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  <xsd:element id="amt_CostOfOperations" name="CostOfOperations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_CostaRicaLoanMember" name="CostaRicaLoanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_CreditFacility2012Member" name="CreditFacility2012Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_CreditFacility2013Member" name="CreditFacility2013Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_CreditFacility2014Member" name="CreditFacility2014Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_CustomerLeaseInitialTermMinimum" name="CustomerLeaseInitialTermMinimum" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_CustomerrelatedandnetworklocationintangibleassetsMember" name="CustomerrelatedandnetworklocationintangibleassetsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_DebtAmountOfPrincipalRedemptionPercentage" name="DebtAmountOfPrincipalRedemptionPercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_DebtInstrumentCovenantThresholdForMajorityOfHoldersInEventOfDefault" name="DebtInstrumentCovenantThresholdForMajorityOfHoldersInEventOfDefault" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_DebtWeightedAverageLife" name="DebtWeightedAverageLife" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_Debtinstrumentadditionalspreadonvariablerate" name="Debtinstrumentadditionalspreadonvariablerate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_Debtinstrumentlengthofrenewalperiod" name="Debtinstrumentlengthofrenewalperiod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_DeferredRentAssetPolicyTextBlock" name="DeferredRentAssetPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_DeferredTaxDeferredRentNoncurrent" name="DeferredTaxDeferredRentNoncurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="amt_DeferredTaxLiabilityDepreciationAndAmortization" name="DeferredTaxLiabilityDepreciationAndAmortization" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="amt_DiscountAndPremiumOnNotesPolicyPolicyTextBlock" name="DiscountAndPremiumOnNotesPolicyPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_DiscretionaryCapitalProjects" name="DiscretionaryCapitalProjects" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="amt_DiscretionaryGroundLeasePurchases" name="DiscretionaryGroundLeasePurchases" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="amt_DividendPerShare" name="DividendPerShare" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_DividendsDeclaredandPaidMember" name="DividendsDeclaredandPaidMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_DividendsPaidLineItems" name="DividendsPaidLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_DividendsPaidTable" name="DividendsPaidTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_DocumentAndEntityInformationAbstract" name="DocumentAndEntityInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_EconomicRightsTvAztecaMember" name="EconomicRightsTvAztecaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_EffectiveIncomeTaxRateReconciliationDomesticTRSRestructuring" name="EffectiveIncomeTaxRateReconciliationDomesticTRSRestructuring" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_EmployeeStockPurchasePlanEmployeeDiscount" name="EmployeeStockPurchasePlanEmployeeDiscount" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_EmployeeStockPurchasePlanOfferingExpenseRecognitionPeriodInMonths" name="EmployeeStockPurchasePlanOfferingExpenseRecognitionPeriodInMonths" nillable="true" substitutionGroup="xbrli:item" type="us-types:durationStringItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_EmployeeStockPurchasePlanSharesRemainReservedForFutureIssuance" name="EmployeeStockPurchasePlanSharesRemainReservedForFutureIssuance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_EstimatedUndiscountedFutureCashOutlayForAssetRetirementObligations" name="EstimatedUndiscountedFutureCashOutlayForAssetRetirementObligations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="amt_ExcludingSemaanimpairmentMember" name="ExcludingSemaanimpairmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_FairValueOfConsiderationTransferredTableTextBlock" name="FairValueOfConsiderationTransferredTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_FairValueOfDebtAssumedThroughAcquisitions" name="FairValueOfDebtAssumedThroughAcquisitions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="amt_FirstmeasurementperiodMember" name="FirstmeasurementperiodMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_FirstportfolioMember" name="FirstportfolioMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_FivePointNineZeroPercentSeniorNotesMember" name="FivePointNineZeroPercentSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_FivePointZeroFivePercentSeniorNotesMember" name="FivePointZeroFivePercentSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_FivePointZeroPercentSeniorNotesMember" name="FivePointZeroPercentSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_Fixedannualrentescalationpercentage" name="Fixedannualrentescalationpercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_ForeignWithholdingTaxes" name="ForeignWithholdingTaxes" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_ForeigncurrencytransactiongainlossinAOCIandIncomeStatement" name="ForeigncurrencytransactiongainlossinAOCIandIncomeStatement" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="amt_ForeigncurrencytransactiongainlossreclassifiedasAOCI" name="ForeigncurrencytransactiongainlossreclassifiedasAOCI" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_FourPointFiveZeroPercentSeniorNotesMember" name="FourPointFiveZeroPercentSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_FourPointSevenZeroPercentSeniorNotesMember" name="FourPointSevenZeroPercentSