Aimco Properties 10-K 1 Mar 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2017	Feb. 27, 2018	Jun. 30, 2017
Entity Registrant Name	APARTMENT INVESTMENT & MANAGEMENT CO
Entity Central Index Key	922,864
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		157,330,262
Entity Public Float			$ 6.7
AIMCO PROPERTIES, L.P.
Entity Registrant Name	AIMCO PROPERTIES LP
Entity Central Index Key	926,660
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		164,901,915

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 76,786	$ 61,244
Total assets	6,079,040	6,232,818
LIABILITIES AND EQUITY
Total liabilities	4,321,750	4,184,651
Preferred noncontrolling interests in Aimco Operating Partnership (Note 7)	101,537	103,201
Commitments and contingencies (Note 5)
Equity:
Perpetual Preferred Stock (Note 6)	125,000	125,000
Common Stock, $0.01 par value, 500,787,260 shares authorized, 157,189,447 and 156,888,381 shares issued/outstanding at December 31, 2017 and 2016, respectively	1,572	1,569
Additional paid-in capital	3,900,042	4,051,722
Accumulated other comprehensive income	3,603	1,011
Distributions in excess of earnings	(2,367,073)	(2,385,399)
Total Aimco equity	1,663,144	1,793,903
Noncontrolling interests in consolidated real estate partnerships	(1,716)	151,121
Common noncontrolling interests in Aimco Operating Partnership	(5,675)	(58)
Total equity	1,655,753	1,944,966
Partners’ Capital:
Noncontrolling interests in consolidated real estate partnerships	(1,716)	151,121
Total liabilities and equity	6,079,040	6,232,818
Asset Management
ASSETS
Net real estate	224,873	245,648
Cash and cash equivalents	16,288	15,423
Restricted cash	30,928	33,501
Other assets	15,533	52,492
LIABILITIES AND EQUITY
Non-recourse property debt secured by Real Estate communities, net	227,141	236,426
Accrued liabilities and other	19,812	62,630
Deferred income	12,487	18,452
Aimco Real Estate
ASSETS
Buildings and improvements	6,174,149	6,106,298
Land	1,753,604	1,824,819
Total real estate	7,927,753	7,931,117
Accumulated depreciation	(2,522,358)	(2,421,357)
Net real estate	5,405,395	5,509,760
Cash and cash equivalents	60,498	45,821
Restricted cash	34,827	36,405
Other assets	272,739	293,768
Assets held for sale	17,959	0
LIABILITIES AND EQUITY
Non-recourse property debt secured by Real Estate communities, net	3,545,109	3,630,276
Term loan, net	249,501	0
Revolving credit facility borrowings	67,160	17,930
Total indebtedness associated with Real Estate portfolio	3,861,770	3,648,206
Accrued liabilities and other	200,540	218,937
AIMCO Properties, L.P.
ASSETS
Cash and cash equivalents	76,786	61,244
Total assets	6,079,040	6,232,818
LIABILITIES AND EQUITY
Total liabilities	4,321,750	4,184,651
Preferred noncontrolling interests in Aimco Operating Partnership (Note 7)	101,537	103,201
Commitments and contingencies (Note 5)
Equity:
Noncontrolling interests in consolidated real estate partnerships	(1,716)	151,121
Partners’ Capital:
Preferred units (Note 7)	125,000	125,000
General Partner and Special Limited Partner	1,538,144	1,668,903
Limited Partners	(5,675)	(58)
Partners’ capital attributable to the Aimco Operating Partnership	1,657,469	1,793,845
Noncontrolling interests in consolidated real estate partnerships	(1,716)	151,121
Total partners’ capital	1,655,753	1,944,966
Total liabilities and equity	6,079,040	6,232,818
AIMCO Properties, L.P. | Asset Management
ASSETS
Net real estate	224,873	245,648
Cash and cash equivalents	16,288	15,423
Restricted cash	30,928	33,501
Other assets	15,533	52,492
LIABILITIES AND EQUITY
Non-recourse property debt secured by Real Estate communities, net	227,141	236,426
Accrued liabilities and other	19,812	62,630
Deferred income	12,487	18,452
AIMCO Properties, L.P. | Aimco Real Estate
ASSETS
Buildings and improvements	6,174,149	6,106,298
Land	1,753,604	1,824,819
Total real estate	7,927,753	7,931,117
Accumulated depreciation	(2,522,358)	(2,421,357)
Net real estate	5,405,395	5,509,760
Cash and cash equivalents	60,498	45,821
Restricted cash	34,827	36,405
Other assets	272,739	293,768
Assets held for sale	17,959	0
LIABILITIES AND EQUITY
Non-recourse property debt secured by Real Estate communities, net	3,545,109	3,630,276
Term loan, net	249,501	0
Revolving credit facility borrowings	67,160	17,930
Total indebtedness associated with Real Estate portfolio	3,861,770	3,648,206
Accrued liabilities and other	$ 200,540	$ 218,937

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common stock, par value (dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,787,260	500,787,260
Common stock, shares issued (in shares)	157,189,447	156,888,381
Shares of common stock outstanding (in shares)	157,189,447	156,888,381

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
REVENUES:
Tax credit and transaction revenues	$ 13,243	$ 21,323	$ 24,356
Total revenues	1,005,437	995,854	981,310
OPERATING EXPENSES:
Depreciation and amortization	366,184	333,066	306,301
General and administrative expenses	43,657	46,784	46,310
Other expenses, net	11,353	14,295	10,368
Provision for real estate impairment loss	35,881	0	0
Total operating expenses	811,454	749,058	725,095
Operating income	193,983	246,796	256,215
Interest income	8,332	7,797	6,949
Interest expense	(194,615)	(196,389)	(199,685)
Other, net	7,694	6,071	387
Income before income taxes and gain on dispositions	15,394	64,275	63,866
Income tax benefit (Note 9)	32,126	25,208	27,524
Income before gain on dispositions	47,520	89,483	91,390
Gain on dispositions of real estate, net of tax	299,559	393,790	180,593
Net income	347,079	483,273	271,983
Noncontrolling interests:
Net income attributable to noncontrolling interests in consolidated real estate partnerships	(9,084)	(25,256)	(4,776)
Net income attributable to preferred noncontrolling interests in Aimco Operating Partnership	(7,764)	(7,239)	(6,943)
Net income attributable to common noncontrolling interests in Aimco Operating Partnership	(14,457)	(20,368)	(11,554)
Net income attributable to noncontrolling interests	(31,305)	(52,863)	(23,273)
Net income attributable to the company	315,774	430,410	248,710
Net income attributable to the company's preferred equityholders	(8,594)	(11,994)	(11,794)
Net income attributable to participating securities	(319)	(635)	(950)
Net income attributable to Aimco common stockholders	$ 306,861	$ 417,781	$ 235,966
Earnings attributable to the company per common share/unit - basic and diluted:
Net income attributable to the company per common share/unit - basic (in dollars per share)	$ 1.96	$ 2.68	$ 1.52
Net income attributable to the company per common share/unit - diluted (in dollars per share)	$ 1.96	$ 2.67	$ 1.52
Weighted average common shares/units outstanding - basic (in shares)	156,323	156,001	155,177
Weighted average common shares/units outstanding - diluted (in shares)	156,796	156,391	155,570
Asset Management
REVENUES:
Rental and other property revenues	$ 74,046	$ 74,640	$ 73,934
OPERATING EXPENSES:
Property operating expenses	35,440	36,956	37,537
Aimco Real Estate
REVENUES:
Rental and other property revenues	918,148	899,891	883,020
OPERATING EXPENSES:
Property operating expenses	318,939	317,957	324,579
AIMCO Properties, L.P.
REVENUES:
Tax credit and transaction revenues	13,243	21,323	24,356
Total revenues	1,005,437	995,854	981,310
OPERATING EXPENSES:
Depreciation and amortization	366,184	333,066	306,301
General and administrative expenses	43,657	46,784	46,310
Other expenses, net	11,353	14,295	10,368
Provision for real estate impairment loss	35,881	0	0
Total operating expenses	811,454	749,058	725,095
Operating income	193,983	246,796	256,215
Interest income	8,332	7,797	6,949
Interest expense	(194,615)	(196,389)	(199,685)
Other, net	7,694	6,071	387
Income before income taxes and gain on dispositions	15,394	64,275	63,866
Income tax benefit (Note 9)	32,126	25,208	27,524
Income before gain on dispositions	47,520	89,483	91,390
Gain on dispositions of real estate, net of tax	299,559	393,790	180,593
Net income	347,079	483,273	271,983
Noncontrolling interests:
Net income attributable to noncontrolling interests in consolidated real estate partnerships	(9,084)	(25,256)	(4,776)
Net income attributable to the company	337,995	458,017	267,207
Net income attributable to the company's preferred equityholders	(16,358)	(19,233)	(18,737)
Net income attributable to participating securities	(337)	(635)	(950)
Net income attributable to Aimco common stockholders	$ 321,300	$ 438,149	$ 247,520
Earnings attributable to the company per common share/unit - basic and diluted:
Net income attributable to the company per common share/unit - basic (in dollars per share)	$ 1.96	$ 2.68	$ 1.52
Net income attributable to the company per common share/unit - diluted (in dollars per share)	$ 1.96	$ 2.67	$ 1.52
Weighted average common shares/units outstanding - basic (in shares)	163,746	163,761	162,834
Weighted average common shares/units outstanding - diluted (in shares)	164,218	164,151	163,227
AIMCO Properties, L.P. | Asset Management
REVENUES:
Rental and other property revenues	$ 74,046	$ 74,640	$ 73,934
OPERATING EXPENSES:
Property operating expenses	35,440	36,956	37,537
AIMCO Properties, L.P. | Aimco Real Estate
REVENUES:
Rental and other property revenues	918,148	899,891	883,020
OPERATING EXPENSES:
Property operating expenses	$ 318,939	$ 317,957	$ 324,579

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income	$ 347,079	$ 483,273	$ 271,983
Other comprehensive income:
Unrealized (losses) gains on interest rate swaps	(173)	221	(1,299)
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive income	1,480	1,586	1,678
Unrealized gains on debt securities classified as available-for-sale	1,507	5,855	214
Other comprehensive income	2,814	7,662	593
Comprehensive income	349,893	490,935	272,576
Comprehensive income attributable to noncontrolling interests	(31,527)	(53,474)	(23,450)
Comprehensive income attributable to Aimco/Operating Partnership	318,366	437,461	249,126
AIMCO Properties, L.P.
Net income	347,079	483,273	271,983
Other comprehensive income:
Unrealized (losses) gains on interest rate swaps	(173)	221	(1,299)
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive income	1,480	1,586	1,678
Unrealized gains on debt securities classified as available-for-sale	1,507	5,855	214
Other comprehensive income	2,814	7,662	593
Comprehensive income	349,893	490,935	272,576
Comprehensive income attributable to noncontrolling interests	(9,185)	(25,516)	(4,932)
Comprehensive income attributable to Aimco/Operating Partnership	$ 340,708	$ 465,419	$ 267,644

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Total Aimco Equity	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Distributions in Excess of Earnings	Noncontrolling Interests
Beginning Balances (in shares) at Dec. 31, 2014			6,391	146,403
Beginning Balances at Dec. 31, 2014	$ 1,442,105	$ 1,227,735	$ 186,126	$ 1,464	$ 3,696,143	$ (6,456)	$ (2,649,542)	$ 214,370
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock (in shares)				9,430
Issuance of Common Stock	366,580	366,580		$ 94	366,486
Repurchase of Preferred Stock	(27,000)	(27,000)	$ (27,000)		695		(695)
Redemption of Aimco Operating Partnership units	(4,181)							(4,181)
Amortization of share-based compensation cost (in shares)				27
Amortization of share-based compensation cost	7,096	7,096			7,096
Effect of changes in ownership for consolidated entities	(1,819)	(6,008)			(6,008)			4,189
Change in accumulated other comprehensive income	593	416				416		177
Other, net (in shares)				466
Other, net	352	352		$ 5	247		100	0
Net income	265,040	248,710					248,710	16,330
Distributions to noncontrolling interests	(89,371)							(89,371)
Common Stock dividends	(184,391)	(184,391)					(184,391)
Preferred Stock dividends	(11,099)	(11,099)					(11,099)
Ending Balances (in shares) at Dec. 31, 2015			6,391	156,326
Ending Balances at Dec. 31, 2015	1,763,905	1,622,391	$ 159,126	$ 1,563	4,064,659	(6,040)	(2,596,917)	141,514
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of Preferred Stock (in shares)			(1,391)
Repurchase of Preferred Stock	(34,799)	(34,799)	$ (34,126)		1,307		(1,980)
Redemption of Aimco Operating Partnership units	(10,819)							(10,819)
Amortization of share-based compensation cost (in shares)				31
Amortization of share-based compensation cost	8,610	8,610			8,610
Effect of changes in ownership for consolidated entities	(16,064)	(26,171)			(26,171)			10,107
Change in accumulated other comprehensive income	7,662	7,051				7,051		611
Other, net (in shares)				531
Other, net	3,323	3,323		$ 6	3,317		0
Net income	476,034	430,410					430,410	45,624
Distributions to noncontrolling interests	(35,974)							(35,974)
Common Stock dividends	(206,898)	(206,898)					(206,898)
Preferred Stock dividends	(10,014)	(10,014)					(10,014)
Ending Balances (in shares) at Dec. 31, 2016			5,000	156,888
Ending Balances at Dec. 31, 2016	1,944,966	1,793,903	$ 125,000	$ 1,569	4,051,722	1,011	(2,385,399)	151,063
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of Aimco Operating Partnership units	(11,882)							(11,882)
Amortization of share-based compensation cost (in shares)				18
Amortization of share-based compensation cost	9,251	8,638			8,638			613
Contributions from noncontrolling interests	3,401							3,401
Effect of changes in ownership for consolidated entities	(312,775)	(160,586)			(160,586)			(152,189)
Change in accumulated other comprehensive income	2,814	2,592				2,592		222
Other, net (in shares)				283
Other, net	271	271		$ 3	268		0
Net income	339,315	315,774					315,774	23,541
Distributions to noncontrolling interests	(19,132)							(19,132)
Common Stock dividends	(226,172)	(226,172)					(226,172)
Preferred Stock dividends	(8,594)	(8,594)					(8,594)
Ending Balances (in shares) at Dec. 31, 2017			5,000	157,189
Ending Balances at Dec. 31, 2017	$ 1,655,753	$ 1,663,144	$ 125,000	$ 1,572	$ 3,900,042	$ 3,603	$ (2,367,073)	$ (7,391)

Consolidated Statements of Part

Consolidated Statements of Partners' Capital - USD ($) $ in Thousands	Total	AIMCO Properties, L.P.	AIMCO Properties, L.P.Partners’ Capital Attributable to the Partnership	AIMCO Properties, L.P.Preferred Units	AIMCO Properties, L.P.General Partner and Special Limited Partner	AIMCO Properties, L.P.Limited Partners	AIMCO Properties, L.P.Noncontrolling Interests
Partners' Capital at Dec. 31, 2014		$ 1,442,105	$ 1,208,809	$ 186,126	$ 1,041,609	$ (18,926)	$ 233,296
Increase (Decrease) in Partners' Capital [Roll Forward]
Issuance of preferred units to Aimco				0
Issuance of common partnership units to Aimco		366,580	366,580		366,580
Redemption of preferred units held by Aimco		(27,000)	(27,000)	(27,000)	0
Redemption of partnership units held by non-Aimco partners		(4,181)	(4,181)			(4,181)
Amortization of Aimco stock-based compensation		7,096	7,096		7,096
Effect of changes in ownership for consolidated entities		(1,819)	4,731		(6,008)	10,739	(6,550)
Change in accumulated other comprehensive loss	$ 593	593	437		416	21	156
Other, net		352	352		352	0	0
Net income		265,040	260,264		248,710	11,554	4,776
Distributions to noncontrolling interests	(89,371)	(80,313)					(80,313)
Distributions to common unitholders		(193,449)	(193,449)		(184,391)	(9,058)
Distributions to preferred unitholders		(11,099)	(11,099)		(11,099)
Partners' Capital at Dec. 31, 2015		1,763,905	1,612,540	159,126	1,463,265	(9,851)	151,365
Increase (Decrease) in Partners' Capital [Roll Forward]
Redemption of preferred units held by Aimco		(34,799)	(34,799)	(34,126)	(673)
Redemption of partnership units held by non-Aimco partners		(10,819)	(10,819)			(10,819)
Amortization of Aimco stock-based compensation		8,610	8,610		8,610
Effect of changes in ownership for consolidated entities		(16,064)	(16,064)		(26,171)	10,107	0
Change in accumulated other comprehensive loss	7,662	7,662	7,402		7,051	351	260
Other, net		3,323	3,323		3,323	0	0
Net income		476,034	450,778		430,410	20,368	25,256
Distributions to noncontrolling interests	(35,974)	(25,760)					(25,760)
Distributions to common unitholders		(217,112)	(217,112)		(206,898)	(10,214)
Distributions to preferred unitholders		(10,014)	(10,014)		(10,014)
Partners' Capital at Dec. 31, 2016		1,944,966	1,793,845	125,000	1,668,903	(58)	151,121
Increase (Decrease) in Partners' Capital [Roll Forward]
Redemption of partnership units held by non-Aimco partners		(11,882)	(11,882)			(11,882)
Amortization of Aimco stock-based compensation		9,251	9,251		8,638	613
Contributions from noncontrolling interests	3,401	3,401					3,401
Effect of changes in ownership for consolidated entities		(312,775)	(155,719)		(160,586)	4,867	(157,056)
Change in accumulated other comprehensive loss	2,814	2,814	2,713		2,592	121	101
Other, net		271	271		271	0	0
Net income		339,315	330,231		315,774	14,457	9,084
Distributions to noncontrolling interests	$ (19,132)	(8,367)					(8,367)
Distributions to common unitholders		(236,937)	(236,937)		(226,172)	(10,765)
Distributions to preferred unitholders		(8,594)	(8,594)		(8,594)
Partners' Capital at Dec. 31, 2017		$ 1,655,753	$ 1,657,469	$ 125,000	$ 1,538,144	$ (5,675)	$ (1,716)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 347,079	$ 483,273	$ 271,983
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	366,184	333,066	306,301
Gain on dispositions of real estate, net of tax	(299,559)	(393,790)	(180,593)
Provision for real estate impairment loss	35,881	0	0
Income tax benefit	(32,126)	(25,208)	(27,524)
Share-based compensation expense	7,877	7,629	6,640
Amortization of deferred loan costs and other	5,666	5,060	5,186
Other, net	(7,694)	(6,071)	(387)
Changes in operating assets and operating liabilities:
Accounts receivable and other assets	(13,375)	(20,680)	619
Accounts payable, accrued liabilities and other	(15,794)	(5,555)	(22,334)
Total adjustments	47,060	(105,549)	87,908
Net cash provided by operating activities	394,139	377,724	359,891
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of real estate and deposits related to purchases of real estate	(20,372)	(290,729)	(169,447)
Capital expenditures	(358,104)	(346,645)	(367,180)
Proceeds from dispositions of real estate	402,162	535,513	367,571
Purchases of corporate assets	(8,899)	(7,540)	(6,665)
Changes in restricted cash	1,506	1,374	(429)
Other investing activities	(1,589)	10,254	5,253
Net cash provided by (used in) investing activities	14,704	(97,773)	(170,897)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from non-recourse property debt	312,434	417,714	352,602
Principal repayments on non-recourse property debt	(409,167)	(371,947)	(514,294)
Proceeds from term loan	250,000	0	0
Net borrowings (repayments) on revolving credit facility	49,230	(9,070)	(85,330)
Proceeds from issuance of Common Stock	0	0	366,580
Redemptions of Preferred Stock	0	(34,799)	(27,000)
Payment of dividends to holders of Preferred Stock	(8,594)	(10,014)	(11,099)
Payment of dividends to holders of Common Stock	(225,377)	(206,279)	(184,082)
Payment of distributions to noncontrolling interests	(26,799)	(35,706)	(57,401)
Purchases and redemptions of noncontrolling interests	(327,815)	(26,485)	(4,517)
Other financing activities	(7,213)	7,090	(2,635)
Net cash used in financing activities	(393,301)	(269,496)	(167,176)
NET INCREASE IN CASH AND CASH EQUIVALENTS	15,542	10,455	21,818
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	61,244	50,789	28,971
CASH AND CASH EQUIVALENTS AT END OF PERIOD	76,786	61,244	50,789
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	196,438	200,278	207,087
Cash paid for income taxes	7,401	2,152	2,033
Non-cash transactions associated with the acquisition or disposition of real estate:
Non-recourse property debt assumed by buyer in connection with the disposition of real estate	0	0	6,068
Issuance of preferred OP Units in connection with acquisition of real estate	0	17,000	0
Other non-cash transactions:
Accrued capital expenditures (at end of period)	31,719	35,594	43,725
Accrued dividends on TSR restricted stock and LTIP awards (at end of period) (Note 8)	1,720	927	309
AIMCO Properties, L.P.
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	347,079	483,273	271,983
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	366,184	333,066	306,301
Gain on dispositions of real estate, net of tax	(299,559)	(393,790)	(180,593)
Provision for real estate impairment loss	35,881	0	0
Income tax benefit	(32,126)	(25,208)	(27,524)
Share-based compensation expense	7,877	7,629	6,640
Amortization of deferred loan costs and other	5,666	5,060	5,186
Other, net	(7,694)	(6,071)	(387)
Changes in operating assets and operating liabilities:
Accounts receivable and other assets	(13,375)	(20,680)	619
Accounts payable, accrued liabilities and other	(15,794)	(5,555)	(22,334)
Total adjustments	47,060	(105,549)	87,908
Net cash provided by operating activities	394,139	377,724	359,891
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of real estate and deposits related to purchases of real estate	(20,372)	(290,729)	(169,447)
Capital expenditures	(358,104)	(346,645)	(367,180)
Proceeds from dispositions of real estate	402,162	535,513	367,571
Purchases of corporate assets	(8,899)	(7,540)	(6,665)
Changes in restricted cash	1,506	1,374	(429)
Other investing activities	(1,589)	10,254	5,253
Net cash provided by (used in) investing activities	14,704	(97,773)	(170,897)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from non-recourse property debt	312,434	417,714	352,602
Principal repayments on non-recourse property debt	(409,167)	(371,947)	(514,294)
Proceeds from term loan	250,000	0	0
Net borrowings (repayments) on revolving credit facility	49,230	(9,070)	(85,330)
Proceeds from issuance of Common Stock	0	0	366,580
Redemptions of Preferred Stock	0	(34,799)	(27,000)
Payment of dividends to holders of Preferred Stock	(16,358)	(17,253)	(18,042)
Payment of distributions to General Partner and Special Limited Partner	(225,377)	(206,279)	(184,082)
Payment of distributions to Limited Partners	(10,667)	(10,214)	(6,701)
Payment of distributions to noncontrolling interests	(8,367)	(18,253)	(43,757)
Purchases and redemptions of noncontrolling interests	(314,269)	(13,941)	(320)
Other financing activities	(20,760)	(5,454)	(6,832)
Net cash used in financing activities	(393,301)	(269,496)	(167,176)
NET INCREASE IN CASH AND CASH EQUIVALENTS	15,542	10,455	21,818
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	61,244	50,789	28,971
CASH AND CASH EQUIVALENTS AT END OF PERIOD	76,786	61,244	50,789
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	196,438	200,278	207,087
Cash paid for income taxes	7,401	2,152	2,033
Non-cash transactions associated with the acquisition or disposition of real estate:
Non-recourse property debt assumed by buyer in connection with the disposition of real estate	0	0	6,068
Issuance of preferred OP Units in connection with acquisition of real estate	0	17,000	0
Other non-cash transactions:
Accrued capital expenditures (at end of period)	31,719	35,594	43,725
Accrued dividends on TSR restricted stock and LTIP awards (at end of period) (Note 8)	$ 1,818	$ 927	$ 309

Organization

Organization	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Apartment Investment and Management Company, or Aimco, is a Maryland corporation incorporated on January 10, 1994. Aimco is a self-administered and self-managed real estate investment trust, or REIT. AIMCO Properties, L.P., or the Aimco Operating Partnership, is a Delaware limited partnership formed on May 16, 1994, to conduct our business, which is focused on the ownership, management, redevelopment and limited development of quality apartment communities located in some of the largest markets in the United States. Aimco, through its wholly-owned subsidiaries, AIMCO-GP, Inc. and AIMCO-LP Trust, owns a majority of the ownership interests in the Aimco Operating Partnership. Aimco conducts all of its business and owns all of its assets through the Aimco Operating Partnership. Interests in the Aimco Operating Partnership that are held by limited partners other than Aimco are referred to as OP Units. OP Units include common partnership units, which we refer to as common OP Units, as well as partnership preferred units, which we refer to as preferred OP Units. As of December 31, 2017 , after eliminations for units held by consolidated subsidiaries, the Aimco Operating Partnership had 164,617,537 common partnership units outstanding. As of December 31, 2017 , Aimco owned 157,189,447 of the common partnership units ( 95.5% of the common partnership units) of the Aimco Operating Partnership and Aimco had outstanding an equal number of shares of its Class A Common Stock, which we refer to as Common Stock. Except as the context otherwise requires, “we,” “our” and “us” refer to Aimco, the Aimco Operating Partnership and their consolidated subsidiaries, collectively. As of December 31, 2017 , we owned an equity interest in 136 apartment communities with 36,904 apartment homes in our Real Estate portfolio. Our Real Estate portfolio, which comprises our reportable segment, is diversified by both price point and geography and consists of market rate apartment communities in which we own a substantial interest. We consolidated 132 of these apartment communities with 36,762 apartment homes. As of December 31, 2017 , we also held nominal ownership positions in partnerships that own 46 low-income housing tax credit apartment communities with 6,898 apartment homes. We provide services to these partnerships and receive fees and other payments in return. Our relationship with these partnerships is different than real estate ownership and is better described as an asset management business, or Asset Management. In accordance with accounting principles generally accepted in the United States of America, or GAAP, we are required to consolidate partnerships owning an aggregate of 39 apartment communities with 6,211 apartment homes.

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies Principles of Consolidation Aimco’s accompanying consolidated financial statements include the accounts of Aimco, the Aimco Operating Partnership, and their consolidated subsidiaries. The Aimco Operating Partnership’s consolidated financial statements include the accounts of the Aimco Operating Partnership and its consolidated subsidiaries. All significant intercompany balances have been eliminated in consolidation. Interests in the Aimco Operating Partnership that are held by limited partners other than Aimco are reflected in Aimco’s accompanying balance sheets as noncontrolling interests in Aimco Operating Partnership. Interests in partnerships consolidated into the Aimco Operating Partnership that are held by third parties are reflected in our accompanying balance sheets as noncontrolling interests in consolidated real estate partnerships. The assets of real estate partnerships consolidated by the Aimco Operating Partnership must first be used to settle the liabilities of such consolidated real estate partnerships. These consolidated real estate partnerships’ creditors do not have recourse to the general credit of the Aimco Operating Partnership. As used herein, and except where the context otherwise requires, “partnership” refers to a limited partnership or a limited liability company and “partner” refers to a partner in a limited partnership or a member of a limited liability company. Acquisition of Real Estate and Related Depreciation and Amortization We generally recognize the acquisition of apartment communities or interests in partnerships that own apartment communities at cost. The related transaction costs are generally included in the cost of the acquired apartment community. We allocate the cost of apartment communities acquired based on the relative fair value of the assets acquired and liabilities assumed. We determine the fair value of tangible assets, such as land, buildings, furniture, fixtures and equipment, generally using valuation techniques that consider comparable market transactions, replacement costs and other available information. We determine the fair value of identified intangible assets (or liabilities), which typically relate to in-place leases, using valuation techniques that consider the terms of the in-place leases, current market data for comparable leases and our experience in leasing similar communities. The intangible assets or liabilities related to in-place leases are comprised of: (a) the value of the above- and below-market leases in-place, measured over the period, including probable lease renewals for below-market leases, that the leases are expected to remain in effect; (b) the estimated unamortized portion of avoided leasing commissions and other costs that ordinarily would be incurred to originate the in-place leases; and (c) the value associated with leased apartment homes during an estimated absorption period (estimates of rental revenue that would not have been earned had leased apartment homes been vacant at the time of acquisition assuming lease-up periods based on market demand and stabilized occupancy levels). Depreciation for all tangible assets is calculated using the straight-line method over their estimated useful lives. Acquired buildings and improvements are depreciated over a useful life based on the age, condition and other physical characteristics of the apartment community. At December 31, 2017 , the weighted average depreciable life of our buildings and improvements was approximately 28 years. Furniture, fixtures and equipment associated with apartment communities are depreciated over five years. The above- and below-market lease intangibles are amortized to rental revenue over the expected remaining terms of the associated leases, which include reasonably assured renewal periods. Other intangible assets related to in-place leases are amortized to depreciation and amortization over the expected remaining terms of the associated leases. At December 31, 2017 and 2016 , deferred income in our consolidated balance sheets included below-market lease amounts totaling $9.1 million and $10.4 million , respectively, which are net of accumulated amortization of $34.4 million and $33.1 million , respectively. During the years ended December 31, 2017 , 2016 and 2015 , we included amortization of below-market leases of $1.3 million , $1.7 million and $1.7 million , respectively, in rental and other property revenues in our consolidated statements of operations. At December 31, 2017 , our below-market leases had a weighted average amortization period of 6.2 years and estimated aggregate amortization for each of the five succeeding years as follows (in thousands): Estimated Amortization 2018 $1,128 2019 998 2020 886 2021 811 2022 763 Capital Additions and Related Depreciation We capitalize costs, including certain indirect costs, incurred in connection with our capital additions activities, including redevelopments, developments, other tangible apartment community improvements and replacements of existing apartment community components. Included in these capitalized costs are payroll costs associated with time spent by site employees in connection with capital additions activities at the apartment community level. We characterize as “indirect costs” an allocation of certain department costs, including payroll, at the area operations and corporate levels that clearly relate to capital additions activities. We also capitalize interest, property taxes and insurance during periods in which redevelopments, developments and construction projects are in progress. We begin capitalization of costs, including certain indirect costs, incurred in connection with our capital addition activities, upon commencement of activities necessary to get apartment communities ready for their intended use. These activities include when apartment communities or apartment homes are undergoing physical construction, as well as when apartment homes are held vacant in advance of planned construction, provided that other activities such as permitting, planning and design are in progress. We cease the capitalization of costs when the apartment communities are substantially complete and ready for their intended use, which is typically when construction has been completed and apartment homes are available for occupancy. Costs, including ordinary repairs, maintenance and resident turnover costs, are charged to property operating expense as incurred. We depreciate capitalized costs using the straight-line method over the estimated useful life of the related improvement, which is generally 5 , 15 or 30 years. All capitalized site payroll costs and indirect costs are allocated to capital additions proportionately, based on direct costs and depreciated over the estimated useful lives of such capital additions. Certain homogeneous items that are purchased in bulk on a recurring basis, such as carpeting and appliances, are depreciated using group methods that reflect the average estimated useful life of the items in each group. Except in the case of apartment community casualties, where the net book value of the lost asset is written off in the determination of casualty gains or losses, we generally do not recognize any loss in connection with the replacement of an existing apartment community component because normal replacements are considered in determining the estimated useful lives used in connection with our composite and group depreciation methods. For the years ended December 31, 2017 , 2016 and 2015 , we capitalized to buildings and improvements $7.6 million , $9.6 million and $11.7 million of interest costs, respectively, and $36.0 million , $32.9 million and $28.2 million of other direct and indirect costs, respectively. Impairment of Long-Lived Assets Real estate and other long-lived assets to be held and used are stated at cost, less accumulated depreciation and amortization, unless the carrying amount of the asset is not recoverable. If events or circumstances indicate that the carrying amount of an apartment community may not be recoverable, we make an assessment of its recoverability by comparing the carrying amount to our estimate of the undiscounted future cash flows, excluding interest charges, of the apartment community. If the carrying amount exceeds the aggregate undiscounted future cash flows, we recognize an impairment loss to the extent the carrying amount exceeds the estimated fair value of the apartment community. Cash Equivalents We classify highly liquid investments with an original maturity of three months or less as cash equivalents. We maintain cash equivalents in financial institutions in excess of insured limits. We have not experienced any losses in these accounts in the past and believe that we are not exposed to significant credit risk because our accounts are deposited with major financial institutions. Restricted Cash Restricted cash includes capital replacement reserves, completion repair reserves, bond sinking fund amounts, tax and insurance escrow accounts held by lenders and resident security deposits. Other Assets At December 31, 2017 and 2016 , other assets was comprised of the following amounts (dollars in thousands): 2017 2016 Investments in securitization trust that holds Aimco property debt $ 82,794 $ 76,063 Accumulated unrecognized deferred tax expense from intercompany transfers — 62,468 Deferred tax asset, net (Note 9) 32,227 5,076 Intangible assets, net 38,701 39,039 Prepaid expenses, commissions, real estate taxes and insurance 36,508 37,082 Software, equipment and leasehold improvements 20,048 22,209 Investments in unconsolidated real estate partnerships 12,636 12,496 Accounts receivable, net 11,417 13,042 Deferred expenses, deposits, notes receivable and other 38,408 26,293 Other assets per consolidated balance sheets $ 272,739 $ 293,768 As discussed under the Accounting Pronouncements Adopted in the Current Year heading, on January 1, 2017, we recognized a cumulative effect adjustment to retained earnings and partners’ capital, which reduced to zero the accumulated unrecognized deferred tax expense from intercompany transfers. The table above excludes other assets of partnerships served by our Asset Management business, which are presented separately on our consolidated balance sheet. Investments in Securitization Trust that holds Aimco Property Debt We hold investments in a securitization trust that primarily holds certain of our property debt. These investments were initially recognized at their purchase price and the discount to the face value is being accreted into interest income over the expected term of the securities. We have designated these investments as available for sale securities and we measure these investments at fair value with changes in their fair value, other than the changes attributed to the accretion described above, recognized as an adjustment of accumulated other comprehensive income or loss within equity and partners’ capital. Refer to Note 11 for further information regarding these debt securities. Intangible Assets At December 31, 2017 and 2016 , other assets included goodwill associated with our reportable segment of $37.8 million . We perform an annual impairment test of goodwill by evaluating qualitative factors to determine the likelihood that goodwill may be impaired. We primarily consider the fair value of our real estate portfolio and the fair value of our debt relative to their carrying values. As a result of the qualitative analysis, we do not believe our goodwill is impaired as of the date of our annual test. During the years ended December 31, 2016 and 2015 , we allocated $4.5 million and $1.2 million , respectively, of goodwill related to our reportable segments to the carrying amounts of the apartment communities sold or classified as held for sale. The amounts of goodwill allocated to these apartment communities were based on the relative fair values of the apartment communities sold or classified as held for sale. As further discussed under the Accounting Pronouncements Adopted in the Current Year heading, commencing in 2017 we no longer allocate goodwill to the carrying amounts of apartment communities sold or classified as held for sale that do not meet the definition of a business. Capitalized Software Costs Purchased software and other costs related to software purchased or developed for internal use are capitalized during the application development stage and are amortized using the straight-line method over the estimated useful life of the software, generally three to five years. For the years ended December 31, 2017 , 2016 and 2015 , we capitalized software purchase and development costs totaling $2.0 million , $3.4 million and $3.6 million , respectively. At December 31, 2017 and 2016 , other assets included $9.1 million and $12.6 million of net capitalized software, respectively. During the years ended December 31, 2017 , 2016 and 2015 , we recognized amortization of capitalized software of $5.5 million , $7.2 million and $6.9 million , respectively, which is included in depreciation and amortization in our consolidated statements of operations. Investments in Unconsolidated Real Estate Partnerships We own general and limited partner interests in partnerships that either directly, or through interests in other real estate partnerships, own apartment communities. We generally account for investments in real estate partnerships that we do not consolidate under the equity method. Under the equity method, we recognize our share of the earnings or losses of the entity for the periods presented, inclusive of our share of any impairments and disposition gains recognized by and related to such entities, and we present such amounts within other, net in our consolidated statements of operations. The excess of the cost of the acquired partnership interests over the historical carrying amount of partners’ equity or deficit is generally ascribed to the fair values of land and buildings owned by the partnerships. We amortize the excess cost related to the buildings over the related estimated useful lives. Such amortization is recorded as an adjustment of the amounts of earnings or losses we recognize from such unconsolidated real estate partnerships. Deferred Costs We defer lender fees and other direct costs incurred in obtaining new financing and amortize the amounts over the terms of the related loan agreements. Amortization of these costs is included in interest expense. Debt issue costs associated with our revolving credit facility are included in other assets on our consolidated balance sheets. Debt issue costs associated with non-recourse property debt and our term loan are presented as a direct deduction from the related liabilities on our consolidated balance sheets. We defer leasing commissions and other direct costs incurred in connection with successful leasing efforts and amortize the costs over the terms of the related leases. Amortization of these costs is included in depreciation and amortization. Noncontrolling Interests in Consolidated Real Estate Partnerships We report the unaffiliated partners’ interests in the net assets of our consolidated real estate partnerships as noncontrolling interests in consolidated real estate partnerships within consolidated equity and partners’ capital. Noncontrolling interests in consolidated real estate partnerships consist primarily of equity interests held by limited partners in consolidated real estate partnerships that have finite lives. We generally attribute to noncontrolling interests their share of income or loss of consolidated partnerships based on their proportionate interest in the results of operations of the partnerships, including their share of losses even if such attribution results in a deficit noncontrolling interest balance within our equity and partners’ capital accounts. The terms of the related partnership agreements generally require the partnerships to be liquidated following the sale of the underlying real estate. As the general partner in these partnerships, we ordinarily control the execution of real estate sales and other events that could lead to the liquidation, redemption or other settlement of noncontrolling interests. Changes in our ownership interest in consolidated real estate partnerships generally consist of our purchase of an additional interest in or the sale of our entire interest in a consolidated real estate partnership. The effect on our equity and partners’ capital of our purchase of additional interests in consolidated real estate partnerships during the years ended December 31, 2017 , 2016 and 2015 , is shown in our consolidated statements of equity and partners’ capital. The effect on our equity and partners’ capital of sales of consolidated real estate or sales of our entire interest in consolidated real estate partnerships is reflected in our consolidated financial statements as gains on disposition of real estate and accordingly the effect on our equity and partners’ capital is reflected within the amount of net income allocated to us and to noncontrolling interests. Upon our deconsolidation of a real estate partnership following the sale of our partnership interests or liquidation of the partnership following sale of the related apartment community, we derecognize any remaining noncontrolling interest of the associated partnership previously recorded in our consolidated balance sheets. Noncontrolling Interests in Aimco Operating Partnership Noncontrolling interests in Aimco Operating Partnership consist of common OP Units and preferred OP Units. Holders of preferred OP Units participate in the Aimco Operating Partnership’s income or loss only to the extent of their preferred distributions. Within Aimco’s consolidated financial statements, after provision for Preferred OP Unit distributions, the Aimco Operating Partnership’s income or loss is allocated to the holders of common partnership units based on the weighted average number of common partnership units (including those held by Aimco) outstanding during the period. During the years ended December 31, 2017 , 2016 and 2015 , the holders of common OP Units had a weighted average ownership interest in the Aimco Operating Partnership of 4.5% , 4.7% and 4.7% , respectively. See Note 7 for further information regarding the items comprising noncontrolling interests in the Aimco Operating Partnership. Revenue Recognition Our apartment communities have operating leases with apartment residents with terms averaging 12 months. We recognize rental revenue related to these leases, net of any concessions, on a straight-line basis over the term of the lease. We recognize revenues from asset management and other services when the related fees are earned and realized or realizable. Asset Management Business We are the general partner in certain low-income housing tax credit partnerships, which are structured to provide for the pass-through of tax credits and deductions to their partners. The tax credits are generally realized ratably over the first ten years of the tax credit arrangement and are subject to the partnership’s compliance with applicable laws and regulations for a period of 15 years . We hold nominal ownership positions in these partnerships, generally less than one percent. At inception, each investor agreed to fund capital contributions to the partnerships and we received a syndication fee from the partnerships upon the investors’ admission to the partnership. In our role, we provide asset management and other services to these partnerships and we receive fees and other payments in return. To the extent amounts due to us are not paid currently, the balances accrue and are satisfied from the partnerships’ future operating or liquidating cash flow. Capital contributions received by the partnerships from tax credit investors represent, in substance, consideration that we receive in exchange for our obligation to deliver tax credits and other tax benefits to the investors. We record these contributions as deferred income in our consolidated balance sheets upon receipt, and we recognize these amounts as revenue in our consolidated statements of operations when our obligation to the investors is relieved upon delivery of the tax benefits. We consolidate the low-income housing tax credit partnerships in which we are the sole general partner, as further discussed in Note 13 . When the contractual arrangements obligate us to deliver tax benefits to the investors, and entitle us through fee arrangements to receive substantially all available cash flow from the partnerships, we recognize the income or loss generated by the underlying real estate based on our economic interest in the partnerships’ current period results, which is approximately 100% and represents the allocation of cash available for distribution we would receive from a hypothetical liquidation at the book value of the partnership’s net assets. Our economic interest in these partnerships will be 100% until the limited partners become entitled to an allocation of distributable cash (generally upon sale of the underlying real estate). Our economic interest generally differs from our legal interest. Insurance We believe our insurance coverages insure our apartment communities adequately against the risk of loss attributable to fire, earthquake, hurricane, tornado, flood and other perils. In addition, we have third-party insurance coverage (after self-insured retentions) that defray the costs of large workers’ compensation, health and general liability exposures. We accrue losses based upon our estimates of the aggregate liability for uninsured losses incurred using certain actuarial assumptions followed in the insurance industry and based on our experience. Share-Based Compensation We issue various forms of share-based compensation, including stock options and restricted stock awards with service conditions and/or market conditions. We recognize share-based employee compensation based on the fair value on the grant date and recognize compensation cost over the awards’ requisite service periods. We reduce compensation cost related to forfeited awards in the period of forfeiture. See Note 8 for further discussion of our share-based compensation. Income Taxes Aimco has elected to be taxed as a REIT under the Internal Revenue Code commencing with its taxable year ended December 31, 1994, and it intends to continue to operate in such a manner. Aimco’s current and continuing qualification as a REIT depends on its ability to meet the various requirements imposed by the Internal Revenue Code, which are related to organizational structure, distribution levels, diversity of stock ownership and certain restrictions with regard to owned assets and categories of income. If Aimco qualifies for taxation as a REIT, it will generally not be subject to United States federal corporate income tax on its taxable income that is currently distributed to stockholders. This treatment substantially eliminates the “double taxation” (at the corporate and stockholder levels) that generally results from an investment in a corporation. Even if Aimco qualifies as a REIT, it may be subject to United States federal income and excise taxes in various situations, such as on our undistributed income. Aimco also will be required to pay a 100% tax on any net income on non-arm’s length transactions between it and a TRS (described below) and on any net income from sales of apartment communities that were held for sale in the ordinary course. The state and local tax laws may not conform to the United States federal income tax treatment, and Aimco may be subject to state or local taxation in various state or local jurisdictions, including those in which we transact business. Any taxes imposed on us reduce our operating cash flow and net income. Certain of our operations or a portion thereof, including property management and risk management, are conducted through taxable REIT subsidiaries, which are subsidiaries of the Aimco Operating Partnership, and each of which we refer to as a TRS. A TRS is a subsidiary C-corporation that has not elected REIT status and as such is subject to United States federal corporate income tax. We use TRS entities to facilitate our ability to offer certain services and activities to our residents and investment partners that cannot be offered directly by a REIT. We also use TRS entities to hold investments in certain apartment communities. For our TRS entities, deferred income taxes result from temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for United States federal income tax purposes, and are measured using the enacted tax rates and laws that are expected to be in effect when the differences reverse. We reduce deferred tax assets by recording a valuation allowance when we determine, based on available evidence, that it is more likely than not that the assets will not be realized. As further discussed under the Accounting Pronouncements Adopted in the Current Year heading within this note, commencing in 2017, we recognize the tax consequences associated with intercompany transfers between the Aimco Operating Partnership and TRS entities when such transactions occur. Refer to Note 9 for further information about our income taxes. Comprehensive Income or Loss As discussed under the preceding Investments in Securitization Trust that holds Aimco Property Debt heading, we have investments that are measured at fair value with unrealized gains or losses recognized as an adjustment of accumulated other comprehensive loss within equity and partners’ capital. Additionally, as discussed in Note 11 , we recognize changes in the fair value of our cash flow hedges as an adjustment of accumulated other comprehensive loss within equity and partners’ capital. The amounts of consolidated comprehensive income for the years ended December 31, 2017 , 2016 and 2015 , along with the corresponding amounts of such comprehensive income attributable to Aimco, the Aimco Operating Partnership and to noncontrolling interests, are presented within the accompanying consolidated statements of comprehensive income. Earnings per Share and Unit Aimco and the Aimco Operating Partnership calculate earnings (loss) per share and unit based on the weighted average number of shares of Common Stock or common partnership units, participating securities, common stock or common unit equivalents and dilutive convertible securities outstanding during the period. The Aimco Operating Partnership considers both common partnership units and equivalents, which have identical rights to distributions and undistributed earnings, to be common units for purposes of the earnings per unit computations. See Note 10 for further information regarding earnings per share and unit computations. Use of Estimates The preparation of our consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts included in the financial statements and accompanying notes thereto. Actual results could differ from those estimates. Reclassifications Certain items included in the 2016 and 2015 financial statements have been reclassified to conform to the current presentation. Accounting Pronouncements Adopted in the Current Year During 2017, we elected to adopt early the new accounting standard that revised the GAAP definition of a business. Under the new standard we expect apartment communities will no longer be considered businesses; therefore, transaction costs incurred related to the acquisition of real estate operations will be capitalized as a cost of the acquisition. Additionally, we will no longer allocate goodwill to sales of apartment communities for purposes of calculating gain or loss upon sale. We have applied the new standard prospectively to transactions occurring after adoption, which did not have a significant effect on our financial condition or results of operations. Effective January 1, 2017, we adopted a new standard issued by the Financial Accounting Standards Board, or FASB, that simplifies the accounting for the income tax consequences of intercompany transfers of assets. Previously, the recognition within the statement of operations of income tax expense or benefit resulting from an intercompany transfer of assets did not occur until the assets affect GAAP income or loss, for example, through depreciation, impairment or upon the sale of the asset to a third-party. Under the new standard, we are required to recognize the income tax expense or benefit from an intercompany transfer of assets when the transfer occurs. We have applied this change on a modified retrospective basis and recognized a cumulative effect adjustment to retained earnings and partners’ capital of $65.7 million as of January 1, 2017, representing accumulated unrecognized tax expense from intercompany transfers between the Aimco Operating Partnership and TRS entities. Such amounts were included in other assets within our consolidated balance sheets at December 31, 2016. Also effective January 1, 2017, we adopted guidance that simplifies the accounting for share-based compensation. Under prior practice, tax benefits in excess of those associated with compensation cost recognized in accordance with GAAP, or windfalls, were recorded in equity and tax deficiencies were recorded in equity until previous windfalls had been recovered and then recognized in earnings. Under the new guidance, all of the tax effects related to share-based compensation are recognized through earnings. This guidance is applied to all windfalls and tax deficiencies resulting from settlements occurring after January 1, 2017. The new guidance also requires windfalls to be recorded in the period the related transaction triggering tax consequences occurs, such as an exercise of stock options or vesting of restricted shares. This change in timing of recognition has been applied on a modified retrospective basis. We did not record a cumulative effect adjustment to opening retained earnings on the date of adoption as there were no accumulated windfalls recorded in equity. Compared to prior periods, we may experience incremental volatility in income tax benefit or expense resulting from the recognition in earnings of windfall benefits or deficiencies upon the exercise of stock options and vesting of restricted shares. Recent Accounting Pronouncements The FASB has issued new standards that affect accounting for revenue from contracts with customers and are effective for us on January 1, 2018. The new revenue standards establish a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersede most current GAAP applicable to revenue recognition. The core principle of the new guidance is that revenue should only be recognized when an entity has transferred control of goods or services to a customer and for an amount reflecting the consideration to which the entity expects to be entitled for such exchange. We have completed our analysis of the effect this guidance will have on our consolidated financial statements and have determined we will not recognize a cumulative effect adjustment upon adoption. We do not anticipate changes to the timing or amount of revenue we recognize on an ongoing basis as substantially all of our revenue is earned from leases and is subject to the current lease standard until the adoption of the new lease standard, which is discussed below. The FASB has also issued a new standard on lease accounting, which is effective for us on January 1, 2019. Under the new lease standard, lessor accounting will be largely unchanged, but lessees will be required to recognize a right of use asset and a lease liability for virtually all leases, with such leases classified as either operating or finance. The new standard must be adopted using a modified retrospective method, which requires application of the new guidance at the beginning of the earliest comparative period presented and provides for certain practical expedients, which we anticipate electing. We do not anticipate significant changes in the timing of income from our leases with residents. However, in circumstances where we are a lessee, in primarily a limited population of ground leases and leases for corporate office space, we will be required to recognize right of use assets and related lease liabilities on

