Mid-America Apartments 10-Q 28 Oct 21 2021 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Oct. 25, 2021
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Entity Registrant Name	MID-AMERICA APARTMENT COMMUNITIES, INC.
Entity Central Index Key	0000912595
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		115,138,323
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Emerging Growth Company	false
Entity Small Business	false
Entity File Number	001-12762
Entity Incorporation, State or Country Code	TN
Entity Tax Identification Number	62-1543819
Entity Address, Address Line One	6815 Poplar Ave
Entity Address, Address Line Two	Suite 500
Entity Address, City or Town	Germantown
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	38138
City Area Code	901
Local Phone Number	682-6600
Document Quarterly Report	true
Document Transition Report	false
Common Stock [Member]
Document Information [Line Items]
Security Exchange Name	NYSE
Trading Symbol	MAA
Title of 12(b) Security	Common Stock
Cumulative Preferred Stock [Member]
Document Information [Line Items]
Security Exchange Name	NYSE
Trading Symbol	MAA*I
Title of 12(b) Security	8.50% Series I Cumulative Redeemable Preferred Stock
Limited Partner [Member]
Document Information [Line Items]
Entity Registrant Name	MID-AMERICA APARTMENTS, L.P.
Entity Central Index Key	0001581776
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	false
Entity File Number	333-190028-01
Entity Tax Identification Number	62-1543816
Entity Address, Address Line One	6815 Poplar Ave
Entity Address, Address Line Two	Suite 500
Entity Address, City or Town	Germantown
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	38138
City Area Code	901
Local Phone Number	682-6600

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Assets
Land		$ 1,977,813	$ 1,929,181
Buildings and improvements and other		12,369,733	12,065,244
Development and capital improvements in progress		236,339	283,477
Real Estate Investment Property, at Cost		14,583,885	14,277,902
Less: Accumulated depreciation		(3,722,917)	(3,415,105)
Real Estate Investment Property, Net		10,860,968	10,862,797
Undeveloped land		29,115	60,993
Investment in real estate joint venture		42,842	43,325
Real estate assets, net		10,932,925	10,967,115
Cash and cash equivalents		29,811	25,198
Restricted cash		11,710	10,417
Other assets		237,245	192,061
Assets held for sale		42,441	0
Total assets		11,254,132	11,194,791
Liabilities:
Unsecured notes payable		4,175,256	4,077,373
Secured notes payable		365,631	485,339
Accrued expenses and other liabilities		598,592	528,274
Total liabilities		5,139,479	5,090,986
Redeemable common stock		24,323	15,397
Shareholders’ equity:
Preferred Stock, Value, Outstanding		9	9
Common stock	[1]	1,149	1,141
Additional paid-in capital		7,216,885	7,176,793
Accumulated distributions in excess of net income		(1,309,511)	(1,294,182)
Accumulated other comprehensive loss		(11,384)	(12,128)
Total MAA shareholders’ equity		5,897,148	5,871,633
Noncontrolling interests - OP Units		173,366	206,927
Total Company’s shareholders’ equity		6,070,514	6,078,560
Noncontrolling interests - consolidated real estate entities		19,816	9,848
Total equity		6,090,330	6,088,408
Total liabilities and equity		$ 11,254,132	$ 11,194,791
[1]	Number of shares issued and outstanding represents total shares of common stock regardless of classification on the Condensed Consolidated Balance Sheets. The number of shares classified as redeemable common stock on the Condensed Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020 are 130,242 and 121,534 , respectively.

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - $ / shares	9 Months Ended		12 Months Ended
	Sep. 30, 2021		Dec. 31, 2020
Statement Of Financial Position [Abstract]
Common stock, par value per share	$ 0.01		$ 0.01
Common stock, shares authorized	145,000,000		145,000,000
Common stock, shares issued	115,138,323		114,373,727
Common stock, shares outstanding	115,138,323		114,373,727
Preferred Stock, Par or Stated Value Per Share	$ 0.01		$ 0.01
Preferred Stock, Shares Authorized	20,000,000		20,000,000
Preferred Stock, Dividend Rate, Percentage	8.50%		8.50%
Preferred Stock, Shares Issued	867,846		867,846
Preferred Stock, Shares Outstanding	867,846		867,846
Preferred Stock, Liquidation Preference Per Share	$ 50	[1]	$ 50
Redeemable stock, shares issued and outstanding	130,242		121,534
[1]	The total liquidation preference for the outstanding preferred stock is $ 43.4 million .

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Rental and other property revenues	$ 452,575	$ 423,199	$ 1,314,507	$ 1,254,323
Expenses:
Operating expenses, excluding real estate taxes and insurance	106,412	105,108	304,124	292,031
Real estate taxes and insurance	66,426	64,706	199,943	188,426
Depreciation and amortization	134,611	127,679	397,938	381,257
Total property operating expenses	307,449	297,493	902,005	861,714
Property management expenses	13,831	12,691	40,522	39,064
General and administrative expenses	12,670	11,360	38,763	35,181
Interest expense	39,234	41,010	117,773	126,610
Loss (gain) on sale of depreciable real estate assets	313	(20)	(134,515)	7
Gain on sale of non-depreciable real estate assets	(170)	(1,366)	(202)	(995)
Other non-operating (income) expense	(10,344)	(242)	(14,557)	13,647
Income before income tax expense	89,592	62,273	364,718	179,095
Income tax expense	(2,803)	(665)	(5,847)	(2,532)
Income from continuing operations before real estate joint venture activity	86,789	61,608	358,871	176,563
Income from real estate joint venture	258	428	915	1,153
Net income	87,047	62,036	359,786	177,716
Net income attributable to noncontrolling interests	2,568	2,126	11,636	6,096
Net income available for shareholders	84,479	59,910	348,150	171,620
Dividends to MAA Series I preferred shareholders	922	922	2,766	2,766
Net income available for MAA common shareholders	$ 83,557	$ 58,988	$ 345,384	$ 168,854
Earnings per common share - basic:
Net income available for MAA common shareholders	$ 0.73	$ 0.52	$ 3.01	$ 1.48
Earnings per common share - diluted:
Net income available for MAA common shareholders	$ 0.73	$ 0.52	$ 3.01	$ 1.47

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net income	$ 87,047	$ 62,036	$ 359,786	$ 177,716
Other comprehensive income:
Adjustment for net losses reclassified to net income from derivative instruments	278	279	835	810
Total comprehensive income	87,325	62,315	360,621	178,526
Less: Comprehensive income attributable to noncontrolling interests	(2,598)	(2,136)	(11,727)	(6,124)
Comprehensive income	84,727	60,179	348,894	172,402
Limited Partner [Member]
Net income	87,047	62,036	359,786	177,716
Other comprehensive income:
Adjustment for net losses reclassified to net income from derivative instruments	278	279	835	810
Comprehensive income	$ 87,325	$ 62,315	$ 360,621	$ 178,526

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 359,786	$ 177,716
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	398,678	381,938
(Gain) loss on sale of depreciable real estate assets	(134,515)	7
Gain on sale of non-depreciable real estate assets	(202)	(995)
(Gain) loss on embedded derivative in preferred shares	(11,492)	14,603
Stock compensation expense	12,804	12,532
Amortization of debt issuance costs, discounts and premiums	4,142	3,595
Net change in operating accounts and other operating activities	49,049	54,489
Net cash provided by operating activities	678,250	643,885
Cash flows from investing activities:
Purchases of real estate and other assets	(46,028)	(5,004)
Capital improvements, development and other	(388,373)	(288,183)
Distributions from real estate joint venture	483	207
Contributions to affiliates	(1,971)	(3,450)
Proceeds from disposition of real estate assets	166,234	3,278
Net cash used in investing activities	(269,655)	(293,152)
Cash flows from financing activities:
Proceeds from revolving credit facility		245,000
Repayments of revolving credit facility		(245,000)
Net payments on commercial paper	(147,000)	(35,000)
Proceeds from notes payable	594,423	447,593
Principal payments on notes payable	(466,817)	(440,222)
Payment of deferred financing costs	(5,922)	(4,196)
Distributions to noncontrolling interests	(12,009)	(11,993)
Dividends paid on common shares	(352,384)	(342,983)
Dividends paid on preferred shares	(2,766)	(2,766)
Net change in other financing activities	(10,214)	(4,118)
Net cash used in financing activities	(402,689)	(393,685)
Net increase (decrease) in cash, cash equivalents and restricted cash	5,906	(42,952)
Cash, cash equivalents and restricted cash, beginning of period	35,615	70,541
Cash, cash equivalents and restricted cash, end of period	41,521	27,589
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	29,811	18,407
Restricted cash	11,710	9,182
Cash, cash equivalents and restricted cash, end of period	41,521	27,589
Supplemental disclosure of cash flow information:
Interest paid	109,471	109,527
Income taxes paid	2,518	2,534
Supplemental disclosure of noncash investing and financing activities:
Conversion of OP Units to shares of common stock	33,272	471
Accrued construction in progress	18,484	41,443
Interest capitalized	7,781	4,783
Limited Partner [Member]
Cash flows from operating activities:
Net income	359,786	177,716
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	398,678	381,938
(Gain) loss on sale of depreciable real estate assets	(134,515)	7
Gain on sale of non-depreciable real estate assets	(202)	(995)
(Gain) loss on embedded derivative in preferred shares	(11,492)	14,603
Stock compensation expense	12,804	12,532
Amortization of debt issuance costs, discounts and premiums	4,142	3,595
Net change in operating accounts and other operating activities	49,049	54,489
Net cash provided by operating activities	678,250	643,885
Cash flows from investing activities:
Purchases of real estate and other assets	(46,028)	(5,004)
Capital improvements, development and other	(388,373)	(288,183)
Distributions from real estate joint venture	483	207
Contributions to affiliates	(1,971)	(3,450)
Proceeds from disposition of real estate assets	166,234	3,278
Net cash used in investing activities	(269,655)	(293,152)
Cash flows from financing activities:
Proceeds from revolving credit facility		245,000
Repayments of revolving credit facility		(245,000)
Net payments on commercial paper	(147,000)	(35,000)
Proceeds from notes payable	594,423	447,593
Principal payments on notes payable	(466,817)	(440,222)
Payment of deferred financing costs	(5,922)	(4,196)
Dividends paid on common shares	(364,393)	(354,976)
Dividends paid on preferred shares	(2,766)	(2,766)
Net change in other financing activities	(10,214)	(4,118)
Net cash used in financing activities	(402,689)	(393,685)
Net increase (decrease) in cash, cash equivalents and restricted cash	5,906	(42,952)
Cash, cash equivalents and restricted cash, beginning of period	35,615	70,541
Cash, cash equivalents and restricted cash, end of period	41,521	27,589
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	29,811	18,407
Restricted cash	11,710	9,182
Cash, cash equivalents and restricted cash, end of period	41,521	27,589
Supplemental disclosure of cash flow information:
Interest paid	109,471	109,527
Income taxes paid	2,518	2,534
Supplemental disclosure of noncash investing and financing activities:
Accrued construction in progress	18,484	41,443
Interest capitalized	$ 7,781	$ 4,783

Condensed Consolidated Balanc_3

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Assets
Land		$ 1,977,813	$ 1,929,181
Buildings and improvements and other		12,369,733	12,065,244
Development and capital improvements in progress		236,339	283,477
Real Estate Investment Property, at Cost		14,583,885	14,277,902
Less: Accumulated depreciation		(3,722,917)	(3,415,105)
Real Estate Investment Property, Net		10,860,968	10,862,797
Investment in real estate joint venture		42,842	43,325
Real estate assets, net		10,932,925	10,967,115
Cash and cash equivalents		29,811	25,198
Restricted cash		11,710	10,417
Other assets		237,245	192,061
Assets held for sale		42,441	0
Total assets		11,254,132	11,194,791
Liabilities:
Unsecured notes payable		4,175,256	4,077,373
Secured notes payable		365,631	485,339
Accrued expenses and other liabilities		598,592	528,274
Total liabilities		5,139,479	5,090,986
Redeemable common stock		24,323	15,397
Operating Partnership capital:
Accumulated other comprehensive loss		(11,384)	(12,128)
Noncontrolling interests - consolidated real estate entities		19,816	9,848
Total equity		6,090,330	6,088,408
Total liabilities and equity		11,254,132	11,194,791
Limited Partner [Member]
Assets
Land		1,977,813	1,929,181
Buildings and improvements and other		12,369,733	12,065,244
Development and capital improvements in progress		236,339	283,477
Real Estate Investment Property, at Cost		14,583,885	14,277,902
Less: Accumulated depreciation		(3,722,917)	(3,415,105)
Real Estate Investment Property, Net		10,860,968	10,862,797
Undeveloped land		29,115	60,993
Investment in real estate joint venture		42,842	43,325
Real estate assets, net		10,932,925	10,967,115
Cash and cash equivalents		29,811	25,198
Restricted cash		11,710	10,417
Other assets		237,245	192,061
Assets held for sale		42,441	0
Total assets		11,254,132	11,194,791
Liabilities:
Unsecured notes payable		4,175,256	4,077,373
Secured notes payable		365,631	485,339
Accrued expenses and other liabilities		598,592	528,274
Due to general partner		19	19
Total liabilities		5,139,498	5,091,005
Redeemable common stock		24,323	15,397
Operating Partnership capital:
Preferred Units, Preferred Partners' Capital Accounts		66,840	66,840
General Partners' Capital Account	[1]	5,841,950	5,817,270
Limited Partners' Capital Account	[1]	173,366	206,927
Accumulated other comprehensive loss		(11,661)	(12,496)
Total operating partners’ capital		6,070,495	6,078,541
Noncontrolling interests - consolidated real estate entities		19,816	9,848
Total equity		6,090,311	6,088,389
Total liabilities and equity		$ 11,254,132	$ 11,194,791
[1]	Number of units outstanding represents total OP Units regardless of classification on the Condensed Consolidated Balance Sheets. The number of units classified as redeemable common units on the Condensed Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020 are 130,242 and 121,534 , respectively.

Condensed Consolidated Balanc_4

Condensed Consolidated Balance Sheets (Parenthetical) - shares	Sep. 30, 2021	Dec. 31, 2020
General Partners' Capital Account, Units Outstanding	115,138,323
Limited Partners' Capital Account, Units Outstanding	3,402,682
Redeemable stock, shares issued and outstanding	130,242	121,534
Limited Partner [Member]
General Partners' Capital Account, Units Outstanding	115,138,323	114,373,727
Limited Partners' Capital Account, Units Outstanding	3,402,682	4,057,657
Preferred Units, Issued	867,846	867,846
Preferred Units, Outstanding	867,846	867,846
Redeemable stock, shares issued and outstanding	130,242	121,534

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Operations (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Rental and other property revenues	$ 452,575	$ 423,199	$ 1,314,507	$ 1,254,323
Expenses:
Operating expenses, excluding real estate taxes and insurance	106,412	105,108	304,124	292,031
Real estate taxes and insurance	66,426	64,706	199,943	188,426
Depreciation and amortization	134,611	127,679	397,938	381,257
Total property operating expenses	307,449	297,493	902,005	861,714
Property management expenses	13,831	12,691	40,522	39,064
General and administrative expenses	12,670	11,360	38,763	35,181
Interest expense	39,234	41,010	117,773	126,610
Loss (gain) on sale of depreciable real estate assets	313	(20)	(134,515)	7
Gain on sale of non-depreciable real estate assets	(170)	(1,366)	(202)	(995)
Other non-operating (income) expense	(10,344)	(242)	(14,557)	13,647
Income before income tax expense	89,592	62,273	364,718	179,095
Income tax expense	(2,803)	(665)	(5,847)	(2,532)
Income from continuing operations before real estate joint venture activity	86,789	61,608	358,871	176,563
Income from real estate joint venture	258	428	915	1,153
Net income	87,047	62,036	359,786	177,716
Distributions to MAALP preferred unitholders	922	922	2,766	2,766
Net income available for MAA common shareholders	83,557	58,988	345,384	168,854
Limited Partner [Member]
Revenues:
Rental and other property revenues	452,575	423,199	1,314,507	1,254,323
Expenses:
Operating expenses, excluding real estate taxes and insurance	106,412	105,108	304,124	292,031
Real estate taxes and insurance	66,426	64,706	199,943	188,426
Depreciation and amortization	134,611	127,679	397,938	381,257
Total property operating expenses	307,449	297,493	902,005	861,714
Property management expenses	13,831	12,691	40,522	39,064
General and administrative expenses	12,670	11,360	38,763	35,181
Interest expense	39,234	41,010	117,773	126,610
Loss (gain) on sale of depreciable real estate assets	313	(20)	(134,515)	7
Gain on sale of non-depreciable real estate assets	170	1,366	202	995
Other non-operating (income) expense	10,344	242	14,557	(13,647)
Income before income tax expense	89,592	62,273	364,718	179,095
Income tax expense	2,803	665	5,847	2,532
Income from continuing operations before real estate joint venture activity	86,789	61,608	358,871	176,563
Income from real estate joint venture	258	428	915	1,153
Net income	87,047	62,036	359,786	177,716
Distributions to MAALP preferred unitholders	922	922	2,766	2,766
Net income available for MAA common shareholders	$ 86,125	$ 61,114	$ 357,020	$ 174,950
Earnings per common share - basic:
Net income available for MAALP common unitholders	$ 0.73	$ 0.52	$ 3.01	$ 1.48
Earnings per common share - diluted:
Net income available for MAALP common unitholders	$ 0.73	$ 0.52	$ 3.01	$ 1.48

