Equity Residential (EQR) 10-K 21 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2018	Feb. 15, 2019	Jun. 30, 2018
Document And Entity Information [Line Items]
Entity Registrant Name	EQUITY RESIDENTIAL
Entity Central Index Key	906,107
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Amendment Flag	false
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Trading Symbol	EQR
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 Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Public Float			$ 23.1
Entity Common Stock, Shares Outstanding		369,933,743
ERPOP [Member]
Document And Entity Information [Line Items]
Entity Registrant Name	ERP OPERATING LIMITED PARTNERSHIP
Entity Central Index Key	931,182
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Amendment Flag	false
Document Fiscal Year Focus	2,018
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	Non-accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Land	$ 5,875,803	$ 5,996,024
Depreciable property	20,435,901	19,768,362
Projects under development	109,409	163,547
Land held for development	89,909	98,963
Investment in real estate	26,511,022	26,026,896
Accumulated depreciation	(6,696,281)	(6,040,378)
Investment in real estate, net	19,814,741	19,986,518
Investments in unconsolidated entities	58,349	58,254
Cash and cash equivalents	47,442	50,647
Restricted deposits	68,871	50,115
Other assets	404,806	425,065
Total assets	20,394,209	20,570,599
Liabilities:
Mortgage notes payable, net	2,385,470	3,618,722
Notes, net	5,933,286	5,038,812
Line of credit and commercial paper	499,183	299,757
Accounts payable and accrued expenses	102,471	114,766
Accrued interest payable	62,622	58,035
Other liabilities	358,563	341,852
Security deposits	67,258	65,009
Distributions payable	206,601	192,828
Total liabilities	9,615,454	9,729,781
Commitments and contingencies
Redeemable Noncontrolling Interests – Operating Partnership	379,106	366,955
Shareholders’ equity:
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized; 745,600 shares issued and outstanding as of December 31, 2018 and December 31, 2017	37,280	37,280
Common Shares of beneficial interest, $0.01 par value; 1,000,000,000 shares authorized; 369,405,161 shares issued and outstanding as of December 31, 2018 and 368,018,082 shares issued and outstanding as of December 31, 2017	3,694	3,680
Paid in capital	8,935,453	8,886,586
Retained earnings	1,261,763	1,403,530
Accumulated other comprehensive income (loss)	(64,986)	(88,612)
Total shareholders’ equity	10,173,204	10,242,464
Noncontrolling Interests:
Operating Partnership	228,738	226,691
Partially Owned Properties	(2,293)	4,708
Total Noncontrolling Interests	226,445	231,399
Total equity	10,399,649	10,473,863
Total liabilities and equity/capital	$ 20,394,209	$ 20,570,599

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	100,000,000	100,000,000
Preferred Stock, Shares Issued	745,600	745,600
Preferred Stock, Shares Outstanding	745,600	745,600
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	1,000,000,000	1,000,000,000
Common Stock, Shares, Issued	369,405,161	368,018,082
Common Stock, Shares, Outstanding	369,405,161	368,018,082

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
REVENUES
Rental income	$ 2,577,681	$ 2,470,689	$ 2,422,233
Fee and asset management	$ 753	$ 717	$ 3,567
Type of Revenue [Extensible List]	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember
Total revenues	$ 2,578,434	$ 2,471,406	$ 2,425,800
EXPENSES
Property and maintenance	429,335	405,281	406,823
Real estate taxes and insurance	357,814	335,495	317,387
Property management	92,485	85,493	82,015
General and administrative	53,813	52,224	57,840
Depreciation	785,725	743,749	705,649
Impairment	702	1,693	0
Total expenses	1,719,874	1,623,935	1,569,714
Operating income	858,560	847,471	856,086
Interest and other income	15,317	6,136	65,773
Other expenses	(17,267)	(5,186)	(10,368)
Interest:
Expense incurred, net	(413,360)	(383,890)	(482,246)
Amortization of deferred financing costs	(11,310)	(8,526)	(12,633)
Income before income and other taxes, income (loss) from investments in unconsolidated entities, net gain (loss) on sales of real estate properties and land parcels and discontinued operations	431,940	456,005	416,612
Income and other tax (expense) benefit	(878)	(478)	(1,613)
Income (loss) from investments in unconsolidated entities	(3,667)	(3,370)	4,801
Net gain (loss) on sales of real estate properties	256,810	157,057	4,044,055
Net gain (loss) on sales of land parcels	987	19,167	15,731
Income from continuing operations	685,192	628,381	4,479,586
Discontinued operations, net	0	0	518
Net income	685,192	628,381	4,480,104
Net (income) loss attributable to Noncontrolling Interests:
Operating Partnership	(24,939)	(22,604)	(171,511)
Partially Owned Properties	(2,718)	(2,323)	(16,430)
Net income attributable to controlling interests	657,535	603,454	4,292,163
Preferred distributions	(3,090)	(3,091)	(3,091)
Net income available to Common Shares	$ 654,445	$ 600,363	$ 4,289,072
Earnings per share – basic:
Income from continuing operations available to Common Shares	$ 1.78	$ 1.64	$ 11.75
Net income available to Common Shares	$ 1.78	$ 1.64	$ 11.75
Weighted average Common Shares outstanding	368,052	366,968	365,002
Earnings per share – diluted:
Income from continuing operations available to Common Shares	$ 1.77	$ 1.63	$ 11.68
Net income available to Common Shares	$ 1.77	$ 1.63	$ 11.68
Weighted average Common Shares outstanding	383,695	382,678	381,992

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Comprehensive income:
Net income	$ 685,192	$ 628,381	$ 4,480,104
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the year	5,174	6,439	(3,915)
Losses reclassified into earnings from other comprehensive income	18,452	18,858	41,758
Other comprehensive income (loss) – foreign currency:
Currency translation adjustments arising during the year	0	0	264
Other comprehensive income (loss)	23,626	25,297	38,107
Comprehensive income	708,818	653,678	4,518,211
Comprehensive (income) attributable to Noncontrolling Interests	(28,526)	(25,845)	(189,411)
Comprehensive income attributable to controlling interests	$ 680,292	$ 627,833	$ 4,328,800

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 685,192	$ 628,381	$ 4,480,104
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	785,725	743,749	705,649
Amortization of deferred financing costs	11,310	8,526	12,633
Amortization of above/below market lease intangibles	4,392	3,828	3,426
Amortization of discounts and premiums on debt	22,781	3,536	(17,986)
Amortization of deferred settlements on derivative instruments	18,440	18,847	41,680
Impairment	702	1,693	0
Write-off of pursuit costs	4,450	3,106	4,092
(Income) loss from investments in unconsolidated entities	3,667	3,370	(4,801)
Distributions from unconsolidated entities – return on capital	2,492	2,632	2,863
Net (gain) loss on sales of investment securities and other investments			(58,409)
Net (gain) loss on sales of real estate properties	(256,810)	(157,057)	(4,044,055)
Net (gain) loss on sales of land parcels	(987)	(19,167)	(15,731)
Net (gain) loss on sales of discontinued operations			(43)
Net (gain) loss on debt extinguishment	22,110	12,258	114,666
Realized/unrealized (gain) loss on derivative instruments	50		74
Compensation paid with Company Common Shares	27,132	24,997	30,530
Changes in assets and liabilities:
(Increase) decrease in other assets	4,097	(449)	31,147
Increase (decrease) in accounts payable and accrued expenses	(1,862)	11,532	(6,061)
Increase (decrease) in accrued interest payable	4,587	(2,911)	(24,275)
Increase (decrease) in other liabilities	16,578	(23,468)	(26,422)
Increase (decrease) in security deposits	2,249	2,385	(14,958)
Net cash provided by operating activities	1,356,295	1,265,788	1,214,123
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(708,092)	(466,394)	(205,880)
Investment in real estate – development/other	(154,431)	(276,382)	(566,825)
Capital expenditures to real estate	(188,501)	(202,607)	(172,177)
Non-real estate capital additions	(4,505)	(1,506)	(5,731)
Interest capitalized for real estate under development	(6,260)	(26,290)	(51,451)
Proceeds from disposition of real estate, net	691,526	384,583	6,824,659
Investments in unconsolidated entities	(6,571)	(6,034)	(5,266)
Distributions from unconsolidated entities – return of capital		334	13,798
Proceeds from sale of investment securities and other investments			72,815
Net cash provided by (used for) investing activities	(376,834)	(594,296)	5,903,942
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(8,583)	(6,289)	(13,305)
Mortgage notes payable, net:
Proceeds	96,935
Lump sum payoffs	(1,347,939)	(493,420)	(583,122)
Scheduled principal repayments	(6,629)	(10,704)	(8,544)
Notes, net:
Proceeds	896,294	692,466	496,705
Lump sum payoffs		(497,975)	(1,500,000)
Line of credit and commercial paper:
Line of credit proceeds	3,805,000	1,845,000	426,000
Line of credit repayments	(3,805,000)	(1,845,000)	(426,000)
Commercial paper proceeds	14,030,926	5,066,509	1,760,194
Commercial paper repayments	(13,831,500)	(4,786,750)	(2,127,472)
Proceeds from (payments on) settlement of derivative instruments	18,118	1,295	(4,662)
Proceeds from Employee Share Purchase Plan (ESPP)	3,879	3,744	3,686
Proceeds from exercise of options	30,655	31,596	35,833
Payment of offering costs	(27)	(51)	(314)
Other financing activities, net	(78)	(63)	(49)
Acquisition of Noncontrolling Interests – Partially Owned Properties	(13)
Contributions – Noncontrolling Interests – Partially Owned Properties	125	125
Contributions – Noncontrolling Interests – Operating Partnership	1		1
Distributions:
Common Shares	(782,122)	(739,375)	(4,771,725)
Preferred Shares	(3,863)	(3,091)	(2,318)
Noncontrolling Interests – Operating Partnership	(28,226)	(27,291)	(188,115)
Noncontrolling Interests – Partially Owned Properties	(9,753)	(8,286)	(36,219)
Net cash provided by (used for) financing activities	(963,910)	(789,818)	(7,054,092)
Net increase (decrease) in cash and cash equivalents and restricted deposits	15,551	(118,326)	63,973
Cash and cash equivalents and restricted deposits, beginning of year	100,762	219,088	155,115
Cash and cash equivalents and restricted deposits, end of year	116,313	100,762	219,088
Cash and cash equivalents	47,442	50,647	77,207
Restricted deposits	68,871	50,115	141,881
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	358,156	360,273	482,152
Net cash paid for income and other taxes	853	640	1,494
Real estate acquisitions/dispositions/other:
Mortgage loans assumed			43,400
Amortization of deferred financing costs:
Other assets	2,412	2,412	3,366
Mortgage notes payable, net	4,792	2,493	3,978
Notes, net	4,106	3,621	5,289
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	20,144	1,172	(21,158)
Notes, net	2,637	2,364	3,172
Amortization of deferred settlements on derivative instruments:
Other liabilities	(12)	(11)	(78)
Accumulated other comprehensive income	18,452	18,858	41,758
Write-off of pursuit costs:
Investment in real estate, net	4,364	2,965	3,586
Other assets	53	17	402
Accounts payable and accrued expenses	33	124	104
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	2,304	1,955	(6,327)
Other liabilities	1,363	1,415	1,526
Realized/unrealized (gain) loss on derivative instruments:
Other assets	(14,977)	(4,582)	1,798
Notes, net	(680)	(3,454)	(1,798)
Other liabilities	10,533	1,597	3,989
Accumulated other comprehensive income	5,174	6,439	(3,915)
Investments in unconsolidated entities:
Investments in unconsolidated entities	(4,891)	(3,034)	(2,326)
Other liabilities	(1,680)	(3,000)	(2,940)
Distributions from unconsolidated entities - return of capital:
Investments in unconsolidated entities		334	14,014
Other assets			(216)
Debt financing costs:
Other assets	(145)		(8,553)
Mortgage notes payable, net	(555)		(507)
Notes, net	(7,883)	(6,289)	(4,245)
Proceeds from (payments on) settlement of derivative instruments:
Other assets	18,118	1,295
Other liabilities			(4,662)
Other:
Foreign currency translation adjustments	0	0	(264)
Notes, Net [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Net gain (loss) on debt extinguishment			(82,934)
Mortgage Notes Payable, Net [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Net gain (loss) on debt extinguishment	$ (22,110)	$ (12,258)	$ (31,732)

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	COMMON SHARES, $0.01 PAR VALUE	PAID IN CAPITAL	RETAINED EARNINGS	Preferred Stock	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	OPERATING PARTNERSHIP	PARTIALLY OWNED PROPERTIES
Balance, beginning of year at Dec. 31, 2015		$ 3,648	$ 8,572,365	$ 2,009,091	$ 37,280	$ (152,016)
Balance, beginning of year at Dec. 31, 2015							$ 221,379	$ 4,608
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares		1	3,725
Exercise of share options		8	35,825
Employee Share Purchase Plan (ESPP)		1	3,685
Restricted shares		1	15,015
Share options			3,432
ESPP discount			650
PAID IN CAPITAL
Conversion of OP Units into Common Shares		1	3,725
Exercise of share options		8	35,825
Employee Share Purchase Plan (ESPP)		1	3,685
Share-based employee compensation expense:
Offering costs			(314)
Supplemental Executive Retirement Plan (SERP)			748
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership	$ (115,093)		115,093
Adjustment for Noncontrolling Interests ownership in Operating Partnership			8,198				(8,198)
RETAINED EARNINGS
Net income attributable to controlling interests	4,292,163			4,292,163
Common Share distributions				(4,754,537)
Preferred Share distributions				(3,091)
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) arising during the year	(3,915)					(3,915)
Losses reclassified into earnings from other comprehensive income	(41,758)					41,758
Currency translation adjustments arising during the year	264					264
Balance, beginning of year at Dec. 31, 2015							221,379	4,608
OPERATING PARTNERSHIP
Issuance of restricted units to Noncontrolling Interests							1
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner							(3,726)
Equity compensation associated with Noncontrolling Interests							18,180
Net income attributable to Noncontrolling Interests	171,511						171,511	16,430
Distributions to Noncontrolling Interests							(187,448)	(36,268)
Change in carrying value of Redeemable Noncontrolling Interests – Operating Partnership	(9,598)						9,598
Adjustment for Noncontrolling Interests ownership in Operating Partnership			8,198				(8,198)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	171,511						171,511	16,430
Distributions to Noncontrolling Interests							(187,448)	(36,268)
Other								25,839
Balance, end of period at Dec. 31, 2016		3,659	8,758,422	1,543,626	37,280	(113,909)
Balance, end of period at Dec. 31, 2016							221,297	10,609
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares		11	15,889
Exercise of share options		8	31,588
Employee Share Purchase Plan (ESPP)		1	3,743
Restricted shares		1	9,776
Share options			6,835
ESPP discount			747
PAID IN CAPITAL
Conversion of OP Units into Common Shares		11	15,889
Exercise of share options		8	31,588
Employee Share Purchase Plan (ESPP)		1	3,743
Share-based employee compensation expense:
Offering costs			(51)
Supplemental Executive Retirement Plan (SERP)			(594)
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership	(41,916)		41,916
Adjustment for Noncontrolling Interests ownership in Operating Partnership			18,315				(18,315)
RETAINED EARNINGS
Net income attributable to controlling interests	603,454			603,454
Common Share distributions				(740,459)
Preferred Share distributions				(3,091)
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) arising during the year	6,439					6,439
Losses reclassified into earnings from other comprehensive income	(18,858)					18,858
Currency translation adjustments arising during the year	0
Balance, beginning of year at Dec. 31, 2016							221,297	10,609
OPERATING PARTNERSHIP
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner							(15,900)
Equity compensation associated with Noncontrolling Interests							10,523
Net income attributable to Noncontrolling Interests	22,604						22,604	2,323
Distributions to Noncontrolling Interests							(26,739)	(8,349)
Change in carrying value of Redeemable Noncontrolling Interests – Operating Partnership	(33,221)						33,221
Adjustment for Noncontrolling Interests ownership in Operating Partnership			18,315				(18,315)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	22,604						22,604	2,323
Contributions by Noncontrolling Interests								125
Distributions to Noncontrolling Interests							(26,739)	(8,349)
Balance, end of period at Dec. 31, 2017	10,242,464	3,680	8,886,586	1,403,530	37,280	(88,612)
Balance, end of period at Dec. 31, 2017	231,399						226,691	4,708
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares		1	4,097
Exercise of share options		11	30,644
Employee Share Purchase Plan (ESPP)		1	3,878
Restricted shares		1	8,257
Share options			9,734
ESPP discount			767
PAID IN CAPITAL
Conversion of OP Units into Common Shares		1	4,097
Exercise of share options		11	30,644
Employee Share Purchase Plan (ESPP)		1	3,878
Share-based employee compensation expense:
Offering costs			(27)
Supplemental Executive Retirement Plan (SERP)			(454)
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership	13,922		(13,922)
Adjustment for Noncontrolling Interests ownership in Operating Partnership			5,893				(5,893)
RETAINED EARNINGS
Net income attributable to controlling interests	657,535			657,535
Common Share distributions				(796,212)
Preferred Share distributions				(3,090)
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) arising during the year	5,174					5,174
Losses reclassified into earnings from other comprehensive income	(18,452)					18,452
Currency translation adjustments arising during the year	0
Balance, beginning of year at Dec. 31, 2017	231,399						226,691	4,708
OPERATING PARTNERSHIP
Issuance of restricted units to Noncontrolling Interests							1
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner							(4,098)
Equity compensation associated with Noncontrolling Interests							14,009
Net income attributable to Noncontrolling Interests	24,939						24,939	2,718
Distributions to Noncontrolling Interests							(28,682)	(9,831)
Change in carrying value of Redeemable Noncontrolling Interests – Operating Partnership	(1,771)						1,771
Adjustment for Noncontrolling Interests ownership in Operating Partnership			5,893				(5,893)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	24,939						24,939	2,718
Acquisition Noncontrolling Interests Partially Owned Properties								(13)
Contributions by Noncontrolling Interests								125
Distributions to Noncontrolling Interests							(28,682)	(9,831)
Balance, end of period at Dec. 31, 2018	10,173,204	$ 3,694	$ 8,935,453	$ 1,261,763	$ 37,280	$ (64,986)
Balance, end of period at Dec. 31, 2018	$ 226,445						$ 228,738	$ (2,293)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Stockholders Equity [Abstract]
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01	$ 0.01

CONSOLIDATED BALANCE SHEETS OF

CONSOLIDATED BALANCE SHEETS OF ERP OPERATING LIMITED PARTNERSHIP - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Land	$ 5,875,803	$ 5,996,024
Depreciable property	20,435,901	19,768,362
Projects under development	109,409	163,547
Land held for development	89,909	98,963
Investment in real estate	26,511,022	26,026,896
Accumulated depreciation	(6,696,281)	(6,040,378)
Investment in real estate, net	19,814,741	19,986,518
Investments in unconsolidated entities	58,349	58,254
Cash and cash equivalents	47,442	50,647
Restricted deposits	68,871	50,115
Other assets	404,806	425,065
Total assets	20,394,209	20,570,599
Liabilities:
Mortgage notes payable, net	2,385,470	3,618,722
Notes, net	5,933,286	5,038,812
Line of credit and commercial paper	499,183	299,757
Accounts payable and accrued expenses	102,471	114,766
Accrued interest payable	62,622	58,035
Other liabilities	358,563	341,852
Security deposits	67,258	65,009
Distributions payable	206,601	192,828
Total liabilities	9,615,454	9,729,781
Commitments and contingencies
Partners’ Capital:
Accumulated other comprehensive income (loss)	(64,986)	(88,612)
Noncontrolling Interests – Partially Owned Properties	(2,293)	4,708
Total liabilities and equity/capital	20,394,209	20,570,599
ERPOP [Member]
ASSETS
Land	5,875,803	5,996,024
Depreciable property	20,435,901	19,768,362
Projects under development	109,409	163,547
Land held for development	89,909	98,963
Investment in real estate	26,511,022	26,026,896
Accumulated depreciation	(6,696,281)	(6,040,378)
Investment in real estate, net	19,814,741	19,986,518
Investments in unconsolidated entities	58,349	58,254
Cash and cash equivalents	47,442	50,647
Restricted deposits	68,871	50,115
Other assets	404,806	425,065
Total assets	20,394,209	20,570,599
Liabilities:
Mortgage notes payable, net	2,385,470	3,618,722
Notes, net	5,933,286	5,038,812
Line of credit and commercial paper	499,183	299,757
Accounts payable and accrued expenses	102,471	114,766
Accrued interest payable	62,622	58,035
Other liabilities	358,563	341,852
Security deposits	67,258	65,009
Distributions payable	206,601	192,828
Total liabilities	9,615,454	9,729,781
Commitments and contingencies
Redeemable Limited Partners	379,106	366,955
Partners’ Capital:
Preference Units	37,280	37,280
General Partner	10,200,910	10,293,796
Limited Partners	228,738	226,691
Accumulated other comprehensive income (loss)	(64,986)	(88,612)
Total partners’ capital	10,401,942	10,469,155
Noncontrolling Interests – Partially Owned Properties	(2,293)	4,708
Total capital	10,399,649	10,473,863
Total liabilities and equity/capital	$ 20,394,209	$ 20,570,599

CONSOLIDATED STATEMENTS OF OP_2

CONSOLIDATED STATEMENTS OF OPERATIONS OF ERP OPERATING LIMITED PARTNERSHIP - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
REVENUES
Rental income	$ 2,577,681	$ 2,470,689	$ 2,422,233
Fee and asset management	$ 753	$ 717	$ 3,567
Type of Revenue [Extensible List]	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember
Total revenues	$ 2,578,434	$ 2,471,406	$ 2,425,800
EXPENSES
Property and maintenance	429,335	405,281	406,823
Real estate taxes and insurance	357,814	335,495	317,387
Property management	92,485	85,493	82,015
General and administrative	53,813	52,224	57,840
Depreciation	785,725	743,749	705,649
Impairment	702	1,693	0
Total expenses	1,719,874	1,623,935	1,569,714
Operating income	858,560	847,471	856,086
Interest and other income	15,317	6,136	65,773
Other expenses	(17,267)	(5,186)	(10,368)
Interest:
Expense incurred, net	(413,360)	(383,890)	(482,246)
Amortization of deferred financing costs	(11,310)	(8,526)	(12,633)
Income before income and other taxes, income (loss) from investments in unconsolidated entities, net gain (loss) on sales of real estate properties and land parcels and discontinued operations	431,940	456,005	416,612
Income and other tax (expense) benefit	(878)	(478)	(1,613)
Income (loss) from investments in unconsolidated entities	(3,667)	(3,370)	4,801
Net gain (loss) on sales of real estate properties	256,810	157,057	4,044,055
Net gain (loss) on sales of land parcels	987	19,167	15,731
Income from continuing operations	685,192	628,381	4,479,586
Discontinued operations, net	0	0	518
Net income	685,192	628,381	4,480,104
Partially Owned Properties	(2,718)	(2,323)	(16,430)
Net income attributable to controlling interests	$ 657,535	$ 603,454	$ 4,292,163
Earnings per Unit – basic:
Income from continuing operations available to Units	$ 1.78	$ 1.64	$ 11.75
Net income available to Units	1.78	1.64	11.75
Earnings per Unit – diluted:
Income from continuing operations available to Units	1.77	1.63	11.68
Net income available to Units	$ 1.77	$ 1.63	$ 11.68
Weighted average Units outstanding	383,695	382,678	381,992
ERPOP [Member]
REVENUES
Rental income	$ 2,577,681	$ 2,470,689	$ 2,422,233
Fee and asset management	$ 753	$ 717	$ 3,567
Type of Revenue [Extensible List]	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember
Total revenues	$ 2,578,434	$ 2,471,406	$ 2,425,800
EXPENSES
Property and maintenance	429,335	405,281	406,823
Real estate taxes and insurance	357,814	335,495	317,387
Property management	92,485	85,493	82,015
General and administrative	53,813	52,224	57,840
Depreciation	785,725	743,749	705,649
Impairment	702	1,693
Total expenses	1,719,874	1,623,935	1,569,714
Operating income	858,560	847,471	856,086
Interest and other income	15,317	6,136	65,773
Other expenses	(17,267)	(5,186)	(10,368)
Interest:
Expense incurred, net	(413,360)	(383,890)	(482,246)
Amortization of deferred financing costs	(11,310)	(8,526)	(12,633)
Income before income and other taxes, income (loss) from investments in unconsolidated entities, net gain (loss) on sales of real estate properties and land parcels and discontinued operations	431,940	456,005	416,612
Income and other tax (expense) benefit	(878)	(478)	(1,613)
Income (loss) from investments in unconsolidated entities	(3,667)	(3,370)	4,801
Net gain (loss) on sales of real estate properties	256,810	157,057	4,044,055
Net gain (loss) on sales of land parcels	987	19,167	15,731
Income from continuing operations	685,192	628,381	4,479,586
Discontinued operations, net			518
Net income	685,192	628,381	4,480,104
Partially Owned Properties	(2,718)	(2,323)	(16,430)
Net income attributable to controlling interests	682,474	626,058	4,463,674
ALLOCATION OF NET INCOME:
Preference Units	3,090	3,091	3,091
General Partner	654,445	600,363	4,289,072
Limited Partners	24,939	22,604	171,511
Net income available to Units	$ 679,384	$ 622,967	$ 4,460,583
Earnings per Unit – basic:
Income from continuing operations available to Units	$ 1.78	$ 1.64	$ 11.75
Net income available to Units	$ 1.78	$ 1.64	$ 11.75
Weighted average Units outstanding	380,921	379,869	378,829
Earnings per Unit – diluted:
Income from continuing operations available to Units	$ 1.77	$ 1.63	$ 11.68
Net income available to Units	$ 1.77	$ 1.63	$ 11.68
Weighted average Units outstanding	383,695	382,678	381,992

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Comprehensive income:
Net income	$ 685,192	$ 628,381	$ 4,480,104
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the year	5,174	6,439	(3,915)
Losses reclassified into earnings from other comprehensive income	18,452	18,858	41,758
Other comprehensive income (loss) – foreign currency:
Currency translation adjustments arising during the year	0	0	264
Other comprehensive income (loss)	23,626	25,297	38,107
Comprehensive income	708,818	653,678	4,518,211
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(28,526)	(25,845)	(189,411)
Comprehensive income attributable to controlling interests	680,292	627,833	4,328,800
ERPOP [Member]
Comprehensive income:
Net income	685,192	628,381	4,480,104
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the year	5,174	6,439	(3,915)
Losses reclassified into earnings from other comprehensive income	18,452	18,858	41,758
Other comprehensive income (loss) – foreign currency:
Currency translation adjustments arising during the year			264
Other comprehensive income (loss)	23,626	25,297	38,107
Comprehensive income	708,818	653,678	4,518,211
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(2,718)	(2,323)	(16,430)
Comprehensive income attributable to controlling interests	$ 706,100	$ 651,355	$ 4,501,781

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS OF ERP OPERATING LIMITED PARTNERSHIP $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 685,192	$ 628,381	$ 4,480,104
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	785,725	743,749	705,649
Amortization of deferred financing costs	11,310	8,526	12,633
Amortization of above/below market lease intangibles	4,392	3,828	3,426
Amortization of discounts and premiums on debt	22,781	3,536	(17,986)
Amortization of deferred settlements on derivative instruments	18,440	18,847	41,680
Impairment	702	1,693	0
Write-off of pursuit costs	4,450	3,106	4,092
(Income) loss from investments in unconsolidated entities	3,667	3,370	(4,801)
Distributions from unconsolidated entities – return on capital	2,492	2,632	2,863
Net (gain) loss on sales of investment securities and other investments			(58,409)
Net (gain) loss on sales of real estate properties	(256,810)	(157,057)	(4,044,055)
Net (gain) loss on sales of land parcels	(987)	(19,167)	(15,731)
Net (gain) loss on sales of discontinued operations			(43)
Net (gain) loss on debt extinguishment	22,110	12,258	114,666
Realized/unrealized (gain) loss on derivative instruments	50		74
Compensation paid with Company Common Shares	27,132	24,997	30,530
Changes in assets and liabilities:
(Increase) decrease in other assets	4,097	(449)	31,147
Increase (decrease) in accounts payable and accrued expenses	(1,862)	11,532	(6,061)
Increase (decrease) in accrued interest payable	4,587	(2,911)	(24,275)
Increase (decrease) in other liabilities	16,578	(23,468)	(26,422)
Increase (decrease) in security deposits	2,249	2,385	(14,958)
Net cash provided by operating activities	1,356,295	1,265,788	1,214,123
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(708,092)	(466,394)	(205,880)
Investment in real estate – development/other	(154,431)	(276,382)	(566,825)
Capital expenditures to real estate	(188,501)	(202,607)	(172,177)
Non-real estate capital additions	(4,505)	(1,506)	(5,731)
Interest capitalized for real estate under development	(6,260)	(26,290)	(51,451)
Proceeds from disposition of real estate, net	691,526	384,583	6,824,659
Investments in unconsolidated entities	(6,571)	(6,034)	(5,266)
Distributions from unconsolidated entities – return of capital		334	13,798
Proceeds from sale of investment securities and other investments			72,815
Net cash provided by (used for) investing activities	(376,834)	(594,296)	5,903,942
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(8,583)	(6,289)	(13,305)
Mortgage notes payable, net:
Proceeds	96,935
Lump sum payoffs	(1,347,939)	(493,420)	(583,122)
Scheduled principal repayments	(6,629)	(10,704)	(8,544)
Notes, net:
Proceeds	896,294	692,466	496,705
Lump sum payoffs		(497,975)	(1,500,000)
Line of credit and commercial paper:
Line of credit proceeds	3,805,000	1,845,000	426,000
Line of credit repayments	(3,805,000)	(1,845,000)	(426,000)
Commercial paper proceeds	14,030,926	5,066,509	1,760,194
Commercial paper repayments	(13,831,500)	(4,786,750)	(2,127,472)
Proceeds from (payments on) settlement of derivative instruments	18,118	1,295	(4,662)
Proceeds from Employee Share Purchase Plan (ESPP)	3,879	3,744	3,686
Proceeds from exercise of EQR options	30,655	31,596	35,833
Payment of offering costs	(27)	(51)	(314)
Other financing activities, net	(78)	(63)	(49)
Contributions – Noncontrolling Interests – Partially Owned Properties	125	125
Contributions – Limited Partners	1		1
Distributions:
OP Units – General Partner	(782,122)	(739,375)	(4,771,725)
Preference Units	(3,863)	(3,091)	(2,318)
OP Units – Limited Partners	(28,226)	(27,291)	(188,115)
Noncontrolling Interests – Partially Owned Properties	(9,753)	(8,286)	(36,219)
Net cash provided by (used for) financing activities	(963,910)	(789,818)	(7,054,092)
Net increase (decrease) in cash and cash equivalents and restricted deposits	15,551	(118,326)	63,973
Cash and cash equivalents and restricted deposits, beginning of year	100,762	219,088	155,115
Cash and cash equivalents and restricted deposits, end of year	116,313	100,762	219,088
Cash and cash equivalents	47,442	50,647	77,207
Restricted deposits	68,871	50,115	141,881
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	358,156	360,273	482,152
Net cash paid for income and other taxes	853	640	1,494
Real estate acquisitions/dispositions/other:
Mortgage loans assumed			43,400
Amortization of deferred financing costs:
Other assets	2,412	2,412	3,366
Mortgage notes payable, net	4,792	2,493	3,978
Notes, net	4,106	3,621	5,289
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	20,144	1,172	(21,158)
Notes, net	2,637	2,364	3,172
Amortization of deferred settlements on derivative instruments:
Other liabilities	(12)	(11)	(78)
Accumulated other comprehensive income	18,452	18,858	41,758
Write-off of pursuit costs:
Investment in real estate, net	4,364	2,965	3,586
Other assets	53	17	402
Accounts payable and accrued expenses	33	124	104
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	2,304	1,955	(6,327)
Other liabilities	1,363	1,415	1,526
Realized/unrealized (gain) loss on derivative instruments:
Other assets	(14,977)	(4,582)	1,798
Notes, net	(680)	(3,454)	(1,798)
Other liabilities	10,533	1,597	3,989
Accumulated other comprehensive income	5,174	6,439	(3,915)
Investments in unconsolidated entities:
Investments in unconsolidated entities	(4,891)	(3,034)	(2,326)
Other liabilities	(1,680)	(3,000)	(2,940)
Distributions from unconsolidated entities - return of capital:
Other assets			(216)
Debt financing costs:
Other assets	(145)		(8,553)
Mortgage notes payable, net	(555)		(507)
Notes, net	(7,883)	(6,289)	(4,245)
Proceeds from (payments on) settlement of derivative instruments:
Other assets	18,118	1,295
Other liabilities			(4,662)
Other:
Foreign currency translation adjustments	0	0	(264)
Notes, Net [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Net gain (loss) on debt extinguishment			(82,934)
Mortgage Notes Payable, Net [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Net gain (loss) on debt extinguishment	(22,110)	(12,258)	(31,732)
ERPOP [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	685,192	628,381	4,480,104
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	785,725	743,749	705,649
Amortization of deferred financing costs	11,310	8,526	12,633
Amortization of above/below market lease intangibles	4,392	3,828	3,426
Amortization of discounts and premiums on debt	22,781	3,536	(17,986)
Amortization of deferred settlements on derivative instruments	18,440	18,847	41,680
Impairment	702	1,693
Write-off of pursuit costs	4,450	3,106	4,092
(Income) loss from investments in unconsolidated entities	3,667	3,370	(4,801)
Distributions from unconsolidated entities – return on capital	2,492	2,632	2,863
Net (gain) loss on sales of investment securities and other investments			(58,409)
Net (gain) loss on sales of real estate properties	(256,810)	(157,057)	(4,044,055)
Net (gain) loss on sales of land parcels	(987)	(19,167)	(15,731)
Net (gain) loss on sales of discontinued operations			(43)
Net (gain) loss on debt extinguishment	22,110	12,258	114,666
Realized/unrealized (gain) loss on derivative instruments	50		74
Compensation paid with Company Common Shares	27,132	24,997	30,530
Changes in assets and liabilities:
(Increase) decrease in other assets	4,097	(449)	31,147
Increase (decrease) in accounts payable and accrued expenses	(1,862)	11,532	(6,061)
Increase (decrease) in accrued interest payable	4,587	(2,911)	(24,275)
Increase (decrease) in other liabilities	16,578	(23,468)	(26,422)
Increase (decrease) in security deposits	2,249	2,385	(14,958)
Net cash provided by operating activities	1,356,295	1,265,788	1,214,123
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(708,092)	(466,394)	(205,880)
Investment in real estate – development/other	(154,431)	(276,382)	(566,825)
Capital expenditures to real estate	(188,501)	(202,607)	(172,177)
Non-real estate capital additions	(4,505)	(1,506)	(5,731)
Interest capitalized for real estate under development	(6,260)	(26,290)	(51,451)
Proceeds from disposition of real estate, net	691,526	384,583	6,824,659
Investments in unconsolidated entities	(6,571)	(6,034)	(5,266)
Distributions from unconsolidated entities – return of capital		334	13,798
Proceeds from sale of investment securities and other investments			72,815
Net cash provided by (used for) investing activities	(376,834)	(594,296)	5,903,942
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(8,583)	(6,289)	(13,305)
Mortgage notes payable, net:
Proceeds	96,935
Lump sum payoffs	(1,347,939)	(493,420)	(583,122)
Scheduled principal repayments	(6,629)	(10,704)	(8,544)
Notes, net:
Proceeds	896,294	692,466	496,705
Lump sum payoffs		(497,975)	(1,500,000)
Line of credit and commercial paper:
Line of credit proceeds	3,805,000	1,845,000	426,000
Line of credit repayments	(3,805,000)	(1,845,000)	(426,000)
Commercial paper proceeds	14,030,926	5,066,509	1,760,194
Commercial paper repayments	(13,831,500)	(4,786,750)	(2,127,472)
Proceeds from (payments on) settlement of derivative instruments	18,118	1,295	(4,662)
Proceeds from Employee Share Purchase Plan (ESPP)	3,879	3,744	3,686
Proceeds from exercise of EQR options	30,655	31,596	35,833
Payment of offering costs	(27)	(51)	(314)
Other financing activities, net	(78)	(63)	(49)
Acquisition of Noncontrolling Interests – Partially Owned Properties	(13)
Contributions – Noncontrolling Interests – Partially Owned Properties	125	125
Contributions – Limited Partners	1		1
Distributions:
OP Units – General Partner	(782,122)	(739,375)	(4,771,725)
Preference Units	(3,863)	(3,091)	(2,318)
OP Units – Limited Partners	(28,226)	(27,291)	(188,115)
Noncontrolling Interests – Partially Owned Properties	(9,753)	(8,286)	(36,219)
Net cash provided by (used for) financing activities	(963,910)	(789,818)	(7,054,092)
Net increase (decrease) in cash and cash equivalents and restricted deposits	15,551	(118,326)	63,973
Cash and cash equivalents and restricted deposits, beginning of year	100,762	219,088	155,115
Cash and cash equivalents and restricted deposits, end of year	116,313	100,762	219,088
Cash and cash equivalents	47,442	50,647	77,207
Restricted deposits	68,871	50,115	141,881
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	358,156	360,273	482,152
Net cash paid for income and other taxes	853	640	1,494
Real estate acquisitions/dispositions/other:
Mortgage loans assumed			43,400
Amortization of deferred financing costs:
Other assets	2,412	2,412	3,366
Mortgage notes payable, net	4,792	2,493	3,978
Notes, net	4,106	3,621	5,289
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	20,144	1,172	(21,158)
Notes, net	2,637	2,364	3,172
Amortization of deferred settlements on derivative instruments:
Other liabilities	(12)	(11)	(78)
Accumulated other comprehensive income	18,452	18,858	41,758
Write-off of pursuit costs:
Investment in real estate, net	4,364	2,965	3,586
Other assets	53	17	402
Accounts payable and accrued expenses	33	124	104
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	2,304	1,955	(6,327)
Other liabilities	1,363	1,415	1,526
Realized/unrealized (gain) loss on derivative instruments:
Other assets	(14,977)	(4,582)	1,798
Notes, net	(680)	(3,454)	(1,798)
Other liabilities	10,533	1,597	3,989
Accumulated other comprehensive income	5,174	6,439	(3,915)
Investments in unconsolidated entities:
Investments in unconsolidated entities	(4,891)	(3,034)	(2,326)
Other liabilities	(1,680)	(3,000)	(2,940)
Distributions from unconsolidated entities - return of capital:
Investments in unconsolidated entities		334	14,014
Other assets			(216)
Debt financing costs:
Other assets	(145)		(8,553)
Mortgage notes payable, net	(555)		(507)
Notes, net	(7,883)	(6,289)	(4,245)
Proceeds from (payments on) settlement of derivative instruments:
Other assets	18,118	1,295
Other liabilities			(4,662)
Other:
Foreign currency translation adjustments			(264)
ERPOP [Member] | Notes, Net [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Net gain (loss) on debt extinguishment			(82,934)
ERPOP [Member] | Mortgage Notes Payable, Net [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Net gain (loss) on debt extinguishment	$ (22,110)	$ (12,258)	$ (31,732)

CONSOLIDATED STATEMENTS OF CH_3

CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP - USD ($) $ in Thousands	Total	ERPOP [Member]	PREFERRED SHARESERPOP [Member]	General Partner [Member]	General Partner [Member]ERPOP [Member]	Limited Partner [Member]ERPOP [Member]	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)ERPOP [Member]	PARTIALLY OWNED PROPERTIES [Member]ERPOP [Member]
Balance, beginning of year at Dec. 31, 2015			$ 37,280		$ 10,585,104	$ 221,379	$ (152,016)
Balance, beginning of year at Dec. 31, 2015								$ 4,608
OP Unit Issuance:
Conversion of OP Units held by Limited Partners into OP Units held by General Partner					3,726	(3,726)
Exercise of EQR share options					35,833
EQR's Employee Share Purchase Plan (ESPP)				$ 3,686
Share-based employee compensation expense:
EQR restricted shares					15,016
EQR share options					3,432
EQR ESPP discount					650
Net income available to Units – General Partner		$ 4,289,072			4,289,072
OP Units – General Partner distributions					(4,754,537)
Offering costs					(314)
Supplemental Executive Retirement Plan (SERP)					748
Change in market value of Redeemable Limited Partners					115,093
Adjustment for Limited Partners ownership in Operating Partnership					8,198	(8,198)
LIMITED PARTNERS
Issuance of restricted units to Limited Partners						1
Conversion of OP Units held by Limited Partners into OP Units held by General Partner					3,726	(3,726)
Equity compensation associated with Units – Limited Partners						18,180
Limited Partners		171,511				171,511
Units – Limited Partners distributions						(187,448)
Change in carrying value of Redeemable Limited Partners						9,598
Adjustment for Limited Partners ownership in Operating Partnership					8,198	(8,198)
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) arising during the year	$ (3,915)	(3,915)					(3,915)
Losses reclassified into earnings from other comprehensive income	(41,758)	(41,758)					41,758
Currency translation adjustments arising during the year	264	264					264
PARTIALLY OWNED PROPERTIES
Net income	4,480,104	4,480,104						16,430
Distributions to Noncontrolling Interests								(36,268)
Other								25,839
Balance, end of year at Dec. 31, 2016			37,280		10,305,707	221,297	(113,909)
Balance, end of year at Dec. 31, 2016								10,609
OP Unit Issuance:
Conversion of OP Units held by Limited Partners into OP Units held by General Partner					15,900	(15,900)
Exercise of EQR share options					31,596
EQR's Employee Share Purchase Plan (ESPP)				3,744
Share-based employee compensation expense:
EQR restricted shares					9,777
EQR share options					6,835
EQR ESPP discount					747
Net income available to Units – General Partner		600,363			600,363
OP Units – General Partner distributions					(740,459)
Offering costs					(51)
Supplemental Executive Retirement Plan (SERP)					(594)
Change in market value of Redeemable Limited Partners					41,916
Adjustment for Limited Partners ownership in Operating Partnership					18,315	(18,315)
LIMITED PARTNERS
Conversion of OP Units held by Limited Partners into OP Units held by General Partner					15,900	(15,900)
Equity compensation associated with Units – Limited Partners						10,523
Limited Partners		22,604				22,604
Units – Limited Partners distributions						(26,739)
Change in carrying value of Redeemable Limited Partners						33,221
Adjustment for Limited Partners ownership in Operating Partnership					18,315	(18,315)
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) arising during the year	6,439	6,439					6,439
Losses reclassified into earnings from other comprehensive income	(18,858)	(18,858)					18,858
Currency translation adjustments arising during the year	0
PARTIALLY OWNED PROPERTIES
Net income	628,381	628,381						2,323
Contributions by Noncontrolling Interests								125
Distributions to Noncontrolling Interests								(8,349)
Balance, end of year at Dec. 31, 2017			37,280		10,293,796	226,691	(88,612)
Balance, end of year at Dec. 31, 2017								4,708
OP Unit Issuance:
Conversion of OP Units held by Limited Partners into OP Units held by General Partner					4,098	(4,098)
Exercise of EQR share options					30,655
EQR's Employee Share Purchase Plan (ESPP)				$ 3,879
Share-based employee compensation expense:
EQR restricted shares					8,258
EQR share options					9,734
EQR ESPP discount					767
Net income available to Units – General Partner		654,445			654,445
OP Units – General Partner distributions					(796,212)
Offering costs					(27)
Supplemental Executive Retirement Plan (SERP)					(454)
Change in market value of Redeemable Limited Partners					(13,922)
Adjustment for Limited Partners ownership in Operating Partnership					5,893	(5,893)
LIMITED PARTNERS
Issuance of restricted units to Limited Partners						1
Conversion of OP Units held by Limited Partners into OP Units held by General Partner					4,098	(4,098)
Equity compensation associated with Units – Limited Partners						14,009
Limited Partners		24,939				24,939
Units – Limited Partners distributions						(28,682)
Change in carrying value of Redeemable Limited Partners						1,771
Adjustment for Limited Partners ownership in Operating Partnership					5,893	(5,893)
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) arising during the year	5,174	5,174					5,174
Losses reclassified into earnings from other comprehensive income	(18,452)	(18,452)					18,452
Currency translation adjustments arising during the year	0
PARTIALLY OWNED PROPERTIES
Net income	$ 685,192	$ 685,192						2,718
Contributions by Noncontrolling Interests								125
Distributions to Noncontrolling Interests								(9,831)
Acquisitions of Noncontrolling Interests - Partially Owned Properties								13
Acquisition Noncontrolling Interests Partially Owned Properties								(13)
Balance, end of year at Dec. 31, 2018			$ 37,280		$ 10,200,910	$ 228,738	$ (64,986)
Balance, end of year at Dec. 31, 2018								$ (2,293)

