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    <link:label id="lab_us-gaap_StatementLineItems_D213DA94C3A7E331CEF87A1FB6BFEF23_label_en-US" xlink:label="lab_us-gaap_StatementLineItems_D213DA94C3A7E331CEF87A1FB6BFEF23" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement [Line Items]</link:label>
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    <link:label id="lab_us-gaap_Land_F23347D00FD550AA793B7A1FB6C5173A_terseLabel_en-US" xlink:label="lab_us-gaap_Land_F23347D00FD550AA793B7A1FB6C5173A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Land</link:label>
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    <link:label id="lab_us-gaap_FurnitureAndFixturesGross_17F35621F83192E5EA4A7A1FB6C56DDA_terseLabel_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesGross_17F35621F83192E5EA4A7A1FB6C56DDA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Furniture, fixtures and equipment</link:label>
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    <link:loc xlink:href="maa-20170630.xsd#maa_GainsLossesOnExtinguishmentOfDebtIncludingDiscontinuedOperations" xlink:label="loc_maa_GainsLossesOnExtinguishmentOfDebtIncludingDiscontinuedOperations_E37442CC01DDF43E8D8C7A059033B825" xlink:type="locator" />
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    <link:label id="lab_maa_GainLossFromInsuranceSettlementAndOtherIncludingDiscontinuedOperations_25C99C65EF6E1D19CB447A059033D6EE_negatedLabel_en-US" xlink:label="lab_maa_GainLossFromInsuranceSettlementAndOtherIncludingDiscontinuedOperations_25C99C65EF6E1D19CB447A059033D6EE" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Net casualty loss and other settlement proceeds</link:label>
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    <link:label id="lab_maa_GainLossFromInsuranceSettlementAndOtherIncludingDiscontinuedOperations_25C99C65EF6E1D19CB447A059033D6EE_documentation_en-US" xlink:label="lab_maa_GainLossFromInsuranceSettlementAndOtherIncludingDiscontinuedOperations_25C99C65EF6E1D19CB447A059033D6EE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Gain Loss From Insurance Settlement And Other, Including Discontinued Operations</link:label>
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    <link:label id="lab_maa_PaymentsToAcquireRealEstateAndOtherAssets_8B265E00D812F077A4337A05903391D8_negatedLabel_en-US" xlink:label="lab_maa_PaymentsToAcquireRealEstateAndOtherAssets_8B265E00D812F077A4337A05903391D8" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchases of real estate and other assets</link:label>
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    <link:label id="lab_maa_PaymentsToAcquireRealEstateAndOtherAssets_8B265E00D812F077A4337A05903391D8_documentation_en-US" xlink:label="lab_maa_PaymentsToAcquireRealEstateAndOtherAssets_8B265E00D812F077A4337A05903391D8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures, and other related assets such as intangibles (in-place-leases) on it and so forth; includes real estate and other assets intended to generate income for the owner; excludes real estate acquired for use by the owner.</link:label>
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    <link:label id="lab_us-gaap_PaymentsForCapitalImprovements_D1FF69630BA04D4793DA7A059033ECC6_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsForCapitalImprovements_D1FF69630BA04D4793DA7A059033ECC6" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Normal capital improvements</link:label>
    <link:label id="lab_us-gaap_PaymentsForCapitalImprovements_D1FF69630BA04D4793DA7A059033ECC6_label_en-US" xlink:label="lab_us-gaap_PaymentsForCapitalImprovements_D1FF69630BA04D4793DA7A059033ECC6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for Capital Improvements</link:label>
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    <link:label id="lab_maa_ConstructionCapitalandOtherImprovements_ABBB414F3C52685BCD1B7A0590335A63_negatedTerseLabel_en-US" xlink:label="lab_maa_ConstructionCapitalandOtherImprovements_ABBB414F3C52685BCD1B7A0590335A63" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Construction capital and other improvements</link:label>
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    <link:label id="lab_maa_ConstructionCapitalandOtherImprovements_ABBB414F3C52685BCD1B7A0590335A63_documentation_en-US" xlink:label="lab_maa_ConstructionCapitalandOtherImprovements_ABBB414F3C52685BCD1B7A0590335A63" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Construction Capital and Other Improvements</link:label>
