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  <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 id="amt_IncreaseDecreaseInCapitalExpendituresIncurredButNotYetPaid" name="IncreaseDecreaseInCapitalExpendituresIncurredButNotYetPaid" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="amt_IndiaTaxAssessment" name="IndiaTaxAssessment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="amt_InitialLeaseTerm" name="InitialLeaseTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_InterestrateswapsandtreasurylocksMember" name="InterestrateswapsandtreasurylocksMember" 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 abstract="true" id="amt_LeasedSitesMember" name="LeasedSitesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <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_MaximumAdjustedEBITDA" name="MaximumAdjustedEBITDA" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="instant" />
  <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 id="amt_MinimumDebtServiceCreditRatio" name="MinimumDebtServiceCreditRatio" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" 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 id="amt_NoncashorPartNoncashAcquisitionValueofLiabilitiesAssumedCurrentPortion" name="NoncashorPartNoncashAcquisitionValueofLiabilitiesAssumedCurrentPortion" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" 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_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_NumberofAnnualRenewalPeriods" name="NumberofAnnualRenewalPeriods" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_Operatingleasefutureminimumrentalpaymentsaveragerecognitionperiod" name="Operatingleasefutureminimumrentalpaymentsaveragerecognitionperiod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_Operatingleasefutureminimumrentalreceiptsaveragerecognitionperiod" name="Operatingleasefutureminimumrentalreceiptsaveragerecognitionperiod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" 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 abstract="true" id="amt_OtherInternationalAcquisitions2015Member" name="OtherInternationalAcquisitions2015Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" 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_OtherUsAcquisition2015Member" name="OtherUsAcquisition2015Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_OwnedSitesMember" name="OwnedSitesMember" 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_PercentageOfEmployeePurchasesNotToExceedGrossCompensation" name="PercentageOfEmployeePurchasesNotToExceedGrossCompensation" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_Percentageofpotentialtargetshares" name="Percentageofpotentialtargetshares" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_PreferredStockAdditionalSharesIssued" name="PreferredStockAdditionalSharesIssued" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <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_PreferredStockDepositarySharesPercentageofPreferredShares" name="PreferredStockDepositarySharesPercentageofPreferredShares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="amt_PreferredStockLiquidationPreferenceDepositaryShares" name="PreferredStockLiquidationPreferenceDepositaryShares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="amt_PreliminaryPurchasePriceAllocationMember" name="PreliminaryPurchasePriceAllocationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_PrepaidOperatingGroundLeases" name="PrepaidOperatingGroundLeases" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <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_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_REITLiquidationTaxCharge" name="REITLiquidationTaxCharge" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="amt_RatiooftotaldebttoEBITDA" name="RatiooftotaldebttoEBITDA" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="amt_RentalAndManagementMember" name="RentalAndManagementMember" 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_RichlandAcquisitionMember" name="RichlandAcquisitionMember" 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_ScheduleofBrazilCreditFacilitySublimitsTableTextBlock" name="ScheduleofBrazilCreditFacilitySublimitsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_ScheduleofmergerandacquisitionrelatedcostsTableTextBlock" name="ScheduleofmergerandacquisitionrelatedcostsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_SecondQuarterMember" name="SecondQuarterMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" 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 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_Series20151ClassAMember" name="Series20151ClassAMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_Series20152ClassAMember" name="Series20152ClassAMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <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_SevenPointZeroZeroPercentSeniorNotesMember" name="SevenPointZeroZeroPercentSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_Sharesgrantedgrantdatefairvaluenotyetestablished" name="Sharesgrantedgrantdatefairvaluenotyetestablished" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" 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 id="amt_SuccessiveTermsToRenewLease" name="SuccessiveTermsToRenewLease" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" 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_TVAztecaMember" name="TVAztecaMember" 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 abstract="true" id="amt_ThirdmeasurementperiodMember" name="ThirdmeasurementperiodMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_Threeyearperformancegrantsharesgranted" name="Threeyearperformancegrantsharesgranted" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="amt_Transactioncostspaid" name="Transactioncostspaid" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="amt_TwoPointEightZeroPercentSeniorNotesMemberMember" name="TwoPointEightZeroPercentSeniorNotesMemberMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_TwoThousandSevenPlanMember" name="TwoThousandSevenPlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="amt_VerizonTransactionMember" name="VerizonTransactionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>