Basis of Presentation and Princ

Basis of Presentation and Principles of Consolidation and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2021
Consolidation And Basis Of Presentation And Significant Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation and Significant Accounting Policies	1. Basis of Presentation and Principles of Consolidation and Significant Accounting Policies Unless the context otherwise requires, all references to the “Company” refer collectively to Mid-America Apartment Communities, Inc., together with its consolidated subsidiaries, including Mid-America Apartments, L.P. Unless the context otherwise requires, all references to “MAA” refer only to Mid-America Apartment Communities, Inc., and not any of its consolidated subsidiaries. Unless the context otherwise requires, the references to the “Operating Partnership” or “MAALP” refer to Mid-America Apartments, L.P., together with its consolidated subsidiaries. “Common stock” refers to the common stock of MAA and, unless the context otherwise requires, “shareholders” refers to the holders of shares of MAA’s common stock. The common units of limited partnership interests in the Operating Partnership are referred to as “OP Units,” and the holders of the OP Units are referred to as “common unitholders”. As of September 30, 2021, MAA owned 115,138,323 OP Units (or 97.1 % of the total number of OP Units). MAA conducts substantially all of its business and holds substantially all of its assets, directly or indirectly, through the Operating Partnership, and by virtue of its ownership of the OP Units and being the Operating Partnership’s sole general partner, MAA has the ability to control all of the day-to-day operations of the Operating Partnership. Management believes combining the notes to the condensed consolidated financial statements of MAA and the Operating Partnership results in the following benefits:  enhances a readers’ understanding of MAA and the Operating Partnership by enabling the reader to view the business as a whole in the same manner that management views and operates the business;  eliminates duplicative disclosure and provides a more streamlined and readable presentation since a substantial portion of the disclosure applies to both MAA and the Operating Partnership; and  creates time and cost efficiencies through the preparation of one combined set of notes instead of two separate sets. MAA, an S&P 500 company, is a multifamily-focused, self-administered and self-managed real estate investment trust, or REIT. Management operates MAA and the Operating Partnership as one business. The management of the Company is comprised of individuals who are officers of MAA and employees of the Operating Partnership. Management believes it is important to understand the few differences between MAA and the Operating Partnership in the context of how MAA and the Operating Partnership operate as a consolidated company. MAA and the Operating Partnership are structured as an umbrella partnership REIT, or UPREIT. MAA’s interest in the Operating Partnership entitles MAA to share in cash distributions from, and in the profits and losses of, the Operating Partnership in proportion to MAA’s percentage interest therein and entitles MAA to vote on substantially all matters requiring a vote of the partners. MAA’s only material asset is its ownership of limited partnership interests in the Operating Partnership (other than cash held by MAA from time to time); therefore, MAA’s primary function is acting as the sole general partner of the Operating Partnership, issuing public equity from time to time and guaranteeing certain debt of the Operating Partnership from time to time. The Operating Partnership holds, directly or indirectly, all of the Company’s real estate assets. Except for net proceeds from public equity issuances by MAA, which are contributed to the Operating Partnership in exchange for limited partnership interests, the Operating Partnership generates the capital required by the business through the Operating Partnership’s operations, direct or indirect incurrence of indebtedness and issuance of OP Units. The presentations of MAA’s shareholders’ equity and the Operating Partnership’s capital are the principal areas of difference between the condensed consolidated financial statements of MAA and those of the Operating Partnership. MAA’s shareholders’ equity may include shares of preferred stock, shares of common stock, additional paid-in capital, cumulative earnings, cumulative distributions, noncontrolling interests, treasury shares, accumulated other comprehensive loss and redeemable common stock. The Operating Partnership’s capital may include common capital and preferred capital of the general partner (MAA), limited partners’ common capital and preferred capital, noncontrolling interests, accumulated other comprehensive loss and redeemable common units. Holders of OP Units (other than MAA) may require the Operating Partnership to redeem their OP Units from time to time, in which case the Operating Partnership may, at its option, pay the redemption price either in cash (in an amount per OP Unit equal, in general, to the average closing price of MAA’s common stock on the New York Stock Exchange, or NYSE, over a specified period prior to the redemption date) or by delivering one share of MAA’s common stock (subject to adjustment under specified circumstances) for each OP Unit so redeemed. Organization of Mid-America Apartment Communities, Inc. The Company owns, operates, acquires and selectively develops apartment communities primarily located in the Southeast, Southwest and Mid-Atlantic regions of the United States. As of September 30, 2021, the Company owned and operated 296 apartment communities through the Operating Partnership and its subsidiaries and had an ownership interest in one apartment community through an unconsolidated real estate joint venture. As of September 30, 2021, the Company also had eight development communities under construction totaling 2,654 apartment units once complete. Total expected costs for the eight development projects are $ 627.5 million , of which $ 383.8 million had been incurred through September 30, 2021 . The Company expects to complete three of these developments in 2021, two developments in 2022 and three developments in 2023. As of September 30, 2021, 32 of the Company’s apartment communities included retail components. The Company’s apartment communities, including development communities under construction, were located across 16 states and the District of Columbia as of September 30, 2021. Basis of Presentation and Principles of Consolidation The accompanying condensed consolidated financial statements have been prepared by the Company’s management in accordance with United States generally accepted accounting principles, or GAAP, and applicable rules and regulations of the Securities and Exchange Commission, or the SEC. The condensed consolidated financial statements of MAA presented herein include the accounts of MAA, the Operating Partnership and all other subsidiaries in which MAA has a controlling financial interest. MAA owns, directly or indirectly, approximately 80 % to 100 % of all consolidated subsidiaries, including the Operating Partnership. The condensed consolidated financial statements of MAALP presented herein include the accounts of MAALP and all other subsidiaries in which MAALP has a controlling financial interest. MAALP owns, directly or indirectly, 80 % to 100 % of all consolidated subsidiaries. In management’s opinion, all adjustments necessary for a fair presentation of the condensed consolidated financial statements have been included, and all such adjustments were of a normal recurring nature. All significant intercompany accounts and transactions have been eliminated in consolidation. The Company invests in entities which may qualify as variable interest entities, or VIEs, and MAALP is considered a VIE. A VIE is a legal entity in which the equity investors lack sufficient equity at risk for the entity to finance its activities without additional subordinated financial support or, as a group, the holders of the equity investment at risk lack the power to direct the activities of a legal entity as well as the obligation to absorb its expected losses or the right to receive its expected residual returns. MAALP is classified as a VIE because the limited partners lack substantive kick-out rights and substantive participating rights. The Company consolidates all VIEs for which it is the primary beneficiary and uses the equity method to account for investments that qualify as VIEs but for which it is not the primary beneficiary. In determining whether the Company is the primary beneficiary of a VIE, management considers both qualitative and quantitative factors, including, but not limited to, those activities that most significantly impact the VIE’s economic performance and which party controls such activities. The Company uses the equity method of accounting for its investments in entities for which the Company exercises significant influence, but does not have the ability to exercise control. The factors considered in determining whether the Company has the ability to exercise control include ownership of voting interests and participatory rights of investors (see “Investments in Unconsolidated Affiliates” below). Noncontrolling Interests As of September 30, 2021, the Company had two types of noncontrolling interests with respect to its consolidated subsidiaries: (1) noncontrolling interests related to the common unitholders of its Operating Partnership; and (2) noncontrolling interests related to its consolidated real estate entities. The noncontrolling interests relating to the limited partnership interests in the Operating Partnership are owned by the holders of the Class A OP Units. MAA is the sole general partner of the Operating Partnership and holds all of the outstanding Class B OP Units. Net income (after allocations to preferred ownership interests) is allocated to MAA and the noncontrolling interests based on their respective ownership percentages of the Operating Partnership. Issuance of additional Class A OP Units or Class B OP Units changes the ownership percentage of both the noncontrolling interests and MAA. The issuance of Class B OP Units generally occurs when MAA issues common stock and the issuance proceeds are contributed to the Operating Partnership in exchange for Class B OP Units equal to the number of shares of MAA’s common stock issued. At each reporting period, the allocation between total MAA shareholders’ equity and noncontrolling interests is adjusted to account for the change in the respective percentage ownership of the underlying equity of the Operating Partnership. MAA’s Board of Directors established economic rights in respect to each Class A OP Unit that were equivalent to the economic rights in respect to each share of MAA common stock. See Note 9 for additional details. The noncontrolling interests relating to the Company’s five consolidated real estate entities are owned by private real estate companies that are generally responsible for the development and construction of the apartment communities that are owned through the consolidated real estate entities with a noncontrolling interest. The entities were determined to be VIE’s with the Company designated as the primary beneficiary. As a result, the accounts of the entities are consolidated by the Company. As of September 30, 2021, the consolidated assets and liabilities of the Company’s consolidated real estate entities with a noncontrolling interest were $ 218.8 million and $ 15.3 million , respectively. As of December 31, 2020, the consolidated assets and liabilities of the Company’s consolidated real estate entities with a noncontrolling interest were $ 128.9 million and $ 8.1 million , respectively. Investments in Unconsolidated Affiliates The Company uses the equity method to account for its investments in a real estate joint venture and two technology-focused limited partnerships that each qualify as a VIE. Management determined the Company is not the primary beneficiary in any of these investments but does have the ability to exert significant influence over the operations and financial policies of the real estate joint venture and considers its investments in the limited partnerships to be more than minor. The Company’s investment in the real estate joint venture was $ 42.8 million and $ 43.3 million as of September 30, 2021 and December 31, 2020, respectively. As of September 30, 2021 and December 31, 2020, the Company’s investments in the technology-focused limited partnerships were $ 43.0 million and $ 23.0 million , respectively, and are included in “Other assets” in the accompanying Condensed Consolidated Balance Sheets. As of September 30, 2021, the Company was committed until February 2025 to make additional capital contributions totaling $ 18.7 million if and when called by the general partners of the limited partnerships. Fair Value Measurements The Company applies the guidance in Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures , to the valuation of real estate assets recorded at fair value, to its impairment valuation analysis of real estate assets, to its disclosure of the fair value of financial instruments, principally indebtedness and to its derivative financial instruments. Fair value disclosures required under ASC Topic 820 as well as the Company’s derivative accounting policies are summarized in Note 7 utilizing the following hierarchy: Level 1 - Quoted prices in active markets for identical assets or liabilities that are accessible at the measurement date. Level 2 - Inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly. Level 3 - Unobservable inputs for the assets or liability. Revenue Recognition The Company primarily leases multifamily residential apartments to residents under operating leases generally due on a monthly basis with terms of approximately one year or less. Rental revenues are recognized in accordance with ASC Topic 842, Leases , using a method that represents a straight-line basis over the term of the lease. In addition, in circumstances where a lease incentive is provided to tenants, the incentive is recognized as a reduction of rental revenues on a straight-line basis over the reasonably assured lease term. Rental revenues represent approximately 93% of the Company’s total revenues and include gross rents charged less adjustments for concessions and bad debt. Approximately 6% of the Company’s total revenues represent non-lease reimbursable property revenues from its residents for utility reimbursements, which are generally recognized and due on a monthly basis as residents obtain control of the service over the term of the lease. The remaining 1% of the Company’s total revenues represents other non-lease property revenues primarily driven by nonrefundable fees and commissions. In accordance with ASC Topic 842, rental revenues and non-lease reimbursable property revenues meet the criteria to be aggregated into a single lease component and are reported on a combined basis in the line item “Rental revenues”, as presented in the disaggregation of the Company’s revenues in Note 11. Other non-lease property revenues are accounted for in accordance with ASC Topic 606, Revenue from Contracts with Customers , which requires revenue recognized outside of the scope of ASC Topic 842 to be recognized when a customer obtains control of promised goods or services in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. Other non-lease property revenues are reported in the line item “Other property revenues”, as presented in the disaggregation of the Company’s revenues in Note 11. Leases The Company is the lessee under certain ground, office, equipment and other operational leases, all of which are accounted for as operating leases in accordance with ASC Topic 842. The Company recognizes a right-of-use asset for the right to use the underlying asset for all leases where the Company is the lessee with terms of more than twelve months, and a related lease liability for the obligation to make lease payments. Expenses related to leases determined to be operating leases are recognized on a straight-line basis. As of September 30, 2021 and December 31, 2020, right-of-use assets recorded within “Other assets” totaled $ 47.7 million and $ 49.4 million , respectively, and related lease obligations recorded within “Accrued expenses and other liabilities” totaled $ 30.7 million and $ 31.7 million , respectively, in the Condensed Consolidated Balance Sheets. As of September 30, 2021, the Company’s operating leases had a weighted average remaining lease term of approximately 32 years and a weighted average discount rate of approximately 4.4 % . Lease expense recognized for the three and nine months ended September 30, 2021 and 2020 was immaterial to the Company. Cash paid for amounts included in the measurement of operating lease liabilities during the nine months ended September 30, 2021 and 2020 was also immaterial.

Earnings Per Common Share of MA

Earnings Per Common Share of MAA	9 Months Ended
	Sep. 30, 2021
Earnings Per Common Share Of M A A [Abstract]
Earnings per Common Share of MAA	2. Earnings per Common Share of MAA Basic earnings per share is computed by dividing net income available to MAA common shareholders by the weighted average number of common shares outstanding during the period. All outstanding unvested restricted share awards contain rights to non-forfeitable dividends and participate in undistributed earnings with shareholders and, accordingly, are considered participating securities that are included in the two-class method of computing basic earnings per share. Both the unvested restricted shares and other potentially dilutive common shares, and the related impact to earnings, are considered when calculating earnings per share on a diluted basis with diluted earnings per share being the more dilutive of the treasury stock or two-class methods. OP Units are included in dilutive earnings per share calculations when the units are dilutive to earnings per share. For the three and nine months ended September 30, 2021 and 2020, MAA’s diluted earnings per share was computed using the treasury stock method as presented below (dollars and shares in thousands, except per share amounts): Three months ended September 30, Nine months ended September 30, 2021 2020 2021 2020 Calculation of Earnings per common share - basic Net income $ 87,047 $ 62,036 $ 359,786 $ 177,716 Net income attributable to noncontrolling interests ( 2,568 ) ( 2,126 ) ( 11,636 ) ( 6,096 ) Unvested restricted stock (allocation of earnings) ( 80 ) ( 78 ) ( 359 ) ( 229 ) Preferred dividends ( 922 ) ( 922 ) ( 2,766 ) ( 2,766 ) Net income available for MAA common shareholders, adjusted $ 83,477 $ 58,910 $ 345,025 $ 168,625 Weighted average common shares - basic 114,933 114,216 114,568 114,177 Earnings per common share - basic $ 0.73 $ 0.52 $ 3.01 $ 1.48 Calculation of Earnings per common share - diluted Net income $ 87,047 $ 62,036 $ 359,786 $ 177,716 Net income attributable to noncontrolling interests (1) ( 2,568 ) ( 2,126 ) ( 11,636 ) ( 6,096 ) Preferred dividends ( 922 ) ( 922 ) ( 2,766 ) ( 2,766 ) Net income available for MAA common shareholders, adjusted $ 83,557 $ 58,988 $ 345,384 $ 168,854 Weighted average common shares - basic 114,933 114,216 114,568 114,177 Effect of dilutive securities 296 252 305 310 Weighted average common shares - diluted 115,229 114,468 114,873 114,487 Earnings per common share - diluted $ 0.73 $ 0.52 $ 3.01 $ 1.47 (1) For the three and nine months ended September 30, 2021 3.5 million OP Units and 3.8 million OP Units, respectively, and their related income are not included in the diluted earnings per share calculations as they are not dilutive. For the three and nine months ended September 30, 2020, 4.1 million OP Units and their related income are not included in the diluted earnings per share calculations as they are not dilutive.

