Apartment Investment and Management (AIV) 10-K 29 Feb 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2015	Feb. 25, 2016	Jun. 30, 2015
Entity Registrant Name	APARTMENT INVESTMENT & MANAGEMENT CO
Entity Central Index Key	922,864
Document Type	10-K
Document Period End Date	Dec. 31, 2015
Amendment Flag	false
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 5.7
Entity Common Stock, Shares Outstanding		156,599,775
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, 2015
Amendment Flag	false
Document Fiscal Year Focus	2,015
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		164,453,698

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Buildings and improvements	$ 6,446,326	$ 6,259,318
Land	1,861,157	1,885,640
Total real estate	8,307,483	8,144,958
Accumulated depreciation	(2,778,022)	(2,672,179)
Net real estate ($335,129 and $360,160 related to VIEs)	5,529,461	5,472,779
Cash and cash equivalents ($18,852 and $17,108 related to VIEs)	50,789	28,971
Restricted cash ($33,835 and $36,196 related to VIEs)	86,956	91,445
Other assets ($168,519 and $182,108 related to VIEs)	473,918	476,727
Assets held for sale	3,070	27,106
Total assets	6,144,194	6,097,028
LIABILITIES AND EQUITY
Non-recourse property debt ($325,203 and $336,471 related to VIEs)	3,846,160	4,022,809
Revolving credit facility borrowings	27,000	112,330
Total indebtedness	3,873,160	4,135,139
Accounts payable	36,123	41,919
Accrued liabilities and other ($173,689 and $135,644 related to VIEs)	318,975	279,077
Deferred income	64,052	81,882
Liabilities related to assets held for sale	53	28,969
Total liabilities	4,292,363	4,566,986
Preferred noncontrolling interests/Redeemable Preferred Units	$ 87,926	$ 87,937
Commitments and contingencies (Note 7)
Equity:
Perpetual Preferred Stock (Note 9)	$ 159,126	$ 186,126
Common Stock, $0.01 par value, 500,787,260 shares authorized, 156,326,416 and 146,403,274 shares issued/outstanding at December 31, 2015 and 2014, respectively	1,563	1,464
Additional paid-in capital	4,064,659	3,696,143
Accumulated other comprehensive loss	(6,040)	(6,456)
Distributions in excess of earnings	(2,596,917)	(2,649,542)
Total Aimco equity	1,622,391	1,227,735
Noncontrolling interests in consolidated real estate partnerships	151,365	233,296
Common noncontrolling interests in Aimco Operating Partnership	(9,851)	(18,926)
Total equity	1,763,905	1,442,105
Total liabilities and equity	6,144,194	6,097,028
AIMCO PROPERTIES, L.P.
ASSETS
Buildings and improvements	6,446,326	6,259,318
Land	1,861,157	1,885,640
Total real estate	8,307,483	8,144,958
Accumulated depreciation	(2,778,022)	(2,672,179)
Net real estate ($335,129 and $360,160 related to VIEs)	5,529,461	5,472,779
Cash and cash equivalents ($18,852 and $17,108 related to VIEs)	50,789	28,971
Restricted cash ($33,835 and $36,196 related to VIEs)	86,956	91,445
Other assets ($168,519 and $182,108 related to VIEs)	473,918	476,727
Assets held for sale	3,070	27,106
Total assets	6,144,194	6,097,028
LIABILITIES AND EQUITY
Non-recourse property debt ($325,203 and $336,471 related to VIEs)	3,846,160	4,022,809
Revolving credit facility borrowings	27,000	112,330
Total indebtedness	3,873,160	4,135,139
Accounts payable	36,123	41,919
Accrued liabilities and other ($173,689 and $135,644 related to VIEs)	318,975	279,077
Deferred income	64,052	81,882
Liabilities related to assets held for sale	53	28,969
Total liabilities	4,292,363	4,566,986
Preferred noncontrolling interests/Redeemable Preferred Units	$ 87,926	$ 87,937
Commitments and contingencies (Note 7)
Equity:
Preferred units (Note 10)	$ 159,126	$ 186,126
General Partner and Special Limited Partner	1,463,265	1,041,609
Limited Partners	(9,851)	(18,926)
Partners’ capital attributable to the Aimco Operating Partnership	1,612,540	1,208,809
Noncontrolling interests in consolidated real estate partnerships	151,365	233,296
Total partners’ capital	1,763,905	1,442,105
Total liabilities and equity	$ 6,144,194	$ 6,097,028

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Net real estate	$ 5,529,461	$ 5,472,779
Cash and cash equivalents	50,789	28,971
Restricted cash	86,956	91,445
Other assets	473,918	476,727
Non-recourse property debt	3,846,160	4,022,809
Accrued liabilities and other ($173,689 and $135,644 related to VIEs)	$ 318,975	$ 279,077
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized	500,787,260	500,787,260
Common Stock, shares issued	156,326,416	146,403,274
Shares of common stock outstanding	156,326,416	146,403,274
AIMCO PROPERTIES, L.P.
Net real estate	$ 5,529,461	$ 5,472,779
Cash and cash equivalents	50,789	28,971
Restricted cash	86,956	91,445
Other assets	473,918	476,727
Non-recourse property debt	3,846,160	4,022,809
Accrued liabilities and other ($173,689 and $135,644 related to VIEs)	318,975	279,077
Variable Interest Entity, Primary Beneficiary [Member]
Net real estate	335,129	360,160
Cash and cash equivalents	18,852	17,108
Restricted cash	33,835	36,196
Other assets	168,519	182,108
Non-recourse property debt	325,203	336,471
Accrued liabilities and other ($173,689 and $135,644 related to VIEs)	173,689	135,644
Variable Interest Entity, Primary Beneficiary [Member] | AIMCO PROPERTIES, L.P.
Net real estate	335,129	360,160
Cash and cash equivalents	18,852	17,108
Restricted cash	33,835	36,196
Other assets	168,519	182,108
Non-recourse property debt	325,203	336,471
Accrued liabilities and other ($173,689 and $135,644 related to VIEs)	$ 173,689	$ 135,644

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
REVENUES:
Rental and other property revenues	$ 956,954	$ 952,831	$ 939,231
Tax credit and asset management revenues	24,356	31,532	34,822
Total revenues	981,310	984,363	974,053
OPERATING EXPENSES:
Property operating expenses	359,393	373,654	375,710
Investment management expenses	5,855	7,310	4,341
Depreciation and amortization	306,301	282,608	291,910
Provision for real estate impairment losses	0	1,820	0
General and administrative expenses	43,178	44,092	45,670
Other expenses, net	10,368	12,529	7,403
Total operating expenses	725,095	722,013	725,034
Operating income	256,215	262,350	249,019
Interest income	6,949	6,878	17,943
Interest expense	(199,685)	(220,971)	(237,048)
Other, net	387	(829)	2,723
Income before income taxes and discontinued operations	63,866	47,428	32,637
Income tax benefit	27,524	20,047	1,959
Income from continuing operations	91,390	67,475	34,596
Income from discontinued operations, net of tax (Note 12)	0	0	203,229
Gain on dispositions of real estate, net of tax (Note 12)	180,593	288,636	0
Net income	271,983	356,111	237,825
Noncontrolling interests:
Net income attributable to noncontrolling interests in consolidated real estate partnerships	(4,776)	(24,595)	(12,473)
Net income attributable to preferred noncontrolling interests in Aimco Operating Partnership	(6,943)	(6,497)	(6,423)
Net income attributable to common noncontrolling interests in Aimco Operating Partnership	(11,554)	(15,770)	(11,639)
Net income attributable to noncontrolling interests	(23,273)	(46,862)	(30,535)
Net income attributable to the company	248,710	309,249	207,290
Net income attributable to the company's preferred equityholders	(11,794)	(7,947)	(2,804)
Net income attributable to participating securities	(950)	(1,082)	(813)
Net income attributable to the company's common equityholders	$ 235,966	$ 300,220	$ 203,673
Earnings attributable to the company's common equityholders - basic and diluted:
Income from continuing operations	$ 1.52	$ 2.06	$ 0.29
Income from discontinued operations	0	0	1.11
Net income	$ 1.52	$ 2.06	$ 1.40
Weighted average common shares/units outstanding - basic	155,177	145,639	145,291
Weighted average common shares/units outstanding - diluted	155,570	146,002	145,532
AIMCO PROPERTIES, L.P.
REVENUES:
Rental and other property revenues	$ 956,954	$ 952,831	$ 939,231
Tax credit and asset management revenues	24,356	31,532	34,822
Total revenues	981,310	984,363	974,053
OPERATING EXPENSES:
Property operating expenses	359,393	373,654	375,710
Investment management expenses	5,855	7,310	4,341
Depreciation and amortization	306,301	282,608	291,910
Provision for real estate impairment losses	0	1,820	0
General and administrative expenses	43,178	44,092	45,670
Other expenses, net	10,368	12,529	7,403
Total operating expenses	725,095	722,013	725,034
Operating income	256,215	262,350	249,019
Interest income	6,949	6,878	17,943
Interest expense	(199,685)	(220,971)	(237,048)
Other, net	387	(829)	2,723
Income before income taxes and discontinued operations	63,866	47,428	32,637
Income tax benefit	27,524	20,047	1,959
Income from continuing operations	91,390	67,475	34,596
Income from discontinued operations, net of tax (Note 12)	0	0	203,229
Gain on dispositions of real estate, net of tax (Note 12)	180,593	288,636	0
Net income	271,983	356,111	237,825
Noncontrolling interests:
Net income attributable to noncontrolling interests in consolidated real estate partnerships	(4,776)	(24,595)	(12,473)
Net income attributable to the company	267,207	331,516	225,352
Net income attributable to the company's preferred equityholders	(18,737)	(14,444)	(9,227)
Net income attributable to participating securities	(950)	(1,082)	(813)
Net income attributable to the company's common equityholders	$ 247,520	$ 315,990	$ 215,312
Earnings attributable to the company's common equityholders - basic and diluted:
Income from continuing operations	$ 1.52	$ 2.06	$ 0.29
Income from discontinued operations	0	0	1.11
Net income	$ 1.52	$ 2.06	$ 1.40
Weighted average common shares/units outstanding - basic	162,834	153,363	153,256
Weighted average common shares/units outstanding - diluted	163,227	153,726	153,497

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income	$ 271,983	$ 356,111	$ 237,825
Other comprehensive income (loss):
Unrealized (losses) gains on interest rate swaps	(1,299)	(2,306)	1,734
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss	1,678	1,685	1,678
Unrealized gains (losses) on debt securities classified as available-for-sale	214	(1,192)	(4,188)
Other comprehensive income (loss)	593	(1,813)	(776)
Comprehensive income	272,576	354,298	237,049
Comprehensive income attributable to noncontrolling interests	(23,450)	(46,903)	(30,819)
Comprehensive income (loss) attributable to Aimco/Operating Partnership	249,126	307,395	206,230
AIMCO PROPERTIES, L.P.
Net income	271,983	356,111	237,825
Other comprehensive income (loss):
Unrealized (losses) gains on interest rate swaps	(1,299)	(2,306)	1,734
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss	1,678	1,685	1,678
Unrealized gains (losses) on debt securities classified as available-for-sale	214	(1,192)	(4,188)
Other comprehensive income (loss)	593	(1,813)	(776)
Comprehensive income	272,576	354,298	237,049
Comprehensive income attributable to noncontrolling interests	(4,932)	(24,733)	(12,815)
Comprehensive income (loss) attributable to Aimco/Operating Partnership	$ 267,644	$ 329,565	$ 224,234

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Distributions in Excess of Earnings	Total Aimco Equity	Noncontrolling Interests
Beginning Balances, Shares at Dec. 31, 2012		1,274	145,564
Beginning Balances at Dec. 31, 2012	$ 1,154,894	$ 68,114	$ 1,456	$ 3,712,684	$ (3,542)	$ (2,863,287)	$ 915,425	$ 239,469
Redemption of Aimco Operating Partnership units	(3,085)							(3,085)
Amortization of share-based compensation cost, Shares			33
Amortization of share-based compensation cost	5,915			5,915			5,915
Exercises of stock options, Shares			44
Exercises of stock options	993		$ 0	993			993
Contributions from noncontrolling interests	1,630							1,630
Effect of changes in ownership for consolidated entities	(17,675)			(19,805)			(19,805)	2,130
Change in accumulated other comprehensive loss	(776)				(1,060)		(1,060)	284
Other, net, shares			276
Other, net	2,248		$ 3	1,552		0	1,555	693
Net income	231,402					207,290	207,290	24,112
Distributions to noncontrolling interests	(59,946)							(59,946)
Common Stock dividends	(140,052)					(140,052)	(140,052)
Preferred Stock dividends	(2,804)					(2,804)	(2,804)
Ending Balances, Shares at Dec. 31, 2013		1,274	145,917
Ending Balances at Dec. 31, 2013	1,172,744	$ 68,114	$ 1,459	3,701,339	(4,602)	(2,798,853)	967,457	205,287
Issuance of Preferred Stock, Shares		5,117
Issuance of Preferred Stock	123,552	$ 128,012		(4,460)			123,552
Redemption of Preferred Stock	(9,516)	$ (10,000)		257		227	(9,516)
Redemption of Aimco Operating Partnership units	(7,756)							(7,756)
Amortization of share-based compensation cost, Shares			33
Amortization of share-based compensation cost	6,139			6,139			6,139
Exercises of stock options, Shares			303
Exercises of stock options	768		$ 3	765			768
Contributions from noncontrolling interests	11,559							11,559
Effect of changes in ownership for consolidated entities	712			(8,097)			(8,097)	8,809
Change in accumulated other comprehensive loss	(1,813)				(1,854)		(1,854)	41
Other, net, shares			150
Other, net	181		$ 2	200			202	(21)
Net income	349,614					309,249	309,249	40,365
Distributions to noncontrolling interests	(43,914)							(43,914)
Common Stock dividends	(151,991)					(151,991)	(151,991)
Preferred Stock dividends	(8,174)					(8,174)	(8,174)
Ending Balances, Shares at Dec. 31, 2014		6,391	146,403
Ending Balances at Dec. 31, 2014	1,442,105	$ 186,126	$ 1,464	3,696,143	(6,456)	(2,649,542)	1,227,735	214,370
Issuance of Preferred Stock, Shares			9,430
Issuance of Preferred Stock	366,580		$ 94	366,486			366,580
Redemption of Preferred Stock	(27,000)	$ (27,000)		695		(695)	(27,000)
Redemption of Aimco Operating Partnership units	(4,181)							(4,181)
Amortization of share-based compensation cost, Shares			27
Amortization of share-based compensation cost	7,096			7,096			7,096
Exercises of stock options, Shares			144
Exercises of stock options	267		$ 2	265			267
Effect of changes in ownership for consolidated entities	(1,819)			(6,008)			(6,008)	4,189
Change in accumulated other comprehensive loss	593				416		416	177
Other, net, shares			322
Other, net	85		$ 3	(18)		100	85	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, Shares at Dec. 31, 2015		6,391	156,326
Ending Balances at Dec. 31, 2015	$ 1,763,905	$ 159,126	$ 1,563	$ 4,064,659	$ (6,040)	$ (2,596,917)	$ 1,622,391	$ 141,514

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 271,983	$ 356,111	$ 237,825
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	306,301	282,608	291,910
Provision for real estate impairment losses	0	1,820	0
Other, net	(387)	829	(2,723)
Gain on dispositions of real estate, net of tax	(180,593)	(288,636)	0
Income tax benefit	(27,524)	(20,047)	(1,959)
Share-based compensation expense	6,640	5,781	5,645
Amortization of deferred loan costs and other	5,186	3,814	4,915
Adjustments to net income from discontinued operations	0	0	(186,068)
Changes in operating assets and operating liabilities:
Accounts receivable and other assets	619	9,039	4,592
Accounts payable, accrued liabilities and other	(22,334)	(29,895)	(28,541)
Total adjustments	87,908	(34,687)	87,771
Net cash provided by operating activities	359,891	321,424	325,596
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of real estate and deposits related to purchases of real estate	(169,447)	(284,041)	(51,291)
Capital expenditures	(367,180)	(367,324)	(350,338)
Proceeds from dispositions of real estate	367,571	640,044	357,314
Purchases of corporate assets	(6,665)	(8,479)	(10,863)
Purchase of property loans	0	0	119,101
Proceeds from repayment of property loans and option value	0	0	215,517
Changes in restricted cash	(429)	26,315	3,003
Other investing activities	5,253	7,163	20,951
Net cash (used in) provided by investing activities	(170,897)	13,678	65,192
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from non-recourse property debt	352,602	188,503	232,965
Principal repayments on non-recourse property debt	(514,294)	(513,599)	(472,276)
Net (repayments) borrowings on revolving credit facility	(85,330)	61,930	50,400
Proceeds from issuance of common stock or units	366,580	0	0
Proceeds from issuance of preferred stock or units	0	123,551	0
Redemptions and repurchases of preferred stock or units	(27,000)	(9,516)	0
Proceeds from Common Stock option exercises	0	768	993
Payment of dividends to holders of preferred stock or units	(11,099)	(7,073)	(2,804)
Payment of dividends to holders of Common Stock	(184,082)	(152,002)	(140,052)
Payment of distributions to noncontrolling interests	(57,401)	(49,972)	(63,766)
Purchases of noncontrolling interests in consolidated real estate partnerships	0	0	(16,775)
Other financing activities	(7,152)	(4,472)	(8,135)
Net cash used in financing activities	(167,176)	(361,882)	(419,450)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	21,818	(26,780)	(28,662)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	28,971	55,751	84,413
CASH AND CASH EQUIVALENTS AT END OF PERIOD	50,789	28,971	55,751
SUPPLEMENTAL CASH FLOW INFORMATION [Abstract]
Interest paid	207,087	231,887	273,635
Cash paid for income taxes	2,033	1,657	629
Non-cash transactions associated with the acquisition or disposition of real estate:
Non-recourse property debt assumed in connection with our acquisition of real estate	0	65,200	14,767
Non-recourse property debt assumed by buyer in connection with our disposition of real estate	6,068	58,410	126,663
Non-recourse, subordinate debt of the disposed legacy asset management business forgiven in connection with the disposition of real estate	0	0	8,149
Issuance of preferred OP Units in connection with acquisition of real estate	0	9,117	0
Other non-cash transactions:
Issuance of common OP Units for acquisition of noncontrolling interests in consolidated real estate partnerships	0	0	416
Accrued capital expenditures	43,725	45,701	45,571
Accrued dividends on TSR restricted stock (Note 11)	309	0	0
AIMCO PROPERTIES, L.P.
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	271,983	356,111	237,825
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	306,301	282,608	291,910
Provision for real estate impairment losses	0	1,820	0
Other, net	(387)	829	(2,723)
Gain on dispositions of real estate, net of tax	(180,593)	(288,636)	0
Income tax benefit	(27,524)	(20,047)	(1,959)
Share-based compensation expense	6,640	5,781	5,645
Amortization of deferred loan costs and other	5,186	3,814	4,915
Adjustments to net income from discontinued operations	0	0	(186,068)
Changes in operating assets and operating liabilities:
Accounts receivable and other assets	619	9,039	4,592
Accounts payable, accrued liabilities and other	(22,334)	(29,895)	(28,541)
Total adjustments	87,908	(34,687)	87,771
Net cash provided by operating activities	359,891	321,424	325,596
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of real estate and deposits related to purchases of real estate	(169,447)	(284,041)	(51,291)
Capital expenditures	(367,180)	(367,324)	(350,338)
Proceeds from dispositions of real estate	367,571	640,044	357,314
Purchases of corporate assets	(6,665)	(8,479)	(10,863)
Purchase of property loans	0	0	119,101
Proceeds from repayment of property loans and option value	0	0	215,517
Changes in restricted cash	(429)	26,315	3,003
Other investing activities	5,253	7,163	20,951
Net cash (used in) provided by investing activities	(170,897)	13,678	65,192
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from non-recourse property debt	352,602	188,503	232,965
Principal repayments on non-recourse property debt	(514,294)	(513,599)	(472,276)
Net (repayments) borrowings on revolving credit facility	(85,330)	61,930	50,400
Proceeds from issuance of common stock or units	366,580	0	0
Proceeds from issuance of preferred stock or units	0	123,551
Redemptions and repurchases of preferred stock or units	(27,000)	(9,516)	0
Proceeds from Common Stock option exercises	0	768	993
Payment of dividends to holders of preferred stock or units	(18,042)	(13,482)	(9,227)
Payment of distributions to General Partner and Special Limited Partner	(184,082)	(152,002)	(140,052)
Payment of distributions to Limited Partners	(6,701)	(8,008)	(7,642)
Payment of distributions to noncontrolling interests	(43,757)	(35,555)	(49,701)
Purchases of noncontrolling interests in consolidated real estate partnerships	0	0	(16,775)
Other financing activities	(7,152)	(4,472)	(8,135)
Net cash used in financing activities	(167,176)	(361,882)	(419,450)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	21,818	(26,780)	(28,662)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	28,971	55,751	84,413
CASH AND CASH EQUIVALENTS AT END OF PERIOD	50,789	28,971	55,751
SUPPLEMENTAL CASH FLOW INFORMATION [Abstract]
Interest paid	207,087	231,887	273,635
Cash paid for income taxes	2,033	1,657	629
Non-cash transactions associated with the acquisition or disposition of real estate:
Non-recourse property debt assumed in connection with our acquisition of real estate	0	65,200	14,767
Non-recourse property debt assumed by buyer in connection with our disposition of real estate	6,068	58,410	126,663
Non-recourse, subordinate debt of the disposed legacy asset management business forgiven in connection with the disposition of real estate	0	0	8,149
Other non-cash transactions:
Issuance of common OP Units for acquisition of noncontrolling interests in consolidated real estate partnerships	0	0	416
Accrued capital expenditures	43,725	45,701	45,571
Accrued dividends on TSR restricted stock (Note 11)	$ 309	$ 0	$ 0

Consolidated Statements of Part

Consolidated Statements of Partners' Capital - USD ($) $ in Thousands	Total	AIMCO PROPERTIES, L.P.	Preferred UnitsAIMCO PROPERTIES, L.P.	General Partner and Special Limited PartnerAIMCO PROPERTIES, L.P.	Limited PartnersAIMCO PROPERTIES, L.P.	Partners’ Capital Attributable to the PartnershipAIMCO PROPERTIES, L.P.	Non - controlling InterestsAIMCO PROPERTIES, L.P.
Partners' Capital at Dec. 31, 2012		$ 1,154,894	$ 68,114	$ 847,311	$ (31,596)	$ 883,829	$ 271,065
Redemption of partnership units held by non-Aimco partners		(3,085)			(3,085)	(3,085)
Amortization of Aimco stock-based compensation		5,915		5,915		5,915
Issuance of common partnership units to Aimco in connection with exercise of Aimco stock options	$ 993	993		993		993
Contributions from noncontrolling interests	1,630	1,630					1,630
Effect of changes in ownership for consolidated entities		(17,675)		(19,805)	2,635	(17,170)	(505)
Change in accumulated other comprehensive loss	(776)	(776)		(1,060)	(58)	(1,118)	342
Other, net		2,248		1,555	386	1,941	307
Net income		231,402		207,290	11,639	218,929	12,473
Distributions to noncontrolling interests	(59,946)	(52,304)					(52,304)
Distributions to common unitholders		(147,694)		(140,052)	(7,642)	(147,694)
Distributions to preferred unitholders		(2,804)		(2,804)		(2,804)
Partners' Capital at Dec. 31, 2013		1,172,744	68,114	899,343	(27,721)	939,736	233,008
Issuance of preferred units to Aimco		123,552	128,012	(4,460)		123,552
Redemption of preferred units held by Aimco		(9,516)	(10,000)	(484)		(9,516)
Redemption of partnership units held by non-Aimco partners		(7,756)			(7,756)	(7,756)
Amortization of Aimco stock-based compensation		6,139		6,139		6,139
Issuance of common partnership units to Aimco in connection with exercise of Aimco stock options	768	768		768		768
Contributions from noncontrolling interests	11,559	11,559					11,559
Effect of changes in ownership for consolidated entities		712		(8,097)	8,888	791	(79)
Change in accumulated other comprehensive loss	(1,813)	(1,813)		(1,854)	(97)	(1,951)	138
Other, net		181		202	0	202	(21)
Net income		349,614		309,249	15,770	325,019	24,595
Distributions to noncontrolling interests	(43,914)	(35,904)					(35,904)
Distributions to common unitholders		(160,001)		(151,991)	(8,010)	(160,001)
Distributions to preferred unitholders		(8,174)		(8,174)		(8,174)
Partners' Capital at Dec. 31, 2014		1,442,105	186,126	1,041,609	(18,926)	1,208,809	233,296
Issuance of preferred units to Aimco			0
Redemption of preferred units held by Aimco		(27,000)	(27,000)	0		(27,000)
Issuance of common partnership units to Aimco		366,580		366,580		366,580
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
Issuance of common partnership units to Aimco in connection with exercise of Aimco stock options	267	267		267		267
Effect of changes in ownership for consolidated entities		(1,819)		(6,008)	10,739	4,731	(6,550)
Change in accumulated other comprehensive loss	593	593		416	21	437	$ 156
Other, net		85		85	0	85
Net income		265,040		248,710	11,554	260,264	$ 4,776
Distributions to noncontrolling interests	$ (89,371)	(80,313)					(80,313)
Distributions to common unitholders		(193,449)		(184,391)	(9,058)	(193,449)
Distributions to preferred unitholders		(11,099)		(11,099)		(11,099)
Partners' Capital at Dec. 31, 2015		$ 1,763,905	$ 159,126	$ 1,463,265	$ (9,851)	$ 1,612,540	$ 151,365

Organization

Organization	12 Months Ended
	Dec. 31, 2015
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 the largest coastal and job growth 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, high performance partnership units and partnership preferred units, which we refer to as common OP Units, HPUs and preferred OP Units, respectively. We also refer to HPUs as common partnership unit equivalents. At December 31, 2015 , after eliminations for units held by consolidated subsidiaries, the Aimco Operating Partnership had 164,179,533 common partnership units and equivalents outstanding. At December 31, 2015 , Aimco owned 156,326,416 of the common partnership units ( 95.2% of the common partnership units and equivalents 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, 2015 , we owned an equity interest in 140 conventional apartment communities with 40,464 apartment homes and 56 affordable apartment communities with 8,685 apartment homes. Of these apartment communities, we consolidated 136 conventional apartment communities with 40,322 apartment homes and 49 affordable apartment communities with 7,998 apartment homes. These conventional and affordable apartment communities generated 90% and 10% , respectively, of the proportionate property net operating income (as defined in Note 15 and excluding amounts related to apartment communities sold or classified as held for sale) during the year ended December 31, 2015 .

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
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 entities. We consolidate all variable interest entities for which we are the primary beneficiary. 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. 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. As of December 31, 2015 , we were the primary beneficiary of, and therefore consolidated, 61 VIEs, which owned 47 apartment communities with 7,459 apartment homes. Substantially all of these VIEs are partnerships that operate qualifying affordable housing apartment communities and which are structured to provide for the pass-through of low-income housing tax credits and deductions to their partners. Real estate with a net book value of $335.1 million collateralized $325.2 million of debt of those VIEs. Any significant amounts of assets and liabilities related to our consolidated VIEs are identified parenthetically on our accompanying consolidated balance sheets. The creditors of the consolidated VIEs do not have recourse to our general credit. In addition to the VIEs discussed above, at December 31, 2015 , our consolidated financial statements included certain consolidated and unconsolidated VIEs that are part of the legacy asset management business we sold during 2012, which is discussed in Note 3 . The assets and liabilities related to these consolidated and unconsolidated VIEs are each condensed into single line items within other assets and accrued liabilities and other, respectively, in our consolidated balance sheets. Generally, we consolidate real estate partnerships and other entities that are not variable interest entities when we own, directly or indirectly, a majority voting interest in the entity or are otherwise able to control the entity. All significant intercompany balances and transactions 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 consolidated real estate partnerships owned or controlled by the Aimco Operating Partnership generally are not available to pay creditors of Aimco or 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 Assets and Related Depreciation and Amortization We recognize the acquisition of apartment communities or interests in partnerships that own apartment communities at fair value. If the transaction results in consolidation and the apartment community is considered a business, we expense related transaction costs as incurred. If the apartment community is considered an asset (e.g. apartment communities under construction or vacant at time of acquisition), the related transaction costs are capitalized and allocated to the acquired assets. We allocate the cost of acquired apartment communities to tangible assets and identified intangible assets and liabilities based on their fair values. We determine the fair value of tangible assets, such as land, building, furniture, fixtures and equipment, generally using internal 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 internal 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 estimated 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 vacant apartment homes during the absorption period (estimates of lost rental revenue during the expected lease-up periods based on market demand and stabilized occupancy levels at the time of acquisition). Depreciation for all tangible real estate 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, 2015 , the weighted average depreciable life of our acquired buildings and improvements was approximately 30 years. Furniture, fixtures and equipment associated with acquired apartment communities are depreciated over five years. The values of the above- and below-market leases 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, 2015 and 2014 , deferred income in our consolidated balance sheets includes below-market lease amounts totaling $12.1 million and $13.8 million , respectively, which are net of accumulated amortization of $31.4 million and $29.7 million , respectively. During the years ended December 31, 2015 , 2014 and 2013 , we included amortization of below-market leases of $1.7 million , $1.3 million and $2.9 million , respectively, in rental and other property revenues in our consolidated statements of operations. In connection with apartment communities sold during the year ended December 31, 2014 , we wrote off $1.8 million of unamortized below-market lease amounts to gain on dispositions of real estate. There were no such write offs during the years ended December 31, 2015 and 2013. At December 31, 2015 , our below-market leases had a weighted average amortization period of 6.7 years and estimated aggregate amortization for each of the five succeeding years as follows (in thousands): 2016 2017 2018 2019 2020 Estimated amortization $ 1,337 $ 1,239 $ 1,095 $ 1,007 $ 915 Capital Additions and Related Depreciation We capitalize costs, including certain indirect costs, incurred in connection with our capital additions activities, including redevelopment, development and construction projects, 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 redevelopment, development and construction projects are in progress. We commence capitalization of costs, including certain indirect costs, incurred in connection with our capital addition activities, at the point in time when activities necessary to get apartment communities ready for their intended use are in progress. This includes 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 assets are substantially complete and ready for their intended use, which is typically when construction has been completed and apartment homes are available for occupancy. We charge to property operating expense, as incurred, costs including ordinary repairs, maintenance and resident turnover costs. We depreciate capitalized costs using the straight-line method over the estimated useful life of the related component or improvement, which is generally 5 , 15 or 30 years. All capitalized site payroll and indirect costs are allocated proportionately, based on direct costs, among capital projects and depreciated over the estimated useful lives of such projects. 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, 2015 , 2014 and 2013 , we capitalized to buildings and improvements $11.7 million , $14.2 million and $17.6 million of interest costs, respectively, and $28.2 million , $29.2 million and $33.2 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 property. Based on periodic tests of recoverability of long-lived assets, for the year ended December 31, 2014 , we recorded a provision for real estate impairment losses of $1.8 million related to sold apartment communities, and we recorded no such provisions during the years ended December 31, 2015 and 2013 . 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, 2015 and 2014 , other assets was comprised of the following amounts (dollars in thousands): 2015 2014 Deferred financing costs, net $ 26,126 $ 30,320 Investments in unconsolidated real estate partnerships 15,401 16,046 Investments in securitization trust that holds Aimco property debt 65,502 61,043 Intangible assets, net 45,447 49,441 Deferred tax asset, net (Note 8) 26,117 252 Assets related to the legacy asset management business (Note 3) 156,389 161,135 Prepaid expenses, accounts and notes receivable, deposits and other 138,936 158,490 Other assets per consolidated balance sheets $ 473,918 $ 476,727 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. 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. 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, our share of the earnings or losses of the entity for the periods being presented is included in equity in earnings or losses from unconsolidated real estate partnerships (within other, net in our consolidated statements of operations), inclusive of our share of any impairments and disposition gains recognized by and related to such entities. The excess of the cost of the acquired partnership interests over the historical carrying amount of partners’ equity or deficit is ascribed generally 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 a component of equity in earnings or losses from unconsolidated real estate partnerships. Investments in Securitization Trust that holds Aimco Property Debt We hold investments in a securitization trust which 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 6 for further information regarding these securities. Intangible Assets At December 31, 2015 and 2014 , other assets included goodwill associated with our reportable segments of $43.9 million and $45.1 million , respectively. We perform an annual impairment test of goodwill that compares the fair value of reporting units with their carrying amounts, including goodwill. We determined that our goodwill was not impaired in 2015 , 2014 or 2013 . During the years ended December 31, 2015 , 2014 and 2013 , we allocated $1.2 million , $3.9 million and $5.5 million , respectively, of goodwill related to our reportable segments (conventional and affordable real estate operations) 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 and the retained portions of the reporting units to which the goodwill as allocated. Intangible assets also includes amounts related to in-place leases as discussed under the Acquisition of Real Estate Assets and Related Depreciation and Amortization heading. Capitalized Software Costs Purchased software and other costs related to software 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 five years. For the years ended December 31, 2015 , 2014 and 2013 , we capitalized software purchase and development costs totaling $3.6 million , $4.4 million and $3.3 million , respectively. At December 31, 2015 and 2014 , other assets included $16.4 million and $19.7 million of net capitalized software, respectively. During the years ended December 31, 2015 , 2014 and 2013 , we recognized amortization of capitalized software of $6.9 million , $6.7 million and $8.9 million , respectively, which is included in depreciation and amortization in our consolidated statements of operations. 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. However, as discussed in Note 3 , we continue to consolidate certain partnerships and apartment communities associated with the legacy asset management business for which the derecognition criteria associated with our sale of the portfolio have not been met. We do not control the execution of sales and other events related to the assets that will lead to the to the liquidation of these partnerships and derecognition of the associated noncontrolling interests. The aggregate carrying amount of noncontrolling interests in consolidated real estate partnerships totaled $151.4 million and $233.3 million at December 31, 2015 and 2014 , respectively. These noncontrolling interests included $0.1 million (deficit) and $44.1 million , respectively, associated with the noncontrolling interests in the legacy asset management business at December 31, 2015 and 2014 . 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, 2015 , 2014 and 2013 is shown in our consolidated statements of equity and partners’ capital and further discussed in Note 3 . 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 sales of real estate and accordingly the effect on our equity and partners’ capital is reflected within the the amount of net income attributable to us and to noncontrolling interests. In accordance with FASB Accounting Standards Codification, or ASC, Topic 810, 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, HPUs and preferred OP Units. Within Aimco’s consolidated financial statements, the Aimco Operating Partnership’s income or loss is allocated to the holders of common partnership units and equivalents based on the weighted average number of common partnership units (including those held by Aimco) and equivalents outstanding during the period. During the years ended December 31, 2015 , 2014 and 2013 , the holders of common OP Units and equivalents had a weighted average ownership interest in the Aimco Operating Partnership of 4.7% , 5.0% and 5.2% , respectively. Holders of the preferred OP Units participate in the Aimco Operating Partnership’s income or loss only to the extent of their preferred distributions. See Note 10 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 property management, asset management, syndication and other services when the related fees are earned and are realized or realizable. Insurance We believe that 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 insurance coverage for substantial portions of our property, workers’ compensation, health, and general liability exposures. Losses are accrued 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 related to restricted stock awards and employee stock options, based on the grant date fair value and recognize compensation cost, net of forfeitures, over the awards’ requisite service periods. See Note 11 for further discussion of our share-based compensation. Tax Credit Arrangements We sponsor certain partnerships that operate qualifying affordable housing apartment communities and 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 . Typically, we are the general partner with a legal ownership interest of one percent or less and unaffiliated institutional investors (which we refer to as tax credit investors or investors) acquire the limited partnership interests ( at least 99% ). At inception, each investor agrees to fund capital contributions to the partnerships and we receive a syndication fee from the partnerships upon the investors’ admission to the partnership. We have determined that the partnerships in these arrangements are VIEs and, where we are general partner, we are generally the primary beneficiary that is required to consolidate the partnerships. 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 account for these partnerships as wholly-owned subsidiaries, recognizing the income or loss generated by the underlying real estate based on our economic interest in the partnerships. 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 sheet 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. Income Taxes We have elected to be taxed as a REIT under the Code commencing with our taxable year ended December 31, 1994, and intend to continue to operate in such a manner. Our current and continuing qualification as a REIT depends on our ability to meet the various requirements imposed by the 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 we qualify for taxation as a REIT, we will generally not be subject to United States Federal corporate income tax on our 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 we qualify as a REIT, we may be subject to United States Federal income and excise taxes in various situations, such as on our undistributed income. We also will be required to pay a 100% tax on any net income on non-arm’s length transactions between us and a TRS (described below) and on any net income from sales of apartment communities that were held for sale to customers in the ordinary course. In addition, we could also be subject to the alternative minimum tax, or AMT, on our items of tax preference. The state and local tax laws may not conform to the United States Federal income tax treatment, and we 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, asset 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. We recognize the tax consequences associated with intercompany transfers between the REIT and TRS entities when the related assets affect our GAAP income or loss, generally through depreciation, impairment losses, or sales to third party entities. Refer to Note 8 for further information about our income taxes. Discontinued Operations In April 2014, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, or ASU 2014-08. ASU 2014-08 revised the definition of, and the requirements for reporting, a “discontinued operation.” Specifically, ASU 2014-08 revised the reporting requirements to only allow a component of an entity, or group of components of an entity, to be reported in discontinued operations if their disposal represents a “strategic shift that has (or will have) a major effect on an entity’s operations and financial results.” For public companies, ASU 2014-08 was required to be applied prospectively to disposals of components of an entity or classifications as held for sale of components of an entity that occur in annual periods commencing after December 15, 2014; however, as permitted by the transition provisions, we elected to adopt ASU 2014-08 effective January 1, 2014, for disposals (or classifications as held for sale) that had not been reported in financial statements previously issued. Under ASU 2014-08, we believe routine sales of apartment communities and certain groups of apartment communities generally do not meet the requirements for reporting within discontinued operations. In accordance with GAAP prior to our adoption of ASU 2014-08, we reported the results of apartment communities that met the definition of a component of an entity and had been sold or met the criteria to be classified as held for sale as discontinued operations. For years ended December 31, 2013, or earlier, and interim periods within those years, we included the results of such apartment communities, including any gain or loss on their disposition, less applicable income taxes, in income from discontinued operations within the consolidated statements of operations. See Note 12 for additional information regarding discontinued operations. 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 6 , 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, 2015 , 2014 and 2013 , along with the corresponding amounts of such comprehensive income attributable to Aimco, the Aimco Operating Partnership and to noncontrolling interests, is presented within the accompanying consolidated statements of comprehensive income. Earnings per Share and Unit Aimco calculates earnings (loss) per share based on the weighted average number of shares of Common Stock, participating securities, common stock equivalents and dilutive convertible securities outstanding during the period. The Aimco Operating Partnership calculates earnings (loss) per unit based on the weighted average number of common partnership units and equivalents, participating securities and dilutive convertible securities outstanding during the period. The Aimco Operating Partnership considers both common partnership units and HPUs, which have identical rights to distributions and undistributed earnings, to be common units for purposes of the earnings per unit computations. See Note 13 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. Recent Accounting Pronouncements In May 2014, the FASB and International Accounting Standards Board issued their final standard on revenue from contracts with customers, which was issued by the FASB as Accounting Standards Update 2014-09, Revenue from Contracts with Customers , or ASU 2014-0

Significant Transactions

Significant Transactions	12 Months Ended
	Dec. 31, 2015
Significant Transactions [Abstract]
Significant Transactions [Text Block]	Significant Transactions Acquisitions of Apartment Communities During the year ended December 31, 2015 , we acquired conventional apartment communities located in Atlanta, Georgia and Cambridge, Massachusetts and during the year ended December 31, 2014 , we acquired conventional apartment communities located in San Jose, California, Aurora, Colorado, Boulder, Colorado, Atlanta, Georgia and New York, New York. Summarized information regarding these acquisitions is set forth in the table below (dollars in thousands): Year Ended December 31, 2015 2014 Number of apartment communities 3 6 Number of apartment homes 300 1,182 Acquisition price $ 129,150 $ 291,925 Non-recourse property debt assumed (outstanding principal balance) — 65,200 Non-recourse property debt assumed (fair value) — 64,817 Total fair value allocated to land 10,742 70,961 Total fair value allocated to buildings and improvements 118,366 217,851 During the year ended December 31, 2014 , we also purchased entities that own 2.4 acres in the heart of downtown La Jolla, California, adjoining and overlooking La Jolla Cove and the Pacific Ocean. The property, which is zoned for multifamily and mixed-use, is currently occupied by three small commercial buildings and a limited-service hotel, which is managed for us by a third party. Asset Management Business Disposition On December 19, 2012, we sold the Napico portfolio, our legacy asset management business. The transaction was primarily seller-financed, and the associated notes are scheduled to be repaid from the operation and liquidation of the Napico portfolio and are collateralized by the buyer’s interests in the portfolio. In accordance with the provisions of GAAP applicable to sales of real estate or interests therein, for accounting purposes, we have not recognized the sale and are accounting for the transaction under the profit sharing method. Until full payment has been received for the seller-financed notes or we otherwise meet the requirements to recognize the sale for accounting purposes, we will continue to recognize the portfolio’s assets and liabilities, each condensed into single line items within other assets and accrued liabilities and other, respectively, in our consolidated balance sheets, for all dates following the transaction. Similarly, we will continue to recognize the portfolio’s results of operations, also condensed into a single line item within our consolidated statements of operations, for periods subsequent to the transaction. In January 2016, we received final payment on the first of the two seller-financed notes and the buyer was in compliance with the terms of the second seller-financed note. At December 31, 2015 , the Napico portfolio consisted of 14 partnerships that held investments in 12 apartment communities that were consolidated and 44 apartment communities that were accounted for under the equity or cost methods of accounting. The portfolio’s assets and liabilities included in other assets in our consolidated balance sheets are summarized below (in thousands). December 31, 2015 2014 Real estate, net $ 108,119 $ 117,851 Cash and cash equivalents 33,725 23,133 Investment in unconsolidated real estate partnerships and other assets 14,545 20,151 Total assets $ 156,389 $ 161,135 Total indebtedness $ 148,761 $ 113,641 Accrued and other liabilities 7,055 4,417 Total liabilities 155,816 118,058 Noncontrolling interests in consolidated real estate partnerships (111 ) 44,106 Equity attributable to Aimco and the Aimco Operating Partnership 684 (1,029 ) Total liabilities and equity $ 156,389 $ 161,135 During the year ended December 31, 2015 , Napico sold several consolidated apartment communities, resulting in the reduction of real estate, and Napico refinanced several apartment communities, resulting in a significant increase in indebtedness and a corresponding reduction in noncontrolling interests in consolidated real estate partnerships, following the distribution of approximately $38.9 million of such proceeds. Summarized information regarding the Napico portfolio’s results of operations, including any expense we recognize under the profit sharing method, is shown below in thousands. The net (loss) income related to Napico (before noncontrolling interests) is included in other, net in our consolidated statements of operations. Year Ended December 31, 2015 2014 2013 Revenues $ 26,203 $ 27,701 $ 23,711 Expenses (21,520 ) (21,472 ) (21,188 ) Equity in earnings or loss of unconsolidated entities, gains or losses on dispositions and other, net (4,495 ) (6,996 ) (748 ) Net income (loss) related to legacy asset management business 188 (767 ) 1,775 Income tax (expense) benefit associated with legacy asset management business (1,967 ) 3 (639 ) Noncontrolling interests in consolidated real estate partnerships 5,420 (403 ) 21,370 Net income (loss) of legacy asset management business attributable to Aimco and the Aimco Operating Partnership $ 3,641 $ (1,167 ) $ 22,506 The results of operations for the consolidated apartment communities sold by the owner of this portfolio through December 31, 2013 , are presented within income from discontinued operations in our consolidated statement of operations for the year ended December 31, 2013 , and are excluded from the summary above. Revenues increased during the year ended December 31, 2014 , as compared to the year ended December 31, 2013 , due to an adjustment to increase subsidized rents to reflect current market rates for one of the apartment communities in this portfolio. Based on our limited economic ownership in this portfolio, most of the assets and liabilities are allocated to noncontrolling interests and do not significantly affect our consolidated equity or partners’ capital. Additionally, the operating results of this portfolio generally have an insignificant effect on the amounts of income or loss attributable us, except as it relates to the consolidated partnerships within this portfolio that sell their final investments and commence dissolution, which results in the derecognition of all remaining noncontrolling interest balances associated with these partnerships. During 2013, noncontrolling interests in consolidated real estate partnerships reflects a benefit of $20.6 million to Aimco and the Aimco Operating Partnership’s share of net income for the derecognition of such noncontrolling interest balances. We consolidated the majority of these entities in connection with our adoption of a new accounting principle in 2010, and at that time recognized a large cumulative effect of a change in accounting principle charge to our equity and partners’ capital. This adjustment represented the cumulative charges to earnings we would have recognized for any distributions or losses allocable to noncontrolling interests in excess of the carrying amount of the associated noncontrolling interest balances had we consolidated these entities from the period of our initial involvement. Income or loss attributable to these noncontrolling interests will continue to be recognized commensurate with the recognition of the results of operations of the portfolio. If payment is received on the remaining seller-financed note or we otherwise meet the requirements to recognize the sale for accounting purposes, we expect to recognize a gain attributable to Aimco and the Aimco Operating Partnership.

