertiesForWhichPurchasePriceAllocationsIsInFinalizationProcess" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredRentReceivablesRelatedToPropertyTransferredToJointVenture" id="olp_DeferredRentReceivablesRelatedToPropertyTransferredToJointVenture" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="PropertyInFloridaAndLeasedToOfficeDepotMember" id="olp_PropertyInFloridaAndLeasedToOfficeDepotMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FederalExciseTaxAccruedOnUndistributedTaxableIncome" id="olp_FederalExciseTaxAccruedOnUndistributedTaxableIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="FederalExciseAndStateTaxPaidAndOrAccrued" id="olp_FederalExciseAndStateTaxPaidAndOrAccrued" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AssetsRelatedToPropertyContributedToJointVenture" id="olp_AssetsRelatedToPropertyContributedToJointVenture" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="AvailableforsaleSecuritiesCumulativeNetUnrealizedGain" id="olp_AvailableforsaleSecuritiesCumulativeNetUnrealizedGain" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="LineOfCreditFacilityIncreaseMaximumBorrowingCapacity" id="olp_LineOfCreditFacilityIncreaseMaximumBorrowingCapacity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="SecaucusNJMember" id="olp_SecaucusNJMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PinellasParkFLMember" id="olp_PinellasParkFLMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MiamisburgOHMember" id="olp_MiamisburgOHMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CarrolltonGAMember" id="olp_CarrolltonGAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CartersvilleGAMember" id="olp_CartersvilleGAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="KennesawGA1Member" id="olp_KennesawGA1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="KennesawGA2Member" id="olp_KennesawGA2Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LawrencevilleGAMember" id="olp_LawrencevilleGAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LawrenceKSMember" id="olp_LawrenceKSMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CapeGirardeauMOMember" id="olp_CapeGirardeauMOMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeptfordNJMember" id="olp_DeptfordNJMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="HoustonTX4Member" id="olp_HoustonTX4Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodValues" id="olp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodValues" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="JointVenturePartnerInterestInVariableInterestEntity" id="olp_JointVenturePartnerInterestInVariableInterestEntity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="VariableRateMortgageAndLoanOnOnePropertyMember" id="olp_VariableRateMortgageAndLoanOnOnePropertyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumbersOfSharesPurchasedInOpenMarketDuringPeriod" id="olp_NumbersOfSharesPurchasedInOpenMarketDuringPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AcquiredFiniteLivedIntangibleLiabilitiesWeightedAverageAmortizationPeriod" id="olp_AcquiredFiniteLivedIntangibleLiabilitiesWeightedAverageAmortizationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesToBeIssuedForEachOutstandingUnitOnNotSatisfyingPerformanceCriteria" id="olp_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesToBeIssuedForEachOutstandingUnitOnNotSatisfyingPerformanceCriteria" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateSharesVestedInPlan" id="olp_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateSharesVestedInPlan" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BRTRealtyTrustSecuritiesMember" id="olp_BRTRealtyTrustSecuritiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherEquitySecuritiesMember" id="olp_OtherEquitySecuritiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DerivativeNumberOfMortgageLoansOutstanding" id="olp_DerivativeNumberOfMortgageLoansOutstanding" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="GainLossOnDispositionOfRealEstateInUnconsolidatedJointVenture" id="olp_GainLossOnDispositionOfRealEstateInUnconsolidatedJointVenture" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodValueNewIssuesNetProceedBeforeOfferingCosts" id="olp_StockIssuedDuringPeriodValueNewIssuesNetProceedBeforeOfferingCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ProceedsBeforeCostOfSaleFromDivestitureOfInterestInJointVenture" id="olp_ProceedsBeforeCostOfSaleFromDivestitureOfInterestInJointVenture" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ProceedsFromSaleOfRealEstateInUnconsolidatedJointVenture" id="olp_ProceedsFromSaleOfRealEstateInUnconsolidatedJointVenture" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="SalePriceOfRealEstateSoldInUnconsolidatedJointVenture" id="olp_SalePriceOfRealEstateSoldInUnconsolidatedJointVenture" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="RestaurantPropertyMyrtleBeachSouthCarolinaMember" id="olp_RestaurantPropertyMyrtleBeachSouthCarolinaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestaurantPropertyAnnArborMichiganMember" id="olp_RestaurantPropertyAnnArborMichiganMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RetailPropertyIndianapolisIndianaMember" id="olp_RetailPropertyIndianapolisIndianaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PropertyLocatedInFortMillSouthCarolinaMember" id="olp_PropertyLocatedInFortMillSouthCarolinaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstatePropertyInMichiganMember" id="olp_RealEstatePropertyInMichiganMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RetailPropertyClemmonsNorthCarolinaMember" id="olp_RetailPropertyClemmonsNorthCarolinaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WalgreensPharmacyCapeGirardeauMissouriMember" id="olp_WalgreensPharmacyCapeGirardeauMissouriMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TwoHHGreggRetailStoresNilesAndCrystalLakeIllinoisMember" id="olp_TwoHHGreggRetailStoresNilesAndCrystalLakeIllinoisMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncrementalCommonSharesNotIncludingInComputationOfEarningPerShare" id="olp_IncrementalCommonSharesNotIncludingInComputationOfEarningPerShare" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestaurantPropertyGreensboroNCMember" id="olp_RestaurantPropertyGreensboroNCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestaurantPropertyRichmondVAMember" id="olp_RestaurantPropertyRichmondVAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AcquiredPropertyPercentageLeased" id="olp_AcquiredPropertyPercentageLeased" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LeasesAcquiredInPlaceExcludingBelowMarketLeaseMember" id="olp_LeasesAcquiredInPlaceExcludingBelowMarketLeaseMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExecutiveOfficersAndOthersMember" id="olp_ExecutiveOfficersAndOthersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionAmountPaid" id="olp_RelatedPartyTransactionAmountPaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AnnArborMIMember" id="olp_AnnArborMIMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClemmonsNCMember" id="olp_ClemmonsNCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConcordNCMember" id="olp_ConcordNCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FortMillSCMember" id="olp_FortMillSCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IndianapolisINMember" id="olp_IndianapolisINMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="KilleenTXMember" id="olp_KilleenTXMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MyrtleBeachSCMember" id="olp_MyrtleBeachSCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RoundRockTXMember" id="olp_RoundRockTXMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherRealEstateMember" id="olp_OtherRealEstateMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UnconsolidatedJointVentureMember" id="olp_UnconsolidatedJointVentureMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestaurantPropertyGreensboroNorthCarolinaMember" id="olp_RestaurantPropertyGreensboroNorthCarolinaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestaurantPropertyRichmondVirginiaMember" id="olp_RestaurantPropertyRichmondVirginiaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MortgageLoanMaturingOn1May2014Member" id="olp_MortgageLoanMaturingOn1May2014Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MortgageLoanMaturingOnFebruary2024Member" id="olp_MortgageLoanMaturingOnFebruary2024Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentTermOfInterestOnlyPayments" id="olp_DebtInstrumentTermOfInterestOnlyPayments" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsImprovements" id="olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsImprovements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionCostOfAcquiredEntityAssignmentFees" id="olp_BusinessAcquisitionCostOfAcquiredEntityAssignmentFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="RestaurantPropertiesKilleenTexasGreensboroNCAndRichmondVAMember" id="olp_RestaurantPropertiesKilleenTexasGreensboroNCAndRichmondVAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLeaseLiability" id="olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLeaseLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="BusinessCombinationAdjustmentsToIntangibleLeaseLiability" id="olp_BusinessCombinationAdjustmentsToIntangibleLeaseLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="BusinessCombinationAdjustmentsToIntangibleLeaseLiabilityAssetNet" id="olp_BusinessCombinationAdjustmentsToIntangibleLeaseLiabilityAssetNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessCombinationAdjustmentsToIntangibleLeaseAssets" id="olp_BusinessCombinationAdjustmentsToIntangibleLeaseAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BelowMarketLeaseAcquiredAfterAdjustments" id="olp_BelowMarketLeaseAcquiredAfterAdjustments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="FinitelivedIntangibleAssetsAcquiredAfterAdjustments" id="olp_FinitelivedIntangibleAssetsAcquiredAfterAdjustments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAfterAdjustments" id="olp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAfterAdjustments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
</xsd:schema>