Significant Transactions

Significant Transactions	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Significant Transactions	Significant Transactions Reacquisition of Limited Partner Interest in Palazzo Joint Venture During the year ended December 31, 2017 , we reacquired for $451.5 million , the 47% noncontrolling limited partner interest in the Palazzo joint venture, which owns three communities with a total of 1,382 apartment homes located in Los Angeles, California. We assumed $140.5 million of the noncontrolling interest partner’s share of existing non-recourse property-level debt and paid $311.0 million in cash consideration, which was funded by short term borrowings. We now own all of the interests in the Palazzo joint venture and its underlying apartment communities. Prior to the transaction, we consolidated into our financial statements the joint venture and underlying apartment communities, therefore this transaction has been accounted for as an equity transaction. In accordance with GAAP, we recognized the $155.6 million of consideration paid in excess of the noncontrolling interest balance as a reduction of additional paid-in capital within Aimco’s equity and the Aimco Operating Partnership’s partners’ capital. Acquisitions of Apartment Communities During the year ended December 31, 2016 , we purchased a 463 -apartment community in Redwood City, California that was in the final stages of construction at the time of acquisition. At closing, we paid $303.0 million in cash and issued $17.0 million of 6.0% Class Ten preferred OP Units to the seller. The purchase price, plus $1.8 million of capitalized transaction costs, was allocated as follows: $26.9 million to land; $292.7 million to buildings and improvements (including construction in progress); and $2.2 million to furniture and fixtures. In February 2018, we purchased a 748 -apartment home community in Fairfax County, Virginia for $160.0 million . Based on the timing of this acquisition, we have not completed our purchase price allocation. Dispositions of Apartment Communities and Assets Held for Sale Summarized information regarding apartment communities sold during the years ended December 31, 2017 , 2016 and 2015 is set forth in the table below (dollars in thousands): 2017 2016 2015 Real Estate portfolio: Apartment communities sold 5 7 11 Apartment homes sold 2,291 3,045 3,855 Gain on disposition, net of tax 297,944 377,280 180,593 Consolidated partnerships served by the Asset Management business: Apartment communities sold 2 1 — Apartment homes sold 252 296 — Gain on disposition, net of tax 1,615 16,510 — The apartment communities sold from our Real Estate portfolio during 2017 , 2016 and 2015 were predominantly located outside of our primary markets or in lower-rated locations within our primary markets and had average revenues per apartment home significantly below those of our retained portfolio. In January 2018, we agreed to sell our interests in the entities owning the La Jolla Cove property in settlement of legal actions filed in 2014 by a group of disappointed buyers who had hoped to acquire the property. As a result of the settlement, we recognized in our 2017 results of operations a gross impairment loss of $35.8 million , $25.6 million of which relates to the establishment of a deferred tax liability assumed in connection with our acquisition of the business entities. Upon closing of the transaction, the tax liability will be assumed by the buyer, resulting in no economic loss to Aimco. In addition to the apartment communities we sold during the periods presented, from time to time we may be marketing for sale certain apartment communities that are inconsistent with our long-term investment strategy. At the end of each reporting period, we evaluate whether such communities meet the criteria to be classified as held for sale. As of December 31, 2017 , we had three apartment communities with 513 apartment homes in our Real Estate portfolio that were classified as held for sale. In January 2018, we sold these apartment homes for a gain on disposition of $51.0 million , net of tax, and gross proceeds of $71.9 million resulting in $64.6 million of net proceeds to Aimco. Proceeds from the sales were primarily used to repay outstanding borrowings under our Credit Agreement. Napico Disposition In 2012, we sold the Napico business. The transaction was primarily seller-financed, and the associated notes were scheduled to be repaid from the operation and liquidation of the Napico business and were collateralized by the buyer’s interests in the portfolio. During 2016 , the buyer paid in full the seller-financed notes as well as an agreed upon final payment representing future contingent consideration that may have been due under the terms of the sale. As a result, we derecognized the net assets and liabilities of the Napico business with the exception of the amounts related to one community in which we had continuing involvement in the form of a legal interest in the community and a guarantee related to property-level debt. We recognized a gain of $5.2 million in other, net on our consolidated statement of operations for the year ended December 31, 2016 . We also wrote off a deficit balance in noncontrolling interests in consolidated real estate partnerships associated with the Napico business of $8.1 million , which is recorded in net income attributable to noncontrolling interests in consolidated real estate partnerships for the year ended December 31, 2016 . In 2017, the owner refinanced the mortgage related to the final community, resulting in the release of our remaining guarantee, which allowed us to transfer the nominal general partner interest in the community to the buyer. In connection with the transfer, we reduced other assets and accrued liabilities and other by $34.5 million and $38.4 million , respectively, and recognized a gain of $7.1 million , net of tax, in other, net in our consolidated financial statements for the year ended December 31, 2017 .

Non-Recourse Property Debt and

Non-Recourse Property Debt and Credit Agreement	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Non-Recourse Property Debt and Credit Agreement	Non-Recourse Property Debt and Credit Agreement Non-Recourse Property Debt (Real Estate Portfolio) We finance apartment communities in our Real Estate portfolio primarily using property-level, non-recourse, long-dated, fixed-rate, amortizing debt. The following table summarizes non-recourse property debt related to assets classified as held for use at December 31, 2017 and 2016 (in thousands): 2017 2016 Fixed-rate property debt $ 3,480,378 $ 3,564,979 Variable-rate property debt 82,663 83,644 Debt issue costs, net of accumulated amortization (17,932 ) (18,347 ) Non-recourse property debt, net $ 3,545,109 $ 3,630,276 Fixed-rate property debt matures at various dates through January 2055 , and has interest rates that range from 2.73% to 8.05% , with a weighted average interest rate of 4.64% . Principal and interest on fixed-rate debt are generally payable monthly or in monthly interest-only payments with balloon payments due at maturity. At December 31, 2017 , each of the fixed-rate loans payable related to apartment communities classified as held for use were secured by one of 98 apartment communities that had an aggregate gross book value of $6.3 billion . Variable-rate property debt matures at various dates through July 2033 , and had interest rates that ranged from 1.00% to 3.06% , as of December 31, 2017 , with a weighted average interest rate of 2.70% at December 31, 2017 . Principal and interest on variable-rate debt are generally payable in semi-annual installments with balloon payments due at maturity. As of December 31, 2017 , our variable-rate property debt related to apartment communities classified as held for use were each secured by seven apartment communities that had an aggregate gross book value of $204.2 million . These non-recourse property debt instruments contain covenants common to the type of borrowing, and at December 31, 2017 , we were in compliance with all such covenants. As of December 31, 2017 , the scheduled principal amortization and maturity payments for the non-recourse property debt related to apartment communities classified as held for use were as follows (in thousands): Amortization Maturities 2018 $ 74,807 $ 173,733 2019 71,792 481,136 2020 65,362 296,967 2021 49,542 741,523 2022 39,778 233,439 Thereafter 1,334,962 Total $ 3,563,041 Credit Agreement We have a senior secured credit agreement with a syndicate of financial institutions, which we refer to as the Credit Agreement. Our Credit Agreement provides for $600.0 million of revolving loan commitments. Borrowings against the revolving loan commitments bear interest at a rate set forth on a pricing grid, which rate varies based on our credit rating as assigned by specified rating agencies ( LIBOR plus 1.20%, or, at our option, a base rate plus 0.20% at December 31, 2017 ). The Credit Agreement matures on January 22, 2022 . The Credit Agreement provides that we may make distributions to our investors during any four consecutive quarters in an aggregate amount that does not exceed the greater of 95% of our Funds From Operations for such period, subject to certain non-cash adjustments, or such amount as may be necessary to maintain Aimco’s REIT status . During 2017, we amended the Credit Agreement to add a $250.0 million term loan, which we used to fund a portion of the reacquisition of our limited partner’s interest in the Palazzo joint venture. The term loan matures on June 30, 2018 , includes a one -year extension option, subject to the satisfaction of customary conditions, and bears interest at 30-day LIBOR plus 1.35% . We paid lender and other fees of $1.0 million in connection with the term loan, which have been deferred and are amortized as additional interest using the effective interest method. As of December 31, 2017 and 2016 , we had $67.2 million and $17.9 million of outstanding borrowings under our revolving loan commitments, respectively. The interest rate on our outstanding borrowings was 3.26% and 2.09% at December 31, 2017 and 2016 , respectively. As of December 31, 2017 , after outstanding borrowings and $11.5 million of undrawn letters of credit backed by the Credit Agreement, our available borrowing capacity was $521.3 million . Non-Recourse Property Debt (Asset Management Business) The partnerships served by the Asset Management business finance apartment communities using property-level, non-recourse, long-dated, fixed-rate, amortizing debt. The following table summarizes non-recourse property debt related to assets classified as held for use at December 31, 2017 and 2016 (in thousands): 2017 2016 Fixed-rate property debt 231,374 241,024 Debt issue costs, net of accumulated amortization (4,233 ) (4,598 ) Non-recourse property debt, net $ 227,141 $ 236,426 Fixed-rate property debt secured by these communities matures at various dates through February 2061 , and has interest rates that range from 2.50% to 8.50% , with a weighted average interest rate of 5.11% . At December 31, 2017 , each of the fixed-rate loans payable related to apartment communities classified as held for use were secured by one of 39 apartment communities that had an aggregate gross book value of $551.1 million . These non-recourse property debt instruments contain covenants common to the type of borrowing, and at December 31, 2017 , the partnerships served by our Asset Management business were in compliance with all such covenants. As of December 31, 2017 , the scheduled payments for the non-recourse property debt related to apartment communities classified as held for use were as follows (in thousands): Scheduled Payments 2018 $ 5,959 2019 6,192 2020 9,317 2021 17,090 2022 4,714 Thereafter 188,102 Total $ 231,374

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments In connection with our redevelopment, development and capital improvement activities, we have entered into various construction-related contracts and we have made commitments to complete redevelopment of certain apartment communities, pursuant to financing or other arrangements. As of December 31, 2017 , our commitments related to these capital activities totaled approximately $91.1 million , most of which we expect to incur during the next 12 months. We enter into certain commitments for future purchases of goods and services in connection with the operations of our apartment communities. Those commitments generally have terms of one year or less and reflect expenditure levels comparable to our historical expenditures. Tax Credit Arrangements For various consolidated partnerships served by our Asset Management business, we are required to manage the partnerships and related apartment communities in compliance with various laws, regulations and contractual provisions that apply to historic and low-income housing tax credit syndication arrangements. In some instances, noncompliance with applicable requirements could result in projected tax benefits not being realized by the limited partners in these partnerships and would require a refund or reduction of investor capital contributions, which are reported as deferred income in our consolidated balance sheets until such time as our obligation to deliver tax benefits is relieved. The remaining compliance periods for the tax credit syndication arrangements range from less than one year to eight years . We do not anticipate that any material refunds or reductions of investor capital contributions will be required in connection with these arrangements. Legal Matters In addition to the matters described below, we are a party to various legal actions and administrative proceedings arising in the ordinary course of business, some of which are covered by our general liability insurance program, and none of which we expect to have a material adverse effect on our consolidated financial condition, results of operations or cash flows. Environmental Various federal, state and local laws subject apartment community owners or operators to liability for management, and the costs of removal or remediation, of certain potentially hazardous materials that may be present in the land or buildings of an apartment community. Such laws often impose liability without regard to fault or whether the owner or operator knew of, or was responsible for, the presence of such materials. The presence of, or the failure to manage or remediate properly, these materials may adversely affect occupancy at such apartment communities as well as the ability to sell or finance such apartment communities. In addition, governmental agencies may bring claims for costs associated with investigation and remediation actions. Moreover, private plaintiffs may potentially make claims for investigation and remediation costs they incur or for personal injury, disease, disability or other infirmities related to the alleged presence of hazardous materials. In addition to potential environmental liabilities or costs associated with our current apartment communities, we may also be responsible for such liabilities or costs associated with communities we acquire or manage in the future, or apartment communities we no longer own or operate. We are engaged in discussions with the Environmental Protection Agency, or EPA, and the Indiana Department of Environmental Management, or IDEM, regarding contaminated groundwater in a residential area in the vicinity of an Indiana apartment community that has not been owned by us since 2008. The contamination allegedly derives from a dry cleaner that operated on our former property, prior to our ownership. We have undertaken a voluntary remediation of the dry cleaner contamination under IDEM’s oversight, and in previous years accrued our share of the then-estimated cleanup and abatement costs. In 2016, EPA listed our former community and a number of residential communities in the vicinity on the National Priorities List, or NPL (i.e. as a Superfund site), and IDEM has formally sought to terminate us from the voluntary remediation program. We continue discussions with both agencies on potential long-term solutions. We have filed a formal appeal of the EPA listing and the IDEM termination of us from the voluntary remediation program. Although the outcome of these processes are uncertain, we do not expect their resolution to have a material adverse effect on our consolidated financial condition, results of operations or cash flows. We also have been contacted by regulators and the current owner of a property in Lake Tahoe, California regarding environmental issues allegedly stemming from the historic operation of a dry cleaner. An entity owned by us was the former general partner of a now-dissolved partnership that previously owned a site that was used for dry cleaning. That entity and the current property owner have been remediating the dry cleaner site since 2009, under the oversight of the Lahontan Regional Water Quality Control Board, or Lahontan. In May 2017, Lahontan issued a final cleanup and abatement order that names four potentially-responsible parties, acknowledges that there may be additional responsible parties, and requires the named parties to perform additional groundwater investigation and corrective actions with respect to onsite and offsite contamination. We are appealing the final order while simultaneously complying with it. Although the outcome of this process is uncertain, we do not expect its resolution to have a material adverse effect on our consolidated financial condition, results of operations or cash flows. We have determined that our legal obligations to remove or remediate certain potentially hazardous materials may be conditional asset retirement obligations, as defined in GAAP. Except in limited circumstances where the asset retirement activities are expected to be performed in connection with a planned construction project or apartment community casualty, we believe that the fair value of our asset retirement obligations cannot be reasonably estimated due to significant uncertainties in the timing and manner of settlement of those obligations. Asset retirement obligations that are reasonably estimable as of December 31, 2017 , are immaterial to our consolidated financial condition, results of operations and cash flows. Operating Leases We are obligated under non-cancelable operating leases for office space. We are also obligated under non-cancelable operating leases for the ground under certain of our apartment communities with remaining terms ranging from 46 years to 70 years . Approximate minimum annual rental payments under operating leases are as follows (in thousands): Office Lease Obligations Ground Lease Obligations Total Operating Lease Obligations 2018 $ 2,203 $ 1,179 $ 3,382 2019 1,050 1,279 2,329 2020 963 1,514 2,477 2021 832 1,550 2,382 2022 628 1,550 2,178 Thereafter — 79,337 79,337 Total $ 5,676 $ 86,409 $ 92,085 Substantially all of the office space subject to the operating leases in the table above is for the use of our corporate offices and area operations. Rent expense recognized totaled $3.0 million , $3.3 million and $3.2 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. Rent expense recognized for the ground leases totaled $1.8 million , $1.7 million and $0.9 million for the years ended December 31, 2017 , 2016 and 2015 , respectively, and is included within interest expense in the accompanying statements of operations.

Aimco Equity

Aimco Equity	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Aimco Equity	Aimco Equity Preferred Stock At December 31, 2017 and 2016 , Aimco had a single class of perpetual preferred stock outstanding, its Class A Cumulative Preferred Stock, with 5,000,000 shares authorized, issued and outstanding and with a balance of $125.0 million as of December 31, 2017 and 2016 . Aimco’s Class A Preferred Stock has a $0.01 per share par value, is senior to Aimco’s Common Stock, has a liquidation preference per share of $25.00 and is redeemable at our option on or after May 17, 2019 . The holders of Preferred Stock are generally not entitled to vote on matters submitted to stockholders. Dividends at an annual rate of 6.88% are subject to declaration by Aimco’s Board of Directors. During the year ended December 31, 2016 , Aimco redeemed all of the outstanding shares of its Class Z Cumulative Preferred Stock at a redemption value of $34.8 million . We reflected the $0.7 million excess of the redemption value over the carrying amount and $1.3 million of previously deferred issuance costs as an adjustment of net income attributable to preferred stockholders for the year ended December 31, 2016 . During the year ended December 31, 2015 , Aimco redeemed the remaining outstanding shares, or $27.0 million in liquidation preference, of its Series A Community Reinvestment Act, or CRA, Preferred Stock. We reflected $0.7 million of issuance costs as an adjustment of net income attributable to preferred stockholders for the year ended December 31, 2015 . In connection with these redemptions of Aimco preferred stock, the Aimco Operating Partnership redeemed from Aimco a number of Partnership Preferred Units equal to the number of shares redeemed or repurchased by Aimco. Common Stock During the years ended December 31, 2017 , 2016 and 2015 , Aimco declared dividends per common share of $1.44 , $1.32 and $1.18 , respectively. During the year ended December 31, 2015 , Aimco issued 9,430,000 shares of its Common Stock, par value $0.01 per share, in an underwritten public offering, for net proceeds per share of $38.90 . The offering generated net proceeds to Aimco of $366.6 million , net of issuance costs. Aimco contributed the net proceeds from the sale of Common Stock to the Aimco Operating Partnership in exchange for a number of common partnership units equal to the number of shares of Common Stock issued. Registration Statements Aimco and the Aimco Operating Partnership have a shelf registration statement that provides for the issuance of debt and equity securities by Aimco and debt securities by the Aimco Operating Partnership.

Partners' Capital

Partners' Capital	12 Months Ended
	Dec. 31, 2017
Partners' Capital [Abstract]
Partners' Capital	Partners’ Capital Partnership Preferred Units Owned by Aimco At December 31, 2017 and 2016 , the Aimco Operating Partnership had outstanding preferred units in classes and amounts similar to Aimco’s Preferred Stock described in Note 6 , or Partnership Preferred Units. All of these Partnership Preferred Units were owned by Aimco during the periods presented. The Partnership Preferred Units are senior to the Aimco Operating Partnership’s common partnership units. The Partnership Preferred Units do not have voting rights, except the right to approve certain changes to the Aimco Operating Partnership’s Partnership Agreement that would adversely affect holders of such class of units. Distributions on Partnership Preferred Units are subject to being declared by the General Partner. The Partnership Preferred Units are redeemable by the Aimco Operating Partnership only in connection with a concurrent redemption by Aimco of the corresponding Aimco Preferred Stock held by unrelated parties. As discussed in Note 6 , during the years ended December 31, 2016 and 2015 , Aimco completed various Preferred Stock redemptions. In connection with these redemptions, the Aimco Operating Partnership redeemed from Aimco a corresponding number of Partnership Preferred Units. Redeemable Preferred OP Units In addition to the Partnership Preferred Units owned by Aimco, the Aimco Operating Partnership has outstanding various classes of redeemable Partnership Preferred Units owned by third parties, which we refer to as preferred OP Units. As of December 31, 2017 and 2016 , the Aimco Operating Partnership had the following classes of preferred OP Units (stated at their redemption values, in thousands, except unit and per unit data): Distributions per Annum Units Issued and Outstanding Redemption Values Class of Preferred Units Percent Per Unit 2017 2016 2017 2016 Class One 8.75 % $ 8.00 90,000 90,000 $ 8,229 $ 8,229 Class Two 1.92 % $ 0.48 17,750 17,750 444 444 Class Three 7.88 % $ 1.97 1,338,524 1,341,289 33,462 33,532 Class Four 8.00 % $ 2.00 644,954 644,954 16,124 16,124 Class Six 8.50 % $ 2.13 780,036 780,036 19,501 19,501 Class Seven 7.87 % $ 1.97 27,960 27,960 699 699 Class Nine 6.00 % $ 1.50 243,112 306,890 6,078 7,672 Class Ten 6.00 % $ 1.50 680,000 680,000 17,000 17,000 Total 3,822,336 3,888,879 $ 101,537 $ 103,201 Each class of preferred OP Units is currently redeemable at the holders’ option. The Aimco Operating Partnership, at its sole discretion, may settle such redemption requests in cash or cause Aimco to issue shares of its Common Stock with a value equal to the redemption price. In the event the Aimco Operating Partnership requires Aimco to issue shares of Common Stock to settle a redemption request, the Aimco Operating Partnership would issue to Aimco a corresponding number of common partnership units. The Aimco Operating Partnership has a redemption policy that requires cash settlement of redemption requests for the preferred OP Units, subject to limited exceptions. Subject to certain conditions, the Class Four and Class Six preferred OP Units may be converted into common OP Units. These redeemable units are classified within temporary equity in Aimco’s consolidated balance sheets and within temporary capital in the Aimco Operating Partnership’s consolidated balance sheets. During the years ended December 31, 2017 , 2016 and 2015 , approximately 67,000 , 69,000 and 700 preferred OP Units, respectively, were redeemed in exchange for cash, and no preferred OP Units were redeemed in exchange for shares of Aimco Common Stock. The Class Ten preferred OP Units were issued as partial consideration for an acquisition during the year ended December 31, 2016. The following table presents a reconciliation of the Aimco Operating Partnership’s preferred OP Units during the years ended December 31, 2017 , 2016 and 2015 (dollars in thousands): 2017 2016 2015 Balance at January 1 $ 103,201 $ 87,926 $ 87,937 Preferred distributions (7,764 ) (7,239 ) (6,943 ) Redemption of preferred units and other (1,664 ) (1,725 ) (11 ) Issuance of preferred units — 17,000 — Net income 7,764 7,239 6,943 Balance at December 31 $ 101,537 $ 103,201 $ 87,926 Common Partnership Units In the Aimco Operating Partnership’s consolidated balance sheets, the common partnership units held by Aimco are classified within Partners’ Capital as General Partner and Special Limited Partner capital and the common OP Units are classified within Limited Partners’ capital. In Aimco’s consolidated balance sheets, the common OP Units are classified within permanent equity as common noncontrolling interests in the Aimco Operating Partnership. Common partnership units held by Aimco are not redeemable whereas common OP Units are redeemable at the holders’ option, subject to certain restrictions, on the basis of one common OP Unit for either one share of Common Stock or cash equal to the fair value of a share of Common Stock at the time of redemption. Aimco has the option to deliver shares of Common Stock in exchange for all or any portion of the common OP Units tendered for redemption. When a limited partner redeems a common OP Unit for Common Stock, Limited Partners’ capital is reduced and the General Partner and Special Limited Partners’ capital is increased. The holders of the common OP Units receive distributions, prorated from the date of issuance, in an amount equivalent to the dividends paid to holders of Common Stock. During the years ended December 31, 2017 , 2016 and 2015 , the Aimco Operating Partnership declared distributions per common unit of $1.44 , $1.32 and $1.18 , respectively. During the years ended December 31, 2017 , 2016 and 2015 , approximately 98,000 , 248,000 and 112,000 common OP Units, respectively, were redeemed in exchange for cash, and no common OP Units were redeemed in exchange for shares of Common Stock.

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation and Employee Benefit Plans	Share-Based Compensation We have a stock award and incentive program to attract and retain officers and independent directors. As of December 31, 2017 , approximately 0.4 million shares were available for issuance under our 2015 Stock Award and Incentive Plan. The total number of shares available for issuance under this plan may be increased by an additional 0.7 million shares to the extent of any forfeiture, cancellation, exchange, surrender, termination or expiration of an award outstanding under our 2007 Stock Award and Incentive Plan. Awards under the 2015 plan may be in the form of incentive stock options, non-qualified stock options and restricted stock, or other types of awards as authorized under the plan. Our plans are administered by the Compensation and Human Resources Committee of Aimco’s Board of Directors. In the case of stock options, the exercise price of the options granted may not be less than the fair market value of a share of Common Stock at the date of grant. Total compensation cost recognized for stock based awards was $9.3 million , $8.6 million and $7.2 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. Of these amounts, $1.4 million , $1.0 million and $0.5 million , respectively, were capitalized. At December 31, 2017 , total unvested compensation cost not yet recognized was $11.8 million . We expect to recognize this compensation over a weighted average period of approximately 1.6 years . We have granted five different types of awards that are outstanding as of December 31, 2017 . We have granted stock options and restricted stock awards that are subject to time-based vesting and require continuous employment, typically over a period of four years from the grant date, and we refer to these awards as Time-Based Stock Options and Time-Based Restricted Stock, respectively. We have also granted stock options, restricted stock awards and long-term incentive partnership units, or LTIP units, that vest conditioned on Aimco’s total shareholder return, or TSR, relative to the NAREIT Apartment Index ( 60% weighting) and the MSCI US REIT Index ( 40% weighting) over a forward-looking performance period of three years . We refer to these awards as TSR Stock Options, TSR Restricted Stock and TSR LTIP units. Earned TSR-based awards, if any, will vest 50% on each of the third anniversary and fourth anniversary of the grant date, based on continued employment. The term of Time-Based Stock Options and TSR Stock Options is generally ten years from the date of grant. We recognize compensation cost associated with Time-Based awards ratably over the requisite service periods, which are typically four years . We recognize compensation cost related to the TSR-based awards, which have graded vesting periods, over the requisite service period for each separate vesting tranche of the award, commencing on the grant date. The value of the TSR-based awards take into consideration the probability that the market condition will be achieved; therefore previously recorded compensation cost is not adjusted in the event that the market condition is not achieved and awards do not vest. Stock Options During the years ended December 31, 2017 and 2016 , we granted TSR Stock Options, and during and prior to the year ended December 31, 2015, we granted Time-Based Stock Options. The following table summarizes activity for our outstanding stock options, for the years ended December 31, 2017 , 2016 and 2015 (numbers of options in thousands): 2017 2016 2015 Number of Options Weighted Number of Options Weighted Number of Options Weighted Outstanding at beginning of year 675 $ 29.55 1,394 $ 30.85 1,640 $ 28.91 Granted 184 44.07 216 38.73 239 39.05 Exercised (211 ) 9.90 (934 ) 33.61 (484 ) 28.33 Forfeited — — (1 ) 29.11 (1 ) 25.78 Outstanding at end of year 648 $ 40.08 675 $ 29.55 1,394 $ 30.85 Exercisable at end of year 128 $ 37.59 280 $ 16.38 1,155 $ 29.16 The intrinsic value of a stock option represents the amount by which the current price of the underlying stock exceeds the exercise price of the option. As of December 31, 2017 , options outstanding had an aggregate intrinsic value of $2.4 million and a weighted average remaining contractual term of 7.9 years . Options exercisable at December 31, 2017 , had an aggregate intrinsic value of $0.8 million and a weighted average remaining contractual term of 6.7 years . The intrinsic value of stock options exercised during the years ended December 31, 2017 , 2016 and 2015 , was $7.1 million , $11.1 million and $5.5 million , respectively. The weighted average grant date fair value of stock options granted during the years ended December 31, 2017 , 2016 and 2015 was $11.39 , $9.94 and $6.97 per option, respectively. Time-Based Restricted Stock Awards The following table summarizes activity for Time-Based Restricted Stock awards for the years ended December 31, 2017 , 2016 and 2015 (numbers of shares in thousands): 2017 2016 2015 Number of Shares Weighted Number of Shares Weighted Number of Shares Weighted Unvested at beginning of year 249 $ 33.61 339 $ 29.96 513 $ 26.34 Granted 45 44.07 91 40.03 145 39.39 Vested (134 ) 32.35 (181 ) 29.99 (259 ) 27.54 Forfeited — — — — (60 ) 32.29 Unvested at end of year 160 $ 37.63 249 $ 33.61 339 $ 29.96 The aggregate fair value of shares that vested during the years ended December 31, 2017 , 2016 and 2015 was $6.0 million , $7.0 million and $10.4 million , respectively. TSR Restricted Stock Awards The following table summarizes activity for TSR Restricted Stock awards for the years ended December 31, 2017 , 2016 and 2015 (numbers of shares in thousands): 2017 2016 2015 Number of Shares Weighted Number of Shares Weighted Number of Shares Weighted Unvested at beginning of year 214 $ 39.66 123 $ 39.72 — $ — Granted 39 46.39 91 39.59 142 39.72 Forfeited — — — — (19 ) 39.72 Unvested at end of year 253 $ 40.70 214 $ 39.66 123 $ 39.72 TSR LTIP Units The following table summarizes activity for TSR LTIP units for the years ended December 31, 2017 (numbers of units in thousands): 2017 Number of Units Weighted Unvested at beginning of year — $ — Granted 45 46.21 Unvested at end of year 45 $ 46.21 Determination of Grant-Date Fair Value of Awards We estimated the fair value of TSR-based awards granted in 2017 , 2016 and 2015 using a Monte Carlo model using the assumptions set forth in the table below. The risk-free interest rate reflects the annualized yield of a zero coupon U.S. Treasury security with a term equal to the expected term of the option. The expected dividend yield reflects expectations regarding cash dividend amounts per share paid on Aimco’s Common Stock during the expected term of the option. Expected volatility reflects an average of the historical volatility of Aimco’s Common Stock during the historical period commensurate with the expected term of the options that ended on the date of grant, and the implied volatility is calculated from observed call option contracts closest to the expected term. The derived vesting period of TSR Restricted Stock and TSR LTIP units was determined based on the graded vesting terms. The expected term of the TSR-options was based on historical option exercises and post-vesting terminations. The midpoints of our valuation assumptions for the 2017 , 2016 and 2015 grants were as follows: 2017 2016 2015 Grant date market value of a common share $ 44.07 $ 38.73 $ 39.05 Risk-free interest rate 1.57 % 1.15 % 1.04 % Dividend yield 3.27 % 3.41 % 2.87 % Expected volatility 21.33 % 21.24 % 19.48 % Derived vesting period of TSR Restricted Stock and TSR LTIP units 3.4 years 3.4 years 3.4 years Weighted average expected term of TSR Stock Options 5.8 years 5.8 years n/a The grant date fair value for the Time-Based Restricted Stock awards reflects the closing price of a share of Aimco common stock on the grant date.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Deferred income taxes reflect the net effects of temporary differences between the carrying amounts of assets and liabilities of the TRS entities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred tax liabilities and assets are as follows (in thousands): December 31, 2017 2016 Deferred tax liabilities: Real estate and real estate partnership basis differences $ 32,032 $ 72,726 Deferred tax assets: Net operating, capital and other loss carryforwards $ 9,523 $ 8,873 Accruals and expenses 6,575 7,537 Tax credit carryforwards 73,450 65,559 Management contracts and other 200 300 Total deferred tax assets 89,748 82,269 Valuation allowance (25,489 ) (4,467 ) Net deferred tax assets $ 32,227 $ 5,076 In December 2017, the U.S. Congress passed the Tax Cuts and Jobs Act, or the 2017 Act, which is effective for years beginning with 2018. The 2017 Act provides for a reduction in the federal income tax rate. In accordance with GAAP, we revalued our deferred tax assets and liabilities as of December 31, 2017. We have not completed our accounting for the tax effects of enactment of the 2017 Act; however, we have made a reasonable estimate of the effects on our existing deferred tax balances, resulting in our recognition of a net tax benefit of $15.9 million . At December 31, 2017 , we had federal and state net operating loss carryforwards, or NOLs, for which the deferred tax asset was approximately $9.5 million , before a valuation allowance of $6.6 million . The NOLs expire in years 2018 to 2033 . Subject to certain separate return limitations, we may use these NOLs to offset a portion of state taxable income generated by our TRS entities. As of December 31, 2017 , we had low-income housing and rehabilitation tax credit carryforwards and corresponding deferred tax assets of approximately $73.5 million for income tax purposes that expire in years 2024 to 2037 . In light of the lower federal tax rate under the 2017 Act, our TRS entities must generate more taxable income in future years to utilize tax credit carryforwards, which are recorded as deferred tax assets. As a result, during the year ended December 31, 2017, we recognized a partial valuation allowance of $15.4 million against the deferred tax assets associated with low-income housing and rehabilitation tax credit carryforwards. At December 31, 2017 , we had a real estate partnership basis difference of $4.4 million related to the 2017 impairment loss recognized related to the La Jolla Cove property discussed in Note 3 , for which we have recognized a full valuation allowance. A reconciliation of the beginning and ending balance of our unrecognized tax benefits is presented below (in thousands): 2017 2016 2015 Balance at January 1 $ 2,286 $ 2,897 $ 2,286 Additions (reductions) based on tax positions related to prior years 190 (611 ) 611 Balance at December 31 $ 2,476 $ 2,286 $ 2,897 Because the statute of limitations has not yet elapsed, our United States federal income tax returns for the year ended December 31, 2013 and subsequent years and certain of our State income tax returns for the year ended December 31, 2013 and subsequent years are currently subject to examination by the IRS or other taxing authorities. If recognized, the unrecognized benefit would affect the effective rate. In 2014, the IRS initiated an audit of the Aimco Operating Partnership’s 2011 and 2012 tax years. This audit remains in process as of December 31, 2017 . We do not believe the audit will have any material effect on our unrecognized tax benefits, financial condition or results of operations. Our policy is to include any interest and penalties related to income taxes within the income tax line item in our consolidated statements of operations. In accordance with the accounting requirements for stock-based compensation, we may recognize tax benefits in connection with the exercise of stock options by employees of our TRS entities and the vesting of restricted stock awards. As of December 31, 2017 , all cumulative excess tax benefits from employee stock option exercises and vested restricted stock awards had been realized. As further discussed in the Accounting Pronouncements Adopted in the Current Year heading in Note 2 , in 2017 we began recognizing the tax effects related to stock-based compensation through earnings in the period the compensation was recognized. Significant components of the income tax benefit or expense are as follows and are classified within income tax benefit in income before gain on dispositions and gain on dispositions of real estate, net of tax, in our consolidated statements of operations for the years ended December 31, 2017 , 2016 and 2015 (in thousands): 2017 2016 2015 Current: Federal (1) $ (938 ) $ 5,038 $ 1,310 State 525 2,916 1,357 Total current (413 ) 7,954 2,667 Deferred: Federal (10,908 ) (26,173 ) (27,382 ) State (3,621 ) (623 ) (1,052 ) Revaluation of deferred taxes due to change in tax rate (15,894 ) — — Total deferred (30,423 ) (26,796 ) (28,434 ) Total benefit $ (30,836 ) $ (18,842 ) $ (25,767 ) Classification: Income before gain on dispositions $ (32,126 ) $ (25,208 ) $ (27,524 ) Gain on dispositions of real estate $ 1,290 $ 6,366 $ 1,757 (1) As a result of the 2017 Act, Alternative Minimum Tax credits that are not used will be refunded before 2022, therefore in 2017 we reclassified $2.7 million in AMT credits from deferred tax assets to receivables, which is included in other assets on our consolidated balance sheet, resulting in a net current federal tax benefit. Consolidated income or loss subject to tax consists of pretax income or loss of our TRS entities and income and gains retained by the REIT. For the years ended December 31, 2017 , 2016 and 2015 , we had consolidated net loss subject to tax of $55.6 million , net income subject to tax of $109.3 million and net loss subject to tax of $31.3 million , respectively. The reconciliation of income tax attributable to operations computed at the United States statutory rate to income tax benefit is shown below (dollars in thousands): 2017 2016 2015 Amount Percent Amount Percent Amount Percent Tax (benefit) provision at United States statutory rates on consolidated income or loss subject to tax $ (19,459 ) 35.0 % $ 38,257 35.0 % $ (10,947 ) 35.0 % State income tax expense, net of federal tax (benefit) expense (1,769 ) 3.2 % 7,152 6.5 % (361 ) 1.2 % Establishment of deferred tax asset related to partnership basis difference (1) (3,501 ) 6.3 % — — % — — % Effect of permanent differences (1,629 ) 2.9 % (132 ) (0.1 )% (27 ) 0.1 % Tax effect of intercompany transactions (2) — — % (47,369 ) (43.3 )% (1,515 ) 4.8 % Tax credits (9,607 ) 17.3 % (16,750 ) (15.3 )% (13,583 ) 43.4 % Tax reform revaluation (3) (15,894 ) 28.6 % — — % — — % Increase in valuation allowance (4) 21,023 (37.8 )% — — % 666 (2.1 )% Total income tax benefit $ (30,836 ) 55.5 % $ (18,842 ) (17.2 )% $ (25,767 ) 82.4 % (1) Includes the establishment of a deferred tax asset related to partnership basis difference when it became apparent that it would reverse in the foreseeable future. This deferred tax asset is fully reserved in the valuation allowance described below. (2) 2016 and 2015 include the effect of intercompany asset transfers between the Aimco Operating Partnership and TRS entities, for which tax was deferred and recognized as the assets affected GAAP income or loss, for example, through depreciation, impairment, or upon the sale of the asset to a third-party. Effective January 1, 2017, we adopted a new accounting standard applicable to intercompany asset transfers. As a result, the accumulated unrecognized deferred tax expense associated with historical intercompany transfers was recognized as a cumulative effect adjustment through retained earnings at that time, as further described in Note 2 . (3) Reflects revaluation of deferred tax assets and liabilities using the TRS entities’ lower effective tax rates resulting from the 2017 Act. (4) Includes a $15.4 million valuation allowance against the deferred tax assets associated with rehabilitation tax credits due to the lower federal tax rate under the 2017 Act. Income taxes paid totaled approximately $7.4 million , $2.2 million and $2.0 million in the years ended December 31, 2017 , 2016 and 2015 , respectively. For income tax purposes, dividends paid to holders of Common Stock primarily consist of ordinary income, capital gains, qualified dividends and unrecaptured Section 1250 gains, or a combination thereof. For the years ended December 31, 2017 , 2016 and 2015 , dividends per share held for the entire year were estimated to be taxable as follows: 2017 2016 2015 Amount Percentage Amount Percentage Amount Percentage Ordinary income $ 0.75 51.5 % $ 0.45 34.2 % $ 0.36 30.2 % Capital gains 0.51 35.7 % 0.47 35.4 % 0.37 31.3 % Qualified dividends 0.02 1.6 % 0.13 9.9 % 0.17 14.5 % Unrecaptured Section 1250 gain 0.16 11.2 % 0.27 20.5 % 0.28 24.0 % $ 1.44 100.0 % $ 1.32 100.0 % $ 1.18 100.0 %