Investments in Unconsolidated R

Investments in Unconsolidated Real Estate Partnerships	12 Months Ended
	Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Investments in Unconsolidated Real Estate Partnerships	Investments in Unconsolidated Real Estate Partnerships At December 31, 2015 , 2014 and 2013 , we owned general and limited partner interests in unconsolidated real estate partnerships that owned 11 , 11 and 20 apartment communities, respectively. At December 31, 2015 , our ownership interests in these unconsolidated real estate partnerships ranged from 40% to 67% . The following table provides selected combined financial information for the unconsolidated real estate partnerships in which we had investments accounted for under the equity method as of and for the years ended December 31, 2015 , 2014 and 2013 (in thousands): 2015 2014 2013 Total assets $ 84,796 $ 85,492 $ 93,242 Total liabilities 52,685 54,472 64,859 Partners’ capital 32,111 31,020 28,383 Rental and other property revenues 12,193 12,978 16,268 Property operating expenses (5,473 ) (6,233 ) (8,470 ) Depreciation and amortization (1,841 ) (3,081 ) (3,300 ) Interest expense (2,520 ) (2,785 ) (4,185 ) Gain on sale and impairment losses, net — — 36,212 Net income 1,720 688 35,909 At December 31, 2015 , our aggregate recorded investment in unconsolidated partnerships of $15.4 million was less than our share of the partners' capital or deficit by approximately $0.8 million . At December 31, 2014 , our aggregate recorded investment in unconsolidated partnerships of $16.0 million exceeded our share of the partners’ capital or deficit recognized in the underlying partnerships’ financial statements by approximately $0.4 million .

Non-Recourse Property Debt and

Non-Recourse Property Debt and Credit Agreement	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Non-Recourse Property Debt and Credit Agreement	Non-Recourse Property Debt and Credit Agreement Non-Recourse Property Debt We finance our apartment communities primarily using long-dated, fixed-rate borrowings, each of which is collateralized by a single apartment community and is non-recourse to us. The following table summarizes our property debt related to assets classified as held for use at December 31, 2015 and 2014 (dollars in thousands): Principal Outstanding 2015 2014 Fixed rate property debt $ 3,761,238 $ 3,902,642 Variable rate property debt 84,922 120,167 Total property debt $ 3,846,160 $ 4,022,809 Fixed rate property debt matures at various dates through February 2061 , and has interest rates that range from 2.28% to 8.50% , with a weighted average interest rate of 5.10% . Principal and interest are generally payable monthly or in monthly interest-only payments with balloon payments due at maturity. At December 31, 2015 , each of our fixed rate loans payable related to apartment communities classified as held for use were secured by one of 153 apartment communities that had an aggregate gross book value of $6.7 billion . Variable rate property debt matures at various dates through July 2033 , and has interest rates that range from 0.05% to 1.86% , with a weighted average interest rate of 1.55% . Principal and interest on this debt is generally payable in semi-annual installments with balloon payments due at maturity. At December 31, 2015 , our variable rate property debt related to apartment communities classified as held for use were each secured by one of four apartment communities that had an aggregate gross book value of $165.8 million . Our non-recourse property debt instruments contain covenants common to the type of borrowing, and at December 31, 2015 , we were in compliance with all such covenants. As of December 31, 2015 , the scheduled principal amortization and maturity payments for our non-recourse property debt related to apartment communities classified as held for use are as follows (in thousands): Amortization Maturities Total 2016 $ 76,798 $ 249,175 $ 325,973 2017 75,472 325,853 401,325 2018 73,698 207,616 281,314 2019 68,418 518,323 586,741 2020 61,731 303,741 365,472 Thereafter 1,885,335 $ 3,846,160 As of December 31, 2015 , our unencumbered pool included 25 consolidated apartment communities and had an estimated fair value of $1.8 billion . At December 31, 2015 , we also had two recently acquired consolidated apartment communities which we anticipate encumbering but for which financing was not yet in place. 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 under the Credit Agreement bear interest at a rate set forth on a pricing grid, which rate varies based on our leverage (either at LIBOR, plus 1.35%, or, at our option, Prime plus 0.35% at December 31, 2015 ). The Credit Agreement matures in September 2017 , and may be extended for an additional one-year period , subject to certain conditions. 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 . As of December 31, 2015 , we had $27.0 million of outstanding borrowings under our Credit Agreement, and we had the capacity to borrow $536.6 million , net of the outstanding borrowings and $36.4 million for undrawn letters of credit backed by the Credit Agreement. The interest rate on our outstanding borrowings was 1.59% at December 31, 2015 . As of December 31, 2014 , we had $112.3 million of outstanding borrowings under our Credit Agreement, and the interest rate on our outstanding borrowings was 2.08% . The proceeds of revolving loans are generally used for working capital and other short-term purposes.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2015
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) securities, and our interest rate swaps. Information regarding these items measured at fair value, both of which are classified within Level 2 of the GAAP fair value hierarchy, is presented below (in thousands): AFS Investments Interest Rate Swaps Total Fair value at December 31, 2013 $ 58,408 $ (4,604 ) $ 53,804 Investment accretion 3,827 — 3,827 Unrealized losses included in interest expense — (48 ) (48 ) Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss — 1,685 1,685 Unrealized losses included in equity and partners’ capital (1,192 ) (2,306 ) (3,498 ) Fair value at December 31, 2014 $ 61,043 $ (5,273 ) $ 55,770 Investment accretion 4,245 — 4,245 Unrealized losses included in interest expense — (44 ) (44 ) Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss — 1,678 1,678 Unrealized gains (losses) included in equity and partners’ capital 214 (1,299 ) (1,085 ) Fair value at December 31, 2015 $ 65,502 $ (4,938 ) $ 60,564 Our investments classified as AFS are presented within other assets in the accompanying consolidated balance sheets. We hold positions in the securitization which pay interest currently, and we also hold the first loss position in the securitization 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, 2015 , was approximately 5.4 years. Our amortized cost basis for these investments, which represents the original cost adjusted for interest accretion less interest payments received, was $67.8 million and $63.6 million at December 31, 2015 and 2014 , respectively. We estimate the fair value of these investments in accordance with GAAP 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, which typically moves in an inverse relationship with the movements in interest rates, exceeded the amortized cost of these investments at the balance sheet dates. The fair value of the first loss position, which is less correlated to movements in interest rates, was less than the amortized cost at the balance sheet dates. We currently expect to hold the investments to their maturity dates and we believe we will fully recover our basis in the investments. Accordingly, we believe the current impairment in the fair value, as compared to the amortized cost basis, of the first loss position is temporary and we have not recognized any of the loss in value in earnings. For our variable rate debt, we are sometimes required by limited partners in our consolidated real estate partnerships to limit our exposure to interest rate fluctuations by entering into interest rate swap agreements, which moderate our exposure to interest rate risk by effectively converting the interest on variable rate debt 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. As of December 31, 2015 and 2014 , we had interest rate swaps with aggregate notional amounts of $49.9 million and $50.3 million , respectively. As of December 31, 2015 , these swaps had a weighted average remaining term of 5.0 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 in 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, 2015 , remain constant, we estimate that during the next 12 months, we would reclassify into earnings approximately $1.7 million of the unrealized losses in accumulated other comprehensive loss. If market interest rates increase above the 3.43% 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 aggregate fair value of our cash and cash equivalents, receivables and payables approximates their aggregate carrying amounts at December 31, 2015 and 2014 , due to their relatively short-term nature and high probability of realization. The estimated aggregate fair value of our consolidated total indebtedness was approximately $4.0 billion and $4.4 billion at December 31, 2015 and 2014 , respectively, as compared to aggregate carrying amounts of $3.9 billion and $4.1 billion , respectively. Substantially all of the difference between the fair value and the carrying value relates to apartment communities we wholly own. 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 assets 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.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments In connection with our development, redevelopment and capital improvement activities, we have entered into various construction-related contracts and we have made commitments to complete certain projects, pursuant to financing or other arrangements. As of December 31, 2015 , our commitments related to these capital activities totaled approximately $110.0 million , most of which we expect to incur during the next 12 months. Our commitments related to our One Canal development project will be funded in part by a $114.0 million non-recourse property loan, of which $27.8 million was available to draw at December 31, 2015 . During July 2015, we entered into a contract to acquire an apartment community currently under construction in Northern California for $320.0 million , for which we have provided a nonrefundable deposit of $25.0 million . The acquisition is expected to close upon completion of construction in the summer of 2016. We intend to fund a portion of the acquisition through a property loan and the balance with proceeds from the sale of two apartment communities. 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 We are required to manage certain consolidated real estate partnerships in compliance with various laws, regulations and contractual provisions that apply to our 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 and require a refund or reduction of investor capital contributions, which are reported as deferred income in our consolidated balance sheet, until such time as our obligation to deliver tax benefits is relieved. The remaining compliance periods for our tax credit syndication arrangements range from less than one year to 10 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. Limited Partnerships In connection with our acquisitions of interests in real estate partnerships, we are sometimes subject to legal actions, including allegations that such activities may involve breaches of fiduciary duties to the partners of such real estate partnerships or violations of the relevant partnership agreements. We may incur costs in connection with the defense or settlement of such litigation. We believe that we comply with our fiduciary obligations and relevant partnership agreements. Although the outcome of any litigation is uncertain, we do not expect any such legal actions 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. Potentially hazardous materials may include polychlorinated biphenyls, petroleum-based fuels, lead-based paint, or asbestos. 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, damages to natural resources and for potential fines or penalties in connection with such damage or with respect to the improper management of hazardous materials. 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 at an apartment community. 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, 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 EPA alleges that we are liable for addressing the contamination in the residential area because a dry cleaner that operated on our former property, prior to our ownership, discharged hazardous materials into the sanitary sewers and the environment. We have undertaken a voluntary remediation of the dry cleaner contamination at our former property under the oversight of the Indiana Department of Environmental Management, or IDEM. However, IDEM has formally sought to terminate us from the voluntary remediation, and we are presently appealing that termination. Based on our review of the scientific data, we believe that the presence of hazardous materials in the separate residential area under review by the EPA is attributable to neighboring property owners (including an auto parts manufacturer), and not the dry cleaner. The EPA is now proposing to list the area on the National Priorities List (i.e., as a Superfund site), which would make the site eligible for additional Federal funding. We have filed formal comments with the EPA opposing the proposed listing. Were the site to be listed, the EPA could use the funding to further investigate and clean-up the residential area and could then seek to recoup its costs from responsible parties. Although the outcome of this process is uncertain, we do not expect the 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 regarding environmental issues allegedly stemming from the historic operation of a dry cleaner on the site. An entity owned by us was the former general partner of a now-dissolved company that previously owned the dry cleaner site. 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. Lahontan, recently tested domestic wells in the area and found two wells with contaminants linked to dry cleaning. We entered into an agreement with Lahontan and the current owner to pay for an alternative water connection at an insignificant cost and have fulfilled our obligations under that agreement. During September 2015, Lahontan sent us and the current owner a proposed cleanup and abatement order that, if entered, would require us and the current owner to perform additional groundwater investigation and corrective actions with respect to onsite and offsite contamination. We are currently assessing potential legal and technical grounds for challenging and/or narrowing the scope of the proposed order. Although the outcome of this process is uncertain, we do not expect the 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, 2015 , 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 and equipment. We are also obligated under non-cancelable operating leases for the ground under certain of our apartment communities with remaining terms ranging from 33 years to 69 years . Approximate minimum annual rental payments under operating leases are as follows (in thousands): Office and Equipment Lease Obligations Ground Lease Obligations Total Operating Lease Obligations 2016 $ 3,061 $ 795 $ 3,856 2017 2,361 895 3,256 2018 1,062 995 2,057 2019 226 1,095 1,321 2020 153 1,331 1,484 Thereafter — 67,876 67,876 Total $ 6,863 $ 72,987 $ 79,850 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 $3.2 million , $3.3 million and $4.2 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. Rent expense recognized for the ground leases totaled $0.9 million , $1.0 million and $ 0.9 million for the years ended December 31, 2015 , 2014 and 2013 , respectively and is included within interest expense in the accompanying statements of operations.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
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, 2015 2014 Deferred tax liabilities: Real estate and real estate partnership basis differences $ 31,726 $ 38,231 Deferred tax assets: Net operating, capital and other loss carryforwards $ 8,024 $ 6,699 Accruals and expenses 4,917 5,430 Tax credit carryforwards 49,036 29,714 Management contracts and other 333 267 Total deferred tax assets 62,310 42,110 Valuation allowance (4,467 ) (3,627 ) Net deferred income tax assets $ 26,117 $ 252 During the year ended December 31, 2015 , we increased the valuation allowance on a net basis by approximately $0.8 million with a minor effect on the effective tax rate. A reconciliation of the beginning and ending balance of our unrecognized tax benefits is presented below (in thousands): 2015 2014 2013 Balance at January 1 $ 2,286 $ 2,871 $ 3,536 Reductions as a result of a lapse of the applicable statutes — — (764 ) Additions (reductions) based on tax positions related to prior years and current year excess benefits related to stock-based compensation 611 (585 ) 99 Balance at December 31 $ 2,897 $ 2,286 $ 2,871 Because the statute of limitations has not yet elapsed, our United States Federal income tax returns for the year ended December 31, 2011, and subsequent years and certain of our State income tax returns for the year ended December 31, 2011, and subsequent years are currently subject to examination by the IRS or other taxing authorities. Approximately $2.3 million of unrecognized benefit, if recognized, would affect the effective rate. On March 19, 2014, the IRS notified the Aimco Operating Partnership of its intent to audit the 2011 and 2012 tax years. This audit remains in process as of December 31, 2015 . 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. At December 31, 2015 we had $1.6 million in cumulative excess tax benefits from employee stock option exercises and vested restricted stock awards. None of the excess tax benefits have yet been realized. Significant components of the income tax benefit or expense are as follows and are classified within income tax benefit in continuing operations, income from discontinued operations, net of tax, and gain on dispositions or real estate, net of tax, in our statements of operations for the years ended December 31, 2015 , 2014 and 2013 (in thousands): 2015 2014 2013 Current: Federal $ 1,310 $ — $ — State 1,357 970 63 Total current 2,667 970 63 Deferred: Federal (27,382 ) 11,556 7,621 State (1,052 ) 3,485 1,685 Total deferred (28,434 ) 15,041 9,306 Total (benefit) expense $ (25,767 ) $ 16,011 $ 9,369 Classification: Continuing operations $ (27,524 ) $ (20,047 ) $ (1,959 ) Discontinued operations $ — $ — $ 11,328 Gain on dispositions of real estate $ 1,757 $ 36,058 $ — Consolidated income or loss subject to tax consists of pretax income or loss of our TRS entities and gains or losses on certain apartment community sales that are subject to income tax under section 1374 of the Internal Revenue Code. For the year ended December 31, 2015 , our TRS entities had pretax losses of $31.3 million . For the years ended December 31, 2014 and 2013 , our TRS entities had pretax income of $137.0 million and $46.6 million , respectively. The reconciliation of income tax attributable to continuing and discontinued operations computed at the United States statutory rate to income tax (benefit) expense is shown below (dollars in thousands): 2015 2014 2013 Amount Percent Amount Percent Amount Percent Tax at United States statutory rates on consolidated income or loss subject to tax $ (10,947 ) 35.0 % $ 47,950 35.0 % $ 16,326 35.0 % State income tax expense, net of Federal tax (benefit) expense (361 ) 1.2 % 4,364 3.2 % 1,748 3.7 % Effect of permanent differences (27 ) 0.1 % (154 ) (0.1 )% (296 ) (0.6 )% Tax effect of intercompany transfers of assets between the REIT and TRS entities (1) (1,515 ) 4.8 % (23,969 ) (17.5 )% (4,272 ) (9.2 )% Tax credits (13,583 ) 43.4 % (12,271 ) (9.0 )% (4,137 ) (8.9 )% Increase in valuation allowance 666 (2.1 )% 91 0.1 % — — % Total income tax (benefit) expense $ (25,767 ) 82.4 % $ 16,011 11.7 % $ 9,369 20.0 % (1) Includes the effect of intercompany asset transfers between the Aimco Operating Partnership and TRS entities, for which tax is deferred and recognized as the assets affect GAAP income or loss, for example, through depreciation, impairment, or upon the sale of the asset to a third party. Income taxes paid totaled approximately $2.0 million , $1.7 million and $0.6 million , respectively, in the years ended December 31, 2015 , 2014 and 2013 , respectively. At December 31, 2015 , we had state net operating loss carryforwards, or NOLs, for which the deferred tax asset was approximately $8.0 million , before a valuation allowance of $4.5 million . The NOLs expire in years 2018 to 2032 . 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, 2015 , we had low-income housing and rehabilitation tax credit carryforwards of approximately $49.5 million for income tax purposes that expire in years 2024 to 2033 . The deferred tax asset related to these credits is approximately $49.0 million . 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, 2015 , 2014 and 2013 , dividends per share held for the entire year were estimated to be taxable as follows: 2015 2014 2013 Amount Percentage Amount Percentage Amount Percentage Ordinary income $ 0.36 30.2 % $ 0.01 0.6 % $ 0.17 17.9 % Capital gains 0.37 31.3 % 0.53 51.6 % 0.13 13.9 % Qualified dividends 0.17 14.5 % — — % — — % Unrecaptured Section 1250 gain 0.28 24.0 % 0.50 47.8 % 0.66 68.2 % $ 1.18 100.0 % $ 1.04 100.0 % $ 0.96 100.0 % We designated the per share amounts above as capital gain dividends in accordance with the requirements under the Code. Additionally, we designated as 2015 capital gain dividends, a like portion of preferred dividends.

Aimco Equity

Aimco Equity	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Aimco Equity	Aimco Equity Preferred Stock At December 31, 2015 and 2014 , Aimco had the following classes of perpetual preferred stock outstanding (dollars in thousands): Redemption Annual Dividend Rate Per Share (paid quarterly) Balance December 31, Date (1) 2015 2014 Class A Cumulative Preferred Stock, 5,000,000 shares authorized and 5,000,000 shares issued/outstanding 5/17/2019 6.88% $ 125,000 $ 125,000 Class Z Cumulative Preferred Stock, 4,800,000 shares authorized and 1,391,643 shares issued/outstanding, respectively 7/29/2016 7.00% 34,126 34,126 Series A Community Reinvestment Act (CRA) Preferred Stock, 240 shares authorized and zero and 54 shares issued/outstanding, respectively 6/30/2011 (2) — 27,000 Preferred stock per consolidated balance sheets $ 159,126 $ 186,126 (1) All classes of preferred stock are or were redeemable at our option on and after the dates specified. (2) The dividend rate was a variable rate per annum equal to the Three-Month LIBOR Rate (as defined in the articles supplementary designating the Series A Community Reinvestment Act Perpetual Preferred Stock, or CRA Preferred Stock) plus 1.25%, calculated as of the beginning of each quarterly dividend period . The rate at December 31, 2014 was 1.48% . All classes of preferred stock have a $0.01 per share par value, are pari passu with each other and are senior to our Common Stock. The holders of each class of preferred stock are generally not entitled to vote on matters submitted to stockholders. Dividends on all shares of preferred stock are subject to declaration by Aimco’s Board of Directors. Aimco’s Class A Preferred Stock and Class Z Preferred Stock have liquidation preferences per share of $25.00 . The following table summarizes our issuances of Class A Preferred Stock and Class Z Preferred Stock during the year ended December 31, 2014 (dollars in thousands, except per share amounts): Class A Cumulative Preferred Stock Class Z Cumulative Preferred Stock Number of shares of preferred stock issued 5,000,000 117,400 Price to public per share $ 25.00 $ 25.65 Underwriting discounts, commissions and transaction costs per share $ 0.85 $ 0.51 Net proceeds per share $ 24.15 $ 25.14 Net proceeds to Aimco $ 120,757 $ 2,901 Issuance costs (primarily underwriting commissions) recognized as an adjustment of additional paid-in capital $ 4,350 $ 110 In connection with Aimco’s preferred stock issuances, Aimco contributed the net proceeds to the Aimco Operating Partnership in exchange for an equal number of the corresponding class of partnership preferred units. During the year ended December 31, 2015 , Aimco redeemed the remaining outstanding shares, or $27.0 million in liquidation preference, of its CRA Preferred Stock. We reflected $0.7 million of issuance costs previously recorded as a reduction of additional paid-in capital as an adjustment of net income attributable to preferred stockholders for the year ended December 31, 2015 . During the year ended December 31, 2014 , Aimco repurchased 20 shares, or $10.0 million in liquidation preference, of its CRA Preferred Stock for cash totaling $9.5 million . We reflected the $0.5 million excess of the carrying value over the repurchase price, offset by $0.3 million of issuance costs previously recorded as a reduction of additional paid-in capital, as an adjustment of net income attributable to preferred stockholders for the year ended December 31, 2014 . In connection with the redemption and repurchase, the Aimco Operating Partnership repurchased from Aimco a number of Partnership Preferred Units equal to the number of shares redeemed or repurchased by Aimco. Common Stock 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. Using the proceeds from this offering, during the year ended December 31, 2015 , we repaid the then outstanding balance on our Credit Agreement, expanded our unencumbered asset pool, funded redevelopment and property upgrades investments that would otherwise have been funded with property debt, and redeemed the remaining outstanding shares of our Series A CRA Preferred Stock. Registration Statements Pursuant to an At-The-Market offering program active at December 31, 2015 , Aimco had the capacity to issue up to 3.5 million additional shares of its Common Stock. In the event of any such issuances by Aimco, the Aimco Operating Partnership would issue to Aimco a corresponding number of common partnership units in exchange for the proceeds. Additionally, 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, 2015
Partners' Capital [Abstract]
Partners' Capital	Partners’ Capital Partnership Preferred Units Owned by Aimco At December 31, 2015 and 2014 , the Aimco Operating Partnership had outstanding preferred units in classes and amounts similar to Aimco’s Preferred Stock discussed in Note 9 , or Partnership Preferred Units. All of these classes of Partnership Preferred Units were owned by Aimco during the periods presented. All classes of Partnership Preferred Units are pari passu with each other and are senior to the Aimco Operating Partnership’s common partnership units. None of the classes of Partnership Preferred Units have any 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 all Partnership Preferred Units are subject to being declared by the General Partner. All classes of the Partnership Preferred Units are redeemable by the Aimco Operating Partnership only in connection with a concurrent redemption by Aimco of the corresponding classes of Aimco Preferred Stock held by unrelated parties. As discussed in Note 9 , during the years ended December 31, 2015 and 2014 , Aimco completed various Preferred Stock issuances, redemptions and repurchases. In connection with these transactions, the Aimco Operating Partnership issued to Aimco or redeemed or repurchased from Aimco a corresponding number of Partnership Preferred Units. Redeemable Partnership Preferred 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, 2015 and 2014 , 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 2015 2014 2015 2014 Class One 8.75 % $ 8.00 90,000 90,000 $ 8,229 $ 8,229 Class Two 1.92 % $ 0.46 18,124 18,589 453 465 Class Three 7.88 % $ 1.97 1,341,289 1,341,485 33,532 33,537 Class Four 8.00 % $ 2.00 644,954 644,954 16,124 16,124 Class Six 8.50 % $ 2.13 790,883 790,883 19,772 19,772 Class Seven 7.87 % $ 1.97 27,960 27,960 699 699 Class Nine 6.00 % $ 1.50 364,668 364,668 9,117 9,117 Total 3,277,878 3,278,539 $ 87,926 $ 87,943 Each class of preferred OP Unit 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 redeemable preferred OP Units, subject to limited exceptions. Subject to certain conditions, the Class Four and Class Six preferred OP Units are convertible 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, 2015 , 2014 and 2013 , approximately 700 , 12,600 and 3,600 preferred OP Units, respectively, were tendered for redemption in exchange for cash, and no preferred OP Units were tendered for redemption in exchange for shares of Aimco Common Stock. The Class Nine preferred OP Units were issued as partial consideration for an asset acquisition during the year ended December 31, 2014. The following table presents a reconciliation of the Aimco Operating Partnership’s preferred OP Units during the years ended December 31, 2015 , 2014 and 2013 (dollars in thousands). 2015 2014 2013 Balance at January 1 $ 87,937 $ 79,953 $ 80,046 Preferred distributions (6,943 ) (6,409 ) (6,423 ) Redemption of preferred units and other (11 ) (1,221 ) (93 ) Issuance of preferred units — 9,117 — Net income 6,943 6,497 6,423 Balance at December 31 $ 87,926 $ 87,937 $ 79,953 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. 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, 2015 , 2014 and 2013 , approximately 112,000 , 268,000 and 105,000 common OP Units, respectively, were redeemed in exchange for cash, and no common OP Units were redeemed in exchange for shares of Common Stock. HPUs At December 31, 2015 and 2014 , the Aimco Operating Partnership had outstanding 2,339,950 HPUs. The holders of HPUs may redeem these units commencing after December 31, 2016 , on the basis of one HPU 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, at Aimco’s option. The holders of HPUs receive the same amount of distributions that are paid to holders of an equivalent number of common OP Units. The HPUs are classified within permanent capital as part of Limited Partners’ capital in the Aimco Operating Partnership’s consolidated balance sheets, and within permanent equity as part of common noncontrolling interests in the Aimco Operating Partnership within Aimco’s consolidated balance sheets.

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2015
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 plan to attract and retain officers, key employees and independent directors. In 2015 , our stockholders approved the 2015 Stock Award and Incentive Plan, or the 2015 Plan, to supplement and eventually replace our 2007 Stock Award and Incentive Plan, or the 2007 Plan. As of December 31, 2015 , approximately 150,000 shares were available for issuance under the 2007 Plan, and approximately 1.6 million shares were available for issuance under the 2015 Plan. The total number of shares available for issuance under the 2015 Plan may be increased by an additional 2.3 million shares to the extent of any forfeiture, cancellation, exchange, surrender, termination or expiration of an award outstanding under the 2007 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. The term of the options is generally ten years from the date of grant and the options typically vest over a period of four years from the date of grant. Total compensation cost recognized for stock based awards was $7.2 million , $6.1 million and $5.9 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. Of these amounts, $0.5 million , $0.3 million and $0.3 million , respectively, were capitalized. At December 31, 2015 , total unvested compensation cost not yet recognized was $11.3 million . We expect to recognize this compensation over a weighted average period of approximately 1.8 years . Stock Options The following table summarizes activity for our outstanding stock options, with service conditions (i.e. time-based vesting that requires continuous employment) for the years ended December 31, 2015 , 2014 and 2013 (numbers of options in thousands): 2015 2014 2013 Number of Options Weighted Number of Options Weighted Number of Options Weighted Outstanding at beginning of year 1,640 $ 28.91 2,991 $ 28.48 3,045 $ 28.39 Granted 239 39.05 — — — — Exercised (484 ) 28.33 (1,347 ) 27.97 (44 ) 22.52 Forfeited (1 ) 25.78 (4 ) 25.45 (10 ) 27.82 Outstanding at end of year 1,394 $ 30.85 1,640 $ 28.91 2,991 $ 28.48 Exercisable at end of year 1,155 $ 29.16 1,640 $ 28.91 2,991 $ 28.48 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. Options outstanding at December 31, 2015 , had an aggregate intrinsic value of $13.6 million and a weighted average remaining contractual term of 3.2 years . Options exercisable at December 31, 2015 , had an aggregate intrinsic value of $13.4 million and a weighted average remaining contractual term of 2.0 years . The intrinsic value of stock options exercised during the years ended December 31, 2015 , 2014 and 2013 , was $5.5 million , $10.0 million and $0.3 million , respectively. We estimated the fair value of options granted during the year ended December 31, 2015 using a Black-Scholes closed-form valuation model using the assumptions set forth in the table below. The expected term of the options was based on historical option exercises and post-vesting terminations. Expected volatility reflects an average of the historical volatility of our 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 expected dividend yield reflects expectations regarding cash dividend amounts per share paid on Aimco’s Common Stock during the expected term of the option and 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 weighted average fair value of options and our valuation assumptions for the 2015 grants were as follows: 2015 Weighted average grant-date fair value $ 6.97 Assumptions: Risk-free interest rate 1.68 % Expected dividend yield 2.87 % Expected volatility 25.19 % Weighted average expected life of options 5.5 years We recognize compensation expense associated with stock options ratably over the requisite service periods, which are typically four years . Time-Based Restricted Stock Awards The following table summarizes activity for restricted stock awards with service conditions, or Time-Based Restricted Stock awards, for the years ended December 31, 2015 , 2014 and 2013 (numbers of shares in thousands): 2015 2014 2013 Number of Shares Weighted Number of Shares Weighted Number of Shares Weighted Unvested at beginning of year 513 $ 26.34 575 $ 25.28 526 $ 22.69 Granted 145 39.39 196 26.69 253 27.86 Vested (259 ) 27.54 (238 ) 24.07 (204 ) 21.81 Forfeited (60 ) 32.29 (20 ) 26.26 — — Unvested at end of year 339 $ 29.96 513 $ 26.34 575 $ 25.28 The aggregate fair value of shares that vested during the years ended December 31, 2015 , 2014 and 2013 was $10.4 million , $6.7 million and $5.7 million , respectively. We recognize compensation expense associated with Time-Based Restricted Stock awards ratably over the requisite service periods, which are typically four years . TSR Restricted Stock Awards During 2015, Aimco’s stockholders approved the 2015 Plan, which provides for grants of performance based compensation. A portion of long-term incentive, or LTI, compensation granted in 2015 was in the form of restricted stock awards conditioned on Aimco’s relative total shareholder return, or TSR, as compared to the NAREIT Apartment Index ( 60% weighting) and the MSCI US REIT Index ( 40% weighting) over a forward looking, performance period of three years . Earned awards (if any) will vest 50% on the third anniversary of the grant date and 50% on the fourth anniversary of the grant date, based on continued employment. Prior to the vesting, dividends payable on the awards are deferred and subject to the same forfeiture provisions as the awards. The following table summarizes activity for TSR Restricted Stock awards for the year ended December 31, 2015 (numbers of shares in thousands): 2015 Number of Shares Weighted Unvested at beginning of year — $ — Granted 142 39.72 Forfeited (19 ) 39.72 Unvested at end of year 123 $ 39.72 The grant date fair value for the TSR Restricted Stock awards, which was calculated using a Monte Carlo model, and certain of the assumptions used in such calculation for awards granted in 2015 are set forth below: 2015 Grant date fair value $ 39.72 Baseline common share value $ 39.05 Dividend yield 2.87 % Expected volatility of common shares 19.48 % Risk-free interest rate 1.04 % Derived vesting period 3.4 years We recognize compensation expense related to the TSR Restricted Stock awards, which have graded vesting periods, over the requisite service period for each separate vesting tranche of the award, commencing on the grant date. These awards have market conditions in addition to service conditions that must be met for the awards to vest. The value of the awards takes into consideration the probability that the awards will ultimately vest; therefore previously recorded compensation expense is not adjusted in the event that the market condition is not achieved.

Assets Held for Sale and Discon

Assets Held for Sale and Discontinued Operations	12 Months Ended
	Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Assets Held for Sale and Discontinued Operations	Assets Held for Sale and Discontinued Operations As discussed in Note 2, during the year ended December 31, 2014, we adopted ASU 2014-08, which revised the definition of, and the requirements for reporting, a “discontinued operation.” Under ASU 2014-08, we believe routine sales of apartment communities and certain groups of apartment communities generally will not meet the requirements for reporting within discontinued operations. Summarized information regarding apartment communities sold during the years ended December 31, 2015 and 2014 is set forth in the table below (dollars in thousands): Year Ended December 31, 2015 2014 Apartment communities sold 11 30 Apartment homes sold 3,855 9,067 Income before income taxes and discontinued operations $ 14,191 $ 55,122 The results of operations for the years ended December 31, 2015 and 2014 , of the apartment communities sold during these periods are reflected within income from continuing operations in our consolidated statements of operations and the related gains on sale are reflected as gain on dispositions of real estate, net of tax, within our consolidated statements of operations. We report gains on disposition net of incremental direct costs incurred in connection with the transactions, including any prepayment penalties incurred upon repayment of property debt collateralized by the apartment communities being sold. Such prepayment penalties totaled $25.8 million for consolidated dispositions during the year ended December 31, 2015 ( $16.6 million of which represented the mark-to-market adjustment), and $25.2 million for consolidated dispositions during the year ended December 31, 2014 ( $16.6 million of which represented the mark-to-mark adjustments). We are currently 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 apartment communities meet the criteria to be classified as held for sale. As of December 31, 2015 , we had one apartment community with 96 apartment homes classified as held for sale. In accordance with GAAP prior to our adoption of ASU 2014-08, we reported as discontinued operations apartment communities that met the definition of a component of an entity and had been sold or met the criteria to be classified as held for sale. For the year ended December 31, 2013 , we included the results of such apartment communities, including any gain or loss on their disposition, less applicable income taxes, in income from discontinued operations within the consolidated statements of operations. During the year ended December 31, 2013 , we sold 29 consolidated apartment communities with an aggregate of 6,953 apartment homes. The summary results of operations for the year ended December 31, 2013 , for those apartment communities sold as of December 31, 2013 , and gains related to apartment communities sold during the year ended December 31, 2013 , are included in discontinued operations and are summarized below, along with the related amounts of income from discontinued operations attributable to Aimco, the Aimco Operating Partnership and noncontrolling interests (in thousands). 2013 Income before gain on dispositions of real estate and income tax $ 2,098 Gain on dispositions of real estate 212,459 Income tax expense (11,328 ) Income from discontinued operations, net of tax $ 203,229 Income from discontinued operations attributable to noncontrolling interests in consolidated real estate partnerships (31,842 ) Income from discontinued operations attributable to the Aimco Operating Partnership $ 171,387 Income from discontinued operations attributable to noncontrolling interests in Aimco Operating Partnership (9,248 ) Income from discontinued operations attributable to Aimco $ 162,139 Gain on dispositions is net of incremental direct costs incurred in connection with the transactions, including $16.5 million of prepayment penalties incurred upon repayment of property debt collateralized by the apartment communities sold in the year ended December 31, 2013 ( $6.1 million of which represented the mark-to-market adjustments). For periods prior to our adoption of ASU 2014-08, we classified interest expense related to property debt within discontinued operations when the related apartment community was sold or classified as held for sale.

Earnings (Loss) per Share_Unit

Earnings (Loss) per Share/Unit	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings (Loss) per Share/Unit	Earnings (Loss) per Share/Unit Aimco The following table illustrates Aimco’s calculation of basic and diluted earnings (loss) per share for the years ended December 31, 2015 , 2014 and 2013 (in thousands, except per share data): 2015 2014 2013 Numerator: Income from continuing operations $ 91,390 $ 67,475 $ 34,596 Gain on dispositions of real estate, net of tax 180,593 288,636 — (Income) loss from continuing operations and gain on dispositions attributable to noncontrolling interests (23,273 ) (46,862 ) 10,555 Income attributable to preferred stockholders (11,794 ) (7,947 ) (2,804 ) Income attributable to participating securities (950 ) (1,082 ) (813 ) Income from continuing operations attributable to Aimco common stockholders $ 235,966 $ 300,220 $ 41,534 Income from discontinued operations, net of tax $ — $ — $ 203,229 Income from discontinued operations attributable to noncontrolling interests — — (41,090 ) Income from discontinued operations attributable to Aimco common stockholders $ — $ — $ 162,139 Net income $ 271,983 $ 356,111 $ 237,825 Net income attributable to noncontrolling interests (23,273 ) (46,862 ) (30,535 ) Net income attributable to preferred stockholders (11,794 ) (7,947 ) (2,804 ) Net income attributable to participating securities (950 ) (1,082 ) (813 ) Net income attributable to Aimco common stockholders $ 235,966 $ 300,220 $ 203,673 Denominator: Weighted average common shares outstanding – basic 155,177 145,639 145,291 Dilutive potential common shares 393 363 241 Weighted average common shares outstanding – diluted 155,570 146,002 145,532 Earnings per common share – basic and diluted: Income from continuing operations attributable to Aimco common stockholders $ 1.52 $ 2.06 $ 0.29 Income from discontinued operations attributable to Aimco common stockholders — — 1.11 Net income attributable to Aimco common stockholders $ 1.52 $ 2.06 $ 1.40 Dividends declared per common share $ 1.18 $ 1.04 $ 0.96 The Aimco Operating Partnership The following table illustrates the Aimco Operating Partnership’s calculation of basic and diluted earnings per common unit for the years ended December 31, 2015 , 2014 and 2013 (in thousands, except per unit data): 2015 2014 2013 Numerator: Income from continuing operations $ 91,390 $ 67,475 $ 34,596 Gain on dispositions of real estate, net of tax 180,593 288,636 — (Income) loss from continuing operations and gain on dispositions attributable to noncontrolling interests (4,776 ) (24,595 ) 19,369 Income attributable to the Aimco Operating Partnership’s preferred unitholders (18,737 ) (14,444 ) (9,227 ) Income attributable to participating securities (950 ) (1,082 ) (813 ) Income from continuing operations attributable to the Aimco Operating Partnership’s common unitholders $ 247,520 $ 315,990 $ 43,925 Income from discontinued operations, net of tax $ — $ — $ 203,229 Income from discontinued operations attributable to noncontrolling interests — — (31,842 ) Income from discontinued operations attributable to the Aimco Operating Partnership’s common unitholders $ — $ — $ 171,387 Net income $ 271,983 $ 356,111 $ 237,825 Net income attributable to noncontrolling interests (4,776 ) (24,595 ) (12,473 ) Net income attributable to the Aimco Operating Partnership’s preferred unitholders (18,737 ) (14,444 ) (9,227 ) Net income attributable to participating securities (950 ) (1,082 ) (813 ) Net income attributable to the Aimco Operating Partnership’s common unitholders $ 247,520 $ 315,990 $ 215,312 Denominator: Weighted average common units outstanding – basic 162,834 153,363 153,256 Dilutive potential common units 393 363 241 Weighted average common units outstanding – diluted 163,227 153,726 153,497 Earnings per common unit – basic and diluted: Income from continuing operations attributable to the Partnership’s common unitholders $ 1.52 $ 2.06 $ 0.29 Income from discontinued operations attributable to the Partnership’s common unitholders — — 1.11 Net income attributable to the Partnership’s common unitholders $ 1.52 $ 2.06 $ 1.40 Distributions declared per common unit $ 1.18 $ 1.04 $ 0.96 Aimco and the Aimco Operating Partnership As of December 31, 2015 , the common share or unit equivalents that could potentially dilute basic earnings per share or unit in future periods totaled 1.4 million . These securities represent 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. The effect of these securities was dilutive for the years ended December 31, 2015 , 2014 and 2013 , and accordingly has been included in the denominator for calculating diluted earnings per share and unit during these periods. Participating securities, consisting primarily of unvested time-based awards of restricted shares of Common Stock, receive dividends similar to shares of Common Stock and common partnership units and totaled 0.3 million , 0.5 million and 0.6 million at December 31, 2015 , 2014 and 2013 , respectively. The effect of participating securities is included in basic and diluted earnings (loss) per share and unit computations for the periods presented above using the two-class method of allocating distributed and undistributed earnings. As discussed in Note 10 , 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, 2015 , these preferred OP Units were potentially redeemable for approximately 2.2 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.