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_FourPointSixTwoFivePercentSeniorNotesMember" name="FourPointSixTwoFivePercentSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_FourthmeasurementperiodMember" name="FourthmeasurementperiodMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_Futuremonthlysubleaserentpertower" name="Futuremonthlysubleaserentpertower" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="amt_GTPNotesMember" name="GTPNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_GhanaAcquisitionMember" name="GhanaAcquisitionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_GhanaLoanMember" name="GhanaLoanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_IncomeTaxExpenseRestructuringDomesticTRS" name="IncomeTaxExpenseRestructuringDomesticTRS" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="amt_IncreaseDecreaseInDeferredRentLiability" name="IncreaseDecreaseInDeferredRentLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="amt_IndefiniteCarryforward" name="IndefiniteCarryforward" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="amt_IndiaTaxAssessment" name="IndiaTaxAssessment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_IndianFacilityMember" name="IndianFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_IntangibletypeAxis" name="IntangibletypeAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_IntangibletypeDomain" name="IntangibletypeDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_InternationalMember" name="InternationalMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_LaborCostsCapitalized" name="LaborCostsCapitalized" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_LetterOfCreditByTypeOfSubborrowingAxis" name="LetterOfCreditByTypeOfSubborrowingAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_LetterOfCreditByTypeOfSubborrowingDomain" name="LetterOfCreditByTypeOfSubborrowingDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_Letterofcreditamountofincreaseinborrowingcapacity" name="Letterofcreditamountofincreaseinborrowingcapacity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="amt_LimitOnIndebtedness" name="LimitOnIndebtedness" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="amt_Lineofcreditfacilityamountofincreaseinborrowingcapacity" name="Lineofcreditfacilityamountofincreaseinborrowingcapacity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="amt_Lineofcreditfacilityoptionaladditionalcommitments" name="Lineofcreditfacilityoptionaladditionalcommitments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="amt_LoanPrepaymentWithoutPenaltyPeriodYears" name="LoanPrepaymentWithoutPenaltyPeriodYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_LoanReceivableInterestRate" name="LoanReceivableInterestRate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_LongTermDebtTotalCashObligations" name="LongTermDebtTotalCashObligations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="amt_LossGainOnInvestmentsAndOtherNonCashIncomeExpense" name="LossGainOnInvestmentsAndOtherNonCashIncomeExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="amt_LossonRetirementofLongTermObligationsPolicyPolicyTextBlock" name="LossonRetirementofLongTermObligationsPolicyPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_MIPTAcquisitionMember" name="MIPTAcquisitionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_MIPTMember" name="MIPTMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_MaximumAdjustedEBITDA" name="MaximumAdjustedEBITDA" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_MaximumEmployeePurchaseValueDuringPeriod" name="MaximumEmployeePurchaseValueDuringPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="amt_Maximumincrementaltermloancommitment" name="Maximumincrementaltermloancommitment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="amt_Maximumrevolvingloancommitments" name="Maximumrevolvingloancommitments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="amt_MeasurementperiodAxis" name="MeasurementperiodAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_MeasurementperiodDomain" name="MeasurementperiodDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_MexicanloanMember" name="MexicanloanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_MexicoAxtelAcquisitionMember" name="MexicoAxtelAcquisitionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_MinimumDebtServiceCreditRatio" name="MinimumDebtServiceCreditRatio" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="amt_MulticurrencyBorrowingsMember" name="MulticurrencyBorrowingsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_NIIHoldingsAcquisitionMember" name="NIIHoldingsAcquisitionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_NIIHoldingsMember" name="NIIHoldingsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_NatureofOperationsPolicyPolicyTextBlock" name="NatureofOperationsPolicyPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_NetLongTermOperatingLossCarryForwards" name="NetLongTermOperatingLossCarryForwards" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="amt_NetOperatingLossCarryforwardsExpiringYearsElevenThroughFifteen" name="NetOperatingLossCarryforwardsExpiringYearsElevenThroughFifteen" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="amt_NetOperatingLossCarryforwardsExpiringYearsOneThroughFive" name="NetOperatingLossCarryforwardsExpiringYearsOneThroughFive" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="amt_NetOperatingLossCarryforwardsExpiringYearsSixThroughTen" name="NetOperatingLossCarryforwardsExpiringYearsSixThroughTen" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="amt_NetOperatingLossCarryforwardsExpiringYearsSixteenThroughTwenty" name="NetOperatingLossCarryforwardsExpiringYearsSixteenThroughTwenty" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="amt_NetworkDevelopmentServicesMember