Earnings per Share_Unit

Earnings per Share/Unit	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings per Share/Unit	Earnings per Share/Unit Aimco and the Aimco Operating Partnership calculate basic earnings per common share and basic earnings per common unit based on the weighted average number of shares of Common Stock and common partnership units and participating securities outstanding, and calculate diluted earnings per share and diluted earnings per unit taking into consideration dilutive common stock and common partnership unit equivalents and dilutive convertible securities outstanding during the period. Our common stock equivalents and common partnership unit equivalents include options to purchase shares of Common Stock, which, if exercised, would result in Aimco’s issuance of additional shares and the Aimco Operating Partnership’s issuance to Aimco of additional common partnership units equal to the number of shares purchased under the options. These equivalents also include unvested TSR Restricted Stock awards that do not meet the definition of participating securities, which would result in the issuance of additional common shares and common partnership units equal to the number of shares that vest. The effect of these securities was dilutive for the years ended December 31, 2017 , 2016 , and 2015 , and accordingly has been included in the denominator for calculating diluted earnings per share and unit during these periods. Our Time-Based Restricted Stock awards receive dividends similar to shares of Common Stock and common partnership units prior to vesting and our TSR LTIP units receive a percentage of the distributions paid to common partnership units prior to vesting. These dividends and distributions are not forfeited in the event the awards do not vest. Therefore, the unvested restricted shares and units related to these awards are participating securities. The effect of participating securities is included in basic and diluted earnings per share and unit computations using the two-class method of allocating distributed and undistributed earnings when the two-class method is more dilutive than the treasury stock method. At December 31, 2017 , 2016 and 2015 , there were 0.2 million , 0.2 million and 0.3 million shares of unvested participating restricted securities, respectively. As discussed in Note 7 , the Aimco Operating Partnership has various classes of preferred OP Units, which may be redeemed at the holders’ option. The Aimco Operating Partnership may redeem these units for cash, or at its option, shares of Common Stock. As of December 31, 2017 , these preferred OP Units were potentially redeemable for approximately 2.3 million shares of Common Stock (based on the period end market price), or cash. The Aimco Operating Partnership has a redemption policy that requires cash settlement of redemption requests for the preferred OP Units, subject to limited exceptions. Accordingly, we have excluded these securities from earnings per share and unit computations for the periods presented above, and we expect to exclude them in future periods.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Recurring Fair Value Measurements We measure at fair value on a recurring basis our investment in the securitization trust that holds certain of our property debt, which we classify as available for sale (AFS) debt securities, and our interest rate swaps, both of which are classified within Level 2 of the GAAP fair value hierarchy. Our investments classified as AFS are presented within other assets in the accompanying consolidated balance sheets. We hold several positions in the securitization trust that pay interest currently and we also hold the first loss position in the securitization trust, which accrues interest over the term of the investment. We are accreting the discount to the $100.9 million face value of the investments into interest income using the effective interest method over the remaining expected term of the investments, which as of December 31, 2017 , was approximately 3.4 years. Our amortized cost basis for these investments, which represents the original cost adjusted for interest accretion less interest payments received, was $77.7 million and $72.5 million at December 31, 2017 and 2016 , respectively. We estimated the fair value of these investments to be $82.8 million and $76.1 million at December 31, 2017 and 2016 , respectively. We estimate the fair value of these investments using an income and market approach with primarily observable inputs, including yields and other information regarding similar types of investments, and adjusted for certain unobservable inputs specific to these investments. The fair value of the positions that pay interest currently typically moves in an inverse relationship with movements in interest rates. The fair value of the first loss position is primarily correlated to collateral quality and demand for similar subordinate commercial mortgage-backed securities. Certain consolidated partnerships served by our Asset Management business have entered into interest rate swap agreements, which limit exposure to interest rate risk on the partnerships’ debt by effectively converting the interest from a variable rate to a fixed rate. We estimate the fair value of interest rate swaps using an income approach with primarily observable inputs, including information regarding the hedged variable cash flows and forward yield curves relating to the variable interest rates on which the hedged cash flows are based. The following table sets forth a summary of changes in fair value in the interest rate swaps (in thousands): Year Ended December 31, 2017 2016 2015 Beginning balance $ (3,175 ) $ (4,938 ) $ (5,273 ) Realized (unrealized) losses included in interest expense 73 (44 ) (44 ) Realized losses on derecognition of interest rate swaps included in earnings 273 — — Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss 1,207 1,586 1,678 Unrealized (losses) gains included in equity and partners’ capital (173 ) 221 (1,299 ) Ending balance $ (1,795 ) $ (3,175 ) $ (4,938 ) Realized losses on derecognition of interest rate swaps included in earnings represents previously unrealized losses related to an interest rate swap to which the partnership owning the final Napico property was a party. We wrote off the accumulated other comprehensive income related to this swap in conjunction with the derecognition of the property’s assets and liabilities as discussed in Note 3 . As of December 31, 2017 and 2016 , the remaining interest rate swaps, exclusive of the derecognized Napico interest rate swap, had aggregate notional amounts of $22.0 million and $22.4 million , respectively. As of December 31, 2017 , these swaps had a weighted average remaining term of 6.0 years . We have designated these interest rate swaps as cash flow hedges. The fair value of these swaps is presented within accrued liabilities and other related to the Asset Management business within our consolidated balance sheets, and we recognize any changes in the fair value as an adjustment of accumulated other comprehensive loss within equity and partners’ capital to the extent of their effectiveness. If the forward rates at December 31, 2017 , remain constant, we estimate that during the next 12 months , we would reclassify into earnings approximately $0.3 million of the unrealized losses in accumulated other comprehensive loss. If market interest rates increase above the 3.26% weighted average fixed rate under these interest rate swaps we will benefit from net cash payments due to us from our counterparty to the interest rate swaps. Fair Value Disclosures We believe that the carrying values of the consolidated amounts of cash and cash equivalents, receivables and payables approximates their fair value at December 31, 2017 and 2016 , due to their relatively short-term nature and high probability of realization. The estimated fair value of total indebtedness associated with our Real Estate portfolio was approximately $3.9 billion and $3.7 billion at December 31, 2017 and 2016 , respectively, as compared to carrying amounts of $3.9 billion and $3.6 billion , respectively. The carrying amounts of the non-recourse property debt of the consolidated partnerships served by our Asset Management business approximated its estimated fair value at December 31, 2017 and December 31, 2016 . We estimate the fair value of our consolidated debt using an income and market approach, including comparison of the contractual terms to observable and unobservable inputs such as market interest rate risk spreads, contractual interest rates, remaining periods to maturity, collateral quality and loan to value ratios on similarly encumbered apartment communities within our portfolio. We classify the fair value of our consolidated debt within Level 3 of the GAAP valuation hierarchy based on the significance of certain of the unobservable inputs used to estimate their fair values.

Business Segments

Business Segments	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Business Segments	Business Segments During the year ended December 31, 2017 , we revised the information regularly reviewed by our chief executive officer, who is our chief operating decision maker, to assess our operating performance. Apartment communities are classified as either part of our Real Estate portfolio or as those owned by partnerships served by our Asset Management business. Our chief operating decision maker uses proportionate property net operating income to assess the operating performance of our apartment communities. Proportionate property net operating income reflects our share of rental and other property revenues less direct property operating expenses, including real estate taxes, for consolidated apartment communities we own and manage. As of December 31, 2017 , for segment performance evaluation, our Real Estate segment included 132 consolidated apartment communities with 36,762 apartment homes and excluded four apartment communities with 142 apartment homes that we neither manage nor consolidate. As of December 31, 2017 , through our Asset Management business we also held nominal ownership positions in consolidated partnerships that own 46 low-income housing tax credit apartment communities with 6,898 apartment homes. Neither the results of operations nor the assets of these partnerships and apartment communities are quantitatively material; therefore, we have one reportable segment, Real Estate. The results of operations for the years ended December 31, 2016 and 2015 , and the segment assets as of December 31, 2016 , shown below have been revised to reflect the change in our reportable segments. The following tables present the revenues, net operating income and income before gain on dispositions of our Real Estate segment on a proportionate basis (excluding amounts related to apartment communities sold or classified as held for sale as of December 31, 2017 ) for the years ended December 31, 2017 , 2016 and 2015 (in thousands): Real Estate Proportionate Adjustments (1) Corporate and Amounts Not Allocated to Reportable Segment (2) Consolidated Year Ended December 31, 2017: Rental and other property revenues attributable to Real Estate $ 854,491 $ 15,481 $ 48,176 $ 918,148 Rental and other property revenues of partnerships served by Asset Management business — — 74,046 74,046 Tax credit and transaction revenues — — 13,243 13,243 Total revenues 854,491 15,481 135,465 1,005,437 Property operating expenses attributable to Real Estate 265,186 4,887 48,866 318,939 Property operating expenses of partnerships served by Asset Management business — — 35,440 35,440 Other operating expenses not allocated to reportable segment (3) — — 457,075 457,075 Total operating expenses 265,186 4,887 541,381 811,454 Operating income 589,305 10,594 (405,916 ) 193,983 Other items included in income before gain on dispositions (4) — — (146,463 ) (146,463 ) Income before gain on dispositions $ 589,305 $ 10,594 $ (552,379 ) $ 47,520 Real Estate Proportionate Adjustments (1) Corporate and Amounts Not Allocated to Reportable Segment (2) Consolidated Year Ended December 31, 2016: Rental and other property revenues attributable to Real Estate $ 791,587 $ 28,509 $ 79,795 $ 899,891 Rental and other property revenues of partnerships served by Asset Management business — — 74,640 74,640 Tax credit and transaction revenues — — 21,323 21,323 Total revenues 791,587 28,509 175,758 995,854 Property operating expenses attributable to Real Estate 251,636 8,284 58,037 317,957 Property operating expenses of partnerships served by Asset Management business — — 36,956 36,956 Other operating expenses not allocated to reportable segment (3) — — 394,145 394,145 Total operating expenses 251,636 8,284 489,138 749,058 Operating income 539,951 20,225 (313,380 ) 246,796 Other items included in income before gain on dispositions (4) — — (157,313 ) (157,313 ) Income before gain on dispositions $ 539,951 $ 20,225 $ (470,693 ) $ 89,483 Real Estate Proportionate Adjustments (1) Corporate and Amounts Not Allocated to Reportable Segment (2) Consolidated Year Ended December 31, 2015: Rental and other property revenues attributable to Real Estate $ 737,079 $ 28,875 $ 117,066 $ 883,020 Rental and other property revenues of partnerships served by Asset Management business — — 73,934 73,934 Tax credit and transaction revenues — — 24,356 24,356 Total revenues 737,079 28,875 215,356 981,310 Property operating expenses attributable to Real Estate 240,789 8,857 74,933 324,579 Property operating expenses of partnerships served by Asset Management business — — 37,537 37,537 Other operating expenses not allocated to reportable segment (3) — — 362,979 362,979 Total operating expenses 240,789 8,857 475,449 725,095 Operating income 496,290 20,018 (260,093 ) 256,215 Other items included in income before gain on dispositions (4) — — (164,825 ) (164,825 ) Income before gain on dispositions $ 496,290 $ 20,018 $ (424,918 ) $ 91,390 (1) Represents adjustments for the noncontrolling interests in consolidated real estate partnerships’ share of the results of consolidated apartment communities in our Real Estate segment, which are included in the related consolidated amounts, but excluded from proportionate property net operating income for our segment evaluation. (2) Includes the operating results of apartment communities sold during the periods shown or held for sale at the end of the period, if any, and the operating results of apartment communities owned by consolidated partnerships served by our Asset Management business. Corporate and Amounts Not Allocated to Reportable Segment also includes property management expenses and casualty gains and losses (which are included in consolidated property operating expenses), which are property related items that are not part of our segment performance measure. (3) Other operating expenses not allocated to reportable segment consists of depreciation and amortization, general and administrative expenses and other operating expenses including provision for real estate impairment loss, which are not included in our measure of segment performance. (4) Other items included in income before gain on dispositions primarily consist of interest expense and income tax benefit. The assets of our reportable segment and the consolidated assets not allocated to our segment are as follows (in thousands): December 31, 2017 2016 Real Estate $ 5,495,069 $ 5,432,642 Corporate and other assets (1) 583,971 800,176 Total consolidated assets $ 6,079,040 $ 6,232,818 (1) Includes the assets of consolidated partnerships served by the Asset Management business and apartment communities sold or classified as held for sale as of December 31, 2017 . For the years ended December 31, 2017 , 2016 and 2015 , capital additions related to our Real Estate segment totaled $338.0 million , $321.0 million and $340.3 million , respectively.

Variable Interest Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	Variable Interest Entities Generally, a variable interest entity, or VIE, is a legal entity in which the equity investors do not have the characteristics of a controlling financial interest or the equity investors lack sufficient equity at risk for the entity to finance its activities without additional subordinated financial support. A limited partnership is considered a VIE when the majority of the limited partners unrelated to the general partner possess neither the right to remove the general partner without cause, nor certain rights to participate in the decisions that most significantly affect the financial results of the partnership. In determining whether we are the primary beneficiary of a VIE, we consider qualitative and quantitative factors, including, but not limited to: which activities most significantly impact the VIE’s economic performance and which party controls such activities; the amount and characteristics of our investment; the obligation or likelihood for us or other investors to provide financial support; and the similarity with and significance to our business activities and the business activities of the other investors. Significant judgments related to these determinations include estimates about the current and future fair values and performance of real estate held by these VIEs and general market conditions. Aimco consolidates the Aimco Operating Partnership, which is a VIE for which Aimco is the primary beneficiary. Aimco, through the Aimco Operating Partnership, consolidates all VIEs for which it is the primary beneficiary. All of the VIEs we consolidate own interests in one or more apartment communities. VIEs that own apartment communities we classify as part of our Real Estate segment are typically structured to generate a return for their partners through the operation and ultimate sale of the communities. We are the primary beneficiary in the limited partnerships in which we are the sole decision maker and have a substantial economic interest. Certain partnerships served by our Asset Management business own interests in low-income housing tax credit apartment communities that are structured to provide for the pass-through of tax credits and tax deductions to their partners and are VIEs. We hold a nominal ownership position in these partnerships, generally one percent or less. As general partner in these partnerships, we are the sole decision maker and we receive fees and other payments in return for the asset management and other services we provide and thus share in the economics of the partnerships, and as such, we are the primary beneficiary of these partnerships. The table below summarizes information regarding VIEs that are consolidated by the Aimco Operating Partnership: December 31, 2017 2016 Real Estate portfolio: VIEs with interests in apartment communities 14 17 Apartment communities held by VIEs 14 19 Apartment homes in communities held by VIEs 4,321 6,110 Consolidated partnerships served by the Asset Management business: VIEs with interests in apartment communities 49 50 Apartment communities held by VIEs 37 38 Apartment homes in communities held by VIEs 5,893 6,093 Assets of the Aimco Operating Partnership’s consolidated VIEs must first be used to settle the liabilities of such consolidated VIEs. These consolidated VIEs’ creditors do not have recourse to the general credit of the Aimco Operating Partnership. Assets and liabilities of VIEs are summarized in the table below (in thousands): December 31, 2017 2016 Real Estate portfolio: Assets Net real estate $ 529,898 $ 897,510 Cash and cash equivalents 16,111 15,877 Restricted cash 4,798 7,981 Liabilities Non-recourse property debt 412,205 725,061 Accrued liabilities and other 10,623 14,270 Consolidated partnerships served by the Asset Management business: Assets Real estate, net 215,580 235,920 Cash and cash equivalents 15,931 14,926 Restricted cash 30,107 32,542 Liabilities Non-recourse property debt 220,356 229,509 Accrued liabilities and other 20,241 16,934

Unaudited Summarized Consolidat

Unaudited Summarized Consolidated Quarterly Information	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Unaudited Summarized Consolidated Quarterly Information	Unaudited Summarized Consolidated Quarterly Information Aimco Aimco’s summarized unaudited consolidated quarterly information for the years ended December 31, 2017 and 2016 , is provided below (in thousands, except per share amounts): Quarter 2017 First Second Third Fourth Total revenues $ 246,481 $ 249,092 $ 254,635 $ 255,229 Operating income 57,789 59,706 59,205 17,283 Net income 17,155 21,591 22,144 286,189 Net income attributable to Aimco common stockholders 11,491 15,843 17,430 262,097 Net income attributable to Aimco common stockholders per common share - basic $ 0.07 $ 0.10 $ 0.11 $ 1.68 Net income attributable to Aimco common stockholders per common share - diluted $ 0.07 $ 0.10 $ 0.11 $ 1.67 Quarter 2016 First Second Third Fourth Total revenues $ 246,239 $ 251,218 $ 248,904 $ 249,493 Operating income 63,534 64,436 58,732 60,094 Net income 29,885 245,953 30,036 177,399 Net income attributable to Aimco common stockholders 23,223 221,382 11,176 162,000 Net income attributable to Aimco common stockholders per common share - basic $ 0.15 $ 1.42 $ 0.07 $ 1.04 Net income attributable to Aimco common stockholders per common share - diluted $ 0.15 $ 1.41 $ 0.07 $ 1.03 The Aimco Operating Partnership The Aimco Operating Partnership’s summarized unaudited consolidated quarterly information for the years ended December 31, 2017 and 2016 , is provided below (in thousands, except per unit amounts): Quarter 2017 First Second Third Fourth Total revenues $ 246,481 $ 249,092 $ 254,635 $ 255,229 Operating income 57,789 59,706 59,205 17,283 Net income 17,155 21,591 22,144 286,189 Net income attributable to the Partnership’s common unitholders 12,047 16,627 18,246 274,380 Net income attributable to the Partnership’s common unitholders per common unit - basic $ 0.07 $ 0.10 $ 0.11 $ 1.68 Net income attributable to the Partnership’s common unitholders per common unit - diluted $ 0.07 $ 0.10 $ 0.11 $ 1.67 Quarter 2016 First Second Third Fourth Total revenues $ 246,239 $ 251,218 $ 248,904 $ 249,493 Operating income 63,534 64,436 58,732 60,094 Net income 29,885 245,953 30,036 177,399 Net income attributable to the Partnership’s common unitholders 24,395 232,517 11,368 169,869 Net income attributable to the Partnership’s common unitholders per common unit - basic $ 0.15 $ 1.42 $ 0.07 $ 1.04 Net income attributable to the Partnership’s common unitholders per common unit - diluted $ 0.15 $ 1.41 $ 0.07 $ 1.03