Unaudited Summarized Consolidat

Unaudited Summarized Consolidated Quarterly Information	12 Months Ended
	Dec. 31, 2015
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, 2015 and 2014 , is provided below (in thousands, except per share amounts). Quarter 2015 First Second Third Fourth Total revenues $ 244,265 $ 244,783 $ 246,387 $ 245,875 Total operating expenses (183,198 ) (179,140 ) (182,366 ) (180,391 ) Operating income 61,067 65,643 64,021 65,484 Income from continuing operations 18,457 23,907 23,769 25,257 Gain on dispositions of real estate, net of tax 85,693 44,781 — 50,119 Net income 104,150 68,688 23,769 75,376 Net income attributable to Aimco common stockholders $ 89,344 $ 60,804 $ 19,179 $ 66,639 Earnings per common share - basic: Income from continuing operations attributable to Aimco common stockholders $ 0.58 $ 0.39 $ 0.12 $ 0.43 Net income attributable to Aimco common stockholders $ 0.58 $ 0.39 $ 0.12 $ 0.43 Earnings per common share - diluted: Income from continuing operations attributable to Aimco common stockholders $ 0.58 $ 0.39 $ 0.12 $ 0.43 Net income attributable to Aimco common stockholders $ 0.58 $ 0.39 $ 0.12 $ 0.43 Weighted average common shares outstanding - basic 153,821 155,524 155,639 155,725 Weighted average common shares outstanding - diluted 154,277 155,954 156,008 156,043 Quarter 2014 First Second Third Fourth Total revenues $ 248,924 $ 246,418 $ 246,843 $ 242,178 Total operating expenses (183,646 ) (180,621 ) (179,376 ) (178,370 ) Operating income 65,278 65,797 67,467 63,808 Income from continuing operations 12,040 17,943 18,186 19,306 Gain on dispositions of real estate, net of tax 69,492 66,662 126,329 26,153 Net income 81,532 84,605 144,515 45,459 Net income attributable to Aimco common stockholders $ 64,235 $ 75,010 $ 124,706 $ 36,269 Earnings per common share - basic: Income from continuing operations attributable to Aimco common stockholders $ 0.44 $ 0.51 $ 0.86 $ 0.25 Net income attributable to Aimco common stockholders $ 0.44 $ 0.51 $ 0.86 $ 0.25 Earnings per common share - diluted: Income from continuing operations attributable to Aimco common stockholders $ 0.44 $ 0.51 $ 0.85 $ 0.25 Net income attributable to Aimco common stockholders $ 0.44 $ 0.51 $ 0.85 $ 0.25 Weighted average common shares outstanding - basic 145,473 145,657 145,672 145,753 Weighted average common shares outstanding - diluted 145,681 145,985 146,104 146,238 The Aimco Operating Partnership The Aimco Operating Partnership’s summarized unaudited consolidated quarterly information for the years ended December 31, 2015 and 2014 , is provided below (in thousands, except per unit amounts). Quarter 2015 First Second Third Fourth Total revenues $ 244,265 $ 244,783 $ 246,387 $ 245,875 Total operating expenses (183,198 ) (179,140 ) (182,366 ) (180,391 ) Operating income 61,067 65,643 64,021 65,484 Income from continuing operations 18,457 23,907 23,769 25,257 Gain on dispositions of real estate, net of tax 85,693 44,781 — 50,119 Net income 104,150 68,688 23,769 75,376 Net income attributable to the Partnership’s common unitholders $ 93,742 $ 63,776 $ 20,072 $ 69,930 Earnings per common unit - basic: Income from continuing operations attributable to the Partnership’s common unitholders $ 0.58 $ 0.39 $ 0.12 $ 0.43 Net income attributable to the Partnership’s common unitholders $ 0.58 $ 0.39 $ 0.12 $ 0.43 Earnings per common unit - diluted: Income from continuing operations attributable to the Partnership’s common unitholders $ 0.58 $ 0.39 $ 0.12 $ 0.43 Net income attributable to the Partnership’s common unitholders $ 0.58 $ 0.39 $ 0.12 $ 0.43 Weighted average common units outstanding - basic 161,461 163,149 163,241 163,485 Weighted average common units outstanding - diluted 161,917 163,579 163,610 163,803 Quarter 2014 First Second Third Fourth Total revenues $ 248,924 $ 246,418 $ 246,843 $ 242,178 Total operating expenses (183,646 ) (180,621 ) (179,376 ) (178,370 ) Operating income 65,278 65,797 67,467 63,808 Income from continuing operations 12,040 17,943 18,186 19,306 Gain on dispositions of real estate, net of tax 69,492 66,662 126,329 26,153 Net income 81,532 84,605 144,515 45,459 Net income attributable to the Partnership’s common unitholders $ 67,846 $ 78,745 $ 131,255 $ 38,144 Earnings per common unit - basic: Income from continuing operations attributable to the Partnership’s common unitholders $ 0.44 $ 0.51 $ 0.86 $ 0.25 Net income attributable to the Partnership’s common unitholders $ 0.44 $ 0.51 $ 0.86 $ 0.25 Earnings per common unit - diluted: Income from continuing operations attributable to the Partnership’s common unitholders $ 0.44 $ 0.51 $ 0.85 $ 0.25 Net income attributable to the Partnership’s common unitholders $ 0.44 $ 0.51 $ 0.85 $ 0.25 Weighted average common units outstanding - basic 153,329 153,377 153,337 153,408 Weighted average common units outstanding - diluted 153,537 153,705 153,769 153,893

Business Segments

Business Segments	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Business Segments	Business Segments We have two reportable segments: conventional real estate operations and affordable real estate operations. Our conventional real estate reportable segment included 140 apartment communities with 40,464 apartment homes at December 31, 2015 . Our affordable real estate operations consisted of 56 apartment communities with 8,685 apartment homes at December 31, 2015 , with rents that are generally paid, in whole or part, by a government agency. Due to the diversity of our economic ownership interests in our apartment communities, our chief executive officer, who is 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 the consolidated and unconsolidated apartment communities that we own and manage. The following tables present the revenues, net operating income (loss) and income (loss) from continuing operations of our conventional and affordable real estate operations segments on a proportionate basis (excluding amounts related to apartment communities sold or classified as held for sale, as of December 31, 2015) for the years ended December 31, 2015 , 2014 and 2013 (in thousands): Conventional Real Estate Operations Affordable Real Estate Operations Proportionate Adjustments (1) Corporate and Amounts Not Allocated to Segments (2) Consolidated Year Ended December 31, 2015: Rental and other property revenues (3) $ 798,321 $ 96,549 $ 37,369 $ 24,715 $ 956,954 Tax credit and asset management revenues — — — 24,356 24,356 Total revenues 798,321 96,549 37,369 49,071 981,310 Property operating expenses (3) 263,573 38,484 13,815 43,521 359,393 Investment management expenses — — — 5,855 5,855 Depreciation and amortization (3) — — — 306,301 306,301 General and administrative expenses — — — 43,178 43,178 Other expenses, net — — — 10,368 10,368 Total operating expenses 263,573 38,484 13,815 409,223 725,095 Operating income (loss) 534,748 58,065 23,554 (360,152 ) 256,215 Other items included in continuing operations — — — (164,825 ) (164,825 ) Income (loss) from continuing operations $ 534,748 $ 58,065 $ 23,554 $ (524,977 ) $ 91,390 Conventional Real Estate Operations Affordable Real Estate Operations Proportionate Adjustments (1) Corporate and Amounts Not Allocated to Segments (2) Consolidated Year Ended December 31, 2014: Rental and other property revenues (3) $ 729,657 $ 94,501 $ 29,564 $ 99,109 $ 952,831 Tax credit and asset management revenues — — — 31,532 31,532 Total revenues 729,657 94,501 29,564 130,641 984,363 Property operating expenses (3) 245,264 38,407 8,878 81,105 373,654 Investment management expenses — — — 7,310 7,310 Depreciation and amortization (3) — — — 282,608 282,608 Provision for real estate impairment losses (3) — — — 1,820 1,820 General and administrative expenses — — — 44,092 44,092 Other expenses, net — — — 12,529 12,529 Total operating expenses 245,264 38,407 8,878 429,464 722,013 Operating income (loss) 484,393 56,094 20,686 (298,823 ) 262,350 Other items included in continuing operations — — — (194,875 ) (194,875 ) Income (loss) from continuing operations $ 484,393 $ 56,094 $ 20,686 $ (493,698 ) $ 67,475 Conventional Real Estate Operations Affordable Real Estate Operations Proportionate Adjustments (1) Corporate and Amounts Not Allocated to Segments (2) Consolidated Year Ended December 31, 2013: Rental and other property revenues (3) $ 679,422 $ 93,033 $ 66,489 $ 100,287 $ 939,231 Tax credit and asset management revenues — — — 34,822 34,822 Total revenues 679,422 93,033 66,489 135,109 974,053 Property operating expenses (3) 233,183 37,433 25,192 79,902 375,710 Investment management expenses — — — 4,341 4,341 Depreciation and amortization (3) — — — 291,910 291,910 General and administrative expenses — — — 45,670 45,670 Other expenses, net — — — 7,403 7,403 Total operating expenses 233,183 37,433 25,192 429,226 725,034 Operating income (loss) 446,239 55,600 41,297 (294,117 ) 249,019 Other items included in continuing operations — — — (214,423 ) (214,423 ) Income (loss) from continuing operations $ 446,239 $ 55,600 $ 41,297 $ (508,540 ) $ 34,596 (1) Represents adjustments for the noncontrolling interests in consolidated real estate partnerships’ share of the results of our consolidated apartment communities and the results of consolidated apartment communities that we do not manage, which are excluded from our measurement of segment performance but included in the related consolidated amounts, and our share of the results of operations of our unconsolidated real estate partnerships that we manage, which are included in our measurement of segment performance but excluded from the related consolidated amounts. (2) Our basis for assessing segment performance excludes the results of apartment communities sold or classified as held for sale. As discussed in Note 2 , effective January 1, 2014, we adopted ASU 2014-08, which revised the definition of a discontinued operation. In the segment presentation above, the current year and prior years' operating results for apartment communities sold or classified as held for sale during the years ended December 31, 2015 and 2014 , are presented within the Corporate and Amounts Not Allocated to Segments column. The operating results for the year ended December 31, 2013 , for apartment communities sold through December 31, 2013, are presented within discontinued operations and are accordingly excluded from the segment presentation above. (3) Proportionate property net operating income, our key measurement of segment profit or loss excludes property management revenues (which are included in rental and other property revenues), property management expenses and casualty gains and losses (which are included in property operating expenses), depreciation and amortization and provision for real estate impairment losses. Accordingly, we do not allocate these amounts to our segments. The assets of our reportable segments on a proportionate basis, together with the proportionate adjustments to reconcile these amounts to the consolidated assets of our segments, and the consolidated assets not allocated to our segments are as follows (in thousands): December 31, 2015 2014 Conventional $ 5,107,059 $ 4,841,402 Affordable 421,932 439,488 Proportionate adjustments (1) 175,042 179,323 Corporate and other assets (2) 440,161 636,815 Total consolidated assets $ 6,144,194 $ 6,097,028 (1) Represents adjustments for the noncontrolling interests in consolidated real estate partnerships’ share of the assets of our consolidated apartment communities, which are excluded from our measurement of segment financial condition, and our share of the assets of our unconsolidated real estate partnerships, which are included in our measure of segment financial condition. (2) Our basis for assessing segment performance excludes the results of apartment communities sold or classified as held for sale, therefore, assets related to apartment communities sold or classified as held for sale during the periods are included within Corporate and other assets for comparative periods presented. For the years ended December 31, 2015 , 2014 and 2013 , capital additions related to our conventional segment totaled $350.1 million , $355.4 million and $365.3 million , respectively, and capital additions related to our affordable segment totaled $12.9 million , $12.1 million and $10.7 million , respectively.

Real Estate and Accumulated Dep

Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2015
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, 2015 (In Thousands Except Apartment Home Data) (2) (3) (1) Initial Cost Cost Capitalized December 31, 2015 Apartment Date Year Apartment Buildings and Subsequent to Buildings and (4) Accumulated Total Cost Apartment Community Name Type Consolidated Location Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances Conventional Apartment Communities: 100 Forest Place High Rise Dec 1997 Oak Park, IL 1987 234 $ 2,664 $ 18,815 $ 7,674 $ 2,664 $ 26,489 $ 29,153 $ (12,726 ) $ 16,427 $ — 118-122 West 23rd Street High Rise Jun 2012 New York, NY 1987 42 14,985 23,459 6,171 14,985 29,630 44,615 (4,265 ) 40,350 18,726 1582 First Avenue High Rise Mar 2005 New York, NY 1900 17 4,281 752 363 4,281 1,115 5,396 (440 ) 4,956 2,419 173 E. 90th Street High Rise May 2004 New York, NY 1910 72 12,066 4,535 3,008 12,066 7,543 19,609 (2,749 ) 16,860 7,120 182-188 Columbus Avenue Mid Rise Feb 2007 New York, NY 1910 32 19,123 3,300 3,789 19,123 7,089 26,212 (2,618 ) 23,594 13,471 21 Fitzsimons Mid-Rise Aug 2014 Aurora, CO 2008 600 12,864 104,720 1,583 12,864 106,303 119,167 (5,055 ) 114,112 48,995 234 East 88th Street Mid-Rise Jan 2014 New York, NY 1900 20 2,448 4,449 482 2,448 4,931 7,379 (351 ) 7,028 3,433 236-238 East 88th Street High Rise Jan 2004 New York, NY 1900 43 8,820 2,914 1,789 8,820 4,703 13,523 (1,605 ) 11,918 11,587 237-239 Ninth Avenue High Rise Mar 2005 New York, NY 1900 36 8,495 1,866 2,820 8,495 4,686 13,181 (1,578 ) 11,603 5,909 240 West 73rd Street, LLC High Rise Sep 2004 New York, NY 1900 200 68,109 12,140 9,914 68,109 22,054 90,163 (7,797 ) 82,366 — 2900 on First Apartments Mid Rise Oct 2008 Seattle, WA 1989 135 19,070 17,518 32,320 19,070 49,838 68,908 (11,931 ) 56,977 — 306 East 89th Street High Rise Jul 2004 New York, NY 1930 20 2,680 1,006 525 2,680 1,531 4,211 (522 ) 3,689 1,973 311 & 313 East 73rd Street Mid Rise Mar 2003 New York, NY 1904 34 5,678 1,609 503 5,678 2,112 7,790 (1,293 ) 6,497 4,159 322-324 East 61st Street High Rise Mar 2005 New York, NY 1900 40 6,372 2,224 1,175 6,372 3,399 9,771 (1,456 ) 8,315 3,628 3400 Avenue of the Arts Mid Rise Mar 2002 Costa Mesa, CA 1987 770 57,241 65,506 73,411 57,241 138,917 196,158 (77,731 ) 118,427 108,983 452 East 78th Street High Rise Jan 2004 New York, NY 1900 12 1,982 608 397 1,982 1,005 2,987 (381 ) 2,606 2,708 464-466 Amsterdam & 200-210 W. 83rd Street Mid Rise Feb 2007 New York, NY 1910 71 25,553 7,101 5,268 25,553 12,369 37,922 (4,936 ) 32,986 19,679 510 East 88th Street High Rise Jan 2004 New York, NY 1900 20 3,163 1,002 399 3,163 1,401 4,564 (450 ) 4,114 2,902 514-516 East 88th Street High Rise Mar 2005 New York, NY 1900 36 6,282 2,168 842 6,282 3,010 9,292 (1,213 ) 8,079 3,933 518 East 88th Street Mid-Rise Jan 2014 New York, NY 1900 20 2,233 4,315 469 2,233 4,784 7,017 (365 ) 6,652 2,974 707 Leahy Garden Apr 2007 Redwood City, CA 1973 110 15,444 7,909 5,527 15,444 13,436 28,880 (6,065 ) 22,815 9,284 865 Bellevue Garden Jul 2000 Nashville, TN 1972 326 3,562 12,037 28,446 3,562 40,483 44,045 (25,489 ) 18,556 17,533 1045 on the Park Apartments Homes Mid Rise Jul 2013 Atlanta, GA 2012 30 2,793 6,662 139 2,793 6,801 9,594 (592 ) 9,002 5,981 Axiom Apartment Homes Mid Rise Apr 2015 Cambridge, MA 2015 115 — 63,612 165 — 63,777 63,777 (1,580 ) 62,197 35,000 Bank Lofts High Rise Apr 2001 Denver, CO 1920 125 3,525 9,045 3,632 3,525 12,677 16,202 (6,053 ) 10,149 11,181 Bay Parc Plaza High Rise Sep 2004 Miami, FL 2000 471 22,680 41,847 9,486 22,680 51,333 74,013 (14,939 ) 59,074 44,194 Bay Ridge at Nashua Garden Jan 2003 Nashua, NH 1984 412 3,262 40,713 5,300 3,262 46,013 49,275 (18,304 ) 30,971 29,820 Bayberry Hill Estates Garden Aug 2002 Framingham, MA 1971 424 19,944 35,945 12,765 19,944 48,710 68,654 (22,056 ) 46,598 32,051 Bluffs at Pacifica, The Garden Oct 2006 Pacifica, CA 1963 64 8,108 4,132 14,672 8,108 18,804 26,912 (9,922 ) 16,990 5,694 Boston Lofts High Rise Apr 2001 Denver, CO 1890 158 3,446 20,589 5,634 3,446 26,223 29,669 (12,820 ) 16,849 16,333 Boulder Creek Garden Jul 1994 Boulder, CO 1973 221 754 7,730 20,205 754 27,935 28,689 (16,502 ) 12,187 6,708 Broadcast Center Garden Mar 2002 Los Angeles, CA 1990 279 29,407 41,244 27,070 29,407 68,314 97,721 (34,668 ) 63,053 — Broadway Lofts High Rise Sep 2012 San Diego, CA 1909 84 5,367 14,442 1,297 5,367 15,739 21,106 (1,862 ) 19,244 9,448 Burke Shire Commons Garden Mar 2001 Burke, VA 1986 360 4,867 23,617 13,699 4,867 37,316 42,183 (17,380 ) 24,803 40,536 Calhoun Beach Club High Rise Dec 1998 Minneapolis, MN 1928 332 11,708 73,334 54,533 11,708 127,867 139,575 (67,386 ) 72,189 45,050 Canyon Terrace Garden Mar 2002 Saugus, CA 1984 130 7,508 6,601 6,024 7,508 12,625 20,133 (7,170 ) 12,963 9,708 Cedar Rim Garden Apr 2000 Newcastle, WA 1980 104 761 5,218 16,939 761 22,157 22,918 (18,439 ) 4,479 7,246 Charlesbank Apartment Homes Mid Rise Sep 2013 Watertown, MA 2012 44 3,399 11,726 281 3,399 12,007 15,406 (966 ) 14,440 8,214 Chestnut Hall High Rise Oct 2006 Philadelphia, PA 1923 315 12,338 14,299 10,196 12,338 24,495 36,833 (13,517 ) 23,316 38,940 Chestnut Hill Village Garden Apr 2000 Philadelphia, PA 1963 821 6,469 49,316 43,542 6,469 92,858 99,327 (57,694 ) 41,633 54,374 Chimneys of Cradle Rock Garden Jun 2004 Columbia, MD 1979 198 2,040 8,108 536 2,040 8,644 10,684 (2,889 ) 7,795 15,619 (2) (3) (1) Initial Cost Cost Capitalized December 31, 2015 Apartment Date Year Apartment Buildings and Subsequent to Buildings and (4) Accumulated Total Cost Apartment Community Name Type Consolidated Location Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances Columbus Avenue Mid Rise Sep 2003 New York, NY 1880 59 35,527 9,450 5,137 35,527 14,587 50,114 (8,251 ) 41,863 26,853 Creekside Garden Jan 2000 Denver, CO 1974 328 3,189 12,698 5,882 3,189 18,580 21,769 (11,630 ) 10,139 12,021 Crescent at West Hollywood, The Mid Rise Mar 2002 West Hollywood, CA 1985 130 15,765 10,215 14,535 15,765 24,750 40,515 (17,836 ) 22,679 — Eastpointe Garden Dec 2014 Boulder, CO 1970 140 15,300 2,705 53 15,300 2,758 18,058 (98 ) 17,960 — Elm Creek Mid Rise Dec 1997 Elmhurst, IL 1987 400 5,910 30,830 29,904 5,910 60,734 66,644 (26,752 ) 39,892 39,940 Evanston Place High Rise Dec 1997 Evanston, IL 1990 190 3,232 25,546 11,823 3,232 37,369 40,601 (16,285 ) 24,316 20,005 Farmingdale Mid Rise Oct 2000 Darien, IL 1975 240 11,763 15,174 9,766 11,763 24,940 36,703 (11,975 ) 24,728 14,979 Flamingo Towers High Rise Sep 1997 Miami Beach, FL 1960 1,227 32,430 48,808 267,185 32,434 315,989 348,423 (137,704 ) 210,719 109,398 Four Quarters Habitat Garden Jan 2006 Miami, FL 1976 336 2,379 17,199 20,843 2,379 38,042 40,421 (21,879 ) 18,542 6,781 Foxchase Garden Dec 1997 Alexandria, VA 1940 2,113 15,496 96,062 38,356 15,496 134,418 149,914 (73,312 ) 76,602 237,881 Georgetown Garden Aug 2002 Framingham, MA 1964 207 12,351 13,168 2,700 12,351 15,868 28,219 (6,769 ) 21,450 7,863 Georgetown II Mid Rise Aug 2002 Framingham, MA 1958 72 4,577 4,057 1,252 4,577 5,309 9,886 (2,595 ) 7,291 2,634 Grand Pointe Garden Dec 1999 Columbia, MD 1972 325 2,714 16,771 5,977 2,714 22,748 25,462 (11,931 ) 13,531 — Heritage Park Escondido Garden Oct 2000 Escondido, CA 1986 196 1,055 7,565 1,659 1,055 9,224 10,279 (6,112 ) 4,167 6,831 Heritage Park Livermore Garden Oct 2000 Livermore, CA 1988 167 — 10,209 1,625 — 11,834 11,834 (7,036 ) 4,798 7,060 Heritage Village Anaheim Garden Oct 2000 Anaheim, CA 1986 196 1,832 8,541 1,455 1,832 9,996 11,828 (6,295 ) 5,533 8,291 Hidden Cove Garden Jul 1998 Escondido, CA 1983 334 3,043 17,616 10,350 3,043 27,966 31,009 (14,817 ) 16,192 35,320 Hidden Cove II Garden Jul 2007 Escondido, CA 1986 118 12,849 6,530 7,063 12,849 13,593 26,442 (7,274 ) 19,168 14,310 Hillcreste Garden Mar 2002 Century City, CA 1989 315 35,862 47,216 18,465 35,862 65,681 101,543 (31,011 ) 70,532 67,724 Hillmeade Garden Nov 1994 Nashville, TN 1986 288 2,872 16,070 12,287 2,872 28,357 31,229 (16,545 ) 14,684 16,307 Horizons West Apartments Mid Rise Dec 2006 Pacifica, CA 1970 78 8,887 6,377 2,373 8,887 8,750 17,637 (3,752 ) 13,885 — Hunt Club Garden Sep 2000 Gaithersburg, MD 1986 336 17,859 13,149 9,320 17,859 22,469 40,328 (11,993 ) 28,335 — Hunter's Chase Garden Jan 2001 Midlothian, VA 1985 320 7,935 7,915 3,156 7,935 11,071 19,006 (5,032 ) 13,974 14,704 Hunters Glen Garden Oct 1999 Plainsboro, NJ 1976 896 8,778 47,259 39,501 8,778 86,760 95,538 (63,424 ) 32,114 62,228 Hyde Park Tower High Rise Oct 2004 Chicago, IL 1990 155 4,731 14,927 5,076 4,731 20,003 24,734 (5,429 ) 19,305 13,499 Indian Oaks Garden Mar 2002 Simi Valley, CA 1986 254 24,523 15,801 5,323 24,523 21,124 45,647 (10,467 ) 35,180 — Island Club Garden Oct 2000 Oceanside, CA 1986 592 18,027 28,654 16,400 18,027 45,054 63,081 (27,267 ) 35,814 58,917 Key Towers High Rise Apr 2001 Alexandria, VA 1964 140 1,526 7,050 6,794 1,526 13,844 15,370 (9,988 ) 5,382 9,939 Lakeside Garden Oct 1999 Lisle, IL 1972 568 5,840 27,937 32,367 5,840 60,304 66,144 (40,623 ) 25,521 26,830 Lakeside at Vinings Mountain Garden Jan 2000 Atlanta, GA 1983 220 2,111 11,862 15,536 2,111 27,398 29,509 (19,806 ) 9,703 13,985 Latrobe High Rise Jan 2003 Washington, DC 1980 175 3,459 9,103 16,471 3,459 25,574 29,033 (17,915 ) 11,118 28,460 Lincoln Place (5) Garden Oct 2004 Venice, CA 1951 795 128,332 10,439 331,935 44,197 342,374 386,571 (41,609 ) 344,962 197,449 Lodge at Chattahoochee, The Garden Oct 1999 Sandy Springs, GA 1970 312 2,335 16,370 20,826 2,335 37,196 39,531 (24,539 ) 14,992 20,530 Malibu Canyon Garden Mar 2002 Calabasas, CA 1986 698 69,834 53,438 21,973 69,834 75,411 145,245 (36,536 ) 108,709 111,854 Maple Bay Garden Dec 1999 Virginia Beach, VA 1971 414 2,597 16,141 28,071 2,597 44,212 46,809 (30,732 ) 16,077 — Mariner's Garden Mar 2002 San Diego, CA 1984 500 — 66,861 7,956 — 74,817 74,817 (32,476 ) 42,341 — Meadow Creek Garden Jul 1994 Boulder, CO 1968 332 1,435 24,533 4,863 1,435 29,396 30,831 (15,893 ) 14,938 — Merrill House High Rise Jan 2000 Falls Church, VA 1964 159 1,836 10,831 7,558 1,836 18,389 20,225 (9,281 ) 10,944 17,911 Mezzo High Rise Mar 2015 Atlanta, GA 2008 94 4,292 34,178 9 4,292 34,187 38,479 (1,153 ) 37,326 24,962 Monterey Grove Garden Jun 2008 San Jose, CA 1999 224 34,325 21,939 4,178 34,325 26,117 60,442 (9,158 ) 51,284 — Ocean House on Prospect Mid Rise Apr 2013 La Jolla, CA 1970 53 12,528 18,805 14,615 12,528 33,420 45,948 (684 ) 45,264 13,906 One Canal High Rise Sep 2013 Boston, MA In process 310 — 15,873 146,811 — 162,684 162,684 (1 ) 162,683 86,151 Pacific Bay Vistas (5) Garden Mar 2001 San Bruno, CA 1987 308 28,694 62,460 36,590 23,354 99,050 122,404 (14,841 ) 107,563 70,356 Pacifica Park Garden Jul 2006 Pacifica, CA 1977 104 12,970 6,579 4,465 12,970 11,044 24,014 (5,001 ) 19,013 11,687 Palazzo at Park La Brea, The Mid Rise Feb 2004 Los Angeles, CA 2002 521 48,362 125,464 30,633 48,362 156,097 204,459 (65,684 ) 138,775 170,000 Palazzo East at Park La Brea, The Mid Rise Mar 2005 Los Angeles, CA 2005 611 72,578 136,503 18,586 72,578 155,089 227,667 (61,475 ) 166,192 117,447 Park Towne Place High Rise Apr 2000 Philadelphia, PA 1959 948 10,472 47,301 213,782 10,472 261,083 271,555 (59,556 ) 211,999 — Parkway Garden Mar 2000 Willamsburg, VA 1971 148 386 2,834 2,757 386 5,591 5,977 (3,450 ) 2,527 — (2) (3) (1) Initial Cost Cost Capitalized December 31, 2015 Apartment Date Year Apartment Buildings and Subsequent to Buildings and (4) Accumulated Total Cost 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 10,266 19,595 25,104 44,699 (11,145 ) 33,554 39,604 Peachtree Park Garden Jan 1996 Atlanta, GA 1969 303 4,684 11,713 12,506 4,684 24,219 28,903 (13,562 ) 15,341 7,301 Peak at Vinings Mountain, The Garden Jan 2000 Atlanta, GA 1980 280 2,651 13,660 18,395 2,651 32,055 34,706 (23,516 ) 11,190 14,776 Plantation Gardens Garden Oct 1999 Plantation ,FL 1971 372 3,773 19,443 19,344 3,773 38,787 42,560 (21,336 ) 21,224 21,737 Post Ridge Garden Jul 2000 Nashville, TN 1972 150 1,883 6,712 4,557 1,883 11,269 13,152 (7,181 ) 5,971 5,465 Preserve at Marin Mid Rise Aug 2011 Corte Madera, CA 1964 126 18,179 30,132 81,024 18,179 111,156 129,335 (7,458 ) 121,877 38,478 Ravensworth Towers High Rise Jun 2004 Annandale, VA 1974 219 3,455 17,157 3,055 3,455 20,212 23,667 (12,328 ) 11,339 21,613 Reflections Garden Sep 2000 Virginia Beach, VA 1987 480 15,988 13,684 4,840 15,988 18,524 34,512 (9,758 ) 24,754 29,352 River Club,The Garden Apr 2005 Edgewater, NJ 1998 266 30,579 30,638 3,783 30,579 34,421 65,000 (12,764 ) 52,236 — Riverloft High Rise Oct 1999 Philadelphia, PA 1910 184 2,120 11,286 29,301 2,120 40,587 42,707 (18,171 ) 24,536 12,495 Riverside High Rise Apr 2000 Alexandria ,VA 1973 1,222 10,854 65,473 91,415 10,854 156,888 167,742 (110,957 ) 56,785 114,639 Rosewood Garden Mar 2002 Camarillo, CA 1976 152 12,430 8,060 3,600 12,430 11,660 24,090 (5,475 ) 18,615 16,697 Royal Crest Estates Garden Aug 2002 Warwick, RI 1972 492 22,433 24,095 4,365 22,433 28,460 50,893 (17,152 ) 33,741 34,670 Royal Crest Estates Garden Aug 2002 Nashua, NH 1970 902 68,230 45,562 11,025 68,230 56,587 124,817 (36,300 ) 88,517 32,759 Royal Crest Estates Garden Aug 2002 Marlborough, MA 1970 473 25,178 28,786 8,731 25,178 37,517 62,695 (20,443 ) 42,252 32,188 Royal Crest Estates Garden Aug 2002 North Andover, MA 1970 588 51,292 36,808 21,462 51,292 58,270 109,562 (27,517 ) 82,045 — Savannah Trace Garden Mar 2001 Shaumburg, IL 1986 368 13,960 20,731 5,185 13,960 25,916 39,876 (13,367 ) 26,509 24,142 Saybrook Point Garden Dec 2014 San Jose, CA 1995 324 32,842 84,457 625 32,842 85,082 117,924 (2,957 ) 114,967 64,861 Scotchollow Garden Jan 2006 San Mateo, CA 1971 418 49,475 17,756 12,635 49,475 30,391 79,866 (14,101 ) 65,765 75,749 Shenandoah Crossing Garden Sep 2000 Fairfax, VA 1984 640 18,200 57,198 19,746 18,200 76,944 95,144 (43,570 ) 51,574 61,964 Springwoods at Lake Ridge Garden Jul 2002 Woodbridge, VA 1984 180 5,587 7,284 2,857 5,587 10,141 15,728 (3,214 ) 12,514 — Steeplechase Garden Sep 2000 Largo, MD 1986 240 3,675 16,111 4,464 3,675 20,575 24,250 (11,298 ) 12,952 — Sterling Apartment Homes, The Garden Oct 1999 Philadelphia, PA 1961 535 8,871 55,365 75,489 8,871 130,854 139,725 (49,401 ) 90,324 69,983 Stone Creek Club Garden Sep 2000 Germantown, MD 1984 240 13,593 9,347 6,895 13,593 16,242 29,835 (10,321 ) 19,514 — Timbers at Long Reach Apartment Homes Garden Apr 2005 Columbia, MD 1979 178 2,430 12,181 496 2,430 12,677 15,107 (6,704 ) 8,403 12,896 Towers Of Westchester Park, The High Rise Jan 2006 College Park, MD 1972 303 15,198 22,029 11,982 15,198 34,011 49,209 (13,952 ) 35,257 24,952 Township At Highlands Town Home Nov 1996 Centennial, CO 1985 161 1,536 9,773 6,618 1,536 16,391 17,927 (10,131 ) 7,796 14,738 Tremont Mid Rise Dec 2014 Atlanta, GA 2009 78 5,274 18,550 530 5,274 19,080 24,354 (663 ) 23,691 — Twin Lake Towers High Rise Oct 1999 Westmont, IL 1969 399 3,268 18,763 37,876 3,268 56,639 59,907 (41,472 ) 18,435 31,110 Vantage Pointe Mid Rise Aug 2002 Swampscott, MA 1987 96 4,748 10,089 1,652 4,748 11,741 16,489 (4,312 ) 12,177 4,561 Views at Vinings Mountain, The Garden Jan 2006 Atlanta, GA 1983 180 610 5,026 12,011 610 17,037 17,647 (15,466 ) 2,181 — Villa Del Sol Garden Mar 2002 Norwalk, CA 1972 120 7,476 4,861 2,284 7,476 7,145 14,621 (4,044 ) 10,577 11,237 Village of Pennbrook Garden Oct 1998 Levittown, PA 1969 722 10,240 38,222 11,293 10,240 49,515 59,755 (29,580 ) 30,175 44,021 Villas at Park La Brea, The Garden Mar 2002 Los Angeles, CA 2002 250 8,630 48,871 6,950 8,630 55,821 64,451 (25,367 ) 39,084 19,248 Villas of Pasadena Mid Rise Jan 2006 Pasadena, CA 1973 92 9,693 6,818 1,978 9,693 8,796 18,489 (3,329 ) 15,160 9,689 Vivo High Rise Jun 2015 Cambridge, MA 2015 91 6,450 35,974 1,332 6,450 37,306 43,756 (480 ) 43,276 — Waterford Village Garden Aug 2002 Bridgewater, MA 1971 588 29,110 28,101 3,161 29,110 31,262 60,372 (22,639 ) 37,733 37,394 Waterways Village Garden Jun 1997 Aventura, FL 1994 180 4,504 11,064 6,180 4,504 17,244 21,748 (9,092 ) 12,656 — Waverly Apartments Garden Aug 2008 Brighton, MA 1970 103 7,920 11,347 2,289 7,920 13,636 21,556 (4,422 ) 17,134 12,241 Wexford Village Garden Aug 2002 Worcester, MA 1974 264 6,349 17,939 1,725 6,349 19,664 26,013 (10,694 ) 15,319 9,290 Willow Bend Garden May 1998 Rolling Meadows, IL 1969 328 2,717 15,437 26,474 2,717 41,911 44,628 (29,319 ) 15,309 18,037 Windrift Garden Mar 2001 Oceanside, CA 1987 404 24,960 17,590 19,074 24,960 36,664 61,624 (25,511 ) 36,113 41,084 Windsor Park Garden Mar 2001 Woodbridge, VA 1987 220 4,279 15,970 5,503 4,279 21,473 25,752 (10,732 ) 15,020 17,992 Woods Of Williamsburg Garden Jan 2006 Williamsburg, VA 1976 125 798 3,657 1,103 798 4,760 5,558 (3,930 ) 1,628 — Yacht Club at Brickell High Rise Dec 2003 Miami, FL 1998 357 31,362 32,214 9,809 31,362 42,023 73,385 (13,309 ) 60,076 47,304 Yorktown Apartments High Rise Dec 1999 Lombard, IL 1971 364 3,055 18,162 33,837 3,055 51,999 55,054 (23,181 ) 31,873 30,328 Total Conventional Apartment Communities 40,226 1,834,423 3,104,080 2,606,954 1,744,952 5,711,030 7,455,982 (2,371,248 ) 5,084,734 3,515,121 (2) (3) (1) Initial Cost Cost Capitalized December 31, 2015 Apartment Date Year Apartment Buildings and Subsequent to Buildings and (4) Accumulated Total Cost Apartment Community Name Type Consolidated Location Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances Affordable Apartment Communities: All Hallows Garden Jan 2006 San Francisco, CA 1976 157 1,338 29,770 21,196 1,338 50,966 52,304 (29,359 ) 22,945 22,334 Arvada House High Rise Nov 2004 Arvada, CO 1977 88 405 3,314 2,289 405 5,603 6,008 (2,602 ) 3,406 3,909 Bayview Garden Jun 2005 San Francisco, CA 1976 146 582 15,265 17,888 582 33,153 33,735 (20,987 ) 12,748 11,604 Beacon Hill High Rise Mar 2002 Hillsdale, MI 1980 198 1,094 7,044 6,171 1,094 13,215 14,309 (6,359 ) 7,950 6,774 Biltmore Towers High Rise Mar 2002 Dayton, OH 1980 230 1,814 6,411 13,114 1,814 19,525 21,339 (12,498 ) 8,841 10,257 Butternut Creek Mid Rise Jan 2006 Charlotte, MI 1980 100 505 3,617 3,975 505 7,592 8,097 (5,851 ) 2,246 4,047 Carriage House Mid Rise Dec 2006 Petersburg, VA 1885 118 716 2,886 4,233 716 7,119 7,835 (3,923 ) 3,912 1,833 City Line Garden Mar 2002 Newport News, VA 1976 200 500 2,014 7,712 500 9,726 10,226 (4,582 ) 5,644 4,324 Copperwood I Apartments Garden Apr 2006 The Woodlands, TX 1980 150 383 8,373 5,901 383 8,117 8,500 (6,142 ) 2,358 5,156 Copperwood II Apartments Garden Oct 2005 The Woodlands, TX 1981 150 459 5,553 3,647 459 9,200 9,659 (5,442 ) 4,217 5,320 Country Club Heights Garden Mar 2004 Quincy, IL 1976 200 676 5,715 5,113 676 10,828 11,504 (6,097 ) 5,407 5,472 Crevenna Oaks Town Home Jan 2006 Burke, VA 1979 50 — 5,203 437 — 5,640 5,640 (3,181 ) 2,459 2,492 Fountain Place Mid Rise Jan 2006 Connersville, IN 1980 102 378 2,091 3,205 378 5,296 5,674 (2,046 ) 3,628 918 Hopkins Village Mid Rise Sep 2003 Baltimore, MD 1979 165 549 5,973 3,821 549 9,794 10,343 (4,406 ) 5,937 9,100 Ingram Square Garden Jan 2006 San Antonio, TX 1980 120 800 3,136 5,899 800 9,035 9,835 (5,559 ) 4,276 3,251 Kirkwood House High Rise Sep 2004 Baltimore, MD 1979 261 1,337 9,358 9,053 1,337 18,411 19,748 (8,568 ) 11,180 16,000 La Salle Garden Oct 2000 San Francisco, CA 1976 145 1,866 19,567 17,969 1,866 37,536 39,402 (25,603 ) 13,799 17,522 La Vista Garden Jan 2006 Concord, CA 1981 75 581 4,449 4,668 581 9,117 9,698 (3,772 ) 5,926 4,950 Loring Towers High Rise Oct 2002 Minneapolis, MN 1975 230 886 7,445 8,220 886 15,665 16,551 (7,613 ) 8,938 9,578 Loring Towers Apartments High Rise Sep 2003 Salem, MA 1973 250 187 14,050 7,940 187 21,990 22,177 (10,106 ) 12,071 9,978 New Baltimore Mid Rise Mar 2002 New Baltimore, MI 1980 101 896 2,360 5,311 896 7,671 8,567 (4,208 ) 4,359 1,982 Northpoint Garden Jan 2000 Chicago, IL 1921 304 2,510 14,334 15,511 2,510 29,845 32,355 (21,599 ) 10,756 17,580 Panorama Park Garden Mar 2002 Bakersfield, CA 1982 66 521 5,520 1,210 521 6,730 7,251 (3,547 ) 3,704 1,790 Park Place Mid Rise Jun 2005 St Louis, MO 1977 242 705 6,327 8,260 705 14,587 15,292 (10,771 ) 4,521 8,524 Parkways, The Garden Jun 2004 Chicago, IL 1925 446 3,426 23,257 20,768 3,426 44,025 47,451 (25,348 ) 22,103 16,953 Pavilion High Rise Mar 2004 Philadelphia, PA 1976 296 — 15,415 2,308 — 17,723 17,723 (9,034 ) 8,689 6,585 Pleasant Hills Garden Apr 2005 Austin, TX 1982 100 1,229 2,631 3,859 1,229 6,490 7,719 (3,763 ) 3,956 2,951 Plummer Village Mid Rise Mar 2002 North Hills, CA 1983 75 666 2,647 1,313 666 3,960 4,626 (2,634 ) 1,992 2,336 Riverwoods High Rise Jan 2006 Kankakee, IL 1983 125 598 4,931 3,628 598 8,559 9,157 (3,642 ) 5,515 3,493 Round Barn Manor Garden Mar 2002 Champaign, IL 1979 156 810 5,134 6,130 810 11,264 12,074 (4,111 ) 7,963 4,210 San Jose Apartments Garden Sep 2005 San Antonio, TX 1970 220 234 5,770 12,398 234 18,168 18,402 (9,917 ) 8,485 4,358 San Juan Del Centro Mid Rise Sep 2005 Boulder, CO 1971 150 439 7,110 13,147 439 20,257 20,696 (10,729 ) 9,967 11,707 Shoreview Garden Oct 1999 San Francisco, CA 1976 156 1,476 19,071 19,803 1,476 38,874 40,350 (27,030 ) 13,320 18,957 South Bay Villa Garden Mar 2002 Los Angeles, CA 1981 80 1,352 2,770 3,556 1,352 6,326 7,678 (5,205 ) 2,473 2,752 St. George Villas Garden Jan 2006 St. George, SC 1984 40 107 1,025 382 107 1,407 1,514 (1,140 ) 374 378 Stonegate Apts Mid Rise Jul 2009 Indianapolis, IN 1920 52 122 1,920 764 122 2,684 2,806 (1,478 ) 1,328 1,799 Summit Oaks Town Home Jan 2006 Burke, VA 1980 50 — 5,311 444 — 5,755 5,755 (3,070 ) 2,685 2,478 Tamarac Pines Apartments I Garden Nov 2004 Woodlands, TX 1980 144 363 2,775 3,366 363 6,141 6,504 (3,396 ) 3,108 3,692 Tamarac Pines Apartments II Garden Nov 2004 Woodlands, TX 1980 156 266 3,195 4,020 266 7,215 7,481 (3,918 ) 3,563 4,000 Terry Manor Mid Rise Oct 2005 Los Angeles, CA 1977 170 1,997 5,848 5,265 1,997 11,113 13,110 (8,419 ) 4,691 6,254 Tompkins Terrace Garden Oct 2002 Beacon, NY 1974 193 872 6,827 14,306 872 21,133 22,005 (10,200 ) 11,805 6,613 University Square High Rise Mar 2005 Philadelphia, PA 1978 442 702 12,201 13,014 702 25,215 25,917 (8,788 ) 17,129 — Van Nuys Apartments High Rise Mar 2002 Los Angeles, CA 1981 299 3,576 21,226 23,543 3,576 44,769 48,345 (18,832 ) 29,513 24,151 Wah Luck House High Rise Jan 2006 Washington, DC 1982 153 — 7,772 661 — 8,433 8,433 (2,922 ) 5,511 5,457 Walnut Hills High Rise Jan 2006 Cincinnati, OH 1983 198 826 5,608 5,635 820 11,249 12,069 (5,613 ) 6,456 5,117 Washington Square West Mid Rise Sep 2004 Philadelphia, PA 1982 132 582 11,169 5,273 582 16,442 17,024 (11,093 ) 5,931 3,474 Whitefield Place Garden Apr 2005 San Antonio, TX 1980 80 219 3,151 2,128 219 5,279 5,498 (2,989 ) 2,509 2,028 (2) (3) (1) Initial Cost Cost Capitalized December 31, 2015 Apartment Date Year Apartment Buildings and Subsequent to Buildings and (4) Accumulated Total Cost Apartment Community Name Type Consolidated Location Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances Winter Gardens High Rise Mar 2004 St Louis, MO 1920 112 300 3,072 4,706 300 7,778 8,078 (2,654 ) 5,424 3,336 Woodland Hills Garden Oct 2005 Jackson, MI 1980 125 320 3,875 3,950 327 7,818 8,145 (4,662 ) 3,483 3,265 Total Affordable Apartment Communities 7,998 40,170 373,486 357,110 40,171 724,438 764,609 (405,408 ) 359,201 331,039 Other (6) — 76,034 10,474 384 76,034 10,858 86,892 (1,366 ) 85,526 — Total 48,224 $ 1,950,627 $ 3,488,040 $ 2,964,448 $ 1,861,157 $ 6,446,326 $ 8,307,483 $ (2,778,022 ) $ 5,529,461 $ 3,846,160 (1) Date we acquired the apartment community or first consolidated the partnership which owns the apartment community. (2) For 2008 and prior periods, costs to acquire the noncontrolling interest’s share of our consolidated real estate partnerships were capitalized as part of the initial cost. (3) Costs capitalized subsequent to consolidation includes costs capitalized since acquisition or first consolidation of the partnership/apartment community. (4) The aggregate cost of land and depreciable property for Federal income tax purposes was approximately $3.8 billion at December 31, 2015. (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. APARTMENT INVESTMENT AND MANAGEMENT COMPANY AIMCO PROPERTIES, L.P. SCHEDULE III: REAL ESTATE AND ACCUMULATED DEPRECIATION For the Years Ended December 31, 2015 , 2014 and 2013 (In Thousands) 2015 2014 2013 Real Estate Balance at beginning of year $ 8,144,958 $ 8,214,081 $ 8,333,419 Additions during the year: Acquisitions 147,077 379,187 66,058 Capital additions 362,948 367,454 376,038 Casualty and other write-offs (1) (79,561 ) (111,068 ) (98,489 ) Amounts related to assets held for sale (7,036 ) (38,744 ) — Sales (260,903 ) (665,952 ) (462,945 ) Balance at end of year $ 8,307,483 $ 8,144,958 $ 8,214,081 Accumulated Depreciation Balance at beginning of year $ 2,672,179 $ 2,822,872 $ 2,820,765 Additions during the year: Depreciation 285,514 265,060 288,666 Deductions during the year: Casualty and other write-offs (1) (78,838 ) (106,802 ) (92,775 ) Amounts related to assets held for sale (4,427 ) (12,304 ) — Sales (96,406 ) (296,647 ) (193,784 ) Balance at end of year $ 2,778,022 $ 2,672,179 $ 2,822,872 (1) Includes the write-off of fully depreciated assets totaling $76.9 million , $106.3 million and $91.9 million , during the years ended December 31, 2015 , 2014 and 2013 , respectively.