Business

Business	12 Months Ended
	Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Business	1. Equity Residential (“EQR”) is an S&P 500 company focused on the acquisition, development and management of rental apartment properties located in urban and high-density suburban markets, a business that is conducted on its behalf by ERP Operating Limited Partnership (“ERPOP”). EQR is a Maryland real estate investment trust (“REIT”) formed in March 1993 and ERPOP is an Illinois limited partnership formed in May 1993. References to the “Company,” “we,” “us” or “our” mean collectively EQR, ERPOP and those entities/subsidiaries owned or controlled by EQR and/or ERPOP. References to the “Operating Partnership” mean collectively ERPOP and those entities/subsidiaries owned or controlled by ERPOP. Unless otherwise indicated, the notes to consolidated financial statements apply to both the Company and the Operating Partnership. EQR is the general partner of, and as of December 31, 2018 owned an approximate 96.4% ownership interest in, ERPOP. All of the Company’s property ownership, development and related business operations are conducted through the Operating Partnership and EQR has no material assets or liabilities other than its investment in ERPOP. EQR issues public equity from time to time, the net proceeds of which it is obligated to contribute to ERPOP, but does not have any indebtedness as all debt is incurred by the Operating Partnership. The Operating Partnership holds substantially all of the assets of the Company, including the Company’s ownership interests in its joint ventures. The Operating Partnership conducts the operations of the business and is structured as a partnership with no publicly traded equity. As of December 31, 2018, the Company, directly or indirectly through investments in title holding entities, owned all or a portion of 307 properties located in 11 states and the District of Columbia consisting of 79,482 apartment units. The ownership breakdown includes (table does not include various uncompleted development properties): Properties Apartment Units Wholly Owned Properties 287 74,840 Master-Leased Property – Consolidated 1 162 Partially Owned Properties – Consolidated 17 3,535 Partially Owned Properties – Unconsolidated 2 945 307 79,482 Note: Effective February 1, 2018 and April 2, 2018, the Company took over management of two of its Master-Leased properties containing 94 apartment units and 597 apartment units located in Boston and Los Angeles, respectively. The “Wholly Owned Properties” are accounted for under the consolidation method of accounting. The “Master-Leased Property – Consolidated” is wholly owned by the Company but the entire project is leased to a third party corporate housing provider. This property is consolidated and reflected as a real estate asset while the master lease is accounted for as an operating lease. The “Partially Owned Properties – Consolidated” are controlled by the Company, but have partners with noncontrolling interests and are accounted for under the consolidation method of accounting and qualify as variable interest entities. The “Partially Owned Properties – Unconsolidated” are controlled by the Company’s partners but the Company has noncontrolling interests and are accounted for under the equity method of accounting. The Company maintains long-term ground leases for 14 operating properties. The Company owns the building and improvements and leases the land underlying the improvements under long-term ground leases. The expiration dates for these leases range from 2042 through 2113. These properties are consolidated and reflected as real estate assets while the ground leases are accounted for as operating leases. See Note 2 for additional discussion regarding the new leases standard.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Summary Of Significant Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Basis of Presentation Due to the Company’s ability as general partner to control either through ownership or by contract the Operating Partnership and its subsidiaries, the Operating Partnership and each such subsidiary has been consolidated with the Company for financial reporting purposes, except for our unconsolidated properties/entities. Real Estate Assets and Depreciation of Investment in Real Estate Effective January 1, 2017 with the adoption of the new standard which clarified the definition of a business (discussed below in Recently Adopted Accounting Pronouncements For asset acquisitions, the Company allocates the purchase price of the net tangible and identified intangible assets on a relative fair value basis. In making estimates of relative fair values for purposes of allocating purchase price, the Company utilizes a number of sources, including independent appraisals that may be obtained in connection with the acquisition or financing of the respective property, our own analysis of recently acquired and existing comparable properties in our portfolio and other market data. The Company also considers information obtained about each property as a result of its pre-acquisition due diligence, marketing and leasing activities in estimating the relative fair value of the tangible and intangible assets/liabilities acquired. The Company allocates the purchase price of acquired real estate to various components as follows: • Land – Based on actual purchase price adjusted to an allocation of the relative fair value (as necessary) if acquired separately or market research/comparables if acquired with an operating property. • Furniture, Fixtures and Equipment – Ranges between $10,000 and $35,000 per apartment unit acquired as an estimate of the allocation of the relative fair value of the appliances and fixtures inside an apartment unit. The per-apartment unit amount applied depends on the economic age of the apartment building acquired. Depreciation is calculated on the straight-line method over an estimated useful life of five to ten years. • Lease Intangibles – The Company considers the value of acquired in-place leases and above/below market leases and the amortization period is the average remaining term of each respective acquired lease. In-place residential leases’ average term at acquisition approximates six months. In-place retail leases’ term at acquisition approximates the average remaining term of all acquired retail leases. See Note 4 for more information on above and below market leases. • Other Intangible Assets – The Company considers whether it has acquired other intangible assets, including any customer relationship intangibles and the amortization period is the estimated useful life of the acquired intangible asset. • Building – Based on the allocation of the relative fair value determined on an “as-if vacant” basis. Depreciation is calculated on the straight-line method over an estimated useful life of thirty years. • Site Improvements – Based on replacement cost, which approximates the allocation of the relative fair value. Depreciation is calculated on the straight-line method over an estimated useful life of eight years. • Long-Term Debt – The Company calculates the allocation of the relative fair value by discounting the remaining contractual cash flows on each instrument at the current market rate for those borrowings. Replacements inside an apartment unit such as appliances and carpeting are depreciated over an estimated useful life of five to ten years. Renovation expenditures for ordinary maintenance and repairs are expensed to operations as incurred and significant renovations and improvements that improve and/or extend the useful life of the asset are capitalized over their estimated useful life, generally five to fifteen years. Initial direct leasing costs are expensed as incurred as such expense approximates the deferral and amortization of initial direct leasing costs over the lease terms. Property sales or dispositions are recorded when control transfers to unrelated third parties, contingencies have been removed and sufficient cash consideration has been received by the Company. Upon disposition, the related costs and accumulated depreciation are removed from the respective accounts. Any gain or loss on sale is recognized in accordance with accounting principles generally accepted in the United States. The Company classifies real estate assets as real estate held for sale when it is probable a property will be disposed of (see below for further discussion). The Company classifies properties under development and/or expansion and properties in the lease-up phase (including land) as construction-in-progress until construction has been completed and certificates of occupancy permits have been obtained. Impairment of Long-Lived Assets The Company periodically evaluates its long-lived assets, including its investments in real estate, for indicators of impairment. The judgments regarding the existence of impairment indicators are based on factors such as operational performance, market conditions and legal and environmental concerns, as well as the Company’s ability to hold and its intent with regard to each asset. Future events could occur which would cause the Company to conclude that impairment indicators exist and an impairment loss is warranted. If impairment indicators exist, the Company performs the following: • For long-lived operating assets to be held and used, the Company compares the expected future undiscounted cash flows for the long-lived asset against the carrying amount of that asset. If the sum of the estimated undiscounted cash flows is less than the carrying amount of the asset, the Company would record an impairment loss for the difference between the estimated fair value and the carrying amount of the asset. • For long-lived non-operating assets (projects under development and land held for development), management evaluates major cost overruns, market conditions that could affect lease-up projections, intent and ability to hold the asset and any other indicators of impairment. If any of the indicators were to suggest impairment was present, the carrying value of the asset would be adjusted accordingly to fair value. • For long-lived assets to be disposed of, an impairment loss is recognized when the estimated fair value of the asset, less the estimated cost to sell, is less than the carrying amount of the asset measured at the time that the Company has determined it will sell the asset. Long-lived assets held for sale and the related liabilities are separately reported, with the long-lived assets reported at the lower of their carrying amounts or their estimated fair values, less their costs to sell, and are not depreciated after reclassification to real estate held for sale. Cost Capitalization See the Real Estate Assets and Depreciation of Investment in Real Estate For all development projects, the Company uses its professional judgment in determining whether such costs meet the criteria for capitalization or must be expensed as incurred. The Company capitalizes interest, real estate taxes and insurance and payroll and associated costs for those individuals directly responsible for and who spend their time on development activities, with capitalization ceasing no later than 90 days following issuance of the certificate of occupancy. These costs are reflected on the balance sheets as construction-in-progress for each specific property. The Company expenses as incurred all payroll costs of on-site employees working directly at our properties, except as noted above on our development properties prior to certificate of occupancy issuance and on specific major renovations at selected properties when additional incremental employees are hired. During the years ended December 31, 2018, 2017 and 2016, the Company capitalized $13.2 million, $14.7 million and $18.7 million, respectively, of payroll and associated costs of employees directly responsible for and who spend their time on the execution and supervision of development activities as well as major capital and/or renovation projects. Cash and Cash Equivalents The Company considers all demand deposits, money market accounts and investments in certificates of deposit and repurchase agreements purchased with a maturity of three months or less at the date of purchase to be cash equivalents. The Company maintains its cash and cash equivalents at financial institutions. The combined account balances at one or more institutions typically exceed the Federal Depository Insurance Corporation (“FDIC”) insurance coverage, and, as a result, there is a concentration of credit risk related to amounts on deposit in excess of FDIC insurance coverage. The Company believes that the risk is not significant, as the Company does not anticipate the financial institutions’ non-performance. Fair Value of Financial Instruments, Including Derivative Instruments The valuation of financial instruments requires the Company to make estimates and judgments that affect the fair value of the instruments. The Company, where possible, bases the fair values of its financial instruments, including its derivative instruments, on listed market prices and third party quotes. Where these are not available, the Company bases its estimates on current instruments with similar terms and maturities or on other factors relevant to the financial instruments. In the normal course of business, the Company is exposed to the effect of interest rate changes. The Company seeks to manage these risks by following established risk management policies and procedures including the use of derivatives to hedge interest rate risk on debt instruments. The Company may also use derivatives to manage commodity prices in the daily operations of the business. The Company has a policy of only entering into contracts with major financial institutions based upon their credit ratings and other factors. When viewed in conjunction with the underlying and offsetting exposure that the derivatives are designed to hedge, the Company has not sustained a material loss from these instruments nor does it anticipate any material adverse effect on its net income or financial position in the future from the use of derivatives it currently has in place. The Company recognizes all derivatives as either assets or liabilities in the consolidated balance sheets and measures those instruments at fair value. In addition, fair value adjustments will affect either shareholders’ equity/partners’ capital or net income depending on whether the derivative instruments qualify as a hedge for accounting purposes and, if so, the nature of the hedging activity. When the terms of an underlying transaction are modified, or when the underlying transaction is terminated or completed, all changes in the fair value of the instrument are marked-to-market with changes in value included in net income each period until the instrument matures. Any derivative instrument used for risk management that does not meet the hedging criteria is marked-to-market each period. The Company does not use derivatives for trading or speculative purposes. Revenue Recognition Rental income attributable to residential leases is recorded on a straight-line basis, which is not materially different than if it were recorded when due from residents and recognized monthly as it was earned. Leases entered into between a resident and a property for the rental of an apartment unit are generally year-to-year, renewable upon consent of both parties on an annual or monthly basis. Rental income attributable to retail/commercial leases is also recorded on a straight-line basis. Retail/commercial leases generally have five to ten year lease terms with market based renewal options. Fee and asset management revenue and interest income are recorded on an accrual basis. Share-Based Compensation The Company expenses share-based compensation such as restricted shares, restricted units and share options. Any common share of beneficial interest, $0.01 par value per share (the “Common Shares”) issued pursuant to EQR’s incentive equity compensation and employee share purchase plans will result in ERPOP issuing units of partnership interest (“OP Units”) to EQR on a one-for-one basis, with ERPOP receiving the net cash proceeds of such issuances. See Note 12 for further discussion. The fair value of the option grants are recognized over the requisite service/vesting period of the options. The fair value for the Company’s share options was estimated at the time the share options were granted using the Black-Scholes option pricing model with the primary grant in each year having the following weighted average assumptions: 2018 2017 2016 Expected volatility (1) 14.8 % 15.3 % 26.3 % Expected life (2) 5 years 5 years 5 years Expected dividend yield (3) 3.09 % 3.08 % 3.04 % Risk-free interest rate (4) 2.52 % 1.93 % 1.27 % Option valuation per share $ 6.15 $ 5.86 $ 13.02 (1) Expected volatility – For the 2018 and 2017 grants, estimated based on the historical five-year volatility (the period matching the expected life) of EQR’s share price measured on a monthly basis. For the 2016 grant, estimated based on the historical ten-year volatility of EQR’s share price measured on a monthly basis. This change in estimate reflects the Company’s belief that the historical five-year period provides a better estimate of the expected volatility in EQR shares over the expected life of the options. (2) Expected life – Approximates the actual weighted average life of all share options granted since the Company went public in 1993. (3) Expected dividend yield – Calculated by averaging the historical annual yield on EQR shares for a period matching the expected life of each grant, with the annual yield calculated by dividing actual regular dividends (excluding any special dividends) by the average price of EQR’s shares in a given year. (4) Risk-free interest rate – The most current U.S. Treasury rate available prior to the grant date for a period matching the expected life of each grant. The valuation method and assumptions are the same as those the Company used in accounting for option expense in its consolidated financial statements. The Black-Scholes option valuation model was developed for use in estimating the fair value of traded options that have no vesting restrictions and are fully transferable. This model is only one method of valuing options. Because the Company’s share options have characteristics significantly different from those of traded options, and because changes in the subjective input assumptions can materially affect the fair value estimate, the actual value of the options to the recipient may be significantly different. Income and Other Taxes Due to the structure of EQR as a REIT and the nature of the operations of its operating properties, no provision for federal income taxes has been made at the EQR level. In addition, ERPOP generally is not liable for federal income taxes as the partners recognize their proportionate share of income or loss in their tax returns; therefore no provision for federal income taxes has been made at the ERPOP level. Historically, the Company has generally only incurred certain state and local income, excise and franchise taxes. The Company has elected taxable REIT subsidiary (“TRS”) status for certain of its corporate subsidiaries and as a result, these entities will incur both federal and state income taxes on any taxable income of such entities after consideration of any net operating losses. Deferred tax assets and liabilities were recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases in the comparable periods. These assets and liabilities were measured using enacted tax rates for which the temporary differences were expected to be recovered or settled. The effects of changes in tax rates on deferred tax assets and liabilities were recognized in earnings in the period enacted. The Company’s deferred tax assets were generally the result of tax affected suspended interest deductions, net operating losses, differing depreciable lives on capitalized assets and the timing of expense recognition for certain accrued liabilities. The Company elected REIT status for its primary TRS upon filing the 2016 tax return in the third quarter of 2017, with the election retroactive to January 1, 2016. As a result, the Company wrote-off its deferred tax assets, which were fully reserved, in the third quarter of 2017. In December 2017, the President signed into law H.R. 1, informally titled the Tax Cuts and Jobs Act (the “Tax Act”). As of December 31, 2018, the Tax Act did not have a material impact on our REIT or subsidiary entities, our ability to continue to qualify as a REIT or on our results of operations. The Company provided for income, franchise and excise taxes allocated as follows in the consolidated statements of operations and comprehensive income for the years ended December 31, 2018, 2017 and 2016 (amounts in thousands): Year Ended December 31, 2018 2017 2016 Income and other tax expense (benefit) (1) $ 878 $ 478 $ 1,613 Discontinued operations, net (2) — — 12 Provision for income, franchise and excise taxes (3) $ 878 $ 478 $ 1,625 (1) Primarily includes state and local income, excise and franchise taxes. (2) Primarily represents state and local income, excise and franchise taxes on operating properties sold prior to January 1, 2014 and included in discontinued operations. The amounts included in discontinued operations for the year ended December 31, 2016 represent trailing activity for properties sold in 2013 and prior years. None of the properties sold during the years ended December 31, 2018, 2017 and 2016 met the criteria for reporting discontinued operations. (3) All provisions for income tax amounts are current and none are deferred. During the years ended December 31, 2018, 2017 and 2016, the Company’s tax treatment of dividends and distributions were as follows (unaudited): Year Ended December 31, 2018 (1) 2017 (2) 2016 Tax treatment of dividends and distributions: Ordinary dividends $ 1.84454 $ 1.22126 $ 0.722 Long-term capital gain 0.21423 0.18959 9.176 Unrecaptured section 1250 gain 0.06498 0.10040 3.117 Dividends and distributions per Common Share/Unit outstanding $ 2.12375 $ 1.51125 $ 13.015 (1) The Company’s fourth quarter 2018 dividends and distributions of $0.54 per Common Share/Unit outstanding will be included as taxable income in calendar year 2019. (2) The Company’s fourth quarter 2017 dividends and distributions of $0.50375 per Common Share/Unit outstanding will be included as taxable income in calendar year 2018. The unaudited cost of land and depreciable property, net of accumulated depreciation, for federal income tax purposes as of December 31, 2018 and 2017 was approximately $14.0 billion and $14.8 billion, respectively. Noncontrolling Interests A noncontrolling interest in a subsidiary (minority interest) is an ownership interest in the consolidated entity that should be reported as equity in the consolidated financial statements and separate from the parent company’s equity. In addition, consolidated net income is required to be reported at amounts that include the amounts attributable to both the parent and the noncontrolling interest and the amount of consolidated net income attributable to the parent and the noncontrolling interest are required to be disclosed on the face of the consolidated statements of operations and comprehensive income. See Note 3 for further discussion. Operating Partnership: Net income is allocated to noncontrolling interests based on their respective ownership percentage of the Operating Partnership. The ownership percentage is calculated by dividing the number of OP Units held by the noncontrolling interests by the total OP Units held by the noncontrolling interests and EQR. Issuance of additional Common Shares and OP Units changes the ownership interests of both the noncontrolling interests and EQR. Such transactions and the related proceeds are treated as capital transactions. Partially Owned Properties: The Company reflects noncontrolling interests in partially owned properties on the balance sheet for the portion of properties consolidated by the Company that are not wholly owned by the Company. The earnings or losses from those properties attributable to the noncontrolling interests are generally based on ownership percentage and are reflected as noncontrolling interests in partially owned properties in the consolidated statements of operations and comprehensive income. Partners’ Capital The “Limited Partners” of ERPOP include various individuals and entities that contributed their properties to ERPOP in exchange for OP Units. The “General Partner” of ERPOP is EQR. Net income is allocated to the Limited Partners based on their respective ownership percentage of ERPOP. The ownership percentage is calculated by dividing the number of OP Units held by the Limited Partners by the total OP Units held by the Limited Partners and the General Partner. Issuance of additional Common Shares and OP Units changes the ownership interests of both the Limited Partners and EQR. Such transactions and the related proceeds are treated as capital transactions. Redeemable Noncontrolling Interests – Operating Partnership / Redeemable Limited Partners The Company classifies Redeemable Noncontrolling Interests – Operating Partnership / Redeemable Limited Partners in the mezzanine section of the consolidated balance sheets for the portion of OP Units that EQR is required, either by contract or securities law, to deliver registered Common Shares to the exchanging OP Unit holder. The redeemable noncontrolling interest units / redeemable limited partner units are adjusted to the greater of carrying value or fair market value based on the Common Share price of EQR at the end of each respective reporting period. See Note 3 for further discussion. Use of Estimates In preparation of the Company’s financial statements in conformity with accounting principles generally accepted in the United States, management makes estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. Reclassifications Certain reclassifications considered necessary for a fair presentation have been made to the prior period financial statements in order to conform to the current year presentation. These reclassifications have not changed the results of operations or equity/capital. Recently Issued Accounting Pronouncements In • Lessors – Leases are accounted for using an approach that is substantially equivalent to existing guidance for operating, sales-type and financing leases, but aligned with the new revenue recognition standard. Lessors are required to allocate lease payments to separate lease and non-lease components of each lease agreement, with the non-lease components evaluated under the new revenue recognition standard. • Lessees – Leases are accounted for using a dual approach, classifying leases as either operating or finance based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee. This classification determines whether the lease expense is recognized on a straight-line basis over the term of the lease (for operating leases) or based on an effective interest method (for finance leases). A lessee is also required to record a right-of-use asset and a lease liability on its balance sheet for all leases with a term of greater than 12 months regardless of their classification as operating or finance leases. Leases with a term of 12 months or less are accounted for similar to existing guidance for operating leases. The new standard was effective for the Company effective January 1, 2019. The new standard was adopted using a modified retrospective method and the Company applied the new guidance as of the adoption date and elected certain practical expedients as described below. The Company is the lessor for its residential and retail/commercial leases and these leases will continue to be accounted for as operating leases under the new standard. Therefore, the Company did not have significant changes in the accounting for its lease revenues. The Company is the lessee under various corporate office and ground leases, which will be recognized as right of use assets and related lease liabilities on its consolidated balance sheets in the first quarter of 2019. The Company’s corporate office leases where it is the lessee will continue to be accounted for as operating leases under the new standard. Based on its election of the practical expedients, the Company was not required to reassess the classification of existing ground leases and therefore these leases will continue to be accounted for as operating leases. However, in the event we materially modify existing ground leases and/or enter into new ground leases after adoption of the new standard, such leases will likely be classified as finance leases. The Company will record right of use assets and related lease liabilities to its opening balance sheet upon adoption of the new standard on January 1, 2019 that will approximate $300.0 million. The Company has determined the approximate discount rate ranges of 3.3% to 3.9% for corporate office leases and 4.4% to 5.5% for ground leases. The discount rates were determined using the Company’s borrowing rates (actual pricing through 30 years and other long-term market rates). In July 2018, the FASB issued an amendment to the new leases standard, which includes a practical expedient that provides lessors an option not to separate lease and non-lease components when certain criteria are met and instead account for those components as a single component under the new leases standard. The amendment also provides a transition option that permits the application of the new guidance as of the adoption date rather than to all periods presented. The Company elected the practical expedient to account for both its lease and non-lease components as a single component under the leases standard and elected the new transition option as of the date of adoption effective January 1, 2019. In June 2016, the FASB In August 2017, the FASB issued a final standard which makes changes to the hedge accounting model to enable entities to better portray their risk management activities in the financial statements. The new standard expands an entity’s ability to hedge nonfinancial and financial risk components, reduces complexity in fair value hedges of interest rate risk and eases certain documentation and assessment requirements. The new standard also eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of any hedging instrument to be presented in the same income statement line as the hedged instrument. The Company adopted this new standard as required effective January 1, 2019 and it did not have a material effect on its consolidated results of operations or financial position. Recently Adopted Accounting Pronouncements In FASB Revenue from Contracts with Customers any, For the remaining approximately 6% of rental income that is subject to the new revenue recognition standard, the Company’s disaggregated revenue streams are disclosed in the table below for the year ended December 31, 2018. These revenue streams have the same timing and pattern of revenue recognition across our reportable segments, with consistent allocations between the leasing and revenue recognition standards. The revenue streams and percentages are comparable with the percentage of rental income for the years ended December 31, 2017 and 2016. The following table presents the disaggregation of revenue streams of our rental income for the year ended December 31, 2018 (amounts in thousands): Year Ended December 31, 2018 Revenue Stream Applicable Standard Amount of Rental Income Percentage of Rental Income Leasing revenue Leases $ 2,418,168 93.8 % Utility recoveries (“RUBS”) Revenue Recognition 63,218 2.5 % Parking revenue Revenue Recognition 26,743 1.0 % Other revenue Revenue Recognition 69,552 2.7 % Rental income $ 2,577,681 100.0 % Additionally, as part of the new revenue recognition standard, the FASB issued amendments related to partial sales of real estate. Adoption of the new partial sales standard did not result in a change of accounting for the Company related to its disposition process. We concluded that the Company’s typical dispositions will continue to meet the criteria for sale and associated profit recognition under both new standards. In January 2016, the FASB issued a new standard which requires companies to measure all equity securities with readily determinable fair values at fair value on the balance sheet, with changes in fair value recognized in net income. The Company adopted this new standard as required effective January 1, 2018 and it did not have a material effect on its consolidated results of operations or financial position. In FASB • Cash payments related to debt prepayments or extinguishment costs are to be classified within financing • The portion of the cash payment made to settle a zero-coupon bond or a bond with an insignificant cash coupon attributable to accreted interest related to a debt discount is to be classified as a cash outflow within operating activities, and the portion attributable to the principal is to be classified within financing • Insurance settlement proceeds are to be classified based on the nature of the • Companies must elect to classify distributions received from equity method investees using either a cumulative earnings approach or a look-through approach and the election must be disclosed; • Restricted Total The While overall cash flows did not change, there were changes between cash flow classifications due primarily to the debt prepayment penalties that the Company had incurred in comparative periods. In FASB Other The Company is the controlling partner in various consolidated partnerships owning 17 properties consisting of 3,535 apartment units having a noncontrolling interest deficit balance of $2.3 million at December 31, 2018. The Company is required to make certain disclosures regarding noncontrolling interests in consolidated limited-life subsidiaries. Of the consolidated entities described above, the Company is the controlling partner in limited-life partnerships owning four properties having a noncontrolling interest deficit balance of $9.6 million. These four partnership agreements contain provisions that require the partnerships to be liquidated through the sale of their assets upon reaching a date specified in each respective partnership agreement. The Company, as controlling partner, has an obligation to cause the property owning partnerships to distribute the proceeds of liquidation to the Noncontrolling Interests in these Partially Owned Properties only to the extent that the net proceeds received by the partnerships from the sale of their assets warrant a distribution based on the partnership agreements. As of December 31, 2018 the Company estimates the value of Noncontrolling Interest distributions for these four properties would have been approximately $70.4 million (“Settlement Value”) had the partnerships been liquidated. This Settlement Value is based on estimated third party consideration realized by the partnerships upon disposition of the four Partially Owned Properties and is net of all other assets and liabilities, including yield maintenance on the mortgages encumbering the properties, that would have been due on December 31, 2018 had those mortgages been prepaid. Due to, among other things, the inherent uncertainty in the sale of real estate assets, the amount of any potential distribution to the Noncontrolling Interests in the Company’s Partially Owned Properties is subject to change. To the extent that the partnerships’ underlying assets are worth less than the underlying liabilities, the Company has no obligation to remit any consideration to the Noncontrolling Interests in these Partially Owned Properties.

Equity, Capital and Other Inter

Equity, Capital and Other Interests	12 Months Ended
	Dec. 31, 2018
Equity Capital And Other Interests [Abstract]
Equity, Capital and Other Interests	3. Equity, Capital and Other Interests Equity and Redeemable Noncontrolling Interests of Equity Residential The following tables present the changes in the Company’s issued and outstanding Common Shares and “Units” (which includes OP Units and restricted units) for the years ended December 31, 2018, 2017 and 2016: 2018 2017 2016 Common Shares Common Shares outstanding at January 1, 368,018,082 365,870,924 364,755,444 Common Shares Issued: Conversion of OP Units 131,477 1,149,284 88,838 Exercise of share options 1,056,388 846,137 815,044 Employee Share Purchase Plan (ESPP) 75,414 68,286 63,909 Restricted share grants, net 123,800 83,451 147,689 Common Shares outstanding at December 31, 369,405,161 368,018,082 365,870,924 Units Units outstanding at January 1, 13,768,438 14,626,075 14,427,164 Restricted unit grants, net 267,074 291,647 287,749 Conversion of OP Units to Common Shares (131,477 ) (1,149,284 ) (88,838 ) Units outstanding at December 31, 13,904,035 13,768,438 14,626,075 Total Common Shares and Units outstanding at December 31, 383,309,196 381,786,520 380,496,999 Units Ownership Interest in Operating Partnership 3.6 % 3.6 % 3.8 % The equity positions of various individuals and entities that contributed their properties to the Operating Partnership in exchange for OP Units, as well as the equity positions of the holders of restricted units, are collectively referred to as the “Noncontrolling Interests – Operating Partnership”. Subject to certain exceptions (including the “book-up” requirements of restricted units), the Noncontrolling Interests – Operating Partnership may exchange their Units with EQR for Common Shares on a one-for-one basis. The carrying value of the Noncontrolling Interests – Operating Partnership (including redeemable interests) is allocated based on the number of Noncontrolling Interests – Operating Partnership Units in total in proportion to the number of Noncontrolling Interests – Operating Partnership Units in total plus the number of Common Shares. Net income is allocated to the Noncontrolling Interests – Operating Partnership based on the weighted average ownership percentage during the period. The Operating Partnership has the right but not the obligation to make a cash payment instead of issuing Common Shares to any and all holders of Noncontrolling Interests – Operating Partnership Units requesting an exchange of their OP Units with EQR. Once the Operating Partnership elects not to redeem the Noncontrolling Interests – Operating Partnership Units for cash, EQR is obligated to deliver Common Shares to the exchanging holder of the Noncontrolling Interests – Operating Partnership Units. The Noncontrolling Interests – Operating Partnership Units are classified as either mezzanine equity or permanent equity. If EQR is required, either by contract or securities law, to deliver registered Common Shares, such Noncontrolling Interests – Operating Partnership are differentiated and referred to as “Redeemable Noncontrolling Interests – Operating Partnership”. Instruments that require settlement in registered shares cannot be classified in permanent equity as it is not always completely within an issuer’s control to deliver registered shares. Therefore, settlement in cash is assumed and that responsibility for settlement in cash is deemed to fall to the Operating Partnership as the primary source of cash for EQR, resulting in presentation in the mezzanine section of the balance sheet. The Redeemable Noncontrolling Interests – Operating Partnership are adjusted to the greater of carrying value or fair market value based on the Common Share price of EQR at the end of each respective reporting period. EQR has the ability to deliver unregistered Common Shares for the remaining portion of the Noncontrolling Interests – Operating Partnership Units that are classified in permanent equity at December 31, 2018 and 2017. The carrying value of the Redeemable Noncontrolling Interests – Operating Partnership is allocated based on the number of Redeemable Noncontrolling Interests – Operating Partnership Units in proportion to the number of Noncontrolling Interests – Operating Partnership Units in total. Such percentage of the total carrying value of Units which is ascribed to the Redeemable Noncontrolling Interests – Operating Partnership is then adjusted to the greater of carrying value or fair market value as described above. As of December 31, 2018, the Redeemable Noncontrolling Interests – Operating Partnership have a redemption value of approximately $379.1 million, which represents the value of Common Shares that would be issued in exchange for the Redeemable Noncontrolling Interests – Operating Partnership Units. The following table presents the changes in the redemption value of the Redeemable Noncontrolling Interests – Operating Partnership for the years ended December 31, 2018, 2017 and 2016, respectively (amounts in thousands): 2018 2017 2016 Balance at January 1, $ 366,955 $ 442,092 $ 566,783 Change in market value 13,922 (41,916 ) (115,093 ) Change in carrying value (1,771 ) (33,221 ) (9,598 ) Balance at December 31, $ 379,106 $ 366,955 $ 442,092 Net proceeds from EQR Common Share and Preferred Share (see definition below) offerings are contributed by EQR to ERPOP. In return for those contributions, EQR receives a number of OP Units in ERPOP equal to the number of Common Shares it has issued in the equity offering (or in the case of a preferred equity offering, a number of preference units in ERPOP equal in number and having the same terms as the Preferred Shares issued in the equity offering). As a result, the net offering proceeds from Common Shares and Preferred Shares are allocated between shareholders’ equity and Noncontrolling Interests – Operating Partnership to account for the change in their respective percentage ownership of the underlying equity of ERPOP. The Company’s declaration of trust authorizes it to issue up to 100,000,000 preferred shares of beneficial interest, $0.01 par value per share (the “Preferred Shares”), with specific rights, preferences and other attributes as the Board of Trustees may determine, which may include preferences, powers and rights that are senior to the rights of holders of the Company’s Common Shares. The following table presents the Company’s issued and outstanding Preferred Shares as of December 31, 2018 and 2017: Amounts in thousands Annual Call Dividend Per December 31, December 31, Date (1) Share (2) 2018 2017 Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized: 8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 745,600 shares issued and outstanding as of December 31, 2018 and 2017 12/10/26 $ 4.145 $ 37,280 $ 37,280 $ 37,280 $ 37,280 (1) On or after the call date, redeemable preferred shares may be redeemed for cash at the option of the Company, in whole or in part, at a redemption price equal to the liquidation price per share, plus accrued and unpaid distributions, if any. (2) Dividends on Preferred Shares are payable quarterly. Capital and Redeemable Limited Partners of ERP Operating Limited Partnership The following tables present the changes in the Operating Partnership’s issued and outstanding Units and in the limited partners’ Units for the years ended December 31, 2018, 2017 and 2016: 2018 2017 2016 General and Limited Partner Units General and Limited Partner Units outstanding at January 1, 381,786,520 380,496,999 379,182,608 Issued to General Partner: Exercise of EQR share options 1,056,388 846,137 815,044 EQR’s Employee Share Purchase Plan (ESPP) 75,414 68,286 63,909 EQR’s restricted share grants, net 123,800 83,451 147,689 Issued to Limited Partners: Restricted unit grants, net 267,074 291,647 287,749 General and Limited Partner Units outstanding at December 31, 383,309,196 381,786,520 380,496,999 Limited Partner Units Limited Partner Units outstanding at January 1, 13,768,438 14,626,075 14,427,164 Limited Partner restricted unit grants, net 267,074 291,647 287,749 Conversion of Limited Partner OP Units to EQR Common Shares (131,477 ) (1,149,284 ) (88,838 ) Limited Partner Units outstanding at December 31, 13,904,035 13,768,438 14,626,075 Limited Partner Units Ownership Interest in Operating Partnership 3.6 % 3.6 % 3.8 % The Limited Partners of the Operating Partnership as of December 31, 2018 include various individuals and entities that contributed their properties to the Operating Partnership in exchange for OP Units, as well as the equity positions of the holders of restricted units. Subject to certain exceptions (including the “book-up” requirements of restricted units), Limited Partners may exchange their Units with EQR for Common Shares on a one-for-one basis. The carrying value of the Limited Partner Units (including redeemable interests) is allocated based on the number of Limited Partner Units in total in proportion to the number of Limited Partner Units in total plus the number of General Partner Units. Net income is allocated to the Limited Partner Units based on the weighted average ownership percentage during the period. The Operating Partnership has the right but not the obligation to make a cash payment instead of issuing Common Shares to any and all holders of Limited Partner Units requesting an exchange of their OP Units with EQR. Once the Operating Partnership elects not to redeem the Limited Partner Units for cash, EQR is obligated to deliver Common Shares to the exchanging limited partner. The Limited Partner Units are classified as either mezzanine equity or permanent equity. If EQR is required, either by contract or securities law, to deliver registered Common Shares, such Limited Partner Units are differentiated and referred to as “Redeemable Limited Partner Units”. Instruments that require settlement in registered shares cannot be classified in permanent equity as it is not always completely within an issuer’s control to deliver registered shares. Therefore, settlement in cash is assumed and that responsibility for settlement in cash is deemed to fall to the Operating Partnership as the primary source of cash for EQR, resulting in presentation in the mezzanine section of the balance sheet. The Redeemable Limited Partner Units are adjusted to the greater of carrying value or fair market value based on the Common Share price of EQR at the end of each respective reporting period. EQR has the ability to deliver unregistered Common Shares for the remaining portion of the Limited Partner Units that are classified in permanent equity at December 31, 2018 and 2017. The carrying value of the Redeemable Limited Partner Units is allocated based on the number of Redeemable Limited Partner Units in proportion to the number of Limited Partner Units in total. Such percentage of the total carrying value of Limited Partner Units which is ascribed to the Redeemable Limited Partner Units is then adjusted to the greater of carrying value or fair market value as described above. As of December 31, 2018, the Redeemable Limited Partner Units have a redemption value of approximately $379.1 million, which represents the value of Common Shares that would be issued in exchange for the Redeemable Limited Partner Units. The following table presents the changes in the redemption value of the Redeemable Limited Partners for the years ended December 31, 2018, 2017 and 2016, respectively (amounts in thousands): 2018 2017 2016 Balance at January 1, $ 366,955 $ 442,092 $ 566,783 Change in market value 13,922 (41,916 ) (115,093 ) Change in carrying value (1,771 ) (33,221 ) (9,598 ) Balance at December 31, $ 379,106 $ 366,955 $ 442,092 EQR contributes all net proceeds from its various equity offerings (including proceeds from exercise of options for Common Shares) to ERPOP. In return for those contributions, EQR receives a number of OP Units in ERPOP equal to the number of Common Shares it has issued in the equity offering (or in the case of a preferred equity offering, a number of preference units in ERPOP equal in number and having the same terms as the preferred shares issued in the equity offering). The following table presents the Operating Partnership’s issued and outstanding “Preference Units” as of December 31, 2018 and 2017: Amounts in thousands Annual Call Dividend Per December 31, December 31, Date (1) Unit (2) 2018 2017 Preference Units: 8.29% Series K Cumulative Redeemable Preference Units; liquidation value $50 per unit; 745,600 units issued and outstanding as of December 31, 2018 and 2017 12/10/26 $ 4.145 $ 37,280 $ 37,280 $ 37,280 $ 37,280 (1) On or after the call date, redeemable preference units may be redeemed for cash at the option of the Operating Partnership, in whole or in part, at a redemption price equal to the liquidation price per unit, plus accrued and unpaid distributions, if any, in conjunction with the concurrent redemption of the corresponding Company Preferred Shares. (2) Dividends on Preference Units are payable quarterly. Other EQR and ERPOP currently have an active universal shelf registration statement for the issuance of equity and debt securities that automatically became effective upon filing with the SEC on June 28, 2016 and expires on June 28, 2019. Per the terms of ERPOP’s partnership agreement, EQR contributes the net proceeds of all equity offerings to the capital of ERPOP in exchange for additional OP Units (on a one-for-one Common Share per OP Unit basis) or preference units (on a one-for-one preferred share per preference unit basis). In September 2009, the Company announced the establishment of an At-The-Market (“ATM”) share offering program which would allow EQR to sell Common Shares from time to time into the existing trading market at current market prices as well as through negotiated transactions. Per the terms of ERPOP’s partnership agreement, EQR contributes the net proceeds from all equity offerings to the capital of ERPOP in exchange for additional OP Units (on a one-for-one Common Share per OP Unit basis). The program currently has a maturity of June 28, 2019. EQR has the authority to issue 13.0 million shares but has not issued any shares under this program since September 2012. The Company may repurchase up to 13.0 million Common Shares under its share repurchase program. No open market repurchases have occurred since 2008 and no repurchases of any kind have occurred since February 2014. As of December 31, 2018, EQR has remaining authorization to repurchase up to 13.0 million of its shares under the repurchase program.

Real Estate and Lease Intangibl

Real Estate and Lease Intangibles	12 Months Ended
	Dec. 31, 2018
Real Estate [Abstract]
Real Estate and Lease Intangibles	4. Real Estate and Lease Intangibles The following table summarizes the carrying amounts for the Company’s investment in real estate (at cost) as of December 31, 2018 and 2017 (amounts in thousands): 2018 2017 Land $ 5,875,803 $ 5,996,024 Depreciable property: Buildings and improvements 18,232,625 17,743,042 Furniture, fixtures and equipment 1,722,231 1,548,961 In-Place lease intangibles 481,045 476,359 Projects under development: Land 25,429 43,226 Construction-in-progress 83,980 120,321 Land held for development: Land 61,038 62,538 Construction-in-progress 28,871 36,425 Investment in real estate 26,511,022 26,026,896 Accumulated depreciation (6,696,281 ) (6,040,378 ) Investment in real estate, net $ 19,814,741 $ 19,986,518 The following table summarizes the carrying amounts for the Company’s above and below market ground and retail lease intangibles as of December 31, 2018 and 2017 (amounts in thousands): Description Balance Sheet 2018 2017 Assets Ground lease intangibles – below market Other Assets $ 191,918 $ 191,918 Retail lease intangibles – above market Other Assets 1,260 1,260 Lease intangible assets 193,178 193,178 Accumulated amortization (26,947 ) (22,434 ) Lease intangible assets, net $ 166,231 $ 170,744 Liabilities Ground lease intangibles – above market Other Liabilities $ 2,400 $ 2,400 Retail lease intangibles – below market Other Liabilities 1,710 5,270 Lease intangible liabilities 4,110 7,670 Accumulated amortization (1,704 ) (5,143 ) Lease intangible liabilities, net $ 2,406 $ 2,527 The following table provides a summary of the effect of the amortization for above and below market ground and retail lease intangibles on the Company’s accompanying consolidated statements of operations and comprehensive income for the years ended December 31, 2018, 2017 and 2016 (amounts in thousands): Description Income Statement Location 2018 2017 2016 Ground lease intangible amortization Property and Maintenance $ (4,463 ) $ (4,369 ) $ (4,321 ) Retail lease intangible amortization Rental Income 71 541 895 Total amortization of above/below market lease intangibles $ (4,392 ) $ (3,828 ) $ (3,426 ) The following table provides a summary of the aggregate amortization for above and below market ground and retail lease intangibles for each of the next five years (amounts in thousands): 2019 2020 2021 2022 2023 Ground lease intangibles $ (4,463 ) $ (4,463 ) $ (4,463 ) $ (4,463 ) $ (4,463 ) Retail lease intangibles 71 71 71 27 19 Total $ (4,392 ) $ (4,392 ) $ (4,392 ) $ (4,436 ) $ (4,444 ) Acquisitions and Dispositions During the year ended December 31, 2018, the Company acquired the entire equity interest in the following from unaffiliated parties (purchase price in thousands): Properties Apartment Units Purchase Price Rental Properties – Consolidated (1) 5 1,478 $ 707,005 Total 5 1,478 $ 707,005 (1) Purchase price includes an allocation of approximately $113.7 million to land and $594.4 million to depreciable property (inclusive of capitalized closing costs). During the year ended December 31, 2017, the Company acquired the entire equity interest in the following from unaffiliated parties (purchase price in thousands): Properties Apartment Units Purchase Price Rental Properties – Consolidated (1) 4 947 $ 468,050 Total 4 947 $ 468,050 (1) Purchase price includes an allocation of approximately $68.3 million to land, $386.2 million to depreciable property (inclusive of capitalized closing costs) and $13.7 million to ground lease intangible (included in other assets). For one of the property acquisitions, the Company owns the building and improvements and leases the land underlying the improvements under a long-term ground lease that expires in 2113. This property is consolidated and reflected as a real estate asset while the ground lease is accounted for as an operating lease. During the year ended December 31, 2018, the Company disposed of the following to unaffiliated parties (sales price in thousands): Properties Apartment Units Sales Price Rental Properties – Consolidated 5 1,292 $ 706,120 Land Parcels (one) — — 2,700 Total 5 1,292 $ 708,820 The Company recognized a net gain on sales of real estate properties of approximately $256.8 million and a net gain on sales of land parcels of approximately $1.0 million on the above sales. During the year ended December 31, 2017, the Company disposed of the following to unaffiliated parties (sales price in thousands): Properties Apartment Units Sales Price Rental Properties – Consolidated 5 1,194 $ 354,950 Land Parcels (one) — — 33,450 Total 5 1,194 $ 388,400 The Company recognized a net gain on sales of real estate properties of approximately $157.1 million and a net gain on sales of land parcels of approximately $19.2 million on the above sales. Impairment During the year ended December 31, 2018, the Company recorded an approximate $0.7 million non-cash asset impairment charge on a property located in the San Francisco market due to physical property damage as a result of a fire at one of the buildings at the property. During the year ended December 31, 2017, the Company recorded an approximate $1.7 million non-cash asset impairment charge on a land parcel that was being marketed for sale, which is included in land held for development on the consolidated balance sheets and included in the non-same store/other segment discussed in Note 17. The charge was the result of an analysis of the parcel’s estimated fair value (determined using internally developed models based on market assumptions and potential sales data from the marketing process) compared to its current capitalized carrying value. The parcel now has a carrying value of $0.2 million.

Commitments to Acquire_Dispose

Commitments to Acquire/Dispose of Real Estate	12 Months Ended
	Dec. 31, 2018
Commitments To Acquire Dispose Of Real Estate [Abstract]
Commitments to Acquire/Dispose of Real Estate	5. Commitments to Acquire/Dispose of Real Estate The Company has not entered into any separate agreements to acquire rental properties or land parcels as of the date of this filing. The Company has entered into separate agreements to dispose of the following (sales price in thousands): Properties Apartment Units Sales Price Rental Properties - Consolidated 1 266 $ 237,500 Land Parcels (one) — — 1,900 Total 1 266 $ 239,400 The closing of these pending transactions are subject to certain conditions and restrictions, therefore, there can be no assurance that these transactions will be consummated or that the final terms will not differ in material respects from those summarized above. See Note 18 for discussion of the properties acquired or disposed of, if any, subsequent to December 31, 2018.

Investments in Partially Owned

Investments in Partially Owned Entities	12 Months Ended
	Dec. 31, 2018
Investments In Partially Owned Entities [Abstract]
Investments in Partially Owned Entities	6. Investments in Partially Owned Entities The Company has co-invested in various properties with unrelated third parties which are either consolidated or accounted for under the equity method of accounting (unconsolidated). Consolidated Variable Interest Entities (“VIEs”) In accordance with accounting standards for consolidation of VIEs, the Company consolidates ERPOP on EQR’s financial statements. As the sole general partner of ERPOP, EQR has exclusive control of ERPOP’s day-to-day management. The limited partners are not able to exercise substantive kick-out or participating rights. As a result, ERPOP qualifies as a VIE. EQR has a controlling financial interest in ERPOP and, thus, is ERPOP’s primary beneficiary. EQR has the power to direct the activities of ERPOP that most significantly impact ERPOP’s economic performance as well as the obligation to absorb losses or the right to receive benefits from ERPOP that could potentially be significant to ERPOP. The Company has various equity interests in certain joint ventures owning 17 properties containing 3,535 apartment units. The Company is the general partner or managing member of these joint ventures and is responsible for managing the operations and affairs of the joint ventures as well as making all decisions regarding the businesses of the joint ventures. The limited partners or non-managing members are not able to exercise substantive kick-out or participating rights. As a result, the joint ventures qualify as VIEs. The Company has a controlling financial interest in the VIEs and, thus, is the VIEs’ primary beneficiary. The Company has both the power to direct the activities of the VIEs that most significantly impact the VIEs’ economic performance as well as the obligation to absorb losses or the right to receive benefits from the VIEs that could potentially be significant to the VIEs. As a result, the joint ventures are required to be consolidated on the Company’s financial statements. The consolidated assets and liabilities related to the joint ventures were approximately $71 . million and $313. million, respectively, at December 31, 2018 and approximately $518.9 million and $307.0 million, respectively, at December 31, 2017. Investments in Unconsolidated Entities The following table and information summarizes the Company’s investments in unconsolidated entities, which are accounted for under the equity method of accounting as the requirements for consolidation are not met, as of December 31, 2018 December 31, 2017 December 31, 2018 December 31, 2017 Ownership Percentage Investments in Unconsolidated Entities: Wisconsin Place Developer (VIE) (1) $ 42,365 $ 44,451 33.3% Operating Properties (Non-VIE) (2) 10,494 12,367 20.0% Other 5,490 1,436 Varies Investments in Unconsolidated Entities $ 58,349 $ 58,254 (1) Represents an unconsolidated interest in an entity that owns the land underlying one of the consolidated joint venture properties noted above and owns and operates a related parking facility. The joint venture, as a limited partner, does not have substantive kick-out or participating rights in the entity. As a result, the entity qualifies as a VIE. The joint venture does not have a controlling financial interest in the VIE and is not the VIE’s primary beneficiary. The joint venture does not have the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance or the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE. As a result, the entity that owns the land and owns and operates the parking facility is unconsolidated and recorded using the equity method of accounting. (2) Includes two joint ventures under separate agreements with the same partner totaling 945 apartment units.