" name="NetworkDevelopmentServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_NotesReceivableAndOtherLongTermAssetsAbstract" name="NotesReceivableAndOtherLongTermAssetsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_NotesReceivableAndOtherLongTermAssetsPolicyTextBlock" name="NotesReceivableAndOtherLongTermAssetsPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_NotesReceivableAndOtherNonCurrentAssetsLineItems" name="NotesReceivableAndOtherNonCurrentAssetsLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_NotesReceivableAndOtherNonCurrentAssetsTable" name="NotesReceivableAndOtherNonCurrentAssetsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_NotesReceivablesAndOtherLongTermAssetsDisclosureTextBlock" name="NotesReceivablesAndOtherLongTermAssetsDisclosureTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_NumberOfBridgeLoans" name="NumberOfBridgeLoans" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_NumberOfBroadcastAndWirelessCommunicationsTowers" name="NumberOfBroadcastAndWirelessCommunicationsTowers" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_NumberOfBroadcastTowers" name="NumberOfBroadcastTowers" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_NumberOfCustomersConcentrationOfCreditRisk" name="NumberOfCustomersConcentrationOfCreditRisk" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_NumberOfPropertyInterestsAcquired" name="NumberOfPropertyInterestsAcquired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_NumberOfSitesAcquired" name="NumberOfSitesAcquired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_NumberOfSitesToBeAcquired" name="NumberOfSitesToBeAcquired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_NumberOfSubsidiaries" name="NumberOfSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_NumberofAnnualRenewalPeriods" name="NumberofAnnualRenewalPeriods" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_Numberofrenewalperiods" name="Numberofrenewalperiods" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="amt_OperationsInPanamaandPortionofEngineeringBusinessMember" name="OperationsInPanamaandPortionofEngineeringBusinessMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_OrdinaryIncomeMember" name="OrdinaryIncomeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_OtherInternationalAcquisitionMember" name="OtherInternationalAcquisitionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_OtherInternationalAcquisitions2014Member" name="OtherInternationalAcquisitions2014Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_OtherOperatingExpensesPolicyPolicyTextBlock" name="OtherOperatingExpensesPolicyPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_OtherUSAcquisition2014Member" name="OtherUSAcquisition2014Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_OtherUsAcquisition2013Member" name="OtherUsAcquisition2013Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_PaidDividendRSU" name="PaidDividendRSU" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="amt_PartialPaymentOfAggregatePurchasePrice" name="PartialPaymentOfAggregatePurchasePrice" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="amt_PaymentsforPurchaseofNoncontrollingInterest" name="PaymentsforPurchaseofNoncontrollingInterest" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="amt_PercentageOfEmployeePurchasesNotToExceedGrossCompensation" name="PercentageOfEmployeePurchasesNotToExceedGrossCompensation" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_PercentageOfGrossAmountsMaximum" name="PercentageOfGrossAmountsMaximum" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_PercentageOfRevenuesFromLeasingOfTowers" name="PercentageOfRevenuesFromLeasingOfTowers" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_PreferredStockAssumedThroughAcquisitions" name="PreferredStockAssumedThroughAcquisitions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="amt_PreferredStockDividendsDeclaredPercentageofTotal" name="PreferredStockDividendsDeclaredPercentageofTotal" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_PreliminaryPurchasePriceAllocationMember" name="PreliminaryPurchasePriceAllocationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_PrepaidLongTermOperatingGroundLeases" name="PrepaidLongTermOperatingGroundLeases" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="amt_PrepaidOperatingGroundLeases" name="PrepaidOperatingGroundLeases" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="amt_PrepaymentPenaltyMember" name="PrepaymentPenaltyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_ProceedsFromSaleOfAvailableForSaleSecuritiesAndOtherProductiveAssets" name="ProceedsFromSaleOfAvailableForSaleSecuritiesAndOtherProductiveAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="amt_PropertyInterestsUnderCommunicationsSites" name="PropertyInterestsUnderCommunicationsSites" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="amt_ProposedVerizonTransactionMember" name="ProposedVerizonTransactionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_PurchasePriceAccretionRate" name="PurchasePriceAccretionRate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_PurchasePriceOfTowerInSharesCommonStock" name="PurchasePriceOfTowerInSharesCommonStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_PurchasePricePerTower" name="PurchasePricePerTower" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="amt_PurchasePriceValue" name="PurchasePriceValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="amt_PurchaseSharesFairValuePricePerShareESPP" name="PurchaseSharesFairValuePricePerShareESPP" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_PurchasedSubleasedTowersNumberOfUnits" name="PurchasedSubleasedTowersNumberOfUnits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_RangeFiveMember" name="RangeFiveMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_RangeFourMember" name="RangeFourMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_RangeOneMember" name="RangeOneMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_RangeThreeMember" name="RangeThreeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_RangeTwoMember" name="RangeTwoMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_RatiooftotaldebttoEBITDA" name="RatiooftotaldebttoEBITDA" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_RealEstateAndAccumulatedDepreciationCarryingAmount" name="RealEstateAndAccumulatedDepreciationCarryingAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="amt_RealEstateDateAcquired" name="RealEstateDateAcquired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_RealEstateDateOfConstruction" name="RealEstateDateOfConstruction" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_RealEstatePeriodAdditionsToAccumulatedDepreciation" name="RealEstatePeriodAdditionsToAccumulatedDepreciation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="amt_RealEstatePeriodAdditionsToCost" name="RealEstatePeriodAdditionsToCost" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="amt_RealEstatePeriodDeductionsToAccumulatedDepreciation" name="RealEstatePeriodDeductionsToAccumulatedDepreciation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="amt_RealEstatePeriodDeductionsToCost" name="RealEstatePeriodDeductionsToCost" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_ReceivableAxisAxis" name="ReceivableAxisAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_ReclassifiedtoAOCIMember" name="ReclassifiedtoAOCIMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_RedevelopmentCapitalExpenditures" name="RedevelopmentCapitalExpenditures" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="amt_RentExpensePolicyPolicyTextBlock" name="RentExpensePolicyPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_RentalAndManagementMember" name="RentalAndManagementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_ReopenedFivePointZeroPercentMember" name="ReopenedFivePointZeroPercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_ReopenedThreePointFourZeroPercentSeniorNotesMember" name="ReopenedThreePointFourZeroPercentSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_RepaymentofPrincipalMember" name="RepaymentofPrincipalMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_RepurchasePriceAsPercentageOfPrincipal" name="RepurchasePriceAsPercentageOfPrincipal" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="amt_ReturnofCapitalMember" name="ReturnofCapitalMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_RichlandAcquisitionMember" name="RichlandAcquisitionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_RichlandNotesMember" name="RichlandNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_Righttoleaseweightedaverageterm" name="Righttoleaseweightedaverageterm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_Righttousepropertyinterestsacquired" name="Righttousepropertyinterestsacquired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_Righttousesitesacquired" name="Righttousesitesacquired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_ScheduleOfFutureMinimumRentalReceiptsTableTextBlock" name="ScheduleOfFutureMinimumRentalReceiptsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_ScheduleOfNotesReceivablesAndOtherLongTermAssetsTableTextBlock" name="ScheduleOfNotesReceivablesAndOtherLongTermAssetsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_ScheduleofBRTowersCreditFacilitySublimitsTableTextBlock" name="ScheduleofBRTowersCreditFacilitySublimitsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_ScheduleofDebtDiscountsTableTextBlock" name="ScheduleofDebtDiscountsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_ScheduleofGTPSecuritizationsTableTextBlock" name="ScheduleofGTPSecuritizationsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_ScheduleofshareholderloansTableTextBlock" name="ScheduleofshareholderloansTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_SecondmeasurementperiodMember" name="SecondmeasurementperiodMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_SecondportfolioMember" name="SecondportfolioMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_SecuredCellularSiteRevenueNotesMember" name="SecuredCellularSiteRevenueNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_SecuredTowerRevenueSecuritiesSeries20131AMember" name="SecuredTowerRevenueSecuritiesSeries20131AMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_SecuredTowerRevenueSecuritiesSeries20132AMember" name="SecuredTowerRevenueSecuritiesSeries20132AMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_Securitization2007Member" name="Securitization2007Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_SegmentOperatingExpenses" name="SegmentOperatingExpenses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="amt_SegmentOperatingProfit" name="SegmentOperatingProfit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="amt_SegmentReportingSegmentGrossProfit" name="SegmentReportingSegmentGrossProfit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="amt_SegmentSellingGeneralAdministrationAndDevelopmentExpenses" name="SegmentSellingGeneralAdministrationAndDevelopmentExpenses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_SellingGeneralAdministrativeAndDevelopmentExpenseMember" name="SellingGeneralAdministrativeAndDevelopmentExpenseMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_Series20101ClassCMember" name="Series20101ClassCMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_Series20102ClassCMember" name="Series20102ClassCMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_Series20102ClassFMember" name="Series20102ClassFMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_Series