Basis of Presentation and Sum25

Basis of Presentation and Summary of Significant Accounting Policies - (Policies)	12 Months Ended
	Dec. 31, 2015
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 entities. We consolidate all variable interest entities for which we are the primary beneficiary. 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. 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. As of December 31, 2015 , we were the primary beneficiary of, and therefore consolidated, 61 VIEs, which owned 47 apartment communities with 7,459 apartment homes. Substantially all of these VIEs are partnerships that operate qualifying affordable housing apartment communities and which are structured to provide for the pass-through of low-income housing tax credits and deductions to their partners. Real estate with a net book value of $335.1 million collateralized $325.2 million of debt of those VIEs. Any significant amounts of assets and liabilities related to our consolidated VIEs are identified parenthetically on our accompanying consolidated balance sheets. The creditors of the consolidated VIEs do not have recourse to our general credit. In addition to the VIEs discussed above, at December 31, 2015 , our consolidated financial statements included certain consolidated and unconsolidated VIEs that are part of the legacy asset management business we sold during 2012, which is discussed in Note 3 . The assets and liabilities related to these consolidated and unconsolidated VIEs are each condensed into single line items within other assets and accrued liabilities and other, respectively, in our consolidated balance sheets. Generally, we consolidate real estate partnerships and other entities that are not variable interest entities when we own, directly or indirectly, a majority voting interest in the entity or are otherwise able to control the entity. All significant intercompany balances and transactions 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 consolidated real estate partnerships owned or controlled by the Aimco Operating Partnership generally are not available to pay creditors of Aimco or 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.
Variable Interest Entities	We consolidate all variable interest entities for which we are the primary beneficiary. 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. 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. As of December 31, 2015 , we were the primary beneficiary of, and therefore consolidated, 61 VIEs, which owned 47 apartment communities with 7,459 apartment homes. Substantially all of these VIEs are partnerships that operate qualifying affordable housing apartment communities and which are structured to provide for the pass-through of low-income housing tax credits and deductions to their partners. Real estate with a net book value of $335.1 million collateralized $325.2 million of debt of those VIEs. Any significant amounts of assets and liabilities related to our consolidated VIEs are identified parenthetically on our accompanying consolidated balance sheets. The creditors of the consolidated VIEs do not have recourse to our general credit. In addition to the VIEs discussed above, at December 31, 2015 , our consolidated financial statements included certain consolidated and unconsolidated VIEs that are part of the legacy asset management business we sold during 2012, which is discussed in Note 3 . The assets and liabilities related to these consolidated and unconsolidated VIEs are each condensed into single line items within other assets and accrued liabilities and other, respectively, in our consolidated balance sheets.
Property, Plant, and Equipment	Acquisition of Real Estate Assets and Related Depreciation and Amortization We recognize the acquisition of apartment communities or interests in partnerships that own apartment communities at fair value. If the transaction results in consolidation and the apartment community is considered a business, we expense related transaction costs as incurred. If the apartment community is considered an asset (e.g. apartment communities under construction or vacant at time of acquisition), the related transaction costs are capitalized and allocated to the acquired assets. We allocate the cost of acquired apartment communities to tangible assets and identified intangible assets and liabilities based on their fair values. We determine the fair value of tangible assets, such as land, building, furniture, fixtures and equipment, generally using internal 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 internal 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 estimated 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 vacant apartment homes during the absorption period (estimates of lost rental revenue during the expected lease-up periods based on market demand and stabilized occupancy levels at the time of acquisition). Depreciation for all tangible real estate 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, 2015 , the weighted average depreciable life of our acquired buildings and improvements was approximately 30 years. Furniture, fixtures and equipment associated with acquired apartment communities are depreciated over five years. The values of the above- and below-market leases 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, 2015 and 2014 , deferred income in our consolidated balance sheets includes below-market lease amounts totaling $12.1 million and $13.8 million , respectively, which are net of accumulated amortization of $31.4 million and $29.7 million , respectively. During the years ended December 31, 2015 , 2014 and 2013 , we included amortization of below-market leases of $1.7 million , $1.3 million and $2.9 million , respectively, in rental and other property revenues in our consolidated statements of operations. In connection with apartment communities sold during the year ended December 31, 2014 , we wrote off $1.8 million of unamortized below-market lease amounts to gain on dispositions of real estate. There were no such write offs during the years ended December 31, 2015 and 2013. At December 31, 2015 , our below-market leases had a weighted average amortization period of 6.7 years and estimated aggregate amortization for each of the five succeeding years as follows (in thousands): 2016 2017 2018 2019 2020 Estimated amortization $ 1,337 $ 1,239 $ 1,095 $ 1,007 $ 915 Capital Additions and Related Depreciation We capitalize costs, including certain indirect costs, incurred in connection with our capital additions activities, including redevelopment, development and construction projects, 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 redevelopment, development and construction projects are in progress. We commence capitalization of costs, including certain indirect costs, incurred in connection with our capital addition activities, at the point in time when activities necessary to get apartment communities ready for their intended use are in progress. This includes 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 assets are substantially complete and ready for their intended use, which is typically when construction has been completed and apartment homes are available for occupancy. We charge to property operating expense, as incurred, costs including ordinary repairs, maintenance and resident turnover costs. We depreciate capitalized costs using the straight-line method over the estimated useful life of the related component or improvement, which is generally 5 , 15 or 30 years. All capitalized site payroll and indirect costs are allocated proportionately, based on direct costs, among capital projects and depreciated over the estimated useful lives of such projects. 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, 2015 , 2014 and 2013 , we capitalized to buildings and improvements $11.7 million , $14.2 million and $17.6 million of interest costs, respectively, and $28.2 million , $29.2 million and $33.2 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 property. Based on periodic tests of recoverability of long-lived assets, for the year ended December 31, 2014 , we recorded a provision for real estate impairment losses of $1.8 million related to sold apartment communities, and we recorded no such provisions during the years ended December 31, 2015 and 2013 .
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.
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. 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.
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, our share of the earnings or losses of the entity for the periods being presented is included in equity in earnings or losses from unconsolidated real estate partnerships (within other, net in our consolidated statements of operations), inclusive of our share of any impairments and disposition gains recognized by and related to such entities. The excess of the cost of the acquired partnership interests over the historical carrying amount of partners’ equity or deficit is ascribed generally 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 a component of equity in earnings or losses from unconsolidated real estate partnerships. Investments in Securitization Trust that holds Aimco Property Debt We hold investments in a securitization trust which 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 6 for further information regarding these securities.
Intangible Assets	Intangible Assets At December 31, 2015 and 2014 , other assets included goodwill associated with our reportable segments of $43.9 million and $45.1 million , respectively. We perform an annual impairment test of goodwill that compares the fair value of reporting units with their carrying amounts, including goodwill. We determined that our goodwill was not impaired in 2015 , 2014 or 2013 . During the years ended December 31, 2015 , 2014 and 2013 , we allocated $1.2 million , $3.9 million and $5.5 million , respectively, of goodwill related to our reportable segments (conventional and affordable real estate operations) 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 and the retained portions of the reporting units to which the goodwill as allocated. Intangible assets also includes amounts related to in-place leases as discussed under the Acquisition of Real Estate Assets and Related Depreciation and Amortization heading.
Capitalized Software Costs	Capitalized Software Costs Purchased software and other costs related to software 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 five years. For the years ended December 31, 2015 , 2014 and 2013 , we capitalized software purchase and development costs totaling $3.6 million , $4.4 million and $3.3 million , respectively. At December 31, 2015 and 2014 , other assets included $16.4 million and $19.7 million of net capitalized software, respectively. During the years ended December 31, 2015 , 2014 and 2013 , we recognized amortization of capitalized software of $6.9 million , $6.7 million and $8.9 million , respectively, which is included in depreciation and amortization in our consolidated statements of operations.
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. However, as discussed in Note 3 , we continue to consolidate certain partnerships and apartment communities associated with the legacy asset management business for which the derecognition criteria associated with our sale of the portfolio have not been met. We do not control the execution of sales and other events related to the assets that will lead to the to the liquidation of these partnerships and derecognition of the associated noncontrolling interests. The aggregate carrying amount of noncontrolling interests in consolidated real estate partnerships totaled $151.4 million and $233.3 million at December 31, 2015 and 2014 , respectively. These noncontrolling interests included $0.1 million (deficit) and $44.1 million , respectively, associated with the noncontrolling interests in the legacy asset management business at December 31, 2015 and 2014 . 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, 2015 , 2014 and 2013 is shown in our consolidated statements of equity and partners’ capital and further discussed in Note 3 . 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 sales of real estate and accordingly the effect on our equity and partners’ capital is reflected within the the amount of net income attributable to us and to noncontrolling interests. In accordance with FASB Accounting Standards Codification, or ASC, Topic 810, 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, HPUs and preferred OP Units. Within Aimco’s consolidated financial statements, the Aimco Operating Partnership’s income or loss is allocated to the holders of common partnership units and equivalents based on the weighted average number of common partnership units (including those held by Aimco) and equivalents outstanding during the period. During the years ended December 31, 2015 , 2014 and 2013 , the holders of common OP Units and equivalents had a weighted average ownership interest in the Aimco Operating Partnership of 4.7% , 5.0% and 5.2% , respectively. Holders of the preferred OP Units participate in the Aimco Operating Partnership’s income or loss only to the extent of their preferred distributions. See Note 10 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 property management, asset management, syndication and other services when the related fees are earned and are realized or realizable.
Insurance	Insurance We believe that 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 insurance coverage for substantial portions of our property, workers’ compensation, health, and general liability exposures. Losses are accrued 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 related to restricted stock awards and employee stock options, based on the grant date fair value and recognize compensation cost, net of forfeitures, over the awards’ requisite service periods. See Note 11 for further discussion of our share-based compensation.
Tax Credit Arrangements	Tax Credit Arrangements We sponsor certain partnerships that operate qualifying affordable housing apartment communities and 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 . Typically, we are the general partner with a legal ownership interest of one percent or less and unaffiliated institutional investors (which we refer to as tax credit investors or investors) acquire the limited partnership interests ( at least 99% ). At inception, each investor agrees to fund capital contributions to the partnerships and we receive a syndication fee from the partnerships upon the investors’ admission to the partnership. We have determined that the partnerships in these arrangements are VIEs and, where we are general partner, we are generally the primary beneficiary that is required to consolidate the partnerships. 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 account for these partnerships as wholly-owned subsidiaries, recognizing the income or loss generated by the underlying real estate based on our economic interest in the partnerships. 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 sheet 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.
Income Taxes	Income Taxes We have elected to be taxed as a REIT under the Code commencing with our taxable year ended December 31, 1994, and intend to continue to operate in such a manner. Our current and continuing qualification as a REIT depends on our ability to meet the various requirements imposed by the 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 we qualify for taxation as a REIT, we will generally not be subject to United States Federal corporate income tax on our 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 we qualify as a REIT, we may be subject to United States Federal income and excise taxes in various situations, such as on our undistributed income. We also will be required to pay a 100% tax on any net income on non-arm’s length transactions between us and a TRS (described below) and on any net income from sales of apartment communities that were held for sale to customers in the ordinary course. In addition, we could also be subject to the alternative minimum tax, or AMT, on our items of tax preference. The state and local tax laws may not conform to the United States Federal income tax treatment, and we 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, asset 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. We recognize the tax consequences associated with intercompany transfers between the REIT and TRS entities when the related assets affect our GAAP income or loss, generally through depreciation, impairment losses, or sales to third party entities. Refer to Note 8 for further information about our income taxes.
Discontinued Operations	Discontinued Operations In April 2014, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, or ASU 2014-08. ASU 2014-08 revised the definition of, and the requirements for reporting, a “discontinued operation.” Specifically, ASU 2014-08 revised the reporting requirements to only allow a component of an entity, or group of components of an entity, to be reported in discontinued operations if their disposal represents a “strategic shift that has (or will have) a major effect on an entity’s operations and financial results.” For public companies, ASU 2014-08 was required to be applied prospectively to disposals of components of an entity or classifications as held for sale of components of an entity that occur in annual periods commencing after December 15, 2014; however, as permitted by the transition provisions, we elected to adopt ASU 2014-08 effective January 1, 2014, for disposals (or classifications as held for sale) that had not been reported in financial statements previously issued. Under ASU 2014-08, we believe routine sales of apartment communities and certain groups of apartment communities generally do not meet the requirements for reporting within discontinued operations. In accordance with GAAP prior to our adoption of ASU 2014-08, we reported the results of apartment communities that met the definition of a component of an entity and had been sold or met the criteria to be classified as held for sale as discontinued operations. For years ended December 31, 2013, or earlier, and interim periods within those years, we included the results of such apartment communities, including any gain or loss on their disposition, less applicable income taxes, in income from discontinued operations within the consolidated statements of operations. See Note 12 for additional information regarding discontinued operations.
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 6 , 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, 2015 , 2014 and 2013 , along with the corresponding amounts of such comprehensive income attributable to Aimco, the Aimco Operating Partnership and to noncontrolling interests, is presented within the accompanying consolidated statements of comprehensive income.
Earnings Per Share	Earnings per Share and Unit Aimco calculates earnings (loss) per share based on the weighted average number of shares of Common Stock, participating securities, common stock equivalents and dilutive convertible securities outstanding during the period. The Aimco Operating Partnership calculates earnings (loss) per unit based on the weighted average number of common partnership units and equivalents, participating securities and dilutive convertible securities outstanding during the period. The Aimco Operating Partnership considers both common partnership units and HPUs, which have identical rights to distributions and undistributed earnings, to be common units for purposes of the earnings per unit computations. See Note 13 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.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements In May 2014, the FASB and International Accounting Standards Board issued their final standard on revenue from contracts with customers, which was issued by the FASB as Accounting Standards Update 2014-09, Revenue from Contracts with Customers , or ASU 2014-09. ASU 2014-09, which establishes a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers, supersedes most current GAAP applicable to revenue recognition and converges United States and international accounting standards in this area. The core principle of the new guidance is that revenue shall 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. ASU 2014-09 is effective for public entities for annual reporting periods beginning after December 15, 2017, with early adoption permitted in years beginning after December 15, 2016, and allows for full retrospective adoption applied to all periods presented or modified retrospective adoption with the cumulative effect of initially applying the standard recognized at the date of initial application. We have not yet determined the effect ASU 2014-09 will have on our consolidated financial statements. In February 2015, the FASB issued Accounting Standards Update 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis , or ASU 2015-02, which significantly changes the consolidation analysis required under GAAP for VIEs. Under this revised guidance, it is less likely that certain fees, such as asset management fees, would be considered variable interests and therefore fewer entities may be considered VIEs. Additionally, limited partnerships may no longer be viewed as VIEs if the limited partners hold certain rights over the general partner. Alternatively, limited partnerships not previously viewed as VIEs may now be considered VIEs in the absence of such rights. For public companies, the guidance in ASU 2015-02 is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2015, with early adoption permitted. We will adopt the guidance in ASU 2015-02 in connection with our March 31, 2016, financial statements. We have substantially completed our analysis of the effect adoption of ASU 2015-02 will have on our consolidated financial statements. We anticipate the Aimco Operating Partnership and all non-wholly owned real estate partnerships will meet the revised characteristics of a VIE, resulting in additional disclosure; however, we do not expect to consolidate any presently unconsolidated entities or to deconsolidate any presently consolidated entities as a result of the accounting change. In April 2015, the FASB issued ASU 2015-03, Interest—Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs, or ASU 2015-03, to revise the presentation of debt issuance costs. Under ASU 2015-03, entities generally will present debt issuance costs in their balance sheet as a direct deduction from the related debt liability rather than as an asset. Amortization of the deferred costs will continue to be included in interest expense. In August 2015, the FASB issued ASU 2015-15, Interest—Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements—Amendments to SEC Paragraphs Pursuant to Staff Announcement at June 18, 2015 EITF Meeting (SEC Update), or ASU 2015-15, to clarify the SEC staff’s position regarding the presentation and subsequent measurement of debt issuance costs related to line-of-credit arrangements due to the lack of guidance on this topic in ASU 2015-03. The SEC staff recently announced that it would not object to an entity deferring and presenting debt issuance costs associated with line-of-credit arrangements as an asset and subsequently amortizing the deferred debt issuance costs ratably over the term of the arrangement, regardless of whether there are any outstanding borrowings under the arrangement. For public companies, the guidance in ASUs 2015-03 and 2015-15, which is to be applied retrospectively to all prior periods, is effective for fiscal years beginning after December 15, 2015, with early adoption permitted for financial statements that have not been previously issued. We will adopt the guidance in ASUs 2015-03 and 2015-15 in connection with our March 31, 2016, financial statements. We do not expect ASUs 2015-03 and 2015-15 to have a significant effect on our consolidated financial statements.

Fair Value Measurements - (Pol

Fair Value Measurements - (Policies)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	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) securities, and our interest rate swaps. Information regarding these items measured at fair value, both of which are classified within Level 2 of the GAAP fair value hierarchy, is presented below (in thousands): AFS Investments Interest Rate Swaps Total Fair value at December 31, 2013 $ 58,408 $ (4,604 ) $ 53,804 Investment accretion 3,827 — 3,827 Unrealized losses included in interest expense — (48 ) (48 ) Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss — 1,685 1,685 Unrealized losses included in equity and partners’ capital (1,192 ) (2,306 ) (3,498 ) Fair value at December 31, 2014 $ 61,043 $ (5,273 ) $ 55,770 Investment accretion 4,245 — 4,245 Unrealized losses included in interest expense — (44 ) (44 ) Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss — 1,678 1,678 Unrealized gains (losses) included in equity and partners’ capital 214 (1,299 ) (1,085 ) Fair value at December 31, 2015 $ 65,502 $ (4,938 ) $ 60,564 Our investments classified as AFS are presented within other assets in the accompanying consolidated balance sheets. We hold positions in the securitization which pay interest currently, and we also hold the first loss position in the securitization 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, 2015 , was approximately 5.4 years. Our amortized cost basis for these investments, which represents the original cost adjusted for interest accretion less interest payments received, was $67.8 million and $63.6 million at December 31, 2015 and 2014 , respectively. We estimate the fair value of these investments in accordance with GAAP 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, which typically moves in an inverse relationship with the movements in interest rates, exceeded the amortized cost of these investments at the balance sheet dates. The fair value of the first loss position, which is less correlated to movements in interest rates, was less than the amortized cost at the balance sheet dates. We currently expect to hold the investments to their maturity dates and we believe we will fully recover our basis in the investments. Accordingly, we believe the current impairment in the fair value, as compared to the amortized cost basis, of the first loss position is temporary and we have not recognized any of the loss in value in earnings. For our variable rate debt, we are sometimes required by limited partners in our consolidated real estate partnerships to limit our exposure to interest rate fluctuations by entering into interest rate swap agreements, which moderate our exposure to interest rate risk by effectively converting the interest on variable rate debt 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. As of December 31, 2015 and 2014 , we had interest rate swaps with aggregate notional amounts of $49.9 million and $50.3 million , respectively. As of December 31, 2015 , these swaps had a weighted average remaining term of 5.0 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 in 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, 2015 , remain constant, we estimate that during the next 12 months, we would reclassify into earnings approximately $1.7 million of the unrealized losses in accumulated other comprehensive loss. If market interest rates increase above the 3.43% 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.

Basis of Presentation and Sum27

Basis of Presentation and Summary of Significant Accounting Policies - (Tables)	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Other Assets	2015 2014 Deferred financing costs, net $ 26,126 $ 30,320 Investments in unconsolidated real estate partnerships 15,401 16,046 Investments in securitization trust that holds Aimco property debt 65,502 61,043 Intangible assets, net 45,447 49,441 Deferred tax asset, net (Note 8) 26,117 252 Assets related to the legacy asset management business (Note 3) 156,389 161,135 Prepaid expenses, accounts and notes receivable, deposits and other 138,936 158,490 Other assets per consolidated balance sheets $ 473,918 $ 476,727
Schedule of expected amortization of deferred revenue leases	2016 2017 2018 2019 2020 Estimated amortization $ 1,337 $ 1,239 $ 1,095 $ 1,007 $ 915

Significant Transactions - (Ta

Significant Transactions - (Tables)	12 Months Ended
	Dec. 31, 2015
Significant Transactions [Abstract]
Schedule of Business Acquisitions [Table Text Block]	Year Ended December 31, 2015 2014 Number of apartment communities 3 6 Number of apartment homes 300 1,182 Acquisition price $ 129,150 $ 291,925 Non-recourse property debt assumed (outstanding principal balance) — 65,200 Non-recourse property debt assumed (fair value) — 64,817 Total fair value allocated to land 10,742 70,961 Total fair value allocated to buildings and improvements 118,366 217,851
Balance Sheets Related to Legally Sold Portfolio [Table Text Block]	The portfolio’s assets and liabilities included in other assets in our consolidated balance sheets are summarized below (in thousands). December 31, 2015 2014 Real estate, net $ 108,119 $ 117,851 Cash and cash equivalents 33,725 23,133 Investment in unconsolidated real estate partnerships and other assets 14,545 20,151 Total assets $ 156,389 $ 161,135 Total indebtedness $ 148,761 $ 113,641 Accrued and other liabilities 7,055 4,417 Total liabilities 155,816 118,058 Noncontrolling interests in consolidated real estate partnerships (111 ) 44,106 Equity attributable to Aimco and the Aimco Operating Partnership 684 (1,029 ) Total liabilities and equity $ 156,389 $ 161,135
Statement of Income Related to Legally Sold Portfolio [Table Text Block]	Year Ended December 31, 2015 2014 2013 Revenues $ 26,203 $ 27,701 $ 23,711 Expenses (21,520 ) (21,472 ) (21,188 ) Equity in earnings or loss of unconsolidated entities, gains or losses on dispositions and other, net (4,495 ) (6,996 ) (748 ) Net income (loss) related to legacy asset management business 188 (767 ) 1,775 Income tax (expense) benefit associated with legacy asset management business (1,967 ) 3 (639 ) Noncontrolling interests in consolidated real estate partnerships 5,420 (403 ) 21,370 Net income (loss) of legacy asset management business attributable to Aimco and the Aimco Operating Partnership $ 3,641 $ (1,167 ) $ 22,506

Investments in Unconsolidated29

Investments in Unconsolidated Real Estate Partnerships - (Tables)	12 Months Ended
	Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Financial information for the unconsolidated real estate partnerships	The following table provides selected combined financial information for the unconsolidated real estate partnerships in which we had investments accounted for under the equity method as of and for the years ended December 31, 2015 , 2014 and 2013 (in thousands): 2015 2014 2013 Total assets $ 84,796 $ 85,492 $ 93,242 Total liabilities 52,685 54,472 64,859 Partners’ capital 32,111 31,020 28,383 Rental and other property revenues 12,193 12,978 16,268 Property operating expenses (5,473 ) (6,233 ) (8,470 ) Depreciation and amortization (1,841 ) (3,081 ) (3,300 ) Interest expense (2,520 ) (2,785 ) (4,185 ) Gain on sale and impairment losses, net — — 36,212 Net income 1,720 688 35,909

Non-Recourse Property Debt an30

Non-Recourse Property Debt and Credit Agreement - (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Summarizes property loans payable related to properties classified as held for use	The following table summarizes our property debt related to assets classified as held for use at December 31, 2015 and 2014 (dollars in thousands): Principal Outstanding 2015 2014 Fixed rate property debt $ 3,761,238 $ 3,902,642 Variable rate property debt 84,922 120,167 Total property debt $ 3,846,160 $ 4,022,809
Scheduled principal amortization and maturity payments	As of December 31, 2015 , the scheduled principal amortization and maturity payments for our non-recourse property debt related to apartment communities classified as held for use are as follows (in thousands): Amortization Maturities Total 2016 $ 76,798 $ 249,175 $ 325,973 2017 75,472 325,853 401,325 2018 73,698 207,616 281,314 2019 68,418 518,323 586,741 2020 61,731 303,741 365,472 Thereafter 1,885,335 $ 3,846,160

Fair Value Measurements - (Tab

Fair Value Measurements - (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair value of assets and liabilities measured on a recurring basis	AFS Investments Interest Rate Swaps Total Fair value at December 31, 2013 $ 58,408 $ (4,604 ) $ 53,804 Investment accretion 3,827 — 3,827 Unrealized losses included in interest expense — (48 ) (48 ) Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss — 1,685 1,685 Unrealized losses included in equity and partners’ capital (1,192 ) (2,306 ) (3,498 ) Fair value at December 31, 2014 $ 61,043 $ (5,273 ) $ 55,770 Investment accretion 4,245 — 4,245 Unrealized losses included in interest expense — (44 ) (44 ) Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss — 1,678 1,678 Unrealized gains (losses) included in equity and partners’ capital 214 (1,299 ) (1,085 ) Fair value at December 31, 2015 $ 65,502 $ (4,938 ) $ 60,564

Commitments and Contingencies

Commitments and Contingencies - (Tables)	12 Months Ended
	Dec. 31, 2015
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 and Equipment Lease Obligations Ground Lease Obligations Total Operating Lease Obligations 2016 $ 3,061 $ 795 $ 3,856 2017 2,361 895 3,256 2018 1,062 995 2,057 2019 226 1,095 1,321 2020 153 1,331 1,484 Thereafter — 67,876 67,876 Total $ 6,863 $ 72,987 $ 79,850

Income Taxes - (Tables)

Income Taxes - (Tables)	12 Months Ended
	Dec. 31, 2015
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, 2015 2014 Deferred tax liabilities: Real estate and real estate partnership basis differences $ 31,726 $ 38,231 Deferred tax assets: Net operating, capital and other loss carryforwards $ 8,024 $ 6,699 Accruals and expenses 4,917 5,430 Tax credit carryforwards 49,036 29,714 Management contracts and other 333 267 Total deferred tax assets 62,310 42,110 Valuation allowance (4,467 ) (3,627 ) Net deferred income tax assets $ 26,117 $ 252
Reconciliation of unrecognized tax benefits	A reconciliation of the beginning and ending balance of our unrecognized tax benefits is presented below (in thousands): 2015 2014 2013 Balance at January 1 $ 2,286 $ 2,871 $ 3,536 Reductions as a result of a lapse of the applicable statutes — — (764 ) Additions (reductions) based on tax positions related to prior years and current year excess benefits related to stock-based compensation 611 (585 ) 99 Balance at December 31 $ 2,897 $ 2,286 $ 2,871
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 continuing operations, income from discontinued operations, net of tax, and gain on dispositions or real estate, net of tax, in our statements of operations for the years ended December 31, 2015 , 2014 and 2013 (in thousands): 2015 2014 2013 Current: Federal $ 1,310 $ — $ — State 1,357 970 63 Total current 2,667 970 63 Deferred: Federal (27,382 ) 11,556 7,621 State (1,052 ) 3,485 1,685 Total deferred (28,434 ) 15,041 9,306 Total (benefit) expense $ (25,767 ) $ 16,011 $ 9,369 Classification: Continuing operations $ (27,524 ) $ (20,047 ) $ (1,959 ) Discontinued operations $ — $ — $ 11,328 Gain on dispositions of real estate $ 1,757 $ 36,058 $ —
Reconciliation of income tax attributable to continuing and discontinued operations	The reconciliation of income tax attributable to continuing and discontinued operations computed at the United States statutory rate to income tax (benefit) expense is shown below (dollars in thousands): 2015 2014 2013 Amount Percent Amount Percent Amount Percent Tax at United States statutory rates on consolidated income or loss subject to tax $ (10,947 ) 35.0 % $ 47,950 35.0 % $ 16,326 35.0 % State income tax expense, net of Federal tax (benefit) expense (361 ) 1.2 % 4,364 3.2 % 1,748 3.7 % Effect of permanent differences (27 ) 0.1 % (154 ) (0.1 )% (296 ) (0.6 )% Tax effect of intercompany transfers of assets between the REIT and TRS entities (1) (1,515 ) 4.8 % (23,969 ) (17.5 )% (4,272 ) (9.2 )% Tax credits (13,583 ) 43.4 % (12,271 ) (9.0 )% (4,137 ) (8.9 )% Increase in valuation allowance 666 (2.1 )% 91 0.1 % — — % Total income tax (benefit) expense $ (25,767 ) 82.4 % $ 16,011 11.7 % $ 9,369 20.0 % (1) Includes the effect of intercompany asset transfers between the Aimco Operating Partnership and TRS entities, for which tax is deferred and recognized as the assets affect GAAP income or loss, for example, through depreciation, impairment, or upon the sale of the asset to a third party.
Dividends paid to holders of Common Stock	For the years ended December 31, 2015 , 2014 and 2013 , dividends per share held for the entire year were estimated to be taxable as follows: 2015 2014 2013 Amount Percentage Amount Percentage Amount Percentage Ordinary income $ 0.36 30.2 % $ 0.01 0.6 % $ 0.17 17.9 % Capital gains 0.37 31.3 % 0.53 51.6 % 0.13 13.9 % Qualified dividends 0.17 14.5 % — — % — — % Unrecaptured Section 1250 gain 0.28 24.0 % 0.50 47.8 % 0.66 68.2 % $ 1.18 100.0 % $ 1.04 100.0 % $ 0.96 100.0 %

Aimco Equity - (Tables)

Aimco Equity - (Tables)	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Classes of perpetual preferred stock	At December 31, 2015 and 2014 , Aimco had the following classes of perpetual preferred stock outstanding (dollars in thousands): Redemption Annual Dividend Rate Per Share (paid quarterly) Balance December 31, Date (1) 2015 2014 Class A Cumulative Preferred Stock, 5,000,000 shares authorized and 5,000,000 shares issued/outstanding 5/17/2019 6.88% $ 125,000 $ 125,000 Class Z Cumulative Preferred Stock, 4,800,000 shares authorized and 1,391,643 shares issued/outstanding, respectively 7/29/2016 7.00% 34,126 34,126 Series A Community Reinvestment Act (CRA) Preferred Stock, 240 shares authorized and zero and 54 shares issued/outstanding, respectively 6/30/2011 (2) — 27,000 Preferred stock per consolidated balance sheets $ 159,126 $ 186,126 (1) All classes of preferred stock are or were redeemable at our option on and after the dates specified. (2) The dividend rate was a variable rate per annum equal to the Three-Month LIBOR Rate (as defined in the articles supplementary designating the Series A Community Reinvestment Act Perpetual Preferred Stock, or CRA Preferred Stock) plus 1.25%, calculated as of the beginning of each quarterly dividend period . The rate at December 31, 2014 was 1.48% .
Issuance of preferred stock	The following table summarizes our issuances of Class A Preferred Stock and Class Z Preferred Stock during the year ended December 31, 2014 (dollars in thousands, except per share amounts): Class A Cumulative Preferred Stock Class Z Cumulative Preferred Stock Number of shares of preferred stock issued 5,000,000 117,400 Price to public per share $ 25.00 $ 25.65 Underwriting discounts, commissions and transaction costs per share $ 0.85 $ 0.51 Net proceeds per share $ 24.15 $ 25.14 Net proceeds to Aimco $ 120,757 $ 2,901 Issuance costs (primarily underwriting commissions) recognized as an adjustment of additional paid-in capital $ 4,350 $ 110

Partners Capital - (Tables)

Partners Capital - (Tables)	12 Months Ended
	Dec. 31, 2015
Partners' Capital [Abstract]
Schedule of Preferred Units	As of December 31, 2015 and 2014 , 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 2015 2014 2015 2014 Class One 8.75 % $ 8.00 90,000 90,000 $ 8,229 $ 8,229 Class Two 1.92 % $ 0.46 18,124 18,589 453 465 Class Three 7.88 % $ 1.97 1,341,289 1,341,485 33,532 33,537 Class Four 8.00 % $ 2.00 644,954 644,954 16,124 16,124 Class Six 8.50 % $ 2.13 790,883 790,883 19,772 19,772 Class Seven 7.87 % $ 1.97 27,960 27,960 699 699 Class Nine 6.00 % $ 1.50 364,668 364,668 9,117 9,117 Total 3,277,878 3,278,539 $ 87,926 $ 87,943
Temporary Equity	2015 2014 2013 Balance at January 1 $ 87,937 $ 79,953 $ 80,046 Preferred distributions (6,943 ) (6,409 ) (6,423 ) Redemption of preferred units and other (11 ) (1,221 ) (93 ) Issuance of preferred units — 9,117 — Net income 6,943 6,497 6,423 Balance at December 31 $ 87,926 $ 87,937 $ 79,953

Share-Based Compensation - (Ta

Share-Based Compensation - (Tables)	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of assumptions used in Monte Carlo models for TSR awards	The grant date fair value for the TSR Restricted Stock awards, which was calculated using a Monte Carlo model, and certain of the assumptions used in such calculation for awards granted in 2015 are set forth below: 2015 Grant date fair value $ 39.72 Baseline common share value $ 39.05 Dividend yield 2.87 % Expected volatility of common shares 19.48 % Risk-free interest rate 1.04 % Derived vesting period 3.4 years
Summary of TSR stock awards	The following table summarizes activity for TSR Restricted Stock awards for the year ended December 31, 2015 (numbers of shares in thousands): 2015 Number of Shares Weighted Unvested at beginning of year — $ — Granted 142 39.72 Forfeited (19 ) 39.72 Unvested at end of year 123 $ 39.72
Summary of outstanding stock options	The following table summarizes activity for our outstanding stock options, with service conditions (i.e. time-based vesting that requires continuous employment) for the years ended December 31, 2015 , 2014 and 2013 (numbers of options in thousands): 2015 2014 2013 Number of Options Weighted Number of Options Weighted Number of Options Weighted Outstanding at beginning of year 1,640 $ 28.91 2,991 $ 28.48 3,045 $ 28.39 Granted 239 39.05 — — — — Exercised (484 ) 28.33 (1,347 ) 27.97 (44 ) 22.52 Forfeited (1 ) 25.78 (4 ) 25.45 (10 ) 27.82 Outstanding at end of year 1,394 $ 30.85 1,640 $ 28.91 2,991 $ 28.48 Exercisable at end of year 1,155 $ 29.16 1,640 $ 28.91 2,991 $ 28.48
Weighted average fair value of options and valuation assumptions	The weighted average fair value of options and our valuation assumptions for the 2015 grants were as follows: 2015 Weighted average grant-date fair value $ 6.97 Assumptions: Risk-free interest rate 1.68 % Expected dividend yield 2.87 % Expected volatility 25.19 % Weighted average expected life of options 5.5 years
Summary of restricted stock awards	The following table summarizes activity for restricted stock awards with service conditions, or Time-Based Restricted Stock awards, for the years ended December 31, 2015 , 2014 and 2013 (numbers of shares in thousands): 2015 2014 2013 Number of Shares Weighted Number of Shares Weighted Number of Shares Weighted Unvested at beginning of year 513 $ 26.34 575 $ 25.28 526 $ 22.69 Granted 145 39.39 196 26.69 253 27.86 Vested (259 ) 27.54 (238 ) 24.07 (204 ) 21.81 Forfeited (60 ) 32.29 (20 ) 26.26 — — Unvested at end of year 339 $ 29.96 513 $ 26.34 575 $ 25.28

Assets Held for Sale and Disc37

Assets Held for Sale and Discontinued Operations - (Tables)	12 Months Ended
	Dec. 31, 2015
Discontinued Operations and Disposal Groups [Line Items]
Summary of properties disposed by sale, not discontinued operations	Summarized information regarding apartment communities sold during the years ended December 31, 2015 and 2014 is set forth in the table below (dollars in thousands): Year Ended December 31, 2015 2014 Apartment communities sold 11 30 Apartment homes sold 3,855 9,067 Income before income taxes and discontinued operations $ 14,191 $ 55,122
Summary of discontinued operations	2013 Income before gain on dispositions of real estate and income tax $ 2,098 Gain on dispositions of real estate 212,459 Income tax expense (11,328 ) Income from discontinued operations, net of tax $ 203,229 Income from discontinued operations attributable to noncontrolling interests in consolidated real estate partnerships (31,842 ) Income from discontinued operations attributable to the Aimco Operating Partnership $ 171,387 Income from discontinued operations attributable to noncontrolling interests in Aimco Operating Partnership (9,248 ) Income from discontinued operations attributable to Aimco $ 162,139

Earnings (Loss) per Share_Unit

Earnings (Loss) per Share/Unit - (Tables)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share
Earnings (Loss) per Share/Unit		The following table illustrates Aimco’s calculation of basic and diluted earnings (loss) per share for the years ended December 31, 2015 , 2014 and 2013 (in thousands, except per share data): 2015 2014 2013 Numerator: Income from continuing operations $ 91,390 $ 67,475 $ 34,596 Gain on dispositions of real estate, net of tax 180,593 288,636 — (Income) loss from continuing operations and gain on dispositions attributable to noncontrolling interests (23,273 ) (46,862 ) 10,555 Income attributable to preferred stockholders (11,794 ) (7,947 ) (2,804 ) Income attributable to participating securities (950 ) (1,082 ) (813 ) Income from continuing operations attributable to Aimco common stockholders $ 235,966 $ 300,220 $ 41,534 Income from discontinued operations, net of tax $ — $ — $ 203,229 Income from discontinued operations attributable to noncontrolling interests — — (41,090 ) Income from discontinued operations attributable to Aimco common stockholders $ — $ — $ 162,139 Net income $ 271,983 $ 356,111 $ 237,825 Net income attributable to noncontrolling interests (23,273 ) (46,862 ) (30,535 ) Net income attributable to preferred stockholders (11,794 ) (7,947 ) (2,804 ) Net income attributable to participating securities (950 ) (1,082 ) (813 ) Net income attributable to Aimco common stockholders $ 235,966 $ 300,220 $ 203,673 Denominator: Weighted average common shares outstanding – basic 155,177 145,639 145,291 Dilutive potential common shares 393 363 241 Weighted average common shares outstanding – diluted 155,570 146,002 145,532 Earnings per common share – basic and diluted: Income from continuing operations attributable to Aimco common stockholders $ 1.52 $ 2.06 $ 0.29 Income from discontinued operations attributable to Aimco common stockholders — — 1.11 Net income attributable to Aimco common stockholders $ 1.52 $ 2.06 $ 1.40 Dividends declared per common share $ 1.18 $ 1.04 $ 0.96
AIMCO PROPERTIES, L.P.
Earnings Per Share
Earnings (Loss) per Share/Unit	The following table illustrates the Aimco Operating Partnership’s calculation of basic and diluted earnings per common unit for the years ended December 31, 2015 , 2014 and 2013 (in thousands, except per unit data): 2015 2014 2013 Numerator: Income from continuing operations $ 91,390 $ 67,475 $ 34,596 Gain on dispositions of real estate, net of tax 180,593 288,636 — (Income) loss from continuing operations and gain on dispositions attributable to noncontrolling interests (4,776 ) (24,595 ) 19,369 Income attributable to the Aimco Operating Partnership’s preferred unitholders (18,737 ) (14,444 ) (9,227 ) Income attributable to participating securities (950 ) (1,082 ) (813 ) Income from continuing operations attributable to the Aimco Operating Partnership’s common unitholders $ 247,520 $ 315,990 $ 43,925 Income from discontinued operations, net of tax $ — $ — $ 203,229 Income from discontinued operations attributable to noncontrolling interests — — (31,842 ) Income from discontinued operations attributable to the Aimco Operating Partnership’s common unitholders $ — $ — $ 171,387 Net income $ 271,983 $ 356,111 $ 237,825 Net income attributable to noncontrolling interests (4,776 ) (24,595 ) (12,473 ) Net income attributable to the Aimco Operating Partnership’s preferred unitholders (18,737 ) (14,444 ) (9,227 ) Net income attributable to participating securities (950 ) (1,082 ) (813 ) Net income attributable to the Aimco Operating Partnership’s common unitholders $ 247,520 $ 315,990 $ 215,312 Denominator: Weighted average common units outstanding – basic 162,834 153,363 153,256 Dilutive potential common units 393 363 241 Weighted average common units outstanding – diluted 163,227 153,726 153,497 Earnings per common unit – basic and diluted: Income from continuing operations attributable to the Partnership’s common unitholders $ 1.52 $ 2.06 $ 0.29 Income from discontinued operations attributable to the Partnership’s common unitholders — — 1.11 Net income attributable to the Partnership’s common unitholders $ 1.52 $ 2.06 $ 1.40 Distributions declared per common unit $ 1.18 $ 1.04 $ 0.96