Restricted Deposits

Restricted Deposits	12 Months Ended
	Dec. 31, 2018
Deposits Restricted [Abstract]
Restricted Deposits	7. Restricted Deposits The following table presents the Company’s restricted deposits as of December 31, 2018 and 2017 (amounts in thousands): December 31, 2018 December 31, 2017 Mortgage escrow deposits: Real estate taxes and insurance $ 876 $ 845 Replacement reserves 8,641 8,347 Mortgage principal reserves/sinking funds 9,754 3,167 Other 852 852 Mortgage escrow deposits 20,123 13,211 Restricted cash: Earnest money on pending acquisitions 5,000 750 Restricted deposits on real estate investments 540 58 Resident security and utility deposits 35,659 35,183 Other 7,549 913 Restricted cash 48,748 36,904 Restricted deposits $ 68,871 $ 50,115

Debt

Debt	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Debt	8. Debt EQR does not have any indebtedness as all debt is incurred by the Operating Partnership. EQR guarantees the Operating Partnership’s revolving credit facility up to the maximum amount and for the full term of the facility. Weighted average interest rates noted below for the years ended December 31, 2018 and 2017 are net of the effect of any derivative instruments. Mortgage Notes Payable As of December 31, 2018, the Company had outstanding mortgage debt of approximately $2.4 billion. During the year ended December 31, 2018, the Company: • Repaid $550.0 million of 6.08% mortgage debt held in a Fannie Mae loan pool maturing in 2020 and incurred a prepayment penalty of approximately $22.1 million; • Repaid $500.0 million of 5.19% mortgage debt held in a Freddie Mac loan pool at par prior to the October 1, 2019 maturity date; • Repaid $43.7 million of conventional fixed-rate mortgage loans maturing in 2018; • Repaid $254.2 million of various tax-exempt mortgage bonds maturing in 2028 through 2042; • Repaid $6.6 million of scheduled principal repayments on various mortgage debt; and • Re i ssued $96.9 million of floating rate tax-exempt mortgage bonds which mature on April 1, 2042, remarket weekly and are guaranteed by ERPOP. The Company recorded $3.0 million of write-offs of unamortized deferred financing costs during the year ended December 31, 2018 as additional interest expense related to debt extinguishment of mortgages. The Company also recorded $16.3 million of write-offs of net unamortized discounts during the year ended December 31, 2018 as additional interest expense related to debt extinguishment of mortgages. As of December 31, 2018, the Company had $440.7 million of secured debt (primarily tax-exempt bonds) subject to third party credit enhancement. As of December 31, 2018, scheduled maturities for the Company’s outstanding mortgage indebtedness were at various dates through May 28, 2061. At December 31, 2018, the interest rate range on the Company’s mortgage debt was 0.10% to 6.90%. During the year ended December 31, 2018, the weighted average interest rate on the Company’s mortgage debt was 4.15%. The historical cost, net of accumulated depreciation, of encumbered properties was $3.2 billion and $4.4 billion at December 31, 2018 and 2017, respectively. As of December 31, 2017, the Company had outstanding mortgage debt of approximately $3.6 billion. During the year ended December 31, 2017, the Company: • Repaid $300.0 million of 5.987% mortgage debt held in a Fannie Mae loan pool maturing in 2019 and incurred a prepayment penalty of approximately $10.8 million; • Repaid $193.4 million of conventional fixed-rate mortgage loans maturing in 2017 through 2048 and incurred prepayment penalties of approximately $1.5 million; and • Repaid $10.7 million of scheduled principal repayments on various mortgage debt. The Company recorded $0.3 million of write-offs of unamortized deferred financing costs during the year ended December 31, 2017 as additional interest expense related to debt extinguishment of mortgages. The Company also recorded $0.7 million of write-offs of net unamortized premiums during the year ended December 31, 2017 as a reduction of interest expense related to debt extinguishment of mortgages. As of December 31, 2017, the Company had $598.6 million of secured debt (primarily tax-exempt bonds) subject to third party credit enhancement. As of December 31, 2017, scheduled maturities for the Company’s outstanding mortgage indebtedness were at various dates through May 28, 2061. At December 31, 2017, the interest rate range on the Company’s mortgage debt was 0.10% to 6.90%. During the year ended December 31, 2017, the weighted average interest rate on the Company’s mortgage debt was 4.33%. Notes The following tables summarize the Company’s unsecured note balances and certain interest rate and maturity date information as of and for the years ended December 31, 2018 and 2017, respectively: December 31, 2018 (Amounts in thousands) Net Principal Balance Interest Rate Ranges Weighted Average Interest Rate Maturity Date Ranges Fixed Rate Public Notes (1) $ 5,485,884 2.85% - 7.57% 4.37% 2020-2047 Floating Rate Public Notes (1) 447,402 (1) 2.84% 2019 Totals $ 5,933,286 4.25% December 31, 2017 (Amounts in thousands) Net Principal Balance Interest Rate Ranges Weighted Average Interest Rate Maturity Date Ranges Fixed Rate Public Notes (1) $ 4,591,373 2.85% - 7.57% 4.61% 2020-2047 Floating Rate Public Notes (1) 447,439 (1) 1.82% 2019 Totals $ 5,038,812 4.35% (1) Fair value interest rate swaps convert the $450.0 million 2.375% notes due July 1, 2019 to a floating interest rate of 90-Day LIBOR plus 0.61%. The Company’s unsecured public debt contains certain financial and operating covenants including, among other things, maintenance of certain financial ratios. The Company was in compliance with its unsecured public debt covenants for both the years ended December 31, 2018 and 2017. EQR and ERPOP currently have an active universal shelf registration statement for the issuance of equity and debt securities that automatically became effective upon filing with the SEC on June 28, 2016 and expires on June 28, 2019. During the year ended December 31, 2018, the Company: • Issued $500.0 million of ten-year 3.50% unsecured notes, receiving net proceeds of approximately $497.0 million before underwriting fees, hedge termination costs and other expenses, at an all-in effective interest rate of 3.61%; and • Issued $400.0 million of ten-year 4.15% unsecured notes, receiving net proceeds of approximately $399.3 million before underwriting fees, hedge termination costs and other expenses, at an all-in effective interest rate of approximately 3.85%. During the year ended December 31, 2017, the Company: • Repaid $394.1 million of 5.75% unsecured notes at maturity; • Repaid $103.9 million of 7.125% unsecured notes at maturity; • Issued $400.0 million of ten-year 3.25% unsecured notes, receiving net proceeds of approximately $399.3 million before underwriting fees, hedge termination costs and other expenses, at an all-in effective interest rate of 3.32% after termination of four forward starting swaps in conjunction with the issuance (see Note 9 for further discussion); and • Issued $300.0 million of thirty-year 4.00 unsecured notes, receiving net proceeds of approximately $293.2 million before underwriting fees and other expenses, at an all-in effective interest rate of 4.11 . Line of Credit and Commercial Paper In November 2016, the Company replaced its existing $2.5 billion facility with a $2.0 billion unsecured revolving credit facility maturing January 10, 2022. The Company has the ability to increase available borrowings by an additional $750.0 million by adding additional banks to the facility or obtaining the agreement of existing banks to increase their commitments. The interest rate on advances under the facility will generally be LIBOR plus a spread (currently 0.825%), or based on bids received from the lending group, and the Company pays an annual facility fee (currently 0.125%). Both the spread and the facility fee are dependent on the Company’s senior unsecured credit rating. In February 2015, the Company entered into an unsecured commercial paper note program in the United States. The Company may borrow up to a maximum of $500.0 million under this program subject to market conditions. The notes will be sold under customary terms in the United States commercial paper note market and will rank pari passu with all of the Company’s other unsecured senior indebtedness. As of December 31, 2018, there was a balance of $499.2 million outstanding on the commercial paper program ($500.0 million in principal outstanding net of an unamortized discount of $0.8 million). As of December 31, 2017, there was a balance of $299.8 million outstanding on the commercial paper program ($300.0 million in principal outstanding net of an unamortized discount of $0.2 million). The notes bear interest at various floating rates with a weighted average of 2.35% and 1.41% for the years ended December 31, 2018 and 2017, respectively, and a weighted average maturity of 22 days and 18 days as of December 31, 2018 and 2017, respectively. As of December 31, 2018, there were no borrowings outstanding under the revolving credit facility and $6.7 million was restricted/dedicated to support letters of credit. In addition, the Company limits its utilization of the facility in order to maintain liquidity to support its $500.0 million commercial paper program along with certain other obligations. As a result, the Company had approximately $1.40 billion available under the facility at December 31, 2018. During the year ended December 31, 2018, the weighted average interest rate on the revolving credit facility was 2.97%. As of December 31, 2017, there were no borrowings outstanding under the revolving credit facility and $6.6 million was restricted/dedicated to support letters of credit. In addition, the Company limits its utilization of the facility in order to maintain liquidity to support its $500.0 million commercial paper program. As a result, the Company had approximately $1.69 billion available under the facility at December 31, 2017. During the year ended December 31, 2017, the weighted average interest rate on the revolving credit facility was 2.00%. Other In 2017, the Company executed a letter of credit facility with a third party financial institution which is not backed or collateralized by borrowings on the Company’s unsecured revolving credit facility. As of both December 31, 2018 and 2017, there was $9.0 million in letters of credit outstanding on this facility. The following table provides a summary of the aggregate payments of principal on all debt for each of the next five years and thereafter as of December 31, 2018 (amounts in thousands): Year Total 2019 $ 974,954 2020 1,129,292 2021 928,106 2022 266,141 2023 1,331,600 Thereafter 4,282,668 Subtotal 8,912,761 Deferred Financing Costs and Unamortized (Discount) (94,822 ) Total $ 8,817,939

Derivative and Other Fair Value

Derivative and Other Fair Value Instruments	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Derivative and Other Fair Value Instruments	9. Derivative and Other Fair Value Instruments The valuation of financial instruments requires the Company to make estimates and judgments that affect the fair value of the instruments. The Company, where possible, bases the fair values of its financial instruments, including its derivative instruments, on listed market prices and third party quotes. Where these are not available, the Company bases its estimates on current instruments with similar terms and maturities or on other factors relevant to the financial instruments. In the normal course of business, the Company is exposed to the effect of interest rate changes. The Company seeks to manage these risks by following established risk management policies and procedures including the use of derivatives to hedge interest rate risk on debt instruments. The Company may also use derivatives to manage commodity prices in the daily operations of the business. A three-level valuation hierarchy exists for disclosure of fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The three levels are defined as follows: • Level 1 – Inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets. • Level 2 – Inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. • Level 3 – Inputs to the valuation methodology are unobservable and significant to the fair value measurement. The Company’s derivative positions are valued using models developed by the respective counterparty as well as models applied internally by the Company that use as their inputs readily observable market parameters (such as forward yield curves and credit default swap data). Employee holdings other than Common Shares within the supplemental executive retirement plan (the “SERP”) are valued using quoted market prices for identical assets and are included in other assets and other liabilities on the consolidated balance sheets. Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners are valued using the quoted market price of Common Shares. The fair values disclosed for mortgage notes payable and unsecured debt (including its commercial paper and line of credit, if applicable) were calculated using indicative rates provided by lenders of similar loans in the case of mortgage notes payable and the private unsecured debt (including its commercial paper and line of credit, if applicable) and quoted market prices for each underlying issuance in the case of the public unsecured notes. The fair values of the Company’s financial instruments (other than mortgage notes payable, unsecured notes, commercial paper, line of credit and derivative instruments), including cash and cash equivalents and other financial instruments, approximate their carrying or contract value. The following table provides a summary of the carrying and fair values for the Company’s mortgage notes payable and unsecured debt (including its commercial paper and line of credit, if applicable) at December 31, 2018 and 2017, respectively (amounts in thousands): December 31, 2018 December 31, 2017 Carrying Value Estimated Fair Value (Level 2) Carrying Value Estimated Fair Value (Level 2) Mortgage notes payable, net $ 2,385,470 $ 2,352,502 $ 3,618,722 $ 3,615,384 Unsecured debt, net 6,432,469 6,481,426 5,338,569 5,619,744 Total debt, net $ 8,817,939 $ 8,833,928 $ 8,957,291 $ 9,235,128 The following table summarizes the Company’s consolidated derivative instruments at December 31, 2018 (dollar amounts are in thousands): Fair Value Hedges (1) Forward Starting Swaps (2) Current Notional Balance $ 450,000 $ 500,000 Lowest Interest Rate 2.375 % 2.2665 % Highest Interest Rate 2.375 % 3.1163 % Maturity Date 2019 2029 (1) Fair Value Hedges – Converts outstanding fixed rate unsecured notes ($450.0 million 2.375% (2) Forward Starting Swaps – Designed to partially fix interest rates in advance of planned future debt issuances. These swaps have mandatory counterparty terminations in 2020 and are targeted for certain 2019 debt issuances. The following tables provide a summary of the fair value measurements for each major category of assets and liabilities measured at fair value on a recurring basis and the location within the accompanying consolidated balance sheets at December 31, 2018 and 2017, respectively (amounts in thousands): Fair Value Measurements at Reporting Date Using Description Balance Sheet Location 12/31/2018 Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps Other Assets $ 2,000 $ — $ 2,000 $ — Supplemental Executive Retirement Plan Other Assets 134,088 134,088 — — Total $ 136,088 $ 134,088 $ 2,000 $ — Liabilities Derivatives designated as hedging instruments: Interest Rate Contracts: Fair Value Hedges Other Liabilities $ 2,277 $ — $ 2,277 $ — Forward Starting Swaps Other Liabilities 9,851 — 9,851 — Supplemental Executive Retirement Plan Other Liabilities 134,088 134,088 — — Total $ 146,216 $ 134,088 $ 12,128 $ — Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Mezzanine $ 379,106 $ — $ 379,106 $ — Fair Value Measurements at Reporting Date Using Description Balance Sheet Location 12/31/2017 Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps Other Assets $ 5,143 $ — $ 5,143 $ — Supplemental Executive Retirement Plan Other Assets 140,159 140,159 — — Total $ 145,302 $ 140,159 $ 5,143 $ — Liabilities Derivatives designated as hedging instruments: Interest Rate Contracts: Fair Value Hedges Other Liabilities $ 1,597 $ — $ 1,597 $ — Supplemental Executive Retirement Plan Other Liabilities 140,159 140,159 — — Total $ 141,756 $ 140,159 $ 1,597 $ — Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Mezzanine $ 366,955 $ — $ 366,955 $ — The following tables provide a summary of the effect of fair value hedges on the Company’s accompanying consolidated statements of operations and comprehensive income for the years ended December 31, 2018, 2017 and 2016, respectively (amounts in thousands): December 31, 2018 Type of Fair Value Hedge Location of Gain/(Loss) Recognized in Income on Derivative Amount of Gain/(Loss) Recognized in Income on Derivative Hedged Item Income Statement Location of Hedged Item Gain/(Loss) Amount of Gain/(Loss) Recognized in Income on Hedged Item Derivatives designated as hedging instruments: Interest Rate Contracts: Interest Rate Swaps Interest expense $ (680 ) Fixed rate debt Interest expense $ 680 Total $ (680 ) $ 680 December 31, 2017 Type of Fair Value Hedge Location of Gain/(Loss) Recognized in Income on Derivative Amount of Gain/(Loss) Recognized in Income on Derivative Hedged Item Income Statement Location of Hedged Item Gain/(Loss) Amount of Gain/(Loss) Recognized in Income on Hedged Item Derivatives designated as hedging instruments: Interest Rate Contracts: Interest Rate Swaps Interest expense $ (3,454 ) Fixed rate debt Interest expense $ 3,454 Total $ (3,454 ) $ 3,454 December 31, 2016 Type of Fair Value Hedge Location of Gain/(Loss) Recognized in Income on Derivative Amount of Gain/(Loss) Recognized in Income on Derivative Hedged Item Income Statement Location of Hedged Item Gain/(Loss) Amount of Gain/(Loss) Recognized in Income on Hedged Item Derivatives designated as hedging instruments: Interest Rate Contracts: Interest Rate Swaps Interest expense $ (1,798 ) Fixed rate debt Interest expense $ 1,798 Total $ (1,798 ) $ 1,798 The following tables provide a summary of the effect of cash flow hedges on the Company’s accompanying consolidated statements of operations and comprehensive income for the years ended December 31, 2018, 2017 and 2016, respectively (amounts in thousands): Effective Portion Ineffective Portion December 31, 2018 Type of Cash Flow Hedge Amount of Gain/(Loss) Recognized in OCI on Derivative Location of Gain/(Loss) Reclassified from Accumulated OCI into Income Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income Location of Gain/(Loss) Recognized in Income on Derivative Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps $ 5,124 Interest expense $ (18,452 ) Interest expense $ — Total $ 5,124 $ (18,452 ) $ — Effective Portion Ineffective Portion December 31, 2017 Type of Cash Flow Hedge Amount of Gain/(Loss) Recognized in OCI on Derivative Location of Gain/(Loss) Reclassified from Accumulated OCI into Income Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income Location of Gain/(Loss) Recognized in Income on Derivative Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps $ 6,439 Interest expense $ (18,858 ) Interest expense $ — Total $ 6,439 $ (18,858 ) $ — Effective Portion Ineffective Portion December 31, 2016 Type of Cash Flow Hedge Amount of Gain/(Loss) Recognized in OCI on Derivative Location of Gain/(Loss) Reclassified from Accumulated OCI into Income Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income Location of Gain/(Loss) Recognized in Income on Derivative Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps $ (3,989 ) Interest expense $ (41,758 ) Interest expense $ (74 ) Total $ (3,989 ) $ (41,758 ) $ (74 ) As of December 31, 2018 and 2017, there were approximately $65.0 million and $88.6 million in deferred losses, net, included in accumulated other comprehensive income (loss), respectively, related to derivative instruments. Based on the estimated fair values of the net derivative instruments at December 31, 2018, the Company may recognize an estimated $20.9 million of accumulated other comprehensive income (loss) as additional interest expense during the year ending December 31, 2019. In November 2018, the Company received approximately $16.4 million to settle six forward starting swaps in conjunction with the issuance of $400.0 million of ten-year unsecured public notes. The accrued interest of approximately $120,000 was recorded as an increase to interest expense. The remaining $16.5 million will be deferred as a component of accumulated other comprehensive income (loss) and will be recognized as a decrease to interest expense over the first nine years and nine months of the notes. In February 2018, the Company received approximately $1.6 million to settle two forward starting swaps in conjunction with the issuance of $500.0 million of ten-year unsecured public notes. The entire $1.6 million was initially deferred as a component of accumulated other comprehensive income (loss) and will be recognized as a decrease to interest expense over the ten-year term of the notes. In August 2017, the Company received $1.3 million to settle four forward starting swaps in conjunction with the issuance of $400.0 million of ten-year fixed rate public notes. The entire $1.3 million was initially deferred as a component of accumulated other comprehensive income (loss) and will be recognized as a decrease to interest expense over the ten-year term of the notes. In October 2016, the Company paid $4.7 million to settle a forward starting swap in conjunction with the issuance of $500.0 million of ten-year fixed rate public notes. The ineffective portion of approximately $74,000 and accrued interest of approximately $9,000 were recorded as increases to interest expense. The remaining amount of approximately $4.6 million will be deferred as a component of accumulated other comprehensive income (loss) and recognized as an increase to interest expense over the approximate term of the notes.

Earnings Per Share and Earnings

Earnings Per Share and Earnings Per Unit	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share And Earnings Per Unit	10. Earnings Per Share and Earnings Per Unit Equity Residential The following tables set forth the computation of net income per share – basic and net income per share – diluted for the Company (amounts in thousands except per share amounts): Year Ended December 31, 2018 2017 2016 Numerator for net income per share – basic: Income from continuing operations $ 685,192 $ 628,381 $ 4,479,586 Allocation to Noncontrolling Interests – Operating Partnership, net (24,939 ) (22,604 ) (171,491 ) Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (2,718 ) (2,323 ) (16,430 ) Preferred distributions (3,090 ) (3,091 ) (3,091 ) Income from continuing operations available to Common Shares, net of Noncontrolling Interests 654,445 600,363 4,288,574 Discontinued operations, net of Noncontrolling Interests — — 498 Numerator for net income per share – basic $ 654,445 $ 600,363 $ 4,289,072 Numerator for net income per share – diluted: Income from continuing operations $ 685,192 $ 628,381 $ 4,479,586 Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (2,718 ) (2,323 ) (16,430 ) Preferred distributions (3,090 ) (3,091 ) (3,091 ) Income from continuing operations available to Common Shares 679,384 622,967 4,460,065 Discontinued operations, net — — 518 Numerator for net income per share – diluted $ 679,384 $ 622,967 $ 4,460,583 Denominator for net income per share – basic and diluted: Denominator for net income per share – basic 368,052 366,968 365,002 Effect of dilutive securities: OP Units 12,869 12,901 13,827 Long-term compensation shares/units 2,774 2,809 3,163 Denominator for net income per share – diluted 383,695 382,678 381,992 Net income per share – basic $ 1.78 $ 1.64 $ 11.75 Net income per share – diluted $ 1.77 $ 1.63 $ 11.68 Net income per share – basic: Income from continuing operations available to Common Shares, net of Noncontrolling Interests $ 1.78 $ 1.64 $ 11.75 Discontinued operations, net of Noncontrolling Interests — — — Net income per share – basic $ 1.78 $ 1.64 $ 11.75 Net income per share – diluted: Income from continuing operations available to Common Shares $ 1.77 $ 1.63 $ 11.68 Discontinued operations, net — — — Net income per share – diluted $ 1.77 $ 1.63 $ 11.68 Distributions declared per Common Share outstanding $ 2.16 $ 2.015 $ 13.015 ERP Operating Limited Partnership The following tables set forth the computation of net income per Unit – basic and net income per Unit – diluted for the Operating Partnership (amounts in thousands except per Unit amounts): Year Ended December 31, 2018 2017 2016 Numerator for net income per Unit – basic and diluted: Income from continuing operations $ 685,192 $ 628,381 $ 4,479,586 Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (2,718 ) (2,323 ) (16,430 ) Allocation to Preference Units (3,090 ) (3,091 ) (3,091 ) Income from continuing operations available to Units 679,384 622,967 4,460,065 Discontinued operations, net — — 518 Numerator for net income per Unit – basic and diluted $ 679,384 $ 622,967 $ 4,460,583 Denominator for net income per Unit – basic and diluted: Denominator for net income per Unit – basic 380,921 379,869 378,829 Effect of dilutive securities: Dilution for Units issuable upon assumed exercise/vesting of the Company’s long-term compensation shares/units 2,774 2,809 3,163 Denominator for net income per Unit – diluted 383,695 382,678 381,992 Net income per Unit – basic $ 1.78 $ 1.64 $ 11.75 Net income per Unit – diluted $ 1.77 $ 1.63 $ 11.68 Net income per Unit – basic: Income from continuing operations available to Units $ 1.78 $ 1.64 $ 11.75 Discontinued operations, net — — — Net income per Unit – basic $ 1.78 $ 1.64 $ 11.75 Net income per Unit – diluted: Income from continuing operations available to Units $ 1.77 $ 1.63 $ 11.68 Discontinued operations, net — — — Net income per Unit – diluted $ 1.77 $ 1.63 $ 11.68 Distributions declared per Unit outstanding $ 2.16 $ 2.015 $ 13.015

Individually Significant Dispos

Individually Significant Dispositions	12 Months Ended
	Dec. 31, 2018
Discontinued Operations And Disposal Groups [Abstract]
Individually Significant Dispositions	11. Individually Significant Dispositions The Company executed an agreement with controlled affiliates of Starwood Capital Group (“Starwood”) on October 23, 2015 to sell a portfolio of 72 operating properties consisting of 23,262 apartment units located in five markets across the United States for $5.365 billion (the “Starwood Transaction” or “Starwood Portfolio”). The Starwood Portfolio included substantially all of the assets in the Company’s South Florida and Denver (primarily suburban portfolio) The Company concluded that the Starwood Transaction did not qualify for discontinued operations reporting as it did not represent a strategic shift that had a major effect on the Company’s operations and financial results. However, t (see definition in Note 17) represented approximately 1.2% of consolidated NOI (for the approximate one-month period owned in 2016) for the year ended December 31, 2016. Year Ended December 31, 2016 REVENUES Rental income $ 30,785 Total revenues 30,785 EXPENSES Property and maintenance 7,838 Real estate taxes and insurance 2,912 Property management 2 General and administrative 23 Depreciation — Total expenses 10,775 Operating income 20,010 Interest and other income 21 Other expenses — Interest: Expense incurred, net (380 ) Amortization of deferred financing costs (707 ) Income and other tax (expense) benefit (1 ) Net gain (loss) on sales of real estate properties 3,161,097 Income from operations attributable to controlling interests – Operating Partnership 3,180,040 Income from operations attributable to Noncontrolling Interests – Operating Partnership (122,152 ) Income from operations attributable to controlling interests – Company $ 3,057,888

Share Incentive Plans

Share Incentive Plans	12 Months Ended
	Dec. 31, 2018
Share Based Compensation [Abstract]
Share Incentive Plans	12. Share Incentive Plans Any Common Shares issued pursuant to EQR’s incentive equity compensation and employee share purchase plans will result in ERPOP issuing OP Units to EQR on a one-for-one basis with ERPOP receiving the net cash proceeds of such issuances. On June 16, 2011, the shareholders of EQR approved the Company’s 2011 Share Incentive Plan, as amended (the “2011 Plan”). The 2011 Plan originally reserved 12,980,741 Common Shares for issuance, which was subsequently adjusted to 14,725,321 Common Shares in accordance with the provisions of the 2011 Plan as a result of the option adjustments required for the special dividends paid in conjunction with the Starwood Transaction. In conjunction with the approval of the 2011 Plan, no further awards may be granted under the 2002 Share Incentive Plan. The 2011 Plan expires on June 16, 2021. As of December 31, 2018, 4,835,914 shares were available for future issuance. Pursuant to the 2011 Plan and the 2002 Share Incentive Plan, as restated and amended (collectively the “Share Incentive Plans”), officers, trustees and key employees of the Company may be granted share options to acquire Common Shares (“Options”) including non-qualified share options (“NQSOs”), incentive share options (“ISOs”) and share appreciation rights (“SARs”), or may be granted restricted or non-restricted shares/units (including long-term incentive plan awards), subject to conditions and restrictions as described in the Share Incentive Plans. Options, SARs, restricted shares (including long-term incentive plan awards) and restricted units (including long-term incentive plan awards) are sometimes collectively referred to herein as “Awards”. The 2002 Share Incentive Plan, as restated and amended, will terminate at such time as all outstanding Awards have expired or have been exercised/vested. The Board of Trustees may at any time amend or terminate the Share Incentive Plans, but termination will not affect Awards previously granted. Any Options which had vested prior to such a termination would remain exercisable by the holder. The Options are granted at the fair market value of the Company’s Common Shares at the date of grant and generally vest in three equal installments over a three-year period, are exercisable upon vesting and expire ten years from the date of grant (see additional valuation discussion in Note 2). The exercise price for all Options under the Share Incentive Plans is equal to the fair market value of the underlying Common Shares at the time the Option is granted. If employment is terminated prior to vesting, the Options are generally canceled. Options exercised result in new Common Shares being issued on the open market. Restricted shares are granted at the fair market value of the Company’s Common Shares at the date of grant. Restricted shares that have been awarded through December 31, 2018 generally vest three years from the award date. In addition, the Company’s unvested restricted shareholders generally have the same voting rights as any other Common Share holder. During the three-year period of restriction, the Company’s unvested restricted shareholders receive quarterly dividend payments on their shares at the same rate and on the same date as any other Common Share holder. As a result, dividends paid on unvested restricted shares are included as a component of retained earnings (included in general partner’s capital in the Operating Partnership’s financial statements) and have not been considered in reducing net income available to Common Shares/Units in a manner similar to the Company’s preferred share/preference unit dividends for the earnings per share/Unit calculation. If employment is terminated prior to the lapsing of the restriction, the shares are generally canceled. Restricted units are a class of partnership interests that under certain conditions, including vesting, are convertible by the holder into an equal number of OP Units, which are exchangeable by the holder for Common Shares on a one-for-one basis or the cash value of such shares at the option of the Company. In connection with the grant of long-term incentive compensation for services provided during a year, officers of the Company are allowed to choose between restricted shares and restricted units. Restricted units are generally granted at varying discount rates to the fair market value of the Company’s Common Shares at the date of grant due to the book - The Company also allows eligible employees the ability to receive immediately vested Options and allows officers the ability to receive immediately vested restricted units (subject to the book-up provisions described above and a two-year hold restriction) in-lieu of any percentage of their annual cash bonus. In January 2015, the Company revised its executive compensation program for the Chairman, Chief Executive Officer and certain other Executive Officers. In the latest iteration of the program, the long-term portion of the plan will allow these individuals to earn from 0% to 200% of the target number of long-term incentive (“LTI”) awards, payable in the form of restricted shares and/or restricted units, as determined by the Company’s relative and absolute Total Shareholder Return (“TSR”) and Normalized Funds from Operations (“FFO”) results over a forward-looking three-year performance period. The Company’s TSR and Normalized FFO performance will be compared to pre-established quantitative performance metrics. In connection with the grant of LTI plan awards, the individuals are allowed to choose between restricted shares and restricted units. The grant date fair value of the awards is estimated using a Monte Carlo model for the TSR portion of the awards and the resulting expense is recorded regardless of whether the TSR performance measures are achieved, if the required service is delivered. The grant date fair value of the awards is estimated similarly to the restricted share and restricted unit discussion above for the Normalized FFO component and the resulting expense is adjusted based on the final achievement obtained. These awards generally vest three years from the award date. The grant date fair value is amortized into expense over the service period. If the executive is retirement-eligible, the grant date fair value is amortized into expense over the first year. All other awards are amortized into expense over the three year performance/vesting period. In addition, the LTI awards granted as restricted units will receive quarterly partial dividend payments equal to 10% of any common share dividend on the same date as any other OP Unit holder during the three-year performance period. As a result, dividends paid on restricted units are included as a component of Noncontrolling Interests – Operating Partnership/Limited Partners’ capital and have not been considered in reducing net income available to Common Shares/Units in a manner similar to the Company’s preferred share/preference unit dividends for the earnings per share/Unit calculation. The awards granted as restricted shares will not receive dividends during the three-year performance period. At the end of the three-year performance period, cumulative dividends will be paid for the three-year performance period for any restricted shares or restricted units actually earned, less any dividends already paid on the restricted units. If employment is terminated prior to vesting, the restricted shares and restricted units are generally canceled. Once the Company’s absolute and relative TSR and Normalized FFO performance is calculated at the end of the three-year performance period, the executive will earn a certain number of restricted shares and/or restricted units. No payout would be made for any return below 50% of the target performance metric. All Trustees, with the exception of the Company’s non-executive Chairman and employee Trustees, are granted options, restricted shares and/or restricted units that vest one-year from the grant date that corresponds to the term for which he or she has been elected to serve. Since 2016, the non-executive Chairman has only received awards under the LTI plan (see further discussion above). The Company’s Share Incentive Plans provide for certain benefits upon retirement. For employees hired prior to January 1, 2009, retirement generally means the termination of employment (other than for cause): (i) on or after age 62 upon signing a release; or (ii) prior to age 62 after meeting the requirements of the Rule of 70 (described below). For employees hired after January 1, 2009, retirement generally means the termination of employment (other than for cause) after meeting the requirements of the Rule of 70. For Trustees, retirement generally means termination of service on the Board (other than for cause) on or after age 72. The Rule of 70 is met when an employee’s years of service with the Company (which must be at least 15 years) plus his or her age (which must be at least 55 years) on the date of termination equals or exceeds 70 years. In addition, the employee must give the Company at least 6 months’ advance written notice of his or her intention to retire and sign a release upon termination of employment, releasing the Company from customary claims and agreeing to ongoing non-competition and employee non-solicitation provisions. Under the Company’s definitions of retirement, some of its executive officers and its non-executive Chairman are retirement eligible. For employees hired prior to January 1, 2009 who retire at or after age 62 (or for Trustees who retire at or after age 72), such employee’s or Trustee’s unvested restricted shares, restricted units and share options would immediately vest, and share options would continue to be exercisable for the balance of the applicable ten-year option period, as is provided under the Share Incentive Plans. For all other employees (those hired after January 1, 2009 and those hired before such date who choose to retire prior to age 62), upon such retirement under the Rule of 70 definition of retirement of employees, such employee’s unvested restricted shares, restricted units and share options would continue to vest per the original vesting schedule (subject to immediate vesting upon the occurrence of a subsequent change in control of the Company or the employee’s death), and options would continue to be exercisable for the balance of the applicable ten-year option period, subject to the employee’s compliance with the non-competition and employee non-solicitation provisions. The Rule of 70 does not apply to Trustees. For the individuals mentioned above who receive awards under the LTI plan and retire at or after age 62 (age 72 for the Chairman of the Board) or under the Rule of 70, the award would be prorated in proportion to the number of days worked in the first year of the three-year performance period. The individual would not receive any payout of shares or units until the final payout is determined at the end of the three-year performance period. If an employee violates the non-competition and employee non-solicitation provisions after such retirement, all unvested restricted shares, unvested restricted units and unvested and vested share options at the time of the violation would be void, unless otherwise determined by the Compensation Committee of the Board of Trustees. The following tables summarize compensation information regarding the restricted shares, restricted units, share options and Employee Share Purchase Plan (“ESPP”) for the three years ended December 31, 2018, 2017 and 2016 (amounts in thousands): Year Ended December 31, 2018 Compensation Expense Compensation Capitalized Restricted Units/Options In-Lieu of Bonus (1) Compensation Equity Dividends Incurred Restricted shares (2) $ 7,406 $ 852 $ — $ 8,258 $ 754 Restricted units (2) 12,310 36 1,663 14,009 963 Share options 6,683 296 2,755 9,734 — ESPP discount 733 34 — 767 — Total $ 27,132 $ 1,218 $ 4,418 $ 32,768 $ 1,717 Year Ended December 31, 2017 Compensation Expense Compensation Capitalized Restricted Units/Options In-Lieu of Bonus (1) Compensation Equity Dividends Incurred Restricted shares (2) $ 9,209 $ 568 $ — $ 9,777 $ 761 Restricted units (2) 10,214 119 190 10,523 741 Share options 4,893 323 1,619 6,835 — ESPP discount 681 66 — 747 — Total $ 24,997 $ 1,076 $ 1,809 $ 27,882 $ 1,502 Year Ended December 31, 2016 Compensation Expense Compensation Capitalized Restricted Units In-Lieu of Bonus (1) Compensation Equity Dividends Incurred Restricted shares (2) $ 13,539 $ 1,477 $ — $ 15,016 $ 6,494 Restricted units (2) 13,567 591 4,022 18,180 7,762 Share options 2,839 593 — 3,432 — ESPP discount 585 65 — 650 — Total $ 30,530 $ 2,726 $ 4,022 $ 37,278 $ 14,256 (1) The Company allows officers the ability to receive immediately vested restricted units (subject to the book-up provisions described above and a two-year hold restriction) in-lieu of any percentage of their annual cash bonus. Beginning in 2017, the Company allows eligible employees the ability to receive immediately vested share options in-lieu of any percentage of their annual cash bonus. (2) Includes LTI plan awards granted under the executive compensation program. Compensation expense is generally recognized for Awards as follows: • Restricted shares, restricted units and share options – Straight-line method over the vesting period of the options, shares or units regardless of cliff or ratable vesting distinctions. • LTI plan awards – Target amount is recognized under the straight-line method over the vesting period of the shares or units regardless of cliff or ratable vesting distinctions. • ESPP discount – Immediately upon the purchase of common shares each quarter. The Company accelerates the recognition of compensation expense for all Awards for those individuals approaching or meeting the retirement age criteria discussed above. The total compensation expense related to Awards not yet vested at December 31, 2018 is $7.5 million (excluding the accelerated expenses for individuals approaching or meeting the retirement age criteria discussed above), which is expected to be recognized over a weighted average term of 1.31 years. See Note 2 for additional information regarding the Company’s share-based compensation. The table below summarizes the Award activity of the Share Incentive Plans for the three years ended December 31, 2018, 2017 and 2016: Common Shares Subject to Options Weighted Average Exercise Price per Option Restricted Shares Weighted Average Fair Value per Restricted Share Restricted Units Weighted Average Fair Value per Restricted Unit Balance at December 31, 2015 5,734,365 $ 48.04 522,150 $ 63.67 888,725 $ 63.91 Awards granted (1) (5) 154,016 $ 64.99 154,296 $ 75.19 289,273 $ 81.05 Awards exercised/vested (2) (3) (4) (815,044 ) $ 38.01 (217,805 ) $ 57.75 (374,217 ) $ 52.73 Awards forfeited (10,512 ) $ 63.43 (6,607 ) $ 70.73 (1,524 ) $ 86.35 Awards expired (710 ) $ 68.40 — — — — Special dividend adjustment (6) 960,986 N/A — — — — Balance at December 31, 2016 6,023,101 $ 42.05 452,034 $ 70.35 802,257 $ 75.26 Awards granted (1) (5) 1,337,898 $ 60.88 93,867 $ 61.94 291,921 $ 68.57 Awards exercised/vested (2) (3) (4) (846,137 ) $ 37.26 (165,744 ) $ 58.04 (192,644 ) $ 54.16 Awards forfeited (27,547 ) $ 61.85 (10,416 ) $ 72.44 (274 ) $ 75.50 Awards expired (3,483 ) $ 65.91 — — — — Balance at December 31, 2017 6,483,832 $ 46.46 369,741 $ 73.67 901,260 $ 77.61 Awards granted (1) (5) 1,730,942 $ 60.40 129,303 $ 62.25 267,074 $ 61.60 Awards exercised/vested (2) (3) (4) (1,056,388 ) $ 29.05 (194,116 ) $ 77.32 (28,486 ) $ 55.50 Awards forfeited (38,133 ) $ 60.74 (5,503 ) $ 65.77 — $ — Awards expired (8,018 ) $ 59.70 — — — — Balance at December 31, 2018 7,112,235 $ 52.35 299,425 $ 66.52 1,139,848 $ 71.07 (1) The weighted average grant date fair value for Options granted during the years ended December 31, 2018, 2017 and 2016 was $6.17 per share, $5.86 per share and $11.09 per share, respectively. (2) The aggregate intrinsic value of options exercised during the years ended December 31, 2018, 2017 and 2016 was $42.9 million, $25.6 million and $26.2 million, respectively. These values were calculated as the difference between the strike price of the underlying awards and the per share price at which each respective award was exercised. (3) The fair value of restricted shares vested during the years ended December 31, 2018, 2017 and 2016 was $11.5 million, $10.2 million and $15.6 million, respectively. (4) The fair value of restricted units vested during the years ended December 31, 2018, 2017 and 2016 was $1.8 million, $11.7 million and $27.2 million, respectively. (5) Includes LTI plan awards granted under the executive compensation program. (6) In addition to the regular quarterly dividends, the Company paid two special dividends to its shareholders and holders of OP Units of $11.00 per share/unit in the aggregate in 2016. Option holders were not entitled to these special dividends, but pursuant to the terms of the Share Incentive Plans are due equitable adjustments of additional options. The special dividend adjustment’s weighted average exercise price per option is reflected in the activity for 2016 for the awards granted, awards exercised/vested, and awards forfeited and the balance at December 31, 2016. The following table summarizes information regarding options outstanding and exercisable at December 31, 2018 (aggregate intrinsic value is in thousands): Options Weighted Average Remaining Contractual Life in Years Weighted Average Exercise Price Aggregate Intrinsic Value (1) Options Outstanding 7,112,235 5.58 $ 52.35 $ 97,633 Options Exercisable 5,328,020 4.52 $ 49.57 $ 88,031 Vested and expected to vest 7,096,243 5.57 $ 52.33 $ 97,543 (1) The aggregate intrinsic values were calculated as the excess, if any, between the Company’s closing share price of $66.01 per share on December 31, 2018 and the strike price of the underlying awards. As of December 31, 2017 and 2016, 5,336,043 Options (with a weighted average exercise price of $43.24) and 5,610,677 Options (with a weighted average exercise price of $40.91) were exercisable, respectively.

Employee Plans

Employee Plans	12 Months Ended
	Dec. 31, 2018
Employee Service Share Based Compensation Aggregate Disclosures [Abstract]
Employee Plans	13. Employee Plans The Company established an Employee Share Purchase Plan to provide each employee and trustee the ability to annually acquire up to $100,000 of Common Shares of EQR. The Company registered 7,000,000 Common Shares under the ESPP, of which 2,762,463 Common Shares remained available for purchase at December 31, 2018. The Common Shares may be purchased quarterly at a price equal to 85% of the lesser of: (a) the closing price for a share on the last day of such quarter; and (b) the greater of: (i) the closing price for a share on the first day of such quarter, and (ii) the average closing price for a share for all the business days in the quarter. The following table summarizes information regarding the Common Shares issued under the ESPP (the net proceeds noted below were contributed to ERPOP in exchange for OP Units): Year Ended December 31, 2018 2017 2016 (Amounts in thousands except share and per share amounts) Shares issued 75,414 68,286 63,909 Issuance price ranges $47.80 – $57.09 $52.79 – $58.06 $51.85 – $63.37 Issuance proceeds $3,879 $3,744 $3,686 The Company established a defined contribution plan (the “401(k) Plan”) to provide retirement benefits for employees that meet minimum employment criteria. The Company matches dollar for dollar up to the first 4% of eligible compensation that a participant contributes to the 401(k) Plan for all employees except those defined as highly compensated employees, whose match is 3%. Participants are vested in the Company’s contributions over five years. The Company recognized an expense in the amount of $4.9 million, $4.6 million and $4.9 million for the years ended December 31, 2018, 2017 and 2016, respectively. The Company established the SERP to provide certain officers and trustees an opportunity to defer a portion of their eligible compensation in order to save for retirement. The SERP is restricted to investments in Common Shares, certain marketable securities that have been specifically approved and cash equivalents. The deferred compensation liability represented in the SERP and the securities issued to fund such deferred compensation liability are consolidated by the Company and carried on the Company’s balance sheets, and the Company’s Common Shares held in the SERP are accounted for as a reduction to paid in capital (included in general partner’s capital in the Operating Partnership’s financial statements).

Distribution Reinvestment Plan

Distribution Reinvestment Plan	12 Months Ended
	Dec. 31, 2018
Distribution Reinvestment And Share Purchase Plan [Abstract]
Distribution Reinvestment Plan	14. Distribution Reinvestment Plan On September 30, 2014, the Company filed with the SEC a Form S-3 Registration Statement to register 4,790,000 Common Shares pursuant to a Distribution Reinvestment Plan (the “2014 DRIP”), which included the remaining shares available for issuance under a previous registration. The registration was automatically declared effective the same day and will expire when all 4,790,000 shares have been issued. The Company has 4,676,606 Common Shares available for issuance under the 2014 DRIP at December 31, 2018. The 2014 DRIP provides holders of record and beneficial owners of Common Shares and Preferred Shares with a simple and convenient method of reinvesting cash dividends/distributions in additional Common Shares. Common Shares purchased under the 2014 DRIP may, at the option of EQR, be directly issued by EQR or purchased by EQR’s transfer agent in the open market using participants’ funds. The net proceeds from any Common Share issuances are contributed to ERPOP in exchange for OP Units.

Transactions with Related Parti

Transactions with Related Parties	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Transactions with Related Parties	15. Transactions with Related Parties The Company leases its corporate headquarters from an entity controlled by EQR’s Chairman of the Board of Trustees. The lease terminates on January 31, 2022. Amounts incurred for such office space for the years ended December 31, 2018, 2017 and 2016, respectively, were approximately $2.5 million, $2.8 million and $2.7 million. The Company believes these amounts equal market rates for such rental space.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	16. Commitments and Contingencies The Company, as an owner of real estate, is subject to various Federal, state and local environmental laws. Compliance by the Company with existing laws has not had a material adverse effect on the Company. However, the Company cannot predict the impact of new or changed laws or regulations on its current properties or on properties that it may acquire in the future. As of December 31, 2018, the Company does have environmental reserves totaling approximately $4.5 million related to three of its properties. The Company had established a reserve related to various litigation matters associated with its Massachusetts properties and periodically assessed the adequacy of the reserve and made adjustments as necessary. As of December 31, 2018, the matters were resolved for a total payout of $0.9 million and no reserve remains outstanding. The Company does not believe there is any litigation pending or threatened against it that, individually or in the aggregate, may reasonably be expected to have a material adverse effect on the Company. As of December 31, 2018, the Company has three wholly owned projects totaling 690 apartment units in various stages of development with remaining commitments to fund of approximately $414.1 million and estimated completion dates ranging through September 30, 2021, as well as other completed development projects that are in various stages of lease-up or are stabilized. As of December 31, 2018, the Company has two unconsolidated operating properties that are owned with the same third party joint venture partner under separate agreements. The joint venture agreements with this partner are primarily deal-specific regarding profit-sharing, equity contributions, returns on investment, buy-sell agreements and other customary provisions. The buy-sell arrangements contain provisions that provide the right, but not the obligation, for the Company to acquire the partner’s interests or sell its interests at any time following the occurrence of certain pre-defined events described in the joint venture agreements. During the years ended December 31, 2018, 2017 and 2016, total operating lease expense for ground leases and office space, including a portion of real estate taxes, insurance, repairs and utilities, aggregated $27.8 million, $26.6 million and $26.2 million, respectively. The Company has entered into a retirement benefits agreement with its Chairman of the Board of Trustees and deferred compensation agreements with its Vice Chairman and one former chief executive officer. During the years ended December 31, 2018, 2017 and 2016, the Company recognized compensation expense of $0.3 million, $0.4 million and $0.3 million, respectively, related to these agreements. The following table summarizes the Company’s contractual obligations for minimum rent payments under operating leases and deferred compensation for the next five years and thereafter as of December 31, 2018: (Payments)/Receipts Due by Year (in thousands) 2019 2020 2021 2022 2023 Thereafter Total Operating Leases: Minimum Rent Payments (a) $ (16,718 ) $ (16,726 ) $ (16,665 ) $ (14,500 ) $ (14,339 ) $ (953,001 ) $ (1,031,949 ) Minimum Rent Receipts (b) $ 64,790 $ 61,409 $ 57,326 $ 53,193 $ 46,016 $ 172,694 $ 455,428 Other Long-Term Liabilities: Deferred Compensation (c) $ (803 ) $ (1,100 ) $ (1,100 ) $ (1,100 ) $ (975 ) $ (3,810 ) $ (8,888 ) (a) Minimum basic rent due for various office space the Company leases and fixed base rent due on ground leases for 12 properties. (b) Minimum basic rent receipts due for various retail/commercial space where the Company is the lessor. (c) Estimated payments to the Company’s Chairman, Vice Chairman and one former CEO based on actual and estimated retirement dates.

Reportable Segments

Reportable Segments	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Reportable Segments	17. Reportable Segments Operating segments are defined as components of an enterprise that engage in business activities from which they may earn revenues and incur expenses and about which discrete financial information is available that is evaluated regularly by the chief operating decision maker. The chief operating decision maker decides how resources are allocated and assesses performance on a recurring basis at least quarterly. The Company’s primary business is the acquisition, development and management of multifamily residential properties, which includes the generation of rental and other related income through the leasing of apartment units to residents. The chief operating decision maker evaluates the Company’s operating performance geographically by market and both on a same store and non-same store basis. The Company’s geographic same store operating segments located in urban and high density suburban markets represent its reportable segments (the two Denver properties acquired in the third quarter of 2018 are currently included in non–same store). The Company’s operating segments located in its other markets (Phoenix) that are not material have also been included in the tables presented below. The Company’s fee and asset management and development activities are other business activities that do not constitute an operating segment and as such, have been aggregated in the “Other” category in the tables presented below. All revenues are from external customers and there is no customer who contributed 10% or more of the Company’s total revenues during the three years ended December 31, 2018, 2017 and 2016. The primary financial measure for the Company’s rental real estate segment is net operating income (“NOI”), which represents rental income less: 1) property and maintenance expense and 2) real estate taxes and insurance expense (all as reflected in the accompanying consolidated statements of operations and comprehensive income). The Company believes that NOI is helpful to investors as a supplemental measure of its operating performance because it is a direct measure of the actual operating results of the Company’s apartment properties. Revenues for all leases are reflected on a straight-line basis in accordance with GAAP for the current and comparable periods. The following table presents a reconciliation of NOI from our rental real estate specific to continuing operations for the years ended December 31, 2018, 2017 and 2016, respectively (amounts in thousands): Year Ended December 31, 2018 2017 2016 Rental income $ 2,577,681 $ 2,470,689 $ 2,422,233 Property and maintenance expense (429,335 ) (405,281 ) (406,823 ) Real estate taxes and insurance expense (357,814 ) (335,495 ) (317,387 ) Total operating expenses (787,149 ) (740,776 ) (724,210 ) Net operating income $ 1,790,532 $ 1,729,913 $ 1,698,023 The following tables present NOI for each segment from our rental real estate specific to continuing operations for the years ended December 31, 2018, 2017 and 2016, respectively, as well as total assets and capital expenditures at December 31, 2018 and 2017, respectively (amounts in thousands): Year Ended December 31, 2018 Year Ended December 31, 2017 Year Ended December 31, 2016 Rental Income Operating Expenses NOI Rental Income Operating Expenses NOI Rental Income Operating Expenses NOI Same store (1) Los Angeles $ 416,688 $ 119,473 $ 297,215 $ 402,192 $ 114,055 $ 288,137 $ 382,425 $ 111,055 $ 271,370 Orange County 91,650 22,071 69,579 88,527 21,544 66,983 84,590 20,600 63,990 San Diego 91,971 24,023 67,948 88,507 23,073 65,434 84,646 22,366 62,280 Subtotal - Southern California 600,309 165,567 434,742 579,226 158,672 420,554 551,661 154,021 397,640 San Francisco 442,773 105,686 337,087 430,501 108,689 321,812 371,633 90,393 281,240 Washington D.C. 434,545 134,427 300,118 430,060 129,720 300,340 424,350 126,154 298,196 New York 458,366 181,040 277,326 454,945 170,064 284,881 456,664 159,302 297,362 Boston 229,079 63,348 165,731 223,595 60,931 162,664 225,014 62,650 162,364 Seattle 196,479 55,165 141,314 191,074 52,470 138,604 168,975 46,255 122,720 Other Markets 1,940 657 1,283 1,839 652 1,187 1,797 567 1,230 Total same store 2,363,491 705,890 1,657,601 2,311,240 681,198 1,630,042 2,200,094 639,342 1,560,752 Non-same store/other (2) (3) Non-same store 190,814 63,907 126,907 95,016 30,742 64,274 117,143 41,877 75,266 Other (3) 23,376 17,352 6,024 64,433 28,836 35,597 104,996 42,991 62,005 Total non-same store/other 214,190 81,259 132,931 159,449 59,578 99,871 222,139 84,868 137,271 Totals $ 2,577,681 $ 787,149 $ 1,790,532 $ 2,470,689 $ 740,776 $ 1,729,913 $ 2,422,233 $ 724,210 $ 1,698,023 (1) For the years ended December 31, 2018 and 2017, same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2017, less properties subsequently sold, which represented 71,721 apartment units. For the year ended December 31, 2016, same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2016, less properties subsequently sold, which represented 70,117 apartment units. (2) For the years ended December 31, 2018 and 2017, non-same store primarily includes properties acquired after January 1, 2017, plus any properties in lease-up and not stabilized as of January 1, 2017. For the year ended December 31, 2016, non-same store primarily includes properties acquired after January 1, 2016, plus any properties in lease-up and not stabilized as of January 1, 2016. (3) Other includes development, other corporate operations and operations prior to disposition for properties sold. Year Ended December 31, 2018 Year Ended December 31, 2017 Total Assets Capital Expenditures Total Assets Capital Expenditures Same store (1) Los Angeles $ 2,608,347 $ 28,306 $ 2,692,602 $ 26,921 Orange County 318,472 8,192 328,593 9,237 San Diego 405,449 4,525 421,267 4,922 Subtotal - Southern California 3,332,268 41,023 3,442,462 41,080 San Francisco 2,967,735 44,837 3,039,552 38,618 Washington D.C. 3,702,368 29,616 3,803,185 35,423 New York 4,063,568 23,472 4,160,603 30,403 Boston 1,589,000 24,623 1,636,925 28,687 Seattle 1,277,865 17,825 1,316,678 21,646 Other Markets 12,781 163 12,768 103 Total same store 16,945,585 181,559 17,412,173 195,960 Non-same store/other (2) (3) Non-same store 2,940,770 6,665 2,276,312 3,704 Other (3) 507,854 277 882,114 2,943 Total non-same store/other 3,448,624 6,942 3,158,426 6,647 Totals $ 20,394,209 $ 188,501 $ 20,570,599 $ 202,607 (1) Same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2017, less properties subsequently sold, which represented 71,721 apartment units. (2) Non-same store primarily includes properties acquired after January 1, 2017, plus any properties in lease-up and not stabilized as of January 1, 2017. (3) Other includes development, other corporate operations and capital expenditures for properties sold.