Real Estate and Accumulated Dep

Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2017
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Schedule III: Real Estate and Accumulated Depreciation Disclosure	APARTMENT INVESTMENT AND MANAGEMENT COMPANY AIMCO PROPERTIES, L.P. SCHEDULE III: REAL ESTATE AND ACCUMULATED DEPRECIATION December 31, 2017 (In Thousands Except Apartment Home Data) (2) (1) Initial Cost Cost Capitalized December 31, 2017 Apartment Date Year Apartment Buildings and Subsequent to Buildings and (3) Accumulated Total Cost (4) Apartment Community Name Type Consolidated Location Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances Real Estate Segment: 100 Forest Place High Rise Dec 1997 Oak Park, IL 1987 234 $ 2,664 $ 18,815 $ 9,965 $ 2,664 $ 28,780 $ 31,444 $ (14,718 ) $ 16,726 $ — 118-122 West 23rd Street High Rise Jun 2012 New York, NY 1987 42 14,985 23,459 6,520 14,985 29,979 44,964 (7,532 ) 37,432 17,897 173 E. 90th Street High Rise May 2004 New York, NY 1910 72 12,066 4,535 7,725 12,066 12,260 24,326 (2,893 ) 21,433 6,783 182-188 Columbus Avenue Mid Rise Feb 2007 New York, NY 1910 32 19,123 3,300 5,282 19,123 8,582 27,705 (3,371 ) 24,334 14,204 1045 on the Park Apartments Homes Mid Rise Jul 2013 Atlanta, GA 2012 30 2,793 6,662 600 2,793 7,262 10,055 (1,116 ) 8,939 5,750 1582 First Avenue High Rise Mar 2005 New York, NY 1900 17 4,281 752 508 4,281 1,260 5,541 (506 ) 5,035 2,319 21 Fitzsimons Mid-Rise Aug 2014 Aurora, CO 2008 600 12,864 104,720 16,930 12,864 121,650 134,514 (13,639 ) 120,875 47,097 234 East 88th Street Mid-Rise Jan 2014 New York, NY 1900 20 2,448 4,449 755 2,448 5,204 7,652 (875 ) 6,777 3,296 236-238 East 88th Street High Rise Jan 2004 New York, NY 1900 43 8,820 2,914 2,051 8,820 4,965 13,785 (1,835 ) 11,950 11,122 237-239 Ninth Avenue High Rise Mar 2005 New York, NY 1900 36 8,495 1,866 3,235 8,495 5,101 13,596 (2,428 ) 11,168 5,664 240 West 73rd Street, LLC High Rise Sep 2004 New York, NY 1900 200 68,109 12,140 11,586 68,109 23,726 91,835 (9,215 ) 82,620 — 2900 on First Apartments Mid Rise Oct 2008 Seattle, WA 1989 135 19,070 17,518 33,024 19,070 50,542 69,612 (21,502 ) 48,110 14,218 306 East 89th Street High Rise Jul 2004 New York, NY 1930 20 2,680 1,006 1,088 2,680 2,094 4,774 (734 ) 4,040 1,891 311 & 313 East 73rd Street Mid Rise Mar 2003 New York, NY 1904 34 5,678 1,609 417 5,678 2,026 7,704 (1,365 ) 6,339 3,993 322-324 East 61st Street High Rise Mar 2005 New York, NY 1900 40 6,372 2,224 1,476 6,372 3,700 10,072 (1,618 ) 8,454 3,478 3400 Avenue of the Arts Mid Rise Mar 2002 Costa Mesa, CA 1987 770 57,241 65,506 79,189 57,241 144,695 201,936 (84,070 ) 117,866 148,926 452 East 78th Street High Rise Jan 2004 New York, NY 1900 12 1,982 608 539 1,982 1,147 3,129 (443 ) 2,686 2,600 464-466 Amsterdam & 200-210 W. 83rd Street Mid Rise Feb 2007 New York, NY 1910 71 25,553 7,101 5,641 25,553 12,742 38,295 (5,569 ) 32,726 20,933 510 East 88th Street High Rise Jan 2004 New York, NY 1900 20 3,163 1,002 599 3,163 1,601 4,764 (567 ) 4,197 2,785 514-516 East 88th Street High Rise Mar 2005 New York, NY 1900 36 6,282 2,168 1,319 6,282 3,487 9,769 (1,460 ) 8,309 3,770 518 East 88th Street Mid-Rise Jan 2014 New York, NY 1900 20 2,233 4,315 572 2,233 4,887 7,120 (868 ) 6,252 2,855 707 Leahy Garden Apr 2007 Redwood City, CA 1973 110 15,444 7,909 6,581 15,444 14,490 29,934 (6,901 ) 23,033 8,930 865 Bellevue Garden Jul 2000 Nashville, TN 1972 326 3,562 12,037 22,966 3,562 35,003 38,565 (21,942 ) 16,623 16,828 All Hallows Garden Jan 2006 San Francisco, CA 1976 157 1,338 29,770 21,530 1,338 51,300 52,638 (32,886 ) 19,752 21,512 Axiom Apartment Homes Mid Rise Apr 2015 Cambridge, MA 2015 115 — 63,612 2,006 — 65,618 65,618 (6,386 ) 59,232 33,677 Bank Lofts High Rise Apr 2001 Denver, CO 1920 125 3,525 9,045 4,425 3,525 13,470 16,995 (6,845 ) 10,150 10,722 Bay Parc High Rise Sep 2004 Miami, FL 2000 474 22,680 41,847 27,069 22,680 68,916 91,596 (18,431 ) 73,165 43,045 Bay Ridge at Nashua Garden Jan 2003 Nashua, NH 1984 412 3,262 40,713 15,881 3,262 56,594 59,856 (22,065 ) 37,791 — Bayberry Hill Estates Garden Aug 2002 Framingham, MA 1971 424 19,944 35,945 17,864 19,944 53,809 73,753 (24,945 ) 48,808 30,710 Bayview Garden Jun 2005 San Francisco, CA 1976 146 582 15,265 18,447 582 33,712 34,294 (23,433 ) 10,861 11,133 Bluffs at Pacifica, The Garden Oct 2006 Pacifica, CA 1963 64 8,108 4,132 19,367 8,108 23,499 31,607 (11,739 ) 19,868 — Boston Lofts High Rise Apr 2001 Denver, CO 1890-01-01 158 3,446 20,589 5,257 3,446 25,846 29,292 (13,192 ) 16,100 15,663 Boulder Creek Garden Jul 1994 Boulder, CO 1973 221 754 7,730 20,443 754 28,173 28,927 (18,728 ) 10,199 4,289 Broadcast Center Garden Mar 2002 Los Angeles, CA 1990 279 29,407 41,244 20,096 29,407 61,340 90,747 (28,704 ) 62,043 55,920 Broadway Lofts High Rise Sep 2012 San Diego, CA 1909 84 5,367 14,442 3,531 5,367 17,973 23,340 (3,516 ) 19,824 11,755 Burke Shire Commons Garden Mar 2001 Burke, VA 1986 360 4,867 23,617 16,505 4,867 40,122 44,989 (22,116 ) 22,873 38,703 Calhoun Beach Club High Rise Dec 1998 Minneapolis, MN 1928 332 11,708 73,334 65,235 11,708 138,569 150,277 (75,654 ) 74,623 43,292 Canyon Terrace Garden Mar 2002 Saugus, CA 1984 130 7,508 6,601 5,453 7,508 12,054 19,562 (7,037 ) 12,525 9,285 Cedar Rim Garden Apr 2000 Newcastle, WA 1980 104 761 5,218 11,587 761 16,805 17,566 (13,464 ) 4,102 6,979 Charlesbank Apartment Homes Mid Rise Sep 2013 Watertown, MA 2012 44 3,399 11,726 702 3,399 12,428 15,827 (1,897 ) 13,930 7,890 Chestnut Hall High Rise Oct 2006 Philadelphia, PA 1923 315 12,338 14,299 9,990 12,338 24,289 36,627 (11,182 ) 25,445 37,443 (2) (1) Initial Cost Cost Capitalized December 31, 2017 Apartment Date Year Apartment Buildings and Subsequent to Buildings and (3) Accumulated Total Cost (4) Apartment Community Name Type Consolidated Location Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances Chestnut Hill Village Garden Apr 2000 Philadelphia, PA 1963 821 6,469 49,316 42,678 6,469 91,994 98,463 (56,047 ) 42,416 73,566 Chimneys of Cradle Rock Garden Jun 2004 Columbia, MD 1979 198 2,040 8,108 1,005 2,040 9,113 11,153 (3,814 ) 7,339 15,021 Columbus Avenue Mid Rise Sep 2003 New York, NY 1880-01-01 59 35,527 9,450 8,604 35,527 18,054 53,581 (9,266 ) 44,315 25,778 Creekside Garden Jan 2000 Denver, CO 1974 328 3,189 12,698 6,879 3,189 19,577 22,766 (12,738 ) 10,028 11,570 Crescent at West Hollywood, The Mid Rise Mar 2002 West Hollywood, CA 1985 130 15,765 10,215 9,096 15,765 19,311 35,076 (12,693 ) 22,383 — Elm Creek Mid Rise Dec 1997 Elmhurst, IL 1987 400 8,987 30,878 31,161 8,987 62,039 71,026 (30,121 ) 40,905 52,349 Evanston Place High Rise Dec 1997 Evanston, IL 1990 190 3,232 25,546 13,094 3,232 38,640 41,872 (17,535 ) 24,337 — Farmingdale Mid Rise Oct 2000 Darien, IL 1975 240 11,763 15,174 9,514 11,763 24,688 36,451 (12,231 ) 24,220 13,774 Flamingo Towers High Rise Sep 1997 Miami Beach, FL 1960 1,305 32,427 48,808 317,464 32,427 366,272 398,699 (160,620 ) 238,079 105,371 Four Quarters Habitat Garden Jan 2006 Miami, FL 1976 336 2,379 17,199 27,711 2,379 44,910 47,289 (24,508 ) 22,781 4,624 Foxchase Garden Dec 1997 Alexandria, VA 1940 2,113 15,496 96,062 43,269 15,496 139,331 154,827 (79,714 ) 75,113 228,636 Georgetown Garden Aug 2002 Framingham, MA 1964 207 12,351 13,168 3,280 12,351 16,448 28,799 (7,575 ) 21,224 — Georgetown II Mid Rise Aug 2002 Framingham, MA 1958 72 4,577 4,057 1,642 4,577 5,699 10,276 (3,128 ) 7,148 — Heritage Park Escondido Garden Oct 2000 Escondido, CA 1986 196 1,055 7,565 2,284 1,055 9,849 10,904 (6,589 ) 4,315 6,377 Heritage Park Livermore Garden Oct 2000 Livermore, CA 1988 167 — 10,209 1,889 — 12,098 12,098 (7,854 ) 4,244 6,603 Heritage Village Anaheim Garden Oct 2000 Anaheim, CA 1986 196 1,832 8,541 1,985 1,832 10,526 12,358 (6,665 ) 5,693 7,741 Hidden Cove Garden Jul 1998 Escondido, CA 1983 334 3,043 17,616 10,386 3,043 28,002 31,045 (15,425 ) 15,620 33,765 Hidden Cove II Garden Jul 2007 Escondido, CA 1986 118 12,849 6,530 5,093 12,849 11,623 24,472 (5,362 ) 19,110 13,684 Hillcreste Garden Mar 2002 Century City, CA 1989 315 35,862 47,216 12,220 35,862 59,436 95,298 (26,131 ) 69,167 64,958 Hillmeade Garden Nov 1994 Nashville, TN 1986 288 2,872 16,070 19,270 2,872 35,340 38,212 (19,327 ) 18,885 27,866 Horizons West Apartments Mid Rise Dec 2006 Pacifica, CA 1970 78 8,887 6,377 2,298 8,887 8,675 17,562 (4,167 ) 13,395 14,046 Hunt Club Garden Sep 2000 Gaithersburg, MD 1986 336 17,859 13,149 13,136 17,859 26,285 44,144 (14,636 ) 29,508 — Hyde Park Tower High Rise Oct 2004 Chicago, IL 1990 155 4,731 14,927 11,493 4,731 26,420 31,151 (7,939 ) 23,212 12,926 Indian Oaks Garden Mar 2002 Simi Valley, CA 1986 254 24,523 15,801 8,551 24,523 24,352 48,875 (11,896 ) 36,979 28,163 Indigo High Rise Aug 2016 Redwood City, CA 2016 463 26,932 296,116 878 26,932 296,994 323,926 (14,249 ) 309,677 141,411 Island Club Garden Oct 2000 Oceanside, CA 1986 592 18,027 28,654 15,611 18,027 44,265 62,292 (28,228 ) 34,064 56,392 Key Towers High Rise Apr 2001 Alexandria, VA 1964 140 1,526 7,050 7,355 1,526 14,405 15,931 (11,077 ) 4,854 — Lakeside Garden Oct 1999 Lisle, IL 1972 568 5,840 27,937 22,369 5,840 50,306 56,146 (32,466 ) 23,680 25,709 La Salle Garden Oct 2000 San Francisco, CA 1976 145 1,866 19,567 19,145 1,866 38,712 40,578 (28,312 ) 12,266 17,052 Latrobe High Rise Jan 2003 Washington, DC 1980 175 3,459 9,103 13,498 3,459 22,601 26,060 (12,042 ) 14,018 27,356 Laurel Crossing Garden Jan 2006 San Mateo, CA 1971 418 49,474 17,756 14,730 49,474 32,486 81,960 (16,074 ) 65,886 72,788 Lincoln Place (5) Garden Oct 2004 Venice, CA 1951 795 128,332 10,439 334,559 44,197 344,998 389,195 (95,770 ) 293,425 191,039 Lodge at Chattahoochee, The Garden Oct 1999 Sandy Springs, GA 1970 312 2,335 16,370 16,477 2,335 32,847 35,182 (21,310 ) 13,872 19,775 Malibu Canyon Garden Mar 2002 Calabasas, CA 1986 698 69,834 53,438 32,597 69,834 86,035 155,869 (41,216 ) 114,653 107,643 Maple Bay Garden Dec 1999 Virginia Beach, VA 1971 414 2,597 16,141 18,032 2,597 34,173 36,770 (22,497 ) 14,273 — Mariner's Cove Garden Mar 2002 San Diego, CA 1984 500 — 66,861 9,980 — 76,841 76,841 (36,154 ) 40,687 — Meadow Creek Garden Jul 1994 Boulder, CO 1968 332 1,435 24,533 8,739 1,435 33,272 34,707 (17,699 ) 17,008 41,229 Merrill House High Rise Jan 2000 Falls Church, VA 1964 159 1,836 10,831 8,031 1,836 18,862 20,698 (10,460 ) 10,238 — Mezzo High Rise Mar 2015 Atlanta, GA 2008 94 4,292 34,178 1,039 4,292 35,217 39,509 (4,115 ) 35,394 24,002 Monterey Grove Garden Jun 2008 San Jose, CA 1999 224 34,325 21,939 7,585 34,325 29,524 63,849 (11,678 ) 52,171 — Ocean House on Prospect Mid Rise Apr 2013 La Jolla, CA 1970 53 12,528 18,805 14,936 12,528 33,741 46,269 (4,584 ) 41,685 13,191 One Canal High Rise Sep 2013 Boston, MA 2016 310 — 15,873 178,996 — 194,869 194,869 (12,378 ) 182,491 112,037 Pacific Bay Vistas (5) Garden Mar 2001 San Bruno, CA 1987 308 28,694 62,460 37,025 23,354 99,485 122,839 (28,511 ) 94,328 68,704 Pacifica Park Garden Jul 2006 Pacifica, CA 1977 104 12,970 6,579 7,766 12,970 14,345 27,315 (5,667 ) 21,648 11,195 Palazzo at Park La Brea, The Mid Rise Feb 2004 Los Angeles, CA 2002 521 48,362 125,464 40,851 48,362 166,315 214,677 (72,351 ) 142,326 170,000 Palazzo East at Park La Brea, The Mid Rise Mar 2005 Los Angeles, CA 2005 611 72,578 136,503 16,160 72,578 152,663 225,241 (66,415 ) 158,826 111,494 Parc Mosaic Garden Dec 2014 Boulder, CO 1970 140 15,300 — 11,748 15,300 11,748 27,048 — 27,048 — Park Towne Place High Rise Apr 2000 Philadelphia, PA 1959 942 10,472 47,301 303,898 10,472 351,199 361,671 (91,256 ) 270,415 — (2) (1) Initial Cost Cost Capitalized December 31, 2017 Apartment Date Year Apartment Buildings and Subsequent to Buildings and (3) Accumulated Total Cost (4) Apartment Community Name Type Consolidated Location Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances Pathfinder Village Garden Jan 2006 Fremont, CA 1973 246 19,595 14,838 14,497 19,595 29,335 48,930 (12,384 ) 36,546 38,136 Peachtree Park Garden Jan 1996 Atlanta, GA 1969 303 4,684 11,713 13,347 4,684 25,060 29,744 (15,621 ) 14,123 1,337 Plantation Gardens Garden Oct 1999 Plantation, FL 1971 372 3,773 19,443 24,563 3,773 44,006 47,779 (25,406 ) 22,373 — Post Ridge Garden Jul 2000 Nashville, TN 1972 150 1,883 6,712 5,120 1,883 11,832 13,715 (7,856 ) 5,859 5,218 Preserve at Marin Mid Rise Aug 2011 Corte Madera, CA 1964 126 18,179 30,132 83,631 18,179 113,763 131,942 (19,787 ) 112,155 37,034 Ravensworth Towers High Rise Jun 2004 Annandale, VA 1974 219 3,455 17,157 3,639 3,455 20,796 24,251 (13,849 ) 10,402 20,789 River Club,The Garden Apr 2005 Edgewater, NJ 1998 266 30,579 30,638 6,689 30,579 37,327 67,906 (15,673 ) 52,233 — Riverloft High Rise Oct 1999 Philadelphia, PA 1910 184 2,120 11,286 30,432 2,120 41,718 43,838 (21,471 ) 22,367 9,378 Rosewood Garden Mar 2002 Camarillo, CA 1976 152 12,430 8,060 4,081 12,430 12,141 24,571 (6,385 ) 18,186 16,095 Royal Crest Estates Garden Aug 2002 Warwick, RI 1972 492 22,433 24,095 4,309 22,433 28,404 50,837 (18,569 ) 32,268 — Royal Crest Estates Garden Aug 2002 Nashua, NH 1970 902 68,230 45,562 13,521 68,230 59,083 127,313 (38,506 ) 88,807 — Royal Crest Estates Garden Aug 2002 Marlborough, MA 1970 473 25,178 28,786 11,388 25,178 40,174 65,352 (24,315 ) 41,037 30,841 Royal Crest Estates Garden Aug 2002 North Andover, MA 1970 588 51,292 36,808 24,271 51,292 61,079 112,371 (32,966 ) 79,405 42,110 Savannah Trace Garden Mar 2001 Shaumburg, IL 1986 368 13,960 20,731 11,147 13,960 31,878 45,838 (15,939 ) 29,899 23,202 Saybrook Pointe Garden Dec 2014 San Jose, CA 1995 324 32,842 84,457 19,633 32,842 104,090 136,932 (9,681 ) 127,251 63,540 Shoreview Garden Oct 1999 San Francisco, CA 1976 156 1,476 19,071 20,752 1,476 39,823 41,299 (30,085 ) 11,214 18,461 Shenandoah Crossing Garden Sep 2000 Fairfax, VA 1984 640 18,200 57,198 24,350 18,200 81,548 99,748 (53,306 ) 46,442 59,748 Springwoods at Lake Ridge Garden Jul 2002 Woodbridge, VA 1984 180 5,587 7,284 3,069 5,587 10,353 15,940 (4,160 ) 11,780 — St. George Villas Garden Jan 2006 St. George, SC 1984 40 107 1,025 400 107 1,425 1,532 (1,218 ) 314 336 Sterling Apartment Homes, The Garden Oct 1999 Philadelphia, PA 1961 534 8,871 55,365 117,562 8,871 172,927 181,798 (70,455 ) 111,343 146,650 Stone Creek Club Garden Sep 2000 Germantown, MD 1984 240 13,593 9,347 7,230 13,593 16,577 30,170 (11,902 ) 18,268 — Timbers at Long Reach Apartment Homes Garden Apr 2005 Columbia, MD 1979 178 2,430 12,181 1,283 2,430 13,464 15,894 (7,340 ) 8,554 12,405 Towers Of Westchester Park, The High Rise Jan 2006 College Park, MD 1972 303 15,198 22,029 12,858 15,198 34,887 50,085 (16,965 ) 33,120 23,836 Township At Highlands Town Home Nov 1996 Centennial, CO 1985 161 1,536 9,773 8,471 1,536 18,244 19,780 (11,272 ) 8,508 13,965 Tremont Mid Rise Dec 2014 Atlanta, GA 2009 78 5,274 18,011 2,335 5,274 20,346 25,620 (2,258 ) 23,362 — Twin Lake Towers High Rise Oct 1999 Westmont, IL 1969 399 3,268 18,763 36,186 3,268 54,949 58,217 (40,894 ) 17,323 29,851 Vantage Pointe Mid Rise Aug 2002 Swampscott, MA 1987 96 4,748 10,089 1,663 4,748 11,752 16,500 (4,853 ) 11,647 3,385 Villa Del Sol Garden Mar 2002 Norwalk, CA 1972 120 7,476 4,861 4,040 7,476 8,901 16,377 (4,628 ) 11,749 10,813 Villas at Park La Brea, The Garden Mar 2002 Los Angeles, CA 2002 250 8,630 48,871 7,116 8,630 55,987 64,617 (27,703 ) 36,914 14,477 Villas of Pasadena Mid Rise Jan 2006 Pasadena, CA 1973 92 9,693 6,818 3,963 9,693 10,781 20,474 (3,740 ) 16,734 9,299 Vivo High Rise Jun 2015 Cambridge, MA 2015 91 6,450 35,974 5,089 6,450 41,063 47,513 (5,853 ) 41,660 20,796 Waterford Village Garden Aug 2002 Bridgewater, MA 1971 588 29,110 28,101 5,644 29,110 33,745 62,855 (24,149 ) 38,706 36,024 Waterways Village Garden Jun 1997 Aventura, FL 1994 180 4,504 11,064 13,340 4,504 24,404 28,908 (10,804 ) 18,104 13,456 Waverly Apartments Garden Aug 2008 Brighton, MA 1970 103 7,920 11,347 5,912 7,920 17,259 25,179 (5,740 ) 19,439 11,770 Wexford Village Garden Aug 2002 Worcester, MA 1974 264 6,349 17,939 2,595 6,349 20,534 26,883 (11,885 ) 14,998 — Willow Bend Garden May 1998 Rolling Meadows, IL 1969 328 2,717 15,437 22,524 2,717 37,961 40,678 (26,029 ) 14,649 33,838 Windrift Garden Mar 2001 Oceanside, CA 1987 404 24,960 17,590 19,948 24,960 37,538 62,498 (21,906 ) 40,592 39,408 Windsor Park Garden Mar 2001 Woodbridge, VA 1987 220 4,279 15,970 5,686 4,279 21,656 25,935 (12,356 ) 13,579 17,338 Yacht Club at Brickell High Rise Dec 2003 Miami, FL 1998 357 31,362 32,214 13,762 31,362 45,976 77,338 (15,954 ) 61,384 45,303 Yorktown Apartments High Rise Dec 1999 Lombard, IL 1971 364 3,055 18,162 50,494 3,055 68,656 71,711 (23,943 ) 47,768 29,010 Other (6) — 75,903 10,474 7,948 40,022 18,422 58,444 (6,675 ) 51,769 — Total Real Estate Segment 36,249 1,878,960 3,249,698 2,924,451 1,753,604 6,174,149 7,927,753 (2,522,358 ) 5,405,395 3,563,041 Asset Management Business: Arvada House High Rise Nov 2004 Arvada, CO 1977 88 405 3,314 2,475 405 5,789 6,194 (3,174 ) 3,020 3,806 Beacon Hill High Rise Mar 2002 Hillsdale, MI 1980 198 1,094 7,044 6,271 1,094 13,315 14,409 (7,607 ) 6,802 6,512 Biltmore Towers High Rise Mar 2002 Dayton, OH 1980 230 1,814 6,411 13,688 1,814 20,099 21,913 (14,027 ) 7,886 9,863 Butternut Creek Mid Rise Jan 2006 Charlotte, MI 1980 100 505 3,617 4,163 505 7,780 8,285 (6,461 ) 1,824 4,042 (2) (1) Initial Cost Cost Capitalized December 31, 2017 Apartment Date Year Apartment Buildings and Subsequent to Buildings and (3) Accumulated Total Cost (4) Apartment Community Name Type Consolidated Location Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances Carriage House Mid Rise Dec 2006 Petersburg, VA 1885-01-01 118 716 2,886 4,173 716 7,059 7,775 (4,390 ) 3,385 1,767 Copperwood Apartments I Garden Apr 2006 The Woodlands, TX 1980 150 383 8,373 6,182 383 14,555 14,938 (12,789 ) 2,149 4,969 Copperwood Apartments II Garden Oct 2005 The Woodlands, TX 1981 150 459 5,553 3,890 459 9,443 9,902 (6,160 ) 3,742 5,126 Country Club Heights Garden Mar 2004 Quincy, IL 1976 200 676 5,715 5,444 676 11,159 11,835 (6,957 ) 4,878 5,252 Crevenna Oaks Town Home Jan 2006 Burke, VA 1979 50 — 5,203 616 — 5,819 5,819 (3,686 ) 2,133 2,136 Fountain Place Mid Rise Jan 2006 Connersville, IN 1980 102 378 2,091 3,427 378 5,518 5,896 (2,725 ) 3,171 816 Hopkins Village Mid Rise Sep 2003 Baltimore, MD 1979 165 549 5,973 3,527 549 9,500 10,049 (4,799 ) 5,250 9,100 Ingram Square Garden Jan 2006 San Antonio, TX 1980 120 800 3,136 6,057 800 9,193 9,993 (6,468 ) 3,525 2,980 Kirkwood House High Rise Sep 2004 Baltimore, MD 1979 261 1,337 9,358 9,572 1,337 18,930 20,267 (10,453 ) 9,814 16,000 La Vista Garden Jan 2006 Concord, CA 1981 75 581 4,449 4,835 581 9,284 9,865 (4,793 ) 5,072 4,723 Loring Towers High Rise Oct 2002 Minneapolis, MN 1975 230 886 7,445 9,213 886 16,658 17,544 (9,269 ) 8,275 9,225 Loring Towers Apartments High Rise Sep 2003 Salem, MA 1973 250 187 14,050 8,738 187 22,788 22,975 (12,437 ) 10,538 9,622 New Baltimore Mid Rise Mar 2002 New Baltimore, MI 1980 101 896 2,360 5,404 896 7,764 8,660 (4,999 ) 3,661 1,887 Northpoint Garden Jan 2000 Chicago, IL 1921 304 2,510 14,334 16,358 2,510 30,692 33,202 (23,479 ) 9,723 17,170 Panorama Park Garden Mar 2002 Bakersfield, CA 1982 66 521 5,520 1,324 521 6,844 7,365 (4,299 ) 3,066 1,558 Park Place Mid Rise Jun 2005 St Louis, MO 1977 242 705 6,327 8,557 705 14,884 15,589 (11,702 ) 3,887 8,065 Parkways, The Garden Jun 2004 Chicago, IL 1925 446 3,426 23,257 23,186 3,426 46,443 49,869 (29,364 ) 20,505 14,892 Pleasant Hills Garden Apr 2005 Austin, TX 1982 100 1,229 2,631 4,322 1,229 6,953 8,182 (4,581 ) 3,601 2,841 Plummer Village Mid Rise Mar 2002 North Hills, CA 1983 75 666 2,647 1,394 666 4,041 4,707 (3,069 ) 1,638 2,226 Riverwoods High Rise Jan 2006 Kankakee, IL 1983 125 598 4,931 3,834 598 8,765 9,363 (4,467 ) 4,896 3,412 Round Barn Manor Garden Mar 2002 Champaign, IL 1979 156 810 5,134 6,086 810 11,220 12,030 (5,222 ) 6,808 3,774 San Jose Apartments Garden Sep 2005 San Antonio, TX 1970 220 234 5,770 12,543 234 18,313 18,547 (11,656 ) 6,891 4,154 San Juan Del Centro Mid Rise Sep 2005 Boulder, CO 1971 150 439 7,110 12,694 439 19,804 20,243 (12,108 ) 8,135 11,389 South Bay Villa Garden Mar 2002 Los Angeles, CA 1981 80 1,352 2,770 3,944 1,352 6,714 8,066 (5,716 ) 2,350 2,622 Summit Oaks Town Home Jan 2006 Burke, VA 1980 50 — 5,311 631 — 5,942 5,942 (3,571 ) 2,371 2,113 Tamarac Pines Apartments I Garden Nov 2004 Woodlands, TX 1980 144 363 2,775 3,828 363 6,603 6,966 (4,287 ) 2,679 3,483 Tamarac Pines Apartments II Garden Nov 2004 Woodlands, TX 1980 156 266 3,195 4,363 266 7,558 7,824 (4,863 ) 2,961 3,774 Terry Manor Mid Rise Oct 2005 Los Angeles, CA 1977 170 1,997 5,848 5,441 1,997 11,289 13,286 (9,346 ) 3,940 5,960 Tompkins Terrace Garden Oct 2002 Beacon, NY 1974 193 872 6,827 14,918 872 21,745 22,617 (12,629 ) 9,988 6,318 Van Nuys Apartments High Rise Mar 2002 Los Angeles, CA 1981 299 3,576 21,226 23,955 3,576 45,181 48,757 (23,501 ) 25,256 23,531 Walnut Hills High Rise Jan 2006 Cincinnati, OH 1983 198 820 5,608 6,000 820 11,608 12,428 (6,847 ) 5,581 4,799 Washington Square West Mid Rise Sep 2004 Philadelphia, PA 1982 132 582 11,169 5,479 582 16,648 17,230 (12,146 ) 5,084 3,298 Whitefield Place Garden Apr 2005 San Antonio, TX 1980 80 219 3,151 2,445 219 5,596 5,815 (3,681 ) 2,134 1,932 Winter Gardens High Rise Mar 2004 St Louis, MO 1920 112 300 3,072 4,973 300 8,045 8,345 (3,261 ) 5,084 3,132 Woodland Hills Garden Oct 2005 Jackson, MI 1980 125 320 3,875 4,237 320 8,112 8,432 (5,262 ) 3,170 3,105 Total Asset Management Business 6,211 33,471 249,466 268,187 33,471 517,653 551,124 (326,251 ) 224,873 231,374 Total 42,460 $ 1,912,431 $ 3,499,164 $ 3,192,638 $ 1,787,075 $ 6,691,802 $ 8,478,877 $ (2,848,609 ) $ 5,630,268 $ 3,794,415 (1) Date we acquired the apartment community or first consolidated the partnership that owns the apartment community. (2) Includes costs capitalized since acquisition or date of initial consolidation of the partnership/apartment community. (3) The aggregate cost of land and depreciable property for federal income tax purposes was approximately $3.7 billion at December 31, 2017. (4) Encumbrances are presented before reduction for debt issuance costs. (5) The current carrying value of the apartment community reflects an impairment loss recognized during prior periods. (6) Other includes land parcels and certain non-residential properties held for future development. The current carrying value of land reflects an impairment loss recognized during the current period. APARTMENT INVESTMENT AND MANAGEMENT COMPANY AIMCO PROPERTIES, L.P. SCHEDULE III: REAL ESTATE AND ACCUMULATED DEPRECIATION For the Years Ended December 31, 2017 , 2016 and 2015 (In Thousands) 2017 2016 2015 Real Estate Segment Real Estate balance at beginning of year $ 7,931,117 $ 7,744,894 $ 7,577,031 Additions during the year: Acquisitions 16,687 333,174 147,077 Capital additions 345,974 329,697 355,569 Deductions during the year: Casualty and other write-offs (1) (106,590 ) (170,744 ) (66,844 ) Impairment of real estate (35,881 ) — — Amounts related to assets held for sale (38,208 ) — (7,036 ) Sales (185,346 ) (305,904 ) (260,903 ) Real Estate balance at end of year $ 7,927,753 $ 7,931,117 $ 7,744,894 Accumulated Depreciation balance at beginning of year $ 2,421,357 $ 2,488,448 $ 2,393,292 Additions during the year: Depreciation 320,870 287,661 262,235 Deductions during the year: Casualty and other write-offs (1) (106,521 ) (169,098 ) (66,246 ) Amounts related to assets held for sale (20,383 ) — (4,427 ) Sales (92,965 ) (185,654 ) (96,406 ) Accumulated depreciation balance at end of year $ 2,522,358 $ 2,421,357 $ 2,488,448 Asset Management Business Real Estate balance at beginning of year $ 555,049 $ 562,589 $ 567,927 Additions during the year: Capital additions 8,255 8,909 7,379 Deductions during the year: Casualty and other write-offs (2) (1,711 ) (2,116 ) (12,717 ) Amounts related to assets held for sale — (2,801 ) — Sales (10,469 ) (11,532 ) — Real Estate balance at end of year $ 551,124 $ 555,049 $ 562,589 Accumulated Depreciation balance at beginning of year $ 309,401 $ 289,574 $ 278,887 Additions during the year: Depreciation 24,090 24,704 23,279 Deductions during the year: Casualty and other write-offs (2) (2,480 ) (68 ) (12,592 ) Amounts related to assets held for sale — (1,525 ) — Sales (4,760 ) (3,284 ) — Accumulated depreciation balance at end of year $ 326,251 $ 309,401 $ 289,574 (1) Includes the write-off of fully depreciated assets totaling $106.4 million , $167.9 million and $65.1 million , during the years ended December 31, 2017 , 2016 and 2015 , respectively. (2) Includes the write-off of fully depreciated assets totaling $1.8 million and $11.8 million , during the years ended December 31, 2017 and 2015 , respectively.

Basis of Presentation and Sum24

Basis of Presentation and Summary of Significant Accounting Policies - (Policies)	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principles of Consolidation	Principles of Consolidation Aimco’s accompanying consolidated financial statements include the accounts of Aimco, the Aimco Operating Partnership, and their consolidated subsidiaries. The Aimco Operating Partnership’s consolidated financial statements include the accounts of the Aimco Operating Partnership and its consolidated subsidiaries. All significant intercompany balances have been eliminated in consolidation. Interests in the Aimco Operating Partnership that are held by limited partners other than Aimco are reflected in Aimco’s accompanying balance sheets as noncontrolling interests in Aimco Operating Partnership. Interests in partnerships consolidated into the Aimco Operating Partnership that are held by third parties are reflected in our accompanying balance sheets as noncontrolling interests in consolidated real estate partnerships. The assets of real estate partnerships consolidated by the Aimco Operating Partnership must first be used to settle the liabilities of such consolidated real estate partnerships. These consolidated real estate partnerships’ creditors do not have recourse to the general credit of the Aimco Operating Partnership. As used herein, and except where the context otherwise requires, “partnership” refers to a limited partnership or a limited liability company and “partner” refers to a partner in a limited partnership or a member of a limited liability company.
Property, Plant, and Equipment	Acquisition of Real Estate and Related Depreciation and Amortization We generally recognize the acquisition of apartment communities or interests in partnerships that own apartment communities at cost. The related transaction costs are generally included in the cost of the acquired apartment community. We allocate the cost of apartment communities acquired based on the relative fair value of the assets acquired and liabilities assumed. We determine the fair value of tangible assets, such as land, buildings, furniture, fixtures and equipment, generally using valuation techniques that consider comparable market transactions, replacement costs and other available information. We determine the fair value of identified intangible assets (or liabilities), which typically relate to in-place leases, using valuation techniques that consider the terms of the in-place leases, current market data for comparable leases and our experience in leasing similar communities. The intangible assets or liabilities related to in-place leases are comprised of: (a) the value of the above- and below-market leases in-place, measured over the period, including probable lease renewals for below-market leases, that the leases are expected to remain in effect; (b) the estimated unamortized portion of avoided leasing commissions and other costs that ordinarily would be incurred to originate the in-place leases; and (c) the value associated with leased apartment homes during an estimated absorption period (estimates of rental revenue that would not have been earned had leased apartment homes been vacant at the time of acquisition assuming lease-up periods based on market demand and stabilized occupancy levels). Depreciation for all tangible assets is calculated using the straight-line method over their estimated useful lives. Acquired buildings and improvements are depreciated over a useful life based on the age, condition and other physical characteristics of the apartment community. At December 31, 2017 , the weighted average depreciable life of our buildings and improvements was approximately 28 years. Furniture, fixtures and equipment associated with apartment communities are depreciated over five years. The above- and below-market lease intangibles are amortized to rental revenue over the expected remaining terms of the associated leases, which include reasonably assured renewal periods. Other intangible assets related to in-place leases are amortized to depreciation and amortization over the expected remaining terms of the associated leases. At December 31, 2017 and 2016 , deferred income in our consolidated balance sheets included below-market lease amounts totaling $9.1 million and $10.4 million , respectively, which are net of accumulated amortization of $34.4 million and $33.1 million , respectively. During the years ended December 31, 2017 , 2016 and 2015 , we included amortization of below-market leases of $1.3 million , $1.7 million and $1.7 million , respectively, in rental and other property revenues in our consolidated statements of operations. At December 31, 2017 , our below-market leases had a weighted average amortization period of 6.2 years and estimated aggregate amortization for each of the five succeeding years as follows (in thousands): Estimated Amortization 2018 $1,128 2019 998 2020 886 2021 811 2022 763 Capital Additions and Related Depreciation We capitalize costs, including certain indirect costs, incurred in connection with our capital additions activities, including redevelopments, developments, other tangible apartment community improvements and replacements of existing apartment community components. Included in these capitalized costs are payroll costs associated with time spent by site employees in connection with capital additions activities at the apartment community level. We characterize as “indirect costs” an allocation of certain department costs, including payroll, at the area operations and corporate levels that clearly relate to capital additions activities. We also capitalize interest, property taxes and insurance during periods in which redevelopments, developments and construction projects are in progress. We begin capitalization of costs, including certain indirect costs, incurred in connection with our capital addition activities, upon commencement of activities necessary to get apartment communities ready for their intended use. These activities include when apartment communities or apartment homes are undergoing physical construction, as well as when apartment homes are held vacant in advance of planned construction, provided that other activities such as permitting, planning and design are in progress. We cease the capitalization of costs when the apartment communities are substantially complete and ready for their intended use, which is typically when construction has been completed and apartment homes are available for occupancy. Costs, including ordinary repairs, maintenance and resident turnover costs, are charged to property operating expense as incurred. We depreciate capitalized costs using the straight-line method over the estimated useful life of the related improvement, which is generally 5 , 15 or 30 years. All capitalized site payroll costs and indirect costs are allocated to capital additions proportionately, based on direct costs and depreciated over the estimated useful lives of such capital additions. Certain homogeneous items that are purchased in bulk on a recurring basis, such as carpeting and appliances, are depreciated using group methods that reflect the average estimated useful life of the items in each group. Except in the case of apartment community casualties, where the net book value of the lost asset is written off in the determination of casualty gains or losses, we generally do not recognize any loss in connection with the replacement of an existing apartment community component because normal replacements are considered in determining the estimated useful lives used in connection with our composite and group depreciation methods. For the years ended December 31, 2017 , 2016 and 2015 , we capitalized to buildings and improvements $7.6 million , $9.6 million and $11.7 million of interest costs, respectively, and $36.0 million , $32.9 million and $28.2 million of other direct and indirect costs, respectively. Impairment of Long-Lived Assets Real estate and other long-lived assets to be held and used are stated at cost, less accumulated depreciation and amortization, unless the carrying amount of the asset is not recoverable. If events or circumstances indicate that the carrying amount of an apartment community may not be recoverable, we make an assessment of its recoverability by comparing the carrying amount to our estimate of the undiscounted future cash flows, excluding interest charges, of the apartment community. If the carrying amount exceeds the aggregate undiscounted future cash flows, we recognize an impairment loss to the extent the carrying amount exceeds the estimated fair value of the apartment community.
Cash Equivalents	Cash Equivalents We classify highly liquid investments with an original maturity of three months or less as cash equivalents. We maintain cash equivalents in financial institutions in excess of insured limits. We have not experienced any losses in these accounts in the past and believe that we are not exposed to significant credit risk because our accounts are deposited with major financial institutions.
Restricted Cash	Restricted Cash Restricted cash includes capital replacement reserves, completion repair reserves, bond sinking fund amounts, tax and insurance escrow accounts held by lenders and resident security deposits.
Investments	Investments in Unconsolidated Real Estate Partnerships We own general and limited partner interests in partnerships that either directly, or through interests in other real estate partnerships, own apartment communities. We generally account for investments in real estate partnerships that we do not consolidate under the equity method. Under the equity method, we recognize our share of the earnings or losses of the entity for the periods presented, inclusive of our share of any impairments and disposition gains recognized by and related to such entities, and we present such amounts within other, net in our consolidated statements of operations. The excess of the cost of the acquired partnership interests over the historical carrying amount of partners’ equity or deficit is generally ascribed to the fair values of land and buildings owned by the partnerships. We amortize the excess cost related to the buildings over the related estimated useful lives. Such amortization is recorded as an adjustment of the amounts of earnings or losses we recognize from such unconsolidated real estate partnerships. Investments in Securitization Trust that holds Aimco Property Debt We hold investments in a securitization trust that primarily holds certain of our property debt. These investments were initially recognized at their purchase price and the discount to the face value is being accreted into interest income over the expected term of the securities. We have designated these investments as available for sale securities and we measure these investments at fair value with changes in their fair value, other than the changes attributed to the accretion described above, recognized as an adjustment of accumulated other comprehensive income or loss within equity and partners’ capital. Refer to Note 11 for further information regarding these debt securities.
Intangible Assets	Intangible Assets At December 31, 2017 and 2016 , other assets included goodwill associated with our reportable segment of $37.8 million . We perform an annual impairment test of goodwill by evaluating qualitative factors to determine the likelihood that goodwill may be impaired. We primarily consider the fair value of our real estate portfolio and the fair value of our debt relative to their carrying values. As a result of the qualitative analysis, we do not believe our goodwill is impaired as of the date of our annual test. During the years ended December 31, 2016 and 2015 , we allocated $4.5 million and $1.2 million , respectively, of goodwill related to our reportable segments to the carrying amounts of the apartment communities sold or classified as held for sale. The amounts of goodwill allocated to these apartment communities were based on the relative fair values of the apartment communities sold or classified as held for sale. As further discussed under the Accounting Pronouncements Adopted in the Current Year heading, commencing in 2017 we no longer allocate goodwill to the carrying amounts of apartment communities sold or classified as held for sale that do not meet the definition of a business.
Capitalized Software Costs	Capitalized Software Costs Purchased software and other costs related to software purchased or developed for internal use are capitalized during the application development stage and are amortized using the straight-line method over the estimated useful life of the software, generally three to five years. For the years ended December 31, 2017 , 2016 and 2015 , we capitalized software purchase and development costs totaling $2.0 million , $3.4 million and $3.6 million , respectively. At December 31, 2017 and 2016 , other assets included $9.1 million and $12.6 million of net capitalized software, respectively. During the years ended December 31, 2017 , 2016 and 2015 , we recognized amortization of capitalized software of $5.5 million , $7.2 million and $6.9 million , respectively, which is included in depreciation and amortization in our consolidated statements of operations.
Deferred Costs	Deferred Costs We defer lender fees and other direct costs incurred in obtaining new financing and amortize the amounts over the terms of the related loan agreements. Amortization of these costs is included in interest expense. Debt issue costs associated with our revolving credit facility are included in other assets on our consolidated balance sheets. Debt issue costs associated with non-recourse property debt and our term loan are presented as a direct deduction from the related liabilities on our consolidated balance sheets. We defer leasing commissions and other direct costs incurred in connection with successful leasing efforts and amortize the costs over the terms of the related leases. Amortization of these costs is included in depreciation and amortization.
Noncontrolling Interests in Consolidated Real Estate Partnerships	Noncontrolling Interests in Consolidated Real Estate Partnerships We report the unaffiliated partners’ interests in the net assets of our consolidated real estate partnerships as noncontrolling interests in consolidated real estate partnerships within consolidated equity and partners’ capital. Noncontrolling interests in consolidated real estate partnerships consist primarily of equity interests held by limited partners in consolidated real estate partnerships that have finite lives. We generally attribute to noncontrolling interests their share of income or loss of consolidated partnerships based on their proportionate interest in the results of operations of the partnerships, including their share of losses even if such attribution results in a deficit noncontrolling interest balance within our equity and partners’ capital accounts. The terms of the related partnership agreements generally require the partnerships to be liquidated following the sale of the underlying real estate. As the general partner in these partnerships, we ordinarily control the execution of real estate sales and other events that could lead to the liquidation, redemption or other settlement of noncontrolling interests. Changes in our ownership interest in consolidated real estate partnerships generally consist of our purchase of an additional interest in or the sale of our entire interest in a consolidated real estate partnership. The effect on our equity and partners’ capital of our purchase of additional interests in consolidated real estate partnerships during the years ended December 31, 2017 , 2016 and 2015 , is shown in our consolidated statements of equity and partners’ capital. The effect on our equity and partners’ capital of sales of consolidated real estate or sales of our entire interest in consolidated real estate partnerships is reflected in our consolidated financial statements as gains on disposition of real estate and accordingly the effect on our equity and partners’ capital is reflected within the amount of net income allocated to us and to noncontrolling interests. Upon our deconsolidation of a real estate partnership following the sale of our partnership interests or liquidation of the partnership following sale of the related apartment community, we derecognize any remaining noncontrolling interest of the associated partnership previously recorded in our consolidated balance sheets.
Noncontrolling Interests in Aimco Operating Partnership	Noncontrolling Interests in Aimco Operating Partnership Noncontrolling interests in Aimco Operating Partnership consist of common OP Units and preferred OP Units. Holders of preferred OP Units participate in the Aimco Operating Partnership’s income or loss only to the extent of their preferred distributions. Within Aimco’s consolidated financial statements, after provision for Preferred OP Unit distributions, the Aimco Operating Partnership’s income or loss is allocated to the holders of common partnership units based on the weighted average number of common partnership units (including those held by Aimco) outstanding during the period. During the years ended December 31, 2017 , 2016 and 2015 , the holders of common OP Units had a weighted average ownership interest in the Aimco Operating Partnership of 4.5% , 4.7% and 4.7% , respectively. See Note 7 for further information regarding the items comprising noncontrolling interests in the Aimco Operating Partnership.
Revenue Recognition	Revenue Recognition Our apartment communities have operating leases with apartment residents with terms averaging 12 months. We recognize rental revenue related to these leases, net of any concessions, on a straight-line basis over the term of the lease. We recognize revenues from asset management and other services when the related fees are earned and realized or realizable.
Asset Management Business	Asset Management Business We are the general partner in certain low-income housing tax credit partnerships, which are structured to provide for the pass-through of tax credits and deductions to their partners. The tax credits are generally realized ratably over the first ten years of the tax credit arrangement and are subject to the partnership’s compliance with applicable laws and regulations for a period of 15 years . We hold nominal ownership positions in these partnerships, generally less than one percent. At inception, each investor agreed to fund capital contributions to the partnerships and we received a syndication fee from the partnerships upon the investors’ admission to the partnership. In our role, we provide asset management and other services to these partnerships and we receive fees and other payments in return. To the extent amounts due to us are not paid currently, the balances accrue and are satisfied from the partnerships’ future operating or liquidating cash flow. Capital contributions received by the partnerships from tax credit investors represent, in substance, consideration that we receive in exchange for our obligation to deliver tax credits and other tax benefits to the investors. We record these contributions as deferred income in our consolidated balance sheets upon receipt, and we recognize these amounts as revenue in our consolidated statements of operations when our obligation to the investors is relieved upon delivery of the tax benefits. We consolidate the low-income housing tax credit partnerships in which we are the sole general partner, as further discussed in Note 13 . When the contractual arrangements obligate us to deliver tax benefits to the investors, and entitle us through fee arrangements to receive substantially all available cash flow from the partnerships, we recognize the income or loss generated by the underlying real estate based on our economic interest in the partnerships’ current period results, which is approximately 100% and represents the allocation of cash available for distribution we would receive from a hypothetical liquidation at the book value of the partnership’s net assets. Our economic interest in these partnerships will be 100% until the limited partners become entitled to an allocation of distributable cash (generally upon sale of the underlying real estate). Our economic interest generally differs from our legal interest.
Insurance	Insurance We believe our insurance coverages insure our apartment communities adequately against the risk of loss attributable to fire, earthquake, hurricane, tornado, flood and other perils. In addition, we have third-party insurance coverage (after self-insured retentions) that defray the costs of large workers’ compensation, health and general liability exposures. We accrue losses based upon our estimates of the aggregate liability for uninsured losses incurred using certain actuarial assumptions followed in the insurance industry and based on our experience.
Stock-Based Compensation	Share-Based Compensation We issue various forms of share-based compensation, including stock options and restricted stock awards with service conditions and/or market conditions. We recognize share-based employee compensation based on the fair value on the grant date and recognize compensation cost over the awards’ requisite service periods. We reduce compensation cost related to forfeited awards in the period of forfeiture. See Note 8 for further discussion of our share-based compensation.
Income Taxes	Income Taxes Aimco has elected to be taxed as a REIT under the Internal Revenue Code commencing with its taxable year ended December 31, 1994, and it intends to continue to operate in such a manner. Aimco’s current and continuing qualification as a REIT depends on its ability to meet the various requirements imposed by the Internal Revenue Code, which are related to organizational structure, distribution levels, diversity of stock ownership and certain restrictions with regard to owned assets and categories of income. If Aimco qualifies for taxation as a REIT, it will generally not be subject to United States federal corporate income tax on its taxable income that is currently distributed to stockholders. This treatment substantially eliminates the “double taxation” (at the corporate and stockholder levels) that generally results from an investment in a corporation. Even if Aimco qualifies as a REIT, it may be subject to United States federal income and excise taxes in various situations, such as on our undistributed income. Aimco also will be required to pay a 100% tax on any net income on non-arm’s length transactions between it and a TRS (described below) and on any net income from sales of apartment communities that were held for sale in the ordinary course. The state and local tax laws may not conform to the United States federal income tax treatment, and Aimco may be subject to state or local taxation in various state or local jurisdictions, including those in which we transact business. Any taxes imposed on us reduce our operating cash flow and net income. Certain of our operations or a portion thereof, including property management and risk management, are conducted through taxable REIT subsidiaries, which are subsidiaries of the Aimco Operating Partnership, and each of which we refer to as a TRS. A TRS is a subsidiary C-corporation that has not elected REIT status and as such is subject to United States federal corporate income tax. We use TRS entities to facilitate our ability to offer certain services and activities to our residents and investment partners that cannot be offered directly by a REIT. We also use TRS entities to hold investments in certain apartment communities. For our TRS entities, deferred income taxes result from temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for United States federal income tax purposes, and are measured using the enacted tax rates and laws that are expected to be in effect when the differences reverse. We reduce deferred tax assets by recording a valuation allowance when we determine, based on available evidence, that it is more likely than not that the assets will not be realized. As further discussed under the Accounting Pronouncements Adopted in the Current Year heading within this note, commencing in 2017, we recognize the tax consequences associated with intercompany transfers between the Aimco Operating Partnership and TRS entities when such transactions occur. Refer to Note 9 for further information about our income taxes.
Comprehensive Income or Loss	Comprehensive Income or Loss As discussed under the preceding Investments in Securitization Trust that holds Aimco Property Debt heading, we have investments that are measured at fair value with unrealized gains or losses recognized as an adjustment of accumulated other comprehensive loss within equity and partners’ capital. Additionally, as discussed in Note 11 , we recognize changes in the fair value of our cash flow hedges as an adjustment of accumulated other comprehensive loss within equity and partners’ capital. The amounts of consolidated comprehensive income for the years ended December 31, 2017 , 2016 and 2015 , along with the corresponding amounts of such comprehensive income attributable to Aimco, the Aimco Operating Partnership and to noncontrolling interests, are presented within the accompanying consolidated statements of comprehensive income.
Earnings Per Share and Unit	Earnings per Share and Unit Aimco and the Aimco Operating Partnership calculate earnings (loss) per share and unit based on the weighted average number of shares of Common Stock or common partnership units, participating securities, common stock or common unit equivalents and dilutive convertible securities outstanding during the period. The Aimco Operating Partnership considers both common partnership units and equivalents, which have identical rights to distributions and undistributed earnings, to be common units for purposes of the earnings per unit computations. See Note 10 for further information regarding earnings per share and unit computations.
Use of Estimates	Use of Estimates The preparation of our consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts included in the financial statements and accompanying notes thereto. Actual results could differ from those estimates.
Reclassifications	Reclassifications Certain items included in the 2016 and 2015 financial statements have been reclassified to conform to the current presentation.
New Accounting Pronouncements and Changes in Accounting Principles	Accounting Pronouncements Adopted in the Current Year During 2017, we elected to adopt early the new accounting standard that revised the GAAP definition of a business. Under the new standard we expect apartment communities will no longer be considered businesses; therefore, transaction costs incurred related to the acquisition of real estate operations will be capitalized as a cost of the acquisition. Additionally, we will no longer allocate goodwill to sales of apartment communities for purposes of calculating gain or loss upon sale. We have applied the new standard prospectively to transactions occurring after adoption, which did not have a significant effect on our financial condition or results of operations. Effective January 1, 2017, we adopted a new standard issued by the Financial Accounting Standards Board, or FASB, that simplifies the accounting for the income tax consequences of intercompany transfers of assets. Previously, the recognition within the statement of operations of income tax expense or benefit resulting from an intercompany transfer of assets did not occur until the assets affect GAAP income or loss, for example, through depreciation, impairment or upon the sale of the asset to a third-party. Under the new standard, we are required to recognize the income tax expense or benefit from an intercompany transfer of assets when the transfer occurs. We have applied this change on a modified retrospective basis and recognized a cumulative effect adjustment to retained earnings and partners’ capital of $65.7 million as of January 1, 2017, representing accumulated unrecognized tax expense from intercompany transfers between the Aimco Operating Partnership and TRS entities. Such amounts were included in other assets within our consolidated balance sheets at December 31, 2016. Also effective January 1, 2017, we adopted guidance that simplifies the accounting for share-based compensation. Under prior practice, tax benefits in excess of those associated with compensation cost recognized in accordance with GAAP, or windfalls, were recorded in equity and tax deficiencies were recorded in equity until previous windfalls had been recovered and then recognized in earnings. Under the new guidance, all of the tax effects related to share-based compensation are recognized through earnings. This guidance is applied to all windfalls and tax deficiencies resulting from settlements occurring after January 1, 2017. The new guidance also requires windfalls to be recorded in the period the related transaction triggering tax consequences occurs, such as an exercise of stock options or vesting of restricted shares. This change in timing of recognition has been applied on a modified retrospective basis. We did not record a cumulative effect adjustment to opening retained earnings on the date of adoption as there were no accumulated windfalls recorded in equity. Compared to prior periods, we may experience incremental volatility in income tax benefit or expense resulting from the recognition in earnings of windfall benefits or deficiencies upon the exercise of stock options and vesting of restricted shares.
Recent Accounting Pronouncements	Recent Accounting Pronouncements The FASB has issued new standards that affect accounting for revenue from contracts with customers and are effective for us on January 1, 2018. The new revenue standards establish a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersede most current GAAP applicable to revenue recognition. The core principle of the new guidance is that revenue should only be recognized when an entity has transferred control of goods or services to a customer and for an amount reflecting the consideration to which the entity expects to be entitled for such exchange. We have completed our analysis of the effect this guidance will have on our consolidated financial statements and have determined we will not recognize a cumulative effect adjustment upon adoption. We do not anticipate changes to the timing or amount of revenue we recognize on an ongoing basis as substantially all of our revenue is earned from leases and is subject to the current lease standard until the adoption of the new lease standard, which is discussed below. The FASB has also issued a new standard on lease accounting, which is effective for us on January 1, 2019. Under the new lease standard, lessor accounting will be largely unchanged, but lessees will be required to recognize a right of use asset and a lease liability for virtually all leases, with such leases classified as either operating or finance. The new standard must be adopted using a modified retrospective method, which requires application of the new guidance at the beginning of the earliest comparative period presented and provides for certain practical expedients, which we anticipate electing. We do not anticipate significant changes in the timing of income from our leases with residents. However, in circumstances where we are a lessee, in primarily a limited population of ground leases and leases for corporate office space, we will be required to recognize right of use assets and related lease liabilities on our consolidated balance sheets. We do not anticipate the adoption of this standard will have a material effect on our financial condition or results of operations. We are in the process of determining the amount of the right of use assets and related lease liabilities that will be recognized upon adoption. During 2016, the FASB also issued an Accounting Standards Update that is intended to reduce diversity in the classification and presentation of changes in restricted cash in the statement of cash flows and is effective for us on January 1, 2018. The new standard requires that the statement of cash flows describe the changes in the combined balances of cash and cash equivalents and restricted cash during the period. The guidance is required to be applied retrospectively to each period presented in the financial statements. We currently present transfers between restricted and unrestricted cash accounts as operating, investing and financing activities depending upon the required or intended purpose for the restricted funds, and cash receipts and payments directly with third parties to or from restricted cash accounts are presented on the statement of cash flows as a net change in restricted cash and classified similarly to transfers between restricted and unrestricted cash. We expect that the primary change to our statement of cash flows will be the presentation of activity in the restricted cash accounts combined with similar activity in unrestricted accounts.
Fair Value of Financial Instruments	We estimate the fair value of these investments using an income and market approach with primarily observable inputs, including yields and other information regarding similar types of investments, and adjusted for certain unobservable inputs specific to these investments. The fair value of the positions that pay interest currently typically moves in an inverse relationship with movements in interest rates. The fair value of the first loss position is primarily correlated to collateral quality and demand for similar subordinate commercial mortgage-backed securities. Recurring Fair Value Measurements We measure at fair value on a recurring basis our investment in the securitization trust that holds certain of our property debt, which we classify as available for sale (AFS) debt securities, and our interest rate swaps, both of which are classified within Level 2 of the GAAP fair value hierarchy.