Unaudited Summarized Consolid39

Unaudited Summarized Consolidated Quarterly Information - (Tables)	12 Months Ended
	Dec. 31, 2015
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, 2015 and 2014 , is provided below (in thousands, except per share amounts). Quarter 2015 First Second Third Fourth Total revenues $ 244,265 $ 244,783 $ 246,387 $ 245,875 Total operating expenses (183,198 ) (179,140 ) (182,366 ) (180,391 ) Operating income 61,067 65,643 64,021 65,484 Income from continuing operations 18,457 23,907 23,769 25,257 Gain on dispositions of real estate, net of tax 85,693 44,781 — 50,119 Net income 104,150 68,688 23,769 75,376 Net income attributable to Aimco common stockholders $ 89,344 $ 60,804 $ 19,179 $ 66,639 Earnings per common share - basic: Income from continuing operations attributable to Aimco common stockholders $ 0.58 $ 0.39 $ 0.12 $ 0.43 Net income attributable to Aimco common stockholders $ 0.58 $ 0.39 $ 0.12 $ 0.43 Earnings per common share - diluted: Income from continuing operations attributable to Aimco common stockholders $ 0.58 $ 0.39 $ 0.12 $ 0.43 Net income attributable to Aimco common stockholders $ 0.58 $ 0.39 $ 0.12 $ 0.43 Weighted average common shares outstanding - basic 153,821 155,524 155,639 155,725 Weighted average common shares outstanding - diluted 154,277 155,954 156,008 156,043 Quarter 2014 First Second Third Fourth Total revenues $ 248,924 $ 246,418 $ 246,843 $ 242,178 Total operating expenses (183,646 ) (180,621 ) (179,376 ) (178,370 ) Operating income 65,278 65,797 67,467 63,808 Income from continuing operations 12,040 17,943 18,186 19,306 Gain on dispositions of real estate, net of tax 69,492 66,662 126,329 26,153 Net income 81,532 84,605 144,515 45,459 Net income attributable to Aimco common stockholders $ 64,235 $ 75,010 $ 124,706 $ 36,269 Earnings per common share - basic: Income from continuing operations attributable to Aimco common stockholders $ 0.44 $ 0.51 $ 0.86 $ 0.25 Net income attributable to Aimco common stockholders $ 0.44 $ 0.51 $ 0.86 $ 0.25 Earnings per common share - diluted: Income from continuing operations attributable to Aimco common stockholders $ 0.44 $ 0.51 $ 0.85 $ 0.25 Net income attributable to Aimco common stockholders $ 0.44 $ 0.51 $ 0.85 $ 0.25 Weighted average common shares outstanding - basic 145,473 145,657 145,672 145,753 Weighted average common shares outstanding - diluted 145,681 145,985 146,104 146,238
AIMCO PROPERTIES, L.P.
Schedule of Unaudited Quarterly Financial Information [Line Items]
Summarized unaudited consolidated quarterly information	Quarter 2015 First Second Third Fourth Total revenues $ 244,265 $ 244,783 $ 246,387 $ 245,875 Total operating expenses (183,198 ) (179,140 ) (182,366 ) (180,391 ) Operating income 61,067 65,643 64,021 65,484 Income from continuing operations 18,457 23,907 23,769 25,257 Gain on dispositions of real estate, net of tax 85,693 44,781 — 50,119 Net income 104,150 68,688 23,769 75,376 Net income attributable to the Partnership’s common unitholders $ 93,742 $ 63,776 $ 20,072 $ 69,930 Earnings per common unit - basic: Income from continuing operations attributable to the Partnership’s common unitholders $ 0.58 $ 0.39 $ 0.12 $ 0.43 Net income attributable to the Partnership’s common unitholders $ 0.58 $ 0.39 $ 0.12 $ 0.43 Earnings per common unit - diluted: Income from continuing operations attributable to the Partnership’s common unitholders $ 0.58 $ 0.39 $ 0.12 $ 0.43 Net income attributable to the Partnership’s common unitholders $ 0.58 $ 0.39 $ 0.12 $ 0.43 Weighted average common units outstanding - basic 161,461 163,149 163,241 163,485 Weighted average common units outstanding - diluted 161,917 163,579 163,610 163,803 Quarter 2014 First Second Third Fourth Total revenues $ 248,924 $ 246,418 $ 246,843 $ 242,178 Total operating expenses (183,646 ) (180,621 ) (179,376 ) (178,370 ) Operating income 65,278 65,797 67,467 63,808 Income from continuing operations 12,040 17,943 18,186 19,306 Gain on dispositions of real estate, net of tax 69,492 66,662 126,329 26,153 Net income 81,532 84,605 144,515 45,459 Net income attributable to the Partnership’s common unitholders $ 67,846 $ 78,745 $ 131,255 $ 38,144 Earnings per common unit - basic: Income from continuing operations attributable to the Partnership’s common unitholders $ 0.44 $ 0.51 $ 0.86 $ 0.25 Net income attributable to the Partnership’s common unitholders $ 0.44 $ 0.51 $ 0.86 $ 0.25 Earnings per common unit - diluted: Income from continuing operations attributable to the Partnership’s common unitholders $ 0.44 $ 0.51 $ 0.85 $ 0.25 Net income attributable to the Partnership’s common unitholders $ 0.44 $ 0.51 $ 0.85 $ 0.25 Weighted average common units outstanding - basic 153,329 153,377 153,337 153,408 Weighted average common units outstanding - diluted 153,537 153,705 153,769 153,893

Business Segments - (Tables)

Business Segments - (Tables)	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Summary information for the reportable segments	the years ended December 31, 2015 , 2014 and 2013 (in thousands): Conventional Real Estate Operations Affordable Real Estate Operations Proportionate Adjustments (1) Corporate and Amounts Not Allocated to Segments (2) Consolidated Year Ended December 31, 2015: Rental and other property revenues (3) $ 798,321 $ 96,549 $ 37,369 $ 24,715 $ 956,954 Tax credit and asset management revenues — — — 24,356 24,356 Total revenues 798,321 96,549 37,369 49,071 981,310 Property operating expenses (3) 263,573 38,484 13,815 43,521 359,393 Investment management expenses — — — 5,855 5,855 Depreciation and amortization (3) — — — 306,301 306,301 General and administrative expenses — — — 43,178 43,178 Other expenses, net — — — 10,368 10,368 Total operating expenses 263,573 38,484 13,815 409,223 725,095 Operating income (loss) 534,748 58,065 23,554 (360,152 ) 256,215 Other items included in continuing operations — — — (164,825 ) (164,825 ) Income (loss) from continuing operations $ 534,748 $ 58,065 $ 23,554 $ (524,977 ) $ 91,390 Conventional Real Estate Operations Affordable Real Estate Operations Proportionate Adjustments (1) Corporate and Amounts Not Allocated to Segments (2) Consolidated Year Ended December 31, 2014: Rental and other property revenues (3) $ 729,657 $ 94,501 $ 29,564 $ 99,109 $ 952,831 Tax credit and asset management revenues — — — 31,532 31,532 Total revenues 729,657 94,501 29,564 130,641 984,363 Property operating expenses (3) 245,264 38,407 8,878 81,105 373,654 Investment management expenses — — — 7,310 7,310 Depreciation and amortization (3) — — — 282,608 282,608 Provision for real estate impairment losses (3) — — — 1,820 1,820 General and administrative expenses — — — 44,092 44,092 Other expenses, net — — — 12,529 12,529 Total operating expenses 245,264 38,407 8,878 429,464 722,013 Operating income (loss) 484,393 56,094 20,686 (298,823 ) 262,350 Other items included in continuing operations — — — (194,875 ) (194,875 ) Income (loss) from continuing operations $ 484,393 $ 56,094 $ 20,686 $ (493,698 ) $ 67,475 Conventional Real Estate Operations Affordable Real Estate Operations Proportionate Adjustments (1) Corporate and Amounts Not Allocated to Segments (2) Consolidated Year Ended December 31, 2013: Rental and other property revenues (3) $ 679,422 $ 93,033 $ 66,489 $ 100,287 $ 939,231 Tax credit and asset management revenues — — — 34,822 34,822 Total revenues 679,422 93,033 66,489 135,109 974,053 Property operating expenses (3) 233,183 37,433 25,192 79,902 375,710 Investment management expenses — — — 4,341 4,341 Depreciation and amortization (3) — — — 291,910 291,910 General and administrative expenses — — — 45,670 45,670 Other expenses, net — — — 7,403 7,403 Total operating expenses 233,183 37,433 25,192 429,226 725,034 Operating income (loss) 446,239 55,600 41,297 (294,117 ) 249,019 Other items included in continuing operations — — — (214,423 ) (214,423 ) Income (loss) from continuing operations $ 446,239 $ 55,600 $ 41,297 $ (508,540 ) $ 34,596 (1) Represents adjustments for the noncontrolling interests in consolidated real estate partnerships’ share of the results of our consolidated apartment communities and the results of consolidated apartment communities that we do not manage, which are excluded from our measurement of segment performance but included in the related consolidated amounts, and our share of the results of operations of our unconsolidated real estate partnerships that we manage, which are included in our measurement of segment performance but excluded from the related consolidated amounts. (2) Our basis for assessing segment performance excludes the results of apartment communities sold or classified as held for sale. As discussed in Note 2 , effective January 1, 2014, we adopted ASU 2014-08, which revised the definition of a discontinued operation. In the segment presentation above, the current year and prior years' operating results for apartment communities sold or classified as held for sale during the years ended December 31, 2015 and 2014 , are presented within the Corporate and Amounts Not Allocated to Segments column. The operating results for the year ended December 31, 2013 , for apartment communities sold through December 31, 2013, are presented within discontinued operations and are accordingly excluded from the segment presentation above. (3) Proportionate property net operating income, our key measurement of segment profit or loss excludes property management revenues (which are included in rental and other property revenues), property management expenses and casualty gains and losses (which are included in property operating expenses), depreciation and amortization and provision for real estate impairment losses. Accordingly, we do not allocate these amounts to our segments.
Assets of reportable segments	The assets of our reportable segments on a proportionate basis, together with the proportionate adjustments to reconcile these amounts to the consolidated assets of our segments, and the consolidated assets not allocated to our segments are as follows (in thousands): December 31, 2015 2014 Conventional $ 5,107,059 $ 4,841,402 Affordable 421,932 439,488 Proportionate adjustments (1) 175,042 179,323 Corporate and other assets (2) 440,161 636,815 Total consolidated assets $ 6,144,194 $ 6,097,028 (1) Represents adjustments for the noncontrolling interests in consolidated real estate partnerships’ share of the assets of our consolidated apartment communities, which are excluded from our measurement of segment financial condition, and our share of the assets of our unconsolidated real estate partnerships, which are included in our measure of segment financial condition. (2) Our basis for assessing segment performance excludes the results of apartment communities sold or classified as held for sale, therefore, assets related to apartment communities sold or classified as held for sale during the periods are included within Corporate and other assets for comparative periods presented.

Organization - (Details)

Organization - (Details)	12 Months Ended
	Dec. 31, 2015UnitsPropertyshares	Dec. 31, 2014shares
Organization
Common partnership units and equivalents outstanding | shares	156,326,416
Shares of common stock outstanding | shares	156,326,416	146,403,274
Aimco's ownership interest in AIMCO Properties, L.P.	95.20%
Affordable Real Estate Operations [Member]
Organization
Number of apartment communities | Property	56
Number of apartment homes | Units	8,685
Percentage of proportionate property net operating income generated by segment	10.00%
Conventional Real Estate Operations [Member]
Organization
Number of apartment communities | Property	140
Number of apartment homes | Units	40,464
Percentage of proportionate property net operating income generated by segment	90.00%
Wholly and Partially Owned And Consolidated Properties [Member] | Affordable Real Estate Operations [Member]
Organization
Number of apartment communities | Property	49
Number of apartment homes | Units	7,998
Wholly and Partially Owned And Consolidated Properties [Member] | Conventional Real Estate Operations [Member]
Organization
Number of apartment communities | Property	136
Number of apartment homes | Units	40,322
AIMCO PROPERTIES, L.P.
Organization
Common partnership units and equivalents outstanding | shares	164,179,533

Basis of Presentation and Sum42

Basis of Presentation and Summary of Significant Accounting Policies - Principles of Consolidation (Details) $ in Thousands	Dec. 31, 2015USD ($)UnitsPropertyEntity	Dec. 31, 2014USD ($)
Variable Interest Entity [Line Items]
Real estate, net	$ 5,529,461	$ 5,472,779
Non-recourse property debt	$ 3,846,160	$ 4,022,809
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Number Of Variable Interest Entities | Entity	61
Number of apartment communities | Property	47
Number of apartment homes | Units	7,459
Real estate, net	$ 335,100
Non-recourse property debt	$ 325,200

Basis of Presentation and Sum43

Basis of Presentation and Summary of Significant Accounting Policies - Acquisition of Real Estate Assets and Related Depreciation and Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Below Market Lease, Net	$ 12,100	$ 13,800
Below Market Lease, Accumulated Amortization	31,400	29,700
Amortization of Below Market Lease	1,700	1,300	$ 2,900
Below Market Leases Written Off To Gain Loss Upon Sale		$ 1,800
Schedule of expected amortization of below market obligations related to acquired leases
2,016	(1,337)
2,017	(1,239)
2,018	(1,095)
2,019	(1,007)
2,020	$ (915)
Leases, Acquired-in-Place, Market Adjustment [Member]
Property, Plant and Equipment [Line Items]
Weighted average amortization period of below market leases	6 years 8 months

Basis of Presentation and Sum44

Basis of Presentation and Summary of Significant Accounting Policies - Capital Additions and Related Depreciation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Interest Costs Capitalized	$ 11.7	$ 14.2	$ 17.6
Other Direct And Indirect Costs Capitalized	$ 28.2	$ 29.2	$ 33.2
Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Middle [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	15 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Building and Building Improvements [Member] | Weighted Average [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	30 years

Basis of Presentation and Sum45

Basis of Presentation and Summary of Significant Accounting Policies - Impairment of Long-Lived Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Asset Impairment Charges [Abstract]
Provision for real estate impairment losses	$ 0	$ 1,820	$ 0

Basis of Presentation and Sum46

Basis of Presentation and Summary of Significant Accounting Policies - Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Assets [Abstract]
Deferred financing costs, net	$ 26,126	$ 30,320
Investments in unconsolidated real estate partnerships	15,401	16,046
Investments in securitization trust that holds Aimco property debt	65,502	61,043
Intangible assets, net	45,447	49,441
Deferred tax asset, net (Note 8)	26,117	252
Assets related to the legacy asset management business (Note 3)	156,389	161,135
Prepaid expenses, accounts and notes receivable, deposits and other	138,936	158,490
Other assets per consolidated balance sheets	$ 473,918	$ 476,727

Basis of Presentation and Sum47

Basis of Presentation and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Combination, Goodwill [Abstract]
Goodwill	$ 43.9	$ 45.1
Goodwill, Written off Related to Sale of Business Unit	$ 1.2	$ 3.9	$ 5.5

Basis of Presentation and Sum48

Basis of Presentation and Summary of Significant Accounting Policies - Capitalized Software Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Capitalized Computer Software, Net [Abstract]
Capitalized Software, Estimated Useful Life	5 years
Capitalized Computer Software, Additions	$ 3.6	$ 4.4	$ 3.3
Capitalized Computer Software, Net	16.4	19.7
Capitalized Computer Software, Amortization	$ 6.9	$ 6.7	$ 8.9

Basis of Presentation and Sum49

Basis of Presentation and Summary of Significant Accounting Policies - Noncontrolling Interests in Consolidated Real Estate Partnerships (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Noncontrolling Interest [Line Items]
Noncontrolling interests in consolidated real estate partnerships	$ (151,365)	$ (233,296)
Napico Portfolio [Member]
Noncontrolling Interest [Line Items]
Noncontrolling interests in consolidated real estate partnerships	$ (111)	$ (44,106)

Basis of Presentation and Sum50

Basis of Presentation and Summary of Significant Accounting Policies - Noncontrolling Interests in Aimco Operating Partnership (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Noncontrolling Interests in Aimco Operating Partnership [Abstract]
Weighted Average Ownership Percentage in the Aimco Operating Partnership by holders of OP Units	4.70%	5.00%	5.20%

Basis of Presentation and Sum51

Basis of Presentation and Summary of Significant Accounting Policies - Revenue Recognition (Details)	12 Months Ended
	Dec. 31, 2015
Revenue Recognition [Abstract]
Average Term of Operating Leases with Apartment Residents	12 months

Basis of Presentation and Sum52

Basis of Presentation and Summary of Significant Accounting Policies - Tax Credit Arrangements (Details)	12 Months Ended
	Dec. 31, 2015
Tax Credit Arrangements [Abstract]
Period Of Time Over Which Low Income Housing Tax Credits Realized By Investors	10 years
Typical Compliance Period Related To Low Income Housing Tax Credit Arrangements	15 years
General Partner Interests In Low Income Housing Tax Credit Partnerships Held By Aimco	one percent or less
Limited Partner Interests In Low Income Housing Tax Credit Partnerships Held By Unaffiliated Investors	at least 99%

Basis of Presentation and Sum53

Basis of Presentation and Summary of Significant Accounting Policies - Income Taxes (Details)	Dec. 31, 2015
Income Taxes [Abstract]
Percentage of income tax on income from non-arms length transactions	100.00%

Significant Transactions - Acq

Significant Transactions - Acquisitions of Apartment Communities (Details) - Series of Individually Immaterial Business Acquisitions [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)Property	Dec. 31, 2014USD ($)Property
Business Combination [Line Items]
Number of apartment communities | Property	3	6
Number of apartment homes | Property	300	1,182
Acquisition price	$ 129,150	$ 291,925
Non-recourse property debt assumed (outstanding principal balance)	0	65,200
Non-recourse property debt assumed (fair value)	0	64,817
Total fair value allocated to land	10,742	70,961
Total fair value allocated to buildings and improvements	$ 118,366	$ 217,851

Significant Transactions - A55

Significant Transactions - Acquisitions of Apartment Communities (Details 1)	Dec. 31, 2014a
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Area of Land Acquired	2.4

Significant Transactions - Ass

Significant Transactions - Asset Management Business Disposition (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2015USD ($)	Dec. 31, 2015USD ($)Property	Dec. 31, 2014USD ($)Property	Dec. 31, 2013USD ($)Property
Significant Acquisitions and Disposals [Line Items]
Distributions to noncontrolling interests | $		$ 89,371	$ 43,914	$ 59,946
Napico Portfolio [Member]
Significant Acquisitions and Disposals [Line Items]
Distributions to noncontrolling interests | $	$ 38,900
Number of partnerships in legally sold portfolio		14
Derecognition Of Remaining Noncontrolling Interest Balances Resulting In Adjustment To Net Income Attributable To Parent | $				$ 20,600
Unconsolidated Properties [Member]
Significant Acquisitions and Disposals [Line Items]
Number of apartment communities | Property		11	11	20
Unconsolidated Properties [Member] | Napico Portfolio [Member]
Significant Acquisitions and Disposals [Line Items]
Number of apartment communities | Property		44
Wholly and Partially Owned And Consolidated Properties [Member] | Napico Portfolio [Member]
Significant Acquisitions and Disposals [Line Items]
Number of apartment communities | Property		12

Significant Transactions - A57

Significant Transactions - Asset Management Business Disposition (Details 1) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Significant Acquisitions and Disposals [Line Items]
Real estate, net	$ 5,529,461	$ 5,472,779
Cash and cash equivalents	50,789	28,971	$ 55,751	$ 84,413
Other assets	473,918	476,727
Total assets	6,144,194	6,097,028
Total indebtedness	3,873,160	4,135,139
Accrued and other liabilities	318,975	279,077
Total liabilities	4,292,363	4,566,986
Noncontrolling interests in consolidated real estate partnerships	151,365	233,296
Equity attributable to Aimco and the Aimco Operating Partnership	(9,851)	(18,926)
Total liabilities and equity	6,144,194	6,097,028
Napico Portfolio [Member]
Significant Acquisitions and Disposals [Line Items]
Noncontrolling interests in consolidated real estate partnerships	111	44,106
Equity attributable to Aimco and the Aimco Operating Partnership	684	(1,029)
Total liabilities and equity	156,389	161,135
Napico Portfolio [Member] | Other Assets [Member]
Significant Acquisitions and Disposals [Line Items]
Real estate, net	108,119	117,851
Cash and cash equivalents	33,725	23,133
Other assets	14,545	20,151
Total assets	156,389	161,135
Napico Portfolio [Member] | Accrued liabilities and other [Member]
Significant Acquisitions and Disposals [Line Items]
Total indebtedness	148,761	113,641
Accrued and other liabilities	7,055	4,417
Total liabilities	$ 155,816	$ 118,058

Significant Transactions - A58

Significant Transactions - Asset Management Business Disposition (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Significant Acquisitions and Disposals [Line Items]
Revenues	$ 245,875	$ 246,387	$ 244,783	$ 244,265	$ 242,178	$ 246,843	$ 246,418	$ 248,924	$ 981,310	$ 984,363	$ 974,053
Expenses	$ (180,391)	$ (182,366)	$ (179,140)	$ (183,198)	$ (178,370)	$ (179,376)	$ (180,621)	$ (183,646)	(725,095)	(722,013)	(725,034)
Equity in earnings or loss of unconsolidated entities, gains or losses on dispositions and other, net									387	(829)	2,723
Continuing operations									27,524	20,047	1,959
Net income attributable to noncontrolling interests in consolidated real estate partnerships									(4,776)	(24,595)	(12,473)
Net income (loss) attributable to the company's common equity holders									248,710	309,249	207,290
Napico Portfolio [Member]
Significant Acquisitions and Disposals [Line Items]
Continuing operations									(1,967)	3	(639)
Net income attributable to noncontrolling interests in consolidated real estate partnerships									5,420	(403)	21,370
Net income (loss) attributable to the company's common equity holders									3,641	(1,167)	22,506
Napico Portfolio [Member] | Other Nonoperating Income (Expense) [Member]
Significant Acquisitions and Disposals [Line Items]
Revenues									26,203	27,701	23,711
Expenses									(21,520)	(21,472)	(21,188)
Equity in earnings or loss of unconsolidated entities, gains or losses on dispositions and other, net									(4,495)	(6,996)	(748)
Net income (loss) related to legacy asset management business									$ 188	$ (767)	$ 1,775

Investments in Unconsolidated59

Investments in Unconsolidated Real Estate Partnerships - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financial information for the unconsolidated real estate partnerships
Total assets	$ 84,796	$ 85,492	$ 93,242
Total liabilities	52,685	54,472	64,859
Partners’ capital	32,111	31,020	28,383
Rental and other property revenues	12,193	12,978	16,268
Property operating expenses	(5,473)	(6,233)	(8,470)
Depreciation and amortization	(1,841)	(3,081)	(3,300)
Interest expense	(2,520)	(2,785)	(4,185)
Gain on sale and impairment losses, net	0	0	36,212
Net income	$ 1,720	$ 688	$ 35,909

Investments in Unconsolidated60

Investments in Unconsolidated Real Estate Partnerships - (Details 1) $ in Millions	Dec. 31, 2015USD ($)Property	Dec. 31, 2014USD ($)Property	Dec. 31, 2013Property
Schedule of Equity Method Investments [Line Items]
Aggregate investment in unconsolidated partnerships	$ 15.4	$ 16
Excess of equity method investment aggregate cost over share of underlying historical partners deficit	$ (0.8)	$ 0.4
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Range of ownership interests in unconsolidated real estate partnerships	67.00%
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Range of ownership interests in unconsolidated real estate partnerships	40.00%
Unconsolidated Properties [Member]
Schedule of Equity Method Investments [Line Items]
Number of apartment communities | Property	11	11	20

Non-Recourse Property Debt an61

Non-Recourse Property Debt and Credit Agreement - (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Non-recourse property debt	$ 3,846,160	$ 4,022,809
Fixed Rate
Debt Instrument [Line Items]
Non-recourse property debt	3,761,238	3,902,642
Variable Rate
Debt Instrument [Line Items]
Non-recourse property debt	$ 84,922	$ 120,167

Non-Recourse Property Debt an62

Non-Recourse Property Debt and Credit Agreement - (Details 1) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Scheduled principal amortization and maturity payments
Amortization, 2016	$ 76,798
Amortization, 2017	75,472
Amortization, 2018	73,698
Amortization, 2019	68,418
Amortization, 2020	61,731
Maturities, 2016	249,175
Maturities, 2017	325,853
Maturities, 2018	207,616
Maturities, 2019	518,323
Maturities, 2020	303,741
Total Amortization and Maturities, 2016	325,973
Total Amortization and Maturities, 2017	401,325
Total Amortization and Maturities, 2018	281,314
Total Amortization and Maturities, 2019	586,741
Total Amortization and Maturities, 2020	365,472
Total Amortization and Maturities, Thereafter	1,885,335
Principal outstanding	$ 3,846,160	$ 4,022,809

Non-Recourse Property Debt an63

Non-Recourse Property Debt and Credit Agreement - (Details 2) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)Property	Dec. 31, 2014USD ($)
Non-Recourse Property Debt (Textual) [Abstract]
Estimated Fair Value Of Unencumbered Real Estate	$ 1,800,000
Credit Agreement
Revolving loan commitments	$ 600,000
Initial interest rate for credit facility	LIBOR, plus 1.35%, or, at our option, Prime plus 0.35%
Credit facility maturity date	Sep. 1, 2017
Credit Facility Extension option	an additional one-year period
Line of 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
Revolving credit facility borrowings	$ 27,000	$ 112,330
Remaining borrowing capacity under credit facility	536,600
Amount outstanding for undrawn letters of credit issued under revolving credit facility	$ 36,400
Line of Credit Facility, Interest Rate at Period End	1.59%	2.08%
Fixed Rate
Non-Recourse Property Debt (Textual) [Abstract]
Debt Instrument, Maximum Maturity Date	Feb. 28, 2061
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	2.28%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	8.50%
Debt, Weighted Average Interest Rate	5.10%
Debt Instrument, Collateral Amount	$ 6,707,000
Variable Rate
Non-Recourse Property Debt (Textual) [Abstract]
Debt Instrument, Maximum Maturity Date	Jul. 31, 2033
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	0.05%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	1.86%
Debt, Weighted Average Interest Rate	1.55%
Debt Instrument, Collateral Amount	$ 165,800
Unencumbered Real Estate Property [Member]
Non-Recourse Property Debt (Textual) [Abstract]
Number of apartment communities | Property	25
Pledged as collateral [Member] | Fixed Rate
Non-Recourse Property Debt (Textual) [Abstract]
Number of apartment communities | Property	153
Pledged as collateral [Member] | Variable Rate
Non-Recourse Property Debt (Textual) [Abstract]
Number of apartment communities | Property	4

Fair Value Measurements - (Det

Fair Value Measurements - (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value of Assets and Liabilities Measured on a Recurring Basis [Roll Forward]
Fair Value, Beginning Balance	$ 55,770	$ 53,804
Investment accretion	(4,245)	(3,827)
Unrealized losses included in interest expense	(44)	(48)
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss	1,678	1,685
Unrealized losses included in equity and partners’ capital	(1,085)	(3,498)
Fair Value, Ending Balance	60,564	55,770
Available-for-sale Securities [Member]
Fair Value of Assets and Liabilities Measured on a Recurring Basis [Roll Forward]
Fair Value, Beginning Balance	61,043	58,408
Investment accretion	(4,245)	(3,827)
Unrealized losses included in equity and partners’ capital	214	(1,192)
Fair Value, Ending Balance	65,502	61,043
Interest Rate Swap [Member]
Fair Value of Assets and Liabilities Measured on a Recurring Basis [Roll Forward]
Fair Value, Beginning Balance	(5,273)	(4,604)
Unrealized losses included in interest expense	(44)	(48)
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss	1,678	1,685
Unrealized losses included in equity and partners’ capital	(1,299)	(2,306)
Fair Value, Ending Balance	$ (4,938)	$ (5,273)

Fair Value Measurements - (D65

Fair Value Measurements - (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of consolidated debt	$ 4,000,000	$ 4,400,000
Total indebtedness	3,873,160	4,135,139
Cash Flow Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Swap Notional Amount	$ 49,900	50,300
Weighted Average Remaining Term of interest Rate Swaps	5 years
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 1,700
Weighted average fixed receive rate under total rate of return swaps	3.43%
Available-for-sale Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Face Value	$ 100,900
Excepted Remaining Term Available For Sale Securities	5 years 5 months
Amortized cost of the investment in securities	$ 67,800	$ 63,600

Commitments and Contingencies66

Commitments and Contingencies - (Details) $ in Thousands	Dec. 31, 2015USD ($)
Approximate minimum annual rentals under operating lease obligations
Operating Lease Obligations, 2016	$ 3,856
Operating Lease Obligations, 2017	3,256
Operating Lease Obligations, 2018	2,057
Operating Lease Obligations, 2019	1,321
Operating Lease Obligations, 2020	1,484
Operating Leases, Due Thereafter	67,876
Operating Lease Obligations, Total	79,850
Ground Leases [Member]
Approximate minimum annual rentals under operating lease obligations
Operating Lease Obligations, 2016	795
Operating Lease Obligations, 2017	895
Operating Lease Obligations, 2018	995
Operating Lease Obligations, 2019	1,095
Operating Lease Obligations, 2020	1,331
Operating Leases, Due Thereafter	67,876
Operating Lease Obligations, Total	72,987
Office and Equipment Leases [Member]
Approximate minimum annual rentals under operating lease obligations
Operating Lease Obligations, 2016	3,061
Operating Lease Obligations, 2017	2,361
Operating Lease Obligations, 2018	1,062
Operating Lease Obligations, 2019	226
Operating Lease Obligations, 2020	153
Operating Leases, Due Thereafter	0
Operating Lease Obligations, Total	$ 6,863

Commitments and Contingencies67

Commitments and Contingencies - (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies [Abstract]
Contract to purchase aparatment community currently under construction	$ 320
Payment deposits for purchase of apartment community under construction	25
Commitments related to development, redevelopment and capital improvement activities [Member]
Commitments and Contingencies [Abstract]
Commitments related to capital spending activities	110
Borrowing capacity under construction loan	114
Undrawn portion of long term construction loans	$ 27.8
Minimum [Member]
Commitments and Contingencies [Abstract]
Compliance Period For Low Income Housing Tax Credit Syndication Agreements	1 year
Minimum [Member] | Commitments related to development, redevelopment and capital improvement activities [Member]
Commitments and Contingencies [Abstract]
Long-term Purchase Commitment, Period	1 year
Maximum [Member]
Commitments and Contingencies [Abstract]
Compliance Period For Low Income Housing Tax Credit Syndication Agreements	10 years
Maximum [Member] | Commitments related to operations [Member]
Commitments and Contingencies [Abstract]
Long-term Purchase Commitment, Period	1 year
Office and Equipment Leases [Member]
Commitments and Contingencies [Abstract]
Rent expense	$ 3.2	$ 3.3	$ 4.2
Ground Leases [Member]
Commitments and Contingencies [Abstract]
Rent expense	$ 0.9	$ 1	$ 0.9
Ground Leases [Member] | Minimum [Member]
Commitments and Contingencies [Abstract]
Lessee Leasing Arrangements, Operating Leases, Term of Contract	33 years
Ground Leases [Member] | Maximum [Member]
Commitments and Contingencies [Abstract]
Lessee Leasing Arrangements, Operating Leases, Term of Contract	69 years

Income Taxes - (Details)

Income Taxes - (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax liabilities:
Real estate and real estate partnership basis differences	$ 31,726	$ 38,231
Deferred tax assets:
Net operating, capital and other loss carryforwards	8,024	6,699
Accruals and expenses	4,917	5,430
Tax credit carryforwards	49,036	29,714
Management contracts and other	333	267
Total deferred tax assets	62,310	42,110
Valuation allowance	(4,467)	(3,627)
Net deferred income tax assets	$ 26,117	$ 252

Income Taxes - (Details 1)

Income Taxes - (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of unrecognized tax benefits
Balance at January 1	$ 2,286	$ 2,871	$ 3,536
Reductions as a result of a lapse of the applicable statutes	0	0	(764)
Additions (reductions) based on tax positions related to prior years and current year excess benefits related to stock-based compensation	611	(585)	99
Balance at December 31	$ 2,897	$ 2,286	$ 2,871

Income Taxes - (Details 2)

Income Taxes - (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 1,310	$ 0	$ 0
State	1,357	970	63
Total current	2,667	970	63
Deferred:
Federal	(27,382)	11,556	7,621
State	(1,052)	3,485	1,685
Total deferred	(28,434)	15,041	9,306
Total (benefit) expense	(25,767)	16,011	9,369
Classification:
Continuing operations	(27,524)	(20,047)	(1,959)
Discontinued operations	0	0	11,328
Gain on dispositions of real estate	$ 1,757	$ 36,058	$ 0

Income Taxes - (Details 3)

Income Taxes - (Details 3) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of income tax attributable to continuing and discontinued operations
Tax at United States statutory rates on consolidated income or loss subject to tax		$ (10,947)	$ 47,950	$ 16,326
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		$ (361)	$ 4,364	$ 1,748
State income tax expense (benefit), net of Federal tax (benefit), percentage		1.20%	3.20%	3.70%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount		$ (27)	$ (154)	$ (296)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent		0.10%	(0.10%)	(0.60%)
Tax effect of intercompany transfers of assets between the REIT and TRS entities (1)	[1]	$ (1,515)	$ (23,969)	$ (4,272)
Tax effect of intercompany transfers of assets between the REIT and taxable REIT subsidiaries, percentage (1)	[1]	4.80%	(17.50%)	(9.20%)
Tax credits		$ (13,583)	$ (12,271)	$ (4,137)
Tax credits, percentage		43.40%	(9.00%)	(8.90%)
Increase in valuation allowance		$ 666	$ 91	$ 0
Increase in valuation allowance, percentage		(2.10%)	0.10%	0.00%
Total (benefit) expense		$ (25,767)	$ 16,011	$ 9,369
Reconciliation of income tax, percentage		82.40%	11.70%	20.00%
[1]	Includes the effect of intercompany asset transfers between the Aimco Operating Partnership and TRS entities, for which tax is deferred and recognized as the assets affect GAAP income or loss, for example, through depreciation, impairment, or upon the sale of the asset to a third party.

Income Taxes - (Details 4)

Income Taxes - (Details 4) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends paid to holders of common stock
Ordinary income	$ 0.36	$ 0.01	$ 0.17
Ordinary income, percentage	30.20%	0.60%	17.90%
Capital gains	$ 0.37	$ 0.53	$ 0.13
Capital gains, percentage	31.30%	51.60%	13.90%
Qualified dividends	$ 0.17	$ 0	$ 0
Qualified dividends, percentage	14.50%	0.00%	0.00%
Unrecaptured Section 1250 gain	$ 0.28	$ 0.50	$ 0.66
Unrecaptured Section 1250 gain, percentage	24.00%	47.80%	68.20%
Dividends declared per common share/unit	$ 1.18	$ 1.04	$ 0.96
Dividends declared per common share, percentage	100.00%	100.00%	100.00%

Income Taxes - (Details 5)

Income Taxes - (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ 800
Income Taxes (Textual) [Abstract]
Portion of unrecognized tax benefit that, if recognized, would impact the effective tax rate	2,300
Excess tax benefits recognized related to employee stock option exercises and vested restricted stock awards	1,600
Consolidated income (loss) subject to tax	(31,300)	$ 137,000	$ 46,600
Cash paid for income taxes	2,033	$ 1,657	$ 629
Operating loss carryforwards	8,000
Net deferred tax asset related to tax credit carryforwards	49,500
Net deferred tax asset related to credits	49,000
Operating Loss Carryforwards, Valuation Allowance	$ 4,500
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Expiration years of net operating loss carryforwards	Dec. 31, 2018
Tax Credit Carryforward, Expiration Date	Dec. 31, 2024
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Expiration years of net operating loss carryforwards	Dec. 31, 2032
Tax Credit Carryforward, Expiration Date	Dec. 31, 2033

Aimco Equity - (Details)

Aimco Equity - (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Classes of perpetual preferred stock
Perpetual Preferred Stock (Note 9)		$ 159,126	$ 186,126
Class A Cumulative Preferred Stock [Member]
Classes of perpetual preferred stock
Redemption Date	[1]	May 17, 2019
Annual per share dividend rate (Paid quarterly)		6.88%
Perpetual Preferred Stock (Note 9)		$ 125,000	$ 125,000
Shares of preferred stock authorized		5,000,000	5,000,000
Shares of preferred stock issued		5,000,000	5,000,000
Shares of preferred stock outstanding		5,000,000	5,000,000
Preferred Stock, Liquidation Preference Per Share		$ 25	$ 25
Series A Community Reinvestment Act Preferred Stock [Member]
Classes of perpetual preferred stock
Redemption Date	[1]	Jun. 30, 2011
Annual per share dividend rate (Paid quarterly)			1.48%
Perpetual Preferred Stock (Note 9)		$ 0	$ 27,000
Shares of preferred stock authorized		0	240
Shares of preferred stock issued		0	54
Shares of preferred stock outstanding		0	54
Dividend rate			1.25%
Class Z Cumulative Preferred Stock [Member]
Classes of perpetual preferred stock
Redemption Date	[1]	Jul. 29, 2016
Annual per share dividend rate (Paid quarterly)		7.00%
Perpetual Preferred Stock (Note 9)		$ 34,126	$ 34,126
Shares of preferred stock authorized		4,800,000	4,800,000
Shares of preferred stock issued		1,391,643	1,391,643
Shares of preferred stock outstanding		1,391,643	1,391,643
Preferred Stock, Liquidation Preference Per Share		$ 25	$ 25
[1]	All classes of preferred stock are or were redeemable at our option on and after the dates specified.

Aimco Equity - (Details 1)

Aimco Equity - (Details 1) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Issuances of Preferred Stock [Abstract]
Net proceeds to Aimco	$ 0	$ 123,551	$ 0
Class A Cumulative Preferred Stock [Member]
Issuances of Preferred Stock [Abstract]
Number of shares of stock issued		5,000,000
Price to public per share		$ 25
Underwriting discounts, commissions and transaction costs per share		0.85
Net proceeds per share		$ 24.15
Net proceeds to Aimco		$ 120,757
Issuance costs (primarily underwriting commissions) recognized as an adjustment of additional paid-in capital		$ 4,350
Class Z Cumulative Preferred Stock [Member]
Issuances of Preferred Stock [Abstract]
Number of shares of stock issued		117,400
Price to public per share		$ 25.65
Underwriting discounts, commissions and transaction costs per share		0.51
Net proceeds per share		$ 25.14
Net proceeds to Aimco		$ 2,901
Issuance costs (primarily underwriting commissions) recognized as an adjustment of additional paid-in capital		$ 110

Aimco Equity - (Details 2)

Aimco Equity - (Details 2) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Per share par value of preferred stock issued	$ 0.01
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Proceeds from Issuance of Common Stock	$ 366,580	$ 0	$ 0
Class A Cumulative Preferred Stock [Member]
Class of Stock [Line Items]
Dividend rate of preferred stock issued	6.88%
Gross Offering Price Per Share Of Stock Issued		$ 25
Preferred stock, liquidation preference per share	$ 25	$ 25
Number of shares of stock issued		5,000,000
Net proceeds per share of stock issued		$ 24.15
Class Z Cumulative Preferred Stock [Member]
Class of Stock [Line Items]
Dividend rate of preferred stock issued	7.00%
Gross Offering Price Per Share Of Stock Issued		25.65
Preferred stock, liquidation preference per share	$ 25	$ 25
Number of shares of stock issued		117,400
Net proceeds per share of stock issued		$ 25.14
Series A Community Reinvestment Act Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock dividend description	variable rate per annum equal to the Three-Month LIBOR Rate (as defined in the articles supplementary designating the Series A Community Reinvestment Act Perpetual Preferred Stock, or CRA Preferred Stock) plus 1.25%, calculated as of the beginning of each quarterly dividend period
Dividend rate of preferred stock issued		1.48%
Shares of preferred stock redeemed during period		20
Preferred Stock, Redemption Amount	$ 27,000	$ 10,000
Preferred stock redeemed during period at redemption value		9,500
Preferred Stock Redemption Discount		500
Previously deferred issuance costs reflected as an adjustment of net income attributable to preferred security holders	$ 700	$ 300
Class A Common Stock [Member]
Class of Stock [Line Items]
Gross Offering Price Per Share Of Stock Issued	$ 38.90
Number of shares of stock issued	9,430,000
Common Stock, par value (in dollars per share)	$ 0.01
Proceeds from Issuance of Common Stock	$ 366,580
Shares available for issuance under at-the-market offering programs	3,500,000

Partners Capital - (Details)

Partners Capital - (Details) - AIMCO PROPERTIES, L.P. - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Limited Partners' Capital Account [Line Items]
Perpetual Partnership Preferred Units issued	3,277,878	3,278,539
Perpetual Partnership Preferred Units outstanding	3,277,878	3,278,539
Perpetual Partnership Preferred Units, Redemption Value	$ 87,926	$ 87,943
Class One [Member]
Limited Partners' Capital Account [Line Items]
Per Annum Distribution Rate	8.75%
Distribution Made to Limited Partner, Distributions Paid, Per Unit	$ 8
Perpetual Partnership Preferred Units issued	90,000	90,000
Perpetual Partnership Preferred Units outstanding	90,000	90,000
Perpetual Partnership Preferred Units, Redemption Value	$ 8,229	$ 8,229
Class Two [Member]
Limited Partners' Capital Account [Line Items]
Per Annum Distribution Rate	1.92%
Distribution Made to Limited Partner, Distributions Paid, Per Unit	$ 0.46
Perpetual Partnership Preferred Units issued	18,124	18,589
Perpetual Partnership Preferred Units outstanding	18,124	18,589
Perpetual Partnership Preferred Units, Redemption Value	$ 453	$ 465
Class Three [Member]
Limited Partners' Capital Account [Line Items]
Per Annum Distribution Rate	7.88%
Distribution Made to Limited Partner, Distributions Paid, Per Unit	$ 1.97
Perpetual Partnership Preferred Units issued	1,341,289	1,341,485
Perpetual Partnership Preferred Units outstanding	1,341,289	1,341,485
Perpetual Partnership Preferred Units, Redemption Value	$ 33,532	$ 33,537
Class Four [Member]
Limited Partners' Capital Account [Line Items]
Per Annum Distribution Rate	8.00%
Distribution Made to Limited Partner, Distributions Paid, Per Unit	$ 2
Perpetual Partnership Preferred Units issued	644,954	644,954
Perpetual Partnership Preferred Units outstanding	644,954	644,954
Perpetual Partnership Preferred Units, Redemption Value	$ 16,124	$ 16,124
Class Six [Member]
Limited Partners' Capital Account [Line Items]
Per Annum Distribution Rate	8.50%
Distribution Made to Limited Partner, Distributions Paid, Per Unit	$ 2.13
Perpetual Partnership Preferred Units issued	790,883	790,883
Perpetual Partnership Preferred Units outstanding	790,883	790,883
Perpetual Partnership Preferred Units, Redemption Value	$ 19,772	$ 19,772
Class Seven [Member]
Limited Partners' Capital Account [Line Items]
Per Annum Distribution Rate	7.87%
Distribution Made to Limited Partner, Distributions Paid, Per Unit	$ 1.97
Perpetual Partnership Preferred Units issued	27,960	27,960
Perpetual Partnership Preferred Units outstanding	27,960	27,960
Perpetual Partnership Preferred Units, Redemption Value	$ 699	$ 699
Class Nine [Member]
Limited Partners' Capital Account [Line Items]
Per Annum Distribution Rate	6.00%
Distribution Made to Limited Partner, Distributions Paid, Per Unit	$ 1.50
Perpetual Partnership Preferred Units issued	364,668	364,668
Perpetual Partnership Preferred Units outstanding	364,668	364,668
Perpetual Partnership Preferred Units, Redemption Value	$ 9,117	$ 9,117

Partners Capital - (Details 1)

Partners Capital - (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at January 1	$ 87,937
Balance at January 1	87,926	$ 87,937
AIMCO PROPERTIES, L.P.
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at January 1	87,937	79,953	$ 80,046
Preferred distributions	(6,943)	(6,409)	(6,423)
Redemption of preferred units and other	(11)	(1,221)	(93)
Partners Capital Account Issuance Of Preferred Units To Parent	0	9,117	0
Net income attributable to preferred noncontrolling interests in Aimco Operating Partnership	6,943	6,497	6,423
Balance at January 1	$ 87,926	$ 87,937	$ 79,953

Partners Capital - (Details 2)