Subsequent Events_Other

Subsequent Events/Other	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events/Other	18. Subsequent Events/Other Subsequent Events Subsequent to December 31, 2018, the Company: • Acquired three properties consisting of 579 apartment units for approximately $258.7 million; and • Obtained $288.1 million in 3.94% fixed rate mortgage debt held in a Fannie Mae loan pool maturing on March 1, 2029. Other During the year ended December 31, 2016, the Company sold its entire interest in the management contracts and related rights associated with the military housing ventures at Joint Base Lewis McChord consisting of 5,161 apartment units for approximately $63.3 million and recognized a gain on sale of approximately $52.4 million, which is included in interest and other income in the accompanying consolidated statements of operations and comprehensive income.

Quarterly Financial Data (Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Data [Abstract]
Quarterly Financial Data (Unaudited)	19. Quarterly Financial Data (Unaudited) Equity Residential The following unaudited quarterly data has been prepared on the basis of a December 31 year-end. Amounts are in thousands, except for per share amounts. First Quarter Second Quarter Third Quarter Fourth Quarter 2018 3/31 6/30 9/30 12/31 Total revenues $ 633,016 $ 639,808 $ 652,867 $ 652,743 Operating income 196,869 217,654 224,731 219,306 Net income * 220,548 118,410 223,846 122,388 Net income available to Common Shares 211,036 112,830 214,164 116,415 Earnings per share – basic: Net income available to Common Shares $ 0.57 $ 0.31 $ 0.58 $ 0.32 Weighted average Common Shares outstanding 367,800 367,930 368,028 368,445 Earnings per share – diluted: Net income available to Common Shares $ 0.57 $ 0.31 $ 0.58 $ 0.31 Weighted average Common Shares outstanding 383,018 383,423 383,884 384,296 First Quarter Second Quarter Third Quarter Fourth Quarter 2017 3/31 6/30 9/30 12/31 Total revenues $ 604,100 $ 612,480 $ 624,122 $ 630,704 Operating income 204,371 210,550 217,786 214,764 Net income * 149,941 204,160 144,196 130,084 Net income available to Common Shares 142,969 195,268 137,457 124,669 Earnings per share – basic: Net income available to Common Shares $ 0.39 $ 0.53 $ 0.37 $ 0.34 Weighted average Common Shares outstanding 366,605 366,820 366,996 367,442 Earnings per share – diluted: Net income available to Common Shares $ 0.39 $ 0.53 $ 0.37 $ 0.34 Weighted average Common Shares outstanding 382,280 382,692 382,945 383,105 * The Company did not have any discontinued operations, extraordinary items or cumulative effect of change in accounting principle during the years ended December 31, 2018 and 2017. Therefore, income from continuing operations and income before extraordinary items and cumulative effect of change in accounting principle are not shown as they were both equal to the net income amounts disclosed above. ERP Operating Limited Partnership The following unaudited quarterly data has been prepared on the basis of a December 31 year-end. Amounts are in thousands, except for per Unit amounts. First Quarter Second Quarter Third Quarter Fourth Quarter 2018 3/31 6/30 9/30 12/31 Total revenues $ 633,016 $ 639,808 $ 652,867 $ 652,743 Operating income 196,869 217,654 224,731 219,306 Net income * 220,548 118,410 223,846 122,388 Net income available to Units 219,095 117,129 222,323 120,837 Earnings per Unit – basic: Net income available to Units $ 0.57 $ 0.31 $ 0.58 $ 0.32 Weighted average Units outstanding 380,663 380,795 380,912 381,306 Earnings per Unit – diluted: Net income available to Units $ 0.57 $ 0.31 $ 0.58 $ 0.31 Weighted average Units outstanding 383,018 383,423 383,884 384,296 First Quarter Second Quarter Third Quarter Fourth Quarter 2017 3/31 6/30 9/30 12/31 Total revenues $ 604,100 $ 612,480 $ 624,122 $ 630,704 Operating income 204,371 210,550 217,786 214,764 Net income * 149,941 204,160 144,196 130,084 Net income available to Units 148,380 202,622 142,623 129,342 Earnings per Unit – basic: Net income available to Units $ 0.39 $ 0.53 $ 0.37 $ 0.34 Weighted average Units outstanding 379,504 379,733 379,906 380,325 Earnings per Unit – diluted: Net income available to Units $ 0.39 $ 0.53 $ 0.37 $ 0.34 Weighted average Units outstanding 382,280 382,692 382,945 383,105 * The Operating Partnership did not have any discontinued operations, extraordinary items or cumulative effect of change in accounting principle during the years ended December 31, 2018 and 2017. Therefore, income from continuing operations and income before extraordinary items and cumulative effect of change in accounting principle are not shown as they were both equal to the net income amounts disclosed above.

Schedule III - Real Estate and

Schedule III - Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2018
Real Estate And Accumulated Depreciation Disclosure [Abstract]
Schedule III-Real Estate and Accumulated Depreciation	EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Overall Summary December 31, 2018 Properties (H) Apartment Units (H) Investment in Real Estate, Gross Accumulated Depreciation Investment in Real Estate, Net Encumbrances (1) Wholly Owned Unencumbered 240 62,862 $ 21,609,130,732 $ (5,400,484,879 ) $ 16,208,645,853 $ — Wholly Owned Encumbered 48 12,140 4,023,117,169 (1,039,436,780 ) 2,983,680,389 2,081,887,149 Wholly Owned Properties 288 75,002 25,632,247,901 (6,439,921,659 ) 19,192,326,242 2,081,887,149 Partially Owned Unencumbered 9 1,847 516,719,235 (116,736,579 ) 399,982,656 — Partially Owned Encumbered 8 1,688 362,054,538 (139,622,501 ) 222,432,037 303,583,335 Partially Owned Properties 17 3,535 878,773,773 (256,359,080 ) 622,414,693 303,583,335 Total Unencumbered Properties 249 64,709 22,125,849,967 (5,517,221,458 ) 16,608,628,509 — Total Encumbered Properties 56 13,828 4,385,171,707 (1,179,059,281 ) 3,206,112,426 2,385,470,484 Total Consolidated Investment in Real Estate 305 78,537 $ 26,511,021,674 $ (6,696,280,739 ) $ 19,814,740,935 $ 2,385,470,484 (1) See attached Encumbrances Reconciliation. EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation Encumbrances Reconciliation December 31, 2018 Portfolio/Entity Encumbrances Number of Properties Encumbered by See Properties With Note: Amount Archstone Master Property Holdings LLC 13 I $ 797,768,476 Portfolio/Entity Encumbrances 13 797,768,476 Individual Property Encumbrances 1,587,702,008 Total Encumbrances per Financial Statements $ 2,385,470,484 EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III – Real Estate and Accumulated Depreciation (Amounts in thousands) The changes in total real estate for the years ended December 31, 2018, 2017 and 2016 are as follows: 2018 2017 2016 Balance, beginning of year $ 26,026,896 $ 25,386,425 $ 28,542,697 Acquisitions and development 855,254 710,960 832,803 Improvements 192,661 204,113 174,981 Dispositions and other (563,789 ) (274,602 ) (4,164,056 ) Balance, end of year $ 26,511,022 $ 26,026,896 $ 25,386,425 The changes in accumulated depreciation for the years ended December 31, 2018, 2017 and 2016 are as follows: 2018 2017 2016 Balance, beginning of year $ 6,040,378 $ 5,360,389 $ 6,084,616 Depreciation 785,725 743,749 705,649 Dispositions and other (129,822 ) (63,760 ) (1,429,876 ) Balance, end of year $ 6,696,281 $ 6,040,378 $ 5,360,389 EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation December 31, 2018 Description Initial Cost to Company Cost Capitalized Subsequent to Acquisition (Improvements, net) (E) Gross Amount Carried at Close of Period 12/31/18 Apartment Name Location Retail/ Commercial Space Date of Construction Apartment Units (H) Land Building & Fixtures Building & Fixtures Land Building & Fixtures (A) Total (B) Accumulated Depreciation (C) Investment in Real Estate, Net at 12/31/18 Encumbrances Wholly Owned Unencumbered: 100 K Apartments (fka 100K Street) Washington, D.C. — 2018 222 $ 15,600,000 $ 69,516,265 $ — $ 15,600,000 $ 69,516,265 $ 85,116,265 $ (270,039 ) $ 84,846,226 $ — 140 Riverside Boulevard New York, NY G 2003 354 103,539,100 94,082,725 9,479,410 103,539,100 103,562,135 207,101,235 (48,691,122 ) 158,410,113 — 160 Riverside Boulevard New York, NY G 2001 455 139,933,500 190,964,745 15,656,370 139,933,500 206,621,115 346,554,615 (96,815,700 ) 249,738,915 — 170 Amsterdam New York, NY G 2015 236 — 112,096,955 235,580 — 112,332,535 112,332,535 (16,016,094 ) 96,316,441 — 175 Kent Brooklyn, NY G 2011 113 22,037,831 53,962,169 1,701,936 22,037,831 55,664,105 77,701,936 (16,317,361 ) 61,384,575 — 180 Montague (fka Brooklyn Heights) Brooklyn, NY G 2000 193 32,400,000 92,675,228 3,859,381 32,400,000 96,534,609 128,934,609 (23,584,176 ) 105,350,433 — 180 Riverside Boulevard New York, NY G 1998 516 144,968,250 138,346,681 13,831,031 144,968,250 152,177,712 297,145,962 (72,790,895 ) 224,355,067 — 1111 Belle Pre (fka The Madison) Alexandria, VA G 2014 360 18,937,702 94,758,679 278,928 18,937,702 95,037,607 113,975,309 (22,340,533 ) 91,634,776 — 1210 Mass Washington, D.C. G 2004 144 9,213,512 36,559,189 2,537,398 9,213,512 39,096,587 48,310,099 (18,478,163 ) 29,831,936 — 1401 E. Madison Seattle, WA G (F) — 10,401,958 24,121,307 — 10,401,958 24,121,307 34,523,265 — 34,523,265 — 1500 Mass Ave Washington, D.C. G 1951 556 54,638,298 40,361,702 15,209,807 54,638,298 55,571,509 110,209,807 (26,934,077 ) 83,275,730 — 1800 Oak (fka Rosslyn) Arlington, VA G 2003 314 31,400,000 109,005,734 6,217,218 31,400,000 115,222,952 146,622,952 (28,057,310 ) 118,565,642 — 2201 Pershing Drive Arlington, VA G 2012 188 11,321,198 49,674,175 2,567,690 11,321,198 52,241,865 63,563,063 (13,457,087 ) 50,105,976 — 2201 Wilson Arlington, VA G 2000 219 21,900,000 78,724,663 3,697,727 21,900,000 82,422,390 104,322,390 (20,152,746 ) 84,169,644 — 2400 M St Washington, D.C. G 2006 359 30,006,593 114,013,785 4,562,289 30,006,593 118,576,074 148,582,667 (53,570,540 ) 95,012,127 — 249 Third Street (fka Kendall Square II) Cambridge, MA G (F) — 4,603,326 21,564,301 — 4,603,326 21,564,301 26,167,627 — 26,167,627 — 315 on A Boston, MA G 2013 202 14,450,070 115,824,930 766,896 14,450,070 116,591,826 131,041,896 (18,672,172 ) 112,369,724 — 340 Fremont (fka Rincon Hill) San Francisco, CA — 2016 348 42,000,000 247,811,082 92,829 42,000,000 247,903,911 289,903,911 (23,751,926 ) 266,151,985 — 3003 Van Ness (fka Van Ness) Washington, D.C. — 1970 625 56,300,000 141,191,580 6,576,256 56,300,000 147,767,836 204,067,836 (38,475,875 ) 165,591,961 — 45 Worthington (CityView II) Boston, MA — (F) — — 2,644,777 — — 2,644,777 2,644,777 — 2,644,777 — 425 Mass Washington, D.C. G 2009 559 28,150,000 138,600,000 4,379,551 28,150,000 142,979,551 171,129,551 (48,799,382 ) 122,330,169 — 455 Eye Street Washington, D.C. G 2017 174 11,941,406 61,395,797 20,856 11,941,406 61,416,653 73,358,059 (3,530,514 ) 69,827,545 — 4701 Willard Chevy Chase, MD G 1966 517 76,921,130 153,947,682 30,602,147 76,921,130 184,549,829 261,470,959 (58,855,681 ) 202,615,278 — 4885 Edgemoor Lane Bethesda, MD — (F) — — 3,766,336 — — 3,766,336 3,766,336 — 3,766,336 — 4th and Hill Los Angeles, CA — (F) — 13,131,456 14,133,106 — 13,131,456 14,133,106 27,264,562 — 27,264,562 — 600 Washington New York, NY G 2004 135 32,852,000 43,140,551 1,100,410 32,852,000 44,240,961 77,092,961 (20,829,342 ) 56,263,619 — 660 Washington (fka Boston Common) Boston, MA G 2006 420 106,100,000 166,311,679 3,523,700 106,100,000 169,835,379 275,935,379 (41,138,920 ) 234,796,459 — 70 Greene Jersey City, NJ G 2010 480 28,108,899 236,763,553 2,269,833 28,108,899 239,033,386 267,142,285 (73,802,320 ) 193,339,965 — 71 Broadway New York, NY G 1997 238 22,611,600 77,492,171 15,001,275 22,611,600 92,493,446 115,105,046 (47,229,499 ) 67,875,547 — 77 Bluxome San Francisco, CA — 2007 102 5,249,124 18,609,876 443,622 5,249,124 19,053,498 24,302,622 (5,793,095 ) 18,509,527 — 77 Park Avenue (fka Hoboken) Hoboken, NJ G 2000 301 27,900,000 168,992,440 6,604,709 27,900,000 175,597,149 203,497,149 (41,358,995 ) 162,138,154 — 777 Sixth New York, NY G 2002 294 65,352,706 65,747,294 4,014,061 65,352,706 69,761,355 135,114,061 (28,362,079 ) 106,751,982 — 88 Hillside Daly City, CA G 2011 95 7,786,800 31,587,325 3,069,561 7,786,800 34,656,886 42,443,686 (10,033,292 ) 32,410,394 — 855 Brannan San Francisco, CA G 2018 449 41,363,921 280,655,909 32,065 41,363,921 280,687,974 322,051,895 (12,233,138 ) 309,818,757 — Acappella Pasadena, CA — 2002 143 5,839,548 29,360,452 2,165,266 5,839,548 31,525,718 37,365,266 (11,163,153 ) 26,202,113 — Acton Courtyard Berkeley, CA G 2003 71 5,550,000 15,785,509 303,373 5,550,000 16,088,882 21,638,882 (7,089,343 ) 14,549,539 — Alban Towers Washington, D.C. — 1934 229 18,900,000 89,794,201 4,895,344 18,900,000 94,689,545 113,589,545 (22,245,031 ) 91,344,514 — Alborada Fremont, CA — 1999 442 24,310,000 59,214,129 9,293,818 24,310,000 68,507,947 92,817,947 (41,761,182 ) 51,056,765 — Altitude (fka Village at Howard Hughes, The (Lots 1 & 2)) Los Angeles, CA — 2016 545 43,783,485 148,378,972 123,006 43,783,485 148,501,978 192,285,463 (14,509,419 ) 177,776,044 — Alton, The (fka Millikan) Irvine, CA — 2017 344 11,049,027 95,898,795 27,038 11,049,027 95,925,833 106,974,860 (7,393,177 ) 99,581,683 — Arbor Terrace Sunnyvale, CA — 1979 175 9,057,300 18,483,642 9,866,646 9,057,300 28,350,288 37,407,588 (16,398,864 ) 21,008,724 — Arches, The Sunnyvale, CA — 1974 410 26,650,000 62,850,000 2,142,608 26,650,000 64,992,608 91,642,608 (22,783,366 ) 68,859,242 — Artech Building Berkeley, CA G 2002 27 1,642,000 9,152,518 2,118,504 1,642,000 11,271,022 12,913,022 (4,123,265 ) 8,789,757 — Artisan on Second Los Angeles, CA — 2008 118 8,000,400 36,074,600 1,046,371 8,000,400 37,120,971 45,121,371 (11,684,515 ) 33,436,856 — Artistry Emeryville (fka Emeryville) Emeryville, CA — 1994 267 12,300,000 61,466,267 6,802,555 12,300,000 68,268,822 80,568,822 (17,833,191 ) 62,735,631 — Atelier Brooklyn, NY G 2015 120 32,401,680 47,135,432 313,737 32,401,680 47,449,169 79,850,849 (6,648,014 ) 73,202,835 — EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation December 31, 2018 Description Initial Cost to Company Cost Capitalized Subsequent to Acquisition (Improvements, net) (E) Gross Amount Carried at Close of Period 12/31/18 Apartment Name Location Retail/ Commercial Space Date of Construction Apartment Units (H) Land Building & Fixtures Building & Fixtures Land Building & Fixtures (A) Total (B) Accumulated Depreciation (C) Investment in Real Estate, Net at 12/31/18 Encumbrances Avanti Anaheim, CA — 1987 162 12,960,000 18,497,683 3,876,996 12,960,000 22,374,679 35,334,679 (10,360,476 ) 24,974,203 — Avenue Two Redwood City, CA — 1972 123 7,995,000 18,005,000 2,385,284 7,995,000 20,390,284 28,385,284 (6,758,825 ) 21,626,459 — Azure (fka Mission Bay-Block 13) San Francisco, CA — 2015 273 32,855,115 152,628,044 201,962 32,855,115 152,830,006 185,685,121 (19,304,541 ) 166,380,580 — Bay Hill Long Beach, CA — 2002 160 7,600,000 27,437,239 3,501,456 7,600,000 30,938,695 38,538,695 (15,493,308 ) 23,045,387 — Beatrice, The New York, NY — 2010 302 114,351,405 165,648,595 1,583,190 114,351,405 167,231,785 281,583,190 (46,223,187 ) 235,360,003 — Belle Arts Condominium Homes, LLC Bellevue, WA — 2000 1 63,158 236,157 2,098 63,158 238,255 301,413 (83,348 ) 218,065 — Belle Fontaine Marina Del Rey, CA — 2003 102 9,098,808 28,701,192 1,277,604 9,098,808 29,978,796 39,077,604 (8,865,592 ) 30,212,012 — Breakwater at Marina Del Rey Marina Del Rey, CA — 1964-1969 224 — 73,189,262 2,103,728 — 75,292,990 75,292,990 (19,870,053 ) 55,422,937 — Briarwood (CA) Sunnyvale, CA — 1985 192 9,991,500 22,247,278 4,121,529 9,991,500 26,368,807 36,360,307 (17,956,685 ) 18,403,622 — Bridford Lakes II Greensboro, NC — (F) — 200,000 — — 200,000 — 200,000 — 200,000 — Brooklyner, The (fka 111 Lawrence) Brooklyn, NY G 2010 490 40,099,922 221,438,631 3,760,049 40,099,922 225,198,680 265,298,602 (61,813,037 ) 203,485,565 — C on Pico Los Angeles, CA — 2014 94 17,125,766 28,074,234 192,535 17,125,766 28,266,769 45,392,535 (3,822,366 ) 41,570,169 — Carlyle Mill Alexandria, VA — 2002 317 10,000,000 51,367,913 8,584,023 10,000,000 59,951,936 69,951,936 (32,763,420 ) 37,188,516 — Carmel Terrace San Diego, CA — 1988-1989 384 2,288,300 20,596,281 12,173,035 2,288,300 32,769,316 35,057,616 (27,594,760 ) 7,462,856 — Cascade Seattle, WA G 2017 477 23,751,564 148,150,309 1,109 23,751,564 148,151,418 171,902,982 (8,307,229 ) 163,595,753 — Centennial (fka Centennial Court & Centennial Tower) Seattle, WA G 1991/2001 408 9,700,000 70,080,378 12,240,924 9,700,000 82,321,302 92,021,302 (40,391,210 ) 51,630,092 — Centre Club Combined Ontario, CA — 1994 & 2002 412 7,436,000 33,014,789 9,207,501 7,436,000 42,222,290 49,658,290 (24,948,636 ) 24,709,654 — Chloe Seattle, WA G 2010 117 14,835,571 39,359,650 628,879 14,835,571 39,988,529 54,824,100 (2,779,352 ) 52,044,748 — Church Corner Cambridge, MA G 1987 85 5,220,000 16,744,643 3,104,358 5,220,000 19,849,001 25,069,001 (10,167,185 ) 14,901,816 — City Gate at Cupertino (fka Cupertino) Cupertino, CA — 1998 311 40,400,000 95,937,046 7,410,552 40,400,000 103,347,598 143,747,598 (25,436,921 ) 118,310,677 — City Pointe Fullerton, CA G 2004 183 6,863,792 36,476,208 2,047,704 6,863,792 38,523,912 45,387,704 (14,150,420 ) 31,237,284 — City Square Bellevue (fka Bellevue) Bellevue, WA G 1998 191 15,100,000 41,876,257 3,476,525 15,100,000 45,352,782 60,452,782 (11,624,754 ) 48,828,028 — CityView at Longwood Boston, MA G 1970 295 14,704,898 79,195,102 13,594,830 14,704,898 92,789,932 107,494,830 (33,266,169 ) 74,228,661 — Clarendon, The Arlington, VA G 2005 292 30,400,340 103,824,660 2,390,107 30,400,340 106,214,767 136,615,107 (33,551,922 ) 103,063,185 — Cleo, The Los Angeles, CA — 1989 92 6,615,467 14,829,335 3,945,639 6,615,467 18,774,974 25,390,441 (9,223,334 ) 16,167,107 — Connecticut Heights Washington, D.C. — 1974 518 27,600,000 114,002,295 9,236,604 27,600,000 123,238,899 150,838,899 (29,100,080 ) 121,738,819 — Corcoran House at DuPont Circle (fka DuPont Circle) Washington, D.C. G 1961 138 13,500,000 26,913,113 1,945,268 13,500,000 28,858,381 42,358,381 (7,970,206 ) 34,388,175 — Courthouse Plaza Arlington, VA G 1990 396 — 87,386,024 5,810,948 — 93,196,972 93,196,972 (25,008,039 ) 68,188,933 — Creekside (San Mateo) San Mateo, CA — 1985 192 9,606,600 21,193,231 4,714,294 9,606,600 25,907,525 35,514,125 (17,827,109 ) 17,687,016 — Cronins Landing Waltham, MA G 1998 281 32,300,000 85,119,324 9,986,941 32,300,000 95,106,265 127,406,265 (23,112,933 ) 104,293,332 — Crystal Place Arlington, VA — 1986 181 17,200,000 47,918,975 3,799,780 17,200,000 51,718,755 68,918,755 (13,497,731 ) 55,421,024 — Deerwood (SD) San Diego, CA — 1990 316 2,082,095 18,739,815 15,328,542 2,082,095 34,068,357 36,150,452 (29,457,997 ) 6,692,455 — Del Mar Ridge San Diego, CA — 1998 181 7,801,824 36,948,176 3,997,663 7,801,824 40,945,839 48,747,663 (16,173,191 ) 32,574,472 — Eagle Canyon Chino Hills, CA — 1985 252 1,808,900 16,274,361 10,216,962 1,808,900 26,491,323 28,300,223 (19,595,575 ) 8,704,648 — Edgemont at Bethesda Metro Bethesda, MD — 1989 122 13,092,552 43,907,448 1,570,420 13,092,552 45,477,868 58,570,420 (13,558,521 ) 45,011,899 — Elevé Glendale, CA G 2013 208 14,080,560 56,419,440 741,173 14,080,560 57,160,613 71,241,173 (12,317,955 ) 58,923,218 — Emerson Place Boston, MA G 1962 444 14,855,000 57,566,636 31,456,250 14,855,000 89,022,886 103,877,886 (59,097,457 ) 44,780,429 — Encore at Sherman Oaks, The Sherman Oaks, CA — 1988 174 8,700,000 25,446,003 2,240,556 8,700,000 27,686,559 36,386,559 (9,771,700 ) 26,614,859 — Fountains at Emerald Park (fka Emerald Park) Dublin, CA — 2000 324 25,900,000 83,986,217 2,547,788 25,900,000 86,534,005 112,434,005 (22,068,994 ) 90,365,011 — Fremont Center Fremont, CA G 2002 322 25,800,000 78,753,114 4,235,681 25,800,000 82,988,795 108,788,795 (21,299,475 ) 87,489,320 — Gallery, The Hermosa Beach, CA — 1971 169 18,144,000 46,567,941 2,905,707 18,144,000 49,473,648 67,617,648 (23,145,881 ) 44,471,767 — Gateway at Malden Center Malden, MA G 1988 203 9,209,780 25,722,666 15,394,618 9,209,780 41,117,284 50,327,064 (24,990,335 ) 25,336,729 — Geary Court Yard San Francisco, CA — 1990 164 1,722,400 15,471,429 5,447,819 1,722,400 20,919,248 22,641,648 (14,374,505 ) 8,267,143 — Girard Boston, MA G 2016 160 — 102,450,328 792,675 — 103,243,003 103,243,003 (7,551,227 ) 95,691,776 — Hampshire Place Los Angeles, CA — 1989 259 10,806,000 30,335,330 6,750,493 10,806,000 37,085,823 47,891,823 (18,306,144 ) 29,585,679 — Harbor Steps Seattle, WA G 2000 758 59,403,601 158,829,432 35,187,525 59,403,601 194,016,957 253,420,558 (88,466,202 ) 164,954,356 — Heights on Capitol Hill Seattle, WA G 2006 104 5,425,000 21,138,028 1,757,739 5,425,000 22,895,767 28,320,767 (9,916,225 ) 18,404,542 — Helios (fka 2nd+Pine) Seattle, WA G 2017 398 18,061,674 206,297,144 14,831 18,061,674 206,311,975 224,373,649 (11,942,676 ) 212,430,973 — EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation December 31, 2018 Description Initial Cost to Company Cost Capitalized Subsequent to Acquisition (Improvements, net) (E) Gross Amount Carried at Close of Period 12/31/18 Apartment Name Location Retail/ Commercial Space Date of Construction Apartment Units (H) Land Building & Fixtures Building & Fixtures Land Building & Fixtures (A) Total (B) Accumulated Depreciation (C) Investment in Real Estate, Net at 12/31/18 Encumbrances Heritage at Stone Ridge Burlington, MA — 2005 180 10,800,000 31,808,335 2,560,256 10,800,000 34,368,591 45,168,591 (16,558,111 ) 28,610,480 — Heritage Ridge Lynwood, WA — 1999 197 6,895,000 18,983,597 4,341,551 6,895,000 23,325,148 30,220,148 (10,981,639 ) 19,238,509 — Hesby North Hollywood, CA — 2013 308 23,299,892 102,700,108 1,045,443 23,299,892 103,745,551 127,045,443 (21,321,630 ) 105,723,813 — Highlands at South Plainfield South Plainfield, NJ — 2000 252 10,080,000 37,526,912 2,174,172 10,080,000 39,701,084 49,781,084 (18,721,344 ) 31,059,740 — Hikari Los Angeles, CA G 2007 128 9,435,760 32,564,240 924,031 9,435,760 33,488,271 42,924,031 (10,500,837 ) 32,423,194 — Hudson Crossing New York, NY G 2003 259 23,420,000 69,977,699 2,641,742 23,420,000 72,619,441 96,039,441 (35,972,698 ) 60,066,743 — Hudson Pointe Jersey City, NJ — 2003 182 5,350,000 41,114,074 6,559,255 5,350,000 47,673,329 53,023,329 (24,093,676 ) 28,929,653 — Hunt Club II Charlotte, NC — (F) — 100,000 — — 100,000 — 100,000 — 100,000 — Ivory Wood Bothell, WA — 2000 144 2,732,800 13,888,282 1,470,190 2,732,800 15,358,472 18,091,272 (7,954,981 ) 10,136,291 — Jia (fka Chinatown Gateway) Los Angeles, CA G 2014 280 14,791,831 77,708,868 400,967 14,791,831 78,109,835 92,901,666 (19,685,769 ) 73,215,897 — Junction 47 (fka West Seattle) Seattle, WA G 2015 206 11,726,305 56,246,557 110,852 11,726,305 56,357,409 68,083,714 (7,480,950 ) 60,602,764 — Kelvin, The (fka Modera) Irvine, CA — 2015 194 15,521,552 64,853,448 520,485 15,521,552 65,373,933 80,895,485 (10,153,159 ) 70,742,326 — Kenwood Mews Burbank, CA — 1991 141 14,100,000 24,662,883 4,006,944 14,100,000 28,669,827 42,769,827 (13,857,402 ) 28,912,425 — Laguna Clara Santa Clara, CA — 1972 264 13,642,420 28,128,260 5,050,290 13,642,420 33,178,550 46,820,970 (18,704,128 ) 28,116,842 — Landings at Port Imperial W. New York, NJ — 1999 276 27,246,045 37,741,050 12,850,243 27,246,045 50,591,293 77,837,338 (31,145,964 ) 46,691,374 — Liberty Tower Arlington, VA G 2008 235 16,382,822 83,817,078 2,105,715 16,382,822 85,922,793 102,305,615 (28,986,710 ) 73,318,905 — Lincoln Heights Quincy, MA — 1991 336 5,928,400 33,595,262 14,626,711 5,928,400 48,221,973 54,150,373 (36,031,322 ) 18,119,051 — Lindley Apartments Encino, CA — 2004 129 5,805,000 25,705,000 1,577,513 5,805,000 27,282,513 33,087,513 (9,306,827 ) 23,780,686 — Lofts 590 Arlington, VA — 2005 212 20,100,000 67,909,023 732,963 20,100,000 68,641,986 88,741,986 (16,094,383 ) 72,647,603 — Lofts at Kendall Square (fka Kendall Square) Cambridge, MA — 1998 186 18,696,674 78,445,657 6,554,452 18,696,674 85,000,109 103,696,783 (20,874,720 ) 82,822,063 — Longacre House New York, NY G 2000 293 73,170,045 53,962,510 3,845,833 73,170,045 57,808,343 130,978,388 (24,364,056 ) 106,614,332 — Longfellow Place Boston, MA G 1975 710 38,264,917 132,175,915 82,037,087 38,264,917 214,213,002 252,477,919 (143,886,095 ) 108,591,824 — Longview Place Waltham, MA — 2004 348 20,880,000 90,255,509 7,188,625 20,880,000 97,444,134 118,324,134 (45,368,039 ) 72,956,095 — Mantena New York, NY G 2012 98 22,346,513 61,501,158 942,456 22,346,513 62,443,614 84,790,127 (15,923,495 ) 68,866,632 — Marina 41 (fka Marina Del Rey) Marina Del Rey, CA — 1973 623 — 168,842,442 8,397,509 — 177,239,951 177,239,951 (47,146,998 ) 130,092,953 — Mariposa at Playa Del Rey (fka Playa Del Rey) Playa Del Rey, CA — 2004 354 60,900,000 89,311,482 5,580,206 60,900,000 94,891,688 155,791,688 (24,699,526 ) 131,092,162 — Market Street Village San Diego, CA — 2006 229 13,740,000 40,757,301 2,328,664 13,740,000 43,085,965 56,825,965 (19,556,103 ) 37,269,862 — Metro on First Seattle, WA G 2002 102 8,540,000 12,209,981 2,362,369 8,540,000 14,572,350 23,112,350 (6,573,840 ) 16,538,510 — Milano Lofts Los Angeles, CA G 1925/2006 99 8,125,216 27,378,784 2,883,991 8,125,216 30,262,775 38,387,991 (8,050,414 ) 30,337,577 — Montierra (CA) San Diego, CA — 1990 272 8,160,000 29,360,938 8,205,107 8,160,000 37,566,045 45,726,045 (25,291,041 ) 20,435,004 — Mosaic at Metro Hyattsville, MD — 2008 260 — 59,580,898 1,270,920 — 60,851,818 60,851,818 (21,513,518 ) 39,338,300 — Mountain View Redevelopment Mountain View, CA — (F) — — 160,996 — — 160,996 160,996 — 160,996 — Mozaic at Union Station Los Angeles, CA — 2007 272 8,500,000 52,529,446 2,384,578 8,500,000 54,914,024 63,414,024 (24,082,672 ) 39,331,352 — Murray Hill Tower (fka Murray Hill) New York, NY G 1974 270 75,800,000 102,705,401 9,551,107 75,800,000 112,256,508 188,056,508 (30,064,769 ) 157,991,739 — North Pier at Harborside Jersey City, NJ — 2003 297 4,000,159 94,290,590 4,743,836 4,000,159 99,034,426 103,034,585 (49,673,731 ) 53,360,854 — Northglen Valencia, CA — 1988 234 9,360,000 20,778,553 5,764,419 9,360,000 26,542,972 35,902,972 (15,274,806 ) 20,628,166 — Northpark Burlingame, CA — 1972 510 38,607,000 77,472,217 14,751,585 38,607,000 92,223,802 130,830,802 (36,348,320 ) 94,482,482 — Northridge Pleasant Hill, CA — 1974 221 5,524,000 14,691,705 11,428,402 5,524,000 26,120,107 31,644,107 (19,830,954 ) 11,813,153 — Oak Park Combined Agoura Hills, CA — 1989 & 1990 444 3,390,700 30,517,274 10,707,930 3,390,700 41,225,204 44,615,904 (31,925,485 ) 12,690,419 — Oaks Santa Clarita, CA — 2000 520 23,400,000 61,020,438 6,184,215 23,400,000 67,204,653 90,604,653 (36,500,570 ) 54,104,083 — Oakwood Crystal City Arlington, VA — 1987 162 15,400,000 35,474,336 4,071,719 15,400,000 39,546,055 54,946,055 (10,060,766 ) 44,885,289 — Ocean Crest Solana Beach, CA — 1986 146 5,111,200 11,910,438 4,523,128 5,111,200 16,433,566 21,544,766 (11,149,744 ) 10,395,022 — Odin (fka Tallman) Seattle, WA — 2015 301 16,807,519 63,651,394 43,186 16,807,519 63,694,580 80,502,099 (8,420,800 ) 72,081,299 — Old Town Lofts Redmond, WA G 2014 149 7,740,467 44,146,181 802,966 7,740,467 44,949,147 52,689,614 (6,895,004 ) 45,794,610 — One Henry Adams San Francisco, CA G 2016 241 30,224,393 138,212,568 10,366 30,224,393 138,222,934 168,447,327 (10,939,933 ) 157,507,394 — One India Street (fka Oakwood Boston) Boston, MA G 1901 94 22,200,000 28,672,979 3,346,235 22,200,000 32,019,214 54,219,214 (8,203,480 ) 46,015,734 — Pacific Place Los Angeles, CA — 2008 430 32,250,000 110,750,000 1,796,632 32,250,000 112,546,632 144,796,632 (27,949,911 ) 116,846,721 — EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation December 31, 2018 Description Initial Cost to Company Cost Capitalized Subsequent to Acquisition (Improvements, net) (E) Gross Amount Carried at Close of Period 12/31/18 Apartment Name Location Retail/ Commercial Space Date of Construction Apartment Units (H) Land Building & Fixtures Building & Fixtures Land Building & Fixtures (A) Total (B) Accumulated Depreciation (C) Investment in Real Estate, Net at 12/31/18 Encumbrances Packard Building Seattle, WA G 2010 61 5,911,041 19,954,959 691,363 5,911,041 20,646,322 26,557,363 (3,017,526 ) 23,539,837 — Parc 77 New York, NY G 1903 137 40,504,000 18,025,679 6,345,232 40,504,000 24,370,911 64,874,911 (13,224,242 ) 51,650,669 — Parc Cameron New York, NY G 1927 166 37,600,000 9,855,597 7,488,875 37,600,000 17,344,472 54,944,472 (11,104,877 ) 43,839,595 — Parc Coliseum New York, NY G 1910 177 52,654,000 23,045,751 9,179,112 52,654,000 32,224,863 84,878,863 (18,199,716 ) 66,679,147 — Parc East Towers New York, NY G 1977 324 102,163,000 108,989,402 10,892,394 102,163,000 119,881,796 222,044,796 (52,426,236 ) 169,618,560 — Parc on Powell (fka Parkside at Emeryville) Emeryville, CA G 2015 173 16,667,059 65,073,509 212,580 16,667,059 65,286,089 81,953,148 (9,333,810 ) 72,619,338 — Park at Pentagon Row (fka Pentagon City) Arlington, VA G 1990 298 28,300,000 78,838,184 2,436,695 28,300,000 81,274,879 109,574,879 (20,074,236 ) 89,500,643 — Park Connecticut Washington, D.C. — 2000 142 13,700,000 59,087,519 1,663,394 13,700,000 60,750,913 74,450,913 (14,438,751 ) 60,012,162 — Park Hacienda (fka Hacienda) Pleasanton, CA — 2000 540 43,200,000 128,753,359 4,858,184 43,200,000 133,611,543 176,811,543 (34,884,871 ) 141,926,672 — Park West (CA) Los Angeles, CA — 1987/1990 444 3,033,500 27,302,383 11,262,203 3,033,500 38,564,586 41,598,086 (29,343,622 ) 12,254,464 — Parkside Union City, CA — 1979 208 6,246,700 11,827,453 7,163,451 6,246,700 18,990,904 25,237,604 (12,327,804 ) 12,909,800 — Pearl, The (WA) Seattle, WA G 2008 80 6,972,585 26,527,415 999,509 6,972,585 27,526,924 34,499,509 (3,981,489 ) 30,518,020 — Pearl MDR (fka Oakwood Marina Del Rey) Marina Del Rey, CA G 1969 597 — 120,795,359 4,778,318 — 125,573,677 125,573,677 (33,800,305 ) 91,773,372 — Pegasus Los Angeles, CA G 1949/2003 322 18,094,052 81,905,948 6,080,345 18,094,052 87,986,293 106,080,345 (29,282,736 ) 76,797,609 — Playa Pacifica Hermosa Beach, CA — 1972 285 35,100,000 33,473,822 23,015,281 35,100,000 56,489,103 91,589,103 (28,347,617 ) 63,241,486 — Portofino Chino Hills, CA — 1989 176 3,572,400 14,660,994 3,777,392 3,572,400 18,438,386 22,010,786 (13,473,788 ) 8,536,998 — Portofino (Val) Valencia, CA — 1989 216 8,640,000 21,487,126 5,637,028 8,640,000 27,124,154 35,764,154 (16,434,227 ) 19,329,927 — Portside Towers Jersey City, NJ G 1992-1997 527 22,487,006 96,842,913 23,175,339 22,487,006 120,018,252 142,505,258 (84,850,599 ) 57,654,659 — Potrero 1010 San Francisco, CA G 2016 453 40,830,011 179,509,834 120,105 40,830,011 179,629,939 220,459,950 (18,869,635 ) 201,590,315 — Prado (fka Glendale) Glendale, CA — 1988 264 — 67,977,313 4,453,741 — 72,431,054 72,431,054 (18,216,430 ) 54,214,624 — Prime, The Arlington, VA — 2002 273 34,625,000 77,879,740 1,499,005 34,625,000 79,378,745 114,003,745 (30,036,655 ) 83,967,090 — Prism at Park Avenue South (fka 400 Park Avenue South) New York, NY G 2015 269 76,292,169 171,558,177 127,665 76,292,169 171,685,842 247,978,011 (25,554,087 ) 222,423,924 — Promenade at Town Center I & II Valencia, CA — 2001 564 28,200,000 69,795,915 9,741,254 28,200,000 79,537,169 107,737,169 (41,393,133 ) 66,344,036 — Providence Bothell, WA — 2000 200 3,573,621 19,055,505 3,095,294 3,573,621 22,150,799 25,724,420 (11,070,038 ) 14,654,382 — Quarry Hills Quincy, MA — 2006 316 26,900,000 84,411,162 2,829,890 26,900,000 87,241,052 114,141,052 (22,257,122 ) 91,883,930 — Radius Uptown Denver, CO — 2017 372 13,644,960 121,899,032 93,774 13,644,960 121,992,806 135,637,766 (3,902,658 ) 131,735,108 — Red 160 (fka Redmond Way) Redmond, WA G 2011 250 15,546,376 65,320,010 1,306,822 15,546,376 66,626,832 82,173,208 (18,309,824 ) 63,863,384 — Redmond Court Bellevue, WA — 1977 206 10,300,000 33,488,745 1,106,972 10,300,000 34,595,717 44,895,717 (9,833,862 ) 35,061,855 — Regency Palms Huntington Beach, CA — 1969 310 1,857,400 16,713,254 6,506,417 1,857,400 23,219,671 25,077,071 (18,325,451 ) 6,751,620 — Renaissance Villas Berkeley, CA G 1998 34 2,458,000 4,542,000 200,843 2,458,000 4,742,843 7,200,843 (2,002,770 ) 5,198,073 — Reserve at Clarendon Centre, The Arlington, VA G 2003 252 10,500,000 52,812,935 4,759,258 10,500,000 57,572,193 68,072,193 (30,673,683 ) 37,398,510 — Reserve at Eisenhower, The Alexandria, VA — 2002 226 6,500,000 34,585,060 4,515,799 6,500,000 39,100,859 45,600,859 (20,712,491 ) 24,888,368 — Reserve at Empire Lakes Rancho Cucamonga, CA — 2005 467 16,345,000 73,080,670 3,320,031 16,345,000 76,400,701 92,745,701 (36,394,123 ) 56,351,578 — Reserve at Mountain View (fka Mountain View) Mountain View, CA — 1965 180 27,000,000 33,029,605 7,621,478 27,000,000 40,651,083 67,651,083 (10,869,571 ) 56,781,512 — Reserve at Potomac Yard Alexandria, VA — 2002 588 11,918,917 68,862,641 15,256,457 11,918,917 84,119,098 96,038,015 (42,003,388 ) 54,034,627 — Reserve at Town Center I-III (WA) Mill Creek, WA G 2001, 2009, 2014 584 16,768,705 77,511,523 5,623,360 16,768,705 83,134,883 99,903,588 (33,572,969 ) 66,330,619 — Residences at Westgate I (fka Westgate II) Pasadena, CA G 2014 252 17,859,785 109,259,858 353,398 17,859,785 109,613,256 127,473,041 (22,357,191 ) 105,115,850 — Residences at Westgate II (fka Westgate III) Pasadena, CA G 2015 88 12,118,248 40,449,028 60,085 12,118,248 40,509,113 52,627,361 (5,850,705 ) 46,776,656 — Rianna I & II Seattle, WA G 2000/2002 156 4,430,000 29,298,096 1,133,335 4,430,000 30,431,431 34,861,431 (11,522,763 ) 23,338,668 — Ridgewood Village I&II San Diego, CA — 1997 408 11,809,500 34,004,048 5,830,811 11,809,500 39,834,859 51,644,359 (26,215,341 ) 25,429,018 — Riva Terra I (fka Redwood Shores) Redwood City, CA — 1986 304 34,963,355 84,587,658 4,579,233 34,963,355 89,166,891 124,130,246 (23,808,487 ) 100,321,759 — Riva Terra II (fka Harborside) Redwood City, CA — 1986 149 17,136,645 40,536,531 2,273,237 17,136,645 42,809,768 59,946,413 (10,623,659 ) 49,322,754 — Riverpark Redmond, WA G 2009 321 14,355,000 80,894,049 3,905,450 14,355,000 84,799,499 99,154,499 (24,557,962 ) 74,596,537 — Rivington, The Hoboken, NJ — 1999 240 34,340,640 112,110,289 524,731 34,340,640 112,635,020 146,975,660 (6,937,992 ) 140,037,668 — Rosecliff II Quincy, MA — 2005 130 4,922,840 30,202,160 1,342,588 4,922,840 31,544,748 36,467,588 (10,069,250 ) 26,398,338 — EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation December 31, 2018 Description Initial Cost to Company Cost Capitalized Subsequent to Acquisition (Improvements, net) (E) Gross Amount Carried at Close of Period 12/31/18 Apartment Name Location Retail/ Commercial Space Date of Construction Apartment Units (H) Land Building & Fixtures Building & Fixtures Land Building & Fixtures (A) Total (B) Accumulated Depreciation (C) Investment in Real Estate, Net at 12/31/18 Encumbrances Sakura Crossing Los Angeles, CA G 2009 230 14,641,990 42,858,010 1,440,822 14,641,990 44,298,832 58,940,822 (14,646,231 ) 44,294,591 — Seventh & James Seattle, WA G 1992 96 663,800 5,974,803 4,466,962 663,800 10,441,765 11,105,565 (7,764,932 ) 3,340,633 — Sheffield Court Arlington, VA — 1986 597 3,342,381 31,337,332 15,840,921 3,342,381 47,178,253 50,520,634 (37,713,141 ) 12,807,493 — Siena Terrace Lake Forest, CA — 1988 356 8,900,000 24,083,024 7,343,477 8,900,000 31,426,501 40,326,501 (21,400,131 ) 18,926,370 — Skycrest Valencia, CA — 1999 264 10,560,000 25,574,457 5,774,667 10,560,000 31,349,124 41,909,124 (18,371,799 ) 23,537,325 — Skyhouse Denver Denver, CO G 2017 354 13,562,331 126,360,129 98,231 13,562,331 126,458,360 140,020,691 (3,622,426 ) 136,398,265 — Skylark Union City, CA — 1986 174 1,781,600 16,731,916 5,618,577 1,781,600 22,350,493 24,132,093 (14,414,952 ) 9,717,141 — Skyline Terrace Burlingame, CA — 1967 & 1987 138 16,836,000 35,414,000 8,156,471 16,836,000 43,570,471 60,406,471 (15,013,850 ) 45,392,621 — Skyline Towers Falls Church, VA G 1971 939 78,278,200 91,485,591 45,016,303 78,278,200 136,501,894 214,780,094 (77,594,870 ) 137,185,224 — Skyview Rancho Santa Margarita, CA — 1999 260 3,380,000 21,952,863 5,500,993 3,380,000 27,453,856 30,833,856 (17,769,582 ) 13,064,274 — SoMa II San Francisco, CA — (F) — 29,406,606 5,741,605 — 29,406,606 5,741,605 35,148,211 — 35,148,211 — Sonterra at Foothill Ranch Foothill Ranch, CA — 1997 300 7,503,400 24,048,507 6,018,250 7,503,400 30,066,757 37,570,157 (19,961,454 ) 17,608,703 — South City Station (fka South San Francisco) San Francisco, CA G 2007 368 68,900,000 79,476,861 4,611,766 68,900,000 84,088,627 152,988,627 (21,524,365 ) 131,464,262 — Southwood Palo Alto, CA — 1985 100 6,936,600 14,324,069 6,760,016 6,936,600 21,084,085 28,020,685 (12,852,392 ) 15,168,293 — Springbrook Estates Riverside, CA — (F) — 18,200,000 1,145,000 — 18,200,000 1,145,000 19,345,000 — 19,345,000 — Springline Seattle, WA G 2016 136 9,163,667 47,910,981 390,699 9,163,667 48,301,680 57,465,347 (4,533,798 ) 52,931,549 — Summerset Village II Chatsworth, CA — (F) — 260,646 — — 260,646 — 260,646 — 260,646 — Summit at Sausalito (fka Sausalito) Sausalito, CA — 1978 198 26,000,000 28,435,024 9,140,862 26,000,000 37,575,886 63,575,886 (11,439,522 ) 52,136,364 — Ten23 (fka 500 West 23rd Street) New York, NY G 2011 111 — 58,881,873 337,851 — 59,219,724 59,219,724 (14,245,570 ) 44,974,154 — Terraces, The San Francisco, C