Basis of Presentation and Sum25

Basis of Presentation and Summary of Significant Accounting Policies - (Tables)	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of expected amortization of deferred revenue leases	At December 31, 2017 , our below-market leases had a weighted average amortization period of 6.2 years and estimated aggregate amortization for each of the five succeeding years as follows (in thousands): Estimated Amortization 2018 $1,128 2019 998 2020 886 2021 811 2022 763
Schedule of Other Assets	At December 31, 2017 and 2016 , other assets was comprised of the following amounts (dollars in thousands): 2017 2016 Investments in securitization trust that holds Aimco property debt $ 82,794 $ 76,063 Accumulated unrecognized deferred tax expense from intercompany transfers — 62,468 Deferred tax asset, net (Note 9) 32,227 5,076 Intangible assets, net 38,701 39,039 Prepaid expenses, commissions, real estate taxes and insurance 36,508 37,082 Software, equipment and leasehold improvements 20,048 22,209 Investments in unconsolidated real estate partnerships 12,636 12,496 Accounts receivable, net 11,417 13,042 Deferred expenses, deposits, notes receivable and other 38,408 26,293 Other assets per consolidated balance sheets $ 272,739 $ 293,768

Significant Transactions - (Ta

Significant Transactions - (Tables)	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Summary of properties disposed by sale	Summarized information regarding apartment communities sold during the years ended December 31, 2017 , 2016 and 2015 is set forth in the table below (dollars in thousands): 2017 2016 2015 Real Estate portfolio: Apartment communities sold 5 7 11 Apartment homes sold 2,291 3,045 3,855 Gain on disposition, net of tax 297,944 377,280 180,593 Consolidated partnerships served by the Asset Management business: Apartment communities sold 2 1 — Apartment homes sold 252 296 — Gain on disposition, net of tax 1,615 16,510 —

Non-Recourse Property Debt an27

Non-Recourse Property Debt and Credit Agreement - (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Summarizes property loans payable related to properties classified as held for use	The following table summarizes non-recourse property debt related to assets classified as held for use at December 31, 2017 and 2016 (in thousands): 2017 2016 Fixed-rate property debt $ 3,480,378 $ 3,564,979 Variable-rate property debt 82,663 83,644 Debt issue costs, net of accumulated amortization (17,932 ) (18,347 ) Non-recourse property debt, net $ 3,545,109 $ 3,630,276 The following table summarizes non-recourse property debt related to assets classified as held for use at December 31, 2017 and 2016 (in thousands): 2017 2016 Fixed-rate property debt 231,374 241,024 Debt issue costs, net of accumulated amortization (4,233 ) (4,598 ) Non-recourse property debt, net $ 227,141 $ 236,426
Scheduled principal amortization and maturity payments	As of December 31, 2017 , the scheduled payments for the non-recourse property debt related to apartment communities classified as held for use were as follows (in thousands): Scheduled Payments 2018 $ 5,959 2019 6,192 2020 9,317 2021 17,090 2022 4,714 Thereafter 188,102 Total $ 231,374 As of December 31, 2017 , the scheduled principal amortization and maturity payments for the non-recourse property debt related to apartment communities classified as held for use were as follows (in thousands): Amortization Maturities 2018 $ 74,807 $ 173,733 2019 71,792 481,136 2020 65,362 296,967 2021 49,542 741,523 2022 39,778 233,439 Thereafter 1,334,962 Total $ 3,563,041

Commitments and Contingencies

Commitments and Contingencies - (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Approximate minimum annual rentals under operating lease obligations and sublease receivables	Approximate minimum annual rental payments under operating leases are as follows (in thousands): Office Lease Obligations Ground Lease Obligations Total Operating Lease Obligations 2018 $ 2,203 $ 1,179 $ 3,382 2019 1,050 1,279 2,329 2020 963 1,514 2,477 2021 832 1,550 2,382 2022 628 1,550 2,178 Thereafter — 79,337 79,337 Total $ 5,676 $ 86,409 $ 92,085

Partners' Capital - (Tables)

Partners' Capital - (Tables)	12 Months Ended
	Dec. 31, 2017
Partners' Capital [Abstract]
Schedule of Preferred Units	As of December 31, 2017 and 2016 , the Aimco Operating Partnership had the following classes of preferred OP Units (stated at their redemption values, in thousands, except unit and per unit data): Distributions per Annum Units Issued and Outstanding Redemption Values Class of Preferred Units Percent Per Unit 2017 2016 2017 2016 Class One 8.75 % $ 8.00 90,000 90,000 $ 8,229 $ 8,229 Class Two 1.92 % $ 0.48 17,750 17,750 444 444 Class Three 7.88 % $ 1.97 1,338,524 1,341,289 33,462 33,532 Class Four 8.00 % $ 2.00 644,954 644,954 16,124 16,124 Class Six 8.50 % $ 2.13 780,036 780,036 19,501 19,501 Class Seven 7.87 % $ 1.97 27,960 27,960 699 699 Class Nine 6.00 % $ 1.50 243,112 306,890 6,078 7,672 Class Ten 6.00 % $ 1.50 680,000 680,000 17,000 17,000 Total 3,822,336 3,888,879 $ 101,537 $ 103,201
Temporary Equity	The following table presents a reconciliation of the Aimco Operating Partnership’s preferred OP Units during the years ended December 31, 2017 , 2016 and 2015 (dollars in thousands): 2017 2016 2015 Balance at January 1 $ 103,201 $ 87,926 $ 87,937 Preferred distributions (7,764 ) (7,239 ) (6,943 ) Redemption of preferred units and other (1,664 ) (1,725 ) (11 ) Issuance of preferred units — 17,000 — Net income 7,764 7,239 6,943 Balance at December 31 $ 101,537 $ 103,201 $ 87,926

Share-Based Compensation - (Ta

Share-Based Compensation - (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of outstanding stock options	The following table summarizes activity for our outstanding stock options, for the years ended December 31, 2017 , 2016 and 2015 (numbers of options in thousands): 2017 2016 2015 Number of Options Weighted Number of Options Weighted Number of Options Weighted Outstanding at beginning of year 675 $ 29.55 1,394 $ 30.85 1,640 $ 28.91 Granted 184 44.07 216 38.73 239 39.05 Exercised (211 ) 9.90 (934 ) 33.61 (484 ) 28.33 Forfeited — — (1 ) 29.11 (1 ) 25.78 Outstanding at end of year 648 $ 40.08 675 $ 29.55 1,394 $ 30.85 Exercisable at end of year 128 $ 37.59 280 $ 16.38 1,155 $ 29.16
Summary of restricted stock awards	The following table summarizes activity for Time-Based Restricted Stock awards for the years ended December 31, 2017 , 2016 and 2015 (numbers of shares in thousands): 2017 2016 2015 Number of Shares Weighted Number of Shares Weighted Number of Shares Weighted Unvested at beginning of year 249 $ 33.61 339 $ 29.96 513 $ 26.34 Granted 45 44.07 91 40.03 145 39.39 Vested (134 ) 32.35 (181 ) 29.99 (259 ) 27.54 Forfeited — — — — (60 ) 32.29 Unvested at end of year 160 $ 37.63 249 $ 33.61 339 $ 29.96 The following table summarizes activity for TSR Restricted Stock awards for the years ended December 31, 2017 , 2016 and 2015 (numbers of shares in thousands): 2017 2016 2015 Number of Shares Weighted Number of Shares Weighted Number of Shares Weighted Unvested at beginning of year 214 $ 39.66 123 $ 39.72 — $ — Granted 39 46.39 91 39.59 142 39.72 Forfeited — — — — (19 ) 39.72 Unvested at end of year 253 $ 40.70 214 $ 39.66 123 $ 39.72 The following table summarizes activity for TSR LTIP units for the years ended December 31, 2017 (numbers of units in thousands): 2017 Number of Units Weighted Unvested at beginning of year — $ — Granted 45 46.21 Unvested at end of year 45 $ 46.21
Schedule of assumptions used in Monte Carlo models for TSR awards	The midpoints of our valuation assumptions for the 2017 , 2016 and 2015 grants were as follows: 2017 2016 2015 Grant date market value of a common share $ 44.07 $ 38.73 $ 39.05 Risk-free interest rate 1.57 % 1.15 % 1.04 % Dividend yield 3.27 % 3.41 % 2.87 % Expected volatility 21.33 % 21.24 % 19.48 % Derived vesting period of TSR Restricted Stock and TSR LTIP units 3.4 years 3.4 years 3.4 years Weighted average expected term of TSR Stock Options 5.8 years 5.8 years n/a

Income Taxes - (Tables)

Income Taxes - (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Components of deferred tax liabilities and assets	Significant components of our deferred tax liabilities and assets are as follows (in thousands): December 31, 2017 2016 Deferred tax liabilities: Real estate and real estate partnership basis differences $ 32,032 $ 72,726 Deferred tax assets: Net operating, capital and other loss carryforwards $ 9,523 $ 8,873 Accruals and expenses 6,575 7,537 Tax credit carryforwards 73,450 65,559 Management contracts and other 200 300 Total deferred tax assets 89,748 82,269 Valuation allowance (25,489 ) (4,467 ) Net deferred tax assets $ 32,227 $ 5,076
Reconciliation of unrecognized tax benefits	A reconciliation of the beginning and ending balance of our unrecognized tax benefits is presented below (in thousands): 2017 2016 2015 Balance at January 1 $ 2,286 $ 2,897 $ 2,286 Additions (reductions) based on tax positions related to prior years 190 (611 ) 611 Balance at December 31 $ 2,476 $ 2,286 $ 2,897
Components of the provision (benefit) for income taxes	Significant components of the income tax benefit or expense are as follows and are classified within income tax benefit in income before gain on dispositions and gain on dispositions of real estate, net of tax, in our consolidated statements of operations for the years ended December 31, 2017 , 2016 and 2015 (in thousands): 2017 2016 2015 Current: Federal (1) $ (938 ) $ 5,038 $ 1,310 State 525 2,916 1,357 Total current (413 ) 7,954 2,667 Deferred: Federal (10,908 ) (26,173 ) (27,382 ) State (3,621 ) (623 ) (1,052 ) Revaluation of deferred taxes due to change in tax rate (15,894 ) — — Total deferred (30,423 ) (26,796 ) (28,434 ) Total benefit $ (30,836 ) $ (18,842 ) $ (25,767 ) Classification: Income before gain on dispositions $ (32,126 ) $ (25,208 ) $ (27,524 ) Gain on dispositions of real estate $ 1,290 $ 6,366 $ 1,757 (1) As a result of the 2017 Act, Alternative Minimum Tax credits that are not used will be refunded before 2022, therefore in 2017 we reclassified $2.7 million in AMT credits from deferred tax assets to receivables, which is included in other assets on our consolidated balance sheet, resulting in a net current federal tax benefit.
Reconciliation of income tax attributable to continuing and discontinued operations	The reconciliation of income tax attributable to operations computed at the United States statutory rate to income tax benefit is shown below (dollars in thousands): 2017 2016 2015 Amount Percent Amount Percent Amount Percent Tax (benefit) provision at United States statutory rates on consolidated income or loss subject to tax $ (19,459 ) 35.0 % $ 38,257 35.0 % $ (10,947 ) 35.0 % State income tax expense, net of federal tax (benefit) expense (1,769 ) 3.2 % 7,152 6.5 % (361 ) 1.2 % Establishment of deferred tax asset related to partnership basis difference (1) (3,501 ) 6.3 % — — % — — % Effect of permanent differences (1,629 ) 2.9 % (132 ) (0.1 )% (27 ) 0.1 % Tax effect of intercompany transactions (2) — — % (47,369 ) (43.3 )% (1,515 ) 4.8 % Tax credits (9,607 ) 17.3 % (16,750 ) (15.3 )% (13,583 ) 43.4 % Tax reform revaluation (3) (15,894 ) 28.6 % — — % — — % Increase in valuation allowance (4) 21,023 (37.8 )% — — % 666 (2.1 )% Total income tax benefit $ (30,836 ) 55.5 % $ (18,842 ) (17.2 )% $ (25,767 ) 82.4 % (1) Includes the establishment of a deferred tax asset related to partnership basis difference when it became apparent that it would reverse in the foreseeable future. This deferred tax asset is fully reserved in the valuation allowance described below. (2) 2016 and 2015 include the effect of intercompany asset transfers between the Aimco Operating Partnership and TRS entities, for which tax was deferred and recognized as the assets affected GAAP income or loss, for example, through depreciation, impairment, or upon the sale of the asset to a third-party. Effective January 1, 2017, we adopted a new accounting standard applicable to intercompany asset transfers. As a result, the accumulated unrecognized deferred tax expense associated with historical intercompany transfers was recognized as a cumulative effect adjustment through retained earnings at that time, as further described in Note 2 . (3) Reflects revaluation of deferred tax assets and liabilities using the TRS entities’ lower effective tax rates resulting from the 2017 Act. (4) Includes a $15.4 million valuation allowance against the deferred tax assets associated with rehabilitation tax credits due to the lower federal tax rate under the 2017 Act.
Dividends paid to holders of Common Stock	For the years ended December 31, 2017 , 2016 and 2015 , dividends per share held for the entire year were estimated to be taxable as follows: 2017 2016 2015 Amount Percentage Amount Percentage Amount Percentage Ordinary income $ 0.75 51.5 % $ 0.45 34.2 % $ 0.36 30.2 % Capital gains 0.51 35.7 % 0.47 35.4 % 0.37 31.3 % Qualified dividends 0.02 1.6 % 0.13 9.9 % 0.17 14.5 % Unrecaptured Section 1250 gain 0.16 11.2 % 0.27 20.5 % 0.28 24.0 % $ 1.44 100.0 % $ 1.32 100.0 % $ 1.18 100.0 %

Fair Value Measurements - (Tab

Fair Value Measurements - (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair value of assets and liabilities measured on a recurring basis	The following table sets forth a summary of changes in fair value in the interest rate swaps (in thousands): Year Ended December 31, 2017 2016 2015 Beginning balance $ (3,175 ) $ (4,938 ) $ (5,273 ) Realized (unrealized) losses included in interest expense 73 (44 ) (44 ) Realized losses on derecognition of interest rate swaps included in earnings 273 — — Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss 1,207 1,586 1,678 Unrealized (losses) gains included in equity and partners’ capital (173 ) 221 (1,299 ) Ending balance $ (1,795 ) $ (3,175 ) $ (4,938 )

Business Segments - (Tables)

Business Segments - (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Summary information for the reportable segments	The following tables present the revenues, net operating income and income before gain on dispositions of our Real Estate segment on a proportionate basis (excluding amounts related to apartment communities sold or classified as held for sale as of December 31, 2017 ) for the years ended December 31, 2017 , 2016 and 2015 (in thousands): Real Estate Proportionate Adjustments (1) Corporate and Amounts Not Allocated to Reportable Segment (2) Consolidated Year Ended December 31, 2017: Rental and other property revenues attributable to Real Estate $ 854,491 $ 15,481 $ 48,176 $ 918,148 Rental and other property revenues of partnerships served by Asset Management business — — 74,046 74,046 Tax credit and transaction revenues — — 13,243 13,243 Total revenues 854,491 15,481 135,465 1,005,437 Property operating expenses attributable to Real Estate 265,186 4,887 48,866 318,939 Property operating expenses of partnerships served by Asset Management business — — 35,440 35,440 Other operating expenses not allocated to reportable segment (3) — — 457,075 457,075 Total operating expenses 265,186 4,887 541,381 811,454 Operating income 589,305 10,594 (405,916 ) 193,983 Other items included in income before gain on dispositions (4) — — (146,463 ) (146,463 ) Income before gain on dispositions $ 589,305 $ 10,594 $ (552,379 ) $ 47,520 Real Estate Proportionate Adjustments (1) Corporate and Amounts Not Allocated to Reportable Segment (2) Consolidated Year Ended December 31, 2016: Rental and other property revenues attributable to Real Estate $ 791,587 $ 28,509 $ 79,795 $ 899,891 Rental and other property revenues of partnerships served by Asset Management business — — 74,640 74,640 Tax credit and transaction revenues — — 21,323 21,323 Total revenues 791,587 28,509 175,758 995,854 Property operating expenses attributable to Real Estate 251,636 8,284 58,037 317,957 Property operating expenses of partnerships served by Asset Management business — — 36,956 36,956 Other operating expenses not allocated to reportable segment (3) — — 394,145 394,145 Total operating expenses 251,636 8,284 489,138 749,058 Operating income 539,951 20,225 (313,380 ) 246,796 Other items included in income before gain on dispositions (4) — — (157,313 ) (157,313 ) Income before gain on dispositions $ 539,951 $ 20,225 $ (470,693 ) $ 89,483 Real Estate Proportionate Adjustments (1) Corporate and Amounts Not Allocated to Reportable Segment (2) Consolidated Year Ended December 31, 2015: Rental and other property revenues attributable to Real Estate $ 737,079 $ 28,875 $ 117,066 $ 883,020 Rental and other property revenues of partnerships served by Asset Management business — — 73,934 73,934 Tax credit and transaction revenues — — 24,356 24,356 Total revenues 737,079 28,875 215,356 981,310 Property operating expenses attributable to Real Estate 240,789 8,857 74,933 324,579 Property operating expenses of partnerships served by Asset Management business — — 37,537 37,537 Other operating expenses not allocated to reportable segment (3) — — 362,979 362,979 Total operating expenses 240,789 8,857 475,449 725,095 Operating income 496,290 20,018 (260,093 ) 256,215 Other items included in income before gain on dispositions (4) — — (164,825 ) (164,825 ) Income before gain on dispositions $ 496,290 $ 20,018 $ (424,918 ) $ 91,390 (1) Represents adjustments for the noncontrolling interests in consolidated real estate partnerships’ share of the results of consolidated apartment communities in our Real Estate segment, which are included in the related consolidated amounts, but excluded from proportionate property net operating income for our segment evaluation. (2) Includes the operating results of apartment communities sold during the periods shown or held for sale at the end of the period, if any, and the operating results of apartment communities owned by consolidated partnerships served by our Asset Management business. Corporate and Amounts Not Allocated to Reportable Segment also includes property management expenses and casualty gains and losses (which are included in consolidated property operating expenses), which are property related items that are not part of our segment performance measure. (3) Other operating expenses not allocated to reportable segment consists of depreciation and amortization, general and administrative expenses and other operating expenses including provision for real estate impairment loss, which are not included in our measure of segment performance. (4) Other items included in income before gain on dispositions primarily consist of interest expense and income tax benefit.
Assets of reportable segments	The assets of our reportable segment and the consolidated assets not allocated to our segment are as follows (in thousands): December 31, 2017 2016 Real Estate $ 5,495,069 $ 5,432,642 Corporate and other assets (1) 583,971 800,176 Total consolidated assets $ 6,079,040 $ 6,232,818 (1) Includes the assets of consolidated partnerships served by the Asset Management business and apartment communities sold or classified as held for sale as of December 31, 2017 .

Variable Interest Entities - (

Variable Interest Entities - (Tables)	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Variable Interest Entities	The table below summarizes information regarding VIEs that are consolidated by the Aimco Operating Partnership: December 31, 2017 2016 Real Estate portfolio: VIEs with interests in apartment communities 14 17 Apartment communities held by VIEs 14 19 Apartment homes in communities held by VIEs 4,321 6,110 Consolidated partnerships served by the Asset Management business: VIEs with interests in apartment communities 49 50 Apartment communities held by VIEs 37 38 Apartment homes in communities held by VIEs 5,893 6,093 Assets of the Aimco Operating Partnership’s consolidated VIEs must first be used to settle the liabilities of such consolidated VIEs. These consolidated VIEs’ creditors do not have recourse to the general credit of the Aimco Operating Partnership. Assets and liabilities of VIEs are summarized in the table below (in thousands): December 31, 2017 2016 Real Estate portfolio: Assets Net real estate $ 529,898 $ 897,510 Cash and cash equivalents 16,111 15,877 Restricted cash 4,798 7,981 Liabilities Non-recourse property debt 412,205 725,061 Accrued liabilities and other 10,623 14,270 Consolidated partnerships served by the Asset Management business: Assets Real estate, net 215,580 235,920 Cash and cash equivalents 15,931 14,926 Restricted cash 30,107 32,542 Liabilities Non-recourse property debt 220,356 229,509 Accrued liabilities and other 20,241 16,934

Unaudited Summarized Consolid35

Unaudited Summarized Consolidated Quarterly Information - (Tables)	12 Months Ended
	Dec. 31, 2017
Schedule of Unaudited Quarterly Financial Information [Line Items]
Summarized unaudited consolidated quarterly information	Aimco’s summarized unaudited consolidated quarterly information for the years ended December 31, 2017 and 2016 , is provided below (in thousands, except per share amounts): Quarter 2017 First Second Third Fourth Total revenues $ 246,481 $ 249,092 $ 254,635 $ 255,229 Operating income 57,789 59,706 59,205 17,283 Net income 17,155 21,591 22,144 286,189 Net income attributable to Aimco common stockholders 11,491 15,843 17,430 262,097 Net income attributable to Aimco common stockholders per common share - basic $ 0.07 $ 0.10 $ 0.11 $ 1.68 Net income attributable to Aimco common stockholders per common share - diluted $ 0.07 $ 0.10 $ 0.11 $ 1.67 Quarter 2016 First Second Third Fourth Total revenues $ 246,239 $ 251,218 $ 248,904 $ 249,493 Operating income 63,534 64,436 58,732 60,094 Net income 29,885 245,953 30,036 177,399 Net income attributable to Aimco common stockholders 23,223 221,382 11,176 162,000 Net income attributable to Aimco common stockholders per common share - basic $ 0.15 $ 1.42 $ 0.07 $ 1.04 Net income attributable to Aimco common stockholders per common share - diluted $ 0.15 $ 1.41 $ 0.07 $ 1.03
AIMCO PROPERTIES, L.P.
Schedule of Unaudited Quarterly Financial Information [Line Items]
Summarized unaudited consolidated quarterly information	The Aimco Operating Partnership’s summarized unaudited consolidated quarterly information for the years ended December 31, 2017 and 2016 , is provided below (in thousands, except per unit amounts): Quarter 2017 First Second Third Fourth Total revenues $ 246,481 $ 249,092 $ 254,635 $ 255,229 Operating income 57,789 59,706 59,205 17,283 Net income 17,155 21,591 22,144 286,189 Net income attributable to the Partnership’s common unitholders 12,047 16,627 18,246 274,380 Net income attributable to the Partnership’s common unitholders per common unit - basic $ 0.07 $ 0.10 $ 0.11 $ 1.68 Net income attributable to the Partnership’s common unitholders per common unit - diluted $ 0.07 $ 0.10 $ 0.11 $ 1.67 Quarter 2016 First Second Third Fourth Total revenues $ 246,239 $ 251,218 $ 248,904 $ 249,493 Operating income 63,534 64,436 58,732 60,094 Net income 29,885 245,953 30,036 177,399 Net income attributable to the Partnership’s common unitholders 24,395 232,517 11,368 169,869 Net income attributable to the Partnership’s common unitholders per common unit - basic $ 0.15 $ 1.42 $ 0.07 $ 1.04 Net income attributable to the Partnership’s common unitholders per common unit - diluted $ 0.15 $ 1.41 $ 0.07 $ 1.03

Organization - Narrative (Deta

Organization - Narrative (Details)	12 Months Ended
	Dec. 31, 2017UnitsPropertyshares	Dec. 31, 2016shares
Organization [Line Items]
Common partnership units and equivalents outstanding (in shares) | shares	157,189,447
Shares of common stock outstanding (in shares) | shares	157,189,447	156,888,381
Aimco's ownership interest in AIMCO Properties, L.P.	95.50%
Partially Owned Properties | Aimco Real Estate
Organization [Line Items]
Number of apartment communities | Property	136
Number of apartment homes | Units	36,904
Partially Owned Properties | Asset Management
Organization [Line Items]
Number of apartment communities | Property	46
Number of apartment homes | Units	6,898
Wholly and Partially Owned And Consolidated Properties | Aimco Real Estate
Organization [Line Items]
Number of apartment communities | Property	132
Number of apartment homes | Units	36,762
Wholly and Partially Owned And Consolidated Properties | Asset Management
Organization [Line Items]
Number of apartment communities | Property	39
Number of apartment homes | Units	6,211
AIMCO PROPERTIES, L.P.
Organization [Line Items]
Common partnership units and equivalents outstanding (in shares) | shares	164,617,537

Basis of Presentation and Sum37

Basis of Presentation and Summary of Significant Accounting Policies - Acquisition of Real Estate and Related Depreciation and Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Real Estate Properties [Line Items]
Weighted average depreciable life of acquired buildings and improvements	15 years
Below market lease, net	$ 9,100	$ 10,400
Below market lease, accumulated amortization	34,400	33,100
Amortization of below market lease	1,300	$ 1,700	$ 1,700
Schedule of expected amortization of below market obligations related to acquired leases
2,018	1,128
2,019	998
2,020	886
2,021	811
2,022	$ 763
Leases, Acquired-in-Place, Market Adjustment
Real Estate Properties [Line Items]
Weighted average amortization period of below market leases	6 years 2 months

Basis of Presentation and Sum38

Basis of Presentation and Summary of Significant Accounting Policies - Capital Additions and Related Depreciation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Useful life	15 years
Interest costs capitalized	$ 7.6	$ 9.6	$ 11.7
Other direct and indirect costs capitalized	$ 36	$ 32.9	$ 28.2
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Useful life	5 years
Minimum
Property, Plant and Equipment [Line Items]
Useful life	5 years
Maximum
Property, Plant and Equipment [Line Items]
Useful life	30 years
Weighted Average | Building and Building Improvements
Property, Plant and Equipment [Line Items]
Useful life	28 years

Basis of Presentation and Sum39

Basis of Presentation and Summary of Significant Accounting Policies - Other Assets (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Asset Reconciling Item [Line Items]
Deferred tax asset, net (Note 9)	$ 32,227,000	$ 5,076,000
Aimco Real Estate
Segment Reporting, Asset Reconciling Item [Line Items]
Investments in securitization trust that holds Aimco property debt	82,794,000	76,063,000
Accumulated unrecognized deferred tax expense from intercompany transfers	0	62,468,000
Deferred tax asset, net (Note 9)	32,227,000	5,076,000
Intangible assets, net	38,701,000	39,039,000
Prepaid expenses, commissions, real estate taxes and insurance	36,508,000	37,082,000
Software, equipment and leasehold improvements	20,048,000	22,209,000
Investments in unconsolidated real estate partnerships	12,636,000	12,496,000
Accounts receivable, net	11,417,000	13,042,000
Deferred expenses, deposits, notes receivable and other	38,408,000	26,293,000
Other assets per consolidated balance sheets	$ 272,739,000	$ 293,768,000

Basis of Presentation and Sum40

Basis of Presentation and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Goodwill	$ 37.8		$ 37.8
Goodwill written off related to sale of business unit	$ 4.5	$ 1.2

Basis of Presentation and Sum41

Basis of Presentation and Summary of Significant Accounting Policies - Capitalized Software Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Capitalized software purchase and development costs	$ 2	$ 3.4	$ 3.6
Net capitalized software	9.1	12.6
Amortization of capitalized software	$ 5.5	$ 7.2	$ 6.9
Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of software	3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of software	5 years

Basis of Presentation and Sum42

Basis of Presentation and Summary of Significant Accounting Policies - Noncontrolling Interests in Aimco Operating Partnership (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Weighted average ownership interest	4.50%	4.70%	4.70%

Basis of Presentation and Sum43

Basis of Presentation and Summary of Significant Accounting Policies - Revenue Recognition (Details)	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Average term of operating leases	12 months

Basis of Presentation and Sum44

Basis of Presentation and Summary of Significant Accounting Policies - Tax Credit Arrangements (Details)	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Term over which tax credits are generally realized	10 years
Compliance period for low income housing tax credit syndication agreements	15 years
Economic Interest in Low Income Housing Tax Credit Partnerships	approximately 100%

Basis of Presentation and Sum45

Basis of Presentation and Summary of Significant Accounting Policies - Income Taxes (Details)	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Percentage of income tax on income from non-arms length transactions	100.00%

Basis of Presentation and Sum46

Basis of Presentation and Summary of Significant Accounting Policies - Accounting Pronouncements Adopted in the Current Year (Details) $ in Thousands	Jan. 01, 2017USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings and partners' capital	$ 65,710
Retained Earnings and Partners' Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings and partners' capital	$ 65,700

Significant Transactions - Rea

Significant Transactions - Reacquisition of Limited Partner Interest in Palazzo Joint Venture (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)UnitsProperty	Dec. 31, 2016USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling interests in consolidated real estate partnerships	$ (1,716)	$ 151,121
Palazzo Acquisition | Aimco Real Estate | Palazzo Joint Venture - Los Angeles CA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling interests in consolidated real estate partnerships	$ 451,500
Noncontrolling limited partner interest (percent)	47.00%
Number of apartment communities | Property	3
Number of apartment homes | Units	1,382
Noncontrolling interest partner's share of existing non-recourse property-level debt	$ 140,500
Cash considerations paid	311,000
Adjustments to additional paid in capital, other	$ 155,600

Significant Transactions - Acq

Significant Transactions - Acquisitions of Apartment Communities - Narrative (Details) $ in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2018USD ($)Units	Dec. 31, 2016USD ($)Units
Indigo
Asset Acquisitions [Line Items]
Number of apartment homes | Units		463
Payments to acquire and develop real estate		$ 303
Preferred units issued during period, value		$ 17
Per annum distribution rate		6.00%
Capitalized asset acquisition costs		$ 1.8
Total fair value allocated to land		26.9
Total fair value allocated to buildings and improvements		292.7
Total fair value allocated to furniture and fixtures		$ 2.2
Fairfax county, Virginia | Subsequent Event
Asset Acquisitions [Line Items]
Number of apartment homes | Units	748
Payments to acquire and develop real estate	$ 160

Significant Transactions - Dis

Significant Transactions - Disposition of Apartment Communities and Assets Held For Sale (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2018USD ($)	Dec. 31, 2017USD ($)UnitsProperty	Dec. 31, 2016USD ($)UnitsProperty	Dec. 31, 2015USD ($)UnitsProperty
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Provision for real estate impairment loss		$ 35,881	$ 0	$ 0
Gain on dispositions of real estate, net of tax		$ 299,559	$ 393,790	$ 180,593
Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on dispositions of real estate, net of tax	$ 51,000
Gross proceeds from the sale of real estate	71,900
Net proceeds to Aimco from the sale of real estate	$ 64,600
Wholly and Partially Owned And Consolidated Properties | Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of apartment communities | Property		513
Number of apartment homes | Units		3
Aimco Real Estate | Wholly and Partially Owned And Consolidated Properties | Disposal Group Disposed Of By Sale Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of apartment communities | Property		5	7	11
Number of apartment homes | Units		2,291	3,045	3,855
Gain on dispositions of real estate, net of tax		$ 297,944	$ 377,280	$ 180,593
Asset Management | Wholly and Partially Owned And Consolidated Properties | Disposal Group Disposed Of By Sale Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of apartment communities | Property		2	1	0
Number of apartment homes | Units		252	296	0
Gain on dispositions of real estate, net of tax		$ 1,615	$ 16,510	$ 0
La Jolla Cove
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Provision for real estate impairment loss		35,800
Provision for real estate impairment loss, portion allocated to deferred tax liability		$ 25,600

Significant Transactions - Nap

Significant Transactions - Napico Disposition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income attributable to noncontrolling interests	$ 9,084	$ 25,256	$ 4,776
Napico Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other nonrecurring gain	7,100	5,200
Net income attributable to noncontrolling interests		$ 8,100
Decrease in other assets from deconsolidation	34,500
Decrease in accrued liabilities and other from deconsolidation	$ 38,400

Non-Recourse Property Debt an51

Non-Recourse Property Debt and Credit Agreement - Schedule of Non-Recourse Property Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Asset Management
Debt Instrument [Line Items]
Non-recourse property debt	$ 227,141	$ 236,426
Debt issue costs, net of accumulated amortization	(4,233)	(4,598)
Aimco Real Estate
Debt Instrument [Line Items]
Non-recourse property debt	3,545,109	3,630,276
Debt issue costs, net of accumulated amortization	(17,932)	(18,347)
Fixed-rate property debt | Asset Management
Debt Instrument [Line Items]
Non-recourse property debt	231,374	241,024
Fixed-rate property debt | Aimco Real Estate
Debt Instrument [Line Items]
Non-recourse property debt	3,480,378	3,564,979
Variable-rate property debt | Aimco Real Estate
Debt Instrument [Line Items]
Non-recourse property debt	$ 82,663	$ 83,644

Non-Recourse Property Debt an52

Non-Recourse Property Debt and Credit Agreement - Narrative (Details)	12 Months Ended
	Dec. 31, 2017USD ($)Property	Dec. 31, 2016USD ($)
Credit Agreement
Revolving loan commitments	$ 600,000,000
Initial interest rate for credit facility	LIBOR plus 1.20%, or, at our option, a base rate plus 0.20%
Spread on variable interest rate	0.20%
Credit facility maturity date	Jan. 22, 2022
Credit facility, dividend restrictions	aggregate amount that does not exceed the greater of 95% of our Funds From Operations for such period, subject to certain non-cash adjustments, or such amount as may be necessary to maintain Aimco’s REIT status
Credit facility interest rate at period end	3.26%	2.09%
Amount outstanding for undrawn letters of credit issued under revolving credit facility	$ 11,500,000
Remaining borrowing capacity under credit facility	$ 521,300,000
London Interbank Offered Rate (LIBOR)
Credit Agreement
Spread on variable interest rate	1.20%
Term Loan
Credit Agreement
Term loan	$ 250,000,000
Extension option (in years)	1 year
Term loan interest rate	30-day LIBOR plus 1.35%
Lender and other fees	$ 1,000,000
Term Loan | London Interbank Offered Rate (LIBOR)
Credit Agreement
Spread on variable interest rate	1.35%
Asset Management | Fixed-rate property debt
Non-Recourse Property Debt (Textual) [Abstract]
Maturity date	Feb. 1, 2061
Weighted average interest rate	5.11%
Aggregate gross book value	$ 551,100,000
Asset Management | Fixed-rate property debt | Pledged as collateral
Non-Recourse Property Debt (Textual) [Abstract]
Number of apartment communities | Property	39
Asset Management | Minimum | Fixed-rate property debt
Non-Recourse Property Debt (Textual) [Abstract]
Interest rate	2.50%
Asset Management | Maximum | Fixed-rate property debt
Non-Recourse Property Debt (Textual) [Abstract]
Interest rate	8.50%
Aimco Real Estate
Credit Agreement
Revolving credit facility borrowings	$ 67,160,000	$ 17,930,000
Aimco Real Estate | Fixed-rate property debt
Non-Recourse Property Debt (Textual) [Abstract]
Maturity date	Jan. 1, 2055
Weighted average interest rate	4.64%
Aggregate gross book value	$ 6,300,000,000
Aimco Real Estate | Fixed-rate property debt | Pledged as collateral
Non-Recourse Property Debt (Textual) [Abstract]
Number of apartment communities | Property	98
Aimco Real Estate | Variable-rate property debt
Non-Recourse Property Debt (Textual) [Abstract]
Maturity date	Jul. 15, 2033
Weighted average interest rate	2.70%
Aggregate gross book value	$ 204,200,000
Aimco Real Estate | Variable-rate property debt | Pledged as collateral
Non-Recourse Property Debt (Textual) [Abstract]
Number of apartment communities | Property	7
Aimco Real Estate | Minimum | Fixed-rate property debt
Non-Recourse Property Debt (Textual) [Abstract]
Interest rate	2.73%
Aimco Real Estate | Minimum | Variable-rate property debt
Non-Recourse Property Debt (Textual) [Abstract]
Interest rate	1.00%
Aimco Real Estate | Maximum | Fixed-rate property debt
Non-Recourse Property Debt (Textual) [Abstract]
Interest rate	8.05%
Aimco Real Estate | Maximum | Variable-rate property debt
Non-Recourse Property Debt (Textual) [Abstract]
Interest rate	3.06%

Non-Recourse Property Debt an53

Non-Recourse Property Debt and Credit Agreement - Schedule of Principal Amortization and Maturity Payments (Details) - Aimco Real Estate $ in Thousands	Dec. 31, 2017USD ($)
Amortization
Amortization, 2018	$ 74,807
Amortization, 2019	71,792
Amortization, 2020	65,362
Amortization, 2021	49,542
Amortization, 2022	39,778
Maturities
Maturities, 2018	173,733
Maturities, 2019	481,136
Maturities, 2020	296,967
Maturities, 2021	741,523
Maturities, 2022	233,439
Thereafter	1,334,962
Total	$ 3,563,041

Non-Recourse Property Debt an54

Non-Recourse Property Debt and Credit Agreement - Schedule of Payments For Non-Recourse Property Debt (Details) - Asset Management $ in Thousands	Dec. 31, 2017USD ($)
Debt Instrument [Line Items]
2,018	$ 5,959
2,019	6,192
2,020	9,317
2,021	17,090
2,022	4,714
Thereafter	188,102
Total	$ 231,374

Commitments and Contingencies55

Commitments and Contingencies - Narrative (Details) $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2017parties	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Commitments and Contingencies [Abstract]
Long-term purchase commitment, period (or less)		12 months
Compliance period for low income housing tax credit syndication agreements		15 years
Number of potentially-responsible parties | parties	4
Minimum
Commitments and Contingencies [Abstract]
Compliance period for low income housing tax credit syndication agreements		1 year
Maximum
Commitments and Contingencies [Abstract]
Compliance period for low income housing tax credit syndication agreements		8 years
Ground Lease Obligations
Commitments and Contingencies [Abstract]
Rent expense		$ 1.8	$ 1.7	$ 0.9
Ground Lease Obligations | Minimum
Commitments and Contingencies [Abstract]
Lessee leasing arrangements, operating leases, term of contract		46 years
Ground Lease Obligations | Maximum
Commitments and Contingencies [Abstract]
Lessee leasing arrangements, operating leases, term of contract		70 years
Office Lease Obligations
Commitments and Contingencies [Abstract]
Rent expense		$ 3	$ 3.3	$ 3.2
Commitments related to development, redevelopment and capital improvement activities
Commitments and Contingencies [Abstract]
Commitments related to capital spending activities		$ 91.1
Commitments related to operations
Commitments and Contingencies [Abstract]
Long-term purchase commitment, period (or less)		1 year

Commitments and Contingencies56

Commitments and Contingencies - Operating Leases (Details) $ in Thousands	Dec. 31, 2017USD ($)
Approximate minimum annual rentals under operating lease obligations
Operating lease obligations, 2018	$ 3,382
Operating lease obligations, 2019	2,329
Operating lease obligations, 2020	2,477
Operating lease obligations, 2021	2,382
Operating lease obligations, 2022	2,178
Operating leases, due thereafter	79,337
Operating lease obligations, total	92,085
Office Lease Obligations
Approximate minimum annual rentals under operating lease obligations
Operating lease obligations, 2018	2,203
Operating lease obligations, 2019	1,050
Operating lease obligations, 2020	963
Operating lease obligations, 2021	832
Operating lease obligations, 2022	628
Operating leases, due thereafter	0
Operating lease obligations, total	5,676
Ground Lease Obligations
Approximate minimum annual rentals under operating lease obligations
Operating lease obligations, 2018	1,179
Operating lease obligations, 2019	1,279
Operating lease obligations, 2020	1,514
Operating lease obligations, 2021	1,550
Operating lease obligations, 2022	1,550
Operating leases, due thereafter	79,337
Operating lease obligations, total	$ 86,409