Partners Capital - (Details 2) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
HPUs outstanding	156,326,416
AIMCO PROPERTIES, L.P.
Related Party Transaction [Line Items]
Redeemable Partnership Preferred Units redeemed for cash during period	700	12,600	3,600
Common OP Units redeemed in exchange for cash during period	112,000	268,000	105,000
HPUs outstanding	164,179,533
High Performance Units [Member] | AIMCO PROPERTIES, L.P.
Related Party Transaction [Line Items]
HPUs outstanding	2,339,950	2,339,950	2,339,950

Share-Based Compensation - (De

Share-Based Compensation - (Details) - Stock Options [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary of outstanding stock options
Number of options outstanding, beginning balance	1,640	2,991	3,045
Weighted average exercise price, beginning balance	$ 28.91	$ 28.48	$ 28.39
Number of options, granted	239	0	0
Weighted average exercise price options, granted	$ 39.05	$ 0	$ 0
Number of options, exercised	(484)	(1,347)	(44)
Weighted average exercise price options, exercised	$ 28.33	$ 27.97	$ 22.52
Number of options, forfeited	(1)	(4)	(10)
Weighted average exercise price options, forfeited	$ 25.78	$ 25.45	$ 27.82
Number of options outstanding, ending balance	1,394	1,640	2,991
Weighted average exercise price, ending balance	$ 30.85	$ 28.91	$ 28.48
Number of options exercisable at end of year	1,155	1,640	2,991
Weighted average exercise price, exercisable	$ 29.16	$ 28.91	$ 28.48

Share-Based Compensation - (81

Share-Based Compensation - (Details 1) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, Unvested at beginning of year	513	575	526
Weighted Average Grant-Date Fair Value, Unvested at beginning of year	$ 26.34	$ 25.28	$ 22.69
Number of shares, Granted	145	196	253
Weighted average grant-date fair value	$ 39.39	$ 26.69	$ 27.86
Number of shares, Vested	(259)	(238)	(204)
Weighted Average Grant-Date Fair Value, Vested	$ 27.54	$ 24.07	$ 21.81
Number of shares, Forfeited	(60)	(20)	0
Forfeited, weighted average grant date fair value	$ 32.29	$ 26.26	$ 0
Number of shares, Unvested at end of year	339	513	575
Weighted Average Grant-Date Fair Value, Unvested at end of year	$ 29.96	$ 26.34	$ 25.28
TSR Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, Unvested at beginning of year	0
Weighted Average Grant-Date Fair Value, Unvested at beginning of year	$ 0
Number of shares, Granted	142
Weighted average grant-date fair value	$ 39.72
Number of shares, Forfeited	(19)
Forfeited, weighted average grant date fair value	$ 39.72
Number of shares, Unvested at end of year	123	0
Weighted Average Grant-Date Fair Value, Unvested at end of year	$ 39.72	$ 0

Share-Based Compensation - (82

Share-Based Compensation - (Details 2) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total Compensation cost recognized for stock options and restricted stock awards	$ 7.2	$ 6.1	$ 5.9
Total compensation cost capitalized for options and restricted stock awards	0.5	0.3	0.3
Total unvested compensation cost not yet recognized for options and restricted stock awards	$ 11.3
Weighted average period over which unvested compensation cost expected to be recognized	1 year 9 months
TSR Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk free interest rate	1.04%
Expected dividend yield	2.87%
Expected volatility	19.48%
Derived vesting period, performance share awards fair value assumptions	3 years 5 months
Baseline common share value, performance share awards fair value assumptions	$ 39.05
TSR Restricted Shares Performance Measurement Period	3 years
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant-date fair value	$ 6.97
Term of stock options	10 years
Options outstanding, aggregate intrinsic value	$ 13.6
Options outstanding, weighted average remaining contractual term	3 years 2 months
Intrinsic value of stock options exercised	$ 5.5	10	0.3
Requisite service period	4 years
Vest period	4 years
Options exercisable, aggregate intrinsic value	$ 13.4
Options exercisable, weighted average remaining contractual term	2 years
Risk free interest rate	1.68%
Expected dividend yield	2.87%
Expected volatility	25.19%
Derived vesting period, performance share awards fair value assumptions	5 years 6 months
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate fair value of shares that vested	$ 10.4	$ 6.7	$ 5.7
Requisite service period	4 years
2007 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available to be granted under plan	150,000
2015 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available to be granted under plan	1,600,000
Additional shares authorized under plan	2,300,000
NAREIT Apartment Index [Member] | TSR Restricted Stock [Member]
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 [Member] | TSR Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted Percentage of Index Used to Compare to TSR	40.00%
36 Months After Grant Date [Member] | TSR Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, TSR restricted stock	50.00%
48 Months After Grant Date [Member] | TSR Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, TSR restricted stock	50.00%

Assets Held for Sale and Disc83

Assets Held for Sale and Discontinued Operations - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of income from discontinued operations including portions attributable to Aimco and noncontrolling interests
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax			$ 2,098
Gain on dispositions of real estate			212,459
Income tax expense	$ 0	$ 0	(11,328)
Income from discontinued operations, net of tax	0	0	203,229
Income from discontinued operations attributable to noncontrolling interests in consolidated real estate partnerships			(31,842)
Income from discontinued operations attributable to the Aimco Operating Partnership			171,387
Income from discontinued operations attributable to noncontrolling interests in Aimco Operating Partnership			(9,248)
Income from discontinued operations attributable to Aimco	$ 0	$ 0	$ 162,139

Assets Held for Sale and Disc84

Assets Held for Sale and Discontinued Operations - (Details 1) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015USD ($)UnitsProperty	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)UnitsProperty	Sep. 30, 2014USD ($)	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Dec. 31, 2015USD ($)UnitsProperty	Dec. 31, 2014USD ($)UnitsProperty	Dec. 31, 2013USD ($)UnitsProperty
Discontinued Operations and Disposal Groups [Line Items]
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	$ 25,257	$ 23,769	$ 23,907	$ 18,457	$ 19,306	$ 18,186	$ 17,943	$ 12,040	$ 91,390	$ 67,475	$ 34,596
Wholly and Partially Owned And Consolidated Properties [Member] | Assets Held-for-sale [Member]
Discontinued Operations and Disposal Groups [Line Items]
Number of apartment communities | Property	1								1
Number of apartment homes | Property	96								96
Disposal Group Disposed Of By Sale Not Discontinued Operations [Member] | Wholly and Partially Owned And Consolidated Properties [Member]
Discontinued Operations and Disposal Groups [Line Items]
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest									$ 14,191	55,122
Payments of Debt Extinguishment Costs									25,800	25,200
Mark To Market Portion Of Debt Extinguishment Cost Payments									$ 16,600	$ 16,600
Number of apartment communities | Property	11				30				11	30
Number of apartment homes | Units	3,855				9,067				3,855	9,067
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Wholly and Partially Owned And Consolidated Properties [Member]
Discontinued Operations and Disposal Groups [Line Items]
Payments of Debt Extinguishment Costs											16,500
Mark To Market Portion Of Debt Extinguishment Cost Payments											$ 6,100
Number of apartment communities | Property											29
Number of apartment homes | Units											6,953

Earnings (Loss) per Share_Uni85

Earnings (Loss) per Share/Unit - (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator:
Income from continuing operations	$ 25,257	$ 23,769	$ 23,907	$ 18,457	$ 19,306	$ 18,186	$ 17,943	$ 12,040	$ 91,390	$ 67,475	$ 34,596
Gain on dispositions of real estate, net of tax	(50,119)	0	(44,781)	(85,693)	(26,153)	(126,329)	(66,662)	(69,492)	(180,593)	(288,636)	0
(Income) loss from continuing operations and gain on dispositions attributable to noncontrolling interests									(23,273)	(46,862)	10,555
Income attributable to preferred stockholders									(11,794)	(7,947)	(2,804)
Income attributable to participating securities									(950)	(1,082)	(813)
Income from continuing operations attributable to Aimco common stockholders									235,966	300,220	41,534
Income from discontinued operations, net of tax									0	0	203,229
Income from discontinued operations attributable to noncontrolling interests									0	0	(41,090)
Income from discontinued operations attributable to Aimco									0	0	162,139
Net income	75,376	23,769	68,688	104,150	45,459	144,515	84,605	81,532	271,983	356,111	237,825
Net Income Attributable to Noncontrolling Interests									(23,273)	(46,862)	(30,535)
Net income attributable to noncontrolling interests									(4,776)	(24,595)	(12,473)
Net income attributable to the company's preferred equityholders									(11,794)	(7,947)	(2,804)
Net income attributable to participating securities									(950)	(1,082)	(813)
Net income attributable to the company's common equityholders	$ 66,639	$ 19,179	$ 60,804	$ 89,344	$ 36,269	$ 124,706	$ 75,010	$ 64,235	$ 235,966	$ 300,220	$ 203,673
Denominator:
Weighted average common shares/units outstanding - basic	155,725	155,639	155,524	153,821	145,753	145,672	145,657	145,473	155,177	145,639	145,291
Dilutive potential common shares/units									(393)	(363)	(241)
Weighted average common shares/units outstanding - diluted	156,043	156,008	155,954	154,277	146,238	146,104	145,985	145,681	155,570	146,002	145,532
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.43	$ 0.12	$ 0.39	$ 0.58	$ 0.25	$ 0.86	$ 0.51	$ 0.44
Earnings (loss) per common share/unit - basic and diluted
Income from continuing operations attributable to the company's common equityholders (In dollars per share/unit)s									$ 1.52	$ 2.06	$ 0.29
Income from discontinued operations									0	0	1.11
Earnings Per Share, Basic	$ 0.43	$ 0.12	$ 0.39	$ 0.58	$ 0.25	$ 0.86	$ 0.51	$ 0.44
Net income attributable to the company's common equity holders									1.52	2.06	1.40
Dividends declared per common share/unit									$ 1.18	$ 1.04	$ 0.96
AIMCO PROPERTIES, L.P.
Numerator:
Income from continuing operations	$ 25,257	$ 23,769	$ 23,907	$ 18,457	$ 19,306	$ 18,186	$ 17,943	$ 12,040	$ 91,390	$ 67,475	$ 34,596
Gain on dispositions of real estate, net of tax	(50,119)	0	(44,781)	(85,693)	(26,153)	(126,329)	(66,662)	(69,492)	(180,593)	(288,636)	0
(Income) loss from continuing operations and gain on dispositions attributable to noncontrolling interests									(4,776)	(24,595)	19,369
Income attributable to preferred stockholders									(18,737)	(14,444)	(9,227)
Income attributable to participating securities									(950)	(1,082)	(813)
Income from continuing operations attributable to Aimco common stockholders									247,520	315,990	43,925
Income from discontinued operations, net of tax									0	0	203,229
Income from discontinued operations attributable to noncontrolling interests									0	0	(31,842)
Income from discontinued operations attributable to Aimco									0	0	171,387
Net income	75,376	23,769	68,688	104,150	45,459	144,515	84,605	81,532	271,983	356,111	237,825
Net income attributable to noncontrolling interests									(4,776)	(24,595)	(12,473)
Net income attributable to the company's preferred equityholders									(18,737)	(14,444)	(9,227)
Net income attributable to participating securities									(950)	(1,082)	(813)
Net income attributable to the company's common equityholders	$ 69,930	$ 20,072	$ 63,776	$ 93,742	$ 38,144	$ 131,255	$ 78,745	$ 67,846	$ 247,520	$ 315,990	$ 215,312
Denominator:
Weighted average common shares/units outstanding - basic	163,485	163,241	163,149	161,461	153,408	153,337	153,377	153,329	162,834	153,363	153,256
Dilutive potential common shares/units									(393)	(363)	(241)
Weighted average common shares/units outstanding - diluted	163,803	163,610	163,579	161,917	153,893	153,769	153,705	153,537	163,227	153,726	153,497
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.43	$ 0.12	$ 0.39	$ 0.58	$ 0.25	$ 0.86	$ 0.51	$ 0.44
Earnings (loss) per common share/unit - basic and diluted
Income from continuing operations attributable to the company's common equityholders (In dollars per share/unit)s									$ 1.52	$ 2.06	$ 0.29
Income from discontinued operations									0	0	1.11
Earnings Per Share, Basic	$ 0.43	$ 0.12	$ 0.39	$ 0.58	$ 0.25	$ 0.86	$ 0.51	$ 0.44
Net income attributable to the company's common equity holders									1.52	2.06	1.40
Dividends declared per common share/unit									$ 1.18	$ 1.04	$ 0.96

Earnings (Loss) per Share_Uni86

Earnings (Loss) per Share/Unit - (Details 1) - shares shares in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	1.4
Nonvested Restricted Shares of Common Stock with Non-forfeitable Dividend Rights	0.3	0.5	0.6
Number of Shares of Common Stock Required to Redeem Preferred OP Units Tendered for Redemption, if Parent Chooses to Redeem in Sares Rther than Cash	2.2
AIMCO PROPERTIES, L.P.
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	1.4
Nonvested Restricted Shares of Common Stock with Non-forfeitable Dividend Rights	0.3	0.5	0.6

Unaudited Summarized Consolid87

Unaudited Summarized Consolidated Quarterly Information - (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summarized unaudited consolidated quarterly information
Total revenues	$ 245,875	$ 246,387	$ 244,783	$ 244,265	$ 242,178	$ 246,843	$ 246,418	$ 248,924	$ 981,310	$ 984,363	$ 974,053
Total operating expenses	(180,391)	(182,366)	(179,140)	(183,198)	(178,370)	(179,376)	(180,621)	(183,646)	(725,095)	(722,013)	(725,034)
Operating income	65,484	64,021	65,643	61,067	63,808	67,467	65,797	65,278	256,215	262,350	249,019
Income from continuing operations	25,257	23,769	23,907	18,457	19,306	18,186	17,943	12,040	91,390	67,475	34,596
Gain on dispositions of real estate, net of tax	50,119	0	44,781	85,693	26,153	126,329	66,662	69,492	180,593	288,636	0
Net income	75,376	23,769	68,688	104,150	45,459	144,515	84,605	81,532	271,983	356,111	237,825
Net income attributable to the company's common equityholders	$ 66,639	$ 19,179	$ 60,804	$ 89,344	$ 36,269	$ 124,706	$ 75,010	$ 64,235	$ 235,966	$ 300,220	$ 203,673
Income from continuing operations attributable to the company's common equityholders	$ 0.43	$ 0.12	$ 0.39	$ 0.58	$ 0.25	$ 0.86	$ 0.51	$ 0.44
Net income attributable to the company's common equityholders	0.43	0.12	0.39	0.58	0.25	0.86	0.51	0.44
Net income attributable to the company's common equityholders	$ 0.43	$ 0.12	$ 0.39	$ 0.58	$ 0.25	$ 0.85	$ 0.51	$ 0.44
Loss per common share - basic and diluted:
Weighted average common shares/units outstanding - basic	155,725	155,639	155,524	153,821	145,753	145,672	145,657	145,473	155,177	145,639	145,291
Weighted average common shares/units outstanding - diluted	156,043	156,008	155,954	154,277	146,238	146,104	145,985	145,681	155,570	146,002	145,532
Income (Loss) from Continuing Operations, Per Diluted Share	$ 0.43	$ 0.12	$ 0.39	$ 0.58	$ 0.25	$ 0.85	$ 0.51	$ 0.44
AIMCO PROPERTIES, L.P.
Summarized unaudited consolidated quarterly information
Total revenues	$ 245,875	$ 246,387	$ 244,783	$ 244,265	$ 242,178	$ 246,843	$ 246,418	$ 248,924	$ 981,310	$ 984,363	$ 974,053
Total operating expenses	(180,391)	(182,366)	(179,140)	(183,198)	(178,370)	(179,376)	(180,621)	(183,646)	(725,095)	(722,013)	(725,034)
Operating income	65,484	64,021	65,643	61,067	63,808	67,467	65,797	65,278	256,215	262,350	249,019
Income from continuing operations	25,257	23,769	23,907	18,457	19,306	18,186	17,943	12,040	91,390	67,475	34,596
Gain on dispositions of real estate, net of tax	50,119	0	44,781	85,693	26,153	126,329	66,662	69,492	180,593	288,636	0
Net income	75,376	23,769	68,688	104,150	45,459	144,515	84,605	81,532	271,983	356,111	237,825
Net income attributable to the company's common equityholders	$ 69,930	$ 20,072	$ 63,776	$ 93,742	$ 38,144	$ 131,255	$ 78,745	$ 67,846	$ 247,520	$ 315,990	$ 215,312
Income from continuing operations attributable to the company's common equityholders	$ 0.43	$ 0.12	$ 0.39	$ 0.58	$ 0.25	$ 0.86	$ 0.51	$ 0.44
Net income attributable to the company's common equityholders	0.43	0.12	0.39	0.58	0.25	0.86	0.51	0.44
Net income attributable to the company's common equityholders	$ 0.43	$ 0.12	$ 0.39	$ 0.58	$ 0.25	$ 0.85	$ 0.51	$ 0.44
Loss per common share - basic and diluted:
Weighted average common shares/units outstanding - basic	163,485	163,241	163,149	161,461	153,408	153,337	153,377	153,329	162,834	153,363	153,256
Weighted average common shares/units outstanding - diluted	163,803	163,610	163,579	161,917	153,893	153,769	153,705	153,537	163,227	153,726	153,497
Income (Loss) from Continuing Operations, Per Diluted Share	$ 0.43	$ 0.12	$ 0.39	$ 0.58	$ 0.25	$ 0.85	$ 0.51	$ 0.44

Business Segments - (Details)

Business Segments - (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Summary information for the reportable segments
Rental and other property revenues (3)										$ 956,954		$ 952,831		$ 939,231
Tax credit and asset management revenues										24,356		31,532		34,822
Total revenues		$ 245,875	$ 246,387	$ 244,783	$ 244,265	$ 242,178	$ 246,843	$ 246,418	$ 248,924	981,310		984,363		974,053
Property operating expenses (3)										359,393		373,654		375,710
Investment management expenses										5,855		7,310		4,341
Depreciation and amortization (3)										306,301		282,608		291,910
Provision for real estate impairment losses (3)										0		1,820		0
General and administrative expenses										43,178		44,092		45,670
Other expenses, net										10,368		12,529		7,403
Total operating expenses		180,391	182,366	179,140	183,198	178,370	179,376	180,621	183,646	725,095		722,013		725,034
Operating income (loss)		65,484	64,021	65,643	61,067	63,808	67,467	65,797	65,278	256,215		262,350		249,019
Other items included in continuing operations										(164,825)		(194,875)		(214,423)
Income from continuing operations		$ 25,257	$ 23,769	$ 23,907	$ 18,457	$ 19,306	$ 18,186	$ 17,943	$ 12,040	91,390		67,475		34,596
Operating Segments [Member] | Conventional Real Estate Operations [Member]
Summary information for the reportable segments
Rental and other property revenues (3)	[1]									798,321		729,657		679,422
Total revenues										798,321		729,657		679,422
Property operating expenses (3)	[1]									263,573		245,264		233,183
Total operating expenses										263,573		245,264		233,183
Operating income (loss)										534,748		484,393		446,239
Income from continuing operations										534,748		484,393		446,239
Operating Segments [Member] | Affordable Real Estate Operations [Member]
Summary information for the reportable segments
Rental and other property revenues (3)	[1]									96,549		94,501		93,033
Total revenues										96,549		94,501		93,033
Property operating expenses (3)	[1]									38,484		38,407		37,433
Provision for real estate impairment losses (3)												0
Total operating expenses										38,484		38,407		37,433
Operating income (loss)										58,065		56,094		55,600
Income from continuing operations										58,065		56,094		55,600
Proportionate Adjustments [Member]
Summary information for the reportable segments
Rental and other property revenues (3)	[1],[2]									37,369		29,564		66,489
Total revenues	[2]									37,369		29,564		66,489
Property operating expenses (3)	[1],[2]									13,815		8,878		25,192
Total operating expenses	[2]									13,815		8,878		25,192
Operating income (loss)	[2]									23,554		20,686		41,297
Income from continuing operations	[2]									23,554		20,686		41,297
Corporate Nonsegment And Other Reconciling Items Member [Member]
Summary information for the reportable segments
Rental and other property revenues (3)	[1],[3]									24,715		99,109		100,287
Tax credit and asset management revenues	[3]									24,356		31,532		34,822
Total revenues	[3]									49,071		130,641		135,109
Property operating expenses (3)	[1],[3]									43,521		81,105		79,902
Investment management expenses										5,855	[3]	7,310	[3]	4,341
Depreciation and amortization (3)	[1],[3]									306,301		282,608		291,910
Provision for real estate impairment losses (3)	[3]											1,820
General and administrative expenses	[3]									43,178		44,092		45,670
Other expenses, net	[3]									10,368		12,529		7,403
Total operating expenses	[3]									409,223		429,464		429,226
Operating income (loss)	[3]									(360,152)		(298,823)		(294,117)
Other items included in continuing operations	[3]									(164,825)		(194,875)		(214,423)
Income from continuing operations	[3]									$ (524,977)		$ (493,698)		$ (508,540)
[1]	Proportionate property net operating income, our key measurement of segment profit or loss excludes property management revenues (which are included in rental and other property revenues), property management expenses and casualty gains and losses (which are included in property operating expenses), depreciation and amortization and provision for real estate impairment losses. Accordingly, we do not allocate these amounts to our segments.
[2]	Represents adjustments for the noncontrolling interests in consolidated real estate partnerships’ share of the results of our consolidated apartment communities and the results of consolidated apartment communities that we do not manage, which are excluded from our measurement of segment performance but included in the related consolidated amounts, and our share of the results of operations of our unconsolidated real estate partnerships that we manage, which are included in our measurement of segment performance but excluded from the related consolidated amounts.
[3]	Our basis for assessing segment performance excludes the results of apartment communities sold or classified as held for sale. As discussed in Note 2, effective January 1, 2014, we adopted ASU 2014-08, which revised the definition of a discontinued operation. In the segment presentation above, the current year and prior years' operating results for apartment communities sold or classified as held for sale during the years ended December 31, 2015 and 2014, are presented within the Corporate and Amounts Not Allocated to Segments column. The operating results for the year ended December 31, 2013, for apartment communities sold through December 31, 2013, are presented within discontinued operations and are accordingly excluded from the segment presentation above.

Business Segments - (Details 1

Business Segments - (Details 1) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total assets		$ 6,144,194	$ 6,097,028
Operating Segments [Member] | Conventional Real Estate [Member]
Segment Reporting Information [Line Items]
Total assets		5,107,059	4,841,402
Operating Segments [Member] | Affordable Real Estate Operations [Member]
Segment Reporting Information [Line Items]
Total assets		421,932	439,488
Proportionate Adjustments [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	175,042	179,323
Corporate Nonsegment And Other Reconciling Items Member [Member]
Segment Reporting Information [Line Items]
Total assets	[2]	$ 440,161	$ 636,815
[1]	Represents adjustments for the noncontrolling interests in consolidated real estate partnerships’ share of the assets of our consolidated apartment communities, which are excluded from our measurement of segment financial condition, and our share of the assets of our unconsolidated real estate partnerships, which are included in our measure of segment financial condition.
[2]	(2)Our basis for assessing segment performance excludes the results of apartment communities sold or classified as held for sale, therefore, assets related to apartment communities sold or classified as held for sale during the periods are included within Corporate and other assets for comparative periods presented.

Business Segments - (Details 2

Business Segments - (Details 2) $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)UnitsPropertySegment	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	2
Conventional Real Estate [Member]
Segment Reporting Information [Line Items]
Number of apartment communities in segments | Property	140
Number of apartment homes | Units	40,464
Affordable Real Estate Operations [Member]
Segment Reporting Information [Line Items]
Number of apartment communities in segments | Property	56
Number of apartment homes | Units	8,685
Operating Segments [Member] | Conventional Real Estate [Member]
Segment Reporting Information [Line Items]
Captial Additions | $	$ 350.1	$ 355.4	$ 365.3
Operating Segments [Member] | Affordable Real Estate Operations [Member]
Segment Reporting Information [Line Items]
Captial Additions | $	$ 12.9	$ 12.1	$ 10.7