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Summary Of Significant Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Due to the Company’s ability as general partner to control either through ownership or by contract the Operating Partnership and its subsidiaries, the Operating Partnership and each such subsidiary has been consolidated with the Company for financial reporting purposes, except for our unconsolidated properties/entities.
Real Estate Assets And Depreciation Of Investment In Real Estate	Real Estate Assets and Depreciation of Investment in Real Estate Effective January 1, 2017 with the adoption of the new standard which clarified the definition of a business (discussed below in Recently Adopted Accounting Pronouncements For asset acquisitions, the Company allocates the purchase price of the net tangible and identified intangible assets on a relative fair value basis. In making estimates of relative fair values for purposes of allocating purchase price, the Company utilizes a number of sources, including independent appraisals that may be obtained in connection with the acquisition or financing of the respective property, our own analysis of recently acquired and existing comparable properties in our portfolio and other market data. The Company also considers information obtained about each property as a result of its pre-acquisition due diligence, marketing and leasing activities in estimating the relative fair value of the tangible and intangible assets/liabilities acquired. The Company allocates the purchase price of acquired real estate to various components as follows: • Land – Based on actual purchase price adjusted to an allocation of the relative fair value (as necessary) if acquired separately or market research/comparables if acquired with an operating property. • Furniture, Fixtures and Equipment – Ranges between $10,000 and $35,000 per apartment unit acquired as an estimate of the allocation of the relative fair value of the appliances and fixtures inside an apartment unit. The per-apartment unit amount applied depends on the economic age of the apartment building acquired. Depreciation is calculated on the straight-line method over an estimated useful life of five to ten years. • Lease Intangibles – The Company considers the value of acquired in-place leases and above/below market leases and the amortization period is the average remaining term of each respective acquired lease. In-place residential leases’ average term at acquisition approximates six months. In-place retail leases’ term at acquisition approximates the average remaining term of all acquired retail leases. See Note 4 for more information on above and below market leases. • Other Intangible Assets – The Company considers whether it has acquired other intangible assets, including any customer relationship intangibles and the amortization period is the estimated useful life of the acquired intangible asset. • Building – Based on the allocation of the relative fair value determined on an “as-if vacant” basis. Depreciation is calculated on the straight-line method over an estimated useful life of thirty years. • Site Improvements – Based on replacement cost, which approximates the allocation of the relative fair value. Depreciation is calculated on the straight-line method over an estimated useful life of eight years. • Long-Term Debt – The Company calculates the allocation of the relative fair value by discounting the remaining contractual cash flows on each instrument at the current market rate for those borrowings. Replacements inside an apartment unit such as appliances and carpeting are depreciated over an estimated useful life of five to ten years. Renovation expenditures for ordinary maintenance and repairs are expensed to operations as incurred and significant renovations and improvements that improve and/or extend the useful life of the asset are capitalized over their estimated useful life, generally five to fifteen years. Initial direct leasing costs are expensed as incurred as such expense approximates the deferral and amortization of initial direct leasing costs over the lease terms. Property sales or dispositions are recorded when control transfers to unrelated third parties, contingencies have been removed and sufficient cash consideration has been received by the Company. Upon disposition, the related costs and accumulated depreciation are removed from the respective accounts. Any gain or loss on sale is recognized in accordance with accounting principles generally accepted in the United States. The Company classifies real estate assets as real estate held for sale when it is probable a property will be disposed of (see below for further discussion). The Company classifies properties under development and/or expansion and properties in the lease-up phase (including land) as construction-in-progress until construction has been completed and certificates of occupancy permits have been obtained.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The Company periodically evaluates its long-lived assets, including its investments in real estate, for indicators of impairment. The judgments regarding the existence of impairment indicators are based on factors such as operational performance, market conditions and legal and environmental concerns, as well as the Company’s ability to hold and its intent with regard to each asset. Future events could occur which would cause the Company to conclude that impairment indicators exist and an impairment loss is warranted. If impairment indicators exist, the Company performs the following: • For long-lived operating assets to be held and used, the Company compares the expected future undiscounted cash flows for the long-lived asset against the carrying amount of that asset. If the sum of the estimated undiscounted cash flows is less than the carrying amount of the asset, the Company would record an impairment loss for the difference between the estimated fair value and the carrying amount of the asset. • For long-lived non-operating assets (projects under development and land held for development), management evaluates major cost overruns, market conditions that could affect lease-up projections, intent and ability to hold the asset and any other indicators of impairment. If any of the indicators were to suggest impairment was present, the carrying value of the asset would be adjusted accordingly to fair value. • For long-lived assets to be disposed of, an impairment loss is recognized when the estimated fair value of the asset, less the estimated cost to sell, is less than the carrying amount of the asset measured at the time that the Company has determined it will sell the asset. Long-lived assets held for sale and the related liabilities are separately reported, with the long-lived assets reported at the lower of their carrying amounts or their estimated fair values, less their costs to sell, and are not depreciated after reclassification to real estate held for sale.
Cost Capitalization	Cost Capitalization See the Real Estate Assets and Depreciation of Investment in Real Estate For all development projects, the Company uses its professional judgment in determining whether such costs meet the criteria for capitalization or must be expensed as incurred. The Company capitalizes interest, real estate taxes and insurance and payroll and associated costs for those individuals directly responsible for and who spend their time on development activities, with capitalization ceasing no later than 90 days following issuance of the certificate of occupancy. These costs are reflected on the balance sheets as construction-in-progress for each specific property. The Company expenses as incurred all payroll costs of on-site employees working directly at our properties, except as noted above on our development properties prior to certificate of occupancy issuance and on specific major renovations at selected properties when additional incremental employees are hired. During the years ended December 31, 2018, 2017 and 2016, the Company capitalized $13.2 million, $14.7 million and $18.7 million, respectively, of payroll and associated costs of employees directly responsible for and who spend their time on the execution and supervision of development activities as well as major capital and/or renovation projects.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all demand deposits, money market accounts and investments in certificates of deposit and repurchase agreements purchased with a maturity of three months or less at the date of purchase to be cash equivalents. The Company maintains its cash and cash equivalents at financial institutions. The combined account balances at one or more institutions typically exceed the Federal Depository Insurance Corporation (“FDIC”) insurance coverage, and, as a result, there is a concentration of credit risk related to amounts on deposit in excess of FDIC insurance coverage. The Company believes that the risk is not significant, as the Company does not anticipate the financial institutions’ non-performance.
Fair Value of Financial Instruments, Including Derivative Instruments	Fair Value of Financial Instruments, Including Derivative Instruments The valuation of financial instruments requires the Company to make estimates and judgments that affect the fair value of the instruments. The Company, where possible, bases the fair values of its financial instruments, including its derivative instruments, on listed market prices and third party quotes. Where these are not available, the Company bases its estimates on current instruments with similar terms and maturities or on other factors relevant to the financial instruments. In the normal course of business, the Company is exposed to the effect of interest rate changes. The Company seeks to manage these risks by following established risk management policies and procedures including the use of derivatives to hedge interest rate risk on debt instruments. The Company may also use derivatives to manage commodity prices in the daily operations of the business. The Company has a policy of only entering into contracts with major financial institutions based upon their credit ratings and other factors. When viewed in conjunction with the underlying and offsetting exposure that the derivatives are designed to hedge, the Company has not sustained a material loss from these instruments nor does it anticipate any material adverse effect on its net income or financial position in the future from the use of derivatives it currently has in place. The Company recognizes all derivatives as either assets or liabilities in the consolidated balance sheets and measures those instruments at fair value. In addition, fair value adjustments will affect either shareholders’ equity/partners’ capital or net income depending on whether the derivative instruments qualify as a hedge for accounting purposes and, if so, the nature of the hedging activity. When the terms of an underlying transaction are modified, or when the underlying transaction is terminated or completed, all changes in the fair value of the instrument are marked-to-market with changes in value included in net income each period until the instrument matures. Any derivative instrument used for risk management that does not meet the hedging criteria is marked-to-market each period. The Company does not use derivatives for trading or speculative purposes.
Revenue Recognition	Revenue Recognition Rental income attributable to residential leases is recorded on a straight-line basis, which is not materially different than if it were recorded when due from residents and recognized monthly as it was earned. Leases entered into between a resident and a property for the rental of an apartment unit are generally year-to-year, renewable upon consent of both parties on an annual or monthly basis. Rental income attributable to retail/commercial leases is also recorded on a straight-line basis. Retail/commercial leases generally have five to ten year lease terms with market based renewal options. Fee and asset management revenue and interest income are recorded on an accrual basis.
Share-Based Compensation	Share-Based Compensation The Company expenses share-based compensation such as restricted shares, restricted units and share options. Any common share of beneficial interest, $0.01 par value per share (the “Common Shares”) issued pursuant to EQR’s incentive equity compensation and employee share purchase plans will result in ERPOP issuing units of partnership interest (“OP Units”) to EQR on a one-for-one basis, with ERPOP receiving the net cash proceeds of such issuances. See Note 12 for further discussion. The fair value of the option grants are recognized over the requisite service/vesting period of the options. The fair value for the Company’s share options was estimated at the time the share options were granted using the Black-Scholes option pricing model with the primary grant in each year having the following weighted average assumptions: 2018 2017 2016 Expected volatility (1) 14.8 % 15.3 % 26.3 % Expected life (2) 5 years 5 years 5 years Expected dividend yield (3) 3.09 % 3.08 % 3.04 % Risk-free interest rate (4) 2.52 % 1.93 % 1.27 % Option valuation per share $ 6.15 $ 5.86 $ 13.02 (1) Expected volatility – For the 2018 and 2017 grants, estimated based on the historical five-year volatility (the period matching the expected life) of EQR’s share price measured on a monthly basis. For the 2016 grant, estimated based on the historical ten-year volatility of EQR’s share price measured on a monthly basis. This change in estimate reflects the Company’s belief that the historical five-year period provides a better estimate of the expected volatility in EQR shares over the expected life of the options. (2) Expected life – Approximates the actual weighted average life of all share options granted since the Company went public in 1993. (3) Expected dividend yield – Calculated by averaging the historical annual yield on EQR shares for a period matching the expected life of each grant, with the annual yield calculated by dividing actual regular dividends (excluding any special dividends) by the average price of EQR’s shares in a given year. (4) Risk-free interest rate – The most current U.S. Treasury rate available prior to the grant date for a period matching the expected life of each grant. The valuation method and assumptions are the same as those the Company used in accounting for option expense in its consolidated financial statements. The Black-Scholes option valuation model was developed for use in estimating the fair value of traded options that have no vesting restrictions and are fully transferable. This model is only one method of valuing options. Because the Company’s share options have characteristics significantly different from those of traded options, and because changes in the subjective input assumptions can materially affect the fair value estimate, the actual value of the options to the recipient may be significantly different.
Income and Other Taxes	Income and Other Taxes Due to the structure of EQR as a REIT and the nature of the operations of its operating properties, no provision for federal income taxes has been made at the EQR level. In addition, ERPOP generally is not liable for federal income taxes as the partners recognize their proportionate share of income or loss in their tax returns; therefore no provision for federal income taxes has been made at the ERPOP level. Historically, the Company has generally only incurred certain state and local income, excise and franchise taxes. The Company has elected taxable REIT subsidiary (“TRS”) status for certain of its corporate subsidiaries and as a result, these entities will incur both federal and state income taxes on any taxable income of such entities after consideration of any net operating losses. Deferred tax assets and liabilities were recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases in the comparable periods. These assets and liabilities were measured using enacted tax rates for which the temporary differences were expected to be recovered or settled. The effects of changes in tax rates on deferred tax assets and liabilities were recognized in earnings in the period enacted. The Company’s deferred tax assets were generally the result of tax affected suspended interest deductions, net operating losses, differing depreciable lives on capitalized assets and the timing of expense recognition for certain accrued liabilities. The Company elected REIT status for its primary TRS upon filing the 2016 tax return in the third quarter of 2017, with the election retroactive to January 1, 2016. As a result, the Company wrote-off its deferred tax assets, which were fully reserved, in the third quarter of 2017. In December 2017, the President signed into law H.R. 1, informally titled the Tax Cuts and Jobs Act (the “Tax Act”). As of December 31, 2018, the Tax Act did not have a material impact on our REIT or subsidiary entities, our ability to continue to qualify as a REIT or on our results of operations. The Company provided for income, franchise and excise taxes allocated as follows in the consolidated statements of operations and comprehensive income for the years ended December 31, 2018, 2017 and 2016 (amounts in thousands): Year Ended December 31, 2018 2017 2016 Income and other tax expense (benefit) (1) $ 878 $ 478 $ 1,613 Discontinued operations, net (2) — — 12 Provision for income, franchise and excise taxes (3) $ 878 $ 478 $ 1,625 (1) Primarily includes state and local income, excise and franchise taxes. (2) Primarily represents state and local income, excise and franchise taxes on operating properties sold prior to January 1, 2014 and included in discontinued operations. The amounts included in discontinued operations for the year ended December 31, 2016 represent trailing activity for properties sold in 2013 and prior years. None of the properties sold during the years ended December 31, 2018, 2017 and 2016 met the criteria for reporting discontinued operations. (3) All provisions for income tax amounts are current and none are deferred. During the years ended December 31, 2018, 2017 and 2016, the Company’s tax treatment of dividends and distributions were as follows (unaudited): Year Ended December 31, 2018 (1) 2017 (2) 2016 Tax treatment of dividends and distributions: Ordinary dividends $ 1.84454 $ 1.22126 $ 0.722 Long-term capital gain 0.21423 0.18959 9.176 Unrecaptured section 1250 gain 0.06498 0.10040 3.117 Dividends and distributions per Common Share/Unit outstanding $ 2.12375 $ 1.51125 $ 13.015 (1) The Company’s fourth quarter 2018 dividends and distributions of $0.54 per Common Share/Unit outstanding will be included as taxable income in calendar year 2019. (2) The Company’s fourth quarter 2017 dividends and distributions of $0.50375 per Common Share/Unit outstanding will be included as taxable income in calendar year 2018. The unaudited cost of land and depreciable property, net of accumulated depreciation, for federal income tax purposes as of December 31, 2018 and 2017 was approximately $14.0 billion and $14.8 billion, respectively.
Noncontrolling Interests	Noncontrolling Interests A noncontrolling interest in a subsidiary (minority interest) is an ownership interest in the consolidated entity that should be reported as equity in the consolidated financial statements and separate from the parent company’s equity. In addition, consolidated net income is required to be reported at amounts that include the amounts attributable to both the parent and the noncontrolling interest and the amount of consolidated net income attributable to the parent and the noncontrolling interest are required to be disclosed on the face of the consolidated statements of operations and comprehensive income. See Note 3 for further discussion. Operating Partnership: Net income is allocated to noncontrolling interests based on their respective ownership percentage of the Operating Partnership. The ownership percentage is calculated by dividing the number of OP Units held by the noncontrolling interests by the total OP Units held by the noncontrolling interests and EQR. Issuance of additional Common Shares and OP Units changes the ownership interests of both the noncontrolling interests and EQR. Such transactions and the related proceeds are treated as capital transactions. Partially Owned Properties: The Company reflects noncontrolling interests in partially owned properties on the balance sheet for the portion of properties consolidated by the Company that are not wholly owned by the Company. The earnings or losses from those properties attributable to the noncontrolling interests are generally based on ownership percentage and are reflected as noncontrolling interests in partially owned properties in the consolidated statements of operations and comprehensive income. Partners’ Capital The “Limited Partners” of ERPOP include various individuals and entities that contributed their properties to ERPOP in exchange for OP Units. The “General Partner” of ERPOP is EQR. Net income is allocated to the Limited Partners based on their respective ownership percentage of ERPOP. The ownership percentage is calculated by dividing the number of OP Units held by the Limited Partners by the total OP Units held by the Limited Partners and the General Partner. Issuance of additional Common Shares and OP Units changes the ownership interests of both the Limited Partners and EQR. Such transactions and the related proceeds are treated as capital transactions. Redeemable Noncontrolling Interests – Operating Partnership / Redeemable Limited Partners The Company classifies Redeemable Noncontrolling Interests – Operating Partnership / Redeemable Limited Partners in the mezzanine section of the consolidated balance sheets for the portion of OP Units that EQR is required, either by contract or securities law, to deliver registered Common Shares to the exchanging OP Unit holder. The redeemable noncontrolling interest units / redeemable limited partner units are adjusted to the greater of carrying value or fair market value based on the Common Share price of EQR at the end of each respective reporting period. See Note 3 for further discussion.
Use of Estimates	Use of Estimates In preparation of the Company’s financial statements in conformity with accounting principles generally accepted in the United States, management makes estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates.
Reclassifications	Reclassifications Certain reclassifications considered necessary for a fair presentation have been made to the prior period financial statements in order to conform to the current year presentation. These reclassifications have not changed the results of operations or equity/capital.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In • Lessors – Leases are accounted for using an approach that is substantially equivalent to existing guidance for operating, sales-type and financing leases, but aligned with the new revenue recognition standard. Lessors are required to allocate lease payments to separate lease and non-lease components of each lease agreement, with the non-lease components evaluated under the new revenue recognition standard. • Lessees – Leases are accounted for using a dual approach, classifying leases as either operating or finance based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee. This classification determines whether the lease expense is recognized on a straight-line basis over the term of the lease (for operating leases) or based on an effective interest method (for finance leases). A lessee is also required to record a right-of-use asset and a lease liability on its balance sheet for all leases with a term of greater than 12 months regardless of their classification as operating or finance leases. Leases with a term of 12 months or less are accounted for similar to existing guidance for operating leases. The new standard was effective for the Company effective January 1, 2019. The new standard was adopted using a modified retrospective method and the Company applied the new guidance as of the adoption date and elected certain practical expedients as described below. The Company is the lessor for its residential and retail/commercial leases and these leases will continue to be accounted for as operating leases under the new standard. Therefore, the Company did not have significant changes in the accounting for its lease revenues. The Company is the lessee under various corporate office and ground leases, which will be recognized as right of use assets and related lease liabilities on its consolidated balance sheets in the first quarter of 2019. The Company’s corporate office leases where it is the lessee will continue to be accounted for as operating leases under the new standard. Based on its election of the practical expedients, the Company was not required to reassess the classification of existing ground leases and therefore these leases will continue to be accounted for as operating leases. However, in the event we materially modify existing ground leases and/or enter into new ground leases after adoption of the new standard, such leases will likely be classified as finance leases. The Company will record right of use assets and related lease liabilities to its opening balance sheet upon adoption of the new standard on January 1, 2019 that will approximate $300.0 million. The Company has determined the approximate discount rate ranges of 3.3% to 3.9% for corporate office leases and 4.4% to 5.5% for ground leases. The discount rates were determined using the Company’s borrowing rates (actual pricing through 30 years and other long-term market rates). In July 2018, the FASB issued an amendment to the new leases standard, which includes a practical expedient that provides lessors an option not to separate lease and non-lease components when certain criteria are met and instead account for those components as a single component under the new leases standard. The amendment also provides a transition option that permits the application of the new guidance as of the adoption date rather than to all periods presented. The Company elected the practical expedient to account for both its lease and non-lease components as a single component under the leases standard and elected the new transition option as of the date of adoption effective January 1, 2019. In June 2016, the FASB In August 2017, the FASB issued a final standard which makes changes to the hedge accounting model to enable entities to better portray their risk management activities in the financial statements. The new standard expands an entity’s ability to hedge nonfinancial and financial risk components, reduces complexity in fair value hedges of interest rate risk and eases certain documentation and assessment requirements. The new standard also eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of any hedging instrument to be presented in the same income statement line as the hedged instrument. The Company adopted this new standard as required effective January 1, 2019 and it did not have a material effect on its consolidated results of operations or financial position. Recently Adopted Accounting Pronouncements In FASB Revenue from Contracts with Customers any, For the remaining approximately 6% of rental income that is subject to the new revenue recognition standard, the Company’s disaggregated revenue streams are disclosed in the table below for the year ended December 31, 2018. These revenue streams have the same timing and pattern of revenue recognition across our reportable segments, with consistent allocations between the leasing and revenue recognition standards. The revenue streams and percentages are comparable with the percentage of rental income for the years ended December 31, 2017 and 2016. The following table presents the disaggregation of revenue streams of our rental income for the year ended December 31, 2018 (amounts in thousands): Year Ended December 31, 2018 Revenue Stream Applicable Standard Amount of Rental Income Percentage of Rental Income Leasing revenue Leases $ 2,418,168 93.8 % Utility recoveries (“RUBS”) Revenue Recognition 63,218 2.5 % Parking revenue Revenue Recognition 26,743 1.0 % Other revenue Revenue Recognition 69,552 2.7 % Rental income $ 2,577,681 100.0 % Additionally, as part of the new revenue recognition standard, the FASB issued amendments related to partial sales of real estate. Adoption of the new partial sales standard did not result in a change of accounting for the Company related to its disposition process. We concluded that the Company’s typical dispositions will continue to meet the criteria for sale and associated profit recognition under both new standards. In January 2016, the FASB issued a new standard which requires companies to measure all equity securities with readily determinable fair values at fair value on the balance sheet, with changes in fair value recognized in net income. The Company adopted this new standard as required effective January 1, 2018 and it did not have a material effect on its consolidated results of operations or financial position. In FASB • Cash payments related to debt prepayments or extinguishment costs are to be classified within financing • The portion of the cash payment made to settle a zero-coupon bond or a bond with an insignificant cash coupon attributable to accreted interest related to a debt discount is to be classified as a cash outflow within operating activities, and the portion attributable to the principal is to be classified within financing • Insurance settlement proceeds are to be classified based on the nature of the • Companies must elect to classify distributions received from equity method investees using either a cumulative earnings approach or a look-through approach and the election must be disclosed; • Restricted Total The While overall cash flows did not change, there were changes between cash flow classifications due primarily to the debt prepayment penalties that the Company had incurred in comparative periods. In FASB
Other	Other The Company is the controlling partner in various consolidated partnerships owning 17 properties consisting of 3,535 apartment units having a noncontrolling interest deficit balance of $2.3 million at December 31, 2018. The Company is required to make certain disclosures regarding noncontrolling interests in consolidated limited-life subsidiaries. Of the consolidated entities described above, the Company is the controlling partner in limited-life partnerships owning four properties having a noncontrolling interest deficit balance of $9.6 million. These four partnership agreements contain provisions that require the partnerships to be liquidated through the sale of their assets upon reaching a date specified in each respective partnership agreement. The Company, as controlling partner, has an obligation to cause the property owning partnerships to distribute the proceeds of liquidation to the Noncontrolling Interests in these Partially Owned Properties only to the extent that the net proceeds received by the partnerships from the sale of their assets warrant a distribution based on the partnership agreements. As of December 31, 2018 the Company estimates the value of Noncontrolling Interest distributions for these four properties would have been approximately $70.4 million (“Settlement Value”) had the partnerships been liquidated. This Settlement Value is based on estimated third party consideration realized by the partnerships upon disposition of the four Partially Owned Properties and is net of all other assets and liabilities, including yield maintenance on the mortgages encumbering the properties, that would have been due on December 31, 2018 had those mortgages been prepaid. Due to, among other things, the inherent uncertainty in the sale of real estate assets, the amount of any potential distribution to the Noncontrolling Interests in the Company’s Partially Owned Properties is subject to change. To the extent that the partnerships’ underlying assets are worth less than the underlying liabilities, the Company has no obligation to remit any consideration to the Noncontrolling Interests in these Partially Owned Properties.

Business (Tables)

Business (Tables)	12 Months Ended
	Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Ownership Breakdown	The ownership breakdown includes (table does not include various uncompleted development properties): Properties Apartment Units Wholly Owned Properties 287 74,840 Master-Leased Property – Consolidated 1 162 Partially Owned Properties – Consolidated 17 3,535 Partially Owned Properties – Unconsolidated 2 945 307 79,482

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Summary Of Significant Accounting Policies [Abstract]
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology	The fair value of the option grants are recognized over the requisite service/vesting period of the options. The fair value for the Company’s share options was estimated at the time the share options were granted using the Black-Scholes option pricing model with the primary grant in each year having the following weighted average assumptions: 2018 2017 2016 Expected volatility (1) 14.8 % 15.3 % 26.3 % Expected life (2) 5 years 5 years 5 years Expected dividend yield (3) 3.09 % 3.08 % 3.04 % Risk-free interest rate (4) 2.52 % 1.93 % 1.27 % Option valuation per share $ 6.15 $ 5.86 $ 13.02 (1) Expected volatility – For the 2018 and 2017 grants, estimated based on the historical five-year volatility (the period matching the expected life) of EQR’s share price measured on a monthly basis. For the 2016 grant, estimated based on the historical ten-year volatility of EQR’s share price measured on a monthly basis. This change in estimate reflects the Company’s belief that the historical five-year period provides a better estimate of the expected volatility in EQR shares over the expected life of the options. (2) Expected life – Approximates the actual weighted average life of all share options granted since the Company went public in 1993. (3) Expected dividend yield – Calculated by averaging the historical annual yield on EQR shares for a period matching the expected life of each grant, with the annual yield calculated by dividing actual regular dividends (excluding any special dividends) by the average price of EQR’s shares in a given year. (4) Risk-free interest rate – The most current U.S. Treasury rate available prior to the grant date for a period matching the expected life of each grant.
Allocation Of Income Franchise And Excise Taxes In Consolidated Statements Of Operations	The Company provided for income, franchise and excise taxes allocated as follows in the consolidated statements of operations and comprehensive income for the years ended December 31, 2018, 2017 and 2016 (amounts in thousands): Year Ended December 31, 2018 2017 2016 Income and other tax expense (benefit) (1) $ 878 $ 478 $ 1,613 Discontinued operations, net (2) — — 12 Provision for income, franchise and excise taxes (3) $ 878 $ 478 $ 1,625 (1) Primarily includes state and local income, excise and franchise taxes. (2) Primarily represents state and local income, excise and franchise taxes on operating properties sold prior to January 1, 2014 and included in discontinued operations. The amounts included in discontinued operations for the year ended December 31, 2016 represent trailing activity for properties sold in 2013 and prior years. None of the properties sold during the years ended December 31, 2018, 2017 and 2016 met the criteria for reporting discontinued operations. (3) All provisions for income tax amounts are current and none are deferred.
Tax Treatment Of Dividends And Distributions	During the years ended December 31, 2018, 2017 and 2016, the Company’s tax treatment of dividends and distributions were as follows (unaudited): Year Ended December 31, 2018 (1) 2017 (2) 2016 Tax treatment of dividends and distributions: Ordinary dividends $ 1.84454 $ 1.22126 $ 0.722 Long-term capital gain 0.21423 0.18959 9.176 Unrecaptured section 1250 gain 0.06498 0.10040 3.117 Dividends and distributions per Common Share/Unit outstanding $ 2.12375 $ 1.51125 $ 13.015 (1) The Company’s fourth quarter 2018 dividends and distributions of $0.54 per Common Share/Unit outstanding will be included as taxable income in calendar year 2019. (2) The Company’s fourth quarter 2017 dividends and distributions of $0.50375 per Common Share/Unit outstanding will be included as taxable income in calendar year 2018.
Schedule of Disaggregation of Revenue Streams of Rental Income and Percentage of Rental Income	The following table presents the disaggregation of revenue streams of our rental income for the year ended December 31, 2018 (amounts in thousands): Year Ended December 31, 2018 Revenue Stream Applicable Standard Amount of Rental Income Percentage of Rental Income Leasing revenue Leases $ 2,418,168 93.8 % Utility recoveries (“RUBS”) Revenue Recognition 63,218 2.5 % Parking revenue Revenue Recognition 26,743 1.0 % Other revenue Revenue Recognition 69,552 2.7 % Rental income $ 2,577,681 100.0 %

Equity, Capital and Other Int_2

Equity, Capital and Other Interests (Tables)	12 Months Ended
	Dec. 31, 2018
Changes in Issued and Outstanding Common Shares and Units	The following tables present the changes in the Company’s issued and outstanding Common Shares and “Units” (which includes OP Units and restricted units) for the years ended December 31, 2018, 2017 and 2016: 2018 2017 2016 Common Shares Common Shares outstanding at January 1, 368,018,082 365,870,924 364,755,444 Common Shares Issued: Conversion of OP Units 131,477 1,149,284 88,838 Exercise of share options 1,056,388 846,137 815,044 Employee Share Purchase Plan (ESPP) 75,414 68,286 63,909 Restricted share grants, net 123,800 83,451 147,689 Common Shares outstanding at December 31, 369,405,161 368,018,082 365,870,924 Units Units outstanding at January 1, 13,768,438 14,626,075 14,427,164 Restricted unit grants, net 267,074 291,647 287,749 Conversion of OP Units to Common Shares (131,477 ) (1,149,284 ) (88,838 ) Units outstanding at December 31, 13,904,035 13,768,438 14,626,075 Total Common Shares and Units outstanding at December 31, 383,309,196 381,786,520 380,496,999 Units Ownership Interest in Operating Partnership 3.6 % 3.6 % 3.8 %
Changes in Redemption Value of Redeemable Noncontrolling Interests and Limited Partners Interest	The following table presents the changes in the redemption value of the Redeemable Noncontrolling Interests – Operating Partnership for the years ended December 31, 2018, 2017 and 2016, respectively (amounts in thousands): 2018 2017 2016 Balance at January 1, $ 366,955 $ 442,092 $ 566,783 Change in market value 13,922 (41,916 ) (115,093 ) Change in carrying value (1,771 ) (33,221 ) (9,598 ) Balance at December 31, $ 379,106 $ 366,955 $ 442,092
Issued and Outstanding Preferred Shares and Preference Units	The following table presents the Company’s issued and outstanding Preferred Shares as of December 31, 2018 and 2017: Amounts in thousands Annual Call Dividend Per December 31, December 31, Date (1) Share (2) 2018 2017 Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized: 8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 745,600 shares issued and outstanding as of December 31, 2018 and 2017 12/10/26 $ 4.145 $ 37,280 $ 37,280 $ 37,280 $ 37,280 (1) On or after the call date, redeemable preferred shares may be redeemed for cash at the option of the Company, in whole or in part, at a redemption price equal to the liquidation price per share, plus accrued and unpaid distributions, if any. (2) Dividends on Preferred Shares are payable quarterly.
ERPOP [Member]
Changes in Issued and Outstanding Common Shares and Units	The following tables present the changes in the Operating Partnership’s issued and outstanding Units and in the limited partners’ Units for the years ended December 31, 2018, 2017 and 2016: 2018 2017 2016 General and Limited Partner Units General and Limited Partner Units outstanding at January 1, 381,786,520 380,496,999 379,182,608 Issued to General Partner: Exercise of EQR share options 1,056,388 846,137 815,044 EQR’s Employee Share Purchase Plan (ESPP) 75,414 68,286 63,909 EQR’s restricted share grants, net 123,800 83,451 147,689 Issued to Limited Partners: Restricted unit grants, net 267,074 291,647 287,749 General and Limited Partner Units outstanding at December 31, 383,309,196 381,786,520 380,496,999 Limited Partner Units Limited Partner Units outstanding at January 1, 13,768,438 14,626,075 14,427,164 Limited Partner restricted unit grants, net 267,074 291,647 287,749 Conversion of Limited Partner OP Units to EQR Common Shares (131,477 ) (1,149,284 ) (88,838 ) Limited Partner Units outstanding at December 31, 13,904,035 13,768,438 14,626,075 Limited Partner Units Ownership Interest in Operating Partnership 3.6 % 3.6 % 3.8 %
Changes in Redemption Value of Redeemable Noncontrolling Interests and Limited Partners Interest	The following table presents the changes in the redemption value of the Redeemable Limited Partners for the years ended December 31, 2018, 2017 and 2016, respectively (amounts in thousands): 2018 2017 2016 Balance at January 1, $ 366,955 $ 442,092 $ 566,783 Change in market value 13,922 (41,916 ) (115,093 ) Change in carrying value (1,771 ) (33,221 ) (9,598 ) Balance at December 31, $ 379,106 $ 366,955 $ 442,092
Issued and Outstanding Preferred Shares and Preference Units	The following table presents the Operating Partnership’s issued and outstanding “Preference Units” as of December 31, 2018 and 2017: Amounts in thousands Annual Call Dividend Per December 31, December 31, Date (1) Unit (2) 2018 2017 Preference Units: 8.29% Series K Cumulative Redeemable Preference Units; liquidation value $50 per unit; 745,600 units issued and outstanding as of December 31, 2018 and 2017 12/10/26 $ 4.145 $ 37,280 $ 37,280 $ 37,280 $ 37,280 (1) On or after the call date, redeemable preference units may be redeemed for cash at the option of the Operating Partnership, in whole or in part, at a redemption price equal to the liquidation price per unit, plus accrued and unpaid distributions, if any, in conjunction with the concurrent redemption of the corresponding Company Preferred Shares. (2) Dividends on Preference Units are payable quarterly.

Real Estate and Lease Intangi_2

Real Estate and Lease Intangibles (Tables)	12 Months Ended
	Dec. 31, 2018
Real Estate [Abstract]
Summary of Carrying Amounts of Investment in Real Estate	The following table summarizes the carrying amounts for the Company’s investment in real estate (at cost) as of December 31, 2018 and 2017 (amounts in thousands): 2018 2017 Land $ 5,875,803 $ 5,996,024 Depreciable property: Buildings and improvements 18,232,625 17,743,042 Furniture, fixtures and equipment 1,722,231 1,548,961 In-Place lease intangibles 481,045 476,359 Projects under development: Land 25,429 43,226 Construction-in-progress 83,980 120,321 Land held for development: Land 61,038 62,538 Construction-in-progress 28,871 36,425 Investment in real estate 26,511,022 26,026,896 Accumulated depreciation (6,696,281 ) (6,040,378 ) Investment in real estate, net $ 19,814,741 $ 19,986,518
Summary of Carrying Amounts of Above and Below Market Ground And Retail Lease Intangibles	The following table summarizes the carrying amounts for the Company’s above and below market ground and retail lease intangibles as of December 31, 2018 and 2017 (amounts in thousands): Description Balance Sheet 2018 2017 Assets Ground lease intangibles – below market Other Assets $ 191,918 $ 191,918 Retail lease intangibles – above market Other Assets 1,260 1,260 Lease intangible assets 193,178 193,178 Accumulated amortization (26,947 ) (22,434 ) Lease intangible assets, net $ 166,231 $ 170,744 Liabilities Ground lease intangibles – above market Other Liabilities $ 2,400 $ 2,400 Retail lease intangibles – below market Other Liabilities 1,710 5,270 Lease intangible liabilities 4,110 7,670 Accumulated amortization (1,704 ) (5,143 ) Lease intangible liabilities, net $ 2,406 $ 2,527
Summary of the Effect of the Amortization for Above and Below Market Ground and Retail Lease Intangibles	The following table provides a summary of the effect of the amortization for above and below market ground and retail lease intangibles on the Company’s accompanying consolidated statements of operations and comprehensive income for the years ended December 31, 2018, 2017 and 2016 (amounts in thousands): Description Income Statement Location 2018 2017 2016 Ground lease intangible amortization Property and Maintenance $ (4,463 ) $ (4,369 ) $ (4,321 ) Retail lease intangible amortization Rental Income 71 541 895 Total amortization of above/below market lease intangibles $ (4,392 ) $ (3,828 ) $ (3,426 )
Summary of Aggregate Amortization for Above and Below Market Ground And Retail Lease Intangibles	The following table provides a summary of the aggregate amortization for above and below market ground and retail lease intangibles for each of the next five years (amounts in thousands): 2019 2020 2021 2022 2023 Ground lease intangibles $ (4,463 ) $ (4,463 ) $ (4,463 ) $ (4,463 ) $ (4,463 ) Retail lease intangibles 71 71 71 27 19 Total $ (4,392 ) $ (4,392 ) $ (4,392 ) $ (4,436 ) $ (4,444 )
Acquired Properties From Unaffiliated Parties	During the year ended December 31, 2018, the Company acquired the entire equity interest in the following from unaffiliated parties (purchase price in thousands): Properties Apartment Units Purchase Price Rental Properties – Consolidated (1) 5 1,478 $ 707,005 Total 5 1,478 $ 707,005 (1) Purchase price includes an allocation of approximately $113.7 million to land and $594.4 million to depreciable property (inclusive of capitalized closing costs). During the year ended December 31, 2017, the Company acquired the entire equity interest in the following from unaffiliated parties (purchase price in thousands): Properties Apartment Units Purchase Price Rental Properties – Consolidated (1) 4 947 $ 468,050 Total 4 947 $ 468,050 (1) Purchase price includes an allocation of approximately $68.3 million to land, $386.2 million to depreciable property (inclusive of capitalized closing costs) and $13.7 million to ground lease intangible (included in other assets). For one of the property acquisitions, the Company owns the building and improvements and leases the land underlying the improvements under a long-term ground lease that expires in 2113. This property is consolidated and reflected as a real estate asset while the ground lease is accounted for as an operating lease.
Disposed Properties to Unaffiliated Parties	During the year ended December 31, 2018, the Company disposed of the following to unaffiliated parties (sales price in thousands): Properties Apartment Units Sales Price Rental Properties – Consolidated 5 1,292 $ 706,120 Land Parcels (one) — — 2,700 Total 5 1,292 $ 708,820 During the year ended December 31, 2017, the Company disposed of the following to unaffiliated parties (sales price in thousands): Properties Apartment Units Sales Price Rental Properties – Consolidated 5 1,194 $ 354,950 Land Parcels (one) — — 33,450 Total 5 1,194 $ 388,400

Commitments To Acquire_Dispos_2

Commitments To Acquire/Dispose of Real Estate (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments To Acquire Dispose Of Real Estate [Abstract]
Separate Agreements to Dispose of	The Company has entered into separate agreements to dispose of the following (sales price in thousands): Properties Apartment Units Sales Price Rental Properties - Consolidated 1 266 $ 237,500 Land Parcels (one) — — 1,900 Total 1 266 $ 239,400

Investments in Partially Owne_2

Investments in Partially Owned Entities (Tables)	12 Months Ended
	Dec. 31, 2018
Investments In Partially Owned Entities [Abstract]
Summary of Companys Investment in Unconsolidated Entities	The following table and information summarizes the Company’s investments in unconsolidated entities, which are accounted for under the equity method of accounting as the requirements for consolidation are not met, as of December 31, 2018 December 31, 2017 December 31, 2018 December 31, 2017 Ownership Percentage Investments in Unconsolidated Entities: Wisconsin Place Developer (VIE) (1) $ 42,365 $ 44,451 33.3% Operating Properties (Non-VIE) (2) 10,494 12,367 20.0% Other 5,490 1,436 Varies Investments in Unconsolidated Entities $ 58,349 $ 58,254 (1) Represents an unconsolidated interest in an entity that owns the land underlying one of the consolidated joint venture properties noted above and owns and operates a related parking facility. The joint venture, as a limited partner, does not have substantive kick-out or participating rights in the entity. As a result, the entity qualifies as a VIE. The joint venture does not have a controlling financial interest in the VIE and is not the VIE’s primary beneficiary. The joint venture does not have the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance or the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE. As a result, the entity that owns the land and owns and operates the parking facility is unconsolidated and recorded using the equity method of accounting. (2) Includes two joint ventures under separate agreements with the same partner totaling 945 apartment units.

Restricted Deposits (Tables)

Restricted Deposits (Tables)	12 Months Ended
	Dec. 31, 2018
Deposits Restricted [Abstract]
Restricted Deposits	The following table presents the Company’s restricted deposits as of December 31, 2018 and 2017 (amounts in thousands): December 31, 2018 December 31, 2017 Mortgage escrow deposits: Real estate taxes and insurance $ 876 $ 845 Replacement reserves 8,641 8,347 Mortgage principal reserves/sinking funds 9,754 3,167 Other 852 852 Mortgage escrow deposits 20,123 13,211 Restricted cash: Earnest money on pending acquisitions 5,000 750 Restricted deposits on real estate investments 540 58 Resident security and utility deposits 35,659 35,183 Other 7,549 913 Restricted cash 48,748 36,904 Restricted deposits $ 68,871 $ 50,115

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Summary of Unsecured Note Balances, Interest Rate and Maturity Date Information	The following tables summarize the Company’s unsecured note balances and certain interest rate and maturity date information as of and for the years ended December 31, 2018 and 2017, respectively: December 31, 2018 (Amounts in thousands) Net Principal Balance Interest Rate Ranges Weighted Average Interest Rate Maturity Date Ranges Fixed Rate Public Notes (1) $ 5,485,884 2.85% - 7.57% 4.37% 2020-2047 Floating Rate Public Notes (1) 447,402 (1) 2.84% 2019 Totals $ 5,933,286 4.25% December 31, 2017 (Amounts in thousands) Net Principal Balance Interest Rate Ranges Weighted Average Interest Rate Maturity Date Ranges Fixed Rate Public Notes (1) $ 4,591,373 2.85% - 7.57% 4.61% 2020-2047 Floating Rate Public Notes (1) 447,439 (1) 1.82% 2019 Totals $ 5,038,812 4.35% (1) Fair value interest rate swaps convert the $450.0 million 2.375% notes due July 1, 2019 to a floating interest rate of 90-Day LIBOR plus 0.61%.
Summary of Aggregate Payments of Principal on All Debt	The following table provides a summary of the aggregate payments of principal on all debt for each of the next five years and thereafter as of December 31, 2018 (amounts in thousands): Year Total 2019 $ 974,954 2020 1,129,292 2021 928,106 2022 266,141 2023 1,331,600 Thereafter 4,282,668 Subtotal 8,912,761 Deferred Financing Costs and Unamortized (Discount) (94,822 ) Total $ 8,817,939

Derivative and Other Fair Val_2

Derivative and Other Fair Value Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Summary of Carrying and Fair Values of Financial Instruments	The following table provides a summary of the carrying and fair values for the Company’s mortgage notes payable and unsecured debt (including its commercial paper and line of credit, if applicable) at December 31, 2018 and 2017, respectively (amounts in thousands): December 31, 2018 December 31, 2017 Carrying Value Estimated Fair Value (Level 2) Carrying Value Estimated Fair Value (Level 2) Mortgage notes payable, net $ 2,385,470 $ 2,352,502 $ 3,618,722 $ 3,615,384 Unsecured debt, net 6,432,469 6,481,426 5,338,569 5,619,744 Total debt, net $ 8,817,939 $ 8,833,928 $ 8,957,291 $ 9,235,128
Summary of Consolidated Derivative Instruments	The following table summarizes the Company’s consolidated derivative instruments at December 31, 2018 (dollar amounts are in thousands): Fair Value Hedges (1) Forward Starting Swaps (2) Current Notional Balance $ 450,000 $ 500,000 Lowest Interest Rate 2.375 % 2.2665 % Highest Interest Rate 2.375 % 3.1163 % Maturity Date 2019 2029 (1) Fair Value Hedges – Converts outstanding fixed rate unsecured notes ($450.0 million 2.375% (2) Forward Starting Swaps – Designed to partially fix interest rates in advance of planned future debt issuances. These swaps have mandatory counterparty terminations in 2020 and are targeted for certain 2019 debt issuances.
Summary of Fair Value Measurements for Each Major Category of Assets and Liabilities Measured at Fair Value on Recurring Basis	The following tables provide a summary of the fair value measurements for each major category of assets and liabilities measured at fair value on a recurring basis and the location within the accompanying consolidated balance sheets at December 31, 2018 and 2017, respectively (amounts in thousands): Fair Value Measurements at Reporting Date Using Description Balance Sheet Location 12/31/2018 Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps Other Assets $ 2,000 $ — $ 2,000 $ — Supplemental Executive Retirement Plan Other Assets 134,088 134,088 — — Total $ 136,088 $ 134,088 $ 2,000 $ — Liabilities Derivatives designated as hedging instruments: Interest Rate Contracts: Fair Value Hedges Other Liabilities $ 2,277 $ — $ 2,277 $ — Forward Starting Swaps Other Liabilities 9,851 — 9,851 — Supplemental Executive Retirement Plan Other Liabilities 134,088 134,088 — — Total $ 146,216 $ 134,088 $ 12,128 $ — Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Mezzanine $ 379,106 $ — $ 379,106 $ — Fair Value Measurements at Reporting Date Using Description Balance Sheet Location 12/31/2017 Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps Other Assets $ 5,143 $ — $ 5,143 $ — Supplemental Executive Retirement Plan Other Assets 140,159 140,159 — — Total $ 145,302 $ 140,159 $ 5,143 $ — Liabilities Derivatives designated as hedging instruments: Interest Rate Contracts: Fair Value Hedges Other Liabilities $ 1,597 $ — $ 1,597 $ — Supplemental Executive Retirement Plan Other Liabilities 140,159 140,159 — — Total $ 141,756 $ 140,159 $ 1,597 $ — Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Mezzanine $ 366,955 $ — $ 366,955 $ —
Summary of Effect of Fair Value Hedges on the Accompanying Consolidated Statements of Operations and Comprehensive Income	The following tables provide a summary of the effect of fair value hedges on the Company’s accompanying consolidated statements of operations and comprehensive income for the years ended December 31, 2018, 2017 and 2016, respectively (amounts in thousands): December 31, 2018 Type of Fair Value Hedge Location of Gain/(Loss) Recognized in Income on Derivative Amount of Gain/(Loss) Recognized in Income on Derivative Hedged Item Income Statement Location of Hedged Item Gain/(Loss) Amount of Gain/(Loss) Recognized in Income on Hedged Item Derivatives designated as hedging instruments: Interest Rate Contracts: Interest Rate Swaps Interest expense $ (680 ) Fixed rate debt Interest expense $ 680 Total $ (680 ) $ 680 December 31, 2017 Type of Fair Value Hedge Location of Gain/(Loss) Recognized in Income on Derivative Amount of Gain/(Loss) Recognized in Income on Derivative Hedged Item Income Statement Location of Hedged Item Gain/(Loss) Amount of Gain/(Loss) Recognized in Income on Hedged Item Derivatives designated as hedging instruments: Interest Rate Contracts: Interest Rate Swaps Interest expense $ (3,454 ) Fixed rate debt Interest expense $ 3,454 Total $ (3,454 ) $ 3,454 December 31, 2016 Type of Fair Value Hedge Location of Gain/(Loss) Recognized in Income on Derivative Amount of Gain/(Loss) Recognized in Income on Derivative Hedged Item Income Statement Location of Hedged Item Gain/(Loss) Amount of Gain/(Loss) Recognized in Income on Hedged Item Derivatives designated as hedging instruments: Interest Rate Contracts: Interest Rate Swaps Interest expense $ (1,798 ) Fixed rate debt Interest expense $ 1,798 Total $ (1,798 ) $ 1,798
Summary of Effect of Cash Flow Hedges on the Accompanying Consolidated Statements of Operations and Comprehensive Income	The following tables provide a summary of the effect of cash flow hedges on the Company’s accompanying consolidated statements of operations and comprehensive income for the years ended December 31, 2018, 2017 and 2016, respectively (amounts in thousands): Effective Portion Ineffective Portion December 31, 2018 Type of Cash Flow Hedge Amount of Gain/(Loss) Recognized in OCI on Derivative Location of Gain/(Loss) Reclassified from Accumulated OCI into Income Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income Location of Gain/(Loss) Recognized in Income on Derivative Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps $ 5,124 Interest expense $ (18,452 ) Interest expense $ — Total $ 5,124 $ (18,452 ) $ — Effective Portion Ineffective Portion December 31, 2017 Type of Cash Flow Hedge Amount of Gain/(Loss) Recognized in OCI on Derivative Location of Gain/(Loss) Reclassified from Accumulated OCI into Income Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income Location of Gain/(Loss) Recognized in Income on Derivative Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps $ 6,439 Interest expense $ (18,858 ) Interest expense $ — Total $ 6,439 $ (18,858 ) $ — Effective Portion Ineffective Portion December 31, 2016 Type of Cash Flow Hedge Amount of Gain/(Loss) Recognized in OCI on Derivative Location of Gain/(Loss) Reclassified from Accumulated OCI into Income Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income Location of Gain/(Loss) Recognized in Income on Derivative Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps $ (3,989 ) Interest expense $ (41,758 ) Interest expense $ (74 ) Total $ (3,989 ) $ (41,758 ) $ (74 )