Earnings Per OP Unit of MAALP

Earnings Per OP Unit of MAALP	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings per OP Unit of MAALP	3. Earnings per OP Unit of MAALP Basic earnings per common unit is computed by dividing net income available for common unitholders by the weighted average number of OP Units outstanding during the period. All outstanding unvested restricted unit awards contain rights to non-forfeitable distributions and participate in undistributed earnings with common unitholders and, accordingly, are considered participating securities that are included in the two-class method of computing basic earnings per common unit. Diluted earnings per common unit reflects the potential dilution that could occur if securities or other contracts to issue OP Units were exercised or converted into OP Units. Both the unvested restricted unit awards and other potentially dilutive common units, and the related impact to earnings, are considered when calculating earnings per common unit on a diluted basis with diluted earnings per common unit being the more dilutive of the treasury stock or two-class methods. For the three and nine months ended September 30, 2021 and 2020, MAALP’s diluted earnings per common unit was computed using the treasury stock method as presented below (dollars and units in thousands, except per unit amounts): Three months ended September 30, Nine months ended September 30, 2021 2020 2021 2020 Calculation of Earnings per common unit - basic Net income $ 87,047 $ 62,036 $ 359,786 $ 177,716 Unvested restricted stock (allocation of earnings) ( 80 ) ( 78 ) ( 359 ) ( 229 ) Preferred unit distributions ( 922 ) ( 922 ) ( 2,766 ) ( 2,766 ) Net income available for MAALP common unitholders, adjusted $ 86,045 $ 61,036 $ 356,661 $ 174,721 Weighted average common units - basic 118,430 118,274 118,389 118,238 Earnings per common unit - basic $ 0.73 $ 0.52 $ 3.01 $ 1.48 Calculation of Earnings per common unit - diluted Net income $ 87,047 $ 62,036 $ 359,786 $ 177,716 Preferred unit distributions ( 922 ) ( 922 ) ( 2,766 ) ( 2,766 ) Net income available for MAALP common unitholders, adjusted $ 86,125 $ 61,114 $ 357,020 $ 174,950 Weighted average common units - basic 118,430 118,274 118,389 118,238 Effect of dilutive securities 296 252 305 310 Weighted average common units - diluted 118,726 118,526 118,694 118,548 Earnings per common unit - diluted $ 0.73 $ 0.52 $ 3.01 $ 1.48

MAA Equity

MAA Equity	9 Months Ended
	Sep. 30, 2021
M A A Equity [Abstract]
MAA Equity	4. MAA Equity Changes in MAA’s total equity and its components for the three months ended September 30, 2021 and 2020 were as follows (dollars in thousands): Mid-America Apartment Communities, Inc. Shareholders’ Equity Preferred Common Additional Accumulated Accumulated Noncontrolling Noncontrolling Total EQUITY BALANCE JUNE 30, 2021 $ 9 $ 1,147 $ 7,201,885 $ ( 1,272,694 ) $ ( 11,632 ) $ 185,340 $ 16,612 $ 6,120,667 Net income — — — 84,479 — 2,568 — 87,047 Other comprehensive income - derivative instruments — — — — 248 30 — 278 Issuance and registration of common shares — — ( 103 ) — — — — ( 103 ) Exercise of stock options — — 12 — — — — 12 Shares issued in exchange for common units — 2 11,106 — — ( 11,108 ) — — Redeemable stock fair market value adjustment — — — ( 2,356 ) — — — ( 2,356 ) Adjustment for noncontrolling interests in Operating Partnership — — ( 22 ) — — 22 — — Amortization of unearned compensation — — 4,007 — — — — 4,007 Dividends on preferred stock — — — ( 922 ) — — — ( 922 ) Dividends on common stock ($ 1.025 per share) — — — ( 118,018 ) — — — ( 118,018 ) Dividends on noncontrolling interests units ($ 1.025 per share) — — — — — ( 3,486 ) — ( 3,486 ) Contribution from noncontrolling interest — — — — — — 3,204 3,204 EQUITY BALANCE SEPTEMBER 30, 2021 $ 9 $ 1,149 $ 7,216,885 $ ( 1,309,511 ) $ ( 11,384 ) $ 173,366 $ 19,816 $ 6,090,330 Mid-America Apartment Communities, Inc. Shareholders’ Equity Preferred Common Additional Accumulated Accumulated Noncontrolling Noncontrolling Total EQUITY BALANCE JUNE 30, 2020 $ 9 $ 1,140 $ 7,168,886 $ ( 1,202,536 ) $ ( 12,665 ) $ 209,894 $ 6,849 $ 6,171,577 Net income — — — 59,910 — 2,126 — 62,036 Other comprehensive income - derivative instruments — — — — 269 10 — 279 Issuance and registration of common shares — — 33 — — — — 33 Shares issued in exchange for common units — — 21 — — ( 21 ) — — Redeemable stock fair market value adjustment — — — ( 155 ) — — — ( 155 ) Adjustment for noncontrolling interests in Operating Partnership — — 71 — — ( 71 ) — — Amortization of unearned compensation — — 4,380 — — — — 4,380 Dividends on preferred stock — — — ( 922 ) — — — ( 922 ) Dividends on common stock ($ 1.000 per share) — — — ( 114,369 ) — — — ( 114,369 ) Dividends on noncontrolling interests units ($ 1.000 per share) — — — — — ( 3,866 ) — ( 3,866 ) Contribution from noncontrolling interest — — — — — — 262 262 EQUITY BALANCE SEPTEMBER 30, 2020 $ 9 $ 1,140 $ 7,173,391 $ ( 1,258,072 ) $ ( 12,396 ) $ 208,072 $ 7,111 $ 6,119,255 Changes in MAA’s total equity and its components for the nine months ended September 30, 2021 and 2020 were as follows (dollars in thousands): Mid-America Apartment Communities, Inc. Shareholders’ Equity Preferred Common Additional Accumulated Accumulated Noncontrolling Noncontrolling Total EQUITY BALANCE DECEMBER 31, 2020 $ 9 $ 1,141 $ 7,176,793 $ ( 1,294,182 ) $ ( 12,128 ) $ 206,927 $ 9,848 $ 6,088,408 Net income — — — 348,150 — 11,636 — 359,786 Other comprehensive income - derivative instruments — — — — 744 91 — 835 Issuance and registration of common shares — 2 ( 438 ) — — — — ( 436 ) Shares repurchased and retired — — ( 9,043 ) — — — — ( 9,043 ) Exercise of stock options — — 1,478 — — — — 1,478 Shares issued in exchange for common units — 6 33,266 — — ( 33,272 ) — — Redeemable stock fair market value adjustment — — — ( 7,545 ) — — — ( 7,545 ) Adjustment for noncontrolling interests in Operating Partnership — — 678 — — ( 678 ) — — Amortization of unearned compensation — — 14,151 — — — — 14,151 Dividends on preferred stock — — — ( 2,766 ) — — — ( 2,766 ) Dividends on common stock ($ 3.075 per share) — — — ( 353,168 ) — — — ( 353,168 ) Dividends on noncontrolling interests units ($ 3.075 per share) — — — — — ( 11,338 ) — ( 11,338 ) Contribution from noncontrolling interest — — — — — — 9,968 9,968 EQUITY BALANCE SEPTEMBER 30, 2021 $ 9 $ 1,149 $ 7,216,885 $ ( 1,309,511 ) $ ( 11,384 ) $ 173,366 $ 19,816 $ 6,090,330 Mid-America Apartment Communities, Inc. Shareholders’ Equity Preferred Common Additional Accumulated Accumulated Noncontrolling Noncontrolling Total EQUITY BALANCE DECEMBER 31, 2019 $ 9 $ 1,140 $ 7,166,073 $ ( 1,085,479 ) $ ( 13,178 ) $ 214,647 $ 6,247 $ 6,289,459 Net income — — — 171,620 — 6,096 — 177,716 Other comprehensive income - derivative instruments — — — — 782 28 — 810 Issuance and registration of common shares — — ( 344 ) — — — — ( 344 ) Shares repurchased and retired — — ( 5,657 ) — — — — ( 5,657 ) Exercise of stock options — — 71 — — — — 71 Shares issued in exchange for common units — — 471 — — ( 471 ) — — Redeemable stock fair market value adjustment — — — 1,659 — — — 1,659 Adjustment for noncontrolling interests in Operating Partnership — — 244 — — ( 244 ) — — Amortization of unearned compensation — — 12,533 — — — — 12,533 Dividends on preferred stock — — — ( 2,766 ) — — — ( 2,766 ) Dividends on common stock ($ 3.000 per share) — — — ( 343,106 ) — — — ( 343,106 ) Dividends on noncontrolling interests units ($ 3.000 per share) — — — — — ( 11,984 ) — ( 11,984 ) Contribution from noncontrolling interest — — — — — — 864 864 EQUITY BALANCE SEPTEMBER 30, 2020 $ 9 $ 1,140 $ 7,173,391 $ ( 1,258,072 ) $ ( 12,396 ) $ 208,072 $ 7,111 $ 6,119,255

MAALP Capital

MAALP Capital	9 Months Ended
	Sep. 30, 2021
M A A L P Capital [Abstract]
MAALP Capital	5. MAALP Capital Changes in MAALP’s total capital and its components for the three months ended September 30, 2021 and 2020 were as follows (dollars in thousands): Mid-America Apartments, L.P. Unitholders’ Capital Limited General Preferred Accumulated Noncontrolling Total CAPITAL BALANCE JUNE 30, 2021 $ 185,340 $ 5,863,795 $ 66,840 $ ( 11,939 ) $ 16,612 $ 6,120,648 Net income 2,568 83,557 922 — — 87,047 Other comprehensive income - derivative instruments — — — 278 — 278 Issuance of units — ( 103 ) — — — ( 103 ) Exercise of unit options — 12 — — — 12 General partnership units issued in exchange for limited partnership units ( 11,108 ) 11,108 — — — — Redeemable units fair market value adjustment — ( 2,356 ) — — — ( 2,356 ) Adjustment for limited partners’ capital at redemption value 52 ( 52 ) — — — — Amortization of unearned compensation — 4,007 — — — 4,007 Distributions to preferred unitholders — — ( 922 ) — — ( 922 ) Distributions to common unitholders ($ 1.025 per unit) ( 3,486 ) ( 118,018 ) — — — ( 121,504 ) Contribution from noncontrolling interest — — — — 3,204 3,204 CAPITAL BALANCE SEPTEMBER 30, 2021 $ 173,366 $ 5,841,950 $ 66,840 $ ( 11,661 ) $ 19,816 $ 6,090,311 Mid-America Apartments, L.P. Unitholders’ Capital Limited General Preferred Accumulated Noncontrolling Total CAPITAL BALANCE JUNE 30, 2020 $ 209,894 $ 5,901,028 $ 66,840 $ ( 13,053 ) $ 6,849 $ 6,171,558 Net income 2,126 58,988 922 — — 62,036 Other comprehensive income - derivative instruments — — — 279 — 279 Issuance of units — 33 — — — 33 General partnership units issued in exchange for limited partnership units ( 21 ) 21 — — — — Redeemable units fair market value adjustment — ( 155 ) — — — ( 155 ) Adjustment for limited partners’ capital at redemption value ( 61 ) 61 — — — — Amortization of unearned compensation — 4,380 — — — 4,380 Distributions to preferred unitholders — — ( 922 ) — — ( 922 ) Distributions to common unitholders ($ 1.000 per unit) ( 3,866 ) ( 114,369 ) — — — ( 118,235 ) Contribution from noncontrolling interest — — — — 262 262 CAPITAL BALANCE SEPTEMBER 30, 2020 $ 208,072 $ 5,849,987 $ 66,840 $ ( 12,774 ) $ 7,111 $ 6,119,236 Changes in MAALP’s total capital and its components for the nine months ended September 30, 2021 and 2020 were as follows (dollars in thousands): Mid-America Apartments, L.P. Unitholders’ Capital Limited General Preferred Accumulated Noncontrolling Total CAPITAL BALANCE DECEMBER 31, 2020 $ 206,927 $ 5,817,270 $ 66,840 $ ( 12,496 ) $ 9,848 $ 6,088,389 Net income 11,636 345,384 2,766 — — 359,786 Other comprehensive income - derivative instruments — — — 835 — 835 Issuance of units — ( 436 ) — — — ( 436 ) Units repurchased and retired — ( 9,043 ) — — — ( 9,043 ) Exercise of unit options — 1,478 — — — 1,478 General partnership units issued in exchange for limited partnership units ( 33,272 ) 33,272 — — — — Redeemable units fair market value adjustment — ( 7,545 ) — — — ( 7,545 ) Adjustment for limited partners’ capital at redemption value ( 587 ) 587 — — — — Amortization of unearned compensation — 14,151 — — — 14,151 Distributions to preferred unitholders — — ( 2,766 ) — — ( 2,766 ) Distributions to common unitholders ($ 3.075 per unit) ( 11,338 ) ( 353,168 ) — — — ( 364,506 ) Contribution from noncontrolling interest — — — — 9,968 9,968 CAPITAL BALANCE SEPTEMBER 30, 2021 $ 173,366 $ 5,841,950 $ 66,840 $ ( 11,661 ) $ 19,816 $ 6,090,311 Mid-America Apartments, L.P. Unitholders’ Capital Limited General Preferred Accumulated Noncontrolling Total CAPITAL BALANCE DECEMBER 31, 2019 $ 214,647 $ 6,015,290 $ 66,840 $ ( 13,584 ) $ 6,247 $ 6,289,440 Net income 6,096 168,854 2,766 — — 177,716 Other comprehensive income - derivative instruments — — — 810 — 810 Issuance of units — ( 344 ) — — — ( 344 ) Units repurchased and retired — ( 5,657 ) — — — ( 5,657 ) Exercise of unit options — 71 — — — 71 General partnership units issued in exchange for limited partnership units ( 471 ) 471 — — — — Redeemable units fair market value adjustment — 1,659 — — — 1,659 Adjustment for limited partners’ capital at redemption value ( 216 ) 216 — — — — Amortization of unearned compensation — 12,533 — — — 12,533 Distributions to preferred unitholders — — ( 2,766 ) — — ( 2,766 ) Distributions to common unitholders ($ 3.000 per unit) ( 11,984 ) ( 343,106 ) — — — ( 355,090 ) Contribution from noncontrolling interest — — — — 864 864 CAPITAL BALANCE SEPTEMBER 30, 2020 $ 208,072 $ 5,849,987 $ 66,840 $ ( 12,774 ) $ 7,111 $ 6,119,236

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2021
Notes To Financial Statements [Abstract]
Borrowings	6. Borrowings The following table summarizes the Company’s outstanding debt as of September 30, 2021 (dollars in thousands): Balance Weighted Average Effective Rate Weighted Average Contract Maturity Unsecured debt Variable rate commercial paper program $ 25,000 0.2 % 10/1/2021 Fixed rate senior notes 4,175,000 3.3 % 3/4/2029 Debt issuance costs, discounts, premiums and fair market value adjustments ( 24,744 ) Total unsecured debt $ 4,175,256 3.3 % Secured debt Fixed rate property mortgages $ 368,892 4.4 % 9/17/2048 Debt issuance costs ( 3,261 ) Total secured debt $ 365,631 4.4 % Total outstanding debt $ 4,540,887 3.4 % Unsecured Revolving Credit Facility In May 2019, MAALP entered into a $ 1.0 billion unsecured revolving credit facility with a syndicate of banks led by Wells Fargo Bank, National Association, or Wells Fargo, and fourteen other banks, which is referred to as the Credit Facility. The Credit Facility replaced MAALP’s previous unsecured revolving credit facility, and it includes an expansion option up to $ 1.5 billion . The Credit Facility bears an interest rate of the London Interbank Offered Rate, or LIBOR, plus a spread of 0.75 % to 1.45 % based on an investment grade pricing grid. The Credit Facility matures in May 2023 with an option to extend for two additional six-month periods. As of September 30, 2021 , there was no outstanding balance under the Credit Facility, while $ 3.4 million of capacity was used to support outstanding letters of credit. Unsecured Commercial Paper In May 2019, MAALP established an unsecured commercial paper program whereby MAALP may issue unsecured commercial paper notes with varying maturities not to exceed 397 days up to a maximum aggregate principal amount outstanding of $ 500.0 million . As of September 30, 2021, MAALP had $ 25.0 million outstanding under the commercial paper program. For the three months ended September 30, 2021 , the average daily borrowings outstanding under the commercial paper program were $ 161.5 million. Unsecured Senior Notes As of September 30, 2021, MAALP had $ 4.2 billion of publicly issued unsecured senior notes outstanding. The unsecured senior notes had maturities at issuance ranging from 5 to 30 years, with a weighted average of 7.4 years remaining until maturity as of September 30, 2021. In July 2021, MAALP retired a $ 72.8 million tranche of privately placed unsecured senior notes at maturity. In August 2021, MAALP publicly issued $ 300 million in aggregate principal amount of unsecured senior notes maturing September 2026 with a coupon rate of 1.100 % per annum, or the 2026 Notes. The purchase price paid by the purchasers of the 2026 Notes was 99.553 % of the principal amount. The 2026 Notes are general unsecured senior obligations of MAALP and rank equally in right of payment with all other unsecured senior indebtedness of MAALP. Interest on the 2026 Notes is payable semi-annually in arrears on March 15 and September 15 of each year beginning March 15, 2022. The net proceeds of the offering were $ 296.9 million, after deducting the original issue discount, underwriting commissions and expenses totaling $ 3.1 million. The 2026 Notes have an effective interest rate of 1.191 % and have been reflected net of discount and debt issuance costs in the accompanying Condensed Consolidated Balance Sheets as of September 30, 2021. In August 2021, MAALP also publicly issued $ 300 million in aggregate principal amount of unsecured senior notes maturing September 2051 with a coupon rate of 2.875 % per annum, or the 2051 Notes. The purchase price paid by the purchasers of the 2051 Notes was 98.588 % of the principal amount. The 2051 Notes are general unsecured senior obligations of MAALP and rank equally in right of payment with all other unsecured senior indebtedness of MAALP. Interest on the 2051 Notes is payable semi-annually in arrears on March 15 and September 15 of each year beginning March 15, 2022. The net proceeds of the offering were $ 293.1 million, after deducting the original issue discount, underwriting commissions and expenses totaling $ 6.9 million. The 2051 Notes have an effective interest rate of 2.946 % and have been reflected net of discount and debt issuance costs in the accompanying Condensed Consolidated Balance Sheets as of September 30, 2021. In September 2021, MAALP retired a $ 117.0 million tranche of privately placed unsecured senior notes due in November 2022, a $ 125.0 million portion of the $ 250.0 million in aggregate principal amount of publicly issued unsecured senior notes due in December 2022, a $ 12.3 million tranche of privately placed unsecured senior notes due in July 2023, and a $ 20.0 million tranche of privately placed unsecured senior notes due in November 2024. MAALP incurred $ 13.4 million in prepayment penalties and write-offs of unamortized costs resulting from the debt retirements in the third quarter of 2021. These costs are included in “ Other non-operating (income) expense ” in the accompanying Condensed Consolidated Statements of Operations for the three and nine months ended September 30, 2021 . Secured Property Mortgages As of September 30, 2021, MAALP had $ 368.9 million of fixed rate conventional property mortgages with a weighted average interest rate of 4.4 % and a weighted average maturity in 2048 . In February 2021, MAALP retired a $ 118.6 million mortgage associated with eight apartment communities prior to its June 2021 maturity.