Aimco Equity - Narrative (Deta

Aimco Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Classes of perpetual preferred stock
Preferred stock, outstanding balance	$ 125,000	$ 125,000
Per share par value of preferred stock issued (dollars per share)	$ 0.01
Dividends declared per common share/unit (dollars per share)	1.44	$ 1.32	$ 1.18
Common stock, par value (dollars per share)	$ 0.01	$ 0.01
Proceeds from issuance of Common Stock	$ 0	$ 0	$ 366,580
Class A Cumulative Preferred Stock
Classes of perpetual preferred stock
Shares of preferred stock authorized (in shares)	5,000,000	5,000,000
Shares of preferred stock issued (in shares)	5,000,000	5,000,000
Shares of preferred stock outstanding (in shares)	5,000,000	5,000,000
Preferred stock, outstanding balance	$ 125,000	$ 125,000
Preferred stock, liquidation preference per share (dollars per share)	$ 25
Redemption date	May 17, 2019
Annual per share dividend rate (paid quarterly)	6.88%
Class Z Cumulative Preferred Stock
Classes of perpetual preferred stock
Preferred stock, redemption amount		34,800
Preferred stock redemption premium		700
Previously deferred issuance costs reflected as an adjustment of net income attributable to preferred security holders		$ 1,300
Series A Community Reinvestment Act Preferred Stock
Classes of perpetual preferred stock
Preferred stock, redemption amount			27,000
Previously deferred issuance costs reflected as an adjustment of net income attributable to preferred security holders			$ 700
Class A Common Stock
Classes of perpetual preferred stock
Dividends declared per common share/unit (dollars per share)	$ 1.44	$ 1.32	$ 1.18
Number of shares of stock issued (in shares)			9,430,000
Common stock, par value (dollars per share)			$ 0.01
Gross offering price per share of stock issued (dollar per share)			$ 38.90
Proceeds from issuance of Common Stock			$ 366,600

Partners' Capital - Schedule o

Partners' Capital - Schedule of Classes of Preferred OP Units (Details) - AIMCO PROPERTIES, L.P. - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Limited Partners' Capital Account [Line Items]
Perpetual partnership preferred units issued (in units)	3,822,336	3,888,879
Perpetual partnership preferred units outstanding (in units)	3,822,336	3,888,879
Perpetual partnership preferred units, redemption value	$ 101,537	$ 103,201
Class One
Limited Partners' Capital Account [Line Items]
Per annum distribution rate	8.75%
Distributions made to Limited Partner, distributions paid (dollars per unit)	$ 8
Perpetual partnership preferred units issued (in units)	90,000	90,000
Perpetual partnership preferred units outstanding (in units)	90,000	90,000
Perpetual partnership preferred units, redemption value	$ 8,229	$ 8,229
Class Two
Limited Partners' Capital Account [Line Items]
Per annum distribution rate	1.92%
Distributions made to Limited Partner, distributions paid (dollars per unit)	$ 0.48
Perpetual partnership preferred units issued (in units)	17,750	17,750
Perpetual partnership preferred units outstanding (in units)	17,750	17,750
Perpetual partnership preferred units, redemption value	$ 444	$ 444
Class Three
Limited Partners' Capital Account [Line Items]
Per annum distribution rate	7.88%
Distributions made to Limited Partner, distributions paid (dollars per unit)	$ 1.97
Perpetual partnership preferred units issued (in units)	1,338,524	1,341,289
Perpetual partnership preferred units outstanding (in units)	1,338,524	1,341,289
Perpetual partnership preferred units, redemption value	$ 33,462	$ 33,532
Class Four
Limited Partners' Capital Account [Line Items]
Per annum distribution rate	8.00%
Distributions made to Limited Partner, distributions paid (dollars per unit)	$ 2
Perpetual partnership preferred units issued (in units)	644,954	644,954
Perpetual partnership preferred units outstanding (in units)	644,954	644,954
Perpetual partnership preferred units, redemption value	$ 16,124	$ 16,124
Class Six
Limited Partners' Capital Account [Line Items]
Per annum distribution rate	8.50%
Distributions made to Limited Partner, distributions paid (dollars per unit)	$ 2.13
Perpetual partnership preferred units issued (in units)	780,036	780,036
Perpetual partnership preferred units outstanding (in units)	780,036	780,036
Perpetual partnership preferred units, redemption value	$ 19,501	$ 19,501
Class Seven
Limited Partners' Capital Account [Line Items]
Per annum distribution rate	7.87%
Distributions made to Limited Partner, distributions paid (dollars per unit)	$ 1.97
Perpetual partnership preferred units issued (in units)	27,960	27,960
Perpetual partnership preferred units outstanding (in units)	27,960	27,960
Perpetual partnership preferred units, redemption value	$ 699	$ 699
Class Nine
Limited Partners' Capital Account [Line Items]
Per annum distribution rate	6.00%
Distributions made to Limited Partner, distributions paid (dollars per unit)	$ 1.50
Perpetual partnership preferred units issued (in units)	243,112	306,890
Perpetual partnership preferred units outstanding (in units)	243,112	306,890
Perpetual partnership preferred units, redemption value	$ 6,078	$ 7,672
Class Ten
Limited Partners' Capital Account [Line Items]
Per annum distribution rate	6.00%
Distributions made to Limited Partner, distributions paid (dollars per unit)	$ 1.50
Perpetual partnership preferred units issued (in units)	680,000	680,000
Perpetual partnership preferred units outstanding (in units)	680,000	680,000
Perpetual partnership preferred units, redemption value	$ 17,000	$ 17,000

Partners' Capital - Narrative

Partners' Capital - Narrative (Details)	12 Months Ended
	Dec. 31, 2017$ / sharesshares	Dec. 31, 2016$ / sharesshares	Dec. 31, 2015$ / sharesshares
Related Party Transaction [Line Items]
Partners capital account, units, Aimco Common Stock conversion ratio	1
Dividends declared per common share/unit (dollars per share) | $ / shares	$ 1.44	$ 1.32	$ 1.18
High Performance Units
Related Party Transaction [Line Items]
Partners capital account, units, Aimco Common Stock conversion ratio	1
AIMCO PROPERTIES, L.P.
Related Party Transaction [Line Items]
Redeemable partnership preferred units redeemed for cash during period (in units) | shares	67,000	69,000	700
Dividends declared per common share/unit (dollars per share) | $ / shares	$ 1.44	$ 1.32	$ 1.18
Common OP Units redeemed in exchange for cash during period (in units) | shares	98,000	248,000	112,000

Partners' Capital - Reconcilia

Partners' Capital - Reconciliation of Preferred OP Units (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at January 1	$ 103,201
Balance at December 31	101,537	$ 103,201
AIMCO PROPERTIES, L.P.
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at January 1	103,201	87,926	$ 87,937
Preferred distributions	(7,764)	(7,239)	(6,943)
Redemption of preferred units and other	(1,664)	(1,725)	(11)
Issuance of preferred units	0	17,000	0
Net income	7,764	7,239	6,943
Balance at December 31	$ 101,537	$ 103,201	$ 87,926

Share-Based Compensation - Nar

Share-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total compensation cost recognized for stock options and restricted stock awards	$ 9.3	$ 8.6	$ 7.2
Total compensation cost capitalized for options and restricted stock awards	1.4	1	0.5
Total unvested compensation cost not yet recognized for options and restricted stock awards	$ 11.8
Weighted average period over which unvested compensation cost expected to be recognized	1 year 7 months
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vest period	4 years
Term of stock options	10 years
Requisite service period	4 years
Options outstanding, aggregate intrinsic value	$ 2.4
Options outstanding, weighted average remaining contractual term	7 years 11 months
Options exercisable, aggregate intrinsic value	$ 0.8
Options exercisable, weighted average remaining contractual term	6 years 8 months
Intrinsic value of stock options exercised	$ 7.1	$ 11.1	$ 5.5
Options granted, weighted average grant-date fair value (dollars per share)	$ 11.39	$ 9.94	$ 6.97
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vest period	4 years
Requisite service period	4 years
Aggregate fair value of shares that vested	$ 6	$ 7	$ 10.4
TSR Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
TSR restricted shares performance measurement period	3 years
Term of stock options	10 years
36 Months After Grant Date | TSR Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, TSR restricted stock	50.00%
48 Months After Grant Date | TSR Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, TSR restricted stock	50.00%
NAREIT Apartment Index | TSR Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted percentage of index used to compare to TSR	60.00%
MSCI US REIT Index | TSR Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted percentage of index used to compare to TSR	40.00%
2015 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available to be granted under plan (in shares)	0.4
Additional shares authorized under plan (in shares)	0.7

Share-Based Compensation - Sch

Share-Based Compensation - Schedule of Stock Option Activity (Details) - Employee Stock Option - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of options outstanding, beginning balance (in shares)	675	1,394	1,640
Number of options, granted (in shares)	184	216	239
Number of options, exercised (in shares)	(211)	(934)	(484)
Number of options, forfeited (in shares)	0	(1)	(1)
Number of options outstanding, ending balance (in shares)	648	675	1,394
Number of options exercisable at end of year (in shares)	128	280	1,155
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, beginning balance (in dollars per share)	$ 29.55	$ 30.85	$ 28.91
Weighted average exercise price options, granted (in dollars per share)	44.07	38.73	39.05
Weighted average exercise price options, exercised (in dollars per share)	9.90	33.61	28.33
Weighted average exercise price options, forfeited (in dollars per share)	0	29.11	25.78
Weighted average exercise price, ending balance (in dollars per share)	40.08	29.55	30.85
Weighted average exercise price, exercisable (in dollars per share)	$ 37.59	$ 16.38	$ 29.16

Share-Based Compensation - S63

Share-Based Compensation - Schedule of Restricted Stock Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of shares, Unvested at beginning of year (in shares)	249	339	513
Number of shares, Granted (in shares)	45	91	145
Number of shares, Vested (in shares)	(134)	(181)	(259)
Number of shares, Forfeited (in shares)	0	0	(60)
Number of shares, Unvested at end of year (in shares)	160	249	339
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant-date fair value, Unvested at beginning of year (in dollars per share)	$ 33.61	$ 29.96	$ 26.34
Weighted average grant-date fair value, Granted (in dollars per share)	44.07	40.03	39.39
Weighted average grant-date fair value, Vested (in dollars per share)	32.35	29.99	27.54
Weighted average grant date fair value, Forfeited (in dollars per share)	0	0	32.29
Weighted average grant-date fair value, Unvested at end of year (in dollars per share)	$ 37.63	$ 33.61	$ 29.96
TSR Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of shares, Unvested at beginning of year (in shares)	214	123	0
Number of shares, Granted (in shares)	39	91	142
Number of shares, Forfeited (in shares)	0	0	(19)
Number of shares, Unvested at end of year (in shares)	253	214	123
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant-date fair value, Unvested at beginning of year (in dollars per share)	$ 39.66	$ 39.72	$ 0
Weighted average grant-date fair value, Granted (in dollars per share)	46.39	39.59	39.72
Weighted average grant date fair value, Forfeited (in dollars per share)	0	0	39.72
Weighted average grant-date fair value, Unvested at end of year (in dollars per share)	$ 40.70	$ 39.66	$ 39.72
TSR LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of shares, Unvested at beginning of year (in shares)	0
Number of shares, Granted (in shares)	45
Number of shares, Unvested at end of year (in shares)	45	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant-date fair value, Unvested at beginning of year (in dollars per share)	$ 0
Weighted average grant-date fair value, Granted (in dollars per share)	46.21
Weighted average grant-date fair value, Unvested at end of year (in dollars per share)	$ 46.21	$ 0

Share-Based Compensation - Val

Share-Based Compensation - Valuation Assumptions (Details) - TSR Stock Awards - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date market value of a common share (dollars per share)	$ 44.07	$ 38.73	$ 39.05
Risk-free interest rate	1.57%	1.15%	1.04%
Expected dividend yield	3.27%	3.41%	2.87%
Expected volatility	21.33%	21.24%	19.48%
Derived vesting period of TSR Restricted Stock and TSR LTIP units	3 years 5 months	3 years 5 months	3 years 5 months
Weighted average expected term of options	5 years 9 months	5 years 9 months

Income Taxes - Components of D

Income Taxes - Components of Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax liabilities:
Real estate and real estate partnership basis differences	$ 32,032	$ 72,726
Deferred tax assets:
Net operating, capital and other loss carryforwards	9,523	8,873
Accruals and expenses	6,575	7,537
Tax credit carryforwards	73,450	65,559
Management contracts and other	200	300
Total deferred tax assets	89,748	82,269
Valuation allowance	(25,489)	(4,467)
Net deferred tax assets	$ 32,227	$ 5,076

Income Taxes - Reconciliation

Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of unrecognized tax benefits
Balance at January 1	$ 2,286	$ 2,897	$ 2,286
Additions (reductions) based on tax positions related to prior years	190	(611)	611
Balance at December 31	$ 2,476	$ 2,286	$ 2,897

Income Taxes - Components of I

Income Taxes - Components of Income Tax Benefit or Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal (1)	$ (938)	$ 5,038	$ 1,310
State	525	2,916	1,357
Total current	(413)	7,954	2,667
Deferred:
Federal	(10,908)	(26,173)	(27,382)
State	(3,621)	(623)	(1,052)
Revaluation of deferred taxes due to change in tax rate	(15,894)	0	0
Total deferred	(30,423)	(26,796)	(28,434)
Total benefit	(30,836)	(18,842)	(25,767)
Classification:
Income before gain on dispositions	(32,126)	(25,208)	(27,524)
Gain on dispositions of real estate	1,290	$ 6,366	$ 1,757
Reclassification of AMT credits from deferred tax assets to receivables	$ 2,700

Income Taxes - Reconciliatio68

Income Taxes - Reconciliation of Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of income tax attributable to continuing and discontinued operations
Tax (benefit) provision at United States statutory rates on consolidated income or loss subject to tax	$ (19,459)	$ 38,257	$ (10,947)
Tax at U.S. statutory rates on consolidated income or loss subject to tax, percentage	35.00%	35.00%	35.00%
State income tax expense, net of federal tax (benefit) expense	$ (1,769)	$ 7,152	$ (361)
State income tax expense (benefit), net of Federal tax (benefit), percentage	3.20%	6.50%	1.20%
Establishment of deferred tax asset related to partnership basis difference	$ (3,501)	$ 0	$ 0
Establishment of deferred tax asset related to partnership basis difference, percentage	6.30%	0.00%	0.00%
Effect of permanent differences	$ (1,629)	$ (132)	$ (27)
Effective income tax rate reconciliation, non deductible expense, percent	2.90%	(0.10%)	0.10%
Tax effect of intercompany transfers of assets between the REIT and TRS entities	$ 0	$ (47,369)	$ (1,515)
Tax effect of intercompany transfers of assets between the REIT and taxable REIT subsidiaries, percentage (1)	(0.00%)	(43.30%)	4.80%
Tax credits	$ (9,607)	$ (16,750)	$ (13,583)
Tax credits, percentage	17.30%	(15.30%)	43.40%
Tax reform revaluation	$ (15,894)	$ 0	$ 0
Tax reform revaluation, percentage	0.286	0	0
Increase in valuation allowance	$ 21,023	$ 0	$ 666
Increase in valuation allowance, percentage	(37.80%)	0.00%	(2.10%)
Total benefit	$ (30,836)	$ (18,842)	$ (25,767)
Reconciliation of income tax, percentage	55.50%	(17.20%)	82.40%
Tax Credit Carryforward [Line Items]
Valuation allowance against the deferred tax assets associated with rehabilitation tax credits due to lower federal tax rate under the 2017 Act	$ 25,489	$ 4,467
Low-Income Housing and Rehabilitation Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Valuation allowance against the deferred tax assets associated with rehabilitation tax credits due to lower federal tax rate under the 2017 Act	$ 15,400

Income Taxes - Schedule of Div

Income Taxes - Schedule of Dividends Per Share Held (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Dividends paid to holders of common stock
Ordinary income	$ 0.75	$ 0.45	$ 0.36
Ordinary income, percentage	51.50%	34.20%	30.20%
Capital gains	$ 0.51	$ 0.47	$ 0.37
Capital gains, percentage	35.70%	35.40%	31.30%
Qualified dividends	$ 0.02	$ 0.13	$ 0.17
Qualified dividends, percentage	1.60%	9.90%	14.50%
Unrecaptured Section 1250 gain	$ 0.16	$ 0.27	$ 0.28
Unrecaptured Section 1250 gain, percentage	11.20%	20.50%	24.00%
Dividends declared per common share/unit (dollars per share)	$ 1.44	$ 1.32	$ 1.18
Dividends declared per common share, percentage	100.00%	100.00%	100.00%

Income Taxes - Narrative (Deta

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes (Textual) [Abstract]
Net tax benefit estimate resulting from Tax Cuts and Jobs Act (2017 Act)	$ 15,900
Operating loss carryforwards	9,500
Valuation allowance	6,600
Net deferred tax asset related to tax credit carryforwards	73,500
Valuation allowance	25,489	$ 4,467
Real estate and real estate partnership basis difference attributable to La Jolla Cove impairment	4,400
Consolidated income (loss) subject to tax	(55,600)	109,300	$ (31,300)
Cash paid for income taxes	7,401	$ 2,152	$ 2,033
Low-Income Housing and Rehabilitation Tax Credit Carryforward
Income Taxes (Textual) [Abstract]
Valuation allowance	$ 15,400
Minimum
Income Taxes (Textual) [Abstract]
Expiration years of net operating loss carryforwards	Dec. 31, 2018
Tax credit carryforward, expiration date	Dec. 31, 2024
Maximum
Income Taxes (Textual) [Abstract]
Expiration years of net operating loss carryforwards	Dec. 31, 2033
Tax credit carryforward, expiration date	Dec. 31, 2037

Earnings per Share_Unit - Narr

Earnings per Share/Unit - Narrative (Details) - shares shares in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Participating securities outstanding (in shares)	0.2	0.2	0.3
Number of shares of common stock required to redeem preferred OP units tendered for redemption, if parent chooses to redeem in shares rather than cash (in shares)	2.3

Fair Value Measurements - Narr

Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Aimco Real Estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of consolidated debt	$ 3,900,000	$ 3,700,000
Total indebtedness associated with Real Estate portfolio	$ 3,861,770	3,648,206
Cash Flow Hedging
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Average remaining maturity of interest rate swaps	6 years
Period for reclassification into earnings	12 months
Amount of unrealized gains (losses) estimated to be reclassified from accumulated other comprehensive income to earnings during the next 12 months	$ 300
Weighted average fixed rate of interest rate swaps	3.26%
Available-for-sale Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Face amount of investment in available-for-sale debt securities	$ 100,900
Expected remaining term of available for sale securities	3 years 5 months
Amortized cost of the investment in available-for-sale debt securities	$ 77,700	72,500
Available-for-sale Securities | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage-backed securities available-for-sale, fair value disclosure	82,800	76,100
Interest Rate Swap | Cash Flow Hedging
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount of interest rate swaps	$ 22,000	$ 22,400

Fair Value Measurements - Summ

Fair Value Measurements - Summary of Changes in Fair Value in Interest Rate Swaps (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value of Assets and Liabilities Measured on a Recurring Basis Fair Value and Input Reconciliation [Roll Forward]
Unrealized (losses) gains included in equity and partners’ capital	$ (173)	$ 221	$ (1,299)
Interest Rate Swap | Fair Value, Inputs, Level 2
Fair Value of Assets and Liabilities Measured on a Recurring Basis Fair Value and Input Reconciliation [Roll Forward]
Beginning balance	(3,175)	(4,938)	(5,273)
Realized (unrealized) losses included in interest expense	73	(44)	(44)
Realized losses on derecognition of interest rate swaps included in earnings	273	0	0
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss	1,207	1,586	1,678
Unrealized (losses) gains included in equity and partners’ capital	(173)	221	(1,299)
Ending balance	$ (1,795)	$ (3,175)	$ (4,938)

Business Segments - Narrative

Business Segments - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)UnitsPropertySegment	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	1
Real Estate | Real Estate
Segment Reporting Information [Line Items]
Capital additions related to segments | $	$ 338	$ 321	$ 340.3
Wholly and Partially Owned And Consolidated Properties | Aimco Real Estate
Segment Reporting Information [Line Items]
Number of owned and managed apartment communities in segments | Property	132
Number of apartment homes | Units	36,762
Wholly and Partially Owned And Consolidated Properties | Asset Management
Segment Reporting Information [Line Items]
Number of owned and managed apartment communities in segments | Property	39
Number of apartment homes | Units	6,211
Unconsolidated Properties | Aimco Real Estate
Segment Reporting Information [Line Items]
Number of owned and managed apartment communities in segments | Property	4
Number of apartment homes | Units	142
Partially Owned Properties | Aimco Real Estate
Segment Reporting Information [Line Items]
Number of owned and managed apartment communities in segments | Property	136
Number of apartment homes | Units	36,904
Partially Owned Properties | Asset Management
Segment Reporting Information [Line Items]
Number of owned and managed apartment communities in segments | Property	46
Number of apartment homes | Units	6,898

Business Segments - Schedule o

Business Segments - Schedule of Revenues, Net Operating Income and Income Before Gain on Dispositions of Real Estate Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summary information for the reportable segments
Tax credit and transaction revenues									$ 13,243	$ 21,323	$ 24,356
Total revenues	$ 255,229	$ 254,635	$ 249,092	$ 246,481	$ 249,493	$ 248,904	$ 251,218	$ 246,239	1,005,437	995,854	981,310
Other operating expenses not allocated to reportable segment									457,075	394,145	362,979
Total operating expenses									811,454	749,058	725,095
Operating income	$ 17,283	$ 59,205	$ 59,706	$ 57,789	$ 60,094	$ 58,732	$ 64,436	$ 63,534	193,983	246,796	256,215
Other items included in income before gain on dispositions									(146,463)	(157,313)	(164,825)
Income before gain on dispositions									47,520	89,483	91,390
Asset Management
Summary information for the reportable segments
Rental and other property revenues									74,046	74,640	73,934
Property operating expenses									35,440	36,956	37,537
Aimco Real Estate
Summary information for the reportable segments
Rental and other property revenues									918,148	899,891	883,020
Property operating expenses									318,939	317,957	324,579
Real Estate | Aimco Real Estate
Summary information for the reportable segments
Rental and other property revenues									854,491	791,587	737,079
Total revenues									854,491	791,587	737,079
Property operating expenses									265,186	251,636	240,789
Total operating expenses									265,186	251,636	240,789
Operating income									589,305	539,951	496,290
Income before gain on dispositions									589,305	539,951	496,290
Real Estate | Aimco Real Estate | Asset Management
Summary information for the reportable segments
Rental and other property revenues									0	0	0
Property operating expenses									0	0	0
Proportionate Adjustments
Summary information for the reportable segments
Total revenues									15,481	28,509	28,875
Total operating expenses									4,887	8,284	8,857
Operating income									10,594	20,225	20,018
Income before gain on dispositions									10,594	20,225	20,018
Proportionate Adjustments | Aimco Real Estate
Summary information for the reportable segments
Rental and other property revenues									15,481	28,509	28,875
Property operating expenses									4,887	8,284	8,857
Corporate and Amounts Not Allocated to Reportable Segment
Summary information for the reportable segments
Tax credit and transaction revenues									13,243	21,323	24,356
Total revenues									135,465	175,758	215,356
Other operating expenses not allocated to reportable segment									457,075	394,145	362,979
Total operating expenses									541,381	489,138	475,449
Operating income									(405,916)	(313,380)	(260,093)
Other items included in income before gain on dispositions									(146,463)	(157,313)	(164,825)
Income before gain on dispositions									(552,379)	(470,693)	(424,918)
Corporate and Amounts Not Allocated to Reportable Segment | Asset Management
Summary information for the reportable segments
Rental and other property revenues									74,046	74,640	73,934
Property operating expenses									35,440	36,956	37,537
Corporate and Amounts Not Allocated to Reportable Segment | Aimco Real Estate
Summary information for the reportable segments
Rental and other property revenues									48,176	79,795	117,066
Property operating expenses									$ 48,866	$ 58,037	$ 74,933

Business Segments - Schedule76

Business Segments - Schedule of Reportable Segment Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 6,079,040	$ 6,232,818
Real Estate | Aimco Real Estate
Segment Reporting Information [Line Items]
Total assets	5,495,069	5,432,642
Corporate and Amounts Not Allocated to Reportable Segment
Segment Reporting Information [Line Items]
Total assets	$ 583,971	$ 800,176

Variable Interest Entities - S

Variable Interest Entities - Summary of Consolidated VIEs (Details) - Variable Interest Entity, Primary Beneficiary	Dec. 31, 2017UnitsPropertyEntity	Dec. 31, 2016UnitsPropertyEntity
Aimco Real Estate
Variable Interest Entity [Line Items]
VIEs with interests in apartment communities | Entity	14	17
Number of apartment communities | Property	14	19
Number of apartment homes | Units	4,321	6,110
Asset Management
Variable Interest Entity [Line Items]
VIEs with interests in apartment communities | Entity	49	50
Number of apartment communities | Property	37	38
Number of apartment homes | Units	5,893	6,093

Variable Interest Entities -78

Variable Interest Entities - Summary of Assets and Liabilities of VIEs (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Cash and cash equivalents	$ 76,786	$ 61,244	$ 50,789	$ 28,971
Aimco Real Estate | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Net real estate	529,898	897,510
Cash and cash equivalents	16,111	15,877
Restricted cash	4,798	7,981
Non-recourse property debt	412,205	725,061
Accrued liabilities and other	10,623	14,270
Asset Management | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Net real estate	215,580	235,920
Cash and cash equivalents	15,931	14,926
Restricted cash	30,107	32,542
Non-recourse property debt	220,356	229,509
Accrued liabilities and other	$ 20,241	$ 16,934

Unaudited Summarized Consolid79

Unaudited Summarized Consolidated Quarterly Information - Summary of Unaudited Consolidated Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summarized unaudited consolidated quarterly information
Total revenues	$ 255,229	$ 254,635	$ 249,092	$ 246,481	$ 249,493	$ 248,904	$ 251,218	$ 246,239	$ 1,005,437	$ 995,854	$ 981,310
Operating income	17,283	59,205	59,706	57,789	60,094	58,732	64,436	63,534	193,983	246,796	256,215
Net income	286,189	22,144	21,591	17,155	177,399	30,036	245,953	29,885	347,079	483,273	271,983
Net income attributable to Aimco common stockholders	$ 262,097	$ 17,430	$ 15,843	$ 11,491	$ 162,000	$ 11,176	$ 221,382	$ 23,223	$ 306,861	$ 417,781	$ 235,966
Earnings attributable to the company per common share/unit:
Net income attributable to the company per common share/unit - basic (in dollars per share)	$ 1.68	$ 0.11	$ 0.10	$ 0.07	$ 1.04	$ 0.07	$ 1.42	$ 0.15	$ 1.96	$ 2.68	$ 1.52
Net income attributable to the company per common share/unit - diluted (in dollars per share)	$ 1.67	$ 0.11	$ 0.10	$ 0.07	$ 1.03	$ 0.07	$ 1.41	$ 0.15	$ 1.96	$ 2.67	$ 1.52
AIMCO PROPERTIES, L.P.
Summarized unaudited consolidated quarterly information
Total revenues	$ 255,229	$ 254,635	$ 249,092	$ 246,481	$ 249,493	$ 248,904	$ 251,218	$ 246,239
Operating income	17,283	59,205	59,706	57,789	60,094	58,732	64,436	63,534
Net income	286,189	22,144	21,591	17,155	177,399	30,036	245,953	29,885
Net income attributable to Aimco common stockholders	$ 274,380	$ 18,246	$ 16,627	$ 12,047	$ 169,869	$ 11,368	$ 232,517	$ 24,395
Earnings attributable to the company per common share/unit:
Net income attributable to the company per common share/unit - basic (in dollars per share)	$ 1.68	$ 0.11	$ 0.10	$ 0.07	$ 1.04	$ 0.07	$ 1.42	$ 0.15
Net income attributable to the company per common share/unit - diluted (in dollars per share)	$ 1.67	$ 0.11	$ 0.10	$ 0.07	$ 1.03	$ 0.07	$ 1.41	$ 0.15