Earnings Per Share and Earnin_2

Earnings Per Share and Earnings Per Unit (Tables)	12 Months Ended
	Dec. 31, 2018
Schedule of Calculation of Numerator and Denominator in Earnings Per Share and Earnings Per Unit	The following tables set forth the computation of net income per share – basic and net income per share – diluted for the Company (amounts in thousands except per share amounts): Year Ended December 31, 2018 2017 2016 Numerator for net income per share – basic: Income from continuing operations $ 685,192 $ 628,381 $ 4,479,586 Allocation to Noncontrolling Interests – Operating Partnership, net (24,939 ) (22,604 ) (171,491 ) Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (2,718 ) (2,323 ) (16,430 ) Preferred distributions (3,090 ) (3,091 ) (3,091 ) Income from continuing operations available to Common Shares, net of Noncontrolling Interests 654,445 600,363 4,288,574 Discontinued operations, net of Noncontrolling Interests — — 498 Numerator for net income per share – basic $ 654,445 $ 600,363 $ 4,289,072 Numerator for net income per share – diluted: Income from continuing operations $ 685,192 $ 628,381 $ 4,479,586 Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (2,718 ) (2,323 ) (16,430 ) Preferred distributions (3,090 ) (3,091 ) (3,091 ) Income from continuing operations available to Common Shares 679,384 622,967 4,460,065 Discontinued operations, net — — 518 Numerator for net income per share – diluted $ 679,384 $ 622,967 $ 4,460,583 Denominator for net income per share – basic and diluted: Denominator for net income per share – basic 368,052 366,968 365,002 Effect of dilutive securities: OP Units 12,869 12,901 13,827 Long-term compensation shares/units 2,774 2,809 3,163 Denominator for net income per share – diluted 383,695 382,678 381,992 Net income per share – basic $ 1.78 $ 1.64 $ 11.75 Net income per share – diluted $ 1.77 $ 1.63 $ 11.68 Net income per share – basic: Income from continuing operations available to Common Shares, net of Noncontrolling Interests $ 1.78 $ 1.64 $ 11.75 Discontinued operations, net of Noncontrolling Interests — — — Net income per share – basic $ 1.78 $ 1.64 $ 11.75 Net income per share – diluted: Income from continuing operations available to Common Shares $ 1.77 $ 1.63 $ 11.68 Discontinued operations, net — — — Net income per share – diluted $ 1.77 $ 1.63 $ 11.68 Distributions declared per Common Share outstanding $ 2.16 $ 2.015 $ 13.015
ERPOP [Member]
Schedule of Calculation of Numerator and Denominator in Earnings Per Share and Earnings Per Unit	The following tables set forth the computation of net income per Unit – basic and net income per Unit – diluted for the Operating Partnership (amounts in thousands except per Unit amounts): Year Ended December 31, 2018 2017 2016 Numerator for net income per Unit – basic and diluted: Income from continuing operations $ 685,192 $ 628,381 $ 4,479,586 Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (2,718 ) (2,323 ) (16,430 ) Allocation to Preference Units (3,090 ) (3,091 ) (3,091 ) Income from continuing operations available to Units 679,384 622,967 4,460,065 Discontinued operations, net — — 518 Numerator for net income per Unit – basic and diluted $ 679,384 $ 622,967 $ 4,460,583 Denominator for net income per Unit – basic and diluted: Denominator for net income per Unit – basic 380,921 379,869 378,829 Effect of dilutive securities: Dilution for Units issuable upon assumed exercise/vesting of the Company’s long-term compensation shares/units 2,774 2,809 3,163 Denominator for net income per Unit – diluted 383,695 382,678 381,992 Net income per Unit – basic $ 1.78 $ 1.64 $ 11.75 Net income per Unit – diluted $ 1.77 $ 1.63 $ 11.68 Net income per Unit – basic: Income from continuing operations available to Units $ 1.78 $ 1.64 $ 11.75 Discontinued operations, net — — — Net income per Unit – basic $ 1.78 $ 1.64 $ 11.75 Net income per Unit – diluted: Income from continuing operations available to Units $ 1.77 $ 1.63 $ 11.68 Discontinued operations, net — — — Net income per Unit – diluted $ 1.77 $ 1.63 $ 11.68 Distributions declared per Unit outstanding $ 2.16 $ 2.015 $ 13.015

Individually Significant Disp_2

Individually Significant Dispositions (Tables)	12 Months Ended
	Dec. 31, 2018
Starwood Portfolio [Member] | Disposal Group, Not Discontinued Operations [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Schedule of Results of Operations Attributable to Starwood Transaction	As a result, the following table summarizes the results of operations attributable to the Starwood Transaction for the year ended December 31, 2016 (amounts in thousands): Year Ended December 31, 2016 REVENUES Rental income $ 30,785 Total revenues 30,785 EXPENSES Property and maintenance 7,838 Real estate taxes and insurance 2,912 Property management 2 General and administrative 23 Depreciation — Total expenses 10,775 Operating income 20,010 Interest and other income 21 Other expenses — Interest: Expense incurred, net (380 ) Amortization of deferred financing costs (707 ) Income and other tax (expense) benefit (1 ) Net gain (loss) on sales of real estate properties 3,161,097 Income from operations attributable to controlling interests – Operating Partnership 3,180,040 Income from operations attributable to Noncontrolling Interests – Operating Partnership (122,152 ) Income from operations attributable to controlling interests – Company $ 3,057,888

Share Incentive Plans (Tables)

Share Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Share Based Compensation [Abstract]
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan	The following tables summarize compensation information regarding the restricted shares, restricted units, share options and Employee Share Purchase Plan (“ESPP”) for the three years ended December 31, 2018, 2017 and 2016 (amounts in thousands): Year Ended December 31, 2018 Compensation Expense Compensation Capitalized Restricted Units/Options In-Lieu of Bonus (1) Compensation Equity Dividends Incurred Restricted shares (2) $ 7,406 $ 852 $ — $ 8,258 $ 754 Restricted units (2) 12,310 36 1,663 14,009 963 Share options 6,683 296 2,755 9,734 — ESPP discount 733 34 — 767 — Total $ 27,132 $ 1,218 $ 4,418 $ 32,768 $ 1,717 Year Ended December 31, 2017 Compensation Expense Compensation Capitalized Restricted Units/Options In-Lieu of Bonus (1) Compensation Equity Dividends Incurred Restricted shares (2) $ 9,209 $ 568 $ — $ 9,777 $ 761 Restricted units (2) 10,214 119 190 10,523 741 Share options 4,893 323 1,619 6,835 — ESPP discount 681 66 — 747 — Total $ 24,997 $ 1,076 $ 1,809 $ 27,882 $ 1,502 Year Ended December 31, 2016 Compensation Expense Compensation Capitalized Restricted Units In-Lieu of Bonus (1) Compensation Equity Dividends Incurred Restricted shares (2) $ 13,539 $ 1,477 $ — $ 15,016 $ 6,494 Restricted units (2) 13,567 591 4,022 18,180 7,762 Share options 2,839 593 — 3,432 — ESPP discount 585 65 — 650 — Total $ 30,530 $ 2,726 $ 4,022 $ 37,278 $ 14,256 (1) The Company allows officers the ability to receive immediately vested restricted units (subject to the book-up provisions described above and a two-year hold restriction) in-lieu of any percentage of their annual cash bonus. Beginning in 2017, the Company allows eligible employees the ability to receive immediately vested share options in-lieu of any percentage of their annual cash bonus. (2) Includes LTI plan awards granted under the executive compensation program.
Award Activity of the Share Incentive Plans	The table below summarizes the Award activity of the Share Incentive Plans for the three years ended December 31, 2018, 2017 and 2016: Common Shares Subject to Options Weighted Average Exercise Price per Option Restricted Shares Weighted Average Fair Value per Restricted Share Restricted Units Weighted Average Fair Value per Restricted Unit Balance at December 31, 2015 5,734,365 $ 48.04 522,150 $ 63.67 888,725 $ 63.91 Awards granted (1) (5) 154,016 $ 64.99 154,296 $ 75.19 289,273 $ 81.05 Awards exercised/vested (2) (3) (4) (815,044 ) $ 38.01 (217,805 ) $ 57.75 (374,217 ) $ 52.73 Awards forfeited (10,512 ) $ 63.43 (6,607 ) $ 70.73 (1,524 ) $ 86.35 Awards expired (710 ) $ 68.40 — — — — Special dividend adjustment (6) 960,986 N/A — — — — Balance at December 31, 2016 6,023,101 $ 42.05 452,034 $ 70.35 802,257 $ 75.26 Awards granted (1) (5) 1,337,898 $ 60.88 93,867 $ 61.94 291,921 $ 68.57 Awards exercised/vested (2) (3) (4) (846,137 ) $ 37.26 (165,744 ) $ 58.04 (192,644 ) $ 54.16 Awards forfeited (27,547 ) $ 61.85 (10,416 ) $ 72.44 (274 ) $ 75.50 Awards expired (3,483 ) $ 65.91 — — — — Balance at December 31, 2017 6,483,832 $ 46.46 369,741 $ 73.67 901,260 $ 77.61 Awards granted (1) (5) 1,730,942 $ 60.40 129,303 $ 62.25 267,074 $ 61.60 Awards exercised/vested (2) (3) (4) (1,056,388 ) $ 29.05 (194,116 ) $ 77.32 (28,486 ) $ 55.50 Awards forfeited (38,133 ) $ 60.74 (5,503 ) $ 65.77 — $ — Awards expired (8,018 ) $ 59.70 — — — — Balance at December 31, 2018 7,112,235 $ 52.35 299,425 $ 66.52 1,139,848 $ 71.07 (1) The weighted average grant date fair value for Options granted during the years ended December 31, 2018, 2017 and 2016 was $6.17 per share, $5.86 per share and $11.09 per share, respectively. (2) The aggregate intrinsic value of options exercised during the years ended December 31, 2018, 2017 and 2016 was $42.9 million, $25.6 million and $26.2 million, respectively. These values were calculated as the difference between the strike price of the underlying awards and the per share price at which each respective award was exercised. (3) The fair value of restricted shares vested during the years ended December 31, 2018, 2017 and 2016 was $11.5 million, $10.2 million and $15.6 million, respectively. (4) The fair value of restricted units vested during the years ended December 31, 2018, 2017 and 2016 was $1.8 million, $11.7 million and $27.2 million, respectively. (5) Includes LTI plan awards granted under the executive compensation program. (6) In addition to the regular quarterly dividends, the Company paid two special dividends to its shareholders and holders of OP Units of $11.00 per share/unit in the aggregate in 2016. Option holders were not entitled to these special dividends, but pursuant to the terms of the Share Incentive Plans are due equitable adjustments of additional options. The special dividend adjustment’s weighted average exercise price per option is reflected in the activity for 2016 for the awards granted, awards exercised/vested, and awards forfeited and the balance at December 31, 2016.
Information Regarding Options Outstanding and Exercisable	The following table summarizes information regarding options outstanding and exercisable at December 31, 2018 (aggregate intrinsic value is in thousands): Options Weighted Average Remaining Contractual Life in Years Weighted Average Exercise Price Aggregate Intrinsic Value (1) Options Outstanding 7,112,235 5.58 $ 52.35 $ 97,633 Options Exercisable 5,328,020 4.52 $ 49.57 $ 88,031 Vested and expected to vest 7,096,243 5.57 $ 52.33 $ 97,543 (1) The aggregate intrinsic values were calculated as the excess, if any, between the Company’s closing share price of $66.01 per share on December 31, 2018 and the strike price of the underlying awards.

Employee Plans (Tables)

Employee Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Employee Service Share Based Compensation Aggregate Disclosures [Abstract]
Summary of Information Regarding the Common Shares Issued Under the ESPP	The following table summarizes information regarding the Common Shares issued under the ESPP (the net proceeds noted below were contributed to ERPOP in exchange for OP Units): Year Ended December 31, 2018 2017 2016 (Amounts in thousands except share and per share amounts) Shares issued 75,414 68,286 63,909 Issuance price ranges $47.80 – $57.09 $52.79 – $58.06 $51.85 – $63.37 Issuance proceeds $3,879 $3,744 $3,686

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Schedule of Contractual Obligations	The following table summarizes the Company’s contractual obligations for minimum rent payments under operating leases and deferred compensation for the next five years and thereafter as of December 31, 2018: (Payments)/Receipts Due by Year (in thousands) 2019 2020 2021 2022 2023 Thereafter Total Operating Leases: Minimum Rent Payments (a) $ (16,718 ) $ (16,726 ) $ (16,665 ) $ (14,500 ) $ (14,339 ) $ (953,001 ) $ (1,031,949 ) Minimum Rent Receipts (b) $ 64,790 $ 61,409 $ 57,326 $ 53,193 $ 46,016 $ 172,694 $ 455,428 Other Long-Term Liabilities: Deferred Compensation (c) $ (803 ) $ (1,100 ) $ (1,100 ) $ (1,100 ) $ (975 ) $ (3,810 ) $ (8,888 ) (a) Minimum basic rent due for various office space the Company leases and fixed base rent due on ground leases for 12 properties. (b) Minimum basic rent receipts due for various retail/commercial space where the Company is the lessor. (c) Estimated payments to the Company’s Chairman, Vice Chairman and one former CEO based on actual and estimated retirement dates.

Reportable Segments (Tables)

Reportable Segments (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Schedule of Reconciliation of NOI from Rental Real Estate Specific to Continuing Operations	The following table presents a reconciliation of NOI from our rental real estate specific to continuing operations for the years ended December 31, 2018, 2017 and 2016, respectively (amounts in thousands): Year Ended December 31, 2018 2017 2016 Rental income $ 2,577,681 $ 2,470,689 $ 2,422,233 Property and maintenance expense (429,335 ) (405,281 ) (406,823 ) Real estate taxes and insurance expense (357,814 ) (335,495 ) (317,387 ) Total operating expenses (787,149 ) (740,776 ) (724,210 ) Net operating income $ 1,790,532 $ 1,729,913 $ 1,698,023
Schedule of NOI for Each Segment from Rental Real Estate Specific to Continuing Operations	The following tables present NOI for each segment from our rental real estate specific to continuing operations for the years ended December 31, 2018, 2017 and 2016, respectively, as well as total assets and capital expenditures at December 31, 2018 and 2017, respectively (amounts in thousands): Year Ended December 31, 2018 Year Ended December 31, 2017 Year Ended December 31, 2016 Rental Income Operating Expenses NOI Rental Income Operating Expenses NOI Rental Income Operating Expenses NOI Same store (1) Los Angeles $ 416,688 $ 119,473 $ 297,215 $ 402,192 $ 114,055 $ 288,137 $ 382,425 $ 111,055 $ 271,370 Orange County 91,650 22,071 69,579 88,527 21,544 66,983 84,590 20,600 63,990 San Diego 91,971 24,023 67,948 88,507 23,073 65,434 84,646 22,366 62,280 Subtotal - Southern California 600,309 165,567 434,742 579,226 158,672 420,554 551,661 154,021 397,640 San Francisco 442,773 105,686 337,087 430,501 108,689 321,812 371,633 90,393 281,240 Washington D.C. 434,545 134,427 300,118 430,060 129,720 300,340 424,350 126,154 298,196 New York 458,366 181,040 277,326 454,945 170,064 284,881 456,664 159,302 297,362 Boston 229,079 63,348 165,731 223,595 60,931 162,664 225,014 62,650 162,364 Seattle 196,479 55,165 141,314 191,074 52,470 138,604 168,975 46,255 122,720 Other Markets 1,940 657 1,283 1,839 652 1,187 1,797 567 1,230 Total same store 2,363,491 705,890 1,657,601 2,311,240 681,198 1,630,042 2,200,094 639,342 1,560,752 Non-same store/other (2) (3) Non-same store 190,814 63,907 126,907 95,016 30,742 64,274 117,143 41,877 75,266 Other (3) 23,376 17,352 6,024 64,433 28,836 35,597 104,996 42,991 62,005 Total non-same store/other 214,190 81,259 132,931 159,449 59,578 99,871 222,139 84,868 137,271 Totals $ 2,577,681 $ 787,149 $ 1,790,532 $ 2,470,689 $ 740,776 $ 1,729,913 $ 2,422,233 $ 724,210 $ 1,698,023 (1) For the years ended December 31, 2018 and 2017, same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2017, less properties subsequently sold, which represented 71,721 apartment units. For the year ended December 31, 2016, same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2016, less properties subsequently sold, which represented 70,117 apartment units. (2) For the years ended December 31, 2018 and 2017, non-same store primarily includes properties acquired after January 1, 2017, plus any properties in lease-up and not stabilized as of January 1, 2017. For the year ended December 31, 2016, non-same store primarily includes properties acquired after January 1, 2016, plus any properties in lease-up and not stabilized as of January 1, 2016. (3) Other includes development, other corporate operations and operations prior to disposition for properties sold. Year Ended December 31, 2018 Year Ended December 31, 2017 Total Assets Capital Expenditures Total Assets Capital Expenditures Same store (1) Los Angeles $ 2,608,347 $ 28,306 $ 2,692,602 $ 26,921 Orange County 318,472 8,192 328,593 9,237 San Diego 405,449 4,525 421,267 4,922 Subtotal - Southern California 3,332,268 41,023 3,442,462 41,080 San Francisco 2,967,735 44,837 3,039,552 38,618 Washington D.C. 3,702,368 29,616 3,803,185 35,423 New York 4,063,568 23,472 4,160,603 30,403 Boston 1,589,000 24,623 1,636,925 28,687 Seattle 1,277,865 17,825 1,316,678 21,646 Other Markets 12,781 163 12,768 103 Total same store 16,945,585 181,559 17,412,173 195,960 Non-same store/other (2) (3) Non-same store 2,940,770 6,665 2,276,312 3,704 Other (3) 507,854 277 882,114 2,943 Total non-same store/other 3,448,624 6,942 3,158,426 6,647 Totals $ 20,394,209 $ 188,501 $ 20,570,599 $ 202,607 (1) Same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2017, less properties subsequently sold, which represented 71,721 apartment units. (2) Non-same store primarily includes properties acquired after January 1, 2017, plus any properties in lease-up and not stabilized as of January 1, 2017. (3) Other includes development, other corporate operations and capital expenditures for properties sold.

Quarterly Financial Data (Una_2

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Data [Line Items]
Schedule of Quarterly Financial Information	The following unaudited quarterly data has been prepared on the basis of a December 31 year-end. Amounts are in thousands, except for per share amounts. First Quarter Second Quarter Third Quarter Fourth Quarter 2018 3/31 6/30 9/30 12/31 Total revenues $ 633,016 $ 639,808 $ 652,867 $ 652,743 Operating income 196,869 217,654 224,731 219,306 Net income * 220,548 118,410 223,846 122,388 Net income available to Common Shares 211,036 112,830 214,164 116,415 Earnings per share – basic: Net income available to Common Shares $ 0.57 $ 0.31 $ 0.58 $ 0.32 Weighted average Common Shares outstanding 367,800 367,930 368,028 368,445 Earnings per share – diluted: Net income available to Common Shares $ 0.57 $ 0.31 $ 0.58 $ 0.31 Weighted average Common Shares outstanding 383,018 383,423 383,884 384,296 First Quarter Second Quarter Third Quarter Fourth Quarter 2017 3/31 6/30 9/30 12/31 Total revenues $ 604,100 $ 612,480 $ 624,122 $ 630,704 Operating income 204,371 210,550 217,786 214,764 Net income * 149,941 204,160 144,196 130,084 Net income available to Common Shares 142,969 195,268 137,457 124,669 Earnings per share – basic: Net income available to Common Shares $ 0.39 $ 0.53 $ 0.37 $ 0.34 Weighted average Common Shares outstanding 366,605 366,820 366,996 367,442 Earnings per share – diluted: Net income available to Common Shares $ 0.39 $ 0.53 $ 0.37 $ 0.34 Weighted average Common Shares outstanding 382,280 382,692 382,945 383,105 * The Company did not have any discontinued operations, extraordinary items or cumulative effect of change in accounting principle during the years ended December 31, 2018 and 2017. Therefore, income from continuing operations and income before extraordinary items and cumulative effect of change in accounting principle are not shown as they were both equal to the net income amounts disclosed above.
ERPOP [Member]
Quarterly Financial Data [Line Items]
Schedule of Quarterly Financial Information	The following unaudited quarterly data has been prepared on the basis of a December 31 year-end. Amounts are in thousands, except for per Unit amounts. First Quarter Second Quarter Third Quarter Fourth Quarter 2018 3/31 6/30 9/30 12/31 Total revenues $ 633,016 $ 639,808 $ 652,867 $ 652,743 Operating income 196,869 217,654 224,731 219,306 Net income * 220,548 118,410 223,846 122,388 Net income available to Units 219,095 117,129 222,323 120,837 Earnings per Unit – basic: Net income available to Units $ 0.57 $ 0.31 $ 0.58 $ 0.32 Weighted average Units outstanding 380,663 380,795 380,912 381,306 Earnings per Unit – diluted: Net income available to Units $ 0.57 $ 0.31 $ 0.58 $ 0.31 Weighted average Units outstanding 383,018 383,423 383,884 384,296 First Quarter Second Quarter Third Quarter Fourth Quarter 2017 3/31 6/30 9/30 12/31 Total revenues $ 604,100 $ 612,480 $ 624,122 $ 630,704 Operating income 204,371 210,550 217,786 214,764 Net income * 149,941 204,160 144,196 130,084 Net income available to Units 148,380 202,622 142,623 129,342 Earnings per Unit – basic: Net income available to Units $ 0.39 $ 0.53 $ 0.37 $ 0.34 Weighted average Units outstanding 379,504 379,733 379,906 380,325 Earnings per Unit – diluted: Net income available to Units $ 0.39 $ 0.53 $ 0.37 $ 0.34 Weighted average Units outstanding 382,280 382,692 382,945 383,105 * The Operating Partnership did not have any discontinued operations, extraordinary items or cumulative effect of change in accounting principle during the years ended December 31, 2018 and 2017. Therefore, income from continuing operations and income before extraordinary items and cumulative effect of change in accounting principle are not shown as they were both equal to the net income amounts disclosed above.

Business - Additional Informati

Business - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018StatePropertyApartmentUnit	Apr. 02, 2018ApartmentUnit	Feb. 01, 2018ApartmentUnit
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Number of states in which entity operates | State	11
Properties | Property	307
Apartment units	79,482
Number of operating properties under long-term ground leases | Property	14
Minimum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Long term ground lease expiration period	2,042
Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Long term ground lease expiration period	2,113
Master-Leased Properties – Consolidated | Boston
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Number of self managed apartments			94
Master-Leased Properties – Consolidated | Los Angeles
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Number of self managed apartments		597
ERPOP [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Noncontrolling interest, ownership percentage by parent	96.40%

Business - Ownership Breakdown

Business - Ownership Breakdown (Details)	Dec. 31, 2018PropertyApartmentUnit
Property/Unit schedule
Properties | Property	307
Apartment Units | ApartmentUnit	79,482
Wholly Owned Properties
Property/Unit schedule
Properties | Property	287
Apartment Units | ApartmentUnit	74,840
Master-Leased Property – Consolidated
Property/Unit schedule
Properties | Property	1
Apartment Units | ApartmentUnit	162
Partially Owned Properties – Consolidated
Property/Unit schedule
Properties | Property	17
Apartment Units | ApartmentUnit	3,535
Partially Owned Properties – Unconsolidated
Property/Unit schedule
Properties | Property	2
Apartment Units | ApartmentUnit	945

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018USD ($)PropertyApartmentUnit$ / shares	Dec. 31, 2017USD ($)$ / shares	Dec. 31, 2016USD ($)$ / shares
Value of furniture and fixtures minimum range	$ 10,000
Value of furniture and fixtures maximum range	$ 35,000
Lease intangibles, average term	6 months
Capitalized costs development and renovation	$ 13,200,000	$ 14,700,000	$ 18,700,000
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.01	$ 0.01	$ 0.01
Land and depreciable property net	$ 14,000,000,000	$ 14,800,000,000
Discount rate description	The discount rates were determined using the Company’s borrowing rates (actual pricing through 30 years and other long-term market rates).
Percentage of rental income excluded from accounting standard adoption	94.00%
Percentage of total revenue subject to revenue recognition standard	6.00%
Properties | Property	307
Noncontrolling Interests – Partially Owned Properties	$ (2,293,000)	$ 4,708,000
Apartment units | ApartmentUnit	79,482
Partially Owned Properties – Consolidated
Properties | Property	17
Noncontrolling Interests – Partially Owned Properties	$ 2,300,000
Apartment units | ApartmentUnit	3,535
Limited Life Partnership Properties [Member]
Properties | Property	4
Noncontrolling Interests – Partially Owned Properties	$ 9,600,000
Noncontrolling interests settlement value	70,400,000
Accounting Standards Update 2016-02 [Member]
Expected right of use assets and related lease liabilities to opening balance sheet adoption of new accounting standard on leases	$ 300,000,000
Minimum [Member] | Retail Commercial Leases [Member]
Retail/commercial leases term	5 years
Minimum [Member] | Corporate Office Leases [Member]
Discount rate	3.30%
Minimum [Member] | Ground Leases [Member]
Discount rate	4.40%
Maximum [Member] | Retail Commercial Leases [Member]
Retail/commercial leases term	10 years
Maximum [Member] | Corporate Office Leases [Member]
Discount rate	3.90%
Maximum [Member] | Ground Leases [Member]
Discount rate	5.50%
Furniture and Fixtures [Member] | Minimum [Member]
Property, plant and equipment, estimated useful lives	5 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, plant and equipment, estimated useful lives	10 years
Building [Member]
Property, plant and equipment, estimated useful lives	30 years
Building Improvements [Member]
Property, plant and equipment, estimated useful lives	8 years
Replacements [Member] | Minimum [Member]
Property, plant and equipment, estimated useful lives	5 years
Replacements [Member] | Maximum [Member]
Property, plant and equipment, estimated useful lives	10 years
Renovations and Improvements Minimum [Member] | Minimum [Member]
Property, plant and equipment, estimated useful lives	5 years
Renovations and Improvements Minimum [Member] | Maximum [Member]
Property, plant and equipment, estimated useful lives	15 years

Summary of Significant Accoun_5

Summary of Significant Accounting Policies Compensation (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary Of Significant Accounting Policies [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	14.80%	15.30%	26.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	5 years	5 years	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	3.09%	3.08%	3.04%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.52%	1.93%	1.27%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 6.15	$ 5.86	$ 13.02

Summary of Significant Accoun_6

Summary of Significant Accounting Policies Compensation (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2018
Summary Of Significant Accounting Policies [Abstract]
Historical period to estimate volatility	5 years
Historical volatility period basis	10 years

Summary of Significant Accoun_7

Summary of Significant Accounting Policies Tax (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income and other tax expense (benefit)	$ 878	$ 478	$ 1,613
Tax Treatment Of Dividends And Distributions Ordinary Dividends	$ 1.84454	$ 1.22126	$ 0.722
Tax Treatment Of Dividends And Distributions Long Term Capital Gain	0.21423	0.18959	9.176
Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain	0.06498	0.10040	3.117
Dividends and distributions declared per Common Share outstanding	$ 2.12375	$ 1.51125	$ 13.015
Income, Franchise, and Exise Taxes [Member]
Income and other tax expense (benefit)	$ 878	$ 478	$ 1,613
Discontinued operations, net			12
Provision for income, franchise and excise taxes	$ 878	$ 478	$ 1,625

Summary of Significant Accoun_8

Summary of Significant Accounting Policies Tax (Parenthetical) (Details) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Disclosure Summary Of Significant Accounting Policies Tax Parenthetical Details [Abstract]
Dividend payable common share/unit, per share	$ 0.54	$ 0.50375

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue Streams of Rental Income and Percentage of Rental Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amount of rental income	$ 2,577,681	$ 2,470,689	$ 2,422,233
Percentage of Rental Income	100.00%
Amount of rental income	$ 2,418,168
Leasing Revenue [Member]
Percentage of Rental Income	93.80%
Utility Recoveries [Member]
Amount of Rental Income	$ 63,218
Percentage of Rental Income	2.50%
Parking Revenue [Member]
Amount of Rental Income	$ 26,743
Percentage of Rental Income	1.00%
Other Revenue [Member]
Amount of Rental Income	$ 69,552
Percentage of Rental Income	2.70%

Equity, Capital and Other Int_3

Equity, Capital and Other Interests - Changes in Issued and Outstanding Common Shares and Units (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity Capital And Other Interests [Abstract]
Common Stock, Shares, Outstanding	368,018,082	365,870,924	364,755,444
Common Shares Issued:
Conversion of OP Units	131,477	1,149,284	88,838
Exercise of share options	1,056,388	846,137	815,044
Employee Share Purchase Plan (ESPP)	75,414	68,286	63,909
Restricted share grants, net	123,800	83,451	147,689
Common Stock, Shares, Outstanding	369,405,161	368,018,082	365,870,924
Units
Total Units Outstanding	13,768,438	14,626,075	14,427,164
Restricted unit grants, net	267,074	291,647	287,749
Conversion of OP Units to Common Shares	(131,477)	(1,149,284)	(88,838)
Total Units Outstanding	13,904,035	13,768,438	14,626,075
Common Shares And Units Outstanding	383,309,196	381,786,520	380,496,999
Units Ownership Interest in Operating Partnership	3.60%	3.60%	3.80%

Equity, Capital and Other Int_4

Equity, Capital and Other Interests - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Class Of Stock [Line Items]
Redeemable noncontrolling interests - operating partnership	$ 379,106	$ 366,955	$ 442,092	$ 566,783
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, par or stated value per share	$ 0.01	$ 0.01
ERPOP [Member]
Class Of Stock [Line Items]
Redeemable Limited Partners	$ 379,106	$ 366,955	$ 442,092	$ 566,783

Equity, Capital and Other Int_5

Equity, Capital and Other Interests - Changes in Redemption Value of Redeemable Noncontrolling Interests - Operating Partnership (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity Capital And Other Interests [Abstract]
Redeemable Noncontrolling Interests - Operating Partnership	$ 366,955	$ 442,092	$ 566,783
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership	13,922	(41,916)	(115,093)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	(1,771)	(33,221)	(9,598)
Redeemable Noncontrolling Interests - Operating Partnership	$ 379,106	$ 366,955	$ 442,092

Equity, Capital and Other Int_6

Equity, Capital and Other Interests - Issued and Outstanding Preferred Shares and Preference Units (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Class Of Stock [Line Items]
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 745,600 shares issued and outstanding as of December 31, 2018 and 2017	$ 37,280	$ 37,280
ERPOP [Member]
Class Of Stock [Line Items]
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 745,600 shares issued and outstanding as of December 31, 2018 and 2017	$ 37,280	37,280
Preferred Stock
Class Of Stock [Line Items]
Preferred Stocks Preference Units Call Date	Dec. 10, 2026
Annual Dividend Per Preferred Share Preference Unit	$ 4.145
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 745,600 shares issued and outstanding as of December 31, 2018 and 2017	$ 37,280	37,280
Preferred Stock | ERPOP [Member]
Class Of Stock [Line Items]
Preferred Stocks Preference Units Call Date	Dec. 10, 2026
Annual Dividend Per Preferred Share Preference Unit	$ 4,145
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 745,600 shares issued and outstanding as of December 31, 2018 and 2017	$ 37,280	$ 37,280

Equity, Capital and Other Int_7

Equity, Capital and Other Interests - Issued and Outstanding Preferred Shares and Preference Units (Parenthetical) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Class Of Stock [Line Items]
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	100,000,000	100,000,000
Preferred Stock
Class Of Stock [Line Items]
Preferred Stock Preference Units Issued	745,600	745,600
Preferred Stock Preference Units Outstanding	745,600	745,600
Preferred Stock Preference Units Redemption Price Per Share	$ 50	$ 50
Preferred Stock Preference Units Dividend Rate Percentage	8.29%	8.29%
Preferred Stock | ERPOP [Member]
Class Of Stock [Line Items]
Preferred Stock Preference Units Issued	745,600	745,600
Preferred Stock Preference Units Outstanding	745,600	745,600
Preferred Stock Preference Units Redemption Price Per Share	$ 50	$ 50
Preferred Stock Preference Units Dividend Rate Percentage	8.29%	8.29%

Equity, Capital and Other Int_8

Equity, Capital and Other Interests - Changes in Operating Partnership's Issued and Outstanding Units (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
General and Limited Partner Units
Common Shares And Units Outstanding	381,786,520	380,496,999
Exercise of share options	1,056,388	846,137	815,044
Employee Share Purchase Plan (ESPP)	75,414	68,286	63,909
Restricted share grants, net	123,800	83,451	147,689
Restricted unit grants, net	267,074	291,647	287,749
Common Shares And Units Outstanding	383,309,196	381,786,520	380,496,999
LIMITED PARTNERS
Total Units Outstanding	13,768,438	14,626,075	14,427,164
Restricted unit grants, net	267,074	291,647	287,749
Conversion of Limited Partner OP Units to EQR Common Shares	(131,477)	(1,149,284)	(88,838)
Total Units Outstanding	13,904,035	13,768,438	14,626,075
Units Ownership Interest in Operating Partnership	3.60%	3.60%	3.80%
ERPOP [Member]
General and Limited Partner Units
Common Shares And Units Outstanding	381,786,520	380,496,999	379,182,608
Exercise of share options	1,056,388	846,137	815,044
Employee Share Purchase Plan (ESPP)	75,414	68,286	63,909
Restricted share grants, net	123,800	83,451	147,689
Restricted unit grants, net	267,074	291,647	287,749
Common Shares And Units Outstanding	383,309,196	381,786,520	380,496,999
LIMITED PARTNERS
Total Units Outstanding	13,768,438	14,626,075	14,427,164
Restricted unit grants, net	267,074	291,647	287,749
Conversion of Limited Partner OP Units to EQR Common Shares	(131,477)	(1,149,284)	(88,838)
Total Units Outstanding	13,904,035	13,768,438	14,626,075
Units Ownership Interest in Operating Partnership	3.60%	3.60%	3.80%

Equity, Capital and Other Int_9

Equity, Capital and Other Interests - Changes in Redemption Value of Redeemable Limited Partners Interest (Details) - ERPOP [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Redeemable Limited Partners	$ 366,955	$ 442,092	$ 566,783
Limited Partners Change In Redemption Value	13,922	(41,916)	(115,093)
Limited Partners Change In Carrying Value	(1,771)	(33,221)	(9,598)
Redeemable Limited Partners	$ 379,106	$ 366,955	$ 442,092

Equity, Capital and Other In_10

Equity, Capital and Other Interests - Other - Additional Information (Details)	59 Months Ended	132 Months Ended
	Dec. 31, 2018shares	Dec. 31, 2018shares
Equity Capital And Other Interests [Abstract]
Additional common shares authorized	13,000,000	13,000,000
Stock repurchase program, number of shares authorized to be repurchased	13,000,000	13,000,000
Stock open market repurchased and retired during period, shares	0	0
Stock repurchase program, remaining number of shares authorized to be repurchased	13,000,000	13,000,000

Real Estate and Lease Intangi_3

Real Estate and Lease Intangibles - Summary of Carrying Amounts of Investment in Real Estate (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Land	$ 5,875,803	$ 5,996,024
Depreciable property:
Buildings and improvements	18,232,625	17,743,042
Furniture, fixtures and equipment	1,722,231	1,548,961
In-Place lease intangibles	481,045	476,359
Projects under development:
Construction-in-progress	109,409	163,547
Land held for development:
Land	89,909	98,963
Construction-in-progress	109,409	163,547
Investment in real estate	26,511,022	26,026,896
Accumulated depreciation	(6,696,281)	(6,040,378)
Investment in real estate, net	19,814,741	19,986,518
Projects under development [Member]
Projects under development:
Land	25,429	43,226
Construction-in-progress	83,980	120,321
Land held for development:
Construction-in-progress	83,980	120,321
Land held for development [Member]
Projects under development:
Construction-in-progress	28,871	36,425
Land held for development:
Land	61,038	62,538
Construction-in-progress	$ 28,871	$ 36,425

Real Estate and Lease Intangi_4

Real Estate and Lease Intangibles - Summary of Carrying Amounts of Above and Below Market Ground And Retail Lease Intangibles (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Assets [Member]
Lease intangible assets	$ 193,178	$ 193,178
Finite-Lived Intangible Assets, Accumulated Amortization	(26,947)	(22,434)
Lease intangible assets, net	166,231	170,744
Other Assets [Member] | Ground Leases [Member]
Finite-Lived Intangible Asset, Off-market Lease, Favorable, Gross	191,918	191,918
Other Assets [Member] | Retail Lease [Member]
Finite-Lived Intangible Asset, Off-market Lease, Favorable, Gross	1,260	1,260
Other Liabilities [Member]
Lease Intangible Liabilities	4,110	7,670
Finite Lived Intangible Liabilities Accumulated Amortization	(1,704)	(5,143)
Lease intangible liabilities, net	2,406	2,527
Other Liabilities [Member] | Ground Leases [Member]
Finite-Lived Intangible Liabilities, Off-market Lease, Unfavorable, Gross	2,400	2,400
Other Liabilities [Member] | Retail Lease [Member]
Finite-Lived Intangible Liabilities, Off-market Lease, Unfavorable, Gross	$ 1,710	$ 5,270

Real Estate and Lease Intangi_5

Real Estate and Lease Intangibles - Summary of the Effect of the Amortization for Above and Below Market Ground and Retail Lease Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Total amortization of above/below market lease intangibles	$ (4,392)	$ (3,828)	$ (3,426)
Ground Leases [Member] | Property and Maintenance [Member]
Total amortization of above/below market lease intangibles	(4,463)	(4,369)	(4,321)
Retail Lease [Member] | Rental Income [Member]
Total amortization of above/below market lease intangibles	$ 71	$ 541	$ 895

Real Estate and Lease Intangi_6

Real Estate and Lease Intangibles - Summary of Aggregate Amortization for Above and Below Market Ground And Retail Lease Intangibles (Details) $ in Thousands	Dec. 31, 2018USD ($)
Finite-lived intangible assets, amortization expense, year 2019	$ (4,392)
Finite-lived intangible assets, amortization expense, year 2020	(4,392)
Finite-lived intangible assets, amortization expense, year 2021	(4,392)
Finite-lived intangible assets, amortization expense, year 2022	(4,436)
Finite-lived intangible assets, amortization expense, year 2023	(4,444)
Ground Leases [Member]
Finite-lived intangible assets, amortization expense, year 2019	(4,463)
Finite-lived intangible assets, amortization expense, year 2020	(4,463)
Finite-lived intangible assets, amortization expense, year 2021	(4,463)
Finite-lived intangible assets, amortization expense, year 2022	(4,463)
Finite-lived intangible assets, amortization expense, year 2023	(4,463)
Retail Lease [Member]
Finite-lived intangible assets; amortization income, year 2019	71
Finite-lived intangible assets; amortization income, year 2020	71
Finite-lived intangible assets; amortization income, year 2021	71
Finite-lived intangible assets; amortization income, year 2022	27
Finite-lived intangible assets; amortization income, year 2023	$ 19

Real Estate and Lease Intangi_7

Real Estate and Lease Intangibles - Real Estate Acquisitions and Dispositions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)PropertyApartmentUnit	Dec. 31, 2017USD ($)PropertyApartmentUnit
Properties acquired | Property	5	4
Property Units acquired | ApartmentUnit	1,478	947
Purchase Price	$ 707,005	$ 468,050
Properties disposed | Property	5	5
Property Units disposed | ApartmentUnit	1,292	1,194
Sales Price	$ 708,820	$ 388,400
Rental Properties – Consolidated [Member]
Properties acquired | Property	5	4
Property Units acquired | ApartmentUnit	1,478	947
Purchase Price	$ 707,005	$ 468,050
Properties disposed | Property	5	5
Property Units disposed | ApartmentUnit	1,292	1,194
Sales Price	$ 706,120	$ 354,950
Land [Member]
Purchase Price	$ 113,700	$ 68,300
Properties disposed | Property	0	0
Property Units disposed | ApartmentUnit	0	0
Sales Price	$ 2,700	$ 33,450

Real Estate and Lease Intangi_8

Real Estate and Lease Intangibles - Real Estate Acquisitions and Dispositions (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018
Purchase Price	$ 468,050	$ 707,005
Ground Leases [Member] | Other Assets [Member]
Finite-Lived Intangible Asset, Off-market Lease, Favorable, Gross	191,918	191,918
Land [Member]
Purchase Price	68,300	113,700
Depreciable Property [Member]
Purchase Price	386,200	594,400
Rental Properties – Consolidated [Member]
Purchase Price	468,050	$ 707,005
Rental Properties – Consolidated [Member] | Ground Leases [Member] | Other Assets [Member]
Finite-Lived Intangible Asset, Off-market Lease, Favorable, Gross	$ 13,700
Lease expiration year	2,113

Real Estate and Lease Intangi_9

Real Estate and Lease Intangibles - Acquisitions and Dispositions - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)Building	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Net gain on sales of real estate properties	$ 256,810	$ 157,057	$ 4,044,055
Net gain on sales of land parcels	987	19,167	15,731
Non-cash asset impairment charge	$ 702	1,693	$ 0
Non-cash asset impairment charge		1,700
Real estate held-for-sale, value		$ 200
San Francisco
Number of buildings damaged due to fire | Building	1

Commitments to Acquire_Dispos_3

Commitments to Acquire/Dispose of Real Estate - Separate Agreements to Dispose of (Parenthetical) (Details)	Feb. 21, 2019Land
Subsequent Event [Member] | Land [Member]
Property/Unit schedule
Land Parcels	1

Commitments to Acquire_Dispos_4

Commitments to Acquire/Dispose of Real Estate - Separate Agreements to Dispose of (Details) - Subsequent Event [Member] $ in Thousands	Feb. 21, 2019USD ($)PropertyApartmentUnit
Property/Unit schedule
Properties | Property	1
Apartment Units | ApartmentUnit	266
Sales Price | $	$ 239,400
Rental Properties Disposed [Member]
Property/Unit schedule
Properties | Property	1
Apartment Units | ApartmentUnit	266
Sales Price | $	$ 237,500
Land [Member]
Property/Unit schedule
Properties | Property	0
Apartment Units | ApartmentUnit	0
Sales Price | $	$ 1,900

Investments in Partially Owne_3

Investments in Partially Owned Entities - Consolidated Variable Interest Entities ("VIEs") - Additional Information (Details) $ in Thousands	Dec. 31, 2018USD ($)PropertyApartmentUnit	Dec. 31, 2017USD ($)
Variable Interest Entity [Line Items]
Properties | Property	307
Apartment units | ApartmentUnit	79,482
Total assets	$ 20,394,209	$ 20,570,599
Total liabilities	$ 9,615,454	9,729,781
Consolidated VIE [Member]
Variable Interest Entity [Line Items]
Properties | Property	17
Apartment units | ApartmentUnit	3,535
Total assets	$ 713,600	518,900
Total liabilities	$ 313,900	$ 307,000

Investments in Partially Owne_4

Investments in Partially Owned Entities - Summary of Companys Investment in Unconsolidated Entities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	$ 58,349	$ 58,254
Operating Property [Member] | Unconsolidated Non-VIE [Member]
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	$ 10,494	12,367
Ownership Percentage	20.00%
Other [Member]
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	$ 5,490	1,436
Consolidated VIE [Member] | Wisconsin Place Developer [Member]
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	$ 42,365	$ 44,451
Ownership Percentage	33.30%

Investments in Partially Owne_5

Investments in Partially Owned Entities - Summary of Companys Investment in Unconsolidated Entities (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2018ApartmentUnitJointVenture
Variable Interest Entity [Line Items]
Apartment units	79,482
Operating Property [Member] | Unconsolidated Non-VIE [Member]
Variable Interest Entity [Line Items]
Apartment units	945
Number of joint ventures under agreements | JointVenture	2

Restricted Deposits - Restricte

Restricted Deposits - Restricted Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Mortgage escrow deposits:
Real estate taxes and insurance	$ 876	$ 845
Replacement reserves	8,641	8,347
Mortgage principal reserves/sinking funds	9,754	3,167
Other	852	852
Mortgage escrow deposits	20,123	13,211
Restricted cash:
Earnest money on pending acquisitions	5,000	750
Restricted deposits on real estate investments	540	58
Resident security and utility deposits	35,659	35,183
Other	7,549	913
Restricted cash	48,748	36,904
Restricted deposits	$ 68,871	$ 50,115	$ 141,881

Debt - Mortgage Notes Payable -

Debt - Mortgage Notes Payable - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Mortgage notes payable	$ 2,385,470	$ 3,618,722
Debt instrument, maturity date	Jan. 10, 2022
Weighted average interest rate	4.25%	4.35%
Historical cost, net of accumulated depreciation, of encumbered properties	$ 3,200,000	$ 4,400,000
ERPOP [Member]
Debt Instrument [Line Items]
Mortgage notes payable	2,385,470	3,618,722
Mortgages [Member]
Debt Instrument [Line Items]
Mortgage notes payable	$ 6,600
Repayments of long-term debt		$ 10,700
Debt instrument, maturity date	May 28, 2061	May 28, 2061
Write off of deferred debt issuance cost	$ 3,000	$ 300
Write off unamortized (premium) discount	$ 16,300	$ (700)
Weighted average interest rate	4.15%	4.33%
Mortgages [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	0.10%	0.10%
Mortgages [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.90%	6.90%
Conventional Mortgage Loan [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	$ 43,700	$ 193,400
Debt instrument, maturity year	2,018
Prepayment penalty charges		$ 1,500
Debt instrument maturity year, start		2,017
Debt instrument maturity year, end		2,048
Bonds [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	$ 254,200
Debt instrument maturity year, start	2,028
Debt instrument maturity year, end	2,042
New Floating Rate Tax Exempt Mortgage Bond [Member] | ERPOP [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Apr. 1, 2042
Proceeds from issuance of long-term debt	$ 96,900
Credit enhanced debt [Member]
Debt Instrument [Line Items]
Mortgage notes payable	440,700	$ 598,600
Fannie Mae Pool 3 [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	$ 550,000	$ 300,000
Debt instrument, interest rate, stated percentage	6.08%	5.987%
Debt instrument, maturity year	2,020	2,019
Prepayment penalty charges	$ 22,100	$ 10,800
Freddie Mac Loan Pool [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	$ 500,000
Debt instrument, interest rate, stated percentage	5.19%
Debt instrument, maturity date	Oct. 1, 2019

Debt - Summary of Unsecured Not

Debt - Summary of Unsecured Note Balances, Interest Rate and Maturity Date Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Net Principal Balance	$ 5,933,286	$ 5,038,812
Weighted average interest rate	4.25%	4.35%
Fixed Rate Public Notes [Member]
Debt Instrument [Line Items]
Net Principal Balance	$ 5,485,884	$ 4,591,373
Weighted average interest rate	4.37%	4.61%
Debt instrument maturity year, start	2,020	2,020
Debt instrument maturity year, end	2,047	2,047
Fixed Rate Public Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	2.85%	2.85%
Fixed Rate Public Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	7.57%	7.57%
Floating Rate Public Notes [Member]
Debt Instrument [Line Items]
Net Principal Balance	$ 447,402	$ 447,439
Weighted average interest rate	2.84%	1.82%
Debt instrument, maturity year	2,019	2,019

Debt - Summary of Unsecured N_2

Debt - Summary of Unsecured Note Balances, Interest Rate and Maturity Date Information (Parenthetical) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Debt instrument, maturity date	Jan. 10, 2022
2.375% Notes [Member]
Debt Instrument [Line Items]
Proceeds from issuance of unsecured debt	$ 450
Debt instrument, interest rate, stated percentage	2.375%
Debt instrument, maturity date	Jul. 1, 2019
Debt instrument, basis spread on variable rate	0.61%
2.375% Notes [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, description of variable rate basis	90-Day LIBOR plus 0.61%.