Financial Instruments and Deriv

Financial Instruments and Derivatives	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Financial Instruments and Derivatives	7. Financial Instruments and Derivatives Financial Instruments Not Carried at Fair Value Cash and cash equivalents, restricted cash and accrued expenses and other liabilities are carried at amounts that reasonably approximate their fair value due to their short term nature. Fixed rate notes payable as of September 30, 2021 and December 31, 2020, totaled $ 4.5 billion and $ 4.4 billion , respectively, and had estimated fair values of $ 4.9 billion and $ 4.9 billion (excluding prepayment penalties) as of September 30, 2021 and December 31, 2020, respectively. The fair values of fixed rate debt are determined by using the present value of future cash outflows discounted with the applicable current market rate plus a credit spread. The carrying values of variable rate debt as of September 30, 2021 and December 31, 2020, totaled $ 25.0 million and $ 172.0 million , respectively, and had estimated fair values of $ 25.0 million and $ 172.0 million (excluding prepayment penalties) as of September 30, 2021 and December 31, 2020 , respectively. The fair values of variable rate debt are determined using the stated variable rate plus the current market credit spread. The variable rates reset at various maturities, typically less than 30 days, and management concluded these rates reasonably estimate current market rates. Financial Instruments Measured at Fair Value on a Recurring Basis As of September 30, 2021 , the Company had one outstanding series of cumulative redeemable preferred stock, which is referred to as the MAA Series I preferred stock (see Note 8). The Company has recognized a derivative asset related to the redemption feature embedded in the MAA Series I preferred stock. The derivative asset is valued using widely accepted valuation techniques, including a discounted cash flow analysis in which the perpetual value of the preferred shares is compared to the value of the preferred shares assuming the call option is exercised, with the value of the bifurcated call option as the difference between the two values. The analysis reflects the contractual terms of the redeemable preferred shares, which are redeemable at the Company’s option beginning on October 1, 2026 at the redemption price of $ 50.00 per share. The Company uses various inputs in the analysis, including trading data available on the preferred shares, coupon yields on preferred stock issuances from REITs with similar credit ratings as MAA and treasury rates to determine the fair value of the bifurcated call option. The redemption feature embedded in the MAA Series I preferred stock is reported as a derivative asset in “Other assets” in the accompanying Condensed Consolidated Balance Sheets and is adjusted to its fair value at each reporting date, with a corresponding non-cash adjustment to “Other non-operating (income) expense” in the accompanying Condensed Consolidated Statements of Operations. As a result of adjustments of non-cash expense recorded to reflect the change in fair value of the derivative asset during the nine months ended September 30, 2021, the fair value of the embedded derivative asset increased to $ 50.5 million as of September 30, 2021 as compared to $ 39.0 million as of December 31, 2020. The Company has determined the majority of the inputs used to value its outstanding debt and its embedded derivative fall within Level 2 of the fair value hierarchy, and as a result, the fair value valuation of its debt and embedded derivative held as of September 30, 2021 and December 31, 2020 were classified as Level 2 in the fair value hierarchy. Terminated Cash Flow Hedges of Interest As of September 30, 2021, the Company had $ 11.7 million recorded in “Accumulated other comprehensive loss” related to realized losses associated with terminated interest rate swaps that were designated as cash flow hedging instruments prior to their termination. The realized losses associated with the terminated interest rate swaps are reclassified to interest expense as interest payments are made on the Company’s debt and will continue to be reclassified to interest expense until the debt’s maturity. During the next twelve months, the Company estimates an additional $ 1.1 million will be reclassified to earnings as an increase to “Interest expense”. Tabular Disclosure of the Effect of Derivative Instruments on the Condensed Consolidated Statements of Operations The tables below present the effect of the Company’s derivative financial instruments on the Condensed Consolidated Statements of Operations for the three and nine months ended September 30, 2021 and 2020 (dollars in thousands): Derivatives in Cash Flow Hedging Relationships Location of Loss Reclassified Net Loss Reclassified from Accumulated OCL into Interest Expense (1) Three months ended September 30, from Accumulated OCL into Income 2021 2020 Terminated interest rate swaps Interest expense $ ( 278 ) $ ( 279 ) Nine months ended September 30, Terminated interest rate swaps Interest expense $ ( 835 ) $ ( 810 ) (1) See the Condensed Consolidated Statements of Comprehensive Income for changes in accumulated other comprehensive loss as these changes are presented net of the allocation to noncontrolling interests. Derivative Not Designated as Hedging Instrument Location of Gain (Loss) Recognized Gain (Loss) Recognized in Earnings on Derivative Three months ended September 30, in Income on Derivative 2021 2020 Preferred stock embedded derivative Other non-operating (income) expense $ 13,432 $ 1,342 Nine months ended September 30, Preferred stock embedded derivative Other non-operating (income) expense $ 11,492 $ ( 14,603 )

Shareholders' Equity of MAA

Shareholders' Equity of MAA	9 Months Ended
	Sep. 30, 2021
Shareholders Equity Of M A A [Abstract]
Shareholders' Equity of MAA	8. Shareholders’ Equity of MAA As of September 30, 2021, 115,138,323 shares of common stock of MAA and 3,402,682 OP Units (excluding the OP Units held by MAA) were issued and outstanding, representing a total of 118,541,005 common shares and units. As of September 30, 2020, 114,369,812 shares of common stock of MAA and 4,058,258 OP Units (excluding the OP Units held by MAA) were issued and outstanding, representing a total of 118,428,070 common shares and units. Options to purchase 813 shares of MAA’s common stock were outstanding as of September 30, 2021, compared to 19,845 outstanding options as of September 30, 2020. During the nine months ended September 30, 2021 and 2020, MAA issued 19,032 common shares and 918 common shares, respectively, related to the exercise of stock options. These exercises resulted in net proceeds of $ 1.5 million and $ 0.1 million , respectively. Preferred Stock As of September 30, 2021, MAA had one outstanding series of cumulative redeemable preferred stock, which has the following characteristics: Description Outstanding Shares Liquidation Preference (1) Optional Redemption Date Redemption Price (2) Stated Dividend Yield Approximate Dividend Rate Series I 867,846 $ 50.00 10/1/2026 $ 50.00 8.50 % $ 4.25 (1) The total liquidation preference for the outstanding preferred stock is $ 43.4 million . (2) The redemption price is the price at which the preferred stock is redeemable, at MAA’s option, for cash. See Note 7 for details of the valuation of the derivative asset related to the redemption feature embedded in the MAA Series I preferred stock. Equity Forward Sale Agreements In August 2021, MAA entered into two 18-month forward sale agreements with respect to a total of 1.1 million shares of its common stock at an initial forward sale price of $ 190.56 per share. Under the forward sale agreements, the forward sale price is subject to adjustment on a daily basis based on a floating interest rate factor equal to a specified daily rate less a spread and will be decreased based on amounts related to dividends on MAA’s common stock during the term of the forward sale agreements. No shares had been settled under the forward sale agreements as of September 30, 2021. MAA generally has the ability to determine the dates and method of settlement (i.e., gross physical settlement, net share settlement or cash settlement), subject to certain conditions and the right of the counterparty to accelerate settlement under certain circumstances, provided that settlement under each forward sale agreement must occur by February 2, 2023. MAA currently expects to fully physically settle each forward sale agreement with the relevant forward purchaser on one or more dates specified by MAA on or prior to the maturity date of the particular forward sale agreement, in which case MAA expects to receive aggregate net cash proceeds at settlement equal to the number of shares underlying the particular forward sale agreement multiplied by the relevant forward sale price. The Company accounts for the shares of MAA’s common stock reserved for issuance upon settlement as equity in accordance with ASC 815-40, Contracts in Entity’s Own Equity , which permits equity classification when a contract is considered indexed to its own stock and the contract requires or permits the issuing entity to settle the contract in shares (either physically or net in shares). The guidance in ASC Topic 815-40 establishes a two-step process for evaluating whether an equity-linked financial instrument is considered indexed to its own stock by evaluating the instrument’s contingent exercise provisions and the instrument’s settlement provisions. When entering into the forward sale agreements, the Company determined that (i) none of the agreements’ exercise contingencies are based on observable markets or indices besides those related to the market of MAA’s common stock price; and (ii) none of the settlement provisions preclude the agreements from being indexed to MAA’s common stock. Before the issuance of shares of MAA’s common stock, upon physical or net share settlement of the forward sale agreements, the Company expects that the shares issuable upon settlement of the forward sale agreements will be reflected in its diluted earnings per share calculations using the treasury stock method. Under this method, the number of shares of common stock used in calculating diluted earnings per share is deemed to be increased by the excess, if any, of the number of shares of common stock that would be issued upon full physical settlement of the forward sale agreements over the number of shares of common stock that could be purchased by MAA in the open market (based on the average market price during the period) using the proceeds to be received upon full physical settlement (based on the adjusted forward sale price at the end of the reporting period). When MAA physically or net share settles a forward sale agreement, the delivery of shares of common stock would result in an increase in the number of weighted average common shares outstanding and dilution to basic earnings per share. The impact of the forward sale agreements was no t dilutive to the Company’s diluted earnings per share for the three and nine months ended September 30, 2021 .

Partners' Capital of MAALP

Partners' Capital of MAALP	9 Months Ended
	Sep. 30, 2021
Partners Capital Notes [Abstract]
Partners' Capital of MAALP	9. Partners’ Capital of MAALP Common units of limited partnership interests in MAALP are represented by OP Units. As of September 30, 2021, there were 118,541,005 OP Units outstanding, 115,138,323 , or 97.1 % , of which represent Class B OP Units (common units issued to or held by MAALP’s general partner or any of its subsidiaries), which were owned by MAA, MAALP’s general partner. The remaining 3,402,682 OP Units were Class A OP Units owned by Class A limited partners. As of September 30, 2020, there were 118,428,070 OP Units outstanding, 114,369,812 , or 96.6 % , of which were owned by MAA and 4,058,258 of which were owned by the Class A limited partners. MAA, as the sole general partner of MAALP, has full, complete and exclusive discretion to manage and control the business of MAALP subject to the restrictions specifically contained within MAALP’s agreement of limited partnership, or the Partnership Agreement. Unless otherwise stated in the Partnership Agreement, this power includes, but is not limited to, acquiring, leasing or disposing of any real property; constructing buildings and making other improvements to properties owned; borrowing money, modifying or extinguishing current borrowings, issuing evidence of indebtedness and securing such indebtedness by mortgage, deed of trust, pledge or other lien on MAALP’s assets; and distribution of MAALP’s cash or other assets in accordance with the Partnership Agreement. MAA can generally, at its sole discretion, issue and redeem OP Units and determine the consideration to be received or the redemption price to be paid, as applicable. The general partner may delegate these and other powers granted to it if the general partner remains in supervision of the designee. Under the Partnership Agreement, MAALP may issue Class A OP Units and Class B OP Units. Class A OP Units are any OP Units other than Class B OP Units, while Class B OP Units are those issued to or held by MAALP’s general partner or any of its subsidiaries. In general, the limited partners do not have the power to participate in the management or control of MAALP’s business except in limited circumstances, including changes in the general partner and protective rights if the general partner acts outside of the provisions provided in the Partnership Agreement. The transferability of Class A OP Units is also limited by the Partnership Agreement. Net income of MAALP (after allocations to preferred ownership interests) is allocated to the general partner and limited partners based on their respective ownership percentages of MAALP. Issuance or redemption of additional Class A OP Units or Class B OP Units changes the relative ownership percentage of the partners. The issuance of Class B OP Units generally occurs when MAA issues common stock and the proceeds from that issuance are contributed to MAALP in exchange for the issuance to MAA of a number of OP Units equal to the number of shares of common stock issued. Likewise, if MAA repurchases or redeems outstanding shares of common stock, MAALP generally redeems an equal number of Class B OP Units with similar terms held by MAA for a redemption price equal to the purchase price of those shares of common stock. At each reporting period, the allocation between general partner capital and limited partner capital is adjusted to account for the change in the respective percentage ownership of the underlying capital of MAALP. Holders of the Class A OP Units may require MAA to redeem their Class A OP Units, in which case MAA may, at its option, pay the redemption price either in cash (in an amount per Class A OP Unit equal, in general, to the average closing price of MAA’s common stock on the NYSE over a specified period prior to the redemption date) or by delivering one share of MAA common stock (subject to adjustment under specified circumstances) for each Class A OP Unit so redeemed. As of September 30, 2021, a total of 3,402,682 Class A OP Units were outstanding and redeemable for 3,402,682 shares of MAA common stock, with an approximate value of $ 635.5 million , based on the closing price of MAA’s common stock on September 30, 2021 of $ 186.75 per share. As of September 30, 2020, a total of 4,058,258 Class A OP Units were outstanding and redeemable for 4,058,258 shares of MAA common stock, with an approximate value of $ 470.6 million , based on the closing price of MAA’s common stock on September 30, 2020 of $ 115.95 per share. MAALP pays the same per unit distributions in respect to the OP Units as the per share dividends MAA pays in respect to its common stock. As of September 30, 2021, MAALP had one outstanding series of cumulative redeemable preferred units, or the MAALP Series I preferred units. The MAALP Series I preferred units have the same characteristics as the MAA Series I preferred stock described in Note 8. As of September 30, 2021, 867,846 units of the MAALP Series I preferred units were outstanding. See Note 7 for details of the valuation of the derivative asset related to the redemption feature embedded in the MAALP Series I preferred units.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2021
Loss Contingency [Abstract]
Commitments and Contingencies	10. Commitments and Contingencies Leases The Company’s leases include a ground lease expiring in 2074 related to one of its apartment communities and an office lease expiring in 2028 related to its corporate headquarters. Both leases contain stated rent increases that generally compensate for the impact of inflation. The Company also has other commitments related to immaterial office and equipment operating leases. The table below reconciles undiscounted cash flows for each of the first five years and total of the remaining years to the operating lease obligations recorded on the Condensed Consolidated Balance Sheets as of September 30, 2021 (in thousands): Operating Leases 2021 $ 717 2022 2,894 2023 2,885 2024 2,862 2025 2,872 Thereafter 62,913 Total minimum lease payments 75,143 Net present value adjustments ( 44,425 ) Operating lease obligations $ 30,718 Legal Proceedings In June 2016, plaintiffs Cathi Cleven and Tara Cleven, on behalf of a purported class of plaintiffs, filed a complaint against MAA and the Operating Partnership in the United States District Court for the Western District of Texas, Austin Division. In January 2017, Areli Arellano and Joe L. Martinez joined the lawsuit as additional plaintiffs. The lawsuit alleges that the Company (but not Post Properties (see the description of the Brown class action lawsuit below)) charged late fees at its Texas properties that violate Section 92.019 of the Texas Property Code, or Section 92.019, which provides that a landlord may not charge a tenant a late fee for failing to pay rent unless, among other things, the fee is a reasonable estimate of uncertain damages to the landlord that are incapable of precise calculation and result from the late payment of rent. The plaintiffs are seeking monetary damages and attorneys’ fees and costs. In September 2018, the District Court certified a class proposed by the plaintiffs. Additionally, in September 2018, the District Court denied the Company’s motion for summary judgment and granted the plaintiffs’ motion for partial summary judgment. Because the District Court certified a class prior to granting the plaintiffs’ motion for partial summary judgment, the District Court’s ruling applies to the entire class. In October 2018, the Fifth Circuit Court of Appeals accepted the Company’s petition to review the District Court’s order granting class certification. In September 2019, the Fifth Circuit Court of Appeals heard the Company’s oral arguments. The Company also intends to appeal the District Court’s order granting plaintiff’s motion for summary judgment to the Fifth Circuit Court of Appeals if permission to appeal is granted. The Company will continue to vigorously defend the action and pursue such appeals. Management estimates that the Company’s maximum exposure in the lawsuit, given the class certification and summary judgment ruling, is $ 54.6 million , which includes both potential damages and attorneys’ fees but excludes any prejudgment interest that may be awarded. In April 2017, plaintiff Nathaniel Brown, on behalf of a purported class of plaintiffs, filed a complaint against the Operating Partnership, as the successor by merger to Post Properties’ primary operating partnership, and MAA in the United States District Court for the Western District of Texas, Austin Division. The lawsuit alleges that Post Properties (and, following the Post Properties merger in December 2016, the Operating Partnership) charged late fees at its Texas properties that violate Section 92.019. The plaintiffs are seeking monetary damages and attorney’s fees and costs. In September 2018, the District Court certified a class proposed by the plaintiff. Additionally, in September 2018, the District Court denied the Company’s motion for summary judgment and granted the plaintiff’s motion for partial summary judgment. Because the District Court certified a class prior to granting the plaintiff’s motion for partial summary judgment, the District Court’s ruling applies to the entire class. In October 2018, the Fifth Circuit Court of Appeals accepted the Company’s petition to review the District Court’s order granting class certification. In September 2019, the Fifth Circuit Court of Appeals heard the Company’s oral arguments. The Company also intends to appeal the District Court’s order granting plaintiff’s motion for summary judgment to the Fifth Circuit Court of Appeals if permission to appeal is granted. The Company will continue to vigorously defend the action and pursue such appeals. Management estimates that the Company’s maximum exposure in the lawsuit, given the class certification and summary judgment ruling, is $ 8.4 million , which includes both potential damages and attorneys’ fees but excludes any prejudgment interest that may be awarded. The Company is subject to various other legal proceedings and claims that arise in the ordinary course of its business operations. Matters which arise out of allegations of bodily injury, property damage and employment practices are generally covered by insurance. While the resolution of these other matters cannot be predicted with certainty, management does not currently believe that such matters, either individually or in the aggregate, will have a material adverse effect on the Company’s financial condition, results of operations or cash flows in the event of a negative outcome. Loss Contingencies The outcomes of claims, disputes and legal proceedings are subject to significant uncertainty. The Company records an accrual for loss contingencies when a loss is probable and the amount of the loss can be reasonably estimated. The Company also accrues an estimate of defense costs expected to be incurred in connection with legal matters. Management reviews these accruals quarterly and makes revisions based on changes in facts and circumstances. When a loss contingency is not both probable and reasonably estimable, management does not accrue the loss. However, if the loss (or an additional loss in excess of the accrual) is at least a reasonable possibility and material, then management discloses a reasonable estimate of the possible loss, or range of loss, if such reasonable estimate can be made. If the Company cannot make a reasonable estimate of the possible loss, or range of loss, then a statement to that effect is disclosed. The assessment of whether a loss is probable or a reasonable possibility, and whether the loss or range of loss is reasonably estimable, often involves a series of complex judgments about future events. Among the factors considered in this assessment, are the nature of existing legal proceedings and claims, the asserted or possible damages or loss contingency (if reasonably estimable), the progress of the matter, existing law and precedent, the opinions or views of legal counsel and other advisers, management’s experience in similar matters, the facts available to management at the time of assessment, and how the Company intends to respond, or has responded, to the proceeding or claim. Management’s assessment of these factors may change over time as individual proceedings or claims progress. For matters where management is not currently able to reasonably estimate a range of reasonably possible loss, the factors that have contributed to this determination include the following: (i) the damages sought are indeterminate; (ii) the proceedings are in the early stages; (iii) the matters involve novel or unsettled legal theories or a large or uncertain number of actual or potential cases or parties; and/or (iv) discussions with the parties in matters that are ultimately expected to be resolved through negotiation and settlement have not reached the point where management believes a reasonable estimate of loss, or range of loss, can be made. The Company believes that there is considerable uncertainty regarding the timing or ultimate resolution of such matters, including a possible eventual loss or business impact, if any. As of September 30, 2021 and December 31, 2020, the Company’s accrual for loss contingencies relating to unresolved legal matters was $ 5.2 million and $ 5.3 million in the aggregate, respectively. The loss contingencies are presented in “Accrued expenses and other liabilities” in the accompanying Condensed Consolidated Balance Sheets.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2021
Notes To Financial Statements [Abstract]
Segment Information	11. Segment Information As of September 30, 2021, the Company owned and operated 296 multifamily apartment communities (which does not include development communities under construction) in 15 different states from which it derived all significant sources of earnings and operating cash flows. The Company views each consolidated apartment community as an operating segment. The Company’s chief operating decision maker, which is the Company’s Chief Executive Officer, evaluates performance and determines resource allocations of each of the apartment communities on a Same Store and Non-Same Store and Other basis, as well as an individual apartment community basis. This is consistent with the aggregation criteria under GAAP as each of the apartment communities generally has similar economic characteristics, facilities, services, and tenants. The following reflects the two reportable segments for the Company:  Same Store includes communities that the Company has owned and have been stabilized for at least a full 12 month s.  Non-Same Store and Other includes recently acquired communities, communities in development or lease-up, communities that have been identified for disposition, communities that have incurred a significant casualty loss and stabilized communities that do not meet the requirements to be Same Store communities. Also included in Non-Same Store and Other are non-multifamily activities. On the first day of each calendar year, the Company determines the composition of its Same Store and Non-Same Store and Other reportable segments for that year as well as adjusts the previous year, which allows the Company to evaluate full period-over-period operating comparisons. Communities previously in development or lease-up are added to the Same Store segment on the first day of the calendar year after the community has been owned and stabilized for at least a full 12 month s. Communities are considered stabilized after achieving 90 % average physical occupancy for 90 days . Communities that have been identified for disposition are excluded from the Same Store segment. The chief operating decision maker utilizes net operating income, or NOI, in evaluating the performance of its operating segments. Total NOI represents total property revenues less total property operating expenses, excluding depreciation and amortization, for all properties held during the period regardless of their status as held for sale. Management believes that NOI is a helpful tool in evaluating the operating performance of the segments because it measures the core operations of property performance by excluding corporate level expenses and other items not directly related to property operating performance. Revenues and NOI for each reportable segment for the three and nine months ended September 30, 2021 and 2020 were as follows (in thousands): Three months ended September 30, Nine months ended September 30, 2021 2020 2021 2020 Revenues: Same Store Rental revenues $ 431,030 $ 403,574 $ 1,249,053 $ 1,197,610 Other property revenues 2,966 3,103 9,302 9,159 Total Same Store revenues 433,996 406,677 1,258,355 1,206,769 Non-Same Store and Other Rental revenues 18,449 16,447 55,372 47,438 Other property revenues 130 75 780 116 Total Non-Same Store and Other revenues 18,579 16,522 56,152 47,554 Total rental and other property revenues $ 452,575 $ 423,199 $ 1,314,507 $ 1,254,323 Net Operating Income: Same Store NOI $ 269,393 $ 244,513 $ 779,194 $ 747,581 Non-Same Store and Other NOI 10,344 8,872 31,246 26,285 Total NOI 279,737 253,385 810,440 773,866 Depreciation and amortization ( 134,611 ) ( 127,679 ) ( 397,938 ) ( 381,257 ) Property management expenses ( 13,831 ) ( 12,691 ) ( 40,522 ) ( 39,064 ) General and administrative expenses ( 12,670 ) ( 11,360 ) ( 38,763 ) ( 35,181 ) Interest expense ( 39,234 ) ( 41,010 ) ( 117,773 ) ( 126,610 ) (Loss) gain on sale of depreciable real estate assets ( 313 ) 20 134,515 ( 7 ) Gain on sale of non-depreciable real estate assets 170 1,366 202 995 Other non-operating income (expense) 10,344 242 14,557 ( 13,647 ) Income tax expense ( 2,803 ) ( 665 ) ( 5,847 ) ( 2,532 ) Income from real estate joint venture 258 428 915 1,153 Net income attributable to noncontrolling interests ( 2,568 ) ( 2,126 ) ( 11,636 ) ( 6,096 ) Dividends to MAA Series I preferred shareholders ( 922 ) ( 922 ) ( 2,766 ) ( 2,766 ) Net income available for MAA common shareholders $ 83,557 $ 58,988 $ 345,384 $ 168,854 Assets for each reportable segment as of September 30, 2021 and December 31, 2020 were as follows (in thousands): September 30, 2021 December 31, 2020 Assets: Same Store $ 9,910,526 $ 10,076,511 Non-Same Store and Other 1,140,873 937,375 Corporate assets 202,733 180,905 Total assets $ 11,254,132 $ 11,194,791