Real Estate and Accumulated D91

Real Estate and Accumulated Depreciation - (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2015USD ($)Units	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)
Real Estate and Accumulated Depreciation [Line Items]
Total		$ 8,307,483	$ 8,144,958	$ 8,214,081	$ 8,333,419
Accumulated Depreciation (AD)		(2,778,022)	$ (2,672,179)	$ (2,822,872)	$ (2,820,765)
Real Estate and Accumulated Depreciation (Textual) [Abstract]
Aggregate cost of land and depreciable property for federal income tax purposes		$ 3,800,000
Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Number of apartment homes | Units		48,224
Initial Cost, Land	[1]	$ 1,950,627
Initial Cost, Buildings and Improvements	[1]	3,488,040
Costs Capitalized Subsequent to Consolidation	[2]	2,964,448
Land		1,861,157
Buildings and Improvements		6,446,326
Total	[3]	8,307,483
Accumulated Depreciation (AD)		(2,778,022)
Total Cost Net of Accumulated Depreciation		5,529,461
Encumbrances		$ 3,846,160
Total Conventional Properties [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Number of apartment homes | Units		40,226
Initial Cost, Land	[1]	$ 1,834,423
Initial Cost, Buildings and Improvements	[1]	3,104,080
Costs Capitalized Subsequent to Consolidation	[2]	2,606,954
Land		1,744,952
Buildings and Improvements		5,711,030
Total	[3]	7,455,982
Accumulated Depreciation (AD)		(2,371,248)
Total Cost Net of Accumulated Depreciation		5,084,734
Encumbrances		$ 3,515,121
100 Forest Place [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Dec. 1, 1997
Property Location		Oak Park, IL
Year Built		Jan. 1, 1987
Number of apartment homes | Units		234
Initial Cost, Land	[1]	$ 2,664
Initial Cost, Buildings and Improvements	[1]	18,815
Costs Capitalized Subsequent to Consolidation	[2]	7,674
Land		2,664
Buildings and Improvements		26,489
Total	[3]	29,153
Accumulated Depreciation (AD)		(12,726)
Total Cost Net of Accumulated Depreciation		16,427
Encumbrances		$ 0
118-122 West 23rd Street [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Jun. 1, 2012
Property Location		New York, NY
Year Built		Jan. 1, 1987
Number of apartment homes | Units		42
Initial Cost, Land	[1]	$ 14,985
Initial Cost, Buildings and Improvements	[1]	23,459
Costs Capitalized Subsequent to Consolidation	[2]	6,171
Land		14,985
Buildings and Improvements		29,630
Total	[3]	44,615
Accumulated Depreciation (AD)		(4,265)
Total Cost Net of Accumulated Depreciation		40,350
Encumbrances		$ 18,726
1582 First Avenue [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Mar. 1, 2005
Property Location		New York, NY
Year Built		Jan. 1, 1900
Number of apartment homes | Units		17
Initial Cost, Land	[1]	$ 4,281
Initial Cost, Buildings and Improvements	[1]	752
Costs Capitalized Subsequent to Consolidation	[2]	363
Land		4,281
Buildings and Improvements		1,115
Total	[3]	5,396
Accumulated Depreciation (AD)		(440)
Total Cost Net of Accumulated Depreciation		4,956
Encumbrances		$ 2,419
173 E. 90th Street [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	May 1, 2004
Property Location		New York, NY
Year Built		Jan. 1, 1910
Number of apartment homes | Units		72
Initial Cost, Land	[1]	$ 12,066
Initial Cost, Buildings and Improvements	[1]	4,535
Costs Capitalized Subsequent to Consolidation	[2]	3,008
Land		12,066
Buildings and Improvements		7,543
Total	[3]	19,609
Accumulated Depreciation (AD)		(2,749)
Total Cost Net of Accumulated Depreciation		16,860
Encumbrances		$ 7,120
21 Fitzsimons [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid-Rise
Date Consolidated	[4]	Aug. 1, 2014
Property Location		Aurora, CO
Year Built		Jan. 1, 2008
Number of apartment homes | Units		600
Initial Cost, Land	[1]	$ 12,864
Initial Cost, Buildings and Improvements	[1]	104,720
Costs Capitalized Subsequent to Consolidation	[2]	1,583
Land		12,864
Buildings and Improvements		106,303
Total	[3]	119,167
Accumulated Depreciation (AD)		(5,055)
Total Cost Net of Accumulated Depreciation		114,112
Encumbrances		$ 48,995
234 East 88th Street [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid-Rise
Date Consolidated	[4]	Jan. 1, 2014
Property Location		New York, NY
Year Built		Jan. 1, 1900
Number of apartment homes | Units		20
Initial Cost, Land	[1]	$ 2,448
Initial Cost, Buildings and Improvements	[1]	4,449
Costs Capitalized Subsequent to Consolidation	[2]	482
Land		2,448
Buildings and Improvements		4,931
Total	[3]	7,379
Accumulated Depreciation (AD)		(351)
Total Cost Net of Accumulated Depreciation		7,028
Encumbrances		$ 3,433
182-188 Columbus Avenue [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Feb. 1, 2007
Property Location		New York, NY
Year Built		Jan. 1, 1910
Number of apartment homes | Units		32
Initial Cost, Land	[1]	$ 19,123
Initial Cost, Buildings and Improvements	[1]	3,300
Costs Capitalized Subsequent to Consolidation	[2]	3,789
Land		19,123
Buildings and Improvements		7,089
Total	[3]	26,212
Accumulated Depreciation (AD)		(2,618)
Total Cost Net of Accumulated Depreciation		23,594
Encumbrances		$ 13,471
236-238 East 88th Street [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Jan. 1, 2004
Property Location		New York, NY
Year Built		Jan. 1, 1900
Number of apartment homes | Units		43
Initial Cost, Land	[1]	$ 8,820
Initial Cost, Buildings and Improvements	[1]	2,914
Costs Capitalized Subsequent to Consolidation	[2]	1,789
Land		8,820
Buildings and Improvements		4,703
Total	[3]	13,523
Accumulated Depreciation (AD)		(1,605)
Total Cost Net of Accumulated Depreciation		11,918
Encumbrances		$ 11,587
237-239 Ninth Avenue [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Mar. 1, 2005
Property Location		New York, NY
Year Built		Jan. 1, 1900
Number of apartment homes | Units		36
Initial Cost, Land	[1]	$ 8,495
Initial Cost, Buildings and Improvements	[1]	1,866
Costs Capitalized Subsequent to Consolidation	[2]	2,820
Land		8,495
Buildings and Improvements		4,686
Total	[3]	13,181
Accumulated Depreciation (AD)		(1,578)
Total Cost Net of Accumulated Depreciation		11,603
Encumbrances		$ 5,909
240 West 73rd Street, LLC [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Sep. 1, 2004
Property Location		New York, NY
Year Built		Jan. 1, 1900
Number of apartment homes | Units		200
Initial Cost, Land	[1]	$ 68,109
Initial Cost, Buildings and Improvements	[1]	12,140
Costs Capitalized Subsequent to Consolidation	[2]	9,914
Land		68,109
Buildings and Improvements		22,054
Total	[3]	90,163
Accumulated Depreciation (AD)		(7,797)
Total Cost Net of Accumulated Depreciation		82,366
Encumbrances		$ 0
2900 on First Apartments [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Oct. 1, 2008
Property Location		Seattle, WA
Year Built		Jan. 1, 1989
Number of apartment homes | Units		135
Initial Cost, Land	[1]	$ 19,070
Initial Cost, Buildings and Improvements	[1]	17,518
Costs Capitalized Subsequent to Consolidation	[2]	32,320
Land		19,070
Buildings and Improvements		49,838
Total	[3]	68,908
Accumulated Depreciation (AD)		(11,931)
Total Cost Net of Accumulated Depreciation		56,977
Encumbrances		$ 0
306 East 89th Street [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Jul. 1, 2004
Property Location		New York, NY
Year Built		Jan. 1, 1930
Number of apartment homes | Units		20
Initial Cost, Land	[1]	$ 2,680
Initial Cost, Buildings and Improvements	[1]	1,006
Costs Capitalized Subsequent to Consolidation	[2]	525
Land		2,680
Buildings and Improvements		1,531
Total	[3]	4,211
Accumulated Depreciation (AD)		(522)
Total Cost Net of Accumulated Depreciation		3,689
Encumbrances		$ 1,973
311 & 313 East 73rd Street [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Mar. 1, 2003
Property Location		New York, NY
Year Built		Jan. 1, 1904
Number of apartment homes | Units		34
Initial Cost, Land	[1]	$ 5,678
Initial Cost, Buildings and Improvements	[1]	1,609
Costs Capitalized Subsequent to Consolidation	[2]	503
Land		5,678
Buildings and Improvements		2,112
Total	[3]	7,790
Accumulated Depreciation (AD)		(1,293)
Total Cost Net of Accumulated Depreciation		6,497
Encumbrances		$ 4,159
322-324 East 61st Street [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Mar. 1, 2005
Property Location		New York, NY
Year Built		Jan. 1, 1900
Number of apartment homes | Units		40
Initial Cost, Land	[1]	$ 6,372
Initial Cost, Buildings and Improvements	[1]	2,224
Costs Capitalized Subsequent to Consolidation	[2]	1,175
Land		6,372
Buildings and Improvements		3,399
Total	[3]	9,771
Accumulated Depreciation (AD)		(1,456)
Total Cost Net of Accumulated Depreciation		8,315
Encumbrances		$ 3,628
3400 Avenue of the Arts [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Mar. 1, 2002
Property Location		Costa Mesa, CA
Year Built		Jan. 1, 1987
Number of apartment homes | Units		770
Initial Cost, Land	[1]	$ 57,241
Initial Cost, Buildings and Improvements	[1]	65,506
Costs Capitalized Subsequent to Consolidation	[2]	73,411
Land		57,241
Buildings and Improvements		138,917
Total	[3]	196,158
Accumulated Depreciation (AD)		(77,731)
Total Cost Net of Accumulated Depreciation		118,427
Encumbrances		$ 108,983
452 East 78th Street [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Jan. 1, 2004
Property Location		New York, NY
Year Built		Jan. 1, 1900
Number of apartment homes | Units		12
Initial Cost, Land	[1]	$ 1,982
Initial Cost, Buildings and Improvements	[1]	608
Costs Capitalized Subsequent to Consolidation	[2]	397
Land		1,982
Buildings and Improvements		1,005
Total	[3]	2,987
Accumulated Depreciation (AD)		(381)
Total Cost Net of Accumulated Depreciation		2,606
Encumbrances		$ 2,708
464-466 Amsterdam & 200-210 W. 83rd Street [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Feb. 1, 2007
Property Location		New York, NY
Year Built		Jan. 1, 1910
Number of apartment homes | Units		71
Initial Cost, Land	[1]	$ 25,553
Initial Cost, Buildings and Improvements	[1]	7,101
Costs Capitalized Subsequent to Consolidation	[2]	5,268
Land		25,553
Buildings and Improvements		12,369
Total	[3]	37,922
Accumulated Depreciation (AD)		(4,936)
Total Cost Net of Accumulated Depreciation		32,986
Encumbrances		$ 19,679
510 East 88th Street [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Jan. 1, 2004
Property Location		New York, NY
Year Built		Jan. 1, 1900
Number of apartment homes | Units		20
Initial Cost, Land	[1]	$ 3,163
Initial Cost, Buildings and Improvements	[1]	1,002
Costs Capitalized Subsequent to Consolidation	[2]	399
Land		3,163
Buildings and Improvements		1,401
Total	[3]	4,564
Accumulated Depreciation (AD)		(450)
Total Cost Net of Accumulated Depreciation		4,114
Encumbrances		$ 2,902
East Eighty Eighth Street Five Fourteen Five Sixteen [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Mar. 1, 2005
Property Location		New York, NY
Year Built		Jan. 1, 1900
Number of apartment homes | Units		36
Initial Cost, Land	[1]	$ 6,282
Initial Cost, Buildings and Improvements	[1]	2,168
Costs Capitalized Subsequent to Consolidation	[2]	842
Land		6,282
Buildings and Improvements		3,010
Total	[3]	9,292
Accumulated Depreciation (AD)		(1,213)
Total Cost Net of Accumulated Depreciation		8,079
Encumbrances		$ 3,933
East Eighty Eighth Street Five One Eight [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid-Rise
Date Consolidated	[4]	Jan. 1, 2014
Property Location		New York, NY
Year Built		Jan. 1, 1900
Number of apartment homes | Units		20
Initial Cost, Land	[1]	$ 2,233
Initial Cost, Buildings and Improvements	[1]	4,315
Costs Capitalized Subsequent to Consolidation	[2]	469
Land		2,233
Buildings and Improvements		4,784
Total	[3]	7,017
Accumulated Depreciation (AD)		(365)
Total Cost Net of Accumulated Depreciation		6,652
Encumbrances		$ 2,974
707 Leahy [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Apr. 1, 2007
Property Location		Redwood City, CA
Year Built		Jan. 1, 1973
Number of apartment homes | Units		110
Initial Cost, Land	[1]	$ 15,444
Initial Cost, Buildings and Improvements	[1]	7,909
Costs Capitalized Subsequent to Consolidation	[2]	5,527
Land		15,444
Buildings and Improvements		13,436
Total	[3]	28,880
Accumulated Depreciation (AD)		(6,065)
Total Cost Net of Accumulated Depreciation		22,815
Encumbrances		$ 9,284
865 Bellevue [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jul. 1, 2000
Property Location		Nashville, TN
Year Built		Jan. 1, 1972
Number of apartment homes | Units		326
Initial Cost, Land	[1]	$ 3,562
Initial Cost, Buildings and Improvements	[1]	12,037
Costs Capitalized Subsequent to Consolidation	[2]	28,446
Land		3,562
Buildings and Improvements		40,483
Total	[3]	44,045
Accumulated Depreciation (AD)		(25,489)
Total Cost Net of Accumulated Depreciation		18,556
Encumbrances		$ 17,533
1045 on the Park Apartment Homes [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Jul. 1, 2013
Property Location		Atlanta, GA
Year Built		Jan. 1, 2012
Number of apartment homes | Units		30
Initial Cost, Land	[1]	$ 2,793
Initial Cost, Buildings and Improvements	[1]	6,662
Costs Capitalized Subsequent to Consolidation	[2]	139
Land		2,793
Buildings and Improvements		6,801
Total	[3]	9,594
Accumulated Depreciation (AD)		(592)
Total Cost Net of Accumulated Depreciation		9,002
Encumbrances		$ 5,981
Axiom Apartment Homes - Cambridge MA [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Apr. 1, 2015
Property Location		Cambridge, MA
Year Built		Jan. 1, 2015
Number of apartment homes | Units		115
Initial Cost, Land	[1]	$ 0
Initial Cost, Buildings and Improvements	[1]	63,612
Costs Capitalized Subsequent to Consolidation	[2]	165
Land		0
Buildings and Improvements		63,777
Total	[3]	63,777
Accumulated Depreciation (AD)		(1,580)
Total Cost Net of Accumulated Depreciation		62,197
Encumbrances		$ 35,000
Bank Lofts [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Apr. 1, 2001
Property Location		Denver, CO
Year Built		Jan. 1, 1920
Number of apartment homes | Units		125
Initial Cost, Land	[1]	$ 3,525
Initial Cost, Buildings and Improvements	[1]	9,045
Costs Capitalized Subsequent to Consolidation	[2]	3,632
Land		3,525
Buildings and Improvements		12,677
Total	[3]	16,202
Accumulated Depreciation (AD)		(6,053)
Total Cost Net of Accumulated Depreciation		10,149
Encumbrances		$ 11,181
Bay Parc Plaza [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Sep. 1, 2004
Property Location		Miami, FL
Year Built		Jan. 1, 2000
Number of apartment homes | Units		471
Initial Cost, Land	[1]	$ 22,680
Initial Cost, Buildings and Improvements	[1]	41,847
Costs Capitalized Subsequent to Consolidation	[2]	9,486
Land		22,680
Buildings and Improvements		51,333
Total	[3]	74,013
Accumulated Depreciation (AD)		(14,939)
Total Cost Net of Accumulated Depreciation		59,074
Encumbrances		$ 44,194
Bay Ridge at Nashua [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jan. 1, 2003
Property Location		Nashua, NH
Year Built		Jan. 1, 1984
Number of apartment homes | Units		412
Initial Cost, Land	[1]	$ 3,262
Initial Cost, Buildings and Improvements	[1]	40,713
Costs Capitalized Subsequent to Consolidation	[2]	5,300
Land		3,262
Buildings and Improvements		46,013
Total	[3]	49,275
Accumulated Depreciation (AD)		(18,304)
Total Cost Net of Accumulated Depreciation		30,971
Encumbrances		$ 29,820
Bayberry Hill Estates [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Aug. 1, 2002
Property Location		Framingham, MA
Year Built		Jan. 1, 1971
Number of apartment homes | Units		424
Initial Cost, Land	[1]	$ 19,944
Initial Cost, Buildings and Improvements	[1]	35,945
Costs Capitalized Subsequent to Consolidation	[2]	12,765
Land		19,944
Buildings and Improvements		48,710
Total	[3]	68,654
Accumulated Depreciation (AD)		(22,056)
Total Cost Net of Accumulated Depreciation		46,598
Encumbrances		$ 32,051
Bluffs at Pacifica, The [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Oct. 1, 2006
Property Location		Pacifica, CA
Year Built		Jan. 1, 1963
Number of apartment homes | Units		64
Initial Cost, Land	[1]	$ 8,108
Initial Cost, Buildings and Improvements	[1]	4,132
Costs Capitalized Subsequent to Consolidation	[2]	14,672
Land		8,108
Buildings and Improvements		18,804
Total	[3]	26,912
Accumulated Depreciation (AD)		(9,922)
Total Cost Net of Accumulated Depreciation		16,990
Encumbrances		$ 5,694
Boston Lofts [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Apr. 1, 2001
Property Location		Denver, CO
Year Built		Jan. 1, 1890
Number of apartment homes | Units		158
Initial Cost, Land	[1]	$ 3,446
Initial Cost, Buildings and Improvements	[1]	20,589
Costs Capitalized Subsequent to Consolidation	[2]	5,634
Land		3,446
Buildings and Improvements		26,223
Total	[3]	29,669
Accumulated Depreciation (AD)		(12,820)
Total Cost Net of Accumulated Depreciation		16,849
Encumbrances		$ 16,333
Boulder Creek [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jul. 1, 1994
Property Location		Boulder, CO
Year Built		Jan. 1, 1973
Number of apartment homes | Units		221
Initial Cost, Land	[1]	$ 754
Initial Cost, Buildings and Improvements	[1]	7,730
Costs Capitalized Subsequent to Consolidation	[2]	20,205
Land		754
Buildings and Improvements		27,935
Total	[3]	28,689
Accumulated Depreciation (AD)		(16,502)
Total Cost Net of Accumulated Depreciation		12,187
Encumbrances		$ 6,708
Broadcast Center [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2002
Property Location		Los Angeles, CA
Year Built		Jan. 1, 1990
Number of apartment homes | Units		279
Initial Cost, Land	[1]	$ 29,407
Initial Cost, Buildings and Improvements	[1]	41,244
Costs Capitalized Subsequent to Consolidation	[2]	27,070
Land		29,407
Buildings and Improvements		68,314
Total	[3]	97,721
Accumulated Depreciation (AD)		(34,668)
Total Cost Net of Accumulated Depreciation		63,053
Encumbrances		$ 0
Broadway Lofts [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Sep. 1, 2012
Property Location		San Diego, CA
Year Built		Jan. 1, 1909
Number of apartment homes | Units		84
Initial Cost, Land	[1]	$ 5,367
Initial Cost, Buildings and Improvements	[1]	14,442
Costs Capitalized Subsequent to Consolidation	[2]	1,297
Land		5,367
Buildings and Improvements		15,739
Total	[3]	21,106
Accumulated Depreciation (AD)		(1,862)
Total Cost Net of Accumulated Depreciation		19,244
Encumbrances		$ 9,448
Vivo - Cambridge MA [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Jun. 1, 2015
Property Location		Cambridge, MA
Year Built		Jan. 1, 2015
Number of apartment homes | Units		91
Initial Cost, Land	[1]	$ 6,450
Initial Cost, Buildings and Improvements	[1]	35,974
Costs Capitalized Subsequent to Consolidation	[2]	1,332
Land		6,450
Buildings and Improvements		37,306
Total	[3]	43,756
Accumulated Depreciation (AD)		(480)
Total Cost Net of Accumulated Depreciation		43,276
Encumbrances		$ 0
Burke Shire Commons [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2001
Property Location		Burke, VA
Year Built		Jan. 1, 1986
Number of apartment homes | Units		360
Initial Cost, Land	[1]	$ 4,867
Initial Cost, Buildings and Improvements	[1]	23,617
Costs Capitalized Subsequent to Consolidation	[2]	13,699
Land		4,867
Buildings and Improvements		37,316
Total	[3]	42,183
Accumulated Depreciation (AD)		(17,380)
Total Cost Net of Accumulated Depreciation		24,803
Encumbrances		$ 40,536
Calhoun Beach Club [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Dec. 1, 1998
Property Location		Minneapolis, MN
Year Built		Jan. 1, 1928
Number of apartment homes | Units		332
Initial Cost, Land	[1]	$ 11,708
Initial Cost, Buildings and Improvements	[1]	73,334
Costs Capitalized Subsequent to Consolidation	[2]	54,533
Land		11,708
Buildings and Improvements		127,867
Total	[3]	139,575
Accumulated Depreciation (AD)		(67,386)
Total Cost Net of Accumulated Depreciation		72,189
Encumbrances		$ 45,050
Canyon Terrace [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2002
Property Location		Saugus, CA
Year Built		Jan. 1, 1984
Number of apartment homes | Units		130
Initial Cost, Land	[1]	$ 7,508
Initial Cost, Buildings and Improvements	[1]	6,601
Costs Capitalized Subsequent to Consolidation	[2]	6,024
Land		7,508
Buildings and Improvements		12,625
Total	[3]	20,133
Accumulated Depreciation (AD)		(7,170)
Total Cost Net of Accumulated Depreciation		12,963
Encumbrances		$ 9,708
Cedar Rim [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Apr. 1, 2000
Property Location		Newcastle, WA
Year Built		Jan. 1, 1980
Number of apartment homes | Units		104
Initial Cost, Land	[1]	$ 761
Initial Cost, Buildings and Improvements	[1]	5,218
Costs Capitalized Subsequent to Consolidation	[2]	16,939
Land		761
Buildings and Improvements		22,157
Total	[3]	22,918
Accumulated Depreciation (AD)		(18,439)
Total Cost Net of Accumulated Depreciation		4,479
Encumbrances		$ 7,246
Charlesbank Apartment Homes [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Sep. 1, 2013
Property Location		Watertown, MA
Year Built		Jan. 1, 2012
Number of apartment homes | Units		44
Initial Cost, Land	[1]	$ 3,399
Initial Cost, Buildings and Improvements	[1]	11,726
Costs Capitalized Subsequent to Consolidation	[2]	281
Land		3,399
Buildings and Improvements		12,007
Total	[3]	15,406
Accumulated Depreciation (AD)		(966)
Total Cost Net of Accumulated Depreciation		14,440
Encumbrances		$ 8,214
Chestnut Hall [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Oct. 1, 2006
Property Location		Philadelphia, PA
Year Built		Jan. 1, 1923
Number of apartment homes | Units		315
Initial Cost, Land	[1]	$ 12,338
Initial Cost, Buildings and Improvements	[1]	14,299
Costs Capitalized Subsequent to Consolidation	[2]	10,196
Land		12,338
Buildings and Improvements		24,495
Total	[3]	36,833
Accumulated Depreciation (AD)		(13,517)
Total Cost Net of Accumulated Depreciation		23,316
Encumbrances		$ 38,940
Chestnut Hill Village [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Apr. 1, 2000
Property Location		Philadelphia, PA
Year Built		Jan. 1, 1963
Number of apartment homes | Units		821
Initial Cost, Land	[1]	$ 6,469
Initial Cost, Buildings and Improvements	[1]	49,316
Costs Capitalized Subsequent to Consolidation	[2]	43,542
Land		6,469
Buildings and Improvements		92,858
Total	[3]	99,327
Accumulated Depreciation (AD)		(57,694)
Total Cost Net of Accumulated Depreciation		41,633
Encumbrances		$ 54,374
Chimneys of Cradle Rock [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jun. 1, 2004
Property Location		Columbia, MD
Year Built		Jan. 1, 1979
Number of apartment homes | Units		198
Initial Cost, Land	[1]	$ 2,040
Initial Cost, Buildings and Improvements	[1]	8,108
Costs Capitalized Subsequent to Consolidation	[2]	536
Land		2,040
Buildings and Improvements		8,644
Total	[3]	10,684
Accumulated Depreciation (AD)		(2,889)
Total Cost Net of Accumulated Depreciation		7,795
Encumbrances		$ 15,619
Columbus Avenue [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Sep. 1, 2003
Property Location		New York, NY
Year Built		Jan. 1, 1880
Number of apartment homes | Units		59
Initial Cost, Land	[1]	$ 35,527
Initial Cost, Buildings and Improvements	[1]	9,450
Costs Capitalized Subsequent to Consolidation	[2]	5,137
Land		35,527
Buildings and Improvements		14,587
Total	[3]	50,114
Accumulated Depreciation (AD)		(8,251)
Total Cost Net of Accumulated Depreciation		41,863
Encumbrances		$ 26,853
Creekside [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jan. 1, 2000
Property Location		Denver, CO
Year Built		Jan. 1, 1974
Number of apartment homes | Units		328
Initial Cost, Land	[1]	$ 3,189
Initial Cost, Buildings and Improvements	[1]	12,698
Costs Capitalized Subsequent to Consolidation	[2]	5,882
Land		3,189
Buildings and Improvements		18,580
Total	[3]	21,769
Accumulated Depreciation (AD)		(11,630)
Total Cost Net of Accumulated Depreciation		10,139
Encumbrances		$ 12,021
Crescent at West Hollywood, The [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Mar. 1, 2002
Property Location		West Hollywood, CA
Year Built		Jan. 1, 1985
Number of apartment homes | Units		130
Initial Cost, Land	[1]	$ 15,765
Initial Cost, Buildings and Improvements	[1]	10,215
Costs Capitalized Subsequent to Consolidation	[2]	14,535
Land		15,765
Buildings and Improvements		24,750
Total	[3]	40,515
Accumulated Depreciation (AD)		(17,836)
Total Cost Net of Accumulated Depreciation		22,679
Encumbrances		$ 0
Eastpointe [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Dec. 1, 2014
Property Location		Boulder, CO
Year Built		Jan. 1, 1970
Number of apartment homes | Units		140
Initial Cost, Land	[1]	$ 15,300
Initial Cost, Buildings and Improvements	[1]	2,705
Costs Capitalized Subsequent to Consolidation	[2]	53
Land		15,300
Buildings and Improvements		2,758
Total	[3]	18,058
Accumulated Depreciation (AD)		(98)
Total Cost Net of Accumulated Depreciation		17,960
Encumbrances		$ 0
Elm Creek [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Dec. 1, 1997
Property Location		Elmhurst, IL
Year Built		Jan. 1, 1987
Number of apartment homes | Units		400
Initial Cost, Land	[1]	$ 5,910
Initial Cost, Buildings and Improvements	[1]	30,830
Costs Capitalized Subsequent to Consolidation	[2]	29,904
Land		5,910
Buildings and Improvements		60,734
Total	[3]	66,644
Accumulated Depreciation (AD)		(26,752)
Total Cost Net of Accumulated Depreciation		39,892
Encumbrances		$ 39,940
Evanston Place [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Dec. 1, 1997
Property Location		Evanston, IL
Year Built		Jan. 1, 1990
Number of apartment homes | Units		190
Initial Cost, Land	[1]	$ 3,232
Initial Cost, Buildings and Improvements	[1]	25,546
Costs Capitalized Subsequent to Consolidation	[2]	11,823
Land		3,232
Buildings and Improvements		37,369
Total	[3]	40,601
Accumulated Depreciation (AD)		(16,285)
Total Cost Net of Accumulated Depreciation		24,316
Encumbrances		$ 20,005
Farmingdale [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Oct. 1, 2000
Property Location		Darien, IL
Year Built		Jan. 1, 1975
Number of apartment homes | Units		240
Initial Cost, Land	[1]	$ 11,763
Initial Cost, Buildings and Improvements	[1]	15,174
Costs Capitalized Subsequent to Consolidation	[2]	9,766
Land		11,763
Buildings and Improvements		24,940
Total	[3]	36,703
Accumulated Depreciation (AD)		(11,975)
Total Cost Net of Accumulated Depreciation		24,728
Encumbrances		$ 14,979
Flamingo Towers [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Sep. 1, 1997
Property Location		Miami Beach, FL
Year Built		Jan. 1, 1960
Number of apartment homes | Units		1,227
Initial Cost, Land	[1]	$ 32,430
Initial Cost, Buildings and Improvements	[1]	48,808
Costs Capitalized Subsequent to Consolidation	[2]	267,185
Land		32,434
Buildings and Improvements		315,989
Total	[3]	348,423
Accumulated Depreciation (AD)		(137,704)
Total Cost Net of Accumulated Depreciation		210,719
Encumbrances		$ 109,398
Four Quarters Habitat [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jan. 1, 2006
Property Location		Miami, FL
Year Built		Jan. 1, 1976
Number of apartment homes | Units		336
Initial Cost, Land	[1]	$ 2,379
Initial Cost, Buildings and Improvements	[1]	17,199
Costs Capitalized Subsequent to Consolidation	[2]	20,843
Land		2,379
Buildings and Improvements		38,042
Total	[3]	40,421
Accumulated Depreciation (AD)		(21,879)
Total Cost Net of Accumulated Depreciation		18,542
Encumbrances		$ 6,781
Foxchase [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Dec. 1, 1997
Property Location		Alexandria, VA
Year Built		Jan. 1, 1940
Number of apartment homes | Units		2,113
Initial Cost, Land	[1]	$ 15,496
Initial Cost, Buildings and Improvements	[1]	96,062
Costs Capitalized Subsequent to Consolidation	[2]	38,356
Land		15,496
Buildings and Improvements		134,418
Total	[3]	149,914
Accumulated Depreciation (AD)		(73,312)
Total Cost Net of Accumulated Depreciation		76,602
Encumbrances		$ 237,881
Georgetown [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Aug. 1, 2002
Property Location		Framingham, MA
Year Built		Jan. 1, 1964
Number of apartment homes | Units		207
Initial Cost, Land	[1]	$ 12,351
Initial Cost, Buildings and Improvements	[1]	13,168
Costs Capitalized Subsequent to Consolidation	[2]	2,700
Land		12,351
Buildings and Improvements		15,868
Total	[3]	28,219
Accumulated Depreciation (AD)		(6,769)
Total Cost Net of Accumulated Depreciation		21,450
Encumbrances		$ 7,863
Granada [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Aug. 1, 2002
Property Location		Framingham, MA
Year Built		Jan. 1, 1958
Number of apartment homes | Units		72
Initial Cost, Land	[1]	$ 4,577
Initial Cost, Buildings and Improvements	[1]	4,057
Costs Capitalized Subsequent to Consolidation	[2]	1,252
Land		4,577
Buildings and Improvements		5,309
Total	[3]	9,886
Accumulated Depreciation (AD)		(2,595)
Total Cost Net of Accumulated Depreciation		7,291
Encumbrances		$ 2,634
Grand Pointe [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Dec. 1, 1999
Property Location		Columbia, MD
Year Built		Jan. 1, 1972
Number of apartment homes | Units		325
Initial Cost, Land	[1]	$ 2,714
Initial Cost, Buildings and Improvements	[1]	16,771
Costs Capitalized Subsequent to Consolidation	[2]	5,977
Land		2,714
Buildings and Improvements		22,748
Total	[3]	25,462
Accumulated Depreciation (AD)		(11,931)
Total Cost Net of Accumulated Depreciation		13,531
Encumbrances		$ 0
Heritage Park Escondido [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Oct. 1, 2000
Property Location		Escondido, CA
Year Built		Jan. 1, 1986
Number of apartment homes | Units		196
Initial Cost, Land	[1]	$ 1,055
Initial Cost, Buildings and Improvements	[1]	7,565
Costs Capitalized Subsequent to Consolidation	[2]	1,659
Land		1,055
Buildings and Improvements		9,224
Total	[3]	10,279
Accumulated Depreciation (AD)		(6,112)
Total Cost Net of Accumulated Depreciation		4,167
Encumbrances		$ 6,831
Heritage Park Livermore [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Oct. 1, 2000
Property Location		Livermore, CA
Year Built		Jan. 1, 1988
Number of apartment homes | Units		167
Initial Cost, Land	[1]	$ 0
Initial Cost, Buildings and Improvements	[1]	10,209
Costs Capitalized Subsequent to Consolidation	[2]	1,625
Land		0
Buildings and Improvements		11,834
Total	[3]	11,834
Accumulated Depreciation (AD)		(7,036)
Total Cost Net of Accumulated Depreciation		4,798
Encumbrances		$ 7,060
Heritage Village Anaheim [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Oct. 1, 2000
Property Location		Anaheim, CA
Year Built		Jan. 1, 1986
Number of apartment homes | Units		196
Initial Cost, Land	[1]	$ 1,832
Initial Cost, Buildings and Improvements	[1]	8,541
Costs Capitalized Subsequent to Consolidation	[2]	1,455
Land		1,832
Buildings and Improvements		9,996
Total	[3]	11,828
Accumulated Depreciation (AD)		(6,295)
Total Cost Net of Accumulated Depreciation		5,533
Encumbrances		$ 8,291
Hidden Cove [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jul. 1, 1998
Property Location		Escondido, CA
Year Built		Jan. 1, 1983
Number of apartment homes | Units		334
Initial Cost, Land	[1]	$ 3,043
Initial Cost, Buildings and Improvements	[1]	17,616
Costs Capitalized Subsequent to Consolidation	[2]	10,350
Land		3,043
Buildings and Improvements		27,966
Total	[3]	31,009
Accumulated Depreciation (AD)		(14,817)
Total Cost Net of Accumulated Depreciation		16,192
Encumbrances		$ 35,320
Hidden Cove II [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jul. 1, 2007
Property Location		Escondido, CA
Year Built		Jan. 1, 1986
Number of apartment homes | Units		118
Initial Cost, Land	[1]	$ 12,849
Initial Cost, Buildings and Improvements	[1]	6,530
Costs Capitalized Subsequent to Consolidation	[2]	7,063
Land		12,849
Buildings and Improvements		13,593
Total	[3]	26,442
Accumulated Depreciation (AD)		(7,274)
Total Cost Net of Accumulated Depreciation		19,168
Encumbrances		$ 14,310
Hillcreste [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2002
Property Location		Century City, CA
Year Built		Jan. 1, 1989
Number of apartment homes | Units		315
Initial Cost, Land	[1]	$ 35,862
Initial Cost, Buildings and Improvements	[1]	47,216
Costs Capitalized Subsequent to Consolidation	[2]	18,465
Land		35,862
Buildings and Improvements		65,681
Total	[3]	101,543
Accumulated Depreciation (AD)		(31,011)
Total Cost Net of Accumulated Depreciation		70,532
Encumbrances		$ 67,724
Hillmeade [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Nov. 1, 1994
Property Location		Nashville, TN
Year Built		Jan. 1, 1986
Number of apartment homes | Units		288
Initial Cost, Land	[1]	$ 2,872
Initial Cost, Buildings and Improvements	[1]	16,070
Costs Capitalized Subsequent to Consolidation	[2]	12,287
Land		2,872
Buildings and Improvements		28,357
Total	[3]	31,229
Accumulated Depreciation (AD)		(16,545)
Total Cost Net of Accumulated Depreciation		14,684
Encumbrances		$ 16,307
Horizons West Apartments [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Dec. 1, 2006
Property Location		Pacifica, CA
Year Built		Jan. 1, 1970
Number of apartment homes | Units		78
Initial Cost, Land	[1]	$ 8,887
Initial Cost, Buildings and Improvements	[1]	6,377
Costs Capitalized Subsequent to Consolidation	[2]	2,373
Land		8,887
Buildings and Improvements		8,750
Total	[3]	17,637
Accumulated Depreciation (AD)		(3,752)
Total Cost Net of Accumulated Depreciation		13,885
Encumbrances		$ 0
Hunt Club [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Sep. 1, 2000
Property Location		Gaithersburg, MD
Year Built		Jan. 1, 1986
Number of apartment homes | Units		336
Initial Cost, Land	[1]	$ 17,859
Initial Cost, Buildings and Improvements	[1]	13,149
Costs Capitalized Subsequent to Consolidation	[2]	9,320
Land		17,859
Buildings and Improvements		22,469
Total	[3]	40,328
Accumulated Depreciation (AD)		(11,993)
Total Cost Net of Accumulated Depreciation		28,335
Encumbrances		$ 0
Hunters Chase [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jan. 1, 2001
Property Location		Midlothian, VA
Year Built		Jan. 1, 1985
Number of apartment homes | Units		320
Initial Cost, Land	[1]	$ 7,935
Initial Cost, Buildings and Improvements	[1]	7,915
Costs Capitalized Subsequent to Consolidation	[2]	3,156
Land		7,935
Buildings and Improvements		11,071
Total	[3]	19,006
Accumulated Depreciation (AD)		(5,032)
Total Cost Net of Accumulated Depreciation		13,974
Encumbrances		$ 14,704
Hunters Glen [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Oct. 1, 1999
Property Location		Plainsboro, NJ
Year Built		Jan. 1, 1976
Number of apartment homes | Units		896
Initial Cost, Land	[1]	$ 8,778
Initial Cost, Buildings and Improvements	[1]	47,259
Costs Capitalized Subsequent to Consolidation	[2]	39,501
Land		8,778
Buildings and Improvements		86,760
Total	[3]	95,538
Accumulated Depreciation (AD)		(63,424)
Total Cost Net of Accumulated Depreciation		32,114
Encumbrances		$ 62,228
Hyde Park Tower [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Oct. 1, 2004
Property Location		Chicago, IL
Year Built		Jan. 1, 1990
Number of apartment homes | Units		155
Initial Cost, Land	[1]	$ 4,731
Initial Cost, Buildings and Improvements	[1]	14,927
Costs Capitalized Subsequent to Consolidation	[2]	5,076
Land		4,731
Buildings and Improvements		20,003
Total	[3]	24,734
Accumulated Depreciation (AD)		(5,429)
Total Cost Net of Accumulated Depreciation		19,305
Encumbrances		$ 13,499
Indian Oaks [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2002
Property Location		Simi Valley, CA
Year Built		Jan. 1, 1986
Number of apartment homes | Units		254
Initial Cost, Land	[1]	$ 24,523
Initial Cost, Buildings and Improvements	[1]	15,801
Costs Capitalized Subsequent to Consolidation	[2]	5,323
Land		24,523
Buildings and Improvements		21,124
Total	[3]	45,647
Accumulated Depreciation (AD)		(10,467)
Total Cost Net of Accumulated Depreciation		35,180
Encumbrances		$ 0
Island Club [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Oct. 1, 2000
Property Location		Oceanside, CA
Year Built		Jan. 1, 1986
Number of apartment homes | Units		592
Initial Cost, Land	[1]	$ 18,027
Initial Cost, Buildings and Improvements	[1]	28,654
Costs Capitalized Subsequent to Consolidation	[2]	16,400
Land		18,027
Buildings and Improvements		45,054
Total	[3]	63,081
Accumulated Depreciation (AD)		(27,267)
Total Cost Net of Accumulated Depreciation		35,814
Encumbrances		$ 58,917
Key Towers [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Apr. 1, 2001
Property Location		Alexandria, VA
Year Built		Jan. 1, 1964
Number of apartment homes | Units		140
Initial Cost, Land	[1]	$ 1,526
Initial Cost, Buildings and Improvements	[1]	7,050
Costs Capitalized Subsequent to Consolidation	[2]	6,794
Land		1,526
Buildings and Improvements		13,844
Total	[3]	15,370
Accumulated Depreciation (AD)		(9,988)
Total Cost Net of Accumulated Depreciation		5,382
Encumbrances		$ 9,939
Lakeside [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Oct. 1, 1999
Property Location		Lisle, IL
Year Built		Jan. 1, 1972
Number of apartment homes | Units		568
Initial Cost, Land	[1]	$ 5,840
Initial Cost, Buildings and Improvements	[1]	27,937
Costs Capitalized Subsequent to Consolidation	[2]	32,367
Land		5,840
Buildings and Improvements		60,304
Total	[3]	66,144
Accumulated Depreciation (AD)		(40,623)
Total Cost Net of Accumulated Depreciation		25,521
Encumbrances		$ 26,830
Lakeside at Vinings Mountain [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jan. 1, 2000
Property Location		Atlanta, GA
Year Built		Jan. 1, 1983
Number of apartment homes | Units		220
Initial Cost, Land	[1]	$ 2,111
Initial Cost, Buildings and Improvements	[1]	11,862
Costs Capitalized Subsequent to Consolidation	[2]	15,536
Land		2,111
Buildings and Improvements		27,398
Total	[3]	29,509
Accumulated Depreciation (AD)		(19,806)
Total Cost Net of Accumulated Depreciation		9,703
Encumbrances		$ 13,985
Latrobe [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Jan. 1, 2003
Property Location		Washington, DC
Year Built		Jan. 1, 1980
Number of apartment homes | Units		175
Initial Cost, Land	[1]	$ 3,459
Initial Cost, Buildings and Improvements	[1]	9,103
Costs Capitalized Subsequent to Consolidation	[2]	16,471
Land		3,459
Buildings and Improvements		25,574
Total	[3]	29,033
Accumulated Depreciation (AD)		(17,915)
Total Cost Net of Accumulated Depreciation		11,118
Encumbrances		$ 28,460
Lincoln Place Garden (5) [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type	[5]	Garden
Date Consolidated	[4],[5]	Oct. 1, 2004
Property Location	[5]	Venice, CA
Year Built	[5]	Jan. 1, 1951
Number of apartment homes | Units	[5]	795
Initial Cost, Land	[1],[5]	$ 128,332
Initial Cost, Buildings and Improvements	[1],[5]	10,439
Costs Capitalized Subsequent to Consolidation	[2],[5]	331,935
Land	[5]	44,197
Buildings and Improvements	[5]	342,374
Total	[3],[5]	386,571
Accumulated Depreciation (AD)	[5]	(41,609)
Total Cost Net of Accumulated Depreciation	[5]	344,962
Encumbrances	[5]	$ 197,449
Lodge at Chattahoochee, The [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Oct. 1, 1999
Property Location		Sandy Springs, GA
Year Built		Jan. 1, 1970
Number of apartment homes | Units		312
Initial Cost, Land	[1]	$ 2,335
Initial Cost, Buildings and Improvements	[1]	16,370
Costs Capitalized Subsequent to Consolidation	[2]	20,826
Land		2,335
Buildings and Improvements		37,196
Total	[3]	39,531
Accumulated Depreciation (AD)		(24,539)
Total Cost Net of Accumulated Depreciation		14,992
Encumbrances		$ 20,530
Malibu Canyon [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2002
Property Location		Calabasas, CA
Year Built		Jan. 1, 1986
Number of apartment homes | Units		698
Initial Cost, Land	[1]	$ 69,834
Initial Cost, Buildings and Improvements	[1]	53,438
Costs Capitalized Subsequent to Consolidation	[2]	21,973
Land		69,834
Buildings and Improvements		75,411
Total	[3]	145,245
Accumulated Depreciation (AD)		(36,536)
Total Cost Net of Accumulated Depreciation		108,709
Encumbrances		$ 111,854
Maple Bay [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Dec. 1, 1999
Property Location		Virginia Beach, VA
Year Built		Jan. 1, 1971
Number of apartment homes | Units		414
Initial Cost, Land	[1]	$ 2,597
Initial Cost, Buildings and Improvements	[1]	16,141
Costs Capitalized Subsequent to Consolidation	[2]	28,071
Land		2,597
Buildings and Improvements		44,212
Total	[3]	46,809
Accumulated Depreciation (AD)		(30,732)
Total Cost Net of Accumulated Depreciation		16,077
Encumbrances		$ 0
Mariners Cove [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2002
Property Location		San Diego, CA
Year Built		Jan. 1, 1984
Number of apartment homes | Units		500
Initial Cost, Land	[1]	$ 0
Initial Cost, Buildings and Improvements	[1]	66,861
Costs Capitalized Subsequent to Consolidation	[2]	7,956
Land		0
Buildings and Improvements		74,817
Total	[3]	74,817
Accumulated Depreciation (AD)		(32,476)
Total Cost Net of Accumulated Depreciation		42,341
Encumbrances		$ 0
Meadow Creek [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jul. 1, 1994
Property Location		Boulder, CO
Year Built		Jan. 1, 1968
Number of apartment homes | Units		332
Initial Cost, Land	[1]	$ 1,435
Initial Cost, Buildings and Improvements	[1]	24,533
Costs Capitalized Subsequent to Consolidation	[2]	4,863
Land		1,435
Buildings and Improvements		29,396
Total	[3]	30,831
Accumulated Depreciation (AD)		(15,893)
Total Cost Net of Accumulated Depreciation		14,938
Encumbrances		$ 0
Merrill House [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Jan. 1, 2000
Property Location		Falls Church, VA
Year Built		Jan. 1, 1964
Number of apartment homes | Units		159
Initial Cost, Land	[1]	$ 1,836
Initial Cost, Buildings and Improvements	[1]	10,831
Costs Capitalized Subsequent to Consolidation	[2]	7,558
Land		1,836
Buildings and Improvements		18,389
Total	[3]	20,225
Accumulated Depreciation (AD)		(9,281)
Total Cost Net of Accumulated Depreciation		10,944
Encumbrances		$ 17,911
Mezzo [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Mar. 1, 2015
Property Location		Atlanta, GA
Year Built		Jan. 1, 2008
Number of apartment homes | Units		94
Initial Cost, Land	[1]	$ 4,292
Initial Cost, Buildings and Improvements	[1]	34,178
Costs Capitalized Subsequent to Consolidation	[2]	9
Land		4,292
Buildings and Improvements		34,187
Total	[3]	38,479
Accumulated Depreciation (AD)		(1,153)
Total Cost Net of Accumulated Depreciation		37,326
Encumbrances		$ 24,962
Monterey Grove [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jun. 1, 2008
Property Location		San Jose, CA
Year Built		Jan. 1, 1999
Number of apartment homes | Units		224
Initial Cost, Land	[1]	$ 34,325
Initial Cost, Buildings and Improvements	[1]	21,939
Costs Capitalized Subsequent to Consolidation	[2]	4,178
Land		34,325
Buildings and Improvements		26,117
Total	[3]	60,442
Accumulated Depreciation (AD)		(9,158)
Total Cost Net of Accumulated Depreciation		51,284
Encumbrances		$ 0
Ocean House on Prospect [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Apr. 1, 2013
Property Location		La Jolla, CA
Year Built		Jan. 1, 1970
Number of apartment homes | Units		53
Initial Cost, Land	[1]	$ 12,528
Initial Cost, Buildings and Improvements	[1]	18,805
Costs Capitalized Subsequent to Consolidation	[2]	14,615
Land		12,528
Buildings and Improvements		33,420
Total	[3]	45,948
Accumulated Depreciation (AD)		(684)
Total Cost Net of Accumulated Depreciation		45,264
Encumbrances		$ 13,906
One Canal [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Sep. 1, 2013
Property Location		Boston, MA
Number of apartment homes | Units		310
Initial Cost, Land	[1]	$ 0
Initial Cost, Buildings and Improvements	[1]	15,873
Costs Capitalized Subsequent to Consolidation	[2]	146,811
Land		0
Buildings and Improvements		162,684
Total	[3]	162,684
Accumulated Depreciation (AD)		(1)
Total Cost Net of Accumulated Depreciation		162,683
Encumbrances		$ 86,151
Pacific Bay Vistas (5) [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type	[5]	Garden
Date Consolidated	[4],[5]	Mar. 1, 2001
Property Location	[5]	San Bruno, CA
Year Built	[5]	Jan. 1, 1987
Number of apartment homes | Units	[5]	308
Initial Cost, Land	[1],[5]	$ 28,694
Initial Cost, Buildings and Improvements	[1],[5]	62,460
Costs Capitalized Subsequent to Consolidation	[2],[5]	36,590
Land	[5]	23,354
Buildings and Improvements	[5]	99,050
Total	[3],[5]	122,404
Accumulated Depreciation (AD)	[5]	(14,841)
Total Cost Net of Accumulated Depreciation	[5]	107,563
Encumbrances	[5]	$ 70,356
Pacifica Park [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jul. 1, 2006
Property Location		Pacifica, CA
Year Built		Jan. 1, 1977
Number of apartment homes | Units		104
Initial Cost, Land	[1]	$ 12,970
Initial Cost, Buildings and Improvements	[1]	6,579
Costs Capitalized Subsequent to Consolidation	[2]	4,465
Land		12,970
Buildings and Improvements		11,044
Total	[3]	24,014
Accumulated Depreciation (AD)		(5,001)
Total Cost Net of Accumulated Depreciation		19,013
Encumbrances		$ 11,687
Palazzo at Park La Brea, The [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Feb. 1, 2004
Property Location		Los Angeles, CA
Year Built		Jan. 1, 2002
Number of apartment homes | Units		521
Initial Cost, Land	[1]	$ 48,362
Initial Cost, Buildings and Improvements	[1]	125,464
Costs Capitalized Subsequent to Consolidation	[2]	30,633
Land		48,362
Buildings and Improvements		156,097
Total	[3]	204,459
Accumulated Depreciation (AD)		(65,684)
Total Cost Net of Accumulated Depreciation		138,775
Encumbrances		$ 170,000
Palazzo East at Park La Brea, The [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Mar. 1, 2005
Property Location		Los Angeles, CA
Year Built		Jan. 1, 2005
Number of apartment homes | Units		611
Initial Cost, Land	[1]	$ 72,578
Initial Cost, Buildings and Improvements	[1]	136,503
Costs Capitalized Subsequent to Consolidation	[2]	18,586
Land		72,578
Buildings and Improvements		155,089
Total	[3]	227,667
Accumulated Depreciation (AD)		(61,475)
Total Cost Net of Accumulated Depreciation		166,192
Encumbrances		$ 117,447
Park Towne Place [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Apr. 1, 2000
Property Location		Philadelphia, PA
Year Built		Jan. 1, 1959
Number of apartment homes | Units		948
Initial Cost, Land	[1]	$ 10,472
Initial Cost, Buildings and Improvements	[1]	47,301
Costs Capitalized Subsequent to Consolidation	[2]	213,782
Land		10,472
Buildings and Improvements		261,083
Total	[3]	271,555
Accumulated Depreciation (AD)		(59,556)
Total Cost Net of Accumulated Depreciation		211,999
Encumbrances		$ 0
Parkway [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2000
Property Location		Willamsburg, VA
Year Built		Jan. 1, 1971
Number of apartment homes | Units		148
Initial Cost, Land	[1]	$ 386
Initial Cost, Buildings and Improvements	[1]	2,834
Costs Capitalized Subsequent to Consolidation	[2]	2,757
Land		386
Buildings and Improvements		5,591
Total	[3]	5,977
Accumulated Depreciation (AD)		(3,450)
Total Cost Net of Accumulated Depreciation		2,527
Encumbrances		$ 0
Pathfinder Village [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jan. 1, 2006
Property Location		Fremont, CA
Year Built		Jan. 1, 1973
Number of apartment homes | Units		246
Initial Cost, Land	[1]	$ 19,595
Initial Cost, Buildings and Improvements	[1]	14,838
Costs Capitalized Subsequent to Consolidation	[2]	10,266
Land		19,595
Buildings and Improvements		25,104
Total	[3]	44,699
Accumulated Depreciation (AD)		(11,145)
Total Cost Net of Accumulated Depreciation		33,554
Encumbrances		$ 39,604
Peachtree Park [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jan. 1, 1996
Property Location		Atlanta, GA
Year Built		Jan. 1, 1969
Number of apartment homes | Units		303
Initial Cost, Land	[1]	$ 4,684
Initial Cost, Buildings and Improvements	[1]	11,713
Costs Capitalized Subsequent to Consolidation	[2]	12,506
Land		4,684
Buildings and Improvements		24,219
Total	[3]	28,903
Accumulated Depreciation (AD)		(13,562)
Total Cost Net of Accumulated Depreciation		15,341
Encumbrances		$ 7,301
ERROR in label resolution. | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jan. 1, 2000
Property Location		Atlanta, GA
Year Built		Jan. 1, 1980
Number of apartment homes | Units		280
Initial Cost, Land	[1]	$ 2,651
Initial Cost, Buildings and Improvements	[1]	13,660
Costs Capitalized Subsequent to Consolidation	[2]	18,395
Land		2,651
Buildings and Improvements		32,055
Total	[3]	34,706
Accumulated Depreciation (AD)		(23,516)
Total Cost Net of Accumulated Depreciation		11,190
Encumbrances		$ 14,776
Plantation Gardens [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Oct. 1, 1999
Property Location		Plantation ,FL
Year Built		Jan. 1, 1971
Number of apartment homes | Units		372
Initial Cost, Land	[1]	$ 3,773
Initial Cost, Buildings and Improvements	[1]	19,443
Costs Capitalized Subsequent to Consolidation	[2]	19,344
Land		3,773
Buildings and Improvements		38,787
Total	[3]	42,560
Accumulated Depreciation (AD)		(21,336)
Total Cost Net of Accumulated Depreciation		21,224
Encumbrances		$ 21,737
Post Ridge [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jul. 1, 2000
Property Location		Nashville, TN
Year Built		Jan. 1, 1972
Number of apartment homes | Units		150
Initial Cost, Land	[1]	$ 1,883
Initial Cost, Buildings and Improvements	[1]	6,712
Costs Capitalized Subsequent to Consolidation	[2]	4,557
Land		1,883
Buildings and Improvements		11,269
Total	[3]	13,152
Accumulated Depreciation (AD)		(7,181)
Total Cost Net of Accumulated Depreciation		5,971
Encumbrances		$ 5,465
ERROR in label resolution. | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Aug. 1, 2011
Property Location		Corte Madera, CA
Year Built		Jan. 1, 1964
Number of apartment homes | Units		126
Initial Cost, Land	[1]	$ 18,179
Initial Cost, Buildings and Improvements	[1]	30,132
Costs Capitalized Subsequent to Consolidation	[2]	81,024
Land		18,179
Buildings and Improvements		111,156
Total	[3]	129,335
Accumulated Depreciation (AD)		(7,458)
Total Cost Net of Accumulated Depreciation		121,877
Encumbrances		$ 38,478
Ravensworth Towers [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Jun. 1, 2004
Property Location		Annandale, VA
Year Built		Jan. 1, 1974
Number of apartment homes | Units		219
Initial Cost, Land	[1]	$ 3,455
Initial Cost, Buildings and Improvements	[1]	17,157
Costs Capitalized Subsequent to Consolidation	[2]	3,055
Land		3,455
Buildings and Improvements		20,212
Total	[3]	23,667
Accumulated Depreciation (AD)		(12,328)
Total Cost Net of Accumulated Depreciation		11,339
Encumbrances		$ 21,613
Reflections [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Sep. 1, 2000
Property Location		Virginia Beach, VA
Year Built		Jan. 1, 1987
Number of apartment homes | Units		480
Initial Cost, Land	[1]	$ 15,988
Initial Cost, Buildings and Improvements	[1]	13,684
Costs Capitalized Subsequent to Consolidation	[2]	4,840
Land		15,988
Buildings and Improvements		18,524
Total	[3]	34,512
Accumulated Depreciation (AD)		(9,758)
Total Cost Net of Accumulated Depreciation		24,754
Encumbrances		$ 29,352
River Club, The [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Apr. 1, 2005
Property Location		Edgewater, NJ
Year Built		Jan. 1, 1998
Number of apartment homes | Units		266
Initial Cost, Land	[1]	$ 30,579
Initial Cost, Buildings and Improvements	[1]	30,638
Costs Capitalized Subsequent to Consolidation	[2]	3,783
Land		30,579
Buildings and Improvements		34,421
Total	[3]	65,000
Accumulated Depreciation (AD)		(12,764)
Total Cost Net of Accumulated Depreciation		52,236
Encumbrances		$ 0
Riverloft [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Oct. 1, 1999
Property Location		Philadelphia, PA
Year Built		Jan. 1, 1910
Number of apartment homes | Units		184
Initial Cost, Land	[1]	$ 2,120
Initial Cost, Buildings and Improvements	[1]	11,286
Costs Capitalized Subsequent to Consolidation	[2]	29,301
Land		2,120
Buildings and Improvements		40,587
Total	[3]	42,707
Accumulated Depreciation (AD)		(18,171)
Total Cost Net of Accumulated Depreciation		24,536
Encumbrances		$ 12,495
Riverside [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Apr. 1, 2000
Property Location		Alexandria ,VA
Year Built		Jan. 1, 1973
Number of apartment homes | Units		1,222
Initial Cost, Land	[1]	$ 10,854
Initial Cost, Buildings and Improvements	[1]	65,473
Costs Capitalized Subsequent to Consolidation	[2]	91,415
Land		10,854
Buildings and Improvements		156,888
Total	[3]	167,742
Accumulated Depreciation (AD)		(110,957)
Total Cost Net of Accumulated Depreciation		56,785
Encumbrances		$ 114,639
Rosewood [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2002
Property Location		Camarillo, CA
Year Built		Jan. 1, 1976
Number of apartment homes | Units		152
Initial Cost, Land	[1]	$ 12,430
Initial Cost, Buildings and Improvements	[1]	8,060
Costs Capitalized Subsequent to Consolidation	[2]	3,600
Land		12,430
Buildings and Improvements		11,660
Total	[3]	24,090
Accumulated Depreciation (AD)		(5,475)
Total Cost Net of Accumulated Depreciation		18,615
Encumbrances		$ 16,697
Royal Crest Estates [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Aug. 1, 2002
Property Location		Warwick, RI
Year Built		Jan. 1, 1972
Number of apartment homes | Units		492
Initial Cost, Land	[1]	$ 22,433
Initial Cost, Buildings and Improvements	[1]	24,095
Costs Capitalized Subsequent to Consolidation	[2]	4,365
Land		22,433
Buildings and Improvements		28,460
Total	[3]	50,893
Accumulated Depreciation (AD)		(17,152)
Total Cost Net of Accumulated Depreciation		33,741
Encumbrances		$ 34,670
Royal Crest Estates [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Aug. 1, 2002
Property Location		Nashua, NH
Year Built		Jan. 1, 1970
Number of apartment homes | Units		902
Initial Cost, Land	[1]	$ 68,230
Initial Cost, Buildings and Improvements	[1]	45,562
Costs Capitalized Subsequent to Consolidation	[2]	11,025
Land		68,230
Buildings and Improvements		56,587
Total	[3]	124,817
Accumulated Depreciation (AD)		(36,300)
Total Cost Net of Accumulated Depreciation		88,517
Encumbrances		$ 32,759
Royal Crest Estates [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Aug. 1, 2002
Property Location		Marlborough, MA
Year Built		Jan. 1, 1970
Number of apartment homes | Units		473
Initial Cost, Land	[1]	$ 25,178
Initial Cost, Buildings and Improvements	[1]	28,786
Costs Capitalized Subsequent to Consolidation	[2]	8,731
Land		25,178
Buildings and Improvements		37,517
Total	[3]	62,695
Accumulated Depreciation (AD)		(20,443)
Total Cost Net of Accumulated Depreciation		42,252
Encumbrances		$ 32,188
ERROR in label resolution. | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Aug. 1, 2002
Property Location		North Andover, MA
Year Built		Jan. 1, 1970
Number of apartment homes | Units		588
Initial Cost, Land	[1]	$ 51,292
Initial Cost, Buildings and Improvements	[1]	36,808
Costs Capitalized Subsequent to Consolidation	[2]	21,462
Land		51,292
Buildings and Improvements		58,270
Total	[3]	109,562
Accumulated Depreciation (AD)		(27,517)
Total Cost Net of Accumulated Depreciation		82,045
Encumbrances		$ 0
Savannah Trace [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2001
Property Location		Shaumburg, IL
Year Built		Jan. 1, 1986
Number of apartment homes | Units		368
Initial Cost, Land	[1]	$ 13,960
Initial Cost, Buildings and Improvements	[1]	20,731
Costs Capitalized Subsequent to Consolidation	[2]	5,185
Land		13,960
Buildings and Improvements		25,916
Total	[3]	39,876
Accumulated Depreciation (AD)		(13,367)
Total Cost Net of Accumulated Depreciation		26,509
Encumbrances		$ 24,142
Saybrook Point [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Dec. 1, 2014
Property Location		San Jose, CA
Year Built		Jan. 1, 1995
Number of apartment homes | Units		324
Initial Cost, Land	[1]	$ 32,842
Initial Cost, Buildings and Improvements	[1]	84,457
Costs Capitalized Subsequent to Consolidation	[2]	625
Land		32,842
Buildings and Improvements		85,082
Total	[3]	117,924
Accumulated Depreciation (AD)		(2,957)
Total Cost Net of Accumulated Depreciation		114,967
Encumbrances		$ 64,861
Scotchollow [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jan. 1, 2006
Property Location		San Mateo, CA
Year Built		Jan. 1, 1971
Number of apartment homes | Units		418
Initial Cost, Land	[1]	$ 49,475
Initial Cost, Buildings and Improvements	[1]	17,756
Costs Capitalized Subsequent to Consolidation	[2]	12,635
Land		49,475
Buildings and Improvements		30,391
Total	[3]	79,866
Accumulated Depreciation (AD)		(14,101)
Total Cost Net of Accumulated Depreciation		65,765
Encumbrances		$ 75,749
Shenandoah Crossing [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Sep. 1, 2000
Property Location		Fairfax, VA
Year Built		Jan. 1, 1984
Number of apartment homes | Units		640
Initial Cost, Land	[1]	$ 18,200
Initial Cost, Buildings and Improvements	[1]	57,198
Costs Capitalized Subsequent to Consolidation	[2]	19,746
Land		18,200
Buildings and Improvements		76,944
Total	[3]	95,144
Accumulated Depreciation (AD)		(43,570)
Total Cost Net of Accumulated Depreciation		51,574
Encumbrances		$ 61,964
ERROR in label resolution. | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jul. 1, 2002
Property Location		Woodbridge, VA
Year Built		Jan. 1, 1984
Number of apartment homes | Units		180
Initial Cost, Land	[1]	$ 5,587
Initial Cost, Buildings and Improvements	[1]	7,284
Costs Capitalized Subsequent to Consolidation	[2]	2,857
Land		5,587
Buildings and Improvements		10,141
Total	[3]	15,728
Accumulated Depreciation (AD)		(3,214)
Total Cost Net of Accumulated Depreciation		12,514
Encumbrances		$ 0
Stafford [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Year Built		Jan. 1, 1889
Steeplechase [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Sep. 1, 2000
Property Location		Largo, MD
Year Built		Jan. 1, 1986
Number of apartment homes | Units		240
Initial Cost, Land	[1]	$ 3,675
Initial Cost, Buildings and Improvements	[1]	16,111
Costs Capitalized Subsequent to Consolidation	[2]	4,464
Land		3,675
Buildings and Improvements		20,575
Total	[3]	24,250
Accumulated Depreciation (AD)		(11,298)
Total Cost Net of Accumulated Depreciation		12,952
Encumbrances		$ 0
Sterling Apartment Homes, The [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Oct. 1, 1999
Property Location		Philadelphia, PA
Year Built		Jan. 1, 1961
Number of apartment homes | Units		535
Initial Cost, Land	[1]	$ 8,871
Initial Cost, Buildings and Improvements	[1]	55,365
Costs Capitalized Subsequent to Consolidation	[2]	75,489
Land		8,871
Buildings and Improvements		130,854
Total	[3]	139,725
Accumulated Depreciation (AD)		(49,401)
Total Cost Net of Accumulated Depreciation		90,324
Encumbrances		$ 69,983
Stone Creek Club [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Sep. 1, 2000
Property Location		Germantown, MD
Year Built		Jan. 1, 1984
Number of apartment homes | Units		240
Initial Cost, Land	[1]	$ 13,593
Initial Cost, Buildings and Improvements	[1]	9,347
Costs Capitalized Subsequent to Consolidation	[2]	6,895
Land		13,593
Buildings and Improvements		16,242
Total	[3]	29,835
Accumulated Depreciation (AD)		(10,321)
Total Cost Net of Accumulated Depreciation		19,514
Encumbrances		$ 0
Timbers at Long Reach Apartment Homes [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Apr. 1, 2005
Property Location		Columbia, MD
Year Built		Jan. 1, 1979
Number of apartment homes | Units		178
Initial Cost, Land	[1]	$ 2,430
Initial Cost, Buildings and Improvements	[1]	12,181
Costs Capitalized Subsequent to Consolidation	[2]	496
Land		2,430
Buildings and Improvements		12,677
Total	[3]	15,107
Accumulated Depreciation (AD)		(6,704)
Total Cost Net of Accumulated Depreciation		8,403
Encumbrances		$ 12,896
Towers Of Westchester Park, The [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Jan. 1, 2006
Property Location		College Park, MD
Year Built		Jan. 1, 1972
Number of apartment homes | Units		303
Initial Cost, Land	[1]	$ 15,198
Initial Cost, Buildings and Improvements	[1]	22,029
Costs Capitalized Subsequent to Consolidation	[2]	11,982
Land		15,198
Buildings and Improvements		34,011
Total	[3]	49,209
Accumulated Depreciation (AD)		(13,952)
Total Cost Net of Accumulated Depreciation		35,257
Encumbrances		$ 24,952
Township At Highlands [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Town Home
Date Consolidated	[4]	Nov. 1, 1996
Property Location		Centennial, CO
Year Built		Jan. 1, 1985
Number of apartment homes | Units		161
Initial Cost, Land	[1]	$ 1,536
Initial Cost, Buildings and Improvements	[1]	9,773
Costs Capitalized Subsequent to Consolidation	[2]	6,618
Land		1,536
Buildings and Improvements		16,391
Total	[3]	17,927
Accumulated Depreciation (AD)		(10,131)
Total Cost Net of Accumulated Depreciation		7,796
Encumbrances		$ 14,738
Tremont [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Dec. 1, 2014
Property Location		Atlanta, GA
Year Built		Jan. 1, 2009
Number of apartment homes | Units		78
Initial Cost, Land	[1]	$ 5,274
Initial Cost, Buildings and Improvements	[1]	18,550
Costs Capitalized Subsequent to Consolidation	[2]	530
Land		5,274
Buildings and Improvements		19,080
Total	[3]	24,354
Accumulated Depreciation (AD)		(663)
Total Cost Net of Accumulated Depreciation		23,691
Encumbrances		$ 0
Twin Lake Towers [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Oct. 1, 1999
Property Location		Westmont, IL
Year Built		Jan. 1, 1969
Number of apartment homes | Units		399
Initial Cost, Land	[1]	$ 3,268
Initial Cost, Buildings and Improvements	[1]	18,763
Costs Capitalized Subsequent to Consolidation	[2]	37,876
Land		3,268
Buildings and Improvements		56,639
Total	[3]	59,907
Accumulated Depreciation (AD)		(41,472)
Total Cost Net of Accumulated Depreciation		18,435
Encumbrances		$ 31,110
Vantage Pointe [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Aug. 1, 2002
Property Location		Swampscott, MA
Year Built		Jan. 1, 1987
Number of apartment homes | Units		96
Initial Cost, Land	[1]	$ 4,748
Initial Cost, Buildings and Improvements	[1]	10,089
Costs Capitalized Subsequent to Consolidation	[2]	1,652
Land		4,748
Buildings and Improvements		11,741
Total	[3]	16,489
Accumulated Depreciation (AD)		(4,312)
Total Cost Net of Accumulated Depreciation		12,177
Encumbrances		$ 4,561
Views at Vinings Mountain, The [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jan. 1, 2006
Property Location		Atlanta, GA
Year Built		Jan. 1, 1983
Number of apartment homes | Units		180
Initial Cost, Land	[1]	$ 610
Initial Cost, Buildings and Improvements	[1]	5,026
Costs Capitalized Subsequent to Consolidation	[2]	12,011
Land		610
Buildings and Improvements		17,037
Total	[3]	17,647
Accumulated Depreciation (AD)		(15,466)
Total Cost Net of Accumulated Depreciation		2,181
Encumbrances		$ 0
Villa Del Sol [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2002
Property Location		Norwalk, CA
Year Built		Jan. 1, 1972
Number of apartment homes | Units		120
Initial Cost, Land	[1]	$ 7,476
Initial Cost, Buildings and Improvements	[1]	4,861
Costs Capitalized Subsequent to Consolidation	[2]	2,284
Land		7,476
Buildings and Improvements		7,145
Total	[3]	14,621
Accumulated Depreciation (AD)		(4,044)
Total Cost Net of Accumulated Depreciation		10,577
Encumbrances		$ 11,237
Village of Pennbrook [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Oct. 1, 1998
Property Location		Levittown, PA
Year Built		Jan. 1, 1969
Number of apartment homes | Units		722
Initial Cost, Land	[1]	$ 10,240
Initial Cost, Buildings and Improvements	[1]	38,222
Costs Capitalized Subsequent to Consolidation	[2]	11,293
Land		10,240
Buildings and Improvements		49,515
Total	[3]	59,755
Accumulated Depreciation (AD)		(29,580)
Total Cost Net of Accumulated Depreciation		30,175
Encumbrances		$ 44,021
Villas at Park La Brea, The [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2002
Property Location		Los Angeles, CA
Year Built		Jan. 1, 2002
Number of apartment homes | Units		250
Initial Cost, Land	[1]	$ 8,630
Initial Cost, Buildings and Improvements	[1]	48,871
Costs Capitalized Subsequent to Consolidation	[2]	6,950
Land		8,630
Buildings and Improvements		55,821
Total	[3]	64,451
Accumulated Depreciation (AD)		(25,367)
Total Cost Net of Accumulated Depreciation		39,084
Encumbrances		$ 19,248
Villas of Pasadena [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Jan. 1, 2006
Property Location		Pasadena, CA
Year Built		Jan. 1, 1973
Number of apartment homes | Units		92
Initial Cost, Land	[1]	$ 9,693
Initial Cost, Buildings and Improvements	[1]	6,818
Costs Capitalized Subsequent to Consolidation	[2]	1,978
Land		9,693
Buildings and Improvements		8,796
Total	[3]	18,489
Accumulated Depreciation (AD)		(3,329)
Total Cost Net of Accumulated Depreciation		15,160
Encumbrances		$ 9,689
Waterford Village [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Aug. 1, 2002
Property Location		Bridgewater, MA
Year Built		Jan. 1, 1971
Number of apartment homes | Units		588
Initial Cost, Land	[1]	$ 29,110
Initial Cost, Buildings and Improvements	[1]	28,101
Costs Capitalized Subsequent to Consolidation	[2]	3,161
Land		29,110
Buildings and Improvements		31,262
Total	[3]	60,372
Accumulated Depreciation (AD)		(22,639)
Total Cost Net of Accumulated Depreciation		37,733
Encumbrances		$ 37,394
Waterways Village [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jun. 1, 1997
Property Location		Aventura, FL
Year Built		Jan. 1, 1994
Number of apartment homes | Units		180
Initial Cost, Land	[1]	$ 4,504
Initial Cost, Buildings and Improvements	[1]	11,064
Costs Capitalized Subsequent to Consolidation	[2]	6,180
Land		4,504
Buildings and Improvements		17,244
Total	[3]	21,748
Accumulated Depreciation (AD)		(9,092)
Total Cost Net of Accumulated Depreciation		12,656
Encumbrances		$ 0
Waverly Apartments [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Aug. 1, 2008
Property Location		Brighton, MA
Year Built		Jan. 1, 1970
Number of apartment homes | Units		103
Initial Cost, Land	[1]	$ 7,920
Initial Cost, Buildings and Improvements	[1]	11,347
Costs Capitalized Subsequent to Consolidation	[2]	2,289
Land		7,920
Buildings and Improvements		13,636
Total	[3]	21,556
Accumulated Depreciation (AD)		(4,422)
Total Cost Net of Accumulated Depreciation		17,134
Encumbrances		$ 12,241
Wexford Village [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Aug. 1, 2002
Property Location		Worcester, MA
Year Built		Jan. 1, 1974
Number of apartment homes | Units		264
Initial Cost, Land	[1]	$ 6,349
Initial Cost, Buildings and Improvements	[1]	17,939
Costs Capitalized Subsequent to Consolidation	[2]	1,725
Land		6,349
Buildings and Improvements		19,664
Total	[3]	26,013
Accumulated Depreciation (AD)		(10,694)
Total Cost Net of Accumulated Depreciation		15,319
Encumbrances		$ 9,290
Willow Bend [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	May 1, 1998
Property Location		Rolling Meadows, IL
Year Built		Jan. 1, 1969
Number of apartment homes | Units		328
Initial Cost, Land	[1]	$ 2,717
Initial Cost, Buildings and Improvements	[1]	15,437
Costs Capitalized Subsequent to Consolidation	[2]	26,474
Land		2,717
Buildings and Improvements		41,911
Total	[3]	44,628
Accumulated Depreciation (AD)		(29,319)
Total Cost Net of Accumulated Depreciation		15,309
Encumbrances		$ 18,037
Windrift [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2001
Property Location		Oceanside, CA
Year Built		Jan. 1, 1987
Number of apartment homes | Units		404
Initial Cost, Land	[1]	$ 24,960
Initial Cost, Buildings and Improvements	[1]	17,590
Costs Capitalized Subsequent to Consolidation	[2]	19,074
Land		24,960
Buildings and Improvements		36,664
Total	[3]	61,624
Accumulated Depreciation (AD)		(25,511)
Total Cost Net of Accumulated Depreciation		36,113
Encumbrances		$ 41,084
Windsor Park [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2001
Property Location		Woodbridge, VA
Year Built		Jan. 1, 1987
Number of apartment homes | Units		220
Initial Cost, Land	[1]	$ 4,279
Initial Cost, Buildings and Improvements	[1]	15,970
Costs Capitalized Subsequent to Consolidation	[2]	5,503
Land		4,279
Buildings and Improvements		21,473
Total	[3]	25,752
Accumulated Depreciation (AD)		(10,732)
Total Cost Net of Accumulated Depreciation		15,020
Encumbrances		$ 17,992
Woods of williamsburg [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jan. 1, 2006
Property Location		Williamsburg, VA
Year Built		Jan. 1, 1976
Number of apartment homes | Units		125
Initial Cost, Land	[1]	$ 798
Initial Cost, Buildings and Improvements	[1]	3,657
Costs Capitalized Subsequent to Consolidation	[2]	1,103
Land		798
Buildings and Improvements		4,760
Total	[3]	5,558
Accumulated Depreciation (AD)		(3,930)
Total Cost Net of Accumulated Depreciation		1,628
Encumbrances		$ 0
Yacht Club at Brickell [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Dec. 1, 2003
Property Location		Miami, FL
Year Built		Jan. 1, 1998
Number of apartment homes | Units		357
Initial Cost, Land	[1]	$ 31,362
Initial Cost, Buildings and Improvements	[1]	32,214
Costs Capitalized Subsequent to Consolidation	[2]	9,809
Land		31,362
Buildings and Improvements		42,023
Total	[3]	73,385
Accumulated Depreciation (AD)		(13,309)
Total Cost Net of Accumulated Depreciation		60,076
Encumbrances		$ 47,304
Yorktown Apartments [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Dec. 1, 1999
Property Location		Lombard, IL
Year Built		Jan. 1, 1971
Number of apartment homes | Units		364
Initial Cost, Land	[1]	$ 3,055
Initial Cost, Buildings and Improvements	[1]	18,162
Costs Capitalized Subsequent to Consolidation	[2]	33,837
Land		3,055
Buildings and Improvements		51,999
Total	[3]	55,054
Accumulated Depreciation (AD)		(23,181)
Total Cost Net of Accumulated Depreciation		31,873
Encumbrances		$ 30,328
Total Affordable Properties [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Number of apartment homes | Units		7,998
Initial Cost, Land	[1]	$ 40,170
Initial Cost, Buildings and Improvements	[1]	373,486
Costs Capitalized Subsequent to Consolidation	[2]	357,110
Land		40,171
Buildings and Improvements		724,438
Total	[3]	764,609
Accumulated Depreciation (AD)		(405,408)
Total Cost Net of Accumulated Depreciation		359,201
Encumbrances		$ 331,039
All Hallows [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jan. 1, 2006
Property Location		San Francisco, CA
Year Built		Jan. 1, 1976
Number of apartment homes | Units		157
Initial Cost, Land	[1]	$ 1,338
Initial Cost, Buildings and Improvements	[1]	29,770
Costs Capitalized Subsequent to Consolidation	[2]	21,196
Land		1,338
Buildings and Improvements		50,966
Total	[3]	52,304
Accumulated Depreciation (AD)		(29,359)
Total Cost Net of Accumulated Depreciation		22,945
Encumbrances		$ 22,334
Arvada House [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Nov. 1, 2004
Property Location		Arvada, CO
Year Built		Jan. 1, 1977
Number of apartment homes | Units		88
Initial Cost, Land	[1]	$ 405
Initial Cost, Buildings and Improvements	[1]	3,314
Costs Capitalized Subsequent to Consolidation	[2]	2,289
Land		405
Buildings and Improvements		5,603
Total	[3]	6,008
Accumulated Depreciation (AD)		(2,602)
Total Cost Net of Accumulated Depreciation		3,406
Encumbrances		$ 3,909
Bayview [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jun. 1, 2005
Property Location		San Francisco, CA
Year Built		Jan. 1, 1976
Number of apartment homes | Units		146
Initial Cost, Land	[1]	$ 582
Initial Cost, Buildings and Improvements	[1]	15,265
Costs Capitalized Subsequent to Consolidation	[2]	17,888
Land		582
Buildings and Improvements		33,153
Total	[3]	33,735
Accumulated Depreciation (AD)		(20,987)
Total Cost Net of Accumulated Depreciation		12,748
Encumbrances		$ 11,604
Beacon Hill [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Mar. 1, 2002
Property Location		Hillsdale, MI
Year Built		Jan. 1, 1980
Number of apartment homes | Units		198
Initial Cost, Land	[1]	$ 1,094
Initial Cost, Buildings and Improvements	[1]	7,044
Costs Capitalized Subsequent to Consolidation	[2]	6,171
Land		1,094
Buildings and Improvements		13,215
Total	[3]	14,309
Accumulated Depreciation (AD)		(6,359)
Total Cost Net of Accumulated Depreciation		7,950
Encumbrances		$ 6,774
Biltmore Towers [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Mar. 1, 2002
Property Location		Dayton, OH
Year Built		Jan. 1, 1980
Number of apartment homes | Units		230
Initial Cost, Land	[1]	$ 1,814
Initial Cost, Buildings and Improvements	[1]	6,411
Costs Capitalized Subsequent to Consolidation	[2]	13,114
Land		1,814
Buildings and Improvements		19,525
Total	[3]	21,339
Accumulated Depreciation (AD)		(12,498)
Total Cost Net of Accumulated Depreciation		8,841
Encumbrances		$ 10,257
Butternut Creek [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Jan. 1, 2006
Property Location		Charlotte, MI
Year Built		Jan. 1, 1980
Number of apartment homes | Units		100
Initial Cost, Land	[1]	$ 505
Initial Cost, Buildings and Improvements	[1]	3,617
Costs Capitalized Subsequent to Consolidation	[2]	3,975
Land		505
Buildings and Improvements		7,592
Total	[3]	8,097
Accumulated Depreciation (AD)		(5,851)
Total Cost Net of Accumulated Depreciation		2,246
Encumbrances		$ 4,047
Carriage House [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Dec. 1, 2006
Property Location		Petersburg, VA
Year Built		Jan. 1, 1885
Number of apartment homes | Units		118
Initial Cost, Land	[1]	$ 716
Initial Cost, Buildings and Improvements	[1]	2,886
Costs Capitalized Subsequent to Consolidation	[2]	4,233
Land		716
Buildings and Improvements		7,119
Total	[3]	7,835
Accumulated Depreciation (AD)		(3,923)
Total Cost Net of Accumulated Depreciation		3,912
Encumbrances		$ 1,833
City Line [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2002
Property Location		Newport News, VA
Year Built		Jan. 1, 1976
Number of apartment homes | Units		200
Initial Cost, Land	[1]	$ 500
Initial Cost, Buildings and Improvements	[1]	2,014
Costs Capitalized Subsequent to Consolidation	[2]	7,712
Land		500
Buildings and Improvements		9,726
Total	[3]	10,226
Accumulated Depreciation (AD)		(4,582)
Total Cost Net of Accumulated Depreciation		5,644
Encumbrances		$ 4,324
Copperwood I Apartments [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Apr. 1, 2006
Property Location		The Woodlands, TX
Year Built		Jan. 1, 1980
Number of apartment homes | Units		150
Initial Cost, Land	[1]	$ 383
Initial Cost, Buildings and Improvements	[1]	8,373
Costs Capitalized Subsequent to Consolidation	[2]	5,901
Land		383
Buildings and Improvements		8,117
Total	[3]	8,500
Accumulated Depreciation (AD)		(6,142)
Total Cost Net of Accumulated Depreciation		2,358
Encumbrances		$ 5,156
Copperwood II Apartments [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Oct. 1, 2005
Property Location		The Woodlands, TX
Year Built		Jan. 1, 1981
Number of apartment homes | Units		150
Initial Cost, Land	[1]	$ 459
Initial Cost, Buildings and Improvements	[1]	5,553
Costs Capitalized Subsequent to Consolidation	[2]	3,647
Land		459
Buildings and Improvements		9,200
Total	[3]	9,659
Accumulated Depreciation (AD)		(5,442)
Total Cost Net of Accumulated Depreciation		4,217
Encumbrances		$ 5,320
Country Club Heights [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2004
Property Location		Quincy, IL
Year Built		Jan. 1, 1976
Number of apartment homes | Units		200
Initial Cost, Land	[1]	$ 676
Initial Cost, Buildings and Improvements	[1]	5,715
Costs Capitalized Subsequent to Consolidation	[2]	5,113
Land		676
Buildings and Improvements		10,828
Total	[3]	11,504
Accumulated Depreciation (AD)		(6,097)
Total Cost Net of Accumulated Depreciation		5,407
Encumbrances		$ 5,472
Crevenna Oaks [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Town Home
Date Consolidated	[4]	Jan. 1, 2006
Property Location		Burke, VA
Year Built		Jan. 1, 1979
Number of apartment homes | Units		50
Initial Cost, Land	[1]	$ 0
Initial Cost, Buildings and Improvements	[1]	5,203
Costs Capitalized Subsequent to Consolidation	[2]	437
Land		0
Buildings and Improvements		5,640
Total	[3]	5,640
Accumulated Depreciation (AD)		(3,181)
Total Cost Net of Accumulated Depreciation		2,459
Encumbrances		$ 2,492
Fountain Place [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Jan. 1, 2006
Property Location		Connersville, IN
Year Built		Jan. 1, 1980
Number of apartment homes | Units		102
Initial Cost, Land	[1]	$ 378
Initial Cost, Buildings and Improvements	[1]	2,091
Costs Capitalized Subsequent to Consolidation	[2]	3,205
Land		378
Buildings and Improvements		5,296
Total	[3]	5,674
Accumulated Depreciation (AD)		(2,046)
Total Cost Net of Accumulated Depreciation		3,628
Encumbrances		$ 918
Hopkins Village [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Sep. 1, 2003
Property Location		Baltimore, MD
Year Built		Jan. 1, 1979
Number of apartment homes | Units		165
Initial Cost, Land	[1]	$ 549
Initial Cost, Buildings and Improvements	[1]	5,973
Costs Capitalized Subsequent to Consolidation	[2]	3,821
Land		549
Buildings and Improvements		9,794
Total	[3]	10,343
Accumulated Depreciation (AD)		(4,406)
Total Cost Net of Accumulated Depreciation		5,937
Encumbrances		$ 9,100
Ingram Square [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jan. 1, 2006
Property Location		San Antonio, TX
Year Built		Jan. 1, 1980
Number of apartment homes | Units		120
Initial Cost, Land	[1]	$ 800
Initial Cost, Buildings and Improvements	[1]	3,136
Costs Capitalized Subsequent to Consolidation	[2]	5,899
Land		800
Buildings and Improvements		9,035
Total	[3]	9,835
Accumulated Depreciation (AD)		(5,559)
Total Cost Net of Accumulated Depreciation		4,276
Encumbrances		$ 3,251
Kirkwood House [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Sep. 1, 2004
Property Location		Baltimore, MD
Year Built		Jan. 1, 1979
Number of apartment homes | Units		261
Initial Cost, Land	[1]	$ 1,337
Initial Cost, Buildings and Improvements	[1]	9,358
Costs Capitalized Subsequent to Consolidation	[2]	9,053
Land		1,337
Buildings and Improvements		18,411
Total	[3]	19,748
Accumulated Depreciation (AD)		(8,568)
Total Cost Net of Accumulated Depreciation		11,180
Encumbrances		$ 16,000
La Salle [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Oct. 1, 2000
Property Location		San Francisco, CA
Year Built		Jan. 1, 1976
Number of apartment homes | Units		145
Initial Cost, Land	[1]	$ 1,866
Initial Cost, Buildings and Improvements	[1]	19,567
Costs Capitalized Subsequent to Consolidation	[2]	17,969
Land		1,866
Buildings and Improvements		37,536
Total	[3]	39,402
Accumulated Depreciation (AD)		(25,603)
Total Cost Net of Accumulated Depreciation		13,799
Encumbrances		$ 17,522
La Vista [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jan. 1, 2006
Property Location		Concord, CA
Year Built		Jan. 1, 1981
Number of apartment homes | Units		75
Initial Cost, Land	[1]	$ 581
Initial Cost, Buildings and Improvements	[1]	4,449
Costs Capitalized Subsequent to Consolidation	[2]	4,668
Land		581
Buildings and Improvements		9,117
Total	[3]	9,698
Accumulated Depreciation (AD)		(3,772)
Total Cost Net of Accumulated Depreciation		5,926
Encumbrances		$ 4,950
Loring Towers [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Oct. 1, 2002
Property Location		Minneapolis, MN
Year Built		Jan. 1, 1975
Number of apartment homes | Units		230
Initial Cost, Land	[1]	$ 886
Initial Cost, Buildings and Improvements	[1]	7,445
Costs Capitalized Subsequent to Consolidation	[2]	8,220
Land		886
Buildings and Improvements		15,665
Total	[3]	16,551
Accumulated Depreciation (AD)		(7,613)
Total Cost Net of Accumulated Depreciation		8,938
Encumbrances		$ 9,578
Loring Towers Apartments [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Sep. 1, 2003
Property Location		Salem, MA
Year Built		Jan. 1, 1973
Number of apartment homes | Units		250
Initial Cost, Land	[1]	$ 187
Initial Cost, Buildings and Improvements	[1]	14,050
Costs Capitalized Subsequent to Consolidation	[2]	7,940
Land		187
Buildings and Improvements		21,990
Total	[3]	22,177
Accumulated Depreciation (AD)		(10,106)
Total Cost Net of Accumulated Depreciation		12,071
Encumbrances		$ 9,978
New Baltimore [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Mar. 1, 2002
Property Location		New Baltimore, MI
Year Built		Jan. 1, 1980
Number of apartment homes | Units		101
Initial Cost, Land	[1]	$ 896
Initial Cost, Buildings and Improvements	[1]	2,360
Costs Capitalized Subsequent to Consolidation	[2]	5,311
Land		896
Buildings and Improvements		7,671
Total	[3]	8,567
Accumulated Depreciation (AD)		(4,208)
Total Cost Net of Accumulated Depreciation		4,359
Encumbrances		$ 1,982
Northpoint [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jan. 1, 2000
Property Location		Chicago, IL
Year Built		Jan. 1, 1921
Number of apartment homes | Units		304
Initial Cost, Land	[1]	$ 2,510
Initial Cost, Buildings and Improvements	[1]	14,334
Costs Capitalized Subsequent to Consolidation	[2]	15,511
Land		2,510
Buildings and Improvements		29,845
Total	[3]	32,355
Accumulated Depreciation (AD)		(21,599)
Total Cost Net of Accumulated Depreciation		10,756
Encumbrances		$ 17,580
Panorama Park [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2002
Property Location		Bakersfield, CA
Year Built		Jan. 1, 1982
Number of apartment homes | Units		66
Initial Cost, Land	[1]	$ 521
Initial Cost, Buildings and Improvements	[1]	5,520
Costs Capitalized Subsequent to Consolidation	[2]	1,210
Land		521
Buildings and Improvements		6,730
Total	[3]	7,251
Accumulated Depreciation (AD)		(3,547)
Total Cost Net of Accumulated Depreciation		3,704
Encumbrances		$ 1,790
Park Place [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Jun. 1, 2005
Property Location		St Louis, MO
Year Built		Jan. 1, 1977
Number of apartment homes | Units		242
Initial Cost, Land	[1]	$ 705
Initial Cost, Buildings and Improvements	[1]	6,327
Costs Capitalized Subsequent to Consolidation	[2]	8,260
Land		705
Buildings and Improvements		14,587
Total	[3]	15,292
Accumulated Depreciation (AD)		(10,771)
Total Cost Net of Accumulated Depreciation		4,521
Encumbrances		$ 8,524
Parkways, The [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jun. 1, 2004
Property Location		Chicago, IL
Year Built		Jan. 1, 1925
Number of apartment homes | Units		446
Initial Cost, Land	[1]	$ 3,426
Initial Cost, Buildings and Improvements	[1]	23,257
Costs Capitalized Subsequent to Consolidation	[2]	20,768
Land		3,426
Buildings and Improvements		44,025
Total	[3]	47,451
Accumulated Depreciation (AD)		(25,348)
Total Cost Net of Accumulated Depreciation		22,103
Encumbrances		$ 16,953
Pavilion [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Mar. 1, 2004
Property Location		Philadelphia, PA
Year Built		Jan. 1, 1976
Number of apartment homes | Units		296
Initial Cost, Land	[1]	$ 0
Initial Cost, Buildings and Improvements	[1]	15,415
Costs Capitalized Subsequent to Consolidation	[2]	2,308
Land		0
Buildings and Improvements		17,723
Total	[3]	17,723
Accumulated Depreciation (AD)		(9,034)
Total Cost Net of Accumulated Depreciation		8,689
Encumbrances		$ 6,585
Pleasant Hills [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Apr. 1, 2005
Property Location		Austin, TX
Year Built		Jan. 1, 1982
Number of apartment homes | Units		100
Initial Cost, Land	[1]	$ 1,229
Initial Cost, Buildings and Improvements	[1]	2,631
Costs Capitalized Subsequent to Consolidation	[2]	3,859
Land		1,229
Buildings and Improvements		6,490
Total	[3]	7,719
Accumulated Depreciation (AD)		(3,763)
Total Cost Net of Accumulated Depreciation		3,956
Encumbrances		$ 2,951
Plummer Village [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Mar. 1, 2002
Property Location		North Hills, CA
Year Built		Jan. 1, 1983
Number of apartment homes | Units		75
Initial Cost, Land	[1]	$ 666
Initial Cost, Buildings and Improvements	[1]	2,647
Costs Capitalized Subsequent to Consolidation	[2]	1,313
Land		666
Buildings and Improvements		3,960
Total	[3]	4,626
Accumulated Depreciation (AD)		(2,634)
Total Cost Net of Accumulated Depreciation		1,992
Encumbrances		$ 2,336
Riverwoods [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Jan. 1, 2006
Property Location		Kankakee, IL
Year Built		Jan. 1, 1983
Number of apartment homes | Units		125
Initial Cost, Land	[1]	$ 598
Initial Cost, Buildings and Improvements	[1]	4,931
Costs Capitalized Subsequent to Consolidation	[2]	3,628
Land		598
Buildings and Improvements		8,559
Total	[3]	9,157
Accumulated Depreciation (AD)		(3,642)
Total Cost Net of Accumulated Depreciation		5,515
Encumbrances		$ 3,493
Round Barn Manor [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2002
Property Location		Champaign, IL
Year Built		Jan. 1, 1979
Number of apartment homes | Units		156
Initial Cost, Land	[1]	$ 810
Initial Cost, Buildings and Improvements	[1]	5,134
Costs Capitalized Subsequent to Consolidation	[2]	6,130
Land		810
Buildings and Improvements		11,264
Total	[3]	12,074
Accumulated Depreciation (AD)		(4,111)
Total Cost Net of Accumulated Depreciation		7,963
Encumbrances		$ 4,210
San Jose Apartments [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Sep. 1, 2005
Property Location		San Antonio, TX
Year Built		Jan. 1, 1970
Number of apartment homes | Units		220
Initial Cost, Land	[1]	$ 234
Initial Cost, Buildings and Improvements	[1]	5,770
Costs Capitalized Subsequent to Consolidation	[2]	12,398
Land		234
Buildings and Improvements		18,168
Total	[3]	18,402
Accumulated Depreciation (AD)		(9,917)
Total Cost Net of Accumulated Depreciation		8,485
Encumbrances		$ 4,358
San Juan Del Centro [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Sep. 1, 2005
Property Location		Boulder, CO
Year Built		Jan. 1, 1971
Number of apartment homes | Units		150
Initial Cost, Land	[1]	$ 439
Initial Cost, Buildings and Improvements	[1]	7,110
Costs Capitalized Subsequent to Consolidation	[2]	13,147
Land		439
Buildings and Improvements		20,257
Total	[3]	20,696
Accumulated Depreciation (AD)		(10,729)
Total Cost Net of Accumulated Depreciation		9,967
Encumbrances		$ 11,707
Shoreview [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Oct. 1, 1999
Property Location		San Francisco, CA
Year Built		Jan. 1, 1976
Number of apartment homes | Units		156
Initial Cost, Land	[1]	$ 1,476
Initial Cost, Buildings and Improvements	[1]	19,071
Costs Capitalized Subsequent to Consolidation	[2]	19,803
Land		1,476
Buildings and Improvements		38,874
Total	[3]	40,350
Accumulated Depreciation (AD)		(27,030)
Total Cost Net of Accumulated Depreciation		13,320
Encumbrances		$ 18,957
South Bay Villa [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Mar. 1, 2002
Property Location		Los Angeles, CA
Year Built		Jan. 1, 1981
Number of apartment homes | Units		80
Initial Cost, Land	[1]	$ 1,352
Initial Cost, Buildings and Improvements	[1]	2,770
Costs Capitalized Subsequent to Consolidation	[2]	3,556
Land		1,352
Buildings and Improvements		6,326
Total	[3]	7,678
Accumulated Depreciation (AD)		(5,205)
Total Cost Net of Accumulated Depreciation		2,473
Encumbrances		$ 2,752
St. George Villas [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Jan. 1, 2006
Property Location		St. George, SC
Year Built		Jan. 1, 1984
Number of apartment homes | Units		40
Initial Cost, Land	[1]	$ 107
Initial Cost, Buildings and Improvements	[1]	1,025
Costs Capitalized Subsequent to Consolidation	[2]	382
Land		107
Buildings and Improvements		1,407
Total	[3]	1,514
Accumulated Depreciation (AD)		(1,140)
Total Cost Net of Accumulated Depreciation		374
Encumbrances		$ 378
Stonegate Apts [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Jul. 1, 2009
Property Location		Indianapolis, IN
Year Built		Jan. 1, 1920
Number of apartment homes | Units		52
Initial Cost, Land	[1]	$ 122
Initial Cost, Buildings and Improvements	[1]	1,920
Costs Capitalized Subsequent to Consolidation	[2]	764
Land		122
Buildings and Improvements		2,684
Total	[3]	2,806
Accumulated Depreciation (AD)		(1,478)
Total Cost Net of Accumulated Depreciation		1,328
Encumbrances		$ 1,799
Summit Oaks [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Town Home
Date Consolidated	[4]	Jan. 1, 2006
Property Location		Burke, VA
Year Built		Jan. 1, 1980
Number of apartment homes | Units		50
Initial Cost, Land	[1]	$ 0
Initial Cost, Buildings and Improvements	[1]	5,311
Costs Capitalized Subsequent to Consolidation	[2]	444
Land		0
Buildings and Improvements		5,755
Total	[3]	5,755
Accumulated Depreciation (AD)		(3,070)
Total Cost Net of Accumulated Depreciation		2,685
Encumbrances		$ 2,478
Tamarac Pines Apartments I [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Nov. 1, 2004
Property Location		Woodlands, TX
Year Built		Jan. 1, 1980
Number of apartment homes | Units		144
Initial Cost, Land	[1]	$ 363
Initial Cost, Buildings and Improvements	[1]	2,775
Costs Capitalized Subsequent to Consolidation	[2]	3,366
Land		363
Buildings and Improvements		6,141
Total	[3]	6,504
Accumulated Depreciation (AD)		(3,396)
Total Cost Net of Accumulated Depreciation		3,108
Encumbrances		$ 3,692
Tamarac Pines Apartments II [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Nov. 1, 2004
Property Location		Woodlands, TX
Year Built		Jan. 1, 1980
Number of apartment homes | Units		156
Initial Cost, Land	[1]	$ 266
Initial Cost, Buildings and Improvements	[1]	3,195
Costs Capitalized Subsequent to Consolidation	[2]	4,020
Land		266
Buildings and Improvements		7,215
Total	[3]	7,481
Accumulated Depreciation (AD)		(3,918)
Total Cost Net of Accumulated Depreciation		3,563
Encumbrances		$ 4,000
Terry Manor [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Oct. 1, 2005
Property Location		Los Angeles, CA
Year Built		Jan. 1, 1977
Number of apartment homes | Units		170
Initial Cost, Land	[1]	$ 1,997
Initial Cost, Buildings and Improvements	[1]	5,848
Costs Capitalized Subsequent to Consolidation	[2]	5,265
Land		1,997
Buildings and Improvements		11,113
Total	[3]	13,110
Accumulated Depreciation (AD)		(8,419)
Total Cost Net of Accumulated Depreciation		4,691
Encumbrances		$ 6,254
Tompkins Terrace [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Oct. 1, 2002
Property Location		Beacon, NY
Year Built		Jan. 1, 1974
Number of apartment homes | Units		193
Initial Cost, Land	[1]	$ 872
Initial Cost, Buildings and Improvements	[1]	6,827
Costs Capitalized Subsequent to Consolidation	[2]	14,306
Land		872
Buildings and Improvements		21,133
Total	[3]	22,005
Accumulated Depreciation (AD)		(10,200)
Total Cost Net of Accumulated Depreciation		11,805
Encumbrances		$ 6,613
University Square [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Mar. 1, 2005
Property Location		Philadelphia, PA
Year Built		Jan. 1, 1978
Number of apartment homes | Units		442
Initial Cost, Land	[1]	$ 702
Initial Cost, Buildings and Improvements	[1]	12,201
Costs Capitalized Subsequent to Consolidation	[2]	13,014
Land		702
Buildings and Improvements		25,215
Total	[3]	25,917
Accumulated Depreciation (AD)		(8,788)
Total Cost Net of Accumulated Depreciation		17,129
Encumbrances		$ 0
Van Nuys Apartments [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Mar. 1, 2002
Property Location		Los Angeles, CA
Year Built		Jan. 1, 1981
Number of apartment homes | Units		299
Initial Cost, Land	[1]	$ 3,576
Initial Cost, Buildings and Improvements	[1]	21,226
Costs Capitalized Subsequent to Consolidation	[2]	23,543
Land		3,576
Buildings and Improvements		44,769
Total	[3]	48,345
Accumulated Depreciation (AD)		(18,832)
Total Cost Net of Accumulated Depreciation		29,513
Encumbrances		$ 24,151
Wah Luck House [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Jan. 1, 2006
Property Location		Washington, DC
Year Built		Jan. 1, 1982
Number of apartment homes | Units		153
Initial Cost, Land	[1]	$ 0
Initial Cost, Buildings and Improvements	[1]	7,772
Costs Capitalized Subsequent to Consolidation	[2]	661
Land		0
Buildings and Improvements		8,433
Total	[3]	8,433
Accumulated Depreciation (AD)		(2,922)
Total Cost Net of Accumulated Depreciation		5,511
Encumbrances		$ 5,457
Walnut Hills [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Jan. 1, 2006
Property Location		Cincinnati, OH
Year Built		Jan. 1, 1983
Number of apartment homes | Units		198
Initial Cost, Land	[1]	$ 826
Initial Cost, Buildings and Improvements	[1]	5,608
Costs Capitalized Subsequent to Consolidation	[2]	5,635
Land		820
Buildings and Improvements		11,249
Total	[3]	12,069
Accumulated Depreciation (AD)		(5,613)
Total Cost Net of Accumulated Depreciation		6,456
Encumbrances		$ 5,117
Washington Square West [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Mid Rise
Date Consolidated	[4]	Sep. 1, 2004
Property Location		Philadelphia, PA
Year Built		Jan. 1, 1982
Number of apartment homes | Units		132
Initial Cost, Land	[1]	$ 582
Initial Cost, Buildings and Improvements	[1]	11,169
Costs Capitalized Subsequent to Consolidation	[2]	5,273
Land		582
Buildings and Improvements		16,442
Total	[3]	17,024
Accumulated Depreciation (AD)		(11,093)
Total Cost Net of Accumulated Depreciation		5,931
Encumbrances		$ 3,474
Whitefield Place [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Apr. 1, 2005
Property Location		San Antonio, TX
Year Built		Jan. 1, 1980
Number of apartment homes | Units		80
Initial Cost, Land	[1]	$ 219
Initial Cost, Buildings and Improvements	[1]	3,151
Costs Capitalized Subsequent to Consolidation	[2]	2,128
Land		219
Buildings and Improvements		5,279
Total	[3]	5,498
Accumulated Depreciation (AD)		(2,989)
Total Cost Net of Accumulated Depreciation		2,509
Encumbrances		$ 2,028
Winter Gardens [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		High Rise
Date Consolidated	[4]	Mar. 1, 2004
Property Location		St Louis, MO
Year Built		Jan. 1, 1920
Number of apartment homes | Units		112
Initial Cost, Land	[1]	$ 300
Initial Cost, Buildings and Improvements	[1]	3,072
Costs Capitalized Subsequent to Consolidation	[2]	4,706
Land		300
Buildings and Improvements		7,778
Total	[3]	8,078
Accumulated Depreciation (AD)		(2,654)
Total Cost Net of Accumulated Depreciation		5,424
Encumbrances		$ 3,336
Woodland Hills [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property Type		Garden
Date Consolidated	[4]	Oct. 1, 2005
Property Location		Jackson, MI
Year Built		Jan. 1, 1980
Number of apartment homes | Units		125
Initial Cost, Land	[1]	$ 320
Initial Cost, Buildings and Improvements	[1]	3,875
Costs Capitalized Subsequent to Consolidation	[2]	3,950
Land		327
Buildings and Improvements		7,818
Total	[3]	8,145
Accumulated Depreciation (AD)		(4,662)
Total Cost Net of Accumulated Depreciation		3,483
Encumbrances		$ 3,265
Other [Member] | Continuing Operations [Member]
Real Estate and Accumulated Depreciation [Line Items]
Number of apartment homes | Units	[6]	0
Initial Cost, Land	[1],[6]	$ 76,034
Initial Cost, Buildings and Improvements	[1],[6]	10,474
Costs Capitalized Subsequent to Consolidation	[2],[6]	384
Land	[6]	76,034
Buildings and Improvements	[6]	10,858
Total	[3],[6]	86,892
Accumulated Depreciation (AD)	[6]	(1,366)
Total Cost Net of Accumulated Depreciation	[6]	85,526
Encumbrances	[6]	$ 0
[1]	For 2008 and prior periods, costs to acquire the noncontrolling interest’s share of our consolidated real estate partnerships were capitalized as part of the initial cost.
[2]	Costs capitalized subsequent to consolidation includes costs capitalized since acquisition or first consolidation of the partnership/apartment community.
[3]	The aggregate cost of land and depreciable property for Federal income tax purposes was approximately $3.8 billion at December 31, 2015.
[4]	Date we acquired the apartment community or first consolidated the partnership which owns the apartment community.
[5]	The current carrying value of the apartment community reflects an impairment loss recognized during the current period or prior periods.
[6]	Other includes land parcels, commercial properties and other related costs. We exclude such properties from our residential apartment home counts

