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| <link:definition> 2401401 - Disclosure - Organization - Additional Information (Detail) </link:definition> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| </link:roleType> |
| | | <link:roleType id="RecentlyIssuedAccountingLiterature" roleURI="http://www.alx-inc.com/role/RecentlyIssuedAccountingLiterature"> |
| <link:definition> 2103100 - Disclosure - Recently Issued Accounting Literature </link:definition> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| </link:roleType> |
| | | <link:roleType id="RecentlyIssuedAccountingLiteratureAdditionalInformationDetail" roleURI="http://www.alx-inc.com/role/RecentlyIssuedAccountingLiteratureAdditionalInformationDetail"> |
| <link:definition> 2403401 - Disclosure - Recently Issued Accounting Literature - Additional Information (Detail) </link:definition> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| </link:roleType> |
| | | <link:roleType id="RelatedPartyTransactions" roleURI="http://www.alx-inc.com/role/RelatedPartyTransactions"> |
| <link:definition> 2105100 - Disclosure - Related Party Transactions </link:definition> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| </link:roleType> |
| | | <link:roleType id="RelatedPartyTransactionsAdditionalInformationDetail" roleURI="http://www.alx-inc.com/role/RelatedPartyTransactionsAdditionalInformationDetail"> |
| <link:definition> 2405402 - Disclosure - Related Party Transactions - Additional Information (Detail) </link:definition> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| </link:roleType> |
| | | <link:roleType id="RelatedPartyTransactionsSummaryOfFeesToVornadoDetail" roleURI="http://www.alx-inc.com/role/RelatedPartyTransactionsSummaryOfFeesToVornadoDetail"> |
| <link:definition> 2405403 - Disclosure - Related Party Transactions - Summary of Fees to Vornado (Detail) </link:definition> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| </link:roleType> |
| | | <link:roleType id="RelatedPartyTransactionsTables" roleURI="http://www.alx-inc.com/role/RelatedPartyTransactionsTables"> |
| <link:definition> 2305301 - Disclosure - Related Party Transactions (Tables) </link:definition> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| </link:roleType> |
| | | <link:roleType id="RevenueRecognition" roleURI="http://www.alx-inc.com/role/RevenueRecognition"> |
| <link:definition> 2104100 - Disclosure - Revenue Recognition </link:definition> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| </link:roleType> |
| | | <link:roleType id="RevenueRecognitionComponentsOfLeaseRevenueDetails" roleURI="http://www.alx-inc.com/role/RevenueRecognitionComponentsOfLeaseRevenueDetails"> |
| <link:definition> 2404403 - Disclosure - Revenue Recognition - Components of Lease Revenue (Details) </link:definition> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| </link:roleType> |
| | | <link:roleType id="RevenueRecognitionDisaggregationOfRevenueDetails" roleURI="http://www.alx-inc.com/role/RevenueRecognitionDisaggregationOfRevenueDetails"> |
| <link:definition> 2404402 - Disclosure - Revenue Recognition - Disaggregation of Revenue (Details) </link:definition> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| </link:roleType> |
| | | <link:roleType id="RevenueRecognitionTables" roleURI="http://www.alx-inc.com/role/RevenueRecognitionTables"> |
| <link:definition> 2304301 - Disclosure - Revenue Recognition (Tables) </link:definition> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| </link:roleType> |
| | | <link:roleType id="SignificantTenant" roleURI="http://www.alx-inc.com/role/SignificantTenant"> |
| <link:definition> 2108100 - Disclosure - Significant Tenant </link:definition> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| </link:roleType> |
| | | <link:roleType id="SignificantTenantAdditionalInformationDetail" roleURI="http://www.alx-inc.com/role/SignificantTenantAdditionalInformationDetail"> |
| <link:definition> 2408401 - Disclosure - Significant Tenant - Additional Information (Detail) </link:definition> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| </link:roleType> |
| | | <link:roleType id="StockBasedCompensation" roleURI="http://www.alx-inc.com/role/StockBasedCompensation"> |
| <link:definition> 2110100 - Disclosure - Stock-Based Compensation </link:definition> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| </link:roleType> |
| | | <link:roleType id="StockBasedCompensationAdditionalInformationDetail" roleURI="http://www.alx-inc.com/role/StockBasedCompensationAdditionalInformationDetail"> |
| <link:definition> 2410401 - Disclosure - Stock-Based Compensation - Additional Information (Detail) </link:definition> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| </link:roleType> |
| | | </xsd:appinfo> |
| | </xsd:annotation> |
| <xsd:element id="alx_AdditionalRealEstateTransferTax" name="AdditionalRealEstateTransferTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_AlexanderApartmentTowerMember" name="AlexanderApartmentTowerMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_AlexandersInc.Member" name="AlexandersInc.Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_AllRiskPropertyAndRentalValueMember" name="AllRiskPropertyAndRentalValueMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_AnnualRevenueAttributableToTenant" name="AnnualRevenueAttributableToTenant" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/> |