Real Estate Acquisitions and Di

Real Estate Acquisitions and Dispositions	9 Months Ended
	Sep. 30, 2021
Real Estate [Abstract]
Real Estate Acquisitions and Dispositions	12. Real Estate Acquisitions and Dispositions The following table reflects the Company ’s acquisition activity for the nine months ended September 30, 2021: Multifamily Development Acquisitions (1) Market Units (2) Date Acquired Novel Daybreak Salt Lake City, UT 400 April 2021 Novel West Midtown Atlanta, GA 340 April 2021 (1) These pre-purchase multifamily community developments are being developed through joint ventures with a local developer. The Company owns 80 % of each joint venture that owns these properties. (2) Represents number of units upon completion of the development. Land Acquisition Market Acres Date Acquired MAA Westshore Tampa, FL 19 June 2021 The following table reflects the Company’s disposition activity for the nine months ended September 30, 2021: Multifamily Disposition Market Units Date Sold Crosswinds Jackson, MS 360 June 2021 Pear Orchard Jackson, MS 389 June 2021 Reflection Pointe Jackson, MS 296 June 2021 Lakeshore Landing Jackson, MS 196 June 2021 Land Disposition Market Acres Date Sold Colonial Promenade Huntsville, AL 1 September 2021 Tutwiler Birmingham, AL 9 September 2021

Basis of Presentation and Pri_2

Basis of Presentation and Principles of Consolidation and Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying condensed consolidated financial statements have been prepared by the Company’s management in accordance with United States generally accepted accounting principles, or GAAP, and applicable rules and regulations of the Securities and Exchange Commission, or the SEC. The condensed consolidated financial statements of MAA presented herein include the accounts of MAA, the Operating Partnership and all other subsidiaries in which MAA has a controlling financial interest. MAA owns, directly or indirectly, approximately 80 % to 100 % of all consolidated subsidiaries, including the Operating Partnership. The condensed consolidated financial statements of MAALP presented herein include the accounts of MAALP and all other subsidiaries in which MAALP has a controlling financial interest. MAALP owns, directly or indirectly, 80 % to 100 % of all consolidated subsidiaries. In management’s opinion, all adjustments necessary for a fair presentation of the condensed consolidated financial statements have been included, and all such adjustments were of a normal recurring nature. All significant intercompany accounts and transactions have been eliminated in consolidation. The Company invests in entities which may qualify as variable interest entities, or VIEs, and MAALP is considered a VIE. A VIE is a legal entity in which the equity investors lack sufficient equity at risk for the entity to finance its activities without additional subordinated financial support or, as a group, the holders of the equity investment at risk lack the power to direct the activities of a legal entity as well as the obligation to absorb its expected losses or the right to receive its expected residual returns. MAALP is classified as a VIE because the limited partners lack substantive kick-out rights and substantive participating rights. The Company consolidates all VIEs for which it is the primary beneficiary and uses the equity method to account for investments that qualify as VIEs but for which it is not the primary beneficiary. In determining whether the Company is the primary beneficiary of a VIE, management considers both qualitative and quantitative factors, including, but not limited to, those activities that most significantly impact the VIE’s economic performance and which party controls such activities. The Company uses the equity method of accounting for its investments in entities for which the Company exercises significant influence, but does not have the ability to exercise control. The factors considered in determining whether the Company has the ability to exercise control include ownership of voting interests and participatory rights of investors (see “Investments in Unconsolidated Affiliates” below).
Noncontrolling Interests	Noncontrolling Interests As of September 30, 2021, the Company had two types of noncontrolling interests with respect to its consolidated subsidiaries: (1) noncontrolling interests related to the common unitholders of its Operating Partnership; and (2) noncontrolling interests related to its consolidated real estate entities. The noncontrolling interests relating to the limited partnership interests in the Operating Partnership are owned by the holders of the Class A OP Units. MAA is the sole general partner of the Operating Partnership and holds all of the outstanding Class B OP Units. Net income (after allocations to preferred ownership interests) is allocated to MAA and the noncontrolling interests based on their respective ownership percentages of the Operating Partnership. Issuance of additional Class A OP Units or Class B OP Units changes the ownership percentage of both the noncontrolling interests and MAA. The issuance of Class B OP Units generally occurs when MAA issues common stock and the issuance proceeds are contributed to the Operating Partnership in exchange for Class B OP Units equal to the number of shares of MAA’s common stock issued. At each reporting period, the allocation between total MAA shareholders’ equity and noncontrolling interests is adjusted to account for the change in the respective percentage ownership of the underlying equity of the Operating Partnership. MAA’s Board of Directors established economic rights in respect to each Class A OP Unit that were equivalent to the economic rights in respect to each share of MAA common stock. See Note 9 for additional details. The noncontrolling interests relating to the Company’s five consolidated real estate entities are owned by private real estate companies that are generally responsible for the development and construction of the apartment communities that are owned through the consolidated real estate entities with a noncontrolling interest. The entities were determined to be VIE’s with the Company designated as the primary beneficiary. As a result, the accounts of the entities are consolidated by the Company. As of September 30, 2021, the consolidated assets and liabilities of the Company’s consolidated real estate entities with a noncontrolling interest were $ 218.8 million and $ 15.3 million , respectively. As of December 31, 2020, the consolidated assets and liabilities of the Company’s consolidated real estate entities with a noncontrolling interest were $ 128.9 million and $ 8.1 million , respectively.
Investments in Unconsolidated Affiliates	Investments in Unconsolidated Affiliates The Company uses the equity method to account for its investments in a real estate joint venture and two technology-focused limited partnerships that each qualify as a VIE. Management determined the Company is not the primary beneficiary in any of these investments but does have the ability to exert significant influence over the operations and financial policies of the real estate joint venture and considers its investments in the limited partnerships to be more than minor. The Company’s investment in the real estate joint venture was $ 42.8 million and $ 43.3 million as of September 30, 2021 and December 31, 2020, respectively. As of September 30, 2021 and December 31, 2020, the Company’s investments in the technology-focused limited partnerships were $ 43.0 million and $ 23.0 million , respectively, and are included in “Other assets” in the accompanying Condensed Consolidated Balance Sheets. As of September 30, 2021, the Company was committed until February 2025 to make additional capital contributions totaling $ 18.7 million if and when called by the general partners of the limited partnerships.
Fair value Measurements	Fair Value Measurements The Company applies the guidance in Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures , to the valuation of real estate assets recorded at fair value, to its impairment valuation analysis of real estate assets, to its disclosure of the fair value of financial instruments, principally indebtedness and to its derivative financial instruments. Fair value disclosures required under ASC Topic 820 as well as the Company’s derivative accounting policies are summarized in Note 7 utilizing the following hierarchy: Level 1 - Quoted prices in active markets for identical assets or liabilities that are accessible at the measurement date. Level 2 - Inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly. Level 3 - Unobservable inputs for the assets or liability.
Revenue Recognition	Revenue Recognition The Company primarily leases multifamily residential apartments to residents under operating leases generally due on a monthly basis with terms of approximately one year or less. Rental revenues are recognized in accordance with ASC Topic 842, Leases , using a method that represents a straight-line basis over the term of the lease. In addition, in circumstances where a lease incentive is provided to tenants, the incentive is recognized as a reduction of rental revenues on a straight-line basis over the reasonably assured lease term. Rental revenues represent approximately 93% of the Company’s total revenues and include gross rents charged less adjustments for concessions and bad debt. Approximately 6% of the Company’s total revenues represent non-lease reimbursable property revenues from its residents for utility reimbursements, which are generally recognized and due on a monthly basis as residents obtain control of the service over the term of the lease. The remaining 1% of the Company’s total revenues represents other non-lease property revenues primarily driven by nonrefundable fees and commissions. In accordance with ASC Topic 842, rental revenues and non-lease reimbursable property revenues meet the criteria to be aggregated into a single lease component and are reported on a combined basis in the line item “Rental revenues”, as presented in the disaggregation of the Company’s revenues in Note 11. Other non-lease property revenues are accounted for in accordance with ASC Topic 606, Revenue from Contracts with Customers , which requires revenue recognized outside of the scope of ASC Topic 842 to be recognized when a customer obtains control of promised goods or services in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. Other non-lease property revenues are reported in the line item “Other property revenues”, as presented in the disaggregation of the Company’s revenues in Note 11.
Leases	Leases The Company is the lessee under certain ground, office, equipment and other operational leases, all of which are accounted for as operating leases in accordance with ASC Topic 842. The Company recognizes a right-of-use asset for the right to use the underlying asset for all leases where the Company is the lessee with terms of more than twelve months, and a related lease liability for the obligation to make lease payments. Expenses related to leases determined to be operating leases are recognized on a straight-line basis. As of September 30, 2021 and December 31, 2020, right-of-use assets recorded within “Other assets” totaled $ 47.7 million and $ 49.4 million , respectively, and related lease obligations recorded within “Accrued expenses and other liabilities” totaled $ 30.7 million and $ 31.7 million , respectively, in the Condensed Consolidated Balance Sheets. As of September 30, 2021, the Company’s operating leases had a weighted average remaining lease term of approximately 32 years and a weighted average discount rate of approximately 4.4 % . Lease expense recognized for the three and nine months ended September 30, 2021 and 2020 was immaterial to the Company. Cash paid for amounts included in the measurement of operating lease liabilities during the nine months ended September 30, 2021 and 2020 was also immaterial.

Earnings Per Common Share of _2

Earnings Per Common Share of MAA (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Common Share Of M A A [Abstract]
Schedule of Computation of Diluted Earnings per Share	For the three and nine months ended September 30, 2021 and 2020, MAA’s diluted earnings per share was computed using the treasury stock method as presented below (dollars and shares in thousands, except per share amounts): Three months ended September 30, Nine months ended September 30, 2021 2020 2021 2020 Calculation of Earnings per common share - basic Net income $ 87,047 $ 62,036 $ 359,786 $ 177,716 Net income attributable to noncontrolling interests ( 2,568 ) ( 2,126 ) ( 11,636 ) ( 6,096 ) Unvested restricted stock (allocation of earnings) ( 80 ) ( 78 ) ( 359 ) ( 229 ) Preferred dividends ( 922 ) ( 922 ) ( 2,766 ) ( 2,766 ) Net income available for MAA common shareholders, adjusted $ 83,477 $ 58,910 $ 345,025 $ 168,625 Weighted average common shares - basic 114,933 114,216 114,568 114,177 Earnings per common share - basic $ 0.73 $ 0.52 $ 3.01 $ 1.48 Calculation of Earnings per common share - diluted Net income $ 87,047 $ 62,036 $ 359,786 $ 177,716 Net income attributable to noncontrolling interests (1) ( 2,568 ) ( 2,126 ) ( 11,636 ) ( 6,096 ) Preferred dividends ( 922 ) ( 922 ) ( 2,766 ) ( 2,766 ) Net income available for MAA common shareholders, adjusted $ 83,557 $ 58,988 $ 345,384 $ 168,854 Weighted average common shares - basic 114,933 114,216 114,568 114,177 Effect of dilutive securities 296 252 305 310 Weighted average common shares - diluted 115,229 114,468 114,873 114,487 Earnings per common share - diluted $ 0.73 $ 0.52 $ 3.01 $ 1.47 (1) For the three and nine months ended September 30, 2021 3.5 million OP Units and 3.8 million OP Units, respectively, and their related income are not included in the diluted earnings per share calculations as they are not dilutive. For the three and nine months ended September 30, 2020, 4.1 million OP Units and their related income are not included in the diluted earnings per share calculations as they are not dilutive.