    <link:loc xlink:href="maa-20170630.xsd#maa_ConstructionCapitalandOtherImprovements" xlink:label="loc_maa_ConstructionCapitalandOtherImprovements_ABBB414F3C52685BCD1B7A0590335A63" xlink:type="locator" />
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    <link:label id="lab_maa_RenovationsToExistingRealEstateAssets_AF99238F5A6267ABFF337A05903340E2_negatedTerseLabel_en-US" xlink:label="lab_maa_RenovationsToExistingRealEstateAssets_AF99238F5A6267ABFF337A05903340E2" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Renovations to existing real estate assets</link:label>
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    <link:loc xlink:href="maa-20170630.xsd#maa_RenovationsToExistingRealEstateAssets" xlink:label="loc_maa_RenovationsToExistingRealEstateAssets_AF99238F5A6267ABFF337A05903340E2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToDevelopRealEstateAssets_CA894B0481F212FDA1677A059033E2F3_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToDevelopRealEstateAssets_CA894B0481F212FDA1677A059033E2F3" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Development</link:label>
    <link:label id="lab_us-gaap_PaymentsToDevelopRealEstateAssets_CA894B0481F212FDA1677A059033E2F3_label_en-US" xlink:label="lab_us-gaap_PaymentsToDevelopRealEstateAssets_CA894B0481F212FDA1677A059033E2F3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Develop Real Estate Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToDevelopRealEstateAssets" xlink:label="loc_us-gaap_PaymentsToDevelopRealEstateAssets_CA894B0481F212FDA1677A059033E2F3" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromDistributionsReceivedFromRealEstatePartnerships_F5B57E47CE1006047E0E7A0590331FFF_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromDistributionsReceivedFromRealEstatePartnerships_F5B57E47CE1006047E0E7A0590331FFF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Distributions from real estate joint ventures</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromDistributionsReceivedFromRealEstatePartnerships" xlink:label="loc_us-gaap_ProceedsFromDistributionsReceivedFromRealEstatePartnerships_F5B57E47CE1006047E0E7A0590331FFF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment_3ABD71B5F8B09B807E887A059033546E_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment_3ABD71B5F8B09B807E887A059033546E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from disposition of real estate assets</link:label>
    <link:label id="lab_us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment_3ABD71B5F8B09B807E887A059033546E_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment_3ABD71B5F8B09B807E887A059033546E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Sale of Real Estate Held-for-investment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment" xlink:label="loc_us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment_3ABD71B5F8B09B807E887A059033546E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_EscrowDepositsRelatedToPropertySales_E3E461C1BA1DDEB6207F7A05903366F6_terseLabel_en-US" xlink:label="lab_us-gaap_EscrowDepositsRelatedToPropertySales_E3E461C1BA1DDEB6207F7A05903366F6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">(Funding) return of escrow for future acquisitions</link:label>
    <link:label id="lab_us-gaap_EscrowDepositsRelatedToPropertySales_E3E461C1BA1DDEB6207F7A05903366F6_label_en-US" xlink:label="lab_us-gaap_EscrowDepositsRelatedToPropertySales_E3E461C1BA1DDEB6207F7A05903366F6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Escrow Deposits Related to Property Sales</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_90AB93A24A554C97E8917A0590335885_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_90AB93A24A554C97E8917A0590335885" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash (used in) provided by investing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_90AB93A24A554C97E8917A0590335885_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_90AB93A24A554C97E8917A0590335885" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_C64C039E4D10DC0D74F47A0590332923_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_C64C039E4D10DC0D74F47A0590332923" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from financing activities:</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_648712B13E1DFA49FF0C7A05903310AA_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_648712B13E1DFA49FF0C7A05903310AA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net change in credit lines</link:label>
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