Real Estate and Accumulated D80

Real Estate and Accumulated Depreciation - Schedule of Real Estate and Accumulated Depreciation (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)Units	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Real Estate and Accumulated Depreciation (Textual) [Abstract]
Aggregate cost of land and depreciable property for federal income tax purposes	$ 3,700,000
Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Number of apartment homes | Units	42,460
Initial Cost, Land	$ 1,912,431
Initial Cost, Buildings and Improvements	3,499,164
Costs Capitalized Subsequent to Consolidation	3,192,638
Land	1,787,075
Buildings and Improvements	6,691,802
Total	8,478,877
Accumulated Depreciation (AD)	(2,848,609)
Total Cost Net of Accumulated Depreciation	5,630,268
Encumbrances	3,794,415
Asset Management
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Total	551,124	$ 555,049	$ 562,589	$ 567,927
Accumulated Depreciation (AD)	$ (326,251)	(309,401)	(289,574)	(278,887)
Asset Management | Arvada House | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Nov. 1, 2004
Location	Arvada, CO
Year Built	Jan. 1, 1977
Number of apartment homes | Units	88
Initial Cost, Land	$ 405
Initial Cost, Buildings and Improvements	3,314
Costs Capitalized Subsequent to Consolidation	2,475
Land	405
Buildings and Improvements	5,789
Total	6,194
Accumulated Depreciation (AD)	(3,174)
Total Cost Net of Accumulated Depreciation	3,020
Encumbrances	$ 3,806
Asset Management | Beacon Hill | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Mar. 1, 2002
Location	Hillsdale, MI
Year Built	Jan. 1, 1980
Number of apartment homes | Units	198
Initial Cost, Land	$ 1,094
Initial Cost, Buildings and Improvements	7,044
Costs Capitalized Subsequent to Consolidation	6,271
Land	1,094
Buildings and Improvements	13,315
Total	14,409
Accumulated Depreciation (AD)	(7,607)
Total Cost Net of Accumulated Depreciation	6,802
Encumbrances	$ 6,512
Asset Management | Biltmore Towers | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Mar. 1, 2002
Location	Dayton, OH
Year Built	Jan. 1, 1980
Number of apartment homes | Units	230
Initial Cost, Land	$ 1,814
Initial Cost, Buildings and Improvements	6,411
Costs Capitalized Subsequent to Consolidation	13,688
Land	1,814
Buildings and Improvements	20,099
Total	21,913
Accumulated Depreciation (AD)	(14,027)
Total Cost Net of Accumulated Depreciation	7,886
Encumbrances	$ 9,863
Asset Management | Butternut Creek | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Jan. 1, 2006
Location	Charlotte, MI
Year Built	Jan. 1, 1980
Number of apartment homes | Units	100
Initial Cost, Land	$ 505
Initial Cost, Buildings and Improvements	3,617
Costs Capitalized Subsequent to Consolidation	4,163
Land	505
Buildings and Improvements	7,780
Total	8,285
Accumulated Depreciation (AD)	(6,461)
Total Cost Net of Accumulated Depreciation	1,824
Encumbrances	$ 4,042
Asset Management | Carriage House | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Dec. 1, 2006
Location	Petersburg, VA
Year Built	Jan. 1, 1885
Number of apartment homes | Units	118
Initial Cost, Land	$ 716
Initial Cost, Buildings and Improvements	2,886
Costs Capitalized Subsequent to Consolidation	4,173
Land	716
Buildings and Improvements	7,059
Total	7,775
Accumulated Depreciation (AD)	(4,390)
Total Cost Net of Accumulated Depreciation	3,385
Encumbrances	$ 1,767
Asset Management | Copperwood Apartments I | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Apr. 1, 2006
Location	The Woodlands, TX
Year Built	Jan. 1, 1980
Number of apartment homes | Units	150
Initial Cost, Land	$ 383
Initial Cost, Buildings and Improvements	8,373
Costs Capitalized Subsequent to Consolidation	6,182
Land	383
Buildings and Improvements	14,555
Total	14,938
Accumulated Depreciation (AD)	(12,789)
Total Cost Net of Accumulated Depreciation	2,149
Encumbrances	$ 4,969
Asset Management | Copperwood Apartments II | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Oct. 1, 2005
Location	The Woodlands, TX
Year Built	Jan. 1, 1981
Number of apartment homes | Units	150
Initial Cost, Land	$ 459
Initial Cost, Buildings and Improvements	5,553
Costs Capitalized Subsequent to Consolidation	3,890
Land	459
Buildings and Improvements	9,443
Total	9,902
Accumulated Depreciation (AD)	(6,160)
Total Cost Net of Accumulated Depreciation	3,742
Encumbrances	$ 5,126
Asset Management | Country Club Heights | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2004
Location	Quincy, IL
Year Built	Jan. 1, 1976
Number of apartment homes | Units	200
Initial Cost, Land	$ 676
Initial Cost, Buildings and Improvements	5,715
Costs Capitalized Subsequent to Consolidation	5,444
Land	676
Buildings and Improvements	11,159
Total	11,835
Accumulated Depreciation (AD)	(6,957)
Total Cost Net of Accumulated Depreciation	4,878
Encumbrances	$ 5,252
Asset Management | Crevenna Oaks | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Town Home
Date Consolidated	Jan. 1, 2006
Location	Burke, VA
Year Built	Jan. 1, 1979
Number of apartment homes | Units	50
Initial Cost, Land	$ 0
Initial Cost, Buildings and Improvements	5,203
Costs Capitalized Subsequent to Consolidation	616
Land	0
Buildings and Improvements	5,819
Total	5,819
Accumulated Depreciation (AD)	(3,686)
Total Cost Net of Accumulated Depreciation	2,133
Encumbrances	$ 2,136
Asset Management | Fountain Place | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Jan. 1, 2006
Location	Connersville, IN
Year Built	Jan. 1, 1980
Number of apartment homes | Units	102
Initial Cost, Land	$ 378
Initial Cost, Buildings and Improvements	2,091
Costs Capitalized Subsequent to Consolidation	3,427
Land	378
Buildings and Improvements	5,518
Total	5,896
Accumulated Depreciation (AD)	(2,725)
Total Cost Net of Accumulated Depreciation	3,171
Encumbrances	$ 816
Asset Management | Hopkins Village | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Sep. 1, 2003
Location	Baltimore, MD
Year Built	Jan. 1, 1979
Number of apartment homes | Units	165
Initial Cost, Land	$ 549
Initial Cost, Buildings and Improvements	5,973
Costs Capitalized Subsequent to Consolidation	3,527
Land	549
Buildings and Improvements	9,500
Total	10,049
Accumulated Depreciation (AD)	(4,799)
Total Cost Net of Accumulated Depreciation	5,250
Encumbrances	$ 9,100
Asset Management | Ingram Square | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jan. 1, 2006
Location	San Antonio, TX
Year Built	Jan. 1, 1980
Number of apartment homes | Units	120
Initial Cost, Land	$ 800
Initial Cost, Buildings and Improvements	3,136
Costs Capitalized Subsequent to Consolidation	6,057
Land	800
Buildings and Improvements	9,193
Total	9,993
Accumulated Depreciation (AD)	(6,468)
Total Cost Net of Accumulated Depreciation	3,525
Encumbrances	$ 2,980
Asset Management | Kirkwood House | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Sep. 1, 2004
Location	Baltimore, MD
Year Built	Jan. 1, 1979
Number of apartment homes | Units	261
Initial Cost, Land	$ 1,337
Initial Cost, Buildings and Improvements	9,358
Costs Capitalized Subsequent to Consolidation	9,572
Land	1,337
Buildings and Improvements	18,930
Total	20,267
Accumulated Depreciation (AD)	(10,453)
Total Cost Net of Accumulated Depreciation	9,814
Encumbrances	$ 16,000
Asset Management | La Vista | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jan. 1, 2006
Location	Concord, CA
Year Built	Jan. 1, 1981
Number of apartment homes | Units	75
Initial Cost, Land	$ 581
Initial Cost, Buildings and Improvements	4,449
Costs Capitalized Subsequent to Consolidation	4,835
Land	581
Buildings and Improvements	9,284
Total	9,865
Accumulated Depreciation (AD)	(4,793)
Total Cost Net of Accumulated Depreciation	5,072
Encumbrances	$ 4,723
Asset Management | Loring Towers | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Oct. 1, 2002
Location	Minneapolis, MN
Year Built	Jan. 1, 1975
Number of apartment homes | Units	230
Initial Cost, Land	$ 886
Initial Cost, Buildings and Improvements	7,445
Costs Capitalized Subsequent to Consolidation	9,213
Land	886
Buildings and Improvements	16,658
Total	17,544
Accumulated Depreciation (AD)	(9,269)
Total Cost Net of Accumulated Depreciation	8,275
Encumbrances	$ 9,225
Asset Management | Loring Towers Apartments | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Sep. 1, 2003
Location	Salem, MA
Year Built	Jan. 1, 1973
Number of apartment homes | Units	250
Initial Cost, Land	$ 187
Initial Cost, Buildings and Improvements	14,050
Costs Capitalized Subsequent to Consolidation	8,738
Land	187
Buildings and Improvements	22,788
Total	22,975
Accumulated Depreciation (AD)	(12,437)
Total Cost Net of Accumulated Depreciation	10,538
Encumbrances	$ 9,622
Asset Management | New Baltimore | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Mar. 1, 2002
Location	New Baltimore, MI
Year Built	Jan. 1, 1980
Number of apartment homes | Units	101
Initial Cost, Land	$ 896
Initial Cost, Buildings and Improvements	2,360
Costs Capitalized Subsequent to Consolidation	5,404
Land	896
Buildings and Improvements	7,764
Total	8,660
Accumulated Depreciation (AD)	(4,999)
Total Cost Net of Accumulated Depreciation	3,661
Encumbrances	$ 1,887
Asset Management | Northpoint | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jan. 1, 2000
Location	Chicago, IL
Year Built	Jan. 1, 1921
Number of apartment homes | Units	304
Initial Cost, Land	$ 2,510
Initial Cost, Buildings and Improvements	14,334
Costs Capitalized Subsequent to Consolidation	16,358
Land	2,510
Buildings and Improvements	30,692
Total	33,202
Accumulated Depreciation (AD)	(23,479)
Total Cost Net of Accumulated Depreciation	9,723
Encumbrances	$ 17,170
Asset Management | Panorama Park | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2002
Location	Bakersfield, CA
Year Built	Jan. 1, 1982
Number of apartment homes | Units	66
Initial Cost, Land	$ 521
Initial Cost, Buildings and Improvements	5,520
Costs Capitalized Subsequent to Consolidation	1,324
Land	521
Buildings and Improvements	6,844
Total	7,365
Accumulated Depreciation (AD)	(4,299)
Total Cost Net of Accumulated Depreciation	3,066
Encumbrances	$ 1,558
Asset Management | Park Place | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Jun. 1, 2005
Location	St Louis, MO
Year Built	Jan. 1, 1977
Number of apartment homes | Units	242
Initial Cost, Land	$ 705
Initial Cost, Buildings and Improvements	6,327
Costs Capitalized Subsequent to Consolidation	8,557
Land	705
Buildings and Improvements	14,884
Total	15,589
Accumulated Depreciation (AD)	(11,702)
Total Cost Net of Accumulated Depreciation	3,887
Encumbrances	$ 8,065
Asset Management | Parkways, The | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jun. 1, 2004
Location	Chicago, IL
Year Built	Jan. 1, 1925
Number of apartment homes | Units	446
Initial Cost, Land	$ 3,426
Initial Cost, Buildings and Improvements	23,257
Costs Capitalized Subsequent to Consolidation	23,186
Land	3,426
Buildings and Improvements	46,443
Total	49,869
Accumulated Depreciation (AD)	(29,364)
Total Cost Net of Accumulated Depreciation	20,505
Encumbrances	$ 14,892
Asset Management | Pleasant Hills | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Apr. 1, 2005
Location	Austin, TX
Year Built	Jan. 1, 1982
Number of apartment homes | Units	100
Initial Cost, Land	$ 1,229
Initial Cost, Buildings and Improvements	2,631
Costs Capitalized Subsequent to Consolidation	4,322
Land	1,229
Buildings and Improvements	6,953
Total	8,182
Accumulated Depreciation (AD)	(4,581)
Total Cost Net of Accumulated Depreciation	3,601
Encumbrances	$ 2,841
Asset Management | Plummer Village | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Mar. 1, 2002
Location	North Hills, CA
Year Built	Jan. 1, 1983
Number of apartment homes | Units	75
Initial Cost, Land	$ 666
Initial Cost, Buildings and Improvements	2,647
Costs Capitalized Subsequent to Consolidation	1,394
Land	666
Buildings and Improvements	4,041
Total	4,707
Accumulated Depreciation (AD)	(3,069)
Total Cost Net of Accumulated Depreciation	1,638
Encumbrances	$ 2,226
Asset Management | Riverwoods | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Jan. 1, 2006
Location	Kankakee, IL
Year Built	Jan. 1, 1983
Number of apartment homes | Units	125
Initial Cost, Land	$ 598
Initial Cost, Buildings and Improvements	4,931
Costs Capitalized Subsequent to Consolidation	3,834
Land	598
Buildings and Improvements	8,765
Total	9,363
Accumulated Depreciation (AD)	(4,467)
Total Cost Net of Accumulated Depreciation	4,896
Encumbrances	$ 3,412
Asset Management | Round Barn Manor | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2002
Location	Champaign, IL
Year Built	Jan. 1, 1979
Number of apartment homes | Units	156
Initial Cost, Land	$ 810
Initial Cost, Buildings and Improvements	5,134
Costs Capitalized Subsequent to Consolidation	6,086
Land	810
Buildings and Improvements	11,220
Total	12,030
Accumulated Depreciation (AD)	(5,222)
Total Cost Net of Accumulated Depreciation	6,808
Encumbrances	$ 3,774
Asset Management | San Jose Apartments | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Sep. 1, 2005
Location	San Antonio, TX
Year Built	Jan. 1, 1970
Number of apartment homes | Units	220
Initial Cost, Land	$ 234
Initial Cost, Buildings and Improvements	5,770
Costs Capitalized Subsequent to Consolidation	12,543
Land	234
Buildings and Improvements	18,313
Total	18,547
Accumulated Depreciation (AD)	(11,656)
Total Cost Net of Accumulated Depreciation	6,891
Encumbrances	$ 4,154
Asset Management | San Juan Del Centro | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Sep. 1, 2005
Location	Boulder, CO
Year Built	Jan. 1, 1971
Number of apartment homes | Units	150
Initial Cost, Land	$ 439
Initial Cost, Buildings and Improvements	7,110
Costs Capitalized Subsequent to Consolidation	12,694
Land	439
Buildings and Improvements	19,804
Total	20,243
Accumulated Depreciation (AD)	(12,108)
Total Cost Net of Accumulated Depreciation	8,135
Encumbrances	$ 11,389
Asset Management | South Bay Villa | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2002
Location	Los Angeles, CA
Year Built	Jan. 1, 1981
Number of apartment homes | Units	80
Initial Cost, Land	$ 1,352
Initial Cost, Buildings and Improvements	2,770
Costs Capitalized Subsequent to Consolidation	3,944
Land	1,352
Buildings and Improvements	6,714
Total	8,066
Accumulated Depreciation (AD)	(5,716)
Total Cost Net of Accumulated Depreciation	2,350
Encumbrances	$ 2,622
Asset Management | Summit Oaks | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Town Home
Date Consolidated	Jan. 1, 2006
Location	Burke, VA
Year Built	Jan. 1, 1980
Number of apartment homes | Units	50
Initial Cost, Land	$ 0
Initial Cost, Buildings and Improvements	5,311
Costs Capitalized Subsequent to Consolidation	631
Land	0
Buildings and Improvements	5,942
Total	5,942
Accumulated Depreciation (AD)	(3,571)
Total Cost Net of Accumulated Depreciation	2,371
Encumbrances	$ 2,113
Asset Management | Tamarac Pines Apartments I | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Nov. 1, 2004
Location	Woodlands, TX
Year Built	Jan. 1, 1980
Number of apartment homes | Units	144
Initial Cost, Land	$ 363
Initial Cost, Buildings and Improvements	2,775
Costs Capitalized Subsequent to Consolidation	3,828
Land	363
Buildings and Improvements	6,603
Total	6,966
Accumulated Depreciation (AD)	(4,287)
Total Cost Net of Accumulated Depreciation	2,679
Encumbrances	$ 3,483
Asset Management | Tamarac Pines Apartments II | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Nov. 1, 2004
Location	Woodlands, TX
Year Built	Jan. 1, 1980
Number of apartment homes | Units	156
Initial Cost, Land	$ 266
Initial Cost, Buildings and Improvements	3,195
Costs Capitalized Subsequent to Consolidation	4,363
Land	266
Buildings and Improvements	7,558
Total	7,824
Accumulated Depreciation (AD)	(4,863)
Total Cost Net of Accumulated Depreciation	2,961
Encumbrances	$ 3,774
Asset Management | Terry Manor | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Oct. 1, 2005
Location	Los Angeles, CA
Year Built	Jan. 1, 1977
Number of apartment homes | Units	170
Initial Cost, Land	$ 1,997
Initial Cost, Buildings and Improvements	5,848
Costs Capitalized Subsequent to Consolidation	5,441
Land	1,997
Buildings and Improvements	11,289
Total	13,286
Accumulated Depreciation (AD)	(9,346)
Total Cost Net of Accumulated Depreciation	3,940
Encumbrances	$ 5,960
Asset Management | Tompkins Terrace | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Oct. 1, 2002
Location	Beacon, NY
Year Built	Jan. 1, 1974
Number of apartment homes | Units	193
Initial Cost, Land	$ 872
Initial Cost, Buildings and Improvements	6,827
Costs Capitalized Subsequent to Consolidation	14,918
Land	872
Buildings and Improvements	21,745
Total	22,617
Accumulated Depreciation (AD)	(12,629)
Total Cost Net of Accumulated Depreciation	9,988
Encumbrances	$ 6,318
Asset Management | Van Nuys Apartments | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Mar. 1, 2002
Location	Los Angeles, CA
Year Built	Jan. 1, 1981
Number of apartment homes | Units	299
Initial Cost, Land	$ 3,576
Initial Cost, Buildings and Improvements	21,226
Costs Capitalized Subsequent to Consolidation	23,955
Land	3,576
Buildings and Improvements	45,181
Total	48,757
Accumulated Depreciation (AD)	(23,501)
Total Cost Net of Accumulated Depreciation	25,256
Encumbrances	$ 23,531
Asset Management | Walnut Hills | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Jan. 1, 2006
Location	Cincinnati, OH
Year Built	Jan. 1, 1983
Number of apartment homes | Units	198
Initial Cost, Land	$ 820
Initial Cost, Buildings and Improvements	5,608
Costs Capitalized Subsequent to Consolidation	6,000
Land	820
Buildings and Improvements	11,608
Total	12,428
Accumulated Depreciation (AD)	(6,847)
Total Cost Net of Accumulated Depreciation	5,581
Encumbrances	$ 4,799
Asset Management | Washington Square West | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Sep. 1, 2004
Location	Philadelphia, PA
Year Built	Jan. 1, 1982
Number of apartment homes | Units	132
Initial Cost, Land	$ 582
Initial Cost, Buildings and Improvements	11,169
Costs Capitalized Subsequent to Consolidation	5,479
Land	582
Buildings and Improvements	16,648
Total	17,230
Accumulated Depreciation (AD)	(12,146)
Total Cost Net of Accumulated Depreciation	5,084
Encumbrances	$ 3,298
Asset Management | Whitefield Place | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Apr. 1, 2005
Location	San Antonio, TX
Year Built	Jan. 1, 1980
Number of apartment homes | Units	80
Initial Cost, Land	$ 219
Initial Cost, Buildings and Improvements	3,151
Costs Capitalized Subsequent to Consolidation	2,445
Land	219
Buildings and Improvements	5,596
Total	5,815
Accumulated Depreciation (AD)	(3,681)
Total Cost Net of Accumulated Depreciation	2,134
Encumbrances	$ 1,932
Asset Management | Winter Gardens | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Mar. 1, 2004
Location	St Louis, MO
Year Built	Jan. 1, 1920
Number of apartment homes | Units	112
Initial Cost, Land	$ 300
Initial Cost, Buildings and Improvements	3,072
Costs Capitalized Subsequent to Consolidation	4,973
Land	300
Buildings and Improvements	8,045
Total	8,345
Accumulated Depreciation (AD)	(3,261)
Total Cost Net of Accumulated Depreciation	5,084
Encumbrances	$ 3,132
Asset Management | Woodland Hills | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Oct. 1, 2005
Location	Jackson, MI
Year Built	Jan. 1, 1980
Number of apartment homes | Units	125
Initial Cost, Land	$ 320
Initial Cost, Buildings and Improvements	3,875
Costs Capitalized Subsequent to Consolidation	4,237
Land	320
Buildings and Improvements	8,112
Total	8,432
Accumulated Depreciation (AD)	(5,262)
Total Cost Net of Accumulated Depreciation	3,170
Encumbrances	$ 3,105
Asset Management | Asset Management Properties [Member] | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Number of apartment homes | Units	6,211
Initial Cost, Land	$ 33,471
Initial Cost, Buildings and Improvements	249,466
Costs Capitalized Subsequent to Consolidation	268,187
Land	33,471
Buildings and Improvements	517,653
Total	551,124
Accumulated Depreciation (AD)	(326,251)
Total Cost Net of Accumulated Depreciation	224,873
Encumbrances	231,374
Aimco Real Estate
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Total	7,927,753	7,931,117	7,744,894	7,577,031
Accumulated Depreciation (AD)	$ (2,522,358)	$ (2,421,357)	$ (2,488,448)	$ (2,393,292)
Aimco Real Estate | Real Estate Segment: | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Number of apartment homes | Units	36,249
Initial Cost, Land	$ 1,878,960
Initial Cost, Buildings and Improvements	3,249,698
Costs Capitalized Subsequent to Consolidation	2,924,451
Land	1,753,604
Buildings and Improvements	6,174,149
Total	7,927,753
Accumulated Depreciation (AD)	(2,522,358)
Total Cost Net of Accumulated Depreciation	5,405,395
Encumbrances	$ 3,563,041
Aimco Real Estate | 100 Forest Place | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Dec. 1, 1997
Location	Oak Park, IL
Year Built	Jan. 1, 1987
Number of apartment homes | Units	234
Initial Cost, Land	$ 2,664
Initial Cost, Buildings and Improvements	18,815
Costs Capitalized Subsequent to Consolidation	9,965
Land	2,664
Buildings and Improvements	28,780
Total	31,444
Accumulated Depreciation (AD)	(14,718)
Total Cost Net of Accumulated Depreciation	16,726
Encumbrances	$ 0
Aimco Real Estate | 118-122 West 23rd Street | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Jun. 1, 2012
Location	New York, NY
Year Built	Jan. 1, 1987
Number of apartment homes | Units	42
Initial Cost, Land	$ 14,985
Initial Cost, Buildings and Improvements	23,459
Costs Capitalized Subsequent to Consolidation	6,520
Land	14,985
Buildings and Improvements	29,979
Total	44,964
Accumulated Depreciation (AD)	(7,532)
Total Cost Net of Accumulated Depreciation	37,432
Encumbrances	$ 17,897
Aimco Real Estate | 173 E. 90th Street | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	May 1, 2004
Location	New York, NY
Year Built	Jan. 1, 1910
Number of apartment homes | Units	72
Initial Cost, Land	$ 12,066
Initial Cost, Buildings and Improvements	4,535
Costs Capitalized Subsequent to Consolidation	7,725
Land	12,066
Buildings and Improvements	12,260
Total	24,326
Accumulated Depreciation (AD)	(2,893)
Total Cost Net of Accumulated Depreciation	21,433
Encumbrances	$ 6,783
Aimco Real Estate | 182-188 Columbus Avenue | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Feb. 1, 2007
Location	New York, NY
Year Built	Jan. 1, 1910
Number of apartment homes | Units	32
Initial Cost, Land	$ 19,123
Initial Cost, Buildings and Improvements	3,300
Costs Capitalized Subsequent to Consolidation	5,282
Land	19,123
Buildings and Improvements	8,582
Total	27,705
Accumulated Depreciation (AD)	(3,371)
Total Cost Net of Accumulated Depreciation	24,334
Encumbrances	$ 14,204
Aimco Real Estate | 1045 on the Park Apartments Homes | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Jul. 1, 2013
Location	Atlanta, GA
Year Built	Jan. 1, 2012
Number of apartment homes | Units	30
Initial Cost, Land	$ 2,793
Initial Cost, Buildings and Improvements	6,662
Costs Capitalized Subsequent to Consolidation	600
Land	2,793
Buildings and Improvements	7,262
Total	10,055
Accumulated Depreciation (AD)	(1,116)
Total Cost Net of Accumulated Depreciation	8,939
Encumbrances	$ 5,750
Aimco Real Estate | 1582 First Avenue | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Mar. 1, 2005
Location	New York, NY
Year Built	Jan. 1, 1900
Number of apartment homes | Units	17
Initial Cost, Land	$ 4,281
Initial Cost, Buildings and Improvements	752
Costs Capitalized Subsequent to Consolidation	508
Land	4,281
Buildings and Improvements	1,260
Total	5,541
Accumulated Depreciation (AD)	(506)
Total Cost Net of Accumulated Depreciation	5,035
Encumbrances	$ 2,319
Aimco Real Estate | 21 Fitzsimons | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid-Rise
Date Consolidated	Aug. 1, 2014
Location	Aurora, CO
Year Built	Jan. 1, 2008
Number of apartment homes | Units	600
Initial Cost, Land	$ 12,864
Initial Cost, Buildings and Improvements	104,720
Costs Capitalized Subsequent to Consolidation	16,930
Land	12,864
Buildings and Improvements	121,650
Total	134,514
Accumulated Depreciation (AD)	(13,639)
Total Cost Net of Accumulated Depreciation	120,875
Encumbrances	$ 47,097
Aimco Real Estate | 234 East 88th Street | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid-Rise
Date Consolidated	Jan. 1, 2014
Location	New York, NY
Year Built	Jan. 1, 1900
Number of apartment homes | Units	20
Initial Cost, Land	$ 2,448
Initial Cost, Buildings and Improvements	4,449
Costs Capitalized Subsequent to Consolidation	755
Land	2,448
Buildings and Improvements	5,204
Total	7,652
Accumulated Depreciation (AD)	(875)
Total Cost Net of Accumulated Depreciation	6,777
Encumbrances	$ 3,296
Aimco Real Estate | 236-238 East 88th Street | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Jan. 1, 2004
Location	New York, NY
Year Built	Jan. 1, 1900
Number of apartment homes | Units	43
Initial Cost, Land	$ 8,820
Initial Cost, Buildings and Improvements	2,914
Costs Capitalized Subsequent to Consolidation	2,051
Land	8,820
Buildings and Improvements	4,965
Total	13,785
Accumulated Depreciation (AD)	(1,835)
Total Cost Net of Accumulated Depreciation	11,950
Encumbrances	$ 11,122
Aimco Real Estate | 237-239 Ninth Avenue | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Mar. 1, 2005
Location	New York, NY
Year Built	Jan. 1, 1900
Number of apartment homes | Units	36
Initial Cost, Land	$ 8,495
Initial Cost, Buildings and Improvements	1,866
Costs Capitalized Subsequent to Consolidation	3,235
Land	8,495
Buildings and Improvements	5,101
Total	13,596
Accumulated Depreciation (AD)	(2,428)
Total Cost Net of Accumulated Depreciation	11,168
Encumbrances	$ 5,664
Aimco Real Estate | 240 West 73rd Street, LLC | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Sep. 1, 2004
Location	New York, NY
Year Built	Jan. 1, 1900
Number of apartment homes | Units	200
Initial Cost, Land	$ 68,109
Initial Cost, Buildings and Improvements	12,140
Costs Capitalized Subsequent to Consolidation	11,586
Land	68,109
Buildings and Improvements	23,726
Total	91,835
Accumulated Depreciation (AD)	(9,215)
Total Cost Net of Accumulated Depreciation	82,620
Encumbrances	$ 0
Aimco Real Estate | 2900 on First Apartments | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Oct. 1, 2008
Location	Seattle, WA
Year Built	Jan. 1, 1989
Number of apartment homes | Units	135
Initial Cost, Land	$ 19,070
Initial Cost, Buildings and Improvements	17,518
Costs Capitalized Subsequent to Consolidation	33,024
Land	19,070
Buildings and Improvements	50,542
Total	69,612
Accumulated Depreciation (AD)	(21,502)
Total Cost Net of Accumulated Depreciation	48,110
Encumbrances	$ 14,218
Aimco Real Estate | 306 East 89th Street | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Jul. 1, 2004
Location	New York, NY
Year Built	Jan. 1, 1930
Number of apartment homes | Units	20
Initial Cost, Land	$ 2,680
Initial Cost, Buildings and Improvements	1,006
Costs Capitalized Subsequent to Consolidation	1,088
Land	2,680
Buildings and Improvements	2,094
Total	4,774
Accumulated Depreciation (AD)	(734)
Total Cost Net of Accumulated Depreciation	4,040
Encumbrances	$ 1,891
Aimco Real Estate | 311 & 313 East 73rd Street | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Mar. 1, 2003
Location	New York, NY
Year Built	Jan. 1, 1904
Number of apartment homes | Units	34
Initial Cost, Land	$ 5,678
Initial Cost, Buildings and Improvements	1,609
Costs Capitalized Subsequent to Consolidation	417
Land	5,678
Buildings and Improvements	2,026
Total	7,704
Accumulated Depreciation (AD)	(1,365)
Total Cost Net of Accumulated Depreciation	6,339
Encumbrances	$ 3,993
Aimco Real Estate | 322-324 East 61st Street | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Mar. 1, 2005
Location	New York, NY
Year Built	Jan. 1, 1900
Number of apartment homes | Units	40
Initial Cost, Land	$ 6,372
Initial Cost, Buildings and Improvements	2,224
Costs Capitalized Subsequent to Consolidation	1,476
Land	6,372
Buildings and Improvements	3,700
Total	10,072
Accumulated Depreciation (AD)	(1,618)
Total Cost Net of Accumulated Depreciation	8,454
Encumbrances	$ 3,478
Aimco Real Estate | 3400 Avenue of the Arts | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Mar. 1, 2002
Location	Costa Mesa, CA
Year Built	Jan. 1, 1987
Number of apartment homes | Units	770
Initial Cost, Land	$ 57,241
Initial Cost, Buildings and Improvements	65,506
Costs Capitalized Subsequent to Consolidation	79,189
Land	57,241
Buildings and Improvements	144,695
Total	201,936
Accumulated Depreciation (AD)	(84,070)
Total Cost Net of Accumulated Depreciation	117,866
Encumbrances	$ 148,926
Aimco Real Estate | 452 East 78th Street | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Jan. 1, 2004
Location	New York, NY
Year Built	Jan. 1, 1900
Number of apartment homes | Units	12
Initial Cost, Land	$ 1,982
Initial Cost, Buildings and Improvements	608
Costs Capitalized Subsequent to Consolidation	539
Land	1,982
Buildings and Improvements	1,147
Total	3,129
Accumulated Depreciation (AD)	(443)
Total Cost Net of Accumulated Depreciation	2,686
Encumbrances	$ 2,600
Aimco Real Estate | 464-466 Amsterdam & 200-210 W. 83rd Street | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Feb. 1, 2007
Location	New York, NY
Year Built	Jan. 1, 1910
Number of apartment homes | Units	71
Initial Cost, Land	$ 25,553
Initial Cost, Buildings and Improvements	7,101
Costs Capitalized Subsequent to Consolidation	5,641
Land	25,553
Buildings and Improvements	12,742
Total	38,295
Accumulated Depreciation (AD)	(5,569)
Total Cost Net of Accumulated Depreciation	32,726
Encumbrances	$ 20,933
Aimco Real Estate | 510 East 88th Street | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Jan. 1, 2004
Location	New York, NY
Year Built	Jan. 1, 1900
Number of apartment homes | Units	20
Initial Cost, Land	$ 3,163
Initial Cost, Buildings and Improvements	1,002
Costs Capitalized Subsequent to Consolidation	599
Land	3,163
Buildings and Improvements	1,601
Total	4,764
Accumulated Depreciation (AD)	(567)
Total Cost Net of Accumulated Depreciation	4,197
Encumbrances	$ 2,785
Aimco Real Estate | 514-516 East 88th Street | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Mar. 1, 2005
Location	New York, NY
Year Built	Jan. 1, 1900
Number of apartment homes | Units	36
Initial Cost, Land	$ 6,282
Initial Cost, Buildings and Improvements	2,168
Costs Capitalized Subsequent to Consolidation	1,319
Land	6,282
Buildings and Improvements	3,487
Total	9,769
Accumulated Depreciation (AD)	(1,460)
Total Cost Net of Accumulated Depreciation	8,309
Encumbrances	$ 3,770
Aimco Real Estate | 518 East 88th Street | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid-Rise
Date Consolidated	Jan. 1, 2014
Location	New York, NY
Year Built	Jan. 1, 1900
Number of apartment homes | Units	20
Initial Cost, Land	$ 2,233
Initial Cost, Buildings and Improvements	4,315
Costs Capitalized Subsequent to Consolidation	572
Land	2,233
Buildings and Improvements	4,887
Total	7,120
Accumulated Depreciation (AD)	(868)
Total Cost Net of Accumulated Depreciation	6,252
Encumbrances	$ 2,855
Aimco Real Estate | 707 Leahy | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Apr. 1, 2007
Location	Redwood City, CA
Year Built	Jan. 1, 1973
Number of apartment homes | Units	110
Initial Cost, Land	$ 15,444
Initial Cost, Buildings and Improvements	7,909
Costs Capitalized Subsequent to Consolidation	6,581
Land	15,444
Buildings and Improvements	14,490
Total	29,934
Accumulated Depreciation (AD)	(6,901)
Total Cost Net of Accumulated Depreciation	23,033
Encumbrances	$ 8,930
Aimco Real Estate | 865 Bellevue | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jul. 1, 2000
Location	Nashville, TN
Year Built	Jan. 1, 1972
Number of apartment homes | Units	326
Initial Cost, Land	$ 3,562
Initial Cost, Buildings and Improvements	12,037
Costs Capitalized Subsequent to Consolidation	22,966
Land	3,562
Buildings and Improvements	35,003
Total	38,565
Accumulated Depreciation (AD)	(21,942)
Total Cost Net of Accumulated Depreciation	16,623
Encumbrances	$ 16,828
Aimco Real Estate | All Hallows | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jan. 1, 2006
Location	San Francisco, CA
Year Built	Jan. 1, 1976
Number of apartment homes | Units	157
Initial Cost, Land	$ 1,338
Initial Cost, Buildings and Improvements	29,770
Costs Capitalized Subsequent to Consolidation	21,530
Land	1,338
Buildings and Improvements	51,300
Total	52,638
Accumulated Depreciation (AD)	(32,886)
Total Cost Net of Accumulated Depreciation	19,752
Encumbrances	$ 21,512
Aimco Real Estate | Axiom Apartment Homes | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Apr. 1, 2015
Location	Cambridge, MA
Year Built	Jan. 1, 2015
Number of apartment homes | Units	115
Initial Cost, Land	$ 0
Initial Cost, Buildings and Improvements	63,612
Costs Capitalized Subsequent to Consolidation	2,006
Land	0
Buildings and Improvements	65,618
Total	65,618
Accumulated Depreciation (AD)	(6,386)
Total Cost Net of Accumulated Depreciation	59,232
Encumbrances	$ 33,677
Aimco Real Estate | Bank Lofts | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Apr. 1, 2001
Location	Denver, CO
Year Built	Jan. 1, 1920
Number of apartment homes | Units	125
Initial Cost, Land	$ 3,525
Initial Cost, Buildings and Improvements	9,045
Costs Capitalized Subsequent to Consolidation	4,425
Land	3,525
Buildings and Improvements	13,470
Total	16,995
Accumulated Depreciation (AD)	(6,845)
Total Cost Net of Accumulated Depreciation	10,150
Encumbrances	$ 10,722
Aimco Real Estate | Bay Parc | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Sep. 1, 2004
Location	Miami, FL
Year Built	Jan. 1, 2000
Number of apartment homes | Units	474
Initial Cost, Land	$ 22,680
Initial Cost, Buildings and Improvements	41,847
Costs Capitalized Subsequent to Consolidation	27,069
Land	22,680
Buildings and Improvements	68,916
Total	91,596
Accumulated Depreciation (AD)	(18,431)
Total Cost Net of Accumulated Depreciation	73,165
Encumbrances	$ 43,045
Aimco Real Estate | Bay Ridge at Nashua | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jan. 1, 2003
Location	Nashua, NH
Year Built	Jan. 1, 1984
Number of apartment homes | Units	412
Initial Cost, Land	$ 3,262
Initial Cost, Buildings and Improvements	40,713
Costs Capitalized Subsequent to Consolidation	15,881
Land	3,262
Buildings and Improvements	56,594
Total	59,856
Accumulated Depreciation (AD)	(22,065)
Total Cost Net of Accumulated Depreciation	37,791
Encumbrances	$ 0
Aimco Real Estate | Bayberry Hill Estates | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Aug. 1, 2002
Location	Framingham, MA
Year Built	Jan. 1, 1971
Number of apartment homes | Units	424
Initial Cost, Land	$ 19,944
Initial Cost, Buildings and Improvements	35,945
Costs Capitalized Subsequent to Consolidation	17,864
Land	19,944
Buildings and Improvements	53,809
Total	73,753
Accumulated Depreciation (AD)	(24,945)
Total Cost Net of Accumulated Depreciation	48,808
Encumbrances	$ 30,710
Aimco Real Estate | Bayview | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jun. 1, 2005
Location	San Francisco, CA
Year Built	Jan. 1, 1976
Number of apartment homes | Units	146
Initial Cost, Land	$ 582
Initial Cost, Buildings and Improvements	15,265
Costs Capitalized Subsequent to Consolidation	18,447
Land	582
Buildings and Improvements	33,712
Total	34,294
Accumulated Depreciation (AD)	(23,433)
Total Cost Net of Accumulated Depreciation	10,861
Encumbrances	$ 11,133
Aimco Real Estate | Bluffs at Pacifica, The | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Oct. 1, 2006
Location	Pacifica, CA
Year Built	Jan. 1, 1963
Number of apartment homes | Units	64
Initial Cost, Land	$ 8,108
Initial Cost, Buildings and Improvements	4,132
Costs Capitalized Subsequent to Consolidation	19,367
Land	8,108
Buildings and Improvements	23,499
Total	31,607
Accumulated Depreciation (AD)	(11,739)
Total Cost Net of Accumulated Depreciation	19,868
Encumbrances	$ 0
Aimco Real Estate | Boston Lofts | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Apr. 1, 2001
Location	Denver, CO
Year Built	Jan. 1, 1890
Number of apartment homes | Units	158
Initial Cost, Land	$ 3,446
Initial Cost, Buildings and Improvements	20,589
Costs Capitalized Subsequent to Consolidation	5,257
Land	3,446
Buildings and Improvements	25,846
Total	29,292
Accumulated Depreciation (AD)	(13,192)
Total Cost Net of Accumulated Depreciation	16,100
Encumbrances	$ 15,663
Aimco Real Estate | Boulder Creek | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jul. 1, 1994
Location	Boulder, CO
Year Built	Jan. 1, 1973
Number of apartment homes | Units	221
Initial Cost, Land	$ 754
Initial Cost, Buildings and Improvements	7,730
Costs Capitalized Subsequent to Consolidation	20,443
Land	754
Buildings and Improvements	28,173
Total	28,927
Accumulated Depreciation (AD)	(18,728)
Total Cost Net of Accumulated Depreciation	10,199
Encumbrances	$ 4,289
Aimco Real Estate | Broadcast Center | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2002
Location	Los Angeles, CA
Year Built	Jan. 1, 1990
Number of apartment homes | Units	279
Initial Cost, Land	$ 29,407
Initial Cost, Buildings and Improvements	41,244
Costs Capitalized Subsequent to Consolidation	20,096
Land	29,407
Buildings and Improvements	61,340
Total	90,747
Accumulated Depreciation (AD)	(28,704)
Total Cost Net of Accumulated Depreciation	62,043
Encumbrances	$ 55,920
Aimco Real Estate | Broadway Lofts | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Sep. 1, 2012
Location	San Diego, CA
Year Built	Jan. 1, 1909
Number of apartment homes | Units	84
Initial Cost, Land	$ 5,367
Initial Cost, Buildings and Improvements	14,442
Costs Capitalized Subsequent to Consolidation	3,531
Land	5,367
Buildings and Improvements	17,973
Total	23,340
Accumulated Depreciation (AD)	(3,516)
Total Cost Net of Accumulated Depreciation	19,824
Encumbrances	$ 11,755
Aimco Real Estate | Burke Shire Commons | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2001
Location	Burke, VA
Year Built	Jan. 1, 1986
Number of apartment homes | Units	360
Initial Cost, Land	$ 4,867
Initial Cost, Buildings and Improvements	23,617
Costs Capitalized Subsequent to Consolidation	16,505
Land	4,867
Buildings and Improvements	40,122
Total	44,989
Accumulated Depreciation (AD)	(22,116)
Total Cost Net of Accumulated Depreciation	22,873
Encumbrances	$ 38,703
Aimco Real Estate | Calhoun Beach Club | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Dec. 1, 1998
Location	Minneapolis, MN
Year Built	Jan. 1, 1928
Number of apartment homes | Units	332
Initial Cost, Land	$ 11,708
Initial Cost, Buildings and Improvements	73,334
Costs Capitalized Subsequent to Consolidation	65,235
Land	11,708
Buildings and Improvements	138,569
Total	150,277
Accumulated Depreciation (AD)	(75,654)
Total Cost Net of Accumulated Depreciation	74,623
Encumbrances	$ 43,292
Aimco Real Estate | Canyon Terrace | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2002
Location	Saugus, CA
Year Built	Jan. 1, 1984
Number of apartment homes | Units	130
Initial Cost, Land	$ 7,508
Initial Cost, Buildings and Improvements	6,601
Costs Capitalized Subsequent to Consolidation	5,453
Land	7,508
Buildings and Improvements	12,054
Total	19,562
Accumulated Depreciation (AD)	(7,037)
Total Cost Net of Accumulated Depreciation	12,525
Encumbrances	$ 9,285
Aimco Real Estate | Cedar Rim | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Apr. 1, 2000
Location	Newcastle, WA
Year Built	Jan. 1, 1980
Number of apartment homes | Units	104
Initial Cost, Land	$ 761
Initial Cost, Buildings and Improvements	5,218
Costs Capitalized Subsequent to Consolidation	11,587
Land	761
Buildings and Improvements	16,805
Total	17,566
Accumulated Depreciation (AD)	(13,464)
Total Cost Net of Accumulated Depreciation	4,102
Encumbrances	$ 6,979
Aimco Real Estate | Charlesbank Apartment Homes | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Sep. 1, 2013
Location	Watertown, MA
Year Built	Jan. 1, 2012
Number of apartment homes | Units	44
Initial Cost, Land	$ 3,399
Initial Cost, Buildings and Improvements	11,726
Costs Capitalized Subsequent to Consolidation	702
Land	3,399
Buildings and Improvements	12,428
Total	15,827
Accumulated Depreciation (AD)	(1,897)
Total Cost Net of Accumulated Depreciation	13,930
Encumbrances	$ 7,890
Aimco Real Estate | Chestnut Hall | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Oct. 1, 2006
Location	Philadelphia, PA
Year Built	Jan. 1, 1923
Number of apartment homes | Units	315
Initial Cost, Land	$ 12,338
Initial Cost, Buildings and Improvements	14,299
Costs Capitalized Subsequent to Consolidation	9,990
Land	12,338
Buildings and Improvements	24,289
Total	36,627
Accumulated Depreciation (AD)	(11,182)
Total Cost Net of Accumulated Depreciation	25,445
Encumbrances	$ 37,443
Aimco Real Estate | Chestnut Hill Village | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Apr. 1, 2000
Location	Philadelphia, PA
Year Built	Jan. 1, 1963
Number of apartment homes | Units	821
Initial Cost, Land	$ 6,469
Initial Cost, Buildings and Improvements	49,316
Costs Capitalized Subsequent to Consolidation	42,678
Land	6,469
Buildings and Improvements	91,994
Total	98,463
Accumulated Depreciation (AD)	(56,047)
Total Cost Net of Accumulated Depreciation	42,416
Encumbrances	$ 73,566
Aimco Real Estate | Chimneys of Cradle Rock | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jun. 1, 2004
Location	Columbia, MD
Year Built	Jan. 1, 1979
Number of apartment homes | Units	198
Initial Cost, Land	$ 2,040
Initial Cost, Buildings and Improvements	8,108
Costs Capitalized Subsequent to Consolidation	1,005
Land	2,040
Buildings and Improvements	9,113
Total	11,153
Accumulated Depreciation (AD)	(3,814)
Total Cost Net of Accumulated Depreciation	7,339
Encumbrances	$ 15,021
Aimco Real Estate | Columbus Avenue | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Sep. 1, 2003
Location	New York, NY
Year Built	Jan. 1, 1880
Number of apartment homes | Units	59
Initial Cost, Land	$ 35,527
Initial Cost, Buildings and Improvements	9,450
Costs Capitalized Subsequent to Consolidation	8,604
Land	35,527
Buildings and Improvements	18,054
Total	53,581
Accumulated Depreciation (AD)	(9,266)
Total Cost Net of Accumulated Depreciation	44,315
Encumbrances	$ 25,778
Aimco Real Estate | Creekside | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jan. 1, 2000
Location	Denver, CO
Year Built	Jan. 1, 1974
Number of apartment homes | Units	328
Initial Cost, Land	$ 3,189
Initial Cost, Buildings and Improvements	12,698
Costs Capitalized Subsequent to Consolidation	6,879
Land	3,189
Buildings and Improvements	19,577
Total	22,766
Accumulated Depreciation (AD)	(12,738)
Total Cost Net of Accumulated Depreciation	10,028
Encumbrances	$ 11,570
Aimco Real Estate | Crescent at West Hollywood, The | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Mar. 1, 2002
Location	West Hollywood, CA
Year Built	Jan. 1, 1985
Number of apartment homes | Units	130
Initial Cost, Land	$ 15,765
Initial Cost, Buildings and Improvements	10,215
Costs Capitalized Subsequent to Consolidation	9,096
Land	15,765
Buildings and Improvements	19,311
Total	35,076
Accumulated Depreciation (AD)	(12,693)
Total Cost Net of Accumulated Depreciation	22,383
Encumbrances	$ 0
Aimco Real Estate | Elm Creek | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Dec. 1, 1997
Location	Elmhurst, IL
Year Built	Jan. 1, 1987
Number of apartment homes | Units	400
Initial Cost, Land	$ 8,987
Initial Cost, Buildings and Improvements	30,878
Costs Capitalized Subsequent to Consolidation	31,161
Land	8,987
Buildings and Improvements	62,039
Total	71,026
Accumulated Depreciation (AD)	(30,121)
Total Cost Net of Accumulated Depreciation	40,905
Encumbrances	$ 52,349
Aimco Real Estate | Evanston Place | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Dec. 1, 1997
Location	Evanston, IL
Year Built	Jan. 1, 1990
Number of apartment homes | Units	190
Initial Cost, Land	$ 3,232
Initial Cost, Buildings and Improvements	25,546
Costs Capitalized Subsequent to Consolidation	13,094
Land	3,232
Buildings and Improvements	38,640
Total	41,872
Accumulated Depreciation (AD)	(17,535)
Total Cost Net of Accumulated Depreciation	24,337
Encumbrances	$ 0
Aimco Real Estate | Farmingdale | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Oct. 1, 2000
Location	Darien, IL
Year Built	Jan. 1, 1975
Number of apartment homes | Units	240
Initial Cost, Land	$ 11,763
Initial Cost, Buildings and Improvements	15,174
Costs Capitalized Subsequent to Consolidation	9,514
Land	11,763
Buildings and Improvements	24,688
Total	36,451
Accumulated Depreciation (AD)	(12,231)
Total Cost Net of Accumulated Depreciation	24,220
Encumbrances	$ 13,774
Aimco Real Estate | Flamingo Towers | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Sep. 1, 1997
Location	Miami Beach, FL
Year Built	Jan. 1, 1960
Number of apartment homes | Units	1,305
Initial Cost, Land	$ 32,427
Initial Cost, Buildings and Improvements	48,808
Costs Capitalized Subsequent to Consolidation	317,464
Land	32,427
Buildings and Improvements	366,272
Total	398,699
Accumulated Depreciation (AD)	(160,620)
Total Cost Net of Accumulated Depreciation	238,079
Encumbrances	$ 105,371
Aimco Real Estate | Four Quarters Habitat | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jan. 1, 2006
Location	Miami, FL
Year Built	Jan. 1, 1976
Number of apartment homes | Units	336
Initial Cost, Land	$ 2,379
Initial Cost, Buildings and Improvements	17,199
Costs Capitalized Subsequent to Consolidation	27,711
Land	2,379
Buildings and Improvements	44,910
Total	47,289
Accumulated Depreciation (AD)	(24,508)
Total Cost Net of Accumulated Depreciation	22,781
Encumbrances	$ 4,624
Aimco Real Estate | Foxchase | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Dec. 1, 1997
Location	Alexandria, VA
Year Built	Jan. 1, 1940
Number of apartment homes | Units	2,113
Initial Cost, Land	$ 15,496
Initial Cost, Buildings and Improvements	96,062
Costs Capitalized Subsequent to Consolidation	43,269
Land	15,496
Buildings and Improvements	139,331
Total	154,827
Accumulated Depreciation (AD)	(79,714)
Total Cost Net of Accumulated Depreciation	75,113
Encumbrances	$ 228,636
Aimco Real Estate | Georgetown | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Aug. 1, 2002
Location	Framingham, MA
Year Built	Jan. 1, 1964
Number of apartment homes | Units	207
Initial Cost, Land	$ 12,351
Initial Cost, Buildings and Improvements	13,168
Costs Capitalized Subsequent to Consolidation	3,280
Land	12,351
Buildings and Improvements	16,448
Total	28,799
Accumulated Depreciation (AD)	(7,575)
Total Cost Net of Accumulated Depreciation	21,224
Encumbrances	$ 0
Aimco Real Estate | Georgetown II | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Aug. 1, 2002
Location	Framingham, MA
Year Built	Jan. 1, 1958
Number of apartment homes | Units	72
Initial Cost, Land	$ 4,577
Initial Cost, Buildings and Improvements	4,057
Costs Capitalized Subsequent to Consolidation	1,642
Land	4,577
Buildings and Improvements	5,699
Total	10,276
Accumulated Depreciation (AD)	(3,128)
Total Cost Net of Accumulated Depreciation	7,148
Encumbrances	$ 0
Aimco Real Estate | Heritage Park Escondido | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Oct. 1, 2000
Location	Escondido, CA
Year Built	Jan. 1, 1986
Number of apartment homes | Units	196
Initial Cost, Land	$ 1,055
Initial Cost, Buildings and Improvements	7,565
Costs Capitalized Subsequent to Consolidation	2,284
Land	1,055
Buildings and Improvements	9,849
Total	10,904
Accumulated Depreciation (AD)	(6,589)
Total Cost Net of Accumulated Depreciation	4,315
Encumbrances	$ 6,377
Aimco Real Estate | Heritage Park Livermore | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Oct. 1, 2000
Location	Livermore, CA
Year Built	Jan. 1, 1988
Number of apartment homes | Units	167
Initial Cost, Land	$ 0
Initial Cost, Buildings and Improvements	10,209
Costs Capitalized Subsequent to Consolidation	1,889
Land	0
Buildings and Improvements	12,098
Total	12,098
Accumulated Depreciation (AD)	(7,854)
Total Cost Net of Accumulated Depreciation	4,244
Encumbrances	$ 6,603
Aimco Real Estate | Heritage Village Anaheim | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Oct. 1, 2000
Location	Anaheim, CA
Year Built	Jan. 1, 1986
Number of apartment homes | Units	196
Initial Cost, Land	$ 1,832
Initial Cost, Buildings and Improvements	8,541
Costs Capitalized Subsequent to Consolidation	1,985
Land	1,832
Buildings and Improvements	10,526
Total	12,358
Accumulated Depreciation (AD)	(6,665)
Total Cost Net of Accumulated Depreciation	5,693
Encumbrances	$ 7,741
Aimco Real Estate | Hidden Cove | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jul. 1, 1998
Location	Escondido, CA
Year Built	Jan. 1, 1983
Number of apartment homes | Units	334
Initial Cost, Land	$ 3,043
Initial Cost, Buildings and Improvements	17,616
Costs Capitalized Subsequent to Consolidation	10,386
Land	3,043
Buildings and Improvements	28,002
Total	31,045
Accumulated Depreciation (AD)	(15,425)
Total Cost Net of Accumulated Depreciation	15,620
Encumbrances	$ 33,765
Aimco Real Estate | Hidden Cove II | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jul. 1, 2007
Location	Escondido, CA
Year Built	Jan. 1, 1986
Number of apartment homes | Units	118
Initial Cost, Land	$ 12,849
Initial Cost, Buildings and Improvements	6,530
Costs Capitalized Subsequent to Consolidation	5,093
Land	12,849
Buildings and Improvements	11,623
Total	24,472
Accumulated Depreciation (AD)	(5,362)
Total Cost Net of Accumulated Depreciation	19,110
Encumbrances	$ 13,684
Aimco Real Estate | Hillcreste | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2002
Location	Century City, CA
Year Built	Jan. 1, 1989
Number of apartment homes | Units	315
Initial Cost, Land	$ 35,862
Initial Cost, Buildings and Improvements	47,216
Costs Capitalized Subsequent to Consolidation	12,220
Land	35,862
Buildings and Improvements	59,436
Total	95,298
Accumulated Depreciation (AD)	(26,131)
Total Cost Net of Accumulated Depreciation	69,167
Encumbrances	$ 64,958
Aimco Real Estate | Hillmeade | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Nov. 1, 1994
Location	Nashville, TN
Year Built	Jan. 1, 1986
Number of apartment homes | Units	288
Initial Cost, Land	$ 2,872
Initial Cost, Buildings and Improvements	16,070
Costs Capitalized Subsequent to Consolidation	19,270
Land	2,872
Buildings and Improvements	35,340
Total	38,212
Accumulated Depreciation (AD)	(19,327)
Total Cost Net of Accumulated Depreciation	18,885
Encumbrances	$ 27,866
Aimco Real Estate | Horizons West Apartments | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Dec. 1, 2006
Location	Pacifica, CA
Year Built	Jan. 1, 1970
Number of apartment homes | Units	78
Initial Cost, Land	$ 8,887
Initial Cost, Buildings and Improvements	6,377
Costs Capitalized Subsequent to Consolidation	2,298
Land	8,887
Buildings and Improvements	8,675
Total	17,562
Accumulated Depreciation (AD)	(4,167)
Total Cost Net of Accumulated Depreciation	13,395
Encumbrances	$ 14,046
Aimco Real Estate | Hunt Club | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Sep. 1, 2000
Location	Gaithersburg, MD
Year Built	Jan. 1, 1986
Number of apartment homes | Units	336
Initial Cost, Land	$ 17,859
Initial Cost, Buildings and Improvements	13,149
Costs Capitalized Subsequent to Consolidation	13,136
Land	17,859
Buildings and Improvements	26,285
Total	44,144
Accumulated Depreciation (AD)	(14,636)
Total Cost Net of Accumulated Depreciation	29,508
Encumbrances	$ 0
Aimco Real Estate | Hyde Park Tower | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Oct. 1, 2004
Location	Chicago, IL
Year Built	Jan. 1, 1990
Number of apartment homes | Units	155
Initial Cost, Land	$ 4,731
Initial Cost, Buildings and Improvements	14,927
Costs Capitalized Subsequent to Consolidation	11,493
Land	4,731
Buildings and Improvements	26,420
Total	31,151
Accumulated Depreciation (AD)	(7,939)
Total Cost Net of Accumulated Depreciation	23,212
Encumbrances	$ 12,926
Aimco Real Estate | Indian Oaks | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2002
Location	Simi Valley, CA
Year Built	Jan. 1, 1986
Number of apartment homes | Units	254
Initial Cost, Land	$ 24,523
Initial Cost, Buildings and Improvements	15,801
Costs Capitalized Subsequent to Consolidation	8,551
Land	24,523
Buildings and Improvements	24,352
Total	48,875
Accumulated Depreciation (AD)	(11,896)
Total Cost Net of Accumulated Depreciation	36,979
Encumbrances	$ 28,163
Aimco Real Estate | Indigo | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Aug. 1, 2016
Location	Redwood City, CA
Year Built	Jan. 1, 2016
Number of apartment homes | Units	463
Initial Cost, Land	$ 26,932
Initial Cost, Buildings and Improvements	296,116
Costs Capitalized Subsequent to Consolidation	878
Land	26,932
Buildings and Improvements	296,994
Total	323,926
Accumulated Depreciation (AD)	(14,249)
Total Cost Net of Accumulated Depreciation	309,677
Encumbrances	$ 141,411
Aimco Real Estate | Island Club | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Oct. 1, 2000
Location	Oceanside, CA
Year Built	Jan. 1, 1986
Number of apartment homes | Units	592
Initial Cost, Land	$ 18,027
Initial Cost, Buildings and Improvements	28,654
Costs Capitalized Subsequent to Consolidation	15,611
Land	18,027
Buildings and Improvements	44,265
Total	62,292
Accumulated Depreciation (AD)	(28,228)
Total Cost Net of Accumulated Depreciation	34,064
Encumbrances	$ 56,392
Aimco Real Estate | Key Towers | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Apr. 1, 2001
Location	Alexandria, VA
Year Built	Jan. 1, 1964
Number of apartment homes | Units	140
Initial Cost, Land	$ 1,526
Initial Cost, Buildings and Improvements	7,050
Costs Capitalized Subsequent to Consolidation	7,355
Land	1,526
Buildings and Improvements	14,405
Total	15,931
Accumulated Depreciation (AD)	(11,077)
Total Cost Net of Accumulated Depreciation	4,854
Encumbrances	$ 0
Aimco Real Estate | Lakeside | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Oct. 1, 1999
Location	Lisle, IL
Year Built	Jan. 1, 1972
Number of apartment homes | Units	568
Initial Cost, Land	$ 5,840
Initial Cost, Buildings and Improvements	27,937
Costs Capitalized Subsequent to Consolidation	22,369
Land	5,840
Buildings and Improvements	50,306
Total	56,146
Accumulated Depreciation (AD)	(32,466)
Total Cost Net of Accumulated Depreciation	23,680
Encumbrances	$ 25,709
Aimco Real Estate | La Salle | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Oct. 1, 2000
Location	San Francisco, CA
Year Built	Jan. 1, 1976
Number of apartment homes | Units	145
Initial Cost, Land	$ 1,866
Initial Cost, Buildings and Improvements	19,567
Costs Capitalized Subsequent to Consolidation	19,145
Land	1,866
Buildings and Improvements	38,712
Total	40,578
Accumulated Depreciation (AD)	(28,312)
Total Cost Net of Accumulated Depreciation	12,266
Encumbrances	$ 17,052
Aimco Real Estate | Latrobe | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Jan. 1, 2003
Location	Washington, DC
Year Built	Jan. 1, 1980
Number of apartment homes | Units	175
Initial Cost, Land	$ 3,459
Initial Cost, Buildings and Improvements	9,103
Costs Capitalized Subsequent to Consolidation	13,498
Land	3,459
Buildings and Improvements	22,601
Total	26,060
Accumulated Depreciation (AD)	(12,042)
Total Cost Net of Accumulated Depreciation	14,018
Encumbrances	$ 27,356
Aimco Real Estate | Laurel Crossing | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jan. 1, 2006
Location	San Mateo, CA
Year Built	Jan. 1, 1971
Number of apartment homes | Units	418
Initial Cost, Land	$ 49,474
Initial Cost, Buildings and Improvements	17,756
Costs Capitalized Subsequent to Consolidation	14,730
Land	49,474
Buildings and Improvements	32,486
Total	81,960
Accumulated Depreciation (AD)	(16,074)
Total Cost Net of Accumulated Depreciation	65,886
Encumbrances	$ 72,788
Aimco Real Estate | Lincoln Place | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Oct. 1, 2004
Location	Venice, CA
Year Built	Jan. 1, 1951
Number of apartment homes | Units	795
Initial Cost, Land	$ 128,332
Initial Cost, Buildings and Improvements	10,439
Costs Capitalized Subsequent to Consolidation	334,559
Land	44,197
Buildings and Improvements	344,998
Total	389,195
Accumulated Depreciation (AD)	(95,770)
Total Cost Net of Accumulated Depreciation	293,425
Encumbrances	$ 191,039
Aimco Real Estate | Lodge at Chattahoochee, The | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Oct. 1, 1999
Location	Sandy Springs, GA
Year Built	Jan. 1, 1970
Number of apartment homes | Units	312
Initial Cost, Land	$ 2,335
Initial Cost, Buildings and Improvements	16,370
Costs Capitalized Subsequent to Consolidation	16,477
Land	2,335
Buildings and Improvements	32,847
Total	35,182
Accumulated Depreciation (AD)	(21,310)
Total Cost Net of Accumulated Depreciation	13,872
Encumbrances	$ 19,775
Aimco Real Estate | Malibu Canyon | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2002
Location	Calabasas, CA
Year Built	Jan. 1, 1986
Number of apartment homes | Units	698
Initial Cost, Land	$ 69,834
Initial Cost, Buildings and Improvements	53,438
Costs Capitalized Subsequent to Consolidation	32,597
Land	69,834
Buildings and Improvements	86,035
Total	155,869
Accumulated Depreciation (AD)	(41,216)
Total Cost Net of Accumulated Depreciation	114,653
Encumbrances	$ 107,643
Aimco Real Estate | Maple Bay | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Dec. 1, 1999
Location	Virginia Beach, VA
Year Built	Jan. 1, 1971
Number of apartment homes | Units	414
Initial Cost, Land	$ 2,597
Initial Cost, Buildings and Improvements	16,141
Costs Capitalized Subsequent to Consolidation	18,032
Land	2,597
Buildings and Improvements	34,173
Total	36,770
Accumulated Depreciation (AD)	(22,497)
Total Cost Net of Accumulated Depreciation	14,273
Encumbrances	$ 0
Aimco Real Estate | Mariner's Cove | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2002
Location	San Diego, CA
Year Built	Jan. 1, 1984
Number of apartment homes | Units	500
Initial Cost, Land	$ 0
Initial Cost, Buildings and Improvements	66,861
Costs Capitalized Subsequent to Consolidation	9,980
Land	0
Buildings and Improvements	76,841
Total	76,841
Accumulated Depreciation (AD)	(36,154)
Total Cost Net of Accumulated Depreciation	40,687
Encumbrances	$ 0
Aimco Real Estate | Meadow Creek | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jul. 1, 1994
Location	Boulder, CO
Year Built	Jan. 1, 1968
Number of apartment homes | Units	332
Initial Cost, Land	$ 1,435
Initial Cost, Buildings and Improvements	24,533
Costs Capitalized Subsequent to Consolidation	8,739
Land	1,435
Buildings and Improvements	33,272
Total	34,707
Accumulated Depreciation (AD)	(17,699)
Total Cost Net of Accumulated Depreciation	17,008
Encumbrances	$ 41,229
Aimco Real Estate | Merrill House | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Jan. 1, 2000
Location	Falls Church, VA
Year Built	Jan. 1, 1964
Number of apartment homes | Units	159
Initial Cost, Land	$ 1,836
Initial Cost, Buildings and Improvements	10,831
Costs Capitalized Subsequent to Consolidation	8,031
Land	1,836
Buildings and Improvements	18,862
Total	20,698
Accumulated Depreciation (AD)	(10,460)
Total Cost Net of Accumulated Depreciation	10,238
Encumbrances	$ 0
Aimco Real Estate | Mezzo | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Mar. 1, 2015
Location	Atlanta, GA
Year Built	Jan. 1, 2008
Number of apartment homes | Units	94
Initial Cost, Land	$ 4,292
Initial Cost, Buildings and Improvements	34,178
Costs Capitalized Subsequent to Consolidation	1,039
Land	4,292
Buildings and Improvements	35,217
Total	39,509
Accumulated Depreciation (AD)	(4,115)
Total Cost Net of Accumulated Depreciation	35,394
Encumbrances	$ 24,002
Aimco Real Estate | Monterey Grove | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jun. 1, 2008
Location	San Jose, CA
Year Built	Jan. 1, 1999
Number of apartment homes | Units	224
Initial Cost, Land	$ 34,325
Initial Cost, Buildings and Improvements	21,939
Costs Capitalized Subsequent to Consolidation	7,585
Land	34,325
Buildings and Improvements	29,524
Total	63,849
Accumulated Depreciation (AD)	(11,678)
Total Cost Net of Accumulated Depreciation	52,171
Encumbrances	$ 0
Aimco Real Estate | Ocean House on Prospect | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Apr. 1, 2013
Location	La Jolla, CA
Year Built	Jan. 1, 1970
Number of apartment homes | Units	53
Initial Cost, Land	$ 12,528
Initial Cost, Buildings and Improvements	18,805
Costs Capitalized Subsequent to Consolidation	14,936
Land	12,528
Buildings and Improvements	33,741
Total	46,269
Accumulated Depreciation (AD)	(4,584)
Total Cost Net of Accumulated Depreciation	41,685
Encumbrances	$ 13,191
Aimco Real Estate | One Canal | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Sep. 1, 2013
Location	Boston, MA
Year Built	Jan. 1, 2016
Number of apartment homes | Units	310
Initial Cost, Land	$ 0
Initial Cost, Buildings and Improvements	15,873
Costs Capitalized Subsequent to Consolidation	178,996
Land	0
Buildings and Improvements	194,869
Total	194,869
Accumulated Depreciation (AD)	(12,378)
Total Cost Net of Accumulated Depreciation	182,491
Encumbrances	$ 112,037
Aimco Real Estate | Pacific Bay Vistas | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2001
Location	San Bruno, CA
Year Built	Jan. 1, 1987
Number of apartment homes | Units	308
Initial Cost, Land	$ 28,694
Initial Cost, Buildings and Improvements	62,460
Costs Capitalized Subsequent to Consolidation	37,025
Land	23,354
Buildings and Improvements	99,485
Total	122,839
Accumulated Depreciation (AD)	(28,511)
Total Cost Net of Accumulated Depreciation	94,328
Encumbrances	$ 68,704
Aimco Real Estate | Pacifica Park | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jul. 1, 2006
Location	Pacifica, CA
Year Built	Jan. 1, 1977
Number of apartment homes | Units	104
Initial Cost, Land	$ 12,970
Initial Cost, Buildings and Improvements	6,579
Costs Capitalized Subsequent to Consolidation	7,766
Land	12,970
Buildings and Improvements	14,345
Total	27,315
Accumulated Depreciation (AD)	(5,667)
Total Cost Net of Accumulated Depreciation	21,648
Encumbrances	$ 11,195
Aimco Real Estate | Palazzo at Park La Brea, The | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Feb. 1, 2004
Location	Los Angeles, CA
Year Built	Jan. 1, 2002
Number of apartment homes | Units	521
Initial Cost, Land	$ 48,362
Initial Cost, Buildings and Improvements	125,464
Costs Capitalized Subsequent to Consolidation	40,851
Land	48,362
Buildings and Improvements	166,315
Total	214,677
Accumulated Depreciation (AD)	(72,351)
Total Cost Net of Accumulated Depreciation	142,326
Encumbrances	$ 170,000
Aimco Real Estate | Palazzo East at Park La Brea, The | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Mar. 1, 2005
Location	Los Angeles, CA
Year Built	Jan. 1, 2005
Number of apartment homes | Units	611
Initial Cost, Land	$ 72,578
Initial Cost, Buildings and Improvements	136,503
Costs Capitalized Subsequent to Consolidation	16,160
Land	72,578
Buildings and Improvements	152,663
Total	225,241
Accumulated Depreciation (AD)	(66,415)
Total Cost Net of Accumulated Depreciation	158,826
Encumbrances	$ 111,494
Aimco Real Estate | Parc Mosaic | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Dec. 1, 2014
Location	Boulder, CO
Year Built	Jan. 1, 1970
Number of apartment homes | Units	140
Initial Cost, Land	$ 15,300
Initial Cost, Buildings and Improvements	0
Costs Capitalized Subsequent to Consolidation	11,748
Land	15,300
Buildings and Improvements	11,748
Total	27,048
Accumulated Depreciation (AD)	0
Total Cost Net of Accumulated Depreciation	27,048
Encumbrances	$ 0
Aimco Real Estate | Park Towne Place | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Apr. 1, 2000
Location	Philadelphia, PA
Year Built	Jan. 1, 1959
Number of apartment homes | Units	942
Initial Cost, Land	$ 10,472
Initial Cost, Buildings and Improvements	47,301
Costs Capitalized Subsequent to Consolidation	303,898
Land	10,472
Buildings and Improvements	351,199
Total	361,671
Accumulated Depreciation (AD)	(91,256)
Total Cost Net of Accumulated Depreciation	270,415
Encumbrances	$ 0
Aimco Real Estate | Pathfinder Village | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jan. 1, 2006
Location	Fremont, CA
Year Built	Jan. 1, 1973
Number of apartment homes | Units	246
Initial Cost, Land	$ 19,595
Initial Cost, Buildings and Improvements	14,838
Costs Capitalized Subsequent to Consolidation	14,497
Land	19,595
Buildings and Improvements	29,335
Total	48,930
Accumulated Depreciation (AD)	(12,384)
Total Cost Net of Accumulated Depreciation	36,546
Encumbrances	$ 38,136
Aimco Real Estate | Peachtree Park | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jan. 1, 1996
Location	Atlanta, GA
Year Built	Jan. 1, 1969
Number of apartment homes | Units	303
Initial Cost, Land	$ 4,684
Initial Cost, Buildings and Improvements	11,713
Costs Capitalized Subsequent to Consolidation	13,347
Land	4,684
Buildings and Improvements	25,060
Total	29,744
Accumulated Depreciation (AD)	(15,621)
Total Cost Net of Accumulated Depreciation	14,123
Encumbrances	$ 1,337
Aimco Real Estate | Plantation Gardens | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Oct. 1, 1999
Location	Plantation, FL
Year Built	Jan. 1, 1971
Number of apartment homes | Units	372
Initial Cost, Land	$ 3,773
Initial Cost, Buildings and Improvements	19,443
Costs Capitalized Subsequent to Consolidation	24,563
Land	3,773
Buildings and Improvements	44,006
Total	47,779
Accumulated Depreciation (AD)	(25,406)
Total Cost Net of Accumulated Depreciation	22,373
Encumbrances	$ 0
Aimco Real Estate | Post Ridge | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jul. 1, 2000
Location	Nashville, TN
Year Built	Jan. 1, 1972
Number of apartment homes | Units	150
Initial Cost, Land	$ 1,883
Initial Cost, Buildings and Improvements	6,712
Costs Capitalized Subsequent to Consolidation	5,120
Land	1,883
Buildings and Improvements	11,832
Total	13,715
Accumulated Depreciation (AD)	(7,856)
Total Cost Net of Accumulated Depreciation	5,859
Encumbrances	$ 5,218
Aimco Real Estate | Preserve at Marin | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Aug. 1, 2011
Location	Corte Madera, CA
Year Built	Jan. 1, 1964
Number of apartment homes | Units	126
Initial Cost, Land	$ 18,179
Initial Cost, Buildings and Improvements	30,132
Costs Capitalized Subsequent to Consolidation	83,631
Land	18,179
Buildings and Improvements	113,763
Total	131,942
Accumulated Depreciation (AD)	(19,787)
Total Cost Net of Accumulated Depreciation	112,155
Encumbrances	$ 37,034
Aimco Real Estate | Ravensworth Towers | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Jun. 1, 2004
Location	Annandale, VA
Year Built	Jan. 1, 1974
Number of apartment homes | Units	219
Initial Cost, Land	$ 3,455
Initial Cost, Buildings and Improvements	17,157
Costs Capitalized Subsequent to Consolidation	3,639
Land	3,455
Buildings and Improvements	20,796
Total	24,251
Accumulated Depreciation (AD)	(13,849)
Total Cost Net of Accumulated Depreciation	10,402
Encumbrances	$ 20,789
Aimco Real Estate | River Club,The | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Apr. 1, 2005
Location	Edgewater, NJ
Year Built	Jan. 1, 1998
Number of apartment homes | Units	266
Initial Cost, Land	$ 30,579
Initial Cost, Buildings and Improvements	30,638
Costs Capitalized Subsequent to Consolidation	6,689
Land	30,579
Buildings and Improvements	37,327
Total	67,906
Accumulated Depreciation (AD)	(15,673)
Total Cost Net of Accumulated Depreciation	52,233
Encumbrances	$ 0
Aimco Real Estate | Riverloft | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Oct. 1, 1999
Location	Philadelphia, PA
Year Built	Jan. 1, 1910
Number of apartment homes | Units	184
Initial Cost, Land	$ 2,120
Initial Cost, Buildings and Improvements	11,286
Costs Capitalized Subsequent to Consolidation	30,432
Land	2,120
Buildings and Improvements	41,718
Total	43,838
Accumulated Depreciation (AD)	(21,471)
Total Cost Net of Accumulated Depreciation	22,367
Encumbrances	$ 9,378
Aimco Real Estate | Rosewood | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2002
Location	Camarillo, CA
Year Built	Jan. 1, 1976
Number of apartment homes | Units	152
Initial Cost, Land	$ 12,430
Initial Cost, Buildings and Improvements	8,060
Costs Capitalized Subsequent to Consolidation	4,081
Land	12,430
Buildings and Improvements	12,141
Total	24,571
Accumulated Depreciation (AD)	(6,385)
Total Cost Net of Accumulated Depreciation	18,186
Encumbrances	$ 16,095
Aimco Real Estate | Royal Crest Estates | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Aug. 1, 2002
Location	Warwick, RI
Year Built	Jan. 1, 1972
Number of apartment homes | Units	492
Initial Cost, Land	$ 22,433
Initial Cost, Buildings and Improvements	24,095
Costs Capitalized Subsequent to Consolidation	4,309
Land	22,433
Buildings and Improvements	28,404
Total	50,837
Accumulated Depreciation (AD)	(18,569)
Total Cost Net of Accumulated Depreciation	32,268
Encumbrances	$ 0
Aimco Real Estate | Royal Crest Estates | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Aug. 1, 2002
Location	Nashua, NH
Year Built	Jan. 1, 1970
Number of apartment homes | Units	902
Initial Cost, Land	$ 68,230
Initial Cost, Buildings and Improvements	45,562
Costs Capitalized Subsequent to Consolidation	13,521
Land	68,230
Buildings and Improvements	59,083
Total	127,313
Accumulated Depreciation (AD)	(38,506)
Total Cost Net of Accumulated Depreciation	88,807
Encumbrances	$ 0
Aimco Real Estate | Royal Crest Estates | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Aug. 1, 2002
Location	Marlborough, MA
Year Built	Jan. 1, 1970
Number of apartment homes | Units	473
Initial Cost, Land	$ 25,178
Initial Cost, Buildings and Improvements	28,786
Costs Capitalized Subsequent to Consolidation	11,388
Land	25,178
Buildings and Improvements	40,174
Total	65,352
Accumulated Depreciation (AD)	(24,315)
Total Cost Net of Accumulated Depreciation	41,037
Encumbrances	$ 30,841
Aimco Real Estate | Royal Crest Estates | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Aug. 1, 2002
Location	North Andover, MA
Year Built	Jan. 1, 1970
Number of apartment homes | Units	588
Initial Cost, Land	$ 51,292
Initial Cost, Buildings and Improvements	36,808
Costs Capitalized Subsequent to Consolidation	24,271
Land	51,292
Buildings and Improvements	61,079
Total	112,371
Accumulated Depreciation (AD)	(32,966)
Total Cost Net of Accumulated Depreciation	79,405
Encumbrances	$ 42,110
Aimco Real Estate | Savannah Trace | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2001
Location	Shaumburg, IL
Year Built	Jan. 1, 1986
Number of apartment homes | Units	368
Initial Cost, Land	$ 13,960
Initial Cost, Buildings and Improvements	20,731
Costs Capitalized Subsequent to Consolidation	11,147
Land	13,960
Buildings and Improvements	31,878
Total	45,838
Accumulated Depreciation (AD)	(15,939)
Total Cost Net of Accumulated Depreciation	29,899
Encumbrances	$ 23,202
Aimco Real Estate | Saybrook Pointe | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Dec. 1, 2014
Location	San Jose, CA
Year Built	Jan. 1, 1995
Number of apartment homes | Units	324
Initial Cost, Land	$ 32,842
Initial Cost, Buildings and Improvements	84,457
Costs Capitalized Subsequent to Consolidation	19,633
Land	32,842
Buildings and Improvements	104,090
Total	136,932
Accumulated Depreciation (AD)	(9,681)
Total Cost Net of Accumulated Depreciation	127,251
Encumbrances	$ 63,540
Aimco Real Estate | Shoreview | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Oct. 1, 1999
Location	San Francisco, CA
Year Built	Jan. 1, 1976
Number of apartment homes | Units	156
Initial Cost, Land	$ 1,476
Initial Cost, Buildings and Improvements	19,071
Costs Capitalized Subsequent to Consolidation	20,752
Land	1,476
Buildings and Improvements	39,823
Total	41,299
Accumulated Depreciation (AD)	(30,085)
Total Cost Net of Accumulated Depreciation	11,214
Encumbrances	$ 18,461
Aimco Real Estate | Shenandoah Crossing | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Sep. 1, 2000
Location	Fairfax, VA
Year Built	Jan. 1, 1984
Number of apartment homes | Units	640
Initial Cost, Land	$ 18,200
Initial Cost, Buildings and Improvements	57,198
Costs Capitalized Subsequent to Consolidation	24,350
Land	18,200
Buildings and Improvements	81,548
Total	99,748
Accumulated Depreciation (AD)	(53,306)
Total Cost Net of Accumulated Depreciation	46,442
Encumbrances	$ 59,748
Aimco Real Estate | Springwoods at Lake Ridge | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jul. 1, 2002
Location	Woodbridge, VA
Year Built	Jan. 1, 1984
Number of apartment homes | Units	180
Initial Cost, Land	$ 5,587
Initial Cost, Buildings and Improvements	7,284
Costs Capitalized Subsequent to Consolidation	3,069
Land	5,587
Buildings and Improvements	10,353
Total	15,940
Accumulated Depreciation (AD)	(4,160)
Total Cost Net of Accumulated Depreciation	11,780
Encumbrances	$ 0
Aimco Real Estate | St. George Villas | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jan. 1, 2006
Location	St. George, SC
Year Built	Jan. 1, 1984
Number of apartment homes | Units	40
Initial Cost, Land	$ 107
Initial Cost, Buildings and Improvements	1,025
Costs Capitalized Subsequent to Consolidation	400
Land	107
Buildings and Improvements	1,425
Total	1,532
Accumulated Depreciation (AD)	(1,218)
Total Cost Net of Accumulated Depreciation	314
Encumbrances	$ 336
Aimco Real Estate | Sterling Apartment Homes, The | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Oct. 1, 1999
Location	Philadelphia, PA
Year Built	Jan. 1, 1961
Number of apartment homes | Units	534
Initial Cost, Land	$ 8,871
Initial Cost, Buildings and Improvements	55,365
Costs Capitalized Subsequent to Consolidation	117,562
Land	8,871
Buildings and Improvements	172,927
Total	181,798
Accumulated Depreciation (AD)	(70,455)
Total Cost Net of Accumulated Depreciation	111,343
Encumbrances	$ 146,650
Aimco Real Estate | Stone Creek Club | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Sep. 1, 2000
Location	Germantown, MD
Year Built	Jan. 1, 1984
Number of apartment homes | Units	240
Initial Cost, Land	$ 13,593
Initial Cost, Buildings and Improvements	9,347
Costs Capitalized Subsequent to Consolidation	7,230
Land	13,593
Buildings and Improvements	16,577
Total	30,170
Accumulated Depreciation (AD)	(11,902)
Total Cost Net of Accumulated Depreciation	18,268
Encumbrances	$ 0
Aimco Real Estate | Timbers at Long Reach Apartment Homes | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Apr. 1, 2005
Location	Columbia, MD
Year Built	Jan. 1, 1979
Number of apartment homes | Units	178
Initial Cost, Land	$ 2,430
Initial Cost, Buildings and Improvements	12,181
Costs Capitalized Subsequent to Consolidation	1,283
Land	2,430
Buildings and Improvements	13,464
Total	15,894
Accumulated Depreciation (AD)	(7,340)
Total Cost Net of Accumulated Depreciation	8,554
Encumbrances	$ 12,405
Aimco Real Estate | Towers Of Westchester Park, The | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Jan. 1, 2006
Location	College Park, MD
Year Built	Jan. 1, 1972
Number of apartment homes | Units	303
Initial Cost, Land	$ 15,198
Initial Cost, Buildings and Improvements	22,029
Costs Capitalized Subsequent to Consolidation	12,858
Land	15,198
Buildings and Improvements	34,887
Total	50,085
Accumulated Depreciation (AD)	(16,965)
Total Cost Net of Accumulated Depreciation	33,120
Encumbrances	$ 23,836
Aimco Real Estate | Township At Highlands | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Town Home
Date Consolidated	Nov. 1, 1996
Location	Centennial, CO
Year Built	Jan. 1, 1985
Number of apartment homes | Units	161
Initial Cost, Land	$ 1,536
Initial Cost, Buildings and Improvements	9,773
Costs Capitalized Subsequent to Consolidation	8,471
Land	1,536
Buildings and Improvements	18,244
Total	19,780
Accumulated Depreciation (AD)	(11,272)
Total Cost Net of Accumulated Depreciation	8,508
Encumbrances	$ 13,965
Aimco Real Estate | Tremont | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Dec. 1, 2014
Location	Atlanta, GA
Year Built	Jan. 1, 2009
Number of apartment homes | Units	78
Initial Cost, Land	$ 5,274
Initial Cost, Buildings and Improvements	18,011
Costs Capitalized Subsequent to Consolidation	2,335
Land	5,274
Buildings and Improvements	20,346
Total	25,620
Accumulated Depreciation (AD)	(2,258)
Total Cost Net of Accumulated Depreciation	23,362
Encumbrances	$ 0
Aimco Real Estate | Twin Lake Towers | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Oct. 1, 1999
Location	Westmont, IL
Year Built	Jan. 1, 1969
Number of apartment homes | Units	399
Initial Cost, Land	$ 3,268
Initial Cost, Buildings and Improvements	18,763
Costs Capitalized Subsequent to Consolidation	36,186
Land	3,268
Buildings and Improvements	54,949
Total	58,217
Accumulated Depreciation (AD)	(40,894)
Total Cost Net of Accumulated Depreciation	17,323
Encumbrances	$ 29,851
Aimco Real Estate | Vantage Pointe | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Aug. 1, 2002
Location	Swampscott, MA
Year Built	Jan. 1, 1987
Number of apartment homes | Units	96
Initial Cost, Land	$ 4,748
Initial Cost, Buildings and Improvements	10,089
Costs Capitalized Subsequent to Consolidation	1,663
Land	4,748
Buildings and Improvements	11,752
Total	16,500
Accumulated Depreciation (AD)	(4,853)
Total Cost Net of Accumulated Depreciation	11,647
Encumbrances	$ 3,385
Aimco Real Estate | Villa Del Sol | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2002
Location	Norwalk, CA
Year Built	Jan. 1, 1972
Number of apartment homes | Units	120
Initial Cost, Land	$ 7,476
Initial Cost, Buildings and Improvements	4,861
Costs Capitalized Subsequent to Consolidation	4,040
Land	7,476
Buildings and Improvements	8,901
Total	16,377
Accumulated Depreciation (AD)	(4,628)
Total Cost Net of Accumulated Depreciation	11,749
Encumbrances	$ 10,813
Aimco Real Estate | Villas at Park La Brea, The | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2002
Location	Los Angeles, CA
Year Built	Jan. 1, 2002
Number of apartment homes | Units	250
Initial Cost, Land	$ 8,630
Initial Cost, Buildings and Improvements	48,871
Costs Capitalized Subsequent to Consolidation	7,116
Land	8,630
Buildings and Improvements	55,987
Total	64,617
Accumulated Depreciation (AD)	(27,703)
Total Cost Net of Accumulated Depreciation	36,914
Encumbrances	$ 14,477
Aimco Real Estate | Villas of Pasadena | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Mid Rise
Date Consolidated	Jan. 1, 2006
Location	Pasadena, CA
Year Built	Jan. 1, 1973
Number of apartment homes | Units	92
Initial Cost, Land	$ 9,693
Initial Cost, Buildings and Improvements	6,818
Costs Capitalized Subsequent to Consolidation	3,963
Land	9,693
Buildings and Improvements	10,781
Total	20,474
Accumulated Depreciation (AD)	(3,740)
Total Cost Net of Accumulated Depreciation	16,734
Encumbrances	$ 9,299
Aimco Real Estate | Vivo | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Jun. 1, 2015
Location	Cambridge, MA
Year Built	Jan. 1, 2015
Number of apartment homes | Units	91
Initial Cost, Land	$ 6,450
Initial Cost, Buildings and Improvements	35,974
Costs Capitalized Subsequent to Consolidation	5,089
Land	6,450
Buildings and Improvements	41,063
Total	47,513
Accumulated Depreciation (AD)	(5,853)
Total Cost Net of Accumulated Depreciation	41,660
Encumbrances	$ 20,796
Aimco Real Estate | Waterford Village | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Aug. 1, 2002
Location	Bridgewater, MA
Year Built	Jan. 1, 1971
Number of apartment homes | Units	588
Initial Cost, Land	$ 29,110
Initial Cost, Buildings and Improvements	28,101
Costs Capitalized Subsequent to Consolidation	5,644
Land	29,110
Buildings and Improvements	33,745
Total	62,855
Accumulated Depreciation (AD)	(24,149)
Total Cost Net of Accumulated Depreciation	38,706
Encumbrances	$ 36,024
Aimco Real Estate | Waterways Village | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Jun. 1, 1997
Location	Aventura, FL
Year Built	Jan. 1, 1994
Number of apartment homes | Units	180
Initial Cost, Land	$ 4,504
Initial Cost, Buildings and Improvements	11,064
Costs Capitalized Subsequent to Consolidation	13,340
Land	4,504
Buildings and Improvements	24,404
Total	28,908
Accumulated Depreciation (AD)	(10,804)
Total Cost Net of Accumulated Depreciation	18,104
Encumbrances	$ 13,456
Aimco Real Estate | Waverly Apartments | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Aug. 1, 2008
Location	Brighton, MA
Year Built	Jan. 1, 1970
Number of apartment homes | Units	103
Initial Cost, Land	$ 7,920
Initial Cost, Buildings and Improvements	11,347
Costs Capitalized Subsequent to Consolidation	5,912
Land	7,920
Buildings and Improvements	17,259
Total	25,179
Accumulated Depreciation (AD)	(5,740)
Total Cost Net of Accumulated Depreciation	19,439
Encumbrances	$ 11,770
Aimco Real Estate | Wexford Village | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Aug. 1, 2002
Location	Worcester, MA
Year Built	Jan. 1, 1974
Number of apartment homes | Units	264
Initial Cost, Land	$ 6,349
Initial Cost, Buildings and Improvements	17,939
Costs Capitalized Subsequent to Consolidation	2,595
Land	6,349
Buildings and Improvements	20,534
Total	26,883
Accumulated Depreciation (AD)	(11,885)
Total Cost Net of Accumulated Depreciation	14,998
Encumbrances	$ 0
Aimco Real Estate | Willow Bend | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	May 1, 1998
Location	Rolling Meadows, IL
Year Built	Jan. 1, 1969
Number of apartment homes | Units	328
Initial Cost, Land	$ 2,717
Initial Cost, Buildings and Improvements	15,437
Costs Capitalized Subsequent to Consolidation	22,524
Land	2,717
Buildings and Improvements	37,961
Total	40,678
Accumulated Depreciation (AD)	(26,029)
Total Cost Net of Accumulated Depreciation	14,649
Encumbrances	$ 33,838
Aimco Real Estate | Windrift | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2001
Location	Oceanside, CA
Year Built	Jan. 1, 1987
Number of apartment homes | Units	404
Initial Cost, Land	$ 24,960
Initial Cost, Buildings and Improvements	17,590
Costs Capitalized Subsequent to Consolidation	19,948
Land	24,960
Buildings and Improvements	37,538
Total	62,498
Accumulated Depreciation (AD)	(21,906)
Total Cost Net of Accumulated Depreciation	40,592
Encumbrances	$ 39,408
Aimco Real Estate | Windsor Park | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	Garden
Date Consolidated	Mar. 1, 2001
Location	Woodbridge, VA
Year Built	Jan. 1, 1987
Number of apartment homes | Units	220
Initial Cost, Land	$ 4,279
Initial Cost, Buildings and Improvements	15,970
Costs Capitalized Subsequent to Consolidation	5,686
Land	4,279
Buildings and Improvements	21,656
Total	25,935
Accumulated Depreciation (AD)	(12,356)
Total Cost Net of Accumulated Depreciation	13,579
Encumbrances	$ 17,338
Aimco Real Estate | Yacht Club at Brickell | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Dec. 1, 2003
Location	Miami, FL
Year Built	Jan. 1, 1998
Number of apartment homes | Units	357
Initial Cost, Land	$ 31,362
Initial Cost, Buildings and Improvements	32,214
Costs Capitalized Subsequent to Consolidation	13,762
Land	31,362
Buildings and Improvements	45,976
Total	77,338
Accumulated Depreciation (AD)	(15,954)
Total Cost Net of Accumulated Depreciation	61,384
Encumbrances	$ 45,303
Aimco Real Estate | Yorktown Apartments | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Property Type	High Rise
Date Consolidated	Dec. 1, 1999
Location	Lombard, IL
Year Built	Jan. 1, 1971
Number of apartment homes | Units	364
Initial Cost, Land	$ 3,055
Initial Cost, Buildings and Improvements	18,162
Costs Capitalized Subsequent to Consolidation	50,494
Land	3,055
Buildings and Improvements	68,656
Total	71,711
Accumulated Depreciation (AD)	(23,943)
Total Cost Net of Accumulated Depreciation	47,768
Encumbrances	$ 29,010
Aimco Real Estate | Other | Continuing Operations
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Number of apartment homes | Units	0
Initial Cost, Land	$ 75,903
Initial Cost, Buildings and Improvements	10,474
Costs Capitalized Subsequent to Consolidation	7,948
Land	40,022
Buildings and Improvements	18,422
Total	58,444
Accumulated Depreciation (AD)	(6,675)
Total Cost Net of Accumulated Depreciation	51,769
Encumbrances	$ 0