Earnings Per OP Unit of MAALP (

Earnings Per OP Unit of MAALP (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Schedule of Diluted Earnings per Common Unit	For the three and nine months ended September 30, 2021 and 2020, MAALP’s diluted earnings per common unit was computed using the treasury stock method as presented below (dollars and units in thousands, except per unit amounts): Three months ended September 30, Nine months ended September 30, 2021 2020 2021 2020 Calculation of Earnings per common unit - basic Net income $ 87,047 $ 62,036 $ 359,786 $ 177,716 Unvested restricted stock (allocation of earnings) ( 80 ) ( 78 ) ( 359 ) ( 229 ) Preferred unit distributions ( 922 ) ( 922 ) ( 2,766 ) ( 2,766 ) Net income available for MAALP common unitholders, adjusted $ 86,045 $ 61,036 $ 356,661 $ 174,721 Weighted average common units - basic 118,430 118,274 118,389 118,238 Earnings per common unit - basic $ 0.73 $ 0.52 $ 3.01 $ 1.48 Calculation of Earnings per common unit - diluted Net income $ 87,047 $ 62,036 $ 359,786 $ 177,716 Preferred unit distributions ( 922 ) ( 922 ) ( 2,766 ) ( 2,766 ) Net income available for MAALP common unitholders, adjusted $ 86,125 $ 61,114 $ 357,020 $ 174,950 Weighted average common units - basic 118,430 118,274 118,389 118,238 Effect of dilutive securities 296 252 305 310 Weighted average common units - diluted 118,726 118,526 118,694 118,548 Earnings per common unit - diluted $ 0.73 $ 0.52 $ 3.01 $ 1.48

MAA Equity (Tables)

MAA Equity (Tables)	9 Months Ended
	Sep. 30, 2021
M A A Equity [Abstract]
Summary of Changes in Total Equity and its Components	Changes in MAA’s total equity and its components for the three months ended September 30, 2021 and 2020 were as follows (dollars in thousands): Mid-America Apartment Communities, Inc. Shareholders’ Equity Preferred Common Additional Accumulated Accumulated Noncontrolling Noncontrolling Total EQUITY BALANCE JUNE 30, 2021 $ 9 $ 1,147 $ 7,201,885 $ ( 1,272,694 ) $ ( 11,632 ) $ 185,340 $ 16,612 $ 6,120,667 Net income — — — 84,479 — 2,568 — 87,047 Other comprehensive income - derivative instruments — — — — 248 30 — 278 Issuance and registration of common shares — — ( 103 ) — — — — ( 103 ) Exercise of stock options — — 12 — — — — 12 Shares issued in exchange for common units — 2 11,106 — — ( 11,108 ) — — Redeemable stock fair market value adjustment — — — ( 2,356 ) — — — ( 2,356 ) Adjustment for noncontrolling interests in Operating Partnership — — ( 22 ) — — 22 — — Amortization of unearned compensation — — 4,007 — — — — 4,007 Dividends on preferred stock — — — ( 922 ) — — — ( 922 ) Dividends on common stock ($ 1.025 per share) — — — ( 118,018 ) — — — ( 118,018 ) Dividends on noncontrolling interests units ($ 1.025 per share) — — — — — ( 3,486 ) — ( 3,486 ) Contribution from noncontrolling interest — — — — — — 3,204 3,204 EQUITY BALANCE SEPTEMBER 30, 2021 $ 9 $ 1,149 $ 7,216,885 $ ( 1,309,511 ) $ ( 11,384 ) $ 173,366 $ 19,816 $ 6,090,330 Mid-America Apartment Communities, Inc. Shareholders’ Equity Preferred Common Additional Accumulated Accumulated Noncontrolling Noncontrolling Total EQUITY BALANCE JUNE 30, 2020 $ 9 $ 1,140 $ 7,168,886 $ ( 1,202,536 ) $ ( 12,665 ) $ 209,894 $ 6,849 $ 6,171,577 Net income — — — 59,910 — 2,126 — 62,036 Other comprehensive income - derivative instruments — — — — 269 10 — 279 Issuance and registration of common shares — — 33 — — — — 33 Shares issued in exchange for common units — — 21 — — ( 21 ) — — Redeemable stock fair market value adjustment — — — ( 155 ) — — — ( 155 ) Adjustment for noncontrolling interests in Operating Partnership — — 71 — — ( 71 ) — — Amortization of unearned compensation — — 4,380 — — — — 4,380 Dividends on preferred stock — — — ( 922 ) — — — ( 922 ) Dividends on common stock ($ 1.000 per share) — — — ( 114,369 ) — — — ( 114,369 ) Dividends on noncontrolling interests units ($ 1.000 per share) — — — — — ( 3,866 ) — ( 3,866 ) Contribution from noncontrolling interest — — — — — — 262 262 EQUITY BALANCE SEPTEMBER 30, 2020 $ 9 $ 1,140 $ 7,173,391 $ ( 1,258,072 ) $ ( 12,396 ) $ 208,072 $ 7,111 $ 6,119,255 Changes in MAA’s total equity and its components for the nine months ended September 30, 2021 and 2020 were as follows (dollars in thousands): Mid-America Apartment Communities, Inc. Shareholders’ Equity Preferred Common Additional Accumulated Accumulated Noncontrolling Noncontrolling Total EQUITY BALANCE DECEMBER 31, 2020 $ 9 $ 1,141 $ 7,176,793 $ ( 1,294,182 ) $ ( 12,128 ) $ 206,927 $ 9,848 $ 6,088,408 Net income — — — 348,150 — 11,636 — 359,786 Other comprehensive income - derivative instruments — — — — 744 91 — 835 Issuance and registration of common shares — 2 ( 438 ) — — — — ( 436 ) Shares repurchased and retired — — ( 9,043 ) — — — — ( 9,043 ) Exercise of stock options — — 1,478 — — — — 1,478 Shares issued in exchange for common units — 6 33,266 — — ( 33,272 ) — — Redeemable stock fair market value adjustment — — — ( 7,545 ) — — — ( 7,545 ) Adjustment for noncontrolling interests in Operating Partnership — — 678 — — ( 678 ) — — Amortization of unearned compensation — — 14,151 — — — — 14,151 Dividends on preferred stock — — — ( 2,766 ) — — — ( 2,766 ) Dividends on common stock ($ 3.075 per share) — — — ( 353,168 ) — — — ( 353,168 ) Dividends on noncontrolling interests units ($ 3.075 per share) — — — — — ( 11,338 ) — ( 11,338 ) Contribution from noncontrolling interest — — — — — — 9,968 9,968 EQUITY BALANCE SEPTEMBER 30, 2021 $ 9 $ 1,149 $ 7,216,885 $ ( 1,309,511 ) $ ( 11,384 ) $ 173,366 $ 19,816 $ 6,090,330 Mid-America Apartment Communities, Inc. Shareholders’ Equity Preferred Common Additional Accumulated Accumulated Noncontrolling Noncontrolling Total EQUITY BALANCE DECEMBER 31, 2019 $ 9 $ 1,140 $ 7,166,073 $ ( 1,085,479 ) $ ( 13,178 ) $ 214,647 $ 6,247 $ 6,289,459 Net income — — — 171,620 — 6,096 — 177,716 Other comprehensive income - derivative instruments — — — — 782 28 — 810 Issuance and registration of common shares — — ( 344 ) — — — — ( 344 ) Shares repurchased and retired — — ( 5,657 ) — — — — ( 5,657 ) Exercise of stock options — — 71 — — — — 71 Shares issued in exchange for common units — — 471 — — ( 471 ) — — Redeemable stock fair market value adjustment — — — 1,659 — — — 1,659 Adjustment for noncontrolling interests in Operating Partnership — — 244 — — ( 244 ) — — Amortization of unearned compensation — — 12,533 — — — — 12,533 Dividends on preferred stock — — — ( 2,766 ) — — — ( 2,766 ) Dividends on common stock ($ 3.000 per share) — — — ( 343,106 ) — — — ( 343,106 ) Dividends on noncontrolling interests units ($ 3.000 per share) — — — — — ( 11,984 ) — ( 11,984 ) Contribution from noncontrolling interest — — — — — — 864 864 EQUITY BALANCE SEPTEMBER 30, 2020 $ 9 $ 1,140 $ 7,173,391 $ ( 1,258,072 ) $ ( 12,396 ) $ 208,072 $ 7,111 $ 6,119,255

MAALP Capital (Tables)

MAALP Capital (Tables)	9 Months Ended
	Sep. 30, 2021
M A A L P Capital [Abstract]
Summary of Changes in Total Capital and its Components	Changes in MAALP’s total capital and its components for the three months ended September 30, 2021 and 2020 were as follows (dollars in thousands): Mid-America Apartments, L.P. Unitholders’ Capital Limited General Preferred Accumulated Noncontrolling Total CAPITAL BALANCE JUNE 30, 2021 $ 185,340 $ 5,863,795 $ 66,840 $ ( 11,939 ) $ 16,612 $ 6,120,648 Net income 2,568 83,557 922 — — 87,047 Other comprehensive income - derivative instruments — — — 278 — 278 Issuance of units — ( 103 ) — — — ( 103 ) Exercise of unit options — 12 — — — 12 General partnership units issued in exchange for limited partnership units ( 11,108 ) 11,108 — — — — Redeemable units fair market value adjustment — ( 2,356 ) — — — ( 2,356 ) Adjustment for limited partners’ capital at redemption value 52 ( 52 ) — — — — Amortization of unearned compensation — 4,007 — — — 4,007 Distributions to preferred unitholders — — ( 922 ) — — ( 922 ) Distributions to common unitholders ($ 1.025 per unit) ( 3,486 ) ( 118,018 ) — — — ( 121,504 ) Contribution from noncontrolling interest — — — — 3,204 3,204 CAPITAL BALANCE SEPTEMBER 30, 2021 $ 173,366 $ 5,841,950 $ 66,840 $ ( 11,661 ) $ 19,816 $ 6,090,311 Mid-America Apartments, L.P. Unitholders’ Capital Limited General Preferred Accumulated Noncontrolling Total CAPITAL BALANCE JUNE 30, 2020 $ 209,894 $ 5,901,028 $ 66,840 $ ( 13,053 ) $ 6,849 $ 6,171,558 Net income 2,126 58,988 922 — — 62,036 Other comprehensive income - derivative instruments — — — 279 — 279 Issuance of units — 33 — — — 33 General partnership units issued in exchange for limited partnership units ( 21 ) 21 — — — — Redeemable units fair market value adjustment — ( 155 ) — — — ( 155 ) Adjustment for limited partners’ capital at redemption value ( 61 ) 61 — — — — Amortization of unearned compensation — 4,380 — — — 4,380 Distributions to preferred unitholders — — ( 922 ) — — ( 922 ) Distributions to common unitholders ($ 1.000 per unit) ( 3,866 ) ( 114,369 ) — — — ( 118,235 ) Contribution from noncontrolling interest — — — — 262 262 CAPITAL BALANCE SEPTEMBER 30, 2020 $ 208,072 $ 5,849,987 $ 66,840 $ ( 12,774 ) $ 7,111 $ 6,119,236 Changes in MAALP’s total capital and its components for the nine months ended September 30, 2021 and 2020 were as follows (dollars in thousands): Mid-America Apartments, L.P. Unitholders’ Capital Limited General Preferred Accumulated Noncontrolling Total CAPITAL BALANCE DECEMBER 31, 2020 $ 206,927 $ 5,817,270 $ 66,840 $ ( 12,496 ) $ 9,848 $ 6,088,389 Net income 11,636 345,384 2,766 — — 359,786 Other comprehensive income - derivative instruments — — — 835 — 835 Issuance of units — ( 436 ) — — — ( 436 ) Units repurchased and retired — ( 9,043 ) — — — ( 9,043 ) Exercise of unit options — 1,478 — — — 1,478 General partnership units issued in exchange for limited partnership units ( 33,272 ) 33,272 — — — — Redeemable units fair market value adjustment — ( 7,545 ) — — — ( 7,545 ) Adjustment for limited partners’ capital at redemption value ( 587 ) 587 — — — — Amortization of unearned compensation — 14,151 — — — 14,151 Distributions to preferred unitholders — — ( 2,766 ) — — ( 2,766 ) Distributions to common unitholders ($ 3.075 per unit) ( 11,338 ) ( 353,168 ) — — — ( 364,506 ) Contribution from noncontrolling interest — — — — 9,968 9,968 CAPITAL BALANCE SEPTEMBER 30, 2021 $ 173,366 $ 5,841,950 $ 66,840 $ ( 11,661 ) $ 19,816 $ 6,090,311 Mid-America Apartments, L.P. Unitholders’ Capital Limited General Preferred Accumulated Noncontrolling Total CAPITAL BALANCE DECEMBER 31, 2019 $ 214,647 $ 6,015,290 $ 66,840 $ ( 13,584 ) $ 6,247 $ 6,289,440 Net income 6,096 168,854 2,766 — — 177,716 Other comprehensive income - derivative instruments — — — 810 — 810 Issuance of units — ( 344 ) — — — ( 344 ) Units repurchased and retired — ( 5,657 ) — — — ( 5,657 ) Exercise of unit options — 71 — — — 71 General partnership units issued in exchange for limited partnership units ( 471 ) 471 — — — — Redeemable units fair market value adjustment — 1,659 — — — 1,659 Adjustment for limited partners’ capital at redemption value ( 216 ) 216 — — — — Amortization of unearned compensation — 12,533 — — — 12,533 Distributions to preferred unitholders — — ( 2,766 ) — — ( 2,766 ) Distributions to common unitholders ($ 3.000 per unit) ( 11,984 ) ( 343,106 ) — — — ( 355,090 ) Contribution from noncontrolling interest — — — — 864 864 CAPITAL BALANCE SEPTEMBER 30, 2020 $ 208,072 $ 5,849,987 $ 66,840 $ ( 12,774 ) $ 7,111 $ 6,119,236

Borrowings (Tables)

Borrowings (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Summary of Outstanding Debt	The following table summarizes the Company’s outstanding debt as of September 30, 2021 (dollars in thousands): Balance Weighted Average Effective Rate Weighted Average Contract Maturity Unsecured debt Variable rate commercial paper program $ 25,000 0.2 % 10/1/2021 Fixed rate senior notes 4,175,000 3.3 % 3/4/2029 Debt issuance costs, discounts, premiums and fair market value adjustments ( 24,744 ) Total unsecured debt $ 4,175,256 3.3 % Secured debt Fixed rate property mortgages $ 368,892 4.4 % 9/17/2048 Debt issuance costs ( 3,261 ) Total secured debt $ 365,631 4.4 % Total outstanding debt $ 4,540,887 3.4 %

Financial Instruments and Der_2

Financial Instruments and Derivatives (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Effect of Derivative Instruments on Consolidated Statement of Operations	The tables below present the effect of the Company’s derivative financial instruments on the Condensed Consolidated Statements of Operations for the three and nine months ended September 30, 2021 and 2020 (dollars in thousands): Derivatives in Cash Flow Hedging Relationships Location of Loss Reclassified Net Loss Reclassified from Accumulated OCL into Interest Expense (1) Three months ended September 30, from Accumulated OCL into Income 2021 2020 Terminated interest rate swaps Interest expense $ ( 278 ) $ ( 279 ) Nine months ended September 30, Terminated interest rate swaps Interest expense $ ( 835 ) $ ( 810 ) (1) See the Condensed Consolidated Statements of Comprehensive Income for changes in accumulated other comprehensive loss as these changes are presented net of the allocation to noncontrolling interests. Derivative Not Designated as Hedging Instrument Location of Gain (Loss) Recognized Gain (Loss) Recognized in Earnings on Derivative Three months ended September 30, in Income on Derivative 2021 2020 Preferred stock embedded derivative Other non-operating (income) expense $ 13,432 $ 1,342 Nine months ended September 30, Preferred stock embedded derivative Other non-operating (income) expense $ 11,492 $ ( 14,603 )

Shareholders' Equity of MAA (Ta

Shareholders' Equity of MAA (Tables)	9 Months Ended
	Sep. 30, 2021
Shareholders Equity Of M A A [Abstract]
Schedule of Cumulative Redeemable Preferred Stock	As of September 30, 2021, MAA had one outstanding series of cumulative redeemable preferred stock, which has the following characteristics: Description Outstanding Shares Liquidation Preference (1) Optional Redemption Date Redemption Price (2) Stated Dividend Yield Approximate Dividend Rate Series I 867,846 $ 50.00 10/1/2026 $ 50.00 8.50 % $ 4.25 (1) The total liquidation preference for the outstanding preferred stock is $ 43.4 million . (2) The redemption price is the price at which the preferred stock is redeemable, at MAA’s option, for cash.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2021
Loss Contingency [Abstract]
Schedule of Operating Lease Obligations	The table below reconciles undiscounted cash flows for each of the first five years and total of the remaining years to the operating lease obligations recorded on the Condensed Consolidated Balance Sheets as of September 30, 2021 (in thousands): Operating Leases 2021 $ 717 2022 2,894 2023 2,885 2024 2,862 2025 2,872 Thereafter 62,913 Total minimum lease payments 75,143 Net present value adjustments ( 44,425 ) Operating lease obligations $ 30,718