Debt - Notes - Additional Infor

Debt - Notes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Shelf registration statement effective date	Jun. 28, 2016
Shelf registration statement expiry date	Jun. 28, 2019
Repayments of notes payable		$ 497,975	$ 1,500,000
3.50% Notes [Member]
Debt Instrument [Line Items]
Proceeds from issuance of unsecured debt	$ 500,000
Debt instrument, interest rate, stated percentage	3.50%
Proceeds from debt, net of issuance costs	$ 497,000
Debt instrument, interest rate, effective percentage	3.61%
4.15% Notes [Member]
Debt Instrument [Line Items]
Proceeds from issuance of unsecured debt	$ 400,000
Debt instrument, interest rate, stated percentage	4.15%
Proceeds from debt, net of issuance costs	$ 399,300
Debt instrument, interest rate, effective percentage	3.85%
5.75 % Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage		5.75%
Repayments of notes payable		$ 394,100
7.125% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage		7.125%
Repayments of notes payable		$ 103,900
3.25% Notes [Member]
Debt Instrument [Line Items]
Proceeds from issuance of unsecured debt		$ 400,000
Debt instrument, interest rate, stated percentage		3.25%
Proceeds from debt, net of issuance costs		$ 399,300
Debt instrument, interest rate, effective percentage		3.32%
4.00% Notes [Member]
Debt Instrument [Line Items]
Proceeds from issuance of unsecured debt		$ 300,000
Debt instrument, interest rate, stated percentage		4.00%
Proceeds from debt, net of issuance costs		$ 293,200
Debt instrument, interest rate, effective percentage		4.11%

Debt - Line of Credit and Comme

Debt - Line of Credit and Commercial Paper - Additional Information (Details) - USD ($)	1 Months Ended	12 Months Ended
	Nov. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Oct. 31, 2016	Feb. 28, 2015
Line of Credit Facility [Line Items]
Debt instrument, maturity date		Jan. 10, 2022
Weighted average interest rate		4.25%	4.35%
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Unsecured revolving credit facility					$ 500,000,000
Commercial paper, net		$ 499,200,000	$ 299,800,000
Commercial paper principal outstanding		500,000,000	300,000,000
Unamortized discount		$ 800,000	$ 200,000
Weighted average interest rate		2.35%	1.41%
Commercial paper weighted average days outstanding		22 days	18 days
Commercial paper principal outstanding		$ 500,000,000	$ 500,000,000
Unsecured Revolving Credit Facility
Line of Credit Facility [Line Items]
Unsecured revolving credit facility	$ 2,000,000,000			$ 2,500,000,000
Ability to increase LOC facility	$ 750,000,000
Debt instrument, basis spread on variable rate	0.825%
Percentage points of line of credit facility commitment fee		0.125%
Revolving Credit Facility
Line of Credit Facility [Line Items]
Commercial paper principal outstanding		$ 0	$ 0
Weighted average interest rate		2.97%	2.00%
Amount restricted/dedicated to support letters of credit		$ 6,700,000	$ 6,600,000
Line of credit facility current borrowing capacity		$ 1,400,000	$ 1,690,000

Debt - Other - Additional Infor

Debt - Other - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Letters of credit outstanding	$ 9	$ 9

Debt - Summary of Aggregate Pay

Debt - Summary of Aggregate Payments of Principal on All Debt (Details) $ in Thousands	Dec. 31, 2018USD ($)
Debt Disclosure [Abstract]
2,019	$ 974,954
2,020	1,129,292
2,021	928,106
2,022	266,141
2,023	1,331,600
Thereafter	4,282,668
Subtotal	8,912,761
Deferred Financing Costs and Unamortized (Discount)	(94,822)
Total	$ 8,817,939

Derivative and Other Fair Val_3

Derivative and Other Fair Value Instruments - Summary of Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	$ 8,817,939	$ 8,957,291
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	8,833,928	9,235,128
Mortgage Notes Payable, Net [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	2,385,470	3,618,722
Mortgage Notes Payable, Net [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	2,352,502	3,615,384
Unsecured Debt [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	6,432,469	5,338,569
Unsecured Debt [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	$ 6,481,426	$ 5,619,744

Derivative and Other Fair Val_4

Derivative and Other Fair Value Instruments - Summary of Consolidated Derivative Instruments (Details)	12 Months Ended
	Dec. 31, 2018USD ($)
Fair Value Hedges [Member]
Derivative [Line Items]
Current Notional Balance	$ 450,000,000
Maturity Date	2,019
Fair Value Hedges [Member] | Minimum [Member]
Derivative [Line Items]
Interest Rate	2.375%
Fair Value Hedges [Member] | Maximum [Member]
Derivative [Line Items]
Interest Rate	2.375%
Forward Starting Swaps [Member]
Derivative [Line Items]
Current Notional Balance	$ 500,000,000
Maturity Date	2,029
Forward Starting Swaps [Member] | Minimum [Member]
Derivative [Line Items]
Interest Rate	2.2665%
Forward Starting Swaps [Member] | Maximum [Member]
Derivative [Line Items]
Interest Rate	3.1163%

Derivative and Other Fair Val_5

Derivative and Other Fair Value Instruments - Summary of Consolidated Derivative Instruments (Parenthetical) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Derivative [Line Items]
Debt instrument, maturity date	Jan. 10, 2022
2.375% Notes [Member]
Derivative [Line Items]
Proceeds from issuance of unsecured debt	$ 450
Interest Rate Ranges	2.375%
Debt instrument, maturity date	Jul. 1, 2019
2.375% Notes [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Debt instrument, basis spread on variable rate	0.61%
Debt instrument, description of variable rate basis	90-Day LIBOR

Derivative and Other Fair Val_6

Derivative and Other Fair Value Instruments - Summary of Fair Value Measurements for Each Major Category of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Fair Value Of SERP Investments	$ 134,088	$ 140,159
Assets, Fair Value Disclosure	136,088	145,302
Other Liabilities, Fair Value Disclosure	134,088	140,159
Liabilities, Fair Value Disclosure	146,216	141,756
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	379,106	366,955	$ 442,092	$ 566,783
Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	2,277	1,597
Forward Starting Swaps [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	2,000	5,143
Other Liabilities, Forward Starting Swaps	9,851
Fair Value, Inputs, Level 1 [Member]
Derivatives, Fair Value [Line Items]
Fair Value Of SERP Investments	134,088	140,159
Assets, Fair Value Disclosure	134,088	140,159
Other Liabilities, Fair Value Disclosure	134,088	140,159
Liabilities, Fair Value Disclosure	134,088	140,159
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Forward Starting Swaps [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	0	0
Other Liabilities, Forward Starting Swaps	0
Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair Value Of SERP Investments	0	0
Assets, Fair Value Disclosure	2,000	5,143
Other Liabilities, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure	12,128	1,597
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	379,106	366,955
Fair Value, Inputs, Level 2 [Member] | Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	2,277	1,597
Fair Value, Inputs, Level 2 [Member] | Forward Starting Swaps [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	2,000	5,143
Other Liabilities, Forward Starting Swaps	9,851
Fair Value, Inputs, Level 3 [Member]
Derivatives, Fair Value [Line Items]
Fair Value Of SERP Investments	0	0
Assets, Fair Value Disclosure	0	0
Other Liabilities, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure	0	0
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Forward Starting Swaps [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	0	$ 0
Other Liabilities, Forward Starting Swaps	$ 0

Derivative and Other Fair Val_7

Derivative and Other Fair Value Instruments - Summary of Effect of Fair Value Hedges on the Accompanying Consolidated Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative	$ (680)	$ (3,454)	$ (1,798)
Amount of Gain/(Loss) Recognized in Income on Hedged Item	680	3,454	1,798
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative	(680)	(3,454)	(1,798)
Amount of Gain/(Loss) Recognized in Income on Hedged Item	$ 680	$ 3,454	$ 1,798

Derivative and Other Fair Val_8

Derivative and Other Fair Value Instruments - Summary of Effect of Cash Flow Hedges on the Accompanying Consolidated Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion - Amount of Gain/(Loss) Recognized in OCI on Derivative	$ 5,124	$ 6,439	$ (3,989)
Effective Portion - Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income	(18,452)	(18,858)	(41,758)
Ineffective Portion - Amount of Gain/ (Loss) Reclassified from Accumulated OCI into Income			(74)
Forward Starting Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion - Amount of Gain/(Loss) Recognized in OCI on Derivative	5,124	6,439	(3,989)
Effective Portion - Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income	$ (18,452)	$ (18,858)	(41,758)
Ineffective Portion - Amount of Gain/ (Loss) Reclassified from Accumulated OCI into Income			$ (74)

Derivative and Other Fair Val_9

Derivative and Other Fair Value Instruments - Additional Information (Details)	1 Months Ended				12 Months Ended
	Nov. 30, 2018USD ($)DerivativeInstrument	Feb. 28, 2018USD ($)DerivativeInstrument	Aug. 31, 2017USD ($)DerivativeInstrument	Oct. 31, 2016USD ($)DerivativeInstrument	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Derivative [Line Items]
Unrealized gain (loss) on interest rate cash flow hedges, pretax, accumulated other comprehensive income (loss)					$ 65,000,000	$ 88,600,000
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net					$ 20,900,000
Derivative instruments, gain (loss) recognized in income, ineffective portion and amount excluded from effectiveness testing, net							$ (74,000)
2.85% Notes [Member]
Derivative [Line Items]
Forward starting swaps settled | DerivativeInstrument				1
Interest expense				$ 9,000
Increase (decrease) in charges hedge termination activities				$ 4,600,000
Debt instrument, term				10 years
Payments for (proceeds from) hedge, investing activities				$ 4,700,000
Proceeds from issuance of unsecured debt				500,000,000
Derivative instruments, gain (loss) recognized in income, ineffective portion and amount excluded from effectiveness testing, net				$ (74,000)
Forward Starting Swaps [Member]
Derivative [Line Items]
Proceeds from settlement of derivative instruments	$ 16,400,000	$ 1,600,000	$ 1,300,000
Forward starting swaps settled | DerivativeInstrument	6	2	4
Interest expense	$ 120,000
Increase (decrease) in charges hedge termination activities	(16,500,000)	$ (1,600,000)	$ (1,300,000)
Public notes, face value	$ 400,000,000	$ 500,000,000	$ 400,000,000
Debt instrument, term	10 years	10 years	10 years
Derivative instruments, gain (loss) recognized in income, ineffective portion and amount excluded from effectiveness testing, net							$ (74,000)

Earnings Per Share and Earnin_3

Earnings Per Share and Earnings Per Unit - Computation of Net Income per Share Basic and Net Income per Share Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Income from continuing operations	$ 685,192	$ 628,381	$ 4,479,586
Allocation to Noncontrolling Interests – Operating Partnership, net	(24,939)	(22,604)	(171,491)
Partially Owned Properties	(2,718)	(2,323)	(16,430)
Preferred distributions	(3,090)	(3,091)	(3,091)
Income from continuing operations available to Common Shares, net of Noncontrolling Interests	654,445	600,363	4,288,574
Discontinued operations, net of Noncontrolling Interests			498
Net income available to Common Shares	654,445	600,363	4,289,072
Income from continuing operations available to Common Shares	679,384	622,967	4,460,065
Discontinued operations, net	0	0	518
Numerator for net income per share – diluted	$ 679,384	$ 622,967	$ 4,460,583
Weighted average Common Shares outstanding	368,052	366,968	365,002
OP Units	12,869	12,901	13,827
Dilutive Securities Options	2,774	2,809	3,163
Denominator for net income per share – diluted	383,695	382,678	381,992
Net income available to Common Shares	$ 1.78	$ 1.64	$ 11.75
Net income available to Common Shares	1.77	1.63	11.68
Income from continuing operations available to Common Shares	1.78	1.64	11.75
Net income available to Units	1.78	1.64	11.75
Income from continuing operations available to Common Shares	1.77	1.63	11.68
Net income available to Units	1.77	1.63	11.68
Distributions declared per Common Share outstanding	$ 2.16	$ 2.015	$ 13.015

Earnings Per Share and Earnin_4

Earnings Per Share and Earnings Per Unit - Computation of Net Income per Unit Basic and Net Income per Unit Diluted for Operating Partnership (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income from continuing operations	$ 685,192	$ 628,381	$ 4,479,586
Partially Owned Properties	(2,718)	(2,323)	(16,430)
Discontinued operations, net	$ 0	$ 0	$ 518
Dilutive Securities Options	2,774	2,809	3,163
Denominator for net income per share – diluted	383,695	382,678	381,992
Net income available to Common Shares	$ 1.78	$ 1.64	$ 11.75
Net income available to Common Shares	1.77	1.63	11.68
Income from continuing operations available to Common Shares	1.78	1.64	11.75
Income from continuing operations available to Common Shares	$ 1.77	$ 1.63	$ 11.68
ERPOP [Member]
Income from continuing operations	$ 685,192	$ 628,381	$ 4,479,586
Partially Owned Properties	(2,718)	(2,323)	(16,430)
Allocation to Preference Units	(3,090)	(3,091)	(3,091)
Income from continuing operations available to Units	679,384	622,967	4,460,065
Discontinued operations, net			518
Numerator for net income per Unit – basic and diluted	$ 679,384	$ 622,967	$ 4,460,583
Denominator for net income per Unit – basic	380,921	379,869	378,829
Dilutive Securities Options	2,774	2,809	3,163
Denominator for net income per share – diluted	383,695	382,678	381,992
Net income available to Common Shares	$ 1.78	$ 1.64	$ 11.75
Net income available to Common Shares	1.77	1.63	11.68
Income from continuing operations available to Common Shares	1.78	1.64	11.75
Income from continuing operations available to Common Shares	1.77	1.63	11.68
Distributions declared per Unit outstanding	$ 2.16	$ 2.015	$ 13.015

Individually Significant Disp_3

Individually Significant Dispositions - Additional Information (Details) - Starwood Portfolio [Member] $ in Millions	Oct. 23, 2015USD ($)PropertyMarket	Dec. 31, 2016
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of operating properties | Property	72
Number of markets | Market	23,262
Proceeds from sale of operating properties | $	$ 5,365
Disposal Group, Not Discontinued Operations [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Percentage of consolidated NOI		1.20%

Individually Significant Disp_4

Individually Significant Dispositions - Results of Operations Attributable to Starwood Transaction (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
REVENUES
Rental income	$ 2,577,681	$ 2,470,689	$ 2,422,233
Total revenues	2,578,434	2,471,406	2,425,800
EXPENSES
Property and maintenance	429,335	405,281	406,823
Real estate taxes and insurance	357,814	335,495	317,387
Property management	92,485	85,493	82,015
General and administrative	53,813	52,224	57,840
Depreciation	785,725	743,749	705,649
Total expenses	1,719,874	1,623,935	1,569,714
Operating income	858,560	847,471	856,086
Interest and other income	15,317	6,136	65,773
Other expenses	(17,267)	(5,186)	(10,368)
Interest:
Expense incurred, net	(413,360)	(383,890)	(482,246)
Amortization of deferred financing costs	(11,310)	(8,526)	(12,633)
Income and other tax (expense) benefit	(878)	(478)	(1,613)
Net gain (loss) on sales of real estate properties	256,810	157,057	4,044,055
Net Income (Loss) Attributable to Noncontrolling Interest	(24,939)	(22,604)	(171,511)
Net income attributable to controlling interests	$ 657,535	$ 603,454	4,292,163
Starwood Portfolio [Member] | Disposal Group, Not Discontinued Operations [Member]
REVENUES
Rental income			30,785
Total revenues			30,785
EXPENSES
Property and maintenance			7,838
Real estate taxes and insurance			2,912
Property management			2
General and administrative			23
Depreciation			0
Total expenses			10,775
Operating income			20,010
Interest and other income			21
Other expenses			0
Interest:
Expense incurred, net			(380)
Amortization of deferred financing costs			(707)
Income and other tax (expense) benefit			(1)
Net gain (loss) on sales of real estate properties			3,161,097
Income from operations attributable to controlling interests – Operating Partnership			3,180,040
Net Income (Loss) Attributable to Noncontrolling Interest			(122,152)
Net income attributable to controlling interests			$ 3,057,888

Share Incentive Plans - Additio

Share Incentive Plans - Additional Information (Details) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2015	Dec. 31, 2018USD ($)Installmentshares	Dec. 31, 2017$ / sharesshares	Dec. 31, 2016$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized		12,980,741
Share-based compensation arrangement by share-based payment award, number of shares available for grant		4,835,914
Vesting period		3 years
Expiration period		10 years
Number of installments vesting | Installment		3
Individual potential target award minimum	0.00%
Individual potential target award maximum	200.00%
Percentage of dividend payments		10.00%
Percent of award target performance metric	50.00%
Compensation information
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized | $		$ 7.5
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition		1 year 3 months 21 days
Share-based compensation arrangement by share-based payment award, options, exercisable, number			5,336,043	5,610,677
Share-based compensation arrangement by share-based payment award, options, exercisable, weighted average exercise price | $ / shares			$ 43.24	$ 40.91
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized		14,725,321

Share Incentive Plans - Schedul

Share Incentive Plans - Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Compensation information
Compensation Expense	$ 27,132	$ 24,997	$ 30,530
Compensation Capitalized	1,218	1,076	2,726
Restricted Units In-Lieu of Bonus	4,418	1,809	4,022
Compensation Equity	32,768	27,882	37,278
Dividends Incurred	1,717	1,502	14,256
Restricted Shares [Member]
Compensation information
Compensation Expense	7,406	9,209	13,539
Compensation Capitalized	852	568	1,477
Restricted Units In-Lieu of Bonus	0	0	0
Compensation Equity	8,258	9,777	15,016
Dividends Incurred	754	761	6,494
Restricted Stock Units (RSUs) [Member]
Compensation information
Compensation Expense	12,310	10,214	13,567
Compensation Capitalized	36	119	591
Restricted Units In-Lieu of Bonus	1,663	190	4,022
Compensation Equity	14,009	10,523	18,180
Dividends Incurred	963	741	7,762
Employee Stock Option [Member]
Compensation information
Compensation Expense	6,683	4,893	2,839
Compensation Capitalized	296	323	593
Restricted Units In-Lieu of Bonus	2,755	1,619	0
Compensation Equity	9,734	6,835	3,432
Dividends Incurred	0	0	0
Employee Share Purchase Plan Discount [Member]
Compensation information
Compensation Expense	733	681	585
Compensation Capitalized	34	66	65
Restricted Units In-Lieu of Bonus	0	0	0
Compensation Equity	767	747	650
Dividends Incurred	$ 0	$ 0	$ 0

Share Incentive Plans - Award A

Share Incentive Plans - Award Activity of the Share Incentive Plans (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Common Shares Subject to Options, Awards exercised/vested	(1,056,388)	(846,137)	(815,044)
Common Shares Subject to Options, Special Dividend Adjustment			960,986
Employee Stock Option [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Common Shares Subject to Options, Beginning Balance	6,483,832	6,023,101	5,734,365
Common Shares Subject to Options, Awards granted	1,730,942	1,337,898	154,016
Common Shares Subject to Options, Awards exercised/vested	(1,056,388)	(846,137)	(815,044)
Common Shares Subject to Options, Awards forfeited	(38,133)	(27,547)	(10,512)
Common Shares Subject to Options, Awards expired	(8,018)	(3,483)	(710)
Common Shares Subject to Options, Ending Balance	7,112,235	6,483,832	6,023,101
Weighted Average Exercise Price per Option, Beginning Balance	$ 46.46	$ 42.05	$ 48.04
Weighted Average Exercise Price per Option, Awards granted	60.40	60.88	64.99
Weighted Average Exercise Price per Option, Awards exercised/vested	29.05	37.26	38.01
Weighted Average Exercise Price per Option, Awards forfeited	60.74	61.85	63.43
Weighted Average Exercise Price per Option, Awards expired	59.70	65.91	68.40
Weighted Average Exercise Price per Option, Ending Balance	$ 52.35	$ 46.46	$ 42.05
Restricted Shares [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Restricted Shares, Beginning Balance	369,741	452,034	522,150
Restricted Shares, Awards granted	129,303	93,867	154,296
Restricted Shares, Awards exercised/vested	(194,116)	(165,744)	(217,805)
Restricted Shares, Awards forfeited	(5,503)	(10,416)	(6,607)
Restricted Shares, Awards Expired	0	0	0
Restricted Shares, Ending Balance	299,425	369,741	452,034
Weighted Average Fair Value per Restricted Share, Beginning Balance	$ 73.67	$ 70.35	$ 63.67
Weighted Average Fair Value per Restricted Share, Awards granted	62.25	61.94	75.19
Weighted Average Fair Value per Restricted Share, Awards exercised/vested	77.32	58.04	57.75
Weighted Average Fair Value per Restricted Share, Awards forfeited	65.77	72.44	70.73
Weighted Average Fair Value per Restricted Share, Awards Expired	0	0	0
Weighted Average Fair Value per Restricted Share, Ending Balance	$ 66.52	$ 73.67	$ 70.35
Restricted Units [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Restricted Units, Beginning Balance	901,260	802,257	888,725
Restricted Units, Awards Granted	267,074	291,921	289,273
Restricted Units, Awards exercised/vested	(28,486)	(192,644)	(374,217)
Restricted Units, Awards forfeited	0	(274)	(1,524)
Restricted Units, Awards Expired	0	0	0
Restricted Units, Ending Balance	1,139,848	901,260	802,257
Weighted Average Fair Value per Restricted Unit, Beginning Balance	$ 77.61	$ 75.26	$ 63.91
Weighted Average Fair Value per Restricted Unit, Awards granted	61.60	68.57	81.05
Weighted Average Fair Value per Restricted Unit, Awards exercised/vested	55.50	54.16	52.73
Weighted Average Fair Value per Restricted Unit, Awards forfeited	0	75.50	86.35
Weighted Average Fair Value per Restricted Unit, Awards Expired	0	0	0
Weighted Average Fair Value per Restricted Unit, Ending Balance	$ 71.07	$ 77.61	$ 75.26

Share Incentive Plans - Award_2

Share Incentive Plans - Award Activity of the Share Incentive Plans (Parenthetical) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Weighted average grant date fair value for Options	$ 6.15	$ 5.86	$ 13.02
Distributions declared per Common Share outstanding	2.16	2.015	13.015
Starwood Portfolio [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Distributions declared per Common Share outstanding			11
Employee Stock Option [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Weighted average grant date fair value for Options	$ 6.17	$ 5.86	$ 11.09
Intrinsic value of options exercised	$ 42.9	$ 25.6	$ 26.2
Restricted Shares [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	11.5	10.2	15.6
Restricted Units [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	$ 1.8	$ 11.7	$ 27.2

Share Incentive Plans - Informa

Share Incentive Plans - Information Regarding Options Outstanding and Exercisable (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)$ / sharesshares
Share Based Compensation [Abstract]
Options Outstanding, Options | shares	7,112,235
Options Exercisable, Options | shares	5,328,020
Options, Vested and expected to vest | shares	7,096,243
Options Outstanding, Weighted Average Remaining Contractual Life in Years	5 years 6 months 29 days
Options Exercisable, Weighted Average Remaining Contractual Life in Years	4 years 6 months 7 days
Options Vested and expected to vest, Weighted Average Remaining Contractual Life in Years	5 years 6 months 25 days
Options Outstanding, Weighted Average Exercise Price | $ / shares	$ 52.35
Options Exercisable, Weighted Average Exercise Price | $ / shares	49.57
Vested and expected to vest, Weighted Average Exercise Price | $ / shares	$ 52.33
Options Outstanding, Aggregate Intrinsic Value | $	$ 97,633
Options Exercisable, Aggregate Intrinsic Value | $	88,031
Vested and expected to vest, Aggregate Intrinsic Value | $	$ 97,543

Share Incentive Plans - Infor_2

Share Incentive Plans - Information Regarding Options Outstanding and Exercisable (Parenthetical) (Details)	Dec. 31, 2018$ / shares
Share Based Compensation [Abstract]
Market value of common shares	$ 66.01

Employee Plans - Additional Inf

Employee Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of common shares that can be acquired by the employee and trustees under employees share purchase plan	$ 100,000
Number of common shares authorized after amendment	7,000,000
Common Shares available for purchase under the ESPP	2,762,463
Purchase price of common stock	85.00%
Maximum eligible compensation percentage for the defined contribution plan (the 401(k) Plan)	4.00%
Defined contribution plan vesting period	5 years
Defined contribution plan, compensation expense	$ 4,900,000	$ 4,600,000	$ 4,900,000
Highly Compensated Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum eligible compensation percentage for the defined contribution plan (the 401(k) Plan)	3.00%

Employee Plans - Summary of Inf

Employee Plans - Summary of Information Regarding the Common Shares Issued Under the ESPP (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee Service Share Based Compensation Aggregate Disclosures [Abstract]
Shares issued	75,414	68,286	63,909
Issuance price ranges, Minimum	$ 47.80	$ 52.79	$ 51.85
Issuance price ranges, Maximum	$ 57.09	$ 58.06	$ 63.37
Issuance proceeds	$ 3,879	$ 3,744	$ 3,686

Distribution Reinvestment Plan

Distribution Reinvestment Plan - Additional Information (Details) - shares	Dec. 31, 2018	Sep. 30, 2014
Distribution Reinvestment And Share Purchase Plan [Abstract]
Common shares registered with distribution reinvestment and share purchase Plan (2011 DRIP)		4,790,000
Number of shares available for issuance	4,676,606

Transactions with Related Par_2

Transactions with Related Parties - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transactions [Abstract]
Lease termination date	Jan. 31, 2022
Amount incurred for leased office space	$ 2.5	$ 2.8	$ 2.7

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018USD ($)PropertyApartmentUnit	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Accrual for environmental loss contingencies	$ 4,500,000
Number of properties with environmental reserves | Property	3
Littigation amount total payout	$ 900,000
Litigation reserve oustanding amount	$ 0
Projects in various stages of development | Property	3
Units in various stages of development | ApartmentUnit	690
Consolidated project under development commitment fund	$ 414,100,000
Various stages of development with estimated completion dates ranging through September 30, 2021	Sep. 30, 2021
Total operating lease payments	$ 27,800,000	$ 26,600,000	$ 26,200,000
Compensation expense, recognized	$ 300,000	$ 400,000	$ 300,000
Partially Owned Properties – Unconsolidated
Number of unconsolidated projects | Property	2

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Contractual Obligations (Details) $ in Thousands	Dec. 31, 2018USD ($)
Operating Leases:
Minimum Rent Payments Due, Year 1	$ (16,718)
Minimum Rent Payments Due, Year 2	(16,726)
Minimum Rent Payments Due, Year 3	(16,665)
Minimum Rent Payments Due, Year 4	(14,500)
Minimum Rent Payments Due, Year 5	(14,339)
Minimum Rent Payments Due, Thereafter	(953,001)
Minimum Rent Payments Due, Total	(1,031,949)
Operating Leases, Future Minimum Payments Receivable, Current	64,790
Operating Leases, Future Minimum Payments Receivable, in Two Years	61,409
Operating Leases, Future Minimum Payments Receivable, in Three Years	57,326
Operating Leases, Future Minimum Payments Receivable, in Four Years	53,193
Operating Leases, Future Minimum Payments Receivable, in Five Years	46,016
Operating Leases, Future Minimum Payments Receivable, Thereafter	172,694
Operating Leases, Future Minimum Payments Receivable	455,428
Other Long-Term Liabilities:
Deferred Compensation Due, Year 1	(803)
Deferred Compensation Due, Year 2	(1,100)
Deferred Compensation Due, Year 3	(1,100)
Deferred Compensation Due, Year 4	(1,100)
Deferred Compensation Due, Year 5	(975)
Deferred Compensation Due, Thereafter	(3,810)
Deferred Compensation Due, Total	$ (8,888)

Commitments and Contingencies_3

Commitments and Contingencies - Schedule of Contractual Obligations (Parenthetical) (Details)	Dec. 31, 2018Property
Commitments And Contingencies Disclosure [Abstract]
Number of properties	12

Reportable Segments - Additiona

Reportable Segments - Additional Information (Details)	Dec. 31, 2018PropertyCustomer	Dec. 31, 2017Customer	Dec. 31, 2016Customer
Segment Reporting Information [Line Items]
Number of customer contributed 10% or more of total revenue | Customer	0	0	0
Denver | Non-same store
Segment Reporting Information [Line Items]
Number of properties acquired | Property	2

Reportable Segments - Reconcili

Reportable Segments - Reconciliation of NOI from Rental Real Estate Specific to Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Rental income	$ 2,577,681	$ 2,470,689	$ 2,422,233
Property and maintenance expense	(429,335)	(405,281)	(406,823)
Real estate taxes and insurance expense	(357,814)	(335,495)	(317,387)
Operating income	858,560	847,471	856,086
Same Store, Non-same Store and Other
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Rental income	2,577,681	2,470,689	2,422,233
Property and maintenance expense	(429,335)	(405,281)	(406,823)
Real estate taxes and insurance expense	(357,814)	(335,495)	(317,387)
Total operating expenses	(787,149)	(740,776)	(724,210)
Operating income	$ 1,790,532	$ 1,729,913	$ 1,698,023

Reportable Segments - NOI for E

Reportable Segments - NOI for Each Segment from Our Rental Real Estate Specific to Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Rental income	$ 2,577,681	$ 2,470,689	$ 2,422,233
Operating income	858,560	847,471	856,086
Total Assets	20,394,209	20,570,599
Capital Expenditures	188,501	202,607
Same store
Segment Reporting Information [Line Items]
Rental income	2,363,491	2,311,240	2,200,094
Operating expenses	705,890	681,198	639,342
Operating income	1,657,601	1,630,042	1,560,752
Total Assets	16,945,585	17,412,173
Capital Expenditures	181,559	195,960
Non-same store/other
Segment Reporting Information [Line Items]
Rental income	214,190	159,449	222,139
Operating expenses	81,259	59,578	84,868
Operating income	132,931	99,871	137,271
Total Assets	3,448,624	3,158,426
Capital Expenditures	6,942	6,647
Same Store, Non-same Store and Other
Segment Reporting Information [Line Items]
Rental income	2,577,681	2,470,689	2,422,233
Operating expenses	787,149	740,776	724,210
Operating income	1,790,532	1,729,913	1,698,023
Other markets | Same store
Segment Reporting Information [Line Items]
Rental income	1,940	1,839	1,797
Operating expenses	657	652	567
Operating income	1,283	1,187	1,230
Total Assets	12,781	12,768
Capital Expenditures	163	103
Los Angeles | Same store
Segment Reporting Information [Line Items]
Rental income	416,688	402,192	382,425
Operating expenses	119,473	114,055	111,055
Operating income	297,215	288,137	271,370
Total Assets	2,608,347	2,692,602
Capital Expenditures	28,306	26,921
Orange County | Same store
Segment Reporting Information [Line Items]
Rental income	91,650	88,527	84,590
Operating expenses	22,071	21,544	20,600
Operating income	69,579	66,983	63,990
Total Assets	318,472	328,593
Capital Expenditures	8,192	9,237
San Diego | Same store
Segment Reporting Information [Line Items]
Rental income	91,971	88,507	84,646
Operating expenses	24,023	23,073	22,366
Operating income	67,948	65,434	62,280
Total Assets	405,449	421,267
Capital Expenditures	4,525	4,922
Subtotal - Southern California | Same store
Segment Reporting Information [Line Items]
Rental income	600,309	579,226	551,661
Operating expenses	165,567	158,672	154,021
Operating income	434,742	420,554	397,640
Total Assets	3,332,268	3,442,462
Capital Expenditures	41,023	41,080
San Francisco | Same store
Segment Reporting Information [Line Items]
Rental income	442,773	430,501	371,633
Operating expenses	105,686	108,689	90,393
Operating income	337,087	321,812	281,240
Total Assets	2,967,735	3,039,552
Capital Expenditures	44,837	38,618
Washington DC | Same store
Segment Reporting Information [Line Items]
Rental income	434,545	430,060	424,350
Operating expenses	134,427	129,720	126,154
Operating income	300,118	300,340	298,196
Total Assets	3,702,368	3,803,185
Capital Expenditures	29,616	35,423
New York | Same store
Segment Reporting Information [Line Items]
Rental income	458,366	454,945	456,664
Operating expenses	181,040	170,064	159,302
Operating income	277,326	284,881	297,362
Total Assets	4,063,568	4,160,603
Capital Expenditures	23,472	30,403
Boston | Same store
Segment Reporting Information [Line Items]
Rental income	229,079	223,595	225,014
Operating expenses	63,348	60,931	62,650
Operating income	165,731	162,664	162,364
Total Assets	1,589,000	1,636,925
Capital Expenditures	24,623	28,687
Seattle | Same store
Segment Reporting Information [Line Items]
Rental income	196,479	191,074	168,975
Operating expenses	55,165	52,470	46,255
Operating income	141,314	138,604	122,720
Total Assets	1,277,865	1,316,678
Capital Expenditures	17,825	21,646
Non-same store | Non-same store/other
Segment Reporting Information [Line Items]
Rental income	190,814	95,016	117,143
Operating expenses	63,907	30,742	41,877
Operating income	126,907	64,274	75,266
Total Assets	2,940,770	2,276,312
Capital Expenditures	6,665	3,704
Other [Member] | Non-same store/other
Segment Reporting Information [Line Items]
Rental income	23,376	64,433	104,996
Operating expenses	17,352	28,836	42,991
Operating income	6,024	35,597	$ 62,005
Total Assets	507,854	882,114
Capital Expenditures	$ 277	$ 2,943

Reportable Segments - NOI for_2

Reportable Segments - NOI for Each Segment from Our Rental Real Estate Specific to Continuing Operations (Parenthetical) (Details) - Property	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Disclosure Of Entitys Reportable Segments [Abstract]
Units in same store properties	71,721	71,721	70,117

Subsequent Events_Other - Addit

Subsequent Events/Other - Additional Information (Details) $ in Thousands	Jan. 01, 2019USD ($)	Feb. 21, 2019USD ($)PropertyApartmentUnit	Dec. 31, 2018USD ($)PropertyApartmentUnit	Dec. 31, 2017USD ($)PropertyApartmentUnit	Dec. 31, 2016USD ($)ApartmentUnit
Subsequent Event [Line Items]
Properties acquired | Property			5	4
Property Units acquired | ApartmentUnit			1,478	947
Purchase Price			$ 707,005	$ 468,050
Debt instrument, maturity date			Jan. 10, 2022
Disposed units | ApartmentUnit			1,292	1,194
Proceeds from sale of property			$ 708,820	$ 388,400
Interest and other income			$ 15,317	$ 6,136	$ 65,773
Military Housing [Member]
Subsequent Event [Line Items]
Disposed units | ApartmentUnit					5,161
Proceeds from sale of property					$ 63,300
Interest and other income					$ 52,400
Mortgages [Member]
Subsequent Event [Line Items]
Debt instrument, maturity date			May 28, 2061	May 28, 2061
Fannie Mae Pool 3 [Member] | Mortgages [Member]
Subsequent Event [Line Items]
Debt instrument, interest rate, stated percentage			6.08%	5.987%
Subsequent Event [Member]
Subsequent Event [Line Items]
Properties acquired | Property		3
Property Units acquired | ApartmentUnit		579
Purchase Price		$ 258,700
Subsequent Event [Member] | Fannie Mae Pool 3 [Member] | Mortgages [Member]
Subsequent Event [Line Items]
Proceeds from issuance of long-term debt	$ 288,100
Debt instrument, maturity date	Mar. 1, 2029
Debt instrument, interest rate, stated percentage	3.94%

Quarterly Financial Data (Una_3

Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Unaudited Quarterly Financial Data [Line Items]
Total revenues									$ 2,578,434	$ 2,471,406	$ 2,425,800
Operating income									858,560	847,471	856,086
Net income									685,192	628,381	4,480,104
Net income available to Common Shares									$ 654,445	$ 600,363	$ 4,289,072
Earnings per share – basic:
Net income available to Common Shares									$ 1.78	$ 1.64	$ 11.75
Weighted average Common Shares outstanding									368,052	366,968	365,002
Earnings per share – diluted:
Net income available to Common Shares									$ 1.77	$ 1.63	$ 11.68
Weighted average Common Shares outstanding									383,695	382,678	381,992
ERPOP [Member]
Unaudited Quarterly Financial Data [Line Items]
Total revenues									$ 2,578,434	$ 2,471,406	$ 2,425,800
Operating income									858,560	847,471	856,086
Net income									685,192	628,381	4,480,104
Net income available to Units									$ 679,384	$ 622,967	$ 4,460,583
Earnings per share – basic:
Net income available to Common Shares									$ 1.78	$ 1.64	$ 11.75
Weighted average Units outstanding									380,921	379,869	378,829
Earnings per share – diluted:
Net income available to Common Shares									$ 1.77	$ 1.63	$ 11.68
Weighted average Common Shares outstanding									383,695	382,678	381,992
Scenario, Previously Reported [Member]
Unaudited Quarterly Financial Data [Line Items]
Total revenues	$ 652,743	$ 652,867	$ 639,808	$ 633,016	$ 630,704	$ 624,122	$ 612,480	$ 604,100
Operating income	219,306	224,731	217,654	196,869	214,764	217,786	210,550	204,371
Net income	122,388	223,846	118,410	220,548	130,084	144,196	204,160	149,941
Net income available to Common Shares	$ 116,415	$ 214,164	$ 112,830	$ 211,036	$ 124,669	$ 137,457	$ 195,268	$ 142,969
Earnings per share – basic:
Net income available to Common Shares	$ 0.32	$ 0.58	$ 0.31	$ 0.57	$ 0.34	$ 0.37	$ 0.53	$ 0.39
Weighted average Common Shares outstanding	368,445	368,028	367,930	367,800	367,442	366,996	366,820	366,605
Earnings per share – diluted:
Net income available to Common Shares	$ 0.31	$ 0.58	$ 0.31	$ 0.57	$ 0.34	$ 0.37	$ 0.53	$ 0.39
Weighted average Common Shares outstanding	384,296	383,884	383,423	383,018	383,105	382,945	382,692	382,280
Scenario, Previously Reported [Member] | ERPOP [Member]
Unaudited Quarterly Financial Data [Line Items]
Total revenues	$ 652,743	$ 652,867	$ 639,808	$ 633,016	$ 630,704	$ 624,122	$ 612,480	$ 604,100
Operating income	219,306	224,731	217,654	196,869	214,764	217,786	210,550	204,371
Net income	122,388	223,846	118,410	220,548	130,084	144,196	204,160	149,941
Net income available to Units	$ 120,837	$ 222,323	$ 117,129	$ 219,095	$ 129,342	$ 142,623	$ 202,622	$ 148,380
Earnings per share – basic:
Net income available to Common Shares	$ 0.32	$ 0.58	$ 0.31	$ 0.57	$ 0.34	$ 0.37	$ 0.53	$ 0.39
Weighted average Units outstanding	381,306	380,912	380,795	380,663	380,325	379,906	379,733	379,504
Earnings per share – diluted:
Net income available to Common Shares	$ 0.31	$ 0.58	$ 0.31	$ 0.57	$ 0.34	$ 0.37	$ 0.53	$ 0.39
Weighted average Units outstanding	384,296	383,884	383,423	383,018	383,105	382,945	382,692	382,280

Schedule III - Real Estate an_2

Schedule III - Real Estate and Accumulated Depreciation-Overall Summary (Details)	Dec. 31, 2018USD ($)PropertyApartmentUnit	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Overall summary of real estate and accumulated depreciation
Investment in Real Estate, Gross	$ 26,511,022,000	$ 26,026,896,000	$ 25,386,425,000	$ 28,542,697,000
Accumulated Depreciation	$ (6,696,281,000)	$ (6,040,378,000)	$ (5,360,389,000)	$ (6,084,616,000)
Investment in Real Estate - Wholly Owned Unencumbered [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	240
Units | ApartmentUnit	62,862
Investment in Real Estate, Gross	$ 21,609,130,732
Accumulated Depreciation	(5,400,484,879)
Investment in Real Estate, Net	16,208,645,853
Encumbrances	$ 0
Investment in Real Estate - Wholly Owned Encumbered [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	48
Units | ApartmentUnit	12,140
Investment in Real Estate, Gross	$ 4,023,117,169
Accumulated Depreciation	(1,039,436,780)
Investment in Real Estate, Net	2,983,680,389
Encumbrances	$ 2,081,887,149
Wholly Owned Properties
Overall summary of real estate and accumulated depreciation
Properties | Property	288
Units | ApartmentUnit	75,002
Investment in Real Estate, Gross	$ 25,632,247,901
Accumulated Depreciation	(6,439,921,659)
Investment in Real Estate, Net	19,192,326,242
Encumbrances	$ 2,081,887,149
Investment in Real Estate - Partially Owned Unencumbered [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	9
Units | ApartmentUnit	1,847
Investment in Real Estate, Gross	$ 516,719,235
Accumulated Depreciation	(116,736,579)
Investment in Real Estate, Net	399,982,656
Encumbrances	$ 0
Investment in Real Estate - Partially Owned Encumbered [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	8
Units | ApartmentUnit	1,688
Investment in Real Estate, Gross	$ 362,054,538
Accumulated Depreciation	(139,622,501)
Investment in Real Estate, Net	222,432,037
Encumbrances	$ 303,583,335
NONCONTROLLING INTERESTS - PARTIALLY OWNED PROPERTIES
Overall summary of real estate and accumulated depreciation
Properties | Property	17
Units | ApartmentUnit	3,535
Investment in Real Estate, Gross	$ 878,773,773
Accumulated Depreciation	(256,359,080)
Investment in Real Estate, Net	622,414,693
Encumbrances	$ 303,583,335
Unencumbered Properties [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	249
Units | ApartmentUnit	64,709
Investment in Real Estate, Gross	$ 22,125,849,967
Accumulated Depreciation	(5,517,221,458)
Investment in Real Estate, Net	16,608,628,509
Encumbrances	$ 0
Encumbered Properties [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	56
Units | ApartmentUnit	13,828
Investment in Real Estate, Gross	$ 4,385,171,707
Accumulated Depreciation	(1,179,059,281)
Investment in Real Estate, Net	3,206,112,426
Encumbrances	$ 2,385,470,484
Total Consolidated Investment in Real Estate [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	305
Units | ApartmentUnit	78,537
Investment in Real Estate, Gross	$ 26,511,021,674
Accumulated Depreciation	(6,696,280,739)
Investment in Real Estate, Net	19,814,740,935
Encumbrances	$ 2,385,470,484

Schedule III - Real Estate an_3

Schedule III - Real Estate and Accumulated Depreciation-Encumbrances Reconciliation (Details)	Dec. 31, 2018USD ($)Property
Total Consolidated Investment in Real Estate [Member]
Overall summary of real estate and accumulated depreciation
Encumbrances	$ 2,385,470,484
Archstone Master Property [Member]
Real Estate and Accumulated Depreciation Encumbrances Reconciliation [Abstract]
Number of Properties Encumbered | Property	13
Overall summary of real estate and accumulated depreciation
Encumbrances	$ 797,768,476
Portfolio Entity Encumbrances [Member]
Real Estate and Accumulated Depreciation Encumbrances Reconciliation [Abstract]
Number of Properties Encumbered | Property	13
Portfolio Entity Encumbrances [Member]
Overall summary of real estate and accumulated depreciation
Encumbrances	$ 797,768,476
Individual Property Encumbrances [Member]
Overall summary of real estate and accumulated depreciation
Encumbrances	$ 1,587,702,008

Schedule III - Real Estate an_4

Schedule III - Real Estate and Accumulated Depreciation - Summary of Changes in Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in total real estate
Balance, beginning of year	$ 26,026,896	$ 25,386,425	$ 28,542,697
Acquisitions and development	855,254	710,960	832,803
Improvements	192,661	204,113	174,981
Dispositions and other	(563,789)	(274,602)	(4,164,056)
Balance, end of year	$ 26,511,022	$ 26,026,896	$ 25,386,425

Schedule III - Real Estate an_5

Schedule III - Real Estate and Accumulated Depreciation - Summary of Changes in Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in accumulated depreciation
Balance, beginning of year	$ 6,040,378	$ 5,360,389	$ 6,084,616
Depreciation	785,725	743,749	705,649
Dispositions and other	(129,822)	(63,760)	(1,429,876)
Balance, end of year	$ 6,696,281	$ 6,040,378	$ 5,360,389

