Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Buildings and improvements	$ 1,050,817	$ 995,116
Land	506,968	505,153
Total real estate	1,557,785	1,500,269
Accumulated depreciation	(511,615)	(495,010)
Net real estate	1,046,170	1,005,259
Cash and cash equivalents	226,081	289,582
Restricted cash	9,224	9,153
Mezzanine investment	314,829	307,362
Right-of-use lease assets	443,111	98,280
Other assets, net	178,475	130,856
Total assets	2,217,890	1,840,492
LIABILITIES AND EQUITY
Non-recourse property debt and term loan, net	429,873	447,967
Notes payable to AIR	534,127	534,127
Total indebtedness	964,000	982,094
Deferred tax liabilities	125,732	131,560
Lease liabilities	446,962	100,496
Accrued liabilities and other	95,733	62,988
Total liabilities	1,632,427	1,277,138
Redeemable noncontrolling interest in consolidated real estate partnership	4,111	4,263
Commitments and contingencies (Note 4)	0	0
Equity/Partners' Capital:
Common Stock, $0.01 par value, 510,587,500 shares authorized, 149,208,479 and 149,036,263 shares issued/outstanding at March 31, 2021 and December 31, 2020, respectively	1,491	1,490
Additional paid-in capital	516,051	515,127
Retained earnings (Accumulated deficit)	3,375	(16,839)
Total Aimco equity	520,917	499,778
Noncontrolling interests in consolidated real estate partnerships	31,884	31,877
Common noncontrolling interests in Aimco Operating Partnership	28,551	27,436
Total equity	581,352	559,091
Total liabilities and equity	2,217,890	1,840,492
Aimco OP L.P. [Member]
ASSETS
Buildings and improvements	1,050,817	995,116
Land	506,968	505,153
Total real estate	1,557,785	1,500,269
Accumulated depreciation	(511,615)	(495,010)
Net real estate	1,046,170	1,005,259
Cash and cash equivalents	226,081	289,582
Restricted cash	9,224	9,153
Mezzanine investment	314,829	307,362
Right-of-use lease assets	443,111	98,280
Other assets, net	178,475	130,856
Total assets	2,217,890	1,840,492
LIABILITIES AND EQUITY
Non-recourse property debt and term loan, net	429,873	447,967
Notes payable to AIR	534,127	534,127
Total indebtedness	964,000	982,094
Deferred tax liabilities	125,732	131,560
Lease liabilities	446,962	100,496
Accrued liabilities and other	95,733	62,988
Total liabilities	1,632,427	1,277,138
Redeemable noncontrolling interest in consolidated real estate partnership	4,111	4,263
Commitments and contingencies (Note 4)
Equity/Partners' Capital:
General Partner and Special Limited Partner	520,917	499,778
Limited Partners	28,551	27,436
Partners’ capital attributable to Aimco Operating Partnership	549,468	527,214
Total liabilities and equity	2,217,890	1,840,492
Noncontrolling interests in consolidated real estate partnerships	31,884	31,877
Total partners’ capital	$ 581,352	$ 559,091