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2021
Notes To Financial Statements [Abstract]
Revenues and NOI for Reportable Segment	Revenues and NOI for each reportable segment for the three and nine months ended September 30, 2021 and 2020 were as follows (in thousands): Three months ended September 30, Nine months ended September 30, 2021 2020 2021 2020 Revenues: Same Store Rental revenues $ 431,030 $ 403,574 $ 1,249,053 $ 1,197,610 Other property revenues 2,966 3,103 9,302 9,159 Total Same Store revenues 433,996 406,677 1,258,355 1,206,769 Non-Same Store and Other Rental revenues 18,449 16,447 55,372 47,438 Other property revenues 130 75 780 116 Total Non-Same Store and Other revenues 18,579 16,522 56,152 47,554 Total rental and other property revenues $ 452,575 $ 423,199 $ 1,314,507 $ 1,254,323 Net Operating Income: Same Store NOI $ 269,393 $ 244,513 $ 779,194 $ 747,581 Non-Same Store and Other NOI 10,344 8,872 31,246 26,285 Total NOI 279,737 253,385 810,440 773,866 Depreciation and amortization ( 134,611 ) ( 127,679 ) ( 397,938 ) ( 381,257 ) Property management expenses ( 13,831 ) ( 12,691 ) ( 40,522 ) ( 39,064 ) General and administrative expenses ( 12,670 ) ( 11,360 ) ( 38,763 ) ( 35,181 ) Interest expense ( 39,234 ) ( 41,010 ) ( 117,773 ) ( 126,610 ) (Loss) gain on sale of depreciable real estate assets ( 313 ) 20 134,515 ( 7 ) Gain on sale of non-depreciable real estate assets 170 1,366 202 995 Other non-operating income (expense) 10,344 242 14,557 ( 13,647 ) Income tax expense ( 2,803 ) ( 665 ) ( 5,847 ) ( 2,532 ) Income from real estate joint venture 258 428 915 1,153 Net income attributable to noncontrolling interests ( 2,568 ) ( 2,126 ) ( 11,636 ) ( 6,096 ) Dividends to MAA Series I preferred shareholders ( 922 ) ( 922 ) ( 2,766 ) ( 2,766 ) Net income available for MAA common shareholders $ 83,557 $ 58,988 $ 345,384 $ 168,854
Assets for Reportable Segment	Assets for each reportable segment as of September 30, 2021 and December 31, 2020 were as follows (in thousands): September 30, 2021 December 31, 2020 Assets: Same Store $ 9,910,526 $ 10,076,511 Non-Same Store and Other 1,140,873 937,375 Corporate assets 202,733 180,905 Total assets $ 11,254,132 $ 11,194,791

Real Estate Acquisitions and _2

Real Estate Acquisitions and Dispositions (Tables)	9 Months Ended
	Sep. 30, 2021
Real Estate [Abstract]
Schedule of Real Estate Asset Acquisitions and Dispositions	The following table reflects the Company ’s acquisition activity for the nine months ended September 30, 2021: Multifamily Development Acquisitions (1) Market Units (2) Date Acquired Novel Daybreak Salt Lake City, UT 400 April 2021 Novel West Midtown Atlanta, GA 340 April 2021 (1) These pre-purchase multifamily community developments are being developed through joint ventures with a local developer. The Company owns 80 % of each joint venture that owns these properties. (2) Represents number of units upon completion of the development. Land Acquisition Market Acres Date Acquired MAA Westshore Tampa, FL 19 June 2021 The following table reflects the Company’s disposition activity for the nine months ended September 30, 2021: Multifamily Disposition Market Units Date Sold Crosswinds Jackson, MS 360 June 2021 Pear Orchard Jackson, MS 389 June 2021 Reflection Pointe Jackson, MS 296 June 2021 Lakeshore Landing Jackson, MS 196 June 2021 Land Disposition Market Acres Date Sold Colonial Promenade Huntsville, AL 1 September 2021 Tutwiler Birmingham, AL 9 September 2021

Basis of Presentation and Pri_3

Basis of Presentation and Principles of Consolidation and Significant Accounting Policies - Additional Information (Details)	9 Months Ended
	Sep. 30, 2021USD ($)PropertiesPropertyStateCommunityshares	Sep. 30, 2020shares	Dec. 31, 2022Property	Dec. 31, 2021Property	Dec. 31, 2020USD ($)Propertyshares
Real Estate Properties [Line Items]
General Partners' Capital Account, Units Outstanding | shares	115,138,323	114,369,812
Number of Real Estate Properties | Community	296
Development and capital improvements in progress	$ 236,339,000				$ 283,477,000
Number of States in which Entity Operates | State	16
Consolidated assets	$ 11,254,132,000				11,194,791,000
Consolidated liabilities	5,139,479,000				5,090,986,000
Real Estate Investments, Joint Ventures	18,700,000
Operating Lease, Right-of-Use Asset	47,700,000				49,400,000
Operating Lease, Liability	$ 30,718,000				31,700,000
Operating Lease, Weighted Average Remaining Lease Term	32 years
Operating Lease, Weighted Average Discount Rate, Percent	4.40%
Other Assets [Member]
Real Estate Properties [Line Items]
Real Estate Investments, Joint Ventures	$ 43,000,000				23,000,000
Real Estate [Member] | Post Massachusetts Avenue [Member]
Real Estate Properties [Line Items]
Real Estate Investments, Joint Ventures	42,800,000				43,300
Real Estate [Member] | Variable Interest Entity Primary Beneficiary [Member]
Real Estate Properties [Line Items]
Consolidated assets	218,800,000				128,900,000
Consolidated liabilities	$ 15,300,000				$ 8,100
Minimum [Member]
Real Estate Properties [Line Items]
Percentage of ownership interests of all consolidated subsidiaries (percent)	80.00%
Maximum [Member]
Real Estate Properties [Line Items]
Percentage of ownership interests of all consolidated subsidiaries (percent)	100.00%
Maximum [Member] | Accounting Standards Update 2016-02 [Member]
Real Estate Properties [Line Items]
Operating lease, term of contract	1 year
Limited Partner [Member]
Real Estate Properties [Line Items]
General Partners' Capital Account, Units Outstanding | shares	115,138,323				114,373,727
Number of Real Estate Properties | Property	1
Development and capital improvements in progress	$ 236,339,000				$ 283,477,000
Consolidated assets	11,254,132,000				11,194,791,000
Consolidated liabilities	$ 5,139,498,000				$ 5,091,005,000
Limited Partner [Member] | Minimum [Member]
Real Estate Properties [Line Items]
Percentage of ownership interests of all consolidated subsidiaries (percent)	80.00%
Limited Partner [Member] | Maximum [Member]
Real Estate Properties [Line Items]
Percentage of ownership interests of all consolidated subsidiaries (percent)	100.00%
Development Properties [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties	8				3
Number of units under development community | Properties	2,654
Development Properties [Member] | Expected Costs
Real Estate Properties [Line Items]
Development and capital improvements in progress	$ 627,500,000
Development Properties [Member] | Costs Incurred To Date
Real Estate Properties [Line Items]
Development and capital improvements in progress	$ 383,800
Development Properties [Member] | Scenario Forecast [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties | Property			3	2
Retail
Real Estate Properties [Line Items]
Number of Real Estate Properties | Property	32
M A A L P
Real Estate Properties [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	97.10%	96.60%

Earnings Per Common Share of _3

Earnings Per Common Share of MAA - Schedule of Computation of Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share Disclosure [Line Items]
Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest		$ 87,047	$ 62,036	$ 359,786	$ 177,716
Income from continuing operations attributable to noncontrolling interests		(2,568)	(2,126)	(11,636)	(6,096)
Income from continuing operations allocated to unvested restricted shares		(80)	(78)	(359)	(229)
Dividends on preferred stock		(922)	(922)	(2,766)	(2,766)
Income from continuing operations available for common shareholders, adjusted		$ 83,477	$ 58,910	$ 345,025	$ 168,625
Weighted average common shares - basic		114,933	114,216	114,568	114,177
Earnings per share - basic		$ 0.73	$ 0.52	$ 3.01	$ 1.48
Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest		$ 87,047	$ 62,036	$ 359,786	$ 177,716
Income from continuing operations attributable to noncontrolling interests	[1]	(2,568)	(2,126)	(11,636)	(6,096)
Net income available for MAA common shareholders, adjusted		$ 83,557	$ 58,988	$ 345,384	$ 168,854
Effect of dilutive securities		296	252	305	310
Weighted average common shares - diluted		115,229	114,468	114,873	114,487
Earnings per common share - diluted		$ 0.73	$ 0.52	$ 3.01	$ 1.47
Limited Partnership Units [Member]
Earnings Per Share Disclosure [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		3,500	4,100	3,800	4,100
[1]	For the three and nine months ended September 30, 2021 3.5 million OP Units and 3.8 million OP Units, respectively, and their related income are not included in the diluted earnings per share calculations as they are not dilutive. For the three and nine months ended September 30, 2020, 4.1 million OP Units and their related income are not included in the diluted earnings per share calculations as they are not dilutive.

Earnings Per OP Unit of MAALP -

Earnings Per OP Unit of MAALP - Schedule of Diluted Earnings per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share Disclosure [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 87,047	$ 62,036	$ 359,786	$ 177,716
Dividends on preferred stock	(922)	(922)	(2,766)	(2,766)
Income from continuing operations available for common shareholders, adjusted	$ 83,477	$ 58,910	$ 345,025	$ 168,625
Earnings per share - basic	$ 0.73	$ 0.52	$ 3.01	$ 1.48
Net income available for MAA common shareholders, adjusted	$ 83,557	$ 58,988	$ 345,384	$ 168,854
Effect of dilutive securities	296,000	252,000	305,000	310,000
Weighted average common shares - diluted	115,229,000	114,468,000	114,873,000	114,487,000
Earnings per common share - diluted	$ 0.73	$ 0.52	$ 3.01	$ 1.47
Limited Partner [Member]
Earnings Per Share Disclosure [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 87,047	$ 62,036	$ 359,786	$ 177,716
Income from continuing operations allocated to unvested restricted shares	(80)	(78)	359	(229)
Dividends on preferred stock	(922)	(922)	(2,766)	(2,766)
Income from continuing operations available for common shareholders, adjusted	$ 86,045	$ 61,036	$ 356,661	$ 174,721
Weighted average common units - basic	118,430	118,274	118,389	118,238
Earnings per share - basic	$ 0.73	$ 0.52	$ 3.01	$ 1.48
Net income available for MAA common shareholders, adjusted	$ 86,125	$ 61,114	$ 357,020	$ 174,950
Effect of dilutive securities	296	252	305	310
Weighted average common shares - diluted	118,726	118,526	118,694	118,548
Earnings per common share - diluted	$ 0.73	$ 0.52	$ 3.01	$ 1.48

MAA Equity - Summary of Changes

MAA Equity - Summary of Changes in Total Equity and its Components (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on preferred stock	$ (922)	$ (922)	$ (2,766)	$ (2,766)
Mid America Apartment Communities Inc. Shareholders Equity [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	6,120,667	6,171,577	6,088,408	6,289,459
Net Income Including Portion Attributable to Noncontrolling Interest	87,047	62,036	359,786	177,716
Other comprehensive income - derivative instruments	(278)	279	835	810
Issuance and registration of common shares	(103)	33	(436)	(344)
Shares repurchased and retired			(9,043)	(5,657)
Exercise of stock options	12		1,478	71
Redeemable stock fair market value adjustment	(2,356)	(155)	(7,545)	1,659
Amortization of unearned compensation	4,007	4,380	14,151	12,533
Dividends on preferred stock	(922)	(922)	(2,766)	(2,766)
Dividends on common stock	(118,018)	(114,369)	(353,168)	(343,106)
Dividends on noncontrolling interest units	(3,486)	(3,866)	(11,338)	(11,984)
Contribution from noncontrolling interest	3,204	262	9,968	864
Ending Balance	6,090,330	6,119,255	6,090,330	6,119,255
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Preferred Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	9	9	9	9
Ending Balance	9	9	9	9
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	1,147	1,140	1,141	1,140
Issuance and registration of common shares			2
Shares issued in exchange for common units	2		6
Ending Balance	1,149	1,140	1,149	1,140
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	7,201,885	7,168,886	7,176,793	7,166,073
Issuance and registration of common shares	(103)	33	(438)	(344)
Shares repurchased and retired			(9,043)	(5,657)
Exercise of stock options	12		1,478	71
Shares issued in exchange for common units	11,106	21	33,266	471
Adjustment for noncontrolling interests in Operating Partnership	22	71	678	244
Amortization of unearned compensation	4,007	4,380	14,151	12,533
Ending Balance	7,216,885	7,173,391	7,216,885	7,173,391
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Accumulated Distributions in Excess of Net Income [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(1,272,694)	(1,202,536)	(1,294,182)	(1,085,479)
Net income attributable to MAA	84,479	59,910	348,150	171,620
Redeemable stock fair market value adjustment	(2,356)	(155)	(7,545)	1,659
Dividends on preferred stock	(922)	(922)	(2,766)	(2,766)
Dividends on common stock	(118,018)	(114,369)	(353,168)	(343,106)
Ending Balance	(1,309,511)	(1,258,072)	(1,309,511)	(1,258,072)
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(11,632)	(12,665)	(12,128)	(13,178)
Other comprehensive income - derivative instruments	248	269	744	782
Ending Balance	(11,384)	(12,396)	(11,384)	(12,396)
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Noncontrolling Interests - Operating Partnership [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	185,340	209,894	206,927	214,647
Net Income Attributable to Noncontrolling Interest	2,568	2,126	11,636	6,096
Other comprehensive income - derivative instruments	(30)	10	91	28
Shares issued in exchange for common units	(11,108)	(21)	(33,272)	(471)
Adjustment for noncontrolling interests in Operating Partnership	(22)	(71)	(678)	(244)
Dividends on noncontrolling interest units	(3,486)	(3,866)	(11,338)	(11,984)
Ending Balance	173,366	208,072	173,366	208,072
Mid America Apartment Communities Inc. Shareholders Equity [Member] | Noncontrolling Interests - Consolidated Real Estate Entities [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	16,612	6,849	9,848	6,247
Contribution from noncontrolling interest	3,204	262	9,968	864
Ending Balance	$ 19,816	$ 7,111	$ 19,816	$ 7,111

MAA Equity - Summary of Chang_2

MAA Equity - Summary of Changes in Total Equity and its Components (Parenthetical) (Details) - Mid America Apartment Communities Inc. Shareholders Equity [Member] - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Equity [Line Items]
Dividends on common stock, per share	$ 1.025	$ 1	$ 3.075	$ 3
Dividends on noncontrolling interests, per unit	$ 1.025	$ 1	$ 3.075	$ 3

MAALP Capital - Summary of Chan

MAALP Capital - Summary of Changes in Total Capital and its Components (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Increase (Decrease) in Partners' Capital [Roll Forward]
Dividends on preferred stock	$ (922)	$ (922)	$ (2,766)	$ (2,766)
M A A L P
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	6,120,648	6,171,558	6,088,389	6,289,440
Net Income Available for Common Unitholders	87,047	62,036	359,786	177,716
Other comprehensive income - derivative instruments		279	835	810
Issuance of units	(103)	33	(436)	(344)
Units repurchased and retired			(9,043)	(5,657)
Exercise of unit options	12		1,478	71
Redeemable stock fair market value adjustment	(2,356)	(155)	(7,545)	1,659
Amortization of unearned compensation	4,007	4,380	14,151	12,533
Dividends on preferred stock	(922)	(922)	(2,766)	(2,766)
Distributions	(121,504)	(118,235)	(364,506)	(355,090)
Contribution from noncontrolling interest	3,204	262	9,968	864
Ending Balance	6,090,311	6,119,236	6,090,311	6,119,236
M A A L P | Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	185,340	209,894	206,927	214,647
Net income	2,568	2,126	11,636	6,096
General partnership units issued in exchange for limited partnership units	(11,108)	(21)	(33,272)	(471)
Adjustment for limited partners’ capital at redemption value	(52)	(61)	(587)	(216)
Distributions	(3,486)	(3,866)	(11,338)	(11,984)
Ending Balance	173,366	208,072	173,366	208,072
M A A L P | General Partners' Capital Account [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	5,863,795	5,901,028	5,817,270	6,015,290
Net Income Allocated to General Partners	83,557	58,988	345,384	168,854
Issuance of units	(103)	33	(436)	(344)
Units repurchased and retired			(9,043)	(5,657)
Exercise of unit options	12		1,478	71
General partnership units issued in exchange for limited partnership units	11,108	21	33,272	471
Redeemable stock fair market value adjustment	(2,356)	(155)	(7,545)	1,659
Adjustment for limited partners’ capital at redemption value	52	61	587	216
Amortization of unearned compensation	4,007	4,380	14,151	12,533
Dividends on preferred stock			0
Distributions	(118,018)	(114,369)	(353,168)	(343,106)
Ending Balance	5,841,950	5,849,987	5,841,950	5,849,987
M A A L P | Accumulated Distributions in Excess of Net Income [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	66,840	66,840	66,840	66,840
Net income	922	922	2,766	2,766
Dividends on preferred stock	(922)	(922)	(2,766)	(2,766)
Ending Balance	66,840	66,840	66,840	66,840
M A A L P | AOCI Attributable to Noncontrolling Interest [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	(11,939)	(13,053)	(12,496)	(13,584)
Other comprehensive income - derivative instruments		279	835	810
Ending Balance	(11,661)	(12,774)	(11,661)	(12,774)
M A A L P | Noncontrolling Interests-Consolidated Real Estate Entities [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance	16,612	6,849	9,848	6,247
Contribution from noncontrolling interest	3,204	262	9,968	864
Ending Balance	$ 19,816	$ 7,111	$ 19,816	$ 7,111

MAALP Capital - Summary of Ch_2

MAALP Capital - Summary of Changes in Total Capital and its Components (Parenthetical) (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
M A A L P | Limited Partner [Member]
Capital Disclosure [Line Items]
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 1.025	$ 1	$ 3.075	$ 3