20111ClassCNotesMember" name="Series20111ClassCNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_Series20112ClassCNotesMember" name="Series20112ClassCNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_Series20112ClassFNotesMember" name="Series20112ClassFNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_Series20121ClassANotesMember" name="Series20121ClassANotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_Series20122ClassANotesMember" name="Series20122ClassANotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_Series20122ClassBNotesMember" name="Series20122ClassBNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_Series20122ClassCNotesMember" name="Series20122ClassCNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_Series20131ClassCNotesMember" name="Series20131ClassCNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_Series20131ClassFNotesMember" name="Series20131ClassFNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_SeriesOfSecurities" name="SeriesOfSecurities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_SettlementOfAccountsReceivableDueToAcquisition" name="SettlementOfAccountsReceivableDueToAcquisition" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_SevenPointTwoFivePercentSeniorNotesMember" name="SevenPointTwoFivePercentSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_SevenPointZeroZeroPercentSeniorNotesMember" name="SevenPointZeroZeroPercentSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsExpectedToVestNetOfForfeitures" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsExpectedToVestNetOfForfeitures" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="amt_ShareholderLoansMember" name="ShareholderLoansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_ShortTermCreditFacilityMember" name="ShortTermCreditFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_SignificantAccountingPoliciesandUseofEstimatesPolicyPolicyTextBlock" name="SignificantAccountingPoliciesandUseofEstimatesPolicyPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_SouthAfricanFacilityMember" name="SouthAfricanFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_SprintNextelMember" name="SprintNextelMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_StartUpCapitalExpenditures" name="StartUpCapitalExpenditures" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="amt_StraightLineExpense" name="StraightLineExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="amt_StraightLineRevenue" name="StraightLineRevenue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="amt_SuccessiveTermsToRenewLease" name="SuccessiveTermsToRenewLease" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_SwinglineLoanMember" name="SwinglineLoanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_TIMAcquisitionMember" name="TIMAcquisitionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_TMobileMember" name="TMobileMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_TVAztecaMember" name="TVAztecaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_TaxAdjustmentRelatedToReit" name="TaxAdjustmentRelatedToReit" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_TaxTreatmentAxis" name="TaxTreatmentAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_TaxTreatmentDomain" name="TaxTreatmentDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_TelevisionAndRadioBroadcastMember" name="TelevisionAndRadioBroadcastMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_TermLoan2013Member" name="TermLoan2013Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_TermLoanoptionaladditionalcommitments" name="TermLoanoptionaladditionalcommitments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="amt_TermOfLoan" name="TermOfLoan" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_Terminationfee" name="Terminationfee" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_ThirdmeasurementperiodMember" name="ThirdmeasurementperiodMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_ThreePointFiveZeroNotesMember" name="ThreePointFiveZeroNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_ThreePointFiveZeroPercentSeniorNotesMember" name="ThreePointFiveZeroPercentSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_ThreePointFourFiveZeroPercentSeniorNotesMember" name="ThreePointFourFiveZeroPercentSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_ThreePointFourZeroPercentSeniorNotesMember" name="ThreePointFourZeroPercentSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_ThreePointFourZeroandFivePointZeroPercentSeniorNotesMemberMember" name="ThreePointFourZeroandFivePointZeroPercentSeniorNotesMemberMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_TowerMember" name="TowerMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_TowersAssetBalanceGross" name="TowersAssetBalanceGross" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="amt_TrancheAxis" name="TrancheAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_TrancheDomain" name="TrancheDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_TreasuryStockPolicyPolicyTextBlock" name="TreasuryStockPolicyPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_UgandaLoanMember" name="UgandaLoanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromForeignCurrencyChanges" name="UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromForeignCurrencyChanges" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_VerizonWirelessMember" name="VerizonWirelessMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_WeightedAverageGrantDateFairValueExpectedToVestNetOfEstimatedForfeitures" name="WeightedAverageGrantDateFairValueExpectedToVestNetOfEstimatedForfeitures" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="amt_ZSitesAcquisitionMember" name="ZSitesAcquisitionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>