Real Estate and Accumulated D92

Real Estate and Accumulated Depreciation - (Details 1) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Real Estate
Balance at beginning of year		$ 8,144,958	$ 8,214,081	$ 8,333,419
Additions during the year:
Acquisitions		147,077	379,187	66,058
Capital additions		362,948	367,454	376,038
Deductions during the year:
Casualty and other write-offs	[1]	(79,561)	(111,068)	(98,489)
SEC Schedule III, Real Estate, Held For Sale		(7,036)	(38,744)	0
Sales		(260,903)	(665,952)	(462,945)
Balance at end of year		8,307,483	8,144,958	8,214,081
Accumulated Depreciation
Balance at beginning of year		2,672,179	2,822,872	2,820,765
Additions during the year
Depreciation		285,514	265,060	288,666
Deductions during the year:
Casualty and other write-offs	[1]	(78,838)	(106,802)	(92,775)
SEC Schedule III, Accumulated Depreciation, Held For Sale		(4,427)	(12,304)	0
Sales		(96,406)	(296,647)	(193,784)
Balance at end of year		2,778,022	2,672,179	2,822,872
Write-off of fully depreciated assets		$ 76,900	$ 106,300	$ 91,900
[1]	Includes the write-off of fully depreciated assets totaling $76.9 million, $106.3 million and $91.9 million, during the years ended December 31, 2015, 2014 and 2013