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  <xs:element id="amt_EstimatedUndiscountedFutureCashOutlayForAssetRetirementObligations" abstract="false" name="EstimatedUndiscountedFutureCashOutlayForAssetRetirementObligations" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="amt_RightToLeaseWeightedAverageTerm" abstract="false" name="RightToLeaseWeightedAverageTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="amt_AggregatePurchaseOptionPriceForTowers" abstract="false" name="AggregatePurchaseOptionPriceForTowers" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_CustomerLeaseInitialTerm" abstract="false" name="CustomerLeaseInitialTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="amt_SuccessiveTermsToRenewLease" abstract="false" name="SuccessiveTermsToRenewLease" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="amt_LeasedAssetsPurchasedNumberOfUnits" abstract="false" name="LeasedAssetsPurchasedNumberOfUnits" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <xs:element id="amt_CapitalExpendituresIncurredButNotYetPaidIncreaseDecrease" abstract="false" name="CapitalExpendituresIncurredButNotYetPaidIncreaseDecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_PropertyPlantAndEquipmentAdditionsDuringNoncashTransaction" abstract="false" name="PropertyPlantAndEquipmentAdditionsDuringNoncashTransaction" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_PropertyPlantAndEquipmentAdditionsDuringNoncashTransactionNumberOfTowers" abstract="false" name="PropertyPlantAndEquipmentAdditionsDuringNoncashTransactionNumberOfTowers" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="amt_CoreSiteRealtyCorporationMember" abstract="true" name="CoreSiteRealtyCorporationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="amt_SiteAcquiredNumberOfOperatingMarkets" abstract="false" name="SiteAcquiredNumberOfOperatingMarkets" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="amt_PropertyMember" abstract="true" name="PropertyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="amt_MexicoFiberMember" abstract="true" name="MexicoFiberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="amt_FinanceLeasePaymentsFinancingActivities" abstract="false" name="FinanceLeasePaymentsFinancingActivities" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_PaymentsForPerpetualLandEasements" abstract="false" name="PaymentsForPerpetualLandEasements" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_TMobileMember" abstract="true" name="TMobileMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="amt_ATAndTMobilityMember" abstract="true" name="ATAndTMobilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="amt_VerizonWirelessMember" abstract="true" name="VerizonWirelessMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="amt_TelefonicaMember" abstract="true" name="TelefonicaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_LossOnSaleOfDiscontinuedOperationMember" abstract="true" name="LossOnSaleOfDiscontinuedOperationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_SubsidiariesATCTIPLMember" abstract="true" name="SubsidiariesATCTIPLMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_RevenueInternationalBenchmarkMember" abstract="true" name="RevenueInternationalBenchmarkMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_GrossMarginInternationalBenchmarkMember" abstract="true" name="GrossMarginInternationalBenchmarkMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_OperatingProfitInternationalBenchmarkMember" abstract="true" name="OperatingProfitInternationalBenchmarkMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_SegmentGrossMarginBenchmarkMember" abstract="true" name="SegmentGrossMarginBenchmarkMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_SegmentOperatingProfitBenchmarkMember" abstract="true" name="SegmentOperatingProfitBenchmarkMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_CommunicationSitesInternationalBenchmarkMember" abstract="true" name="CommunicationSitesInternationalBenchmarkMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_CommunicationSitesBenchmarkMember" abstract="true" name="CommunicationSitesBenchmarkMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_SubsidiaryConcentrationRiskMember" abstract="true" name="SubsidiaryConcentrationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_IndiaTermLoanMember" abstract="true" name="IndiaTermLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="amt_DisposalGroupIncludingDiscontinuedOperationConsiderationToBeReceivedMaximum" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationConsiderationToBeReceivedMaximum" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DiscontinuedOperationCumulativeForeignCurrencyTranslationGainsLossesNetOfTax" abstract="false" name="DiscontinuedOperationCumulativeForeignCurrencyTranslationGainsLossesNetOfTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DisposalGroupIncludingDiscontinuedOperationNetAssets" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationNetAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DiscontinuedOperationGainLossOnSaleNetOfTax" abstract="false" name="DiscontinuedOperationGainLossOnSaleNetOfTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DisposalGroupIncludingDiscontinuedOperationDealCosts" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationDealCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DisposalGroupIncludingDiscontinuedOperationDeferredRentNoncurrent" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationDeferredRentNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DisposalGroupIncludingDiscontinuedOperationRightOfUseAssetNoncurrent" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationRightOfUseAssetNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DisposalGroupIncludingDiscontinuedOperationAccruedInterestCurrent" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationAccruedInterestCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilityCurrent" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilityCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DisposalGroupIncludingDiscontinuedOperationLongTermDebtCurrent" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationLongTermDebtCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilitiesNoncurrent" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationOperatingLeaseLiabilitiesNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DisposalGroupIncludingDiscontinuedOperationAssetRetirementObligationNoncurrent" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationAssetRetirementObligationNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DisposalGroupIncludingDiscontinuedOperationSellingGeneralAdministrativeAndDevelopmentExpense" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationSellingGeneralAdministrativeAndDevelopmentExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DisposalGroupIncludingDiscontinuedOperationOtherOperatingExpense" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationOtherOperatingExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpenseNet" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpenseNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DisposalGroupIncludingDiscontinuedOperationImpairmentsNetLossOnSaleOfLongLivedAssetsNonCashRestructuringAndMergerRelatedExpenses" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationImpairmentsNetLossOnSaleOfLongLivedAssetsNonCashRestructuringAndMergerRelatedExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DisposalGroupIncludingDiscontinuedOperationGainLossOnInvestmentsUnrealizedForeignCurrencyGainLossAndOtherNonCashIncomeExpense" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationGainLossOnInvestmentsUnrealizedForeignCurrencyGainLossAndOtherNonCashIncomeExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_SouthAfricaFiberMember" abstract="true" name="SouthAfricaFiberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_DisposalGroupIncludingDiscontinuedOperationNumberOfSubsidiariesDisposed" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationNumberOfSubsidiariesDisposed" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="amt_SECSchedule1228RealEstateCompaniesAdditionsAbstract" abstract="true" name="SECSchedule1228RealEstateCompaniesAdditionsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="amt_SECSchedule1228RealEstateCompaniesInvestmentInRealEstateDiscretionaryCapitalProjectAmount" abstract="false" name="SECSchedule1228RealEstateCompaniesInvestmentInRealEstateDiscretionaryCapitalProjectAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_SECSchedule1228RealEstateCompaniesInvestmentInRealEstateDiscretionaryGroundLeasePurchases" abstract="false" name="SECSchedule1228RealEstateCompaniesInvestmentInRealEstateDiscretionaryGroundLeasePurchases" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_SECSchedule1228RealEstateCompaniesInvestmentInRealEstateRedevelopmentCapitalExpenditures" abstract="false" name="SECSchedule1228RealEstateCompaniesInvestmentInRealEstateRedevelopmentCapitalExpenditures" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_SECSchedule1228RealEstateCompaniesInvestmentInRealEstateStartUpCapitalExpenditures" abstract="false" name="SECSchedule1228RealEstateCompaniesInvestmentInRealEstateStartUpCapitalExpenditures" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_SECSchedule1228RealEstateCompaniesInvestmentInRealEstateOtherAdditionNetOfAdjustments" abstract="false" name="SECSchedule1228RealEstateCompaniesInvestmentInRealEstateOtherAdditionNetOfAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_SECSchedule1228RealEstateCompaniesInvestmentInRealEstatePeriodAdditionsToCost" abstract="false" name="SECSchedule1228RealEstateCompaniesInvestmentInRealEstatePeriodAdditionsToCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_SECSchedule1228RealEstateCompaniesDeductionsAbstractAbstract" abstract="true" name="SECSchedule1228RealEstateCompaniesDeductionsAbstractAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="amt_SECSchedule1228RealEstateCompaniesInvestmentInRealEstatePeriodDeductionsToCost" abstract="false" name="SECSchedule1228RealEstateCompaniesInvestmentInRealEstatePeriodDeductionsToCost" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_SECSchedule1228RealEstateCompaniesInvestmentInRealEstateAccumulatedDepreciationAdditionsAbstract" abstract="true" name="SECSchedule1228RealEstateCompaniesInvestmentInRealEstateAccumulatedDepreciationAdditionsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="amt_SECSchedule1228RealEstateCompaniesInvestmentInRealEstateAdditionsToAccumulatedDepreciation" abstract="false" name="SECSchedule1228RealEstateCompaniesInvestmentInRealEstateAdditionsToAccumulatedDepreciation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_SECSchedule1228RealEstateCompaniesInvestmentInRealEstateAccumulatedDepreciationDeductionsAbstract" abstract="true" name="SECSchedule1228RealEstateCompaniesInvestmentInRealEstateAccumulatedDepreciationDeductionsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="amt_SECSchedule1228RealEstateCompaniesInvestmentInRealEstateDeductionsToAccumulatedDepreciation" abstract="false" name="SECSchedule1228RealEstateCompaniesInvestmentInRealEstateDeductionsToAccumulatedDepreciation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
