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    <link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_7E598E692BBF3B2681A1AA544833F219_terseLabel_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_7E598E692BBF3B2681A1AA544833F219" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">New accounting prounouncements</link:label>
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    <link:label id="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6E7610A4308C7E85BE01071B236F386A_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6351360919FF53D9B76B89EBAC23D00F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party [Axis]</link:label>
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    <link:label id="lab_us-gaap_RelatedPartyDomain_FA27B79F136C2FC9197C071B236FE3F4_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyDomain_05CB3CE35F185A5EB6DCB2A731390373" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related Party [Domain]</link:label>
    <link:label id="lab_us-gaap_RelatedPartyDomain_FA27B79F136C2FC9197C071B236FE3F4_label_en-US" xlink:label="lab_us-gaap_RelatedPartyDomain_05CB3CE35F185A5EB6DCB2A731390373" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party [Domain]</link:label>
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    <link:label id="lab_us-gaap_IncomeStatementAbstract_63197C56614642C4F51E071B236FD1AE_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract_976EA5D964275138A4BE5C5AED083ADF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Statement [Abstract]</link:label>
    <link:label id="lab_us-gaap_IncomeStatementAbstract_63197C56614642C4F51E071B236FD1AE_label_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract_976EA5D964275138A4BE5C5AED083ADF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement [Abstract]</link:label>
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    <link:label id="lab_us-gaap_OperatingLeasesIncomeStatementLeaseRevenue_97FE34A8B460B08514AA071B236FCF0B_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesIncomeStatementLeaseRevenue_DA004D5833A154C89FF60F474CF9F200" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Site rental revenues</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesIncomeStatementLeaseRevenue_97FE34A8B460B08514AA071B236FCF0B_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesIncomeStatementLeaseRevenue_DA004D5833A154C89FF60F474CF9F200" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Income Statement, Lease Revenue</link:label>
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    <link:label id="lab_us-gaap_OperatingExpensesAbstract_CBA869F618961164635A071B236F4172_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_59416DF1EB9E5690B851B5629B230418" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating expenses:</link:label>
    <link:label id="lab_us-gaap_OperatingExpensesAbstract_CBA869F618961164635A071B236F4172_label_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_59416DF1EB9E5690B851B5629B230418" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Expenses [Abstract]</link:label>
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    <link:label id="lab_cci_DirectCostsOfLeasedAndRentedPropertyOrEquipmentThirdParty_F3360ED25C908FF18CCF071B236F0789_terseLabel_en-US" xlink:label="lab_cci_DirectCostsOfLeasedAndRentedPropertyOrEquipmentThirdParty_404AC09906E658FC831324708C6E1E9F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Site rental cost of operations&#8212;third parties</link:label>
    <link:label id="lab_cci_DirectCostsOfLeasedAndRentedPropertyOrEquipmentThirdParty_F3360ED25C908FF18CCF071B236F0789_label_en-US" xlink:label="lab_cci_DirectCostsOfLeasedAndRentedPropertyOrEquipmentThirdParty_404AC09906E658FC831324708C6E1E9F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Direct Costs of Leased and Rented Property or Equipment, Third Party</link:label>
    <link:label id="lab_cci_DirectCostsOfLeasedAndRentedPropertyOrEquipmentThirdParty_F3360ED25C908FF18CCF071B236F0789_documentation_en-US" xlink:label="lab_cci_DirectCostsOfLeasedAndRentedPropertyOrEquipmentThirdParty_404AC09906E658FC831324708C6E1E9F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Costs incurred with third parties that are directly related to generating revenues from leased and rented property or equipment.</link:label>
    <link:loc xlink:href="cci-20170331.xsd#cci_DirectCostsOfLeasedAndRentedPropertyOrEquipmentThirdParty" xlink:label="loc_cci_DirectCostsOfLeasedAndRentedPropertyOrEquipmentThirdParty_404AC09906E658FC831324708C6E1E9F" xlink:type="locator" />
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    <link:label id="lab_cci_DirectCostsOfLeasedAndRentedPropertyOrEquipmentRelatedParty_EB6EA4EE04B7C945F69C071B237084CB_terseLabel_en-US" xlink:label="lab_cci_DirectCostsOfLeasedAndRentedPropertyOrEquipmentRelatedParty_B47F4603F444583EAC381FEB21953D0A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Site rental cost of operations&#8212;related parties</link:label>
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    <link:label id="lab_cci_DirectCostsOfLeasedAndRentedPropertyOrEquipmentRelatedParty_EB6EA4EE04B7C945F69C071B237084CB_documentation_en-US" xlink:label="lab_cci_DirectCostsOfLeasedAndRentedPropertyOrEquipmentRelatedParty_B47F4603F444583EAC381FEB21953D0A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Costs incurred with related parties that are directly related to generating revenues from leased and rented property or equipment.</link:label>
    <link:loc xlink:href="cci-20170331.xsd#cci_DirectCostsOfLeasedAndRentedPropertyOrEquipmentRelatedParty" xlink:label="loc_cci_DirectCostsOfLeasedAndRentedPropertyOrEquipmentRelatedParty_B47F4603F444583EAC381FEB21953D0A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cci_DirectCostsOfLeasedAndRentedPropertyOrEquipmentRelatedParty_B47F4603F444583EAC381FEB21953D0A" xlink:to="lab_cci_DirectCostsOfLeasedAndRentedPropertyOrEquipmentRelatedParty_B47F4603F444583EAC381FEB21953D0A" xlink:type="arc" />
    <link:label id="lab_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment_16CE36A28EE8A7B80962071B2370C0F9_terseLabel_en-US" xlink:label="lab_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment_9BAEC4ADA5E35011A6BC696932D87BCA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Site rental cost of operations&#8212;total</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment" xlink:label="loc_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment_9BAEC4ADA5E35011A6BC696932D87BCA" xlink:type="locator" />
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    <link:label id="lab_cci_ManagementFeeExpenseRelatedParty_EC474B4A3AE3175F2E94071B2370E1F4_terseLabel_en-US" xlink:label="lab_cci_ManagementFeeExpenseRelatedParty_3B5BBDEB855759C29CAE67AE9D2FCF65" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Management fee&#8212;related party</link:label>
    <link:label id="lab_cci_ManagementFeeExpenseRelatedParty_EC474B4A3AE3175F2E94071B2370E1F4_label_en-US" xlink:label="lab_cci_ManagementFeeExpenseRelatedParty_3B5BBDEB855759C29CAE67AE9D2FCF65" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Management Fee Expense Related Party</link:label>
    <link:label id="lab_cci_ManagementFeeExpenseRelatedParty_EC474B4A3AE3175F2E94071B2370E1F4_documentation_en-US" xlink:label="lab_cci_ManagementFeeExpenseRelatedParty_3B5BBDEB855759C29CAE67AE9D2FCF65" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of expenses charged by affiliate related to the management services to maintain, market, operate, manage and administer the towers.</link:label>
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    <link:label id="lab_us-gaap_AssetImpairmentCharges_4C414D352BA7FFC6E624071B2370E302_terseLabel_en-US" xlink:label="lab_us-gaap_AssetImpairmentCharges_0C2EF6C10F265381B7E72ED6A1C0B7DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset write-down charges</link:label>
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