| <xsd:element id="alx_AssetSaleCommissionThreshold" name="AssetSaleCommissionThreshold" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_BloombergMember" name="BloombergMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_CommonAreaMember" name="CommonAreaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_CompanyManagementFeesMember" name="CompanyManagementFeesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_DevelopmentFeePercentage" name="DevelopmentFeePercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_DevelopmentFeesMember" name="DevelopmentFeesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_DirectServicesMember" name="DirectServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_EconomicBasisOfMarketableSecuritiesPerShare" name="EconomicBasisOfMarketableSecuritiesPerShare" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="instant"/> |
| <xsd:element abstract="true" id="alx_EstimatedFutureDamagesMember" name="EstimatedFutureDamagesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_ExpenseReimbursements" name="ExpenseReimbursements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/> |
| <xsd:element id="alx_FederalGovernmentResponsibility" name="FederalGovernmentResponsibility" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant"/> |
| <xsd:element abstract="true" id="alx_FiftyNinthStreetInsuranceCompanyLlcMember" name="FiftyNinthStreetInsuranceCompanyLlcMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_IkeaMember" name="IkeaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_InsuranceCoverageEndDate" name="InsuranceCoverageEndDate" nillable="true" substitutionGroup="xbrli:item" type="xbrli:dateItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_InsuranceDeductible" name="InsuranceDeductible" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element id="alx_InsuranceMaximumCoverageInAggregate" name="InsuranceMaximumCoverageInAggregate" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element id="alx_InsuranceMaximumCoveragePerIncident" name="InsuranceMaximumCoveragePerIncident" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element id="alx_InsuranceMaximumCoveragePerProperty" name="InsuranceMaximumCoveragePerProperty" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element id="alx_LeaseFeePercentageOfRentElevenToTwentyYears" name="LeaseFeePercentageOfRentElevenToTwentyYears" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_LeaseFeePercentageOfRentOneToTenYears" name="LeaseFeePercentageOfRentOneToTenYears" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_LeaseFeePercentageOfRentTwentyFirstToThirtyYears" name="LeaseFeePercentageOfRentTwentyFirstToThirtyYears" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_LeasesOfLessorRentalTermRange" name="LeasesOfLessorRentalTermRange" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_LeasingFeesMember" name="LeasingFeesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_LesseeOperatingLeaseLiabilityPaymentsDueafterYearSix" name="LesseeOperatingLeaseLiabilityPaymentsDueafterYearSix" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/> |
| <xsd:element id="alx_LesseeOperatingLeaseLiabilityPaymentsDueinYearSix" name="LesseeOperatingLeaseLiabilityPaymentsDueinYearSix" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/> |
| <xsd:element id="alx_LesseeOperatingLeaseNumberOfExtensionOptions" name="LesseeOperatingLeaseNumberOfExtensionOptions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant"/> |
| <xsd:element id="alx_LessorOperatingLeasePaymentstobeReceivedSixYears" name="LessorOperatingLeasePaymentstobeReceivedSixYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/> |
| <xsd:element id="alx_LessorOperatingLeasePaymentstobeReceivedafterYearSix" name="LessorOperatingLeasePaymentstobeReceivedafterYearSix" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/> |
| <xsd:element abstract="true" id="alx_LexingtonAvenuePropertyMember" name="LexingtonAvenuePropertyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_LoanAmortizationPeriod" name="LoanAmortizationPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_MacerichMember" name="MacerichMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_ManagementFeeAgreementValue" name="ManagementFeeAgreementValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_ManagementPropertyManagementCleaningEngineeringAndSecurityFeesMember" name="ManagementPropertyManagementCleaningEngineeringAndSecurityFeesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_MarketableSecuritiesMember" name="MarketableSecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_NbcrMember" name="NbcrMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_NonCashAdditionsToRealEstate" name="NonCashAdditionsToRealEstate" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element id="alx_NotesPayableGross" name="NotesPayableGross" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/> |
| <xsd:element id="alx_NumberOfFires" name="NumberOfFires" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_OfficeAndRetailSpaceMember" name="OfficeAndRetailSpaceMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_OperatingPropertyMember" name="OperatingPropertyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_ParamusPropertyMember" name="ParamusPropertyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_ParticipationAgreementMember" name="ParticipationAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_PaymentsForCapitalImprovementsAndConstructionInProcess" name="PaymentsForCapitalImprovementsAndConstructionInProcess" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/> |