Borrowings - Summary of Outstan

Borrowings - Summary of Outstanding Debt (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)
Debt Instrument [Line Items]
Total Outstanding Debt	$ 4,540,887
Debt Instrument, Interest Rate, Effective Percentage	3.40%
Fixed Rate Property Mortgages [Member]
Debt Instrument [Line Items]
Contract Maturity	Sep. 17, 2048
Unsecured Debt [Member]
Debt Instrument [Line Items]
Total Outstanding Debt	$ 4,175,256
Debt Instrument, Interest Rate, Effective Percentage	3.30%
Unsecured Debt [Member] | Fixed Rate Debt Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 4,175,000
Debt Instrument, Interest Rate, Effective Percentage	3.30%
Contract Maturity	Mar. 4, 2029
Unsecured Debt [Member] | Commercial Paper Notes [Member] | Variable Rate Commercial Paper Program [Member]
Debt Instrument [Line Items]
Unsecured Debt	$ 25,000
Debt Instrument, Interest Rate, Effective Percentage	0.20%
Contract Maturity	Oct. 1, 2021
Unsecured Debt [Member] | $1 billion unsecured revolving credit facility [Member] | Fair Market Value Adjustment and Debt Issuance Cost [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ (24,744)
Secured Debt [Member]
Debt Instrument [Line Items]
Total Outstanding Debt	365,631
Debt issuance costs	$ (3,261)
Debt Instrument, Interest Rate, Effective Percentage	4.40%
Secured Debt [Member] | Fixed Rate Property Mortgages [Member]
Debt Instrument [Line Items]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate	$ 368,892
Secured Debt [Member] | Fixed Rate Debt Senior Notes [Member]
Debt Instrument [Line Items]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate	$ 368,900
Debt Instrument, Interest Rate, Effective Percentage	4.40%
Contract Maturity	Dec. 31, 2048

Borrowings - Additional Informa

Borrowings - Additional Information (Details) $ in Thousands	1 Months Ended				3 Months Ended	9 Months Ended
	Sep. 30, 2021USD ($)	Aug. 31, 2021USD ($)	Jul. 31, 2021USD ($)	Feb. 28, 2021USD ($)ApartmentUnit	Sep. 30, 2021USD ($)	Sep. 30, 2021USD ($)
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	3.40%				3.40%	3.40%
Commercial Paper Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Payment Terms						397
Debt Instrument, Face Amount	$ 25,000				$ 25,000	$ 25,000
Debt Instrument, Unused Borrowing Capacity, Amount	161,500				161,500	161,500
Maximum [Member] | Commercial Paper Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500,000				$ 500,000	$ 500,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	3.30%				3.30%	3.30%
Unsecured Debt [Member] | Other Non-operating (Income) Expense [Member]
Debt Instrument [Line Items]
Prepayment penalties and Write-offs of unamortized costs					$ 13,400
Unsecured Debt [Member] | Fixed Rate Debt Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date						Mar. 4, 2029
Debt Instrument, Face Amount	$ 4,175,000				$ 4,175,000	$ 4,175,000
Debt Instrument, Interest Rate, Effective Percentage	3.30%				3.30%	3.30%
Unsecured Debt [Member] | Years to Maturity [Member] | Fixed Rate Debt Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Term						7 years 4 months 24 days
Unsecured Debt [Member] | Minimum [Member] | Fixed Rate Debt Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Term						5 years
Unsecured Debt [Member] | Maximum [Member] | Fixed Rate Debt Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Term						30 years
Unsecured Debt [Member] | $1 Billion Unsecured Revolving Credit Faciltiy [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 1,000,000				$ 1,000,000	$ 1,000,000
Line of Credit Facility, Maximum Borrowing Capacity	1,500,000				1,500,000	$ 1,500,000
Debt Instrument, Maturity Date						May 31, 2023
Line of Credit Facility, Amount Outstanding	0				0	$ 0
Letters of Credit Outstanding, Amount	3,400				3,400	$ 3,400
Unsecured Debt [Member] | $1 Billion Unsecured Revolving Credit Faciltiy [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate						0.75%
Unsecured Debt [Member] | $1 Billion Unsecured Revolving Credit Faciltiy [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate						1.45%
Unsecured Debt [Member] | Public Income Notes [Member] | Fixed Rate Debt Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	4,200,000				4,200,000	$ 4,200,000
Unsecured Debt [Member] | Private Placement [Member]
Debt Instrument [Line Items]
Retirement of tranche of Senior Unsecured Notes			$ 72,800
Unsecured Debt [Member] | Maturing in September 2026, Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Payment Terms		Interest on the 2026 Notes is payable semi-annually in arrears on March 15 and September 15 of each year beginning March 15, 2022.
Debt Instrument, Interest Rate, Stated Percentage		1.10%
Debt Instrument, Redemption Price, Percentage		99.553%
Proceeds from Debt, Net of Issuance Costs		$ 296,900
Debt Issuance Costs, Gross		$ 3,100
Debt Instrument, Interest Rate, Effective Percentage		1.191%
Unsecured Debt [Member] | Maturing in September 2026, Senior Notes [Member] | Fixed Rate Debt Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 300,000
Unsecured Debt [Member] | Maturing in November 2022, Trance of Senior Notes [Member]
Debt Instrument [Line Items]
Retirement of tranche of Senior Unsecured Notes	117,000
Unsecured Debt [Member] | Maturing in December 2022, Tranche of Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	250,000				$ 250,000	$ 250,000
Retirement of tranche of Senior Unsecured Notes	125,000
Unsecured Debt [Member] | Maturing in July 2023, Tranche of Senior Notes [Member]
Debt Instrument [Line Items]
Retirement of tranche of Senior Unsecured Notes	12,300
Unsecured Debt [Member] | Maturing in December 2024, Tranche of Senior Notes [Member]
Debt Instrument [Line Items]
Retirement of tranche of Senior Unsecured Notes	$ 20,000
Unsecured Debt [Member] | Maturing in September 2051, Six Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Payment Terms		Interest on the 2051 Notes is payable semi-annually in arrears on March 15 and September 15 of each year beginning March 15, 2022.
Debt Instrument, Face Amount		$ 300,000
Debt Instrument, Interest Rate, Stated Percentage		2.875%
Debt Instrument, Redemption Price, Percentage		98.588%
Proceeds from Debt, Net of Issuance Costs		$ 293,100
Debt Issuance Costs, Gross		$ 6,900
Debt Instrument, Interest Rate, Effective Percentage		2.946%
Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	4.40%				4.40%	4.40%
Secured Debt [Member] | Fixed Rate Debt Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date						Dec. 31, 2048
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate	$ 368,900				$ 368,900	$ 368,900
Debt Instrument, Interest Rate, Effective Percentage	4.40%				4.40%	4.40%
Secured Debt [Member] | Maturing July 2020, Three Property Mortgage [Member]
Debt Instrument [Line Items]
Repayments of Secured Debt				$ 118,600
Number of Apartment Communities | ApartmentUnit				8

Financial Instruments and Der_3

Financial Instruments and Derivatives - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		9 Months Ended
		Sep. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Preferred Stock, Redemption Price Per Share	[1]	$ 50
Preferred Stock, Redemption Date		Oct. 1, 2026
Designated as Hedging Instrument | Interest Expense
Derivative [Line Items]
Realized losses associated with terminated interest rate swaps that were designated as cash flow hedging instruments		$ 11.7
Change in fair value of interest rate derivatives included in AOCI and expected to be reclassified in the next 12 months		1.1
Fair Value, Measurements, Recurring [Member]
Derivative [Line Items]
Embedded Derivative, Fair Value of Embedded Derivative Asset		$ 50.5	$ 39
Conventional Variable Rate Debt [Member] | Maximum [Member]
Derivative [Line Items]
Debt Renewal Period		30 days
Fixed Rate Debt [Member]
Derivative [Line Items]
Notes Payable Excluding Interest Rate Swaps and Cap Agreements		$ 4,500	4,400
Notes Payable, Fair Value Disclosure		4,900	4,900
Floating Rate Debt [Member]
Derivative [Line Items]
Notes Payable Excluding Interest Rate Swaps and Cap Agreements		25	172
Notes Payable, Fair Value Disclosure		$ 25	$ 172
[1]	The redemption price is the price at which the preferred stock is redeemable, at MAA’s option, for cash.

Financial Instruments and Der_4

Financial Instruments and Derivatives - Effect of Derivative Instruments on Consolidated Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net			$ 11,492	$ (14,603)
Designated as Hedging Instrument | Interest Expense
Derivative [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (278)	$ (279)	(835)	(810)
Not Designated as Hedging Instrument | Interest Expense
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ 13,432	$ 1,342	$ 11,492	$ (14,603)

Shareholders' Equity of MAA - A

Shareholders' Equity of MAA - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Aug. 31, 2021	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Equity [Line Items]
Common stock, shares outstanding		115,138,323	115,138,323	114,369,812	114,373,727
Total common shares and operating partnership units outstanding		118,541,005	118,541,005	118,428,070
Proceeds from Stock Options Exercised, Net			$ 1.5	$ 0.1
Equity Forward Sale Agreements [Member]
Equity [Line Items]
Stock Issued During Period, Shares, New Issues	1,100,000
Common stock, price per share	$ 190.56
Common stock settlement under agreement	0
Common shares attributable to dilutive effect of equity forward agreements		0	0
Equity Option [Member]
Equity [Line Items]
Stock Issued During Period, Shares, New Issues			19,032	918
Noncontrolling Interest [Member]
Equity [Line Items]
Common Shares Issuable Upon Conversion Of Convertible Stock		3,402,682	3,402,682	4,058,258
Employee Stock Option [Member]
Equity [Line Items]
Common stock shares, outstanding option		813	813	19,845

Shareholders' Equity of MAA - S

Shareholders' Equity of MAA - Schedule of Cumulative Redeemable Preferred Stock (Details) - $ / shares		9 Months Ended		12 Months Ended
		Sep. 30, 2021		Dec. 31, 2020
Equity [Line Items]
Preferred Stock, Shares Outstanding		867,846		867,846
Preferred Stock, Liquidation Preference Per Share		$ 50	[1]	$ 50
Preferred Stock, Redemption Date		Oct. 1, 2026
Preferred Stock, Redemption Price Per Share	[2]	$ 50
Preferred Stock, Dividend Rate, Percentage		8.50%		8.50%
Preferred Stock, Dividend Rate, Per-Dollar-Amount		$ 4.25
Redeemable Preferred Stock [Member]
Equity [Line Items]
Preferred Stock, Shares Outstanding		867,846
[1]	The total liquidation preference for the outstanding preferred stock is $ 43.4 million .
[2]	The redemption price is the price at which the preferred stock is redeemable, at MAA’s option, for cash.

Shareholders' Equity of MAA -_2

Shareholders' Equity of MAA - Schedule of Cumulative Redeemable Preferred Stock (Parenthetical) (Details) $ in Millions	Sep. 30, 2021USD ($)
M A A Equity [Abstract]
Preferred Stock, Liquidation Preference, Value	$ 43.4

Partners' Capital of MAALP - Ad

Partners' Capital of MAALP - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Schedule Of Capital Structure [Line Items]
Operating partnership units outstanding	118,541,005	118,428,070
General Partners' Capital Account, Units Outstanding	115,138,323	114,369,812
Limited Partners' Capital Account, Units Outstanding	3,402,682	4,058,258
Preferred Stock, Shares Outstanding	867,846		867,846
Redeemable Preferred Stock [Member]
Schedule Of Capital Structure [Line Items]
Preferred Stock, Shares Outstanding	867,846
Noncontrolling Interest [Member]
Schedule Of Capital Structure [Line Items]
Common Shares Issuable Upon Conversion Of Convertible Stock	3,402,682	4,058,258
Limited Partners' Capital Account	$ 635.5	$ 470.6
Redeemable Capital Shares Par Or Stated Value Per Share	$ 186.75	$ 115.95
M A A L P
Schedule Of Capital Structure [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	97.10%	96.60%

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 5.2	$ 5.3
Cleven Litigation Case [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	54.6
Brown Litigation Case [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 8.4
Apartment Communities [Member]
Loss Contingencies [Line Items]
Lease expiration year	2074
Office Lease [Member]
Loss Contingencies [Line Items]
Lease expiration year	2028

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Operating Lease Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Loss Contingency [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 717
Operating Leases, Future Minimum Payments, Due in Two Years	2,894
Operating Leases, Future Minimum Payments, Due in Three Years	2,885
Operating Leases, Future Minimum Payments, Due in Four Years	2,862
Operating Leases, Future Minimum Payments, Due in Five Years	2,872
Operating Leases, Future Minimum Payments, Due Thereafter	62,913
Operating Leases, Future Minimum Payments Due	75,143
Net present value adjustments	(44,425)
Operating Lease, Liability	$ 30,718	$ 31,700

Segment Information - Additiona

Segment Information - Additional Information (Details)	9 Months Ended
	Sep. 30, 2021CommunityStateSegment
Segment Reporting Information [Line Items]
Number of owned or owned interests of apartment communities | Community	296
Number of States in which Entity Operates	16
Number of reportable segments | Segment	2
Period properties owned and stabilized	12 months
Occupancy level for Stabilized Communities	90.00%
Period Properties Stabilized	90 days
Same Store [Member]
Segment Reporting Information [Line Items]
Period properties owned and stabilized	12 months
Excluding Construction in Progress
Segment Reporting Information [Line Items]
Number of States in which Entity Operates	15

Segment Information - Revenues

Segment Information - Revenues and NOI for Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Information
Total operating revenues	$ 452,575	$ 423,199	$ 1,314,507	$ 1,254,323
Net Operating Income	279,737	253,385	810,440	773,866
Depreciation and amortization	(134,611)	(127,679)	(397,938)	(381,257)
Other Cost and Expense, Operating	(13,831)	(12,691)	(40,522)	(39,064)
General and administrative expenses	(12,670)	(11,360)	(38,763)	(35,181)
Interest expense	(39,234)	(41,010)	(117,773)	(126,610)
(Loss) gain on sale of depreciable real estate assets	(313)	20	134,515	(7)
Gain on sale of non-depreciable real estate assets	170	1,366	202	995
Other non-operating income (expense)	10,344	242	14,557	(13,647)
Income tax expense	(2,803)	(665)	(5,847)	(2,532)
Gain (loss) from real estate joint ventures	258	428	915	1,153
Net income attributable to noncontrolling interests	(2,568)	(2,126)	(11,636)	(6,096)
Preferred Stock Dividends, Income Statement Impact	(922)	(922)	(2,766)	(2,766)
Net income available for MAA common shareholders	83,557	58,988	345,384	168,854
Same Store [Member]
Segment Information
Revenue from Contract with Customer, Including Assessed Tax	431,030	403,574	1,249,053	1,197,610
Other operating income expense net	2,966	3,103	9,302	9,159
Total operating revenues	433,996	406,677	1,258,355	1,206,769
Net Operating Income	269,393	244,513	779,194	747,581
Non-Same Store and Other [Member]
Segment Information
Revenue from Contract with Customer, Including Assessed Tax	18,449	16,447	55,372	47,438
Other operating income expense net	130	75	780	116
Total operating revenues	18,579	16,522	56,152	47,554
Net Operating Income	$ 10,344	$ 8,872	$ 31,246	$ 26,285

Segment Information - Assets fo

Segment Information - Assets for Reportable Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 11,254,132	$ 11,194,791
Same Store [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	9,910,526	10,076,511
Non-Same Store and Other [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	1,140,873	937,375
Corporate Assets [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 202,733	$ 180,905

Real Estate Acquisitions and _3

Real Estate Acquisitions and Dispositions - Schedule of Real Estate Asset Acquisitions and Dispositions (Details)	9 Months Ended
	Sep. 30, 2021aApartmentUnit
Jackson, MS [Member] | Multifamily [Member] | Crosswinds [Member]
Acquisitionsand Disposals [Line Items]
Number of Units in Real Estate Property	360
Acquisition Date	2021-06
Jackson, MS [Member] | Multifamily [Member] | Pear Orchard [Member]
Acquisitionsand Disposals [Line Items]
Number of Units in Real Estate Property	389
Acquisition Date	2021-06
Jackson, MS [Member] | Multifamily [Member] | Reflection Pointe [Member]
Acquisitionsand Disposals [Line Items]
Number of Units in Real Estate Property	296
Acquisition Date	2021-06
Jackson, MS [Member] | Multifamily [Member] | Lakeshore Landing [Member]
Acquisitionsand Disposals [Line Items]
Number of Units in Real Estate Property	196
Acquisition Date	2021-06
Huntsville, AL [Member] | Land | Colonial Promenade [Member]
Acquisitionsand Disposals [Line Items]
Area of Land | a	1
Disposal Date	2021-09
Birmingham, AL [Member] | Land | Tutwiler [Member]
Acquisitionsand Disposals [Line Items]
Area of Land | a	9
Disposal Date	2021-09
Novel Daybreak [Member] | Salt Lake City, UT [Member] | Multifamily [Member]
Acquisitionsand Disposals [Line Items]
Number of Units in Real Estate Property	400
Acquisition Date	2021-04
Novel West Midtown [Member] | Atlanta, GA [Member] | Multifamily [Member]
Acquisitionsand Disposals [Line Items]
Number of Units in Real Estate Property	340
Acquisition Date	2021-04
M A A Westshore | Tampa F L | Land
Acquisitionsand Disposals [Line Items]
Area of Land | a	19
Disposal Date	2021-06

Real Estate Acquisitions and _4

Real Estate Acquisitions and Dispositions - Schedule of Real Estate Asset Acquisitions and Dispositions (Parenthetical) (Details)	Sep. 30, 2021
Novel West Midtown [Member]
Acquisitionsand Disposals [Line Items]
Joint venture interest	80.00%