Real Estate and Accumulated D81

Real Estate and Accumulated Depreciation - Summary Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Asset Management
Real Estate
Balance at beginning of year	$ 555,049	$ 562,589	$ 567,927
Additions during the year:
Capital additions	8,255	8,909	7,379
Deductions during the year:
Casualty and other write-offs	(1,711)	(2,116)	(12,717)
Amounts related to assets held for sale	0	(2,801)	0
Sales	(10,469)	(11,532)	0
Balance at end of year	551,124	555,049	562,589
Accumulated Depreciation
Balance at beginning of year	309,401	289,574	278,887
Additions during the year
Depreciation	24,090	24,704	23,279
Deductions during the year:
Casualty and other write-offs	(2,480)	(68)	(12,592)
Amounts related to assets held for sale	0	(1,525)	0
Sales	(4,760)	(3,284)	0
Balance at end of year	326,251	309,401	289,574
Write-off of fully depreciated assets	1,800		11,800
Aimco Real Estate
Real Estate
Balance at beginning of year	7,931,117	7,744,894	7,577,031
Additions during the year:
Acquisitions	16,687	333,174	147,077
Capital additions	345,974	329,697	355,569
Deductions during the year:
Casualty and other write-offs	(106,590)	(170,744)	(66,844)
Provision for real estate impairment loss	(35,881)	0	0
Amounts related to assets held for sale	(38,208)	0	(7,036)
Sales	(185,346)	(305,904)	(260,903)
Balance at end of year	7,927,753	7,931,117	7,744,894
Accumulated Depreciation
Balance at beginning of year	2,421,357	2,488,448	2,393,292
Additions during the year
Depreciation	320,870	287,661	262,235
Deductions during the year:
Casualty and other write-offs	(106,521)	(169,098)	(66,246)
Amounts related to assets held for sale	(20,383)	0	(4,427)
Sales	(92,965)	(185,654)	(96,406)
Balance at end of year	2,522,358	2,421,357	2,488,448
Write-off of fully depreciated assets	$ 106,400	$ 167,900	$ 65,100

Uncategorized Items - aiv-20171

Label	Element	Value
AIMCO Properties, LP [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 65,710,000
AIMCO Properties, LP [Member] | Limited Partner [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	3,028,000
AIMCO Properties, LP [Member] | General Partner and Special Limited Partner [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	62,682,000
AIMCO Properties, LP [Member] | Partners Capital Attributable To The Partnership [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	65,710,000
Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	62,682,000
Noncontrolling Interest [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	3,028,000
Accumulated Distributions in Excess of Net Income [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 62,682,000