| <xsd:element id="alx_PercentageCommissionsOnSaleOfAssetsOverFiftyMillion" name="PercentageCommissionsOnSaleOfAssetsOverFiftyMillion" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_PercentageCommissionsOnSaleOfAssetsUnderFiftyMillion" name="PercentageCommissionsOnSaleOfAssetsUnderFiftyMillion" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_PercentageIncreaseLeaseFeeIfBrokerUsed" name="PercentageIncreaseLeaseFeeIfBrokerUsed" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_PercentageOfMinimumRevenueThresholdContributedByOneTenant" name="PercentageOfMinimumRevenueThresholdContributedByOneTenant" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_PropertyManagementFeeAgreementPricePerSquareFoot" name="PropertyManagementFeeAgreementPricePerSquareFoot" nillable="true" substitutionGroup="xbrli:item" type="srt-types:perUnitItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_PropertyManagementFeeAgreementValue" name="PropertyManagementFeeAgreementValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element id="alx_PropertyManagementFeeEscalationPercentagePerAnnum" name="PropertyManagementFeeEscalationPercentagePerAnnum" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_PropertyManagementFeesMember" name="PropertyManagementFeesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_PropertyPurchaseOptionExercisableByLessee" name="PropertyPurchaseOptionExercisableByLessee" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/> |
| <xsd:element id="alx_PurchaseOptionExercisedProceedsFromSaleOfLandHeldForUse" name="PurchaseOptionExercisedProceedsFromSaleOfLandHeldForUse" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element id="alx_PurchaseOptionNotExercisedAmountIncludedInTripleNetRentOverRemainderOfLease" name="PurchaseOptionNotExercisedAmountIncludedInTripleNetRentOverRemainderOfLease" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_RealEstatePropertyOccupantAxis" name="RealEstatePropertyOccupantAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_RealEstatePropertyOccupantDomain" name="RealEstatePropertyOccupantDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_RealEstateTaxExpenseInterest" name="RealEstateTaxExpenseInterest" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element id="alx_ReclassificationofPrepaidRealEstateTaxestoConstructioninProgress" name="ReclassificationofPrepaidRealEstateTaxestoConstructioninProgress" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_RegoPark1PropertyMember" name="RegoPark1PropertyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_RegoPark2PropertyMember" name="RegoPark2PropertyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_RestatementToReclassifyRegoParkIIAsAReductionToMortagePayableNetOfDeferredDebtIssuanceCostsMember" name="RestatementToReclassifyRegoParkIIAsAReductionToMortagePayableNetOfDeferredDebtIssuanceCostsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_ScheduleOfInsuranceTypeAndTierIdentifierAxis" name="ScheduleOfInsuranceTypeAndTierIdentifierAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_ScheduleofFutureMinimumRentalPaymentsReceivableforOperatingLeasesTableTextBlock" name="ScheduleofFutureMinimumRentalPaymentsReceivableforOperatingLeasesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_SearsMember" name="SearsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_SelfInsuredResponsibility" name="SelfInsuredResponsibility" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant"/> |
| <xsd:element abstract="true" id="alx_SevenThreeOneLexingtonAvenuePropertyMember" name="SevenThreeOneLexingtonAvenuePropertyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValuePerGrant" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValuePerGrant" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element id="alx_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValueTotal" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantDateFairValueTotal" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element id="alx_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantedPerDirector" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantedPerDirector" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_TenantOccupantMember" name="TenantOccupantMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_TerrorismCoverageIncludingNbcrMember" name="TerrorismCoverageIncludingNbcrMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_ToysRUsMember" name="ToysRUsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_TripleNetRentAnnualAmount" name="TripleNetRentAnnualAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="alx_TypesAndTierIdentifierDomain" name="TypesAndTierIdentifierDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_UnamortizedLeasingFeesToRelatedParty" name="UnamortizedLeasingFeesToRelatedParty" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/> |
| <xsd:element abstract="true" id="alx_VornadoMember" name="VornadoMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="alx_WriteOffOfFullyAmortizedAndDepreciatedAssets" name="WriteOffOfFullyAmortizedAndDepreciatedAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/> |
| </xsd:schema> |