Schedule III - Real Estate an_6

Schedule III - Real Estate and Accumulated Depreciation (Details)	12 Months Ended
	Dec. 31, 2018USD ($)ApartmentUnit	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Real Estate And Accumulated Depreciation Abstract
Accumulated Depreciation	$ (6,696,281,000)	$ (6,040,378,000)	$ (5,360,389,000)	$ (6,084,616,000)
100 K Apartments (fka 100K Street) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Washington, D.C.
Real Estate And Accumulated Depreciation Units | ApartmentUnit	222
Initial Cost to Company, Land	$ 15,600,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	69,516,265
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2018, Land	15,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	69,516,265
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	85,116,265
Accumulated Depreciation	(270,039)
Investment in Real Estate, Net	84,846,226
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
140 Riverside Boulevard [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	354
Initial Cost to Company, Land	$ 103,539,100
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	94,082,725
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	9,479,410
Gross Amount Carried at close of period 12/31/2018, Land	103,539,100
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	103,562,135
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	207,101,235
Accumulated Depreciation	(48,691,122)
Investment in Real Estate, Net	158,410,113
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
160 Riverside Boulevard [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	455
Initial Cost to Company, Land	$ 139,933,500
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	190,964,745
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	15,656,370
Gross Amount Carried at close of period 12/31/2018, Land	139,933,500
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	206,621,115
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	346,554,615
Accumulated Depreciation	(96,815,700)
Investment in Real Estate, Net	249,738,915
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
170 Amsterdam [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	236
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	112,096,955
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	235,580
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	112,332,535
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	112,332,535
Accumulated Depreciation	(16,016,094)
Investment in Real Estate, Net	96,316,441
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
175 Kent [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Brooklyn, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	113
Initial Cost to Company, Land	$ 22,037,831
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	53,962,169
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,701,936
Gross Amount Carried at close of period 12/31/2018, Land	22,037,831
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	55,664,105
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	77,701,936
Accumulated Depreciation	(16,317,361)
Investment in Real Estate, Net	61,384,575
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
180 Montague (fka Brooklyn Heights) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Brooklyn, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	193
Initial Cost to Company, Land	$ 32,400,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	92,675,228
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,859,381
Gross Amount Carried at close of period 12/31/2018, Land	32,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	96,534,609
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	128,934,609
Accumulated Depreciation	(23,584,176)
Investment in Real Estate, Net	105,350,433
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
180 Riverside Boulevard [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	516
Initial Cost to Company, Land	$ 144,968,250
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	138,346,681
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	13,831,031
Gross Amount Carried at close of period 12/31/2018, Land	144,968,250
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	152,177,712
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	297,145,962
Accumulated Depreciation	(72,790,895)
Investment in Real Estate, Net	224,355,067
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
1111 Belle Pre (fka The Madison) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Alexandria, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	360
Initial Cost to Company, Land	$ 18,937,702
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	94,758,679
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	278,928
Gross Amount Carried at close of period 12/31/2018, Land	18,937,702
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	95,037,607
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	113,975,309
Accumulated Depreciation	(22,340,533)
Investment in Real Estate, Net	91,634,776
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
1210 Mass [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Washington, D.C.
Real Estate And Accumulated Depreciation Units | ApartmentUnit	144
Initial Cost to Company, Land	$ 9,213,512
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	36,559,189
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,537,398
Gross Amount Carried at close of period 12/31/2018, Land	9,213,512
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	39,096,587
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	48,310,099
Accumulated Depreciation	(18,478,163)
Investment in Real Estate, Net	29,831,936
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
1401 E. Madison [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 10,401,958
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	24,121,307
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2018, Land	10,401,958
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	24,121,307
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	34,523,265
Accumulated Depreciation	0
Investment in Real Estate, Net	34,523,265
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
1500 Mass Ave [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Washington, D.C.
Real Estate And Accumulated Depreciation Units | ApartmentUnit	556
Initial Cost to Company, Land	$ 54,638,298
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	40,361,702
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	15,209,807
Gross Amount Carried at close of period 12/31/2018, Land	54,638,298
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	55,571,509
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	110,209,807
Accumulated Depreciation	(26,934,077)
Investment in Real Estate, Net	83,275,730
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
1800 Oak (fka Rosslyn) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	314
Initial Cost to Company, Land	$ 31,400,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	109,005,734
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,217,218
Gross Amount Carried at close of period 12/31/2018, Land	31,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	115,222,952
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	146,622,952
Accumulated Depreciation	(28,057,310)
Investment in Real Estate, Net	118,565,642
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
2201 Pershing Drive [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	188
Initial Cost to Company, Land	$ 11,321,198
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	49,674,175
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,567,690
Gross Amount Carried at close of period 12/31/2018, Land	11,321,198
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	52,241,865
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	63,563,063
Accumulated Depreciation	(13,457,087)
Investment in Real Estate, Net	50,105,976
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
2201 Wilson [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	219
Initial Cost to Company, Land	$ 21,900,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	78,724,663
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,697,727
Gross Amount Carried at close of period 12/31/2018, Land	21,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	82,422,390
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	104,322,390
Accumulated Depreciation	(20,152,746)
Investment in Real Estate, Net	84,169,644
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
2400 M St [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Washington, D.C.
Real Estate And Accumulated Depreciation Units | ApartmentUnit	359
Initial Cost to Company, Land	$ 30,006,593
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	114,013,785
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,562,289
Gross Amount Carried at close of period 12/31/2018, Land	30,006,593
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	118,576,074
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	148,582,667
Accumulated Depreciation	(53,570,540)
Investment in Real Estate, Net	95,012,127
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
249 Third Street (fka Kendall Square II) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Cambridge, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 4,603,326
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	21,564,301
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2018, Land	4,603,326
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	21,564,301
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	26,167,627
Accumulated Depreciation	0
Investment in Real Estate, Net	26,167,627
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
315 on A [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Boston, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	202
Initial Cost to Company, Land	$ 14,450,070
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	115,824,930
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	766,896
Gross Amount Carried at close of period 12/31/2018, Land	14,450,070
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	116,591,826
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	131,041,896
Accumulated Depreciation	(18,672,172)
Investment in Real Estate, Net	112,369,724
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
340 Fremont (fka Rincon Hill) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Francisco, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	348
Initial Cost to Company, Land	$ 42,000,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	247,811,082
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	92,829
Gross Amount Carried at close of period 12/31/2018, Land	42,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	247,903,911
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	289,903,911
Accumulated Depreciation	(23,751,926)
Investment in Real Estate, Net	266,151,985
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
3003 Van Ness (fka Van Ness) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Washington, D.C.
Real Estate And Accumulated Depreciation Units | ApartmentUnit	625
Initial Cost to Company, Land	$ 56,300,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	141,191,580
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,576,256
Gross Amount Carried at close of period 12/31/2018, Land	56,300,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	147,767,836
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	204,067,836
Accumulated Depreciation	(38,475,875)
Investment in Real Estate, Net	165,591,961
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
45 Worthington (City View II) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Boston, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,644,777
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	2,644,777
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	2,644,777
Accumulated Depreciation	0
Investment in Real Estate, Net	2,644,777
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
425 Mass [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Washington, D.C.
Real Estate And Accumulated Depreciation Units | ApartmentUnit	559
Initial Cost to Company, Land	$ 28,150,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	138,600,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,379,551
Gross Amount Carried at close of period 12/31/2018, Land	28,150,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	142,979,551
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	171,129,551
Accumulated Depreciation	(48,799,382)
Investment in Real Estate, Net	122,330,169
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
455 Eye Street [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Washington, D.C.
Real Estate And Accumulated Depreciation Units | ApartmentUnit	174
Initial Cost to Company, Land	$ 11,941,406
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	61,395,797
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	20,856
Gross Amount Carried at close of period 12/31/2018, Land	11,941,406
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	61,416,653
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	73,358,059
Accumulated Depreciation	(3,530,514)
Investment in Real Estate, Net	69,827,545
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
4701 Willard [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Chevy Chase, MD
Real Estate And Accumulated Depreciation Units | ApartmentUnit	517
Initial Cost to Company, Land	$ 76,921,130
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	153,947,682
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	30,602,147
Gross Amount Carried at close of period 12/31/2018, Land	76,921,130
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	184,549,829
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	261,470,959
Accumulated Depreciation	(58,855,681)
Investment in Real Estate, Net	202,615,278
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
4885 Edgemoor Lane [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Bethesda, MD
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,766,336
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	3,766,336
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	3,766,336
Accumulated Depreciation	0
Investment in Real Estate, Net	3,766,336
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
4th and Hill [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 13,131,456
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	14,133,106
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2018, Land	13,131,456
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	14,133,106
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	27,264,562
Accumulated Depreciation	0
Investment in Real Estate, Net	27,264,562
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
600 Washington [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	135
Initial Cost to Company, Land	$ 32,852,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	43,140,551
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,100,410
Gross Amount Carried at close of period 12/31/2018, Land	32,852,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	44,240,961
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	77,092,961
Accumulated Depreciation	(20,829,342)
Investment in Real Estate, Net	56,263,619
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
660 Washington (fka Boston Common) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Boston, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	420
Initial Cost to Company, Land	$ 106,100,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	166,311,679
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,523,700
Gross Amount Carried at close of period 12/31/2018, Land	106,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	169,835,379
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	275,935,379
Accumulated Depreciation	(41,138,920)
Investment in Real Estate, Net	234,796,459
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
70 Greene [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Jersey City, NJ
Real Estate And Accumulated Depreciation Units | ApartmentUnit	480
Initial Cost to Company, Land	$ 28,108,899
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	236,763,553
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,269,833
Gross Amount Carried at close of period 12/31/2018, Land	28,108,899
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	239,033,386
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	267,142,285
Accumulated Depreciation	(73,802,320)
Investment in Real Estate, Net	193,339,965
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
71 Broadway [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	238
Initial Cost to Company, Land	$ 22,611,600
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	77,492,171
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	15,001,275
Gross Amount Carried at close of period 12/31/2018, Land	22,611,600
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	92,493,446
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	115,105,046
Accumulated Depreciation	(47,229,499)
Investment in Real Estate, Net	67,875,547
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
77 Bluxome [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Francisco, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	102
Initial Cost to Company, Land	$ 5,249,124
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,609,876
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	443,622
Gross Amount Carried at close of period 12/31/2018, Land	5,249,124
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	19,053,498
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	24,302,622
Accumulated Depreciation	(5,793,095)
Investment in Real Estate, Net	18,509,527
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
77 Park Avenue (fka Hoboken) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Hoboken, NJ
Real Estate And Accumulated Depreciation Units | ApartmentUnit	301
Initial Cost to Company, Land	$ 27,900,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	168,992,440
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,604,709
Gross Amount Carried at close of period 12/31/2018, Land	27,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	175,597,149
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	203,497,149
Accumulated Depreciation	(41,358,995)
Investment in Real Estate, Net	162,138,154
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
777 Sixth [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	294
Initial Cost to Company, Land	$ 65,352,706
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	65,747,294
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,014,061
Gross Amount Carried at close of period 12/31/2018, Land	65,352,706
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	69,761,355
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	135,114,061
Accumulated Depreciation	(28,362,079)
Investment in Real Estate, Net	106,751,982
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
88 Hillside [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Daly City, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	95
Initial Cost to Company, Land	$ 7,786,800
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	31,587,325
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,069,561
Gross Amount Carried at close of period 12/31/2018, Land	7,786,800
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	34,656,886
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	42,443,686
Accumulated Depreciation	(10,033,292)
Investment in Real Estate, Net	32,410,394
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
855 Brannan [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Francisco, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	449
Initial Cost to Company, Land	$ 41,363,921
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	280,655,909
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	32,065
Gross Amount Carried at close of period 12/31/2018, Land	41,363,921
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	280,687,974
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	322,051,895
Accumulated Depreciation	(12,233,138)
Investment in Real Estate, Net	309,818,757
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Acappella [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Pasadena, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	143
Initial Cost to Company, Land	$ 5,839,548
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	29,360,452
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,165,266
Gross Amount Carried at close of period 12/31/2018, Land	5,839,548
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	31,525,718
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	37,365,266
Accumulated Depreciation	(11,163,153)
Investment in Real Estate, Net	26,202,113
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Acton Courtyard [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Berkeley, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	71
Initial Cost to Company, Land	$ 5,550,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	15,785,509
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	303,373
Gross Amount Carried at close of period 12/31/2018, Land	5,550,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	16,088,882
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	21,638,882
Accumulated Depreciation	(7,089,343)
Investment in Real Estate, Net	14,549,539
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Alban Towers [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Washington, D.C.
Real Estate And Accumulated Depreciation Units | ApartmentUnit	229
Initial Cost to Company, Land	$ 18,900,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	89,794,201
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,895,344
Gross Amount Carried at close of period 12/31/2018, Land	18,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	94,689,545
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	113,589,545
Accumulated Depreciation	(22,245,031)
Investment in Real Estate, Net	91,344,514
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Alborada [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Fremont, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	442
Initial Cost to Company, Land	$ 24,310,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	59,214,129
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	9,293,818
Gross Amount Carried at close of period 12/31/2018, Land	24,310,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	68,507,947
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	92,817,947
Accumulated Depreciation	(41,761,182)
Investment in Real Estate, Net	51,056,765
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Altitude (fka Village at Howard Hughes, The (Lots 1 & 2)) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	545
Initial Cost to Company, Land	$ 43,783,485
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	148,378,972
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	123,006
Gross Amount Carried at close of period 12/31/2018, Land	43,783,485
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	148,501,978
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	192,285,463
Accumulated Depreciation	(14,509,419)
Investment in Real Estate, Net	177,776,044
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Alton, The (fka Millikan) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Irvine, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	344
Initial Cost to Company, Land	$ 11,049,027
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	95,898,795
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	27,038
Gross Amount Carried at close of period 12/31/2018, Land	11,049,027
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	95,925,833
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	106,974,860
Accumulated Depreciation	(7,393,177)
Investment in Real Estate, Net	99,581,683
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Arbor Terrace [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Sunnyvale, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	175
Initial Cost to Company, Land	$ 9,057,300
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,483,642
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	9,866,646
Gross Amount Carried at close of period 12/31/2018, Land	9,057,300
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	28,350,288
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	37,407,588
Accumulated Depreciation	(16,398,864)
Investment in Real Estate, Net	21,008,724
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Arches,The [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Sunnyvale, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	410
Initial Cost to Company, Land	$ 26,650,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	62,850,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,142,608
Gross Amount Carried at close of period 12/31/2018, Land	26,650,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	64,992,608
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	91,642,608
Accumulated Depreciation	(22,783,366)
Investment in Real Estate, Net	68,859,242
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Artech Building [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Berkeley, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	27
Initial Cost to Company, Land	$ 1,642,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,152,518
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,118,504
Gross Amount Carried at close of period 12/31/2018, Land	1,642,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	11,271,022
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	12,913,022
Accumulated Depreciation	(4,123,265)
Investment in Real Estate, Net	8,789,757
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Artisan on Second [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	118
Initial Cost to Company, Land	$ 8,000,400
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	36,074,600
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,046,371
Gross Amount Carried at close of period 12/31/2018, Land	8,000,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	37,120,971
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,121,371
Accumulated Depreciation	(11,684,515)
Investment in Real Estate, Net	33,436,856
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Artistry Emeryville (fka Emeryville) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Emeryville, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	267
Initial Cost to Company, Land	$ 12,300,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	61,466,267
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,802,555
Gross Amount Carried at close of period 12/31/2018, Land	12,300,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	68,268,822
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	80,568,822
Accumulated Depreciation	(17,833,191)
Investment in Real Estate, Net	62,735,631
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Atelier [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Brooklyn, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	120
Initial Cost to Company, Land	$ 32,401,680
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	47,135,432
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	313,737
Gross Amount Carried at close of period 12/31/2018, Land	32,401,680
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	47,449,169
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	79,850,849
Accumulated Depreciation	(6,648,014)
Investment in Real Estate, Net	73,202,835
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Avanti [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Anaheim, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	162
Initial Cost to Company, Land	$ 12,960,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,497,683
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,876,996
Gross Amount Carried at close of period 12/31/2018, Land	12,960,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	22,374,679
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,334,679
Accumulated Depreciation	(10,360,476)
Investment in Real Estate, Net	24,974,203
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Avenue Two [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Redwood City, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	123
Initial Cost to Company, Land	$ 7,995,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,005,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,385,284
Gross Amount Carried at close of period 12/31/2018, Land	7,995,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	20,390,284
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	28,385,284
Accumulated Depreciation	(6,758,825)
Investment in Real Estate, Net	21,626,459
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Azure (fka Mission Bay-Block 13) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Francisco, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	273
Initial Cost to Company, Land	$ 32,855,115
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	152,628,044
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	201,962
Gross Amount Carried at close of period 12/31/2018, Land	32,855,115
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	152,830,006
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	185,685,121
Accumulated Depreciation	(19,304,541)
Investment in Real Estate, Net	166,380,580
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Bay Hill [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Long Beach, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	160
Initial Cost to Company, Land	$ 7,600,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	27,437,239
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,501,456
Gross Amount Carried at close of period 12/31/2018, Land	7,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	30,938,695
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	38,538,695
Accumulated Depreciation	(15,493,308)
Investment in Real Estate, Net	23,045,387
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Beatrice, The [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	302
Initial Cost to Company, Land	$ 114,351,405
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	165,648,595
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,583,190
Gross Amount Carried at close of period 12/31/2018, Land	114,351,405
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	167,231,785
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	281,583,190
Accumulated Depreciation	(46,223,187)
Investment in Real Estate, Net	235,360,003
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Belle Arts Condominium Homes, LLC [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Bellevue, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	1
Initial Cost to Company, Land	$ 63,158
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	236,157
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,098
Gross Amount Carried at close of period 12/31/2018, Land	63,158
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	238,255
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	301,413
Accumulated Depreciation	(83,348)
Investment in Real Estate, Net	218,065
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Bella Fontaine [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Marina Del Rey, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	102
Initial Cost to Company, Land	$ 9,098,808
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	28,701,192
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,277,604
Gross Amount Carried at close of period 12/31/2018, Land	9,098,808
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	29,978,796
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	39,077,604
Accumulated Depreciation	(8,865,592)
Investment in Real Estate, Net	30,212,012
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Breakwater at Marina Del Rey [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Marina Del Rey, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	224
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	73,189,262
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,103,728
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	75,292,990
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	75,292,990
Accumulated Depreciation	(19,870,053)
Investment in Real Estate, Net	55,422,937
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Briarwood (CA) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Sunnyvale, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	192
Initial Cost to Company, Land	$ 9,991,500
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	22,247,278
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,121,529
Gross Amount Carried at close of period 12/31/2018, Land	9,991,500
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,368,807
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	36,360,307
Accumulated Depreciation	(17,956,685)
Investment in Real Estate, Net	18,403,622
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Bridford Lakes II [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Greensboro, NC
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 200,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2018, Land	200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	200,000
Accumulated Depreciation	0
Investment in Real Estate, Net	200,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Brooklyner (fka 111 Lawrence) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Brooklyn, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	490
Initial Cost to Company, Land	$ 40,099,922
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	221,438,631
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,760,049
Gross Amount Carried at close of period 12/31/2018, Land	40,099,922
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	225,198,680
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	265,298,602
Accumulated Depreciation	(61,813,037)
Investment in Real Estate, Net	203,485,565
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
C on Pico [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	94
Initial Cost to Company, Land	$ 17,125,766
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	28,074,234
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	192,535
Gross Amount Carried at close of period 12/31/2018, Land	17,125,766
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	28,266,769
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,392,535
Accumulated Depreciation	(3,822,366)
Investment in Real Estate, Net	41,570,169
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Carlyle Mill [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Alexandria, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	317
Initial Cost to Company, Land	$ 10,000,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	51,367,913
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	8,584,023
Gross Amount Carried at close of period 12/31/2018, Land	10,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	59,951,936
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	69,951,936
Accumulated Depreciation	(32,763,420)
Investment in Real Estate, Net	37,188,516
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Carmel Terrace [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Diego, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	384
Initial Cost to Company, Land	$ 2,288,300
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	20,596,281
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	12,173,035
Gross Amount Carried at close of period 12/31/2018, Land	2,288,300
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	32,769,316
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,057,616
Accumulated Depreciation	(27,594,760)
Investment in Real Estate, Net	7,462,856
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Cascade [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	477
Initial Cost to Company, Land	$ 23,751,564
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	148,150,309
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,109
Gross Amount Carried at close of period 12/31/2018, Land	23,751,564
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	148,151,418
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	171,902,982
Accumulated Depreciation	(8,307,229)
Investment in Real Estate, Net	163,595,753
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Centennial (fka Centennial Court & Centennial Tower) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	408
Initial Cost to Company, Land	$ 9,700,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	70,080,378
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	12,240,924
Gross Amount Carried at close of period 12/31/2018, Land	9,700,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	82,321,302
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	92,021,302
Accumulated Depreciation	(40,391,210)
Investment in Real Estate, Net	51,630,092
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Centre Club Combined [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Ontario, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	412
Initial Cost to Company, Land	$ 7,436,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	33,014,789
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	9,207,501
Gross Amount Carried at close of period 12/31/2018, Land	7,436,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	42,222,290
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	49,658,290
Accumulated Depreciation	(24,948,636)
Investment in Real Estate, Net	24,709,654
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Chloe [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	117
Initial Cost to Company, Land	$ 14,835,571
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	39,359,650
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	628,879
Gross Amount Carried at close of period 12/31/2018, Land	14,835,571
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	39,988,529
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	54,824,100
Accumulated Depreciation	(2,779,352)
Investment in Real Estate, Net	52,044,748
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Church Corner [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Cambridge, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	85
Initial Cost to Company, Land	$ 5,220,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	16,744,643
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,104,358
Gross Amount Carried at close of period 12/31/2018, Land	5,220,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	19,849,001
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	25,069,001
Accumulated Depreciation	(10,167,185)
Investment in Real Estate, Net	14,901,816
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
City Gate at Cupertino (fka Cupertino) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Cupertino, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	311
Initial Cost to Company, Land	$ 40,400,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	95,937,046
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	7,410,552
Gross Amount Carried at close of period 12/31/2018, Land	40,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	103,347,598
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	143,747,598
Accumulated Depreciation	(25,436,921)
Investment in Real Estate, Net	118,310,677
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
City Pointe [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Fullerton, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	183
Initial Cost to Company, Land	$ 6,863,792
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	36,476,208
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,047,704
Gross Amount Carried at close of period 12/31/2018, Land	6,863,792
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	38,523,912
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,387,704
Accumulated Depreciation	(14,150,420)
Investment in Real Estate, Net	31,237,284
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
City Square Bellevue (fka Bellevue) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Bellevue, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	191
Initial Cost to Company, Land	$ 15,100,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	41,876,257
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,476,525
Gross Amount Carried at close of period 12/31/2018, Land	15,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	45,352,782
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	60,452,782
Accumulated Depreciation	(11,624,754)
Investment in Real Estate, Net	48,828,028
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
CityView at Longwood [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Boston, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	295
Initial Cost to Company, Land	$ 14,704,898
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	79,195,102
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	13,594,830
Gross Amount Carried at close of period 12/31/2018, Land	14,704,898
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	92,789,932
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	107,494,830
Accumulated Depreciation	(33,266,169)
Investment in Real Estate, Net	74,228,661
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Clarendon, The [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	292
Initial Cost to Company, Land	$ 30,400,340
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	103,824,660
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,390,107
Gross Amount Carried at close of period 12/31/2018, Land	30,400,340
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	106,214,767
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	136,615,107
Accumulated Depreciation	(33,551,922)
Investment in Real Estate, Net	103,063,185
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Cleo, The [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	92
Initial Cost to Company, Land	$ 6,615,467
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	14,829,335
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,945,639
Gross Amount Carried at close of period 12/31/2018, Land	6,615,467
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,774,974
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	25,390,441
Accumulated Depreciation	(9,223,334)
Investment in Real Estate, Net	16,167,107
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Connecticut Heights [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Washington, D.C.
Real Estate And Accumulated Depreciation Units | ApartmentUnit	518
Initial Cost to Company, Land	$ 27,600,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	114,002,295
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	9,236,604
Gross Amount Carried at close of period 12/31/2018, Land	27,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	123,238,899
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	150,838,899
Accumulated Depreciation	(29,100,080)
Investment in Real Estate, Net	121,738,819
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Corcoran House at DuPont Circle (fka DuPont Circle) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Washington, D.C.
Real Estate And Accumulated Depreciation Units | ApartmentUnit	138
Initial Cost to Company, Land	$ 13,500,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	26,913,113
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,945,268
Gross Amount Carried at close of period 12/31/2018, Land	13,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	28,858,381
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	42,358,381
Accumulated Depreciation	(7,970,206)
Investment in Real Estate, Net	34,388,175
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Courthouse Plaza [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	396
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	87,386,024
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,810,948
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	93,196,972
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	93,196,972
Accumulated Depreciation	(25,008,039)
Investment in Real Estate, Net	68,188,933
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Creekside (San Mateo) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Mateo, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	192
Initial Cost to Company, Land	$ 9,606,600
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	21,193,231
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,714,294
Gross Amount Carried at close of period 12/31/2018, Land	9,606,600
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	25,907,525
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,514,125
Accumulated Depreciation	(17,827,109)
Investment in Real Estate, Net	17,687,016
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Cronins Landing [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Waltham, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	281
Initial Cost to Company, Land	$ 32,300,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	85,119,324
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	9,986,941
Gross Amount Carried at close of period 12/31/2018, Land	32,300,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	95,106,265
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	127,406,265
Accumulated Depreciation	(23,112,933)
Investment in Real Estate, Net	104,293,332
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Crystal Place [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	181
Initial Cost to Company, Land	$ 17,200,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	47,918,975
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,799,780
Gross Amount Carried at close of period 12/31/2018, Land	17,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	51,718,755
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	68,918,755
Accumulated Depreciation	(13,497,731)
Investment in Real Estate, Net	55,421,024
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Deerwood (SD)
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Diego, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	316
Initial Cost to Company, Land	$ 2,082,095
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,739,815
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	15,328,542
Gross Amount Carried at close of period 12/31/2018, Land	2,082,095
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	34,068,357
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	36,150,452
Accumulated Depreciation	(29,457,997)
Investment in Real Estate, Net	6,692,455
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Del Mar Ridge [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Diego, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	181
Initial Cost to Company, Land	$ 7,801,824
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	36,948,176
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,997,663
Gross Amount Carried at close of period 12/31/2018, Land	7,801,824
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	40,945,839
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	48,747,663
Accumulated Depreciation	(16,173,191)
Investment in Real Estate, Net	32,574,472
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Eagle Canyon [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Chino Hills, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	252
Initial Cost to Company, Land	$ 1,808,900
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	16,274,361
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	10,216,962
Gross Amount Carried at close of period 12/31/2018, Land	1,808,900
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,491,323
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	28,300,223
Accumulated Depreciation	(19,595,575)
Investment in Real Estate, Net	8,704,648
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Edgemont at Bethesda Metro [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Bethesda, MD
Real Estate And Accumulated Depreciation Units | ApartmentUnit	122
Initial Cost to Company, Land	$ 13,092,552
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	43,907,448
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,570,420
Gross Amount Carried at close of period 12/31/2018, Land	13,092,552
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	45,477,868
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	58,570,420
Accumulated Depreciation	(13,558,521)
Investment in Real Estate, Net	45,011,899
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Elevé [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Glendale, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	208
Initial Cost to Company, Land	$ 14,080,560
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	56,419,440
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	741,173
Gross Amount Carried at close of period 12/31/2018, Land	14,080,560
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	57,160,613
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	71,241,173
Accumulated Depreciation	(12,317,955)
Investment in Real Estate, Net	58,923,218
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Emerson Place [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Boston, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	444
Initial Cost to Company, Land	$ 14,855,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	57,566,636
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	31,456,250
Gross Amount Carried at close of period 12/31/2018, Land	14,855,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	89,022,886
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	103,877,886
Accumulated Depreciation	(59,097,457)
Investment in Real Estate, Net	44,780,429
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Encore at Sherman Oaks, The [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Sherman Oaks, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	174
Initial Cost to Company, Land	$ 8,700,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	25,446,003
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,240,556
Gross Amount Carried at close of period 12/31/2018, Land	8,700,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,686,559
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	36,386,559
Accumulated Depreciation	(9,771,700)
Investment in Real Estate, Net	26,614,859
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Fountains at Emerald Park (fka Emerald Park) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Dublin, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	324
Initial Cost to Company, Land	$ 25,900,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	83,986,217
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,547,788
Gross Amount Carried at close of period 12/31/2018, Land	25,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	86,534,005
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	112,434,005
Accumulated Depreciation	(22,068,994)
Investment in Real Estate, Net	90,365,011
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Fremont Center [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Fremont, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	322
Initial Cost to Company, Land	$ 25,800,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	78,753,114
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,235,681
Gross Amount Carried at close of period 12/31/2018, Land	25,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	82,988,795
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	108,788,795
Accumulated Depreciation	(21,299,475)
Investment in Real Estate, Net	87,489,320
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Gallery, The [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Hermosa Beach, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	169
Initial Cost to Company, Land	$ 18,144,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	46,567,941
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,905,707
Gross Amount Carried at close of period 12/31/2018, Land	18,144,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	49,473,648
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	67,617,648
Accumulated Depreciation	(23,145,881)
Investment in Real Estate, Net	44,471,767
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Gateway at Malden Center [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Malden, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	203
Initial Cost to Company, Land	$ 9,209,780
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	25,722,666
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	15,394,618
Gross Amount Carried at close of period 12/31/2018, Land	9,209,780
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	41,117,284
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	50,327,064
Accumulated Depreciation	(24,990,335)
Investment in Real Estate, Net	25,336,729
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Geary Court Yard [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Francisco, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	164
Initial Cost to Company, Land	$ 1,722,400
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	15,471,429
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,447,819
Gross Amount Carried at close of period 12/31/2018, Land	1,722,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	20,919,248
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	22,641,648
Accumulated Depreciation	(14,374,505)
Investment in Real Estate, Net	8,267,143
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Girard [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Boston, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	160
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	102,450,328
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	792,675
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	103,243,003
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	103,243,003
Accumulated Depreciation	(7,551,227)
Investment in Real Estate, Net	95,691,776
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Hampshire Place [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	259
Initial Cost to Company, Land	$ 10,806,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	30,335,330
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,750,493
Gross Amount Carried at close of period 12/31/2018, Land	10,806,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	37,085,823
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	47,891,823
Accumulated Depreciation	(18,306,144)
Investment in Real Estate, Net	29,585,679
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Harbor Steps [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	758
Initial Cost to Company, Land	$ 59,403,601
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	158,829,432
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	35,187,525
Gross Amount Carried at close of period 12/31/2018, Land	59,403,601
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	194,016,957
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	253,420,558
Accumulated Depreciation	(88,466,202)
Investment in Real Estate, Net	164,954,356
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Heights on Capitol Hill [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	104
Initial Cost to Company, Land	$ 5,425,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	21,138,028
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,757,739
Gross Amount Carried at close of period 12/31/2018, Land	5,425,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	22,895,767
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	28,320,767
Accumulated Depreciation	(9,916,225)
Investment in Real Estate, Net	18,404,542
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Helios (fka 2nd+Pine) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	398
Initial Cost to Company, Land	$ 18,061,674
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	206,297,144
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	14,831
Gross Amount Carried at close of period 12/31/2018, Land	18,061,674
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	206,311,975
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	224,373,649
Accumulated Depreciation	(11,942,676)
Investment in Real Estate, Net	212,430,973
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Heritage at Stone Ridge [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Burlington, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	180
Initial Cost to Company, Land	$ 10,800,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	31,808,335
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,560,256
Gross Amount Carried at close of period 12/31/2018, Land	10,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	34,368,591
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,168,591
Accumulated Depreciation	(16,558,111)
Investment in Real Estate, Net	28,610,480
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Heritage Ridge [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Lynwood, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	197
Initial Cost to Company, Land	$ 6,895,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,983,597
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,341,551
Gross Amount Carried at close of period 12/31/2018, Land	6,895,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	23,325,148
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	30,220,148
Accumulated Depreciation	(10,981,639)
Investment in Real Estate, Net	19,238,509
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Hesby [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	North Hollywood, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	308
Initial Cost to Company, Land	$ 23,299,892
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	102,700,108
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,045,443
Gross Amount Carried at close of period 12/31/2018, Land	23,299,892
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	103,745,551
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	127,045,443
Accumulated Depreciation	(21,321,630)
Investment in Real Estate, Net	105,723,813
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Highlands at South Plainfield [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	South Plainfield, NJ
Real Estate And Accumulated Depreciation Units | ApartmentUnit	252
Initial Cost to Company, Land	$ 10,080,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	37,526,912
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,174,172
Gross Amount Carried at close of period 12/31/2018, Land	10,080,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	39,701,084
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	49,781,084
Accumulated Depreciation	(18,721,344)
Investment in Real Estate, Net	31,059,740
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Hikari [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	128
Initial Cost to Company, Land	$ 9,435,760
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	32,564,240
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	924,031
Gross Amount Carried at close of period 12/31/2018, Land	9,435,760
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	33,488,271
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	42,924,031
Accumulated Depreciation	(10,500,837)
Investment in Real Estate, Net	32,423,194
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Hudson Crossing [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	259
Initial Cost to Company, Land	$ 23,420,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	69,977,699
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,641,742
Gross Amount Carried at close of period 12/31/2018, Land	23,420,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	72,619,441
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	96,039,441
Accumulated Depreciation	(35,972,698)
Investment in Real Estate, Net	60,066,743
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Hudson Pointe [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Jersey City, NJ
Real Estate And Accumulated Depreciation Units | ApartmentUnit	182
Initial Cost to Company, Land	$ 5,350,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	41,114,074
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,559,255
Gross Amount Carried at close of period 12/31/2018, Land	5,350,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	47,673,329
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	53,023,329
Accumulated Depreciation	(24,093,676)
Investment in Real Estate, Net	28,929,653
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Hunt Club II [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Charlotte, NC
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 100,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2018, Land	100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	100,000
Accumulated Depreciation	0
Investment in Real Estate, Net	100,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Ivory Wood [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Bothell, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	144
Initial Cost to Company, Land	$ 2,732,800
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	13,888,282
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,470,190
Gross Amount Carried at close of period 12/31/2018, Land	2,732,800
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	15,358,472
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	18,091,272
Accumulated Depreciation	(7,954,981)
Investment in Real Estate, Net	10,136,291
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Jia [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	280
Initial Cost to Company, Land	$ 14,791,831
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	77,708,868
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	400,967
Gross Amount Carried at close of period 12/31/2018, Land	14,791,831
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	78,109,835
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	92,901,666
Accumulated Depreciation	(19,685,769)
Investment in Real Estate, Net	73,215,897
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Junction 47 (fka West Seattle) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	206
Initial Cost to Company, Land	$ 11,726,305
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	56,246,557
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	110,852
Gross Amount Carried at close of period 12/31/2018, Land	11,726,305
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	56,357,409
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	68,083,714
Accumulated Depreciation	(7,480,950)
Investment in Real Estate, Net	60,602,764
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Kelvin, The (fka Modera) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Irvine, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	194
Initial Cost to Company, Land	$ 15,521,552
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	64,853,448
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	520,485
Gross Amount Carried at close of period 12/31/2018, Land	15,521,552
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	65,373,933
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	80,895,485
Accumulated Depreciation	(10,153,159)
Investment in Real Estate, Net	70,742,326
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Kenwood Mews [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Burbank, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	141
Initial Cost to Company, Land	$ 14,100,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	24,662,883
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,006,944
Gross Amount Carried at close of period 12/31/2018, Land	14,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	28,669,827
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	42,769,827
Accumulated Depreciation	(13,857,402)
Investment in Real Estate, Net	28,912,425
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Laguna Clara [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Santa Clara, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	264
Initial Cost to Company, Land	$ 13,642,420
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	28,128,260
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,050,290
Gross Amount Carried at close of period 12/31/2018, Land	13,642,420
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	33,178,550
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	46,820,970
Accumulated Depreciation	(18,704,128)
Investment in Real Estate, Net	28,116,842
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Landings at Port Imperial [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	W. New York, NJ
Real Estate And Accumulated Depreciation Units | ApartmentUnit	276
Initial Cost to Company, Land	$ 27,246,045
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	37,741,050
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	12,850,243
Gross Amount Carried at close of period 12/31/2018, Land	27,246,045
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	50,591,293
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	77,837,338
Accumulated Depreciation	(31,145,964)
Investment in Real Estate, Net	46,691,374
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Liberty Tower [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	235
Initial Cost to Company, Land	$ 16,382,822
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	83,817,078
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,105,715
Gross Amount Carried at close of period 12/31/2018, Land	16,382,822
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	85,922,793
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	102,305,615
Accumulated Depreciation	(28,986,710)
Investment in Real Estate, Net	73,318,905
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Lincoln Heights [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Quincy, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	336
Initial Cost to Company, Land	$ 5,928,400
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	33,595,262
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	14,626,711
Gross Amount Carried at close of period 12/31/2018, Land	5,928,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	48,221,973
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	54,150,373
Accumulated Depreciation	(36,031,322)
Investment in Real Estate, Net	18,119,051
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Lindley Apartments [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Encino, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	129
Initial Cost to Company, Land	$ 5,805,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	25,705,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,577,513
Gross Amount Carried at close of period 12/31/2018, Land	5,805,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,282,513
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	33,087,513
Accumulated Depreciation	(9,306,827)
Investment in Real Estate, Net	23,780,686
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Loft 590 [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	212
Initial Cost to Company, Land	$ 20,100,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	67,909,023
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	732,963
Gross Amount Carried at close of period 12/31/2018, Land	20,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	68,641,986
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	88,741,986
Accumulated Depreciation	(16,094,383)
Investment in Real Estate, Net	72,647,603
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Lofts at Kendall Square (fka Kendall Square) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Cambridge, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	186
Initial Cost to Company, Land	$ 18,696,674
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	78,445,657
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,554,452
Gross Amount Carried at close of period 12/31/2018, Land	18,696,674
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	85,000,109
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	103,696,783
Accumulated Depreciation	(20,874,720)
Investment in Real Estate, Net	82,822,063
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Longacre House [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	293
Initial Cost to Company, Land	$ 73,170,045
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	53,962,510
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,845,833
Gross Amount Carried at close of period 12/31/2018, Land	73,170,045
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	57,808,343
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	130,978,388
Accumulated Depreciation	(24,364,056)
Investment in Real Estate, Net	106,614,332
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Longfellow Place [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Boston, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	710
Initial Cost to Company, Land	$ 38,264,917
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	132,175,915
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	82,037,087
Gross Amount Carried at close of period 12/31/2018, Land	38,264,917
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	214,213,002
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	252,477,919
Accumulated Depreciation	(143,886,095)
Investment in Real Estate, Net	108,591,824
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Longview Place [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Waltham, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	348
Initial Cost to Company, Land	$ 20,880,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	90,255,509
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	7,188,625
Gross Amount Carried at close of period 12/31/2018, Land	20,880,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	97,444,134
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	118,324,134
Accumulated Depreciation	(45,368,039)
Investment in Real Estate, Net	72,956,095
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Mantena [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	98
Initial Cost to Company, Land	$ 22,346,513
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	61,501,158
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	942,456
Gross Amount Carried at close of period 12/31/2018, Land	22,346,513
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	62,443,614
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	84,790,127
Accumulated Depreciation	(15,923,495)
Investment in Real Estate, Net	68,866,632
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Marina 41 (fka Marina Del Rey) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Marina Del Rey, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	623
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	168,842,442
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	8,397,509
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	177,239,951
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	177,239,951
Accumulated Depreciation	(47,146,998)
Investment in Real Estate, Net	130,092,953
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Mariposa at Playa Del Rey (fka Playa Del Rey) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Playa Del Rey, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	354
Initial Cost to Company, Land	$ 60,900,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	89,311,482
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,580,206
Gross Amount Carried at close of period 12/31/2018, Land	60,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	94,891,688
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	155,791,688
Accumulated Depreciation	(24,699,526)
Investment in Real Estate, Net	131,092,162
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Market Street Village [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Diego, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	229
Initial Cost to Company, Land	$ 13,740,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	40,757,301
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,328,664
Gross Amount Carried at close of period 12/31/2018, Land	13,740,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	43,085,965
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	56,825,965
Accumulated Depreciation	(19,556,103)
Investment in Real Estate, Net	37,269,862
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Metro on First [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	102
Initial Cost to Company, Land	$ 8,540,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	12,209,981
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,362,369
Gross Amount Carried at close of period 12/31/2018, Land	8,540,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	14,572,350
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	23,112,350
Accumulated Depreciation	(6,573,840)
Investment in Real Estate, Net	16,538,510
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Milano Lofts [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	99
Initial Cost to Company, Land	$ 8,125,216
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	27,378,784
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,883,991
Gross Amount Carried at close of period 12/31/2018, Land	8,125,216
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	30,262,775
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	38,387,991
Accumulated Depreciation	(8,050,414)
Investment in Real Estate, Net	30,337,577
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Montierra (CA) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Diego, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	272
Initial Cost to Company, Land	$ 8,160,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	29,360,938
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	8,205,107
Gross Amount Carried at close of period 12/31/2018, Land	8,160,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	37,566,045
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,726,045
Accumulated Depreciation	(25,291,041)
Investment in Real Estate, Net	20,435,004
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Mosaic at Metro [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Hyattsville, MD
Real Estate And Accumulated Depreciation Units | ApartmentUnit	260
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	59,580,898
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,270,920
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	60,851,818
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	60,851,818
Accumulated Depreciation	(21,513,518)
Investment in Real Estate, Net	39,338,300
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Mountain View Redevelopment [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Mountain View, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	160,996
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	160,996
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	160,996
Accumulated Depreciation	0
Investment in Real Estate, Net	160,996
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Mozaic at Union Station [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	272
Initial Cost to Company, Land	$ 8,500,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	52,529,446
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,384,578
Gross Amount Carried at close of period 12/31/2018, Land	8,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	54,914,024
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	63,414,024
Accumulated Depreciation	(24,082,672)
Investment in Real Estate, Net	39,331,352
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Murray Hill Tower (fka Murray Hill) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	270
Initial Cost to Company, Land	$ 75,800,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	102,705,401
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	9,551,107
Gross Amount Carried at close of period 12/31/2018, Land	75,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	112,256,508
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	188,056,508
Accumulated Depreciation	(30,064,769)
Investment in Real Estate, Net	157,991,739
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
North Pier at Harborside [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Jersey City, NJ
Real Estate And Accumulated Depreciation Units | ApartmentUnit	297
Initial Cost to Company, Land	$ 4,000,159
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	94,290,590
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,743,836
Gross Amount Carried at close of period 12/31/2018, Land	4,000,159
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	99,034,426
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	103,034,585
Accumulated Depreciation	(49,673,731)
Investment in Real Estate, Net	53,360,854
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Northglen [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Valencia, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	234
Initial Cost to Company, Land	$ 9,360,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	20,778,553
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,764,419
Gross Amount Carried at close of period 12/31/2018, Land	9,360,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,542,972
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,902,972
Accumulated Depreciation	(15,274,806)
Investment in Real Estate, Net	20,628,166
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Northpark [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Burlingame, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	510
Initial Cost to Company, Land	$ 38,607,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	77,472,217
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	14,751,585
Gross Amount Carried at close of period 12/31/2018, Land	38,607,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	92,223,802
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	130,830,802
Accumulated Depreciation	(36,348,320)
Investment in Real Estate, Net	94,482,482
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Northridge [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Pleasant Hill, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	221
Initial Cost to Company, Land	$ 5,524,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	14,691,705
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	11,428,402
Gross Amount Carried at close of period 12/31/2018, Land	5,524,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,120,107
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	31,644,107
Accumulated Depreciation	(19,830,954)
Investment in Real Estate, Net	11,813,153
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Oak Park Combined [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Agoura Hills, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	444
Initial Cost to Company, Land	$ 3,390,700
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	30,517,274
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	10,707,930
Gross Amount Carried at close of period 12/31/2018, Land	3,390,700
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	41,225,204
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	44,615,904
Accumulated Depreciation	(31,925,485)
Investment in Real Estate, Net	12,690,419
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Oaks [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Santa Clarita, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	520
Initial Cost to Company, Land	$ 23,400,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	61,020,438
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,184,215
Gross Amount Carried at close of period 12/31/2018, Land	23,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	67,204,653
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	90,604,653
Accumulated Depreciation	(36,500,570)
Investment in Real Estate, Net	54,104,083
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Oakwood Crystal City [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	162
Initial Cost to Company, Land	$ 15,400,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	35,474,336
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,071,719
Gross Amount Carried at close of period 12/31/2018, Land	15,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	39,546,055
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	54,946,055
Accumulated Depreciation	(10,060,766)
Investment in Real Estate, Net	44,885,289
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Ocean Crest [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Solana Beach, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	146
Initial Cost to Company, Land	$ 5,111,200
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,910,438
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,523,128
Gross Amount Carried at close of period 12/31/2018, Land	5,111,200
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	16,433,566
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	21,544,766
Accumulated Depreciation	(11,149,744)
Investment in Real Estate, Net	10,395,022
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Odin (fka Tallman) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	301
Initial Cost to Company, Land	$ 16,807,519
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	63,651,394
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	43,186
Gross Amount Carried at close of period 12/31/2018, Land	16,807,519
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	63,694,580
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	80,502,099
Accumulated Depreciation	(8,420,800)
Investment in Real Estate, Net	72,081,299
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Old Town Lofts [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Redmond, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	149
Initial Cost to Company, Land	$ 7,740,467
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	44,146,181
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	802,966
Gross Amount Carried at close of period 12/31/2018, Land	7,740,467
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	44,949,147
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	52,689,614
Accumulated Depreciation	(6,895,004)
Investment in Real Estate, Net	45,794,610
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
One Henry Adams [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Francisco, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	241
Initial Cost to Company, Land	$ 30,224,393
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	138,212,568
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	10,366
Gross Amount Carried at close of period 12/31/2018, Land	30,224,393
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	138,222,934
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	168,447,327
Accumulated Depreciation	(10,939,933)
Investment in Real Estate, Net	157,507,394
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
One India Street (fka Oakwood Boston) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Boston, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	94
Initial Cost to Company, Land	$ 22,200,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	28,672,979
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,346,235
Gross Amount Carried at close of period 12/31/2018, Land	22,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	32,019,214
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	54,219,214
Accumulated Depreciation	(8,203,480)
Investment in Real Estate, Net	46,015,734
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Pacific Place [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	430
Initial Cost to Company, Land	$ 32,250,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	110,750,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,796,632
Gross Amount Carried at close of period 12/31/2018, Land	32,250,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	112,546,632
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	144,796,632
Accumulated Depreciation	(27,949,911)
Investment in Real Estate, Net	116,846,721
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Packard Building [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	61
Initial Cost to Company, Land	$ 5,911,041
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	19,954,959
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	691,363
Gross Amount Carried at close of period 12/31/2018, Land	5,911,041
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	20,646,322
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	26,557,363
Accumulated Depreciation	(3,017,526)
Investment in Real Estate, Net	23,539,837
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Parc 77 [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	137
Initial Cost to Company, Land	$ 40,504,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,025,679
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,345,232
Gross Amount Carried at close of period 12/31/2018, Land	40,504,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	24,370,911
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	64,874,911
Accumulated Depreciation	(13,224,242)
Investment in Real Estate, Net	51,650,669
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Parc Cameron [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	166
Initial Cost to Company, Land	$ 37,600,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,855,597
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	7,488,875
Gross Amount Carried at close of period 12/31/2018, Land	37,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	17,344,472
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	54,944,472
Accumulated Depreciation	(11,104,877)
Investment in Real Estate, Net	43,839,595
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Parc Coliseum [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	177
Initial Cost to Company, Land	$ 52,654,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	23,045,751
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	9,179,112
Gross Amount Carried at close of period 12/31/2018, Land	52,654,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	32,224,863
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	84,878,863
Accumulated Depreciation	(18,199,716)
Investment in Real Estate, Net	66,679,147
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Parc East Towers [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	324
Initial Cost to Company, Land	$ 102,163,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	108,989,402
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	10,892,394
Gross Amount Carried at close of period 12/31/2018, Land	102,163,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	119,881,796
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	222,044,796
Accumulated Depreciation	(52,426,236)
Investment in Real Estate, Net	169,618,560
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Parc on Powell (fka Parkside at Emeryville) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Emeryville, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	173
Initial Cost to Company, Land	$ 16,667,059
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	65,073,509
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	212,580
Gross Amount Carried at close of period 12/31/2018, Land	16,667,059
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	65,286,089
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	81,953,148
Accumulated Depreciation	(9,333,810)
Investment in Real Estate, Net	72,619,338
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Park at Pentagon Row (fka Pentagon City) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	298
Initial Cost to Company, Land	$ 28,300,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	78,838,184
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,436,695
Gross Amount Carried at close of period 12/31/2018, Land	28,300,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	81,274,879
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	109,574,879
Accumulated Depreciation	(20,074,236)
Investment in Real Estate, Net	89,500,643
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Park Connecticut [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Washington, D.C.
Real Estate And Accumulated Depreciation Units | ApartmentUnit	142
Initial Cost to Company, Land	$ 13,700,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	59,087,519
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,663,394
Gross Amount Carried at close of period 12/31/2018, Land	13,700,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	60,750,913
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	74,450,913
Accumulated Depreciation	(14,438,751)
Investment in Real Estate, Net	60,012,162
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Park Hacienda (fka Hacienda) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Pleasanton, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	540
Initial Cost to Company, Land	$ 43,200,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	128,753,359
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,858,184
Gross Amount Carried at close of period 12/31/2018, Land	43,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	133,611,543
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	176,811,543
Accumulated Depreciation	(34,884,871)
Investment in Real Estate, Net	141,926,672
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Park West (CA) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	444
Initial Cost to Company, Land	$ 3,033,500
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	27,302,383
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	11,262,203
Gross Amount Carried at close of period 12/31/2018, Land	3,033,500
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	38,564,586
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	41,598,086
Accumulated Depreciation	(29,343,622)
Investment in Real Estate, Net	12,254,464
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Parkside [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Union City, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	208
Initial Cost to Company, Land	$ 6,246,700
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,827,453
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	7,163,451
Gross Amount Carried at close of period 12/31/2018, Land	6,246,700
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,990,904
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	25,237,604
Accumulated Depreciation	(12,327,804)
Investment in Real Estate, Net	12,909,800
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Pearl, The (WA) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	80
Initial Cost to Company, Land	$ 6,972,585
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	26,527,415
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	999,509
Gross Amount Carried at close of period 12/31/2018, Land	6,972,585
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,526,924
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	34,499,509
Accumulated Depreciation	(3,981,489)
Investment in Real Estate, Net	30,518,020
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Pearl MDR (fka Oakwood Marina Del Rey) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Marina Del Rey, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	597
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	120,795,359
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,778,318
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	125,573,677
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	125,573,677
Accumulated Depreciation	(33,800,305)
Investment in Real Estate, Net	91,773,372
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Pegasus [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	322
Initial Cost to Company, Land	$ 18,094,052
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	81,905,948
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,080,345
Gross Amount Carried at close of period 12/31/2018, Land	18,094,052
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	87,986,293
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	106,080,345
Accumulated Depreciation	(29,282,736)
Investment in Real Estate, Net	76,797,609
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Playa Pacifica [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Hermosa Beach, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	285
Initial Cost to Company, Land	$ 35,100,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	33,473,822
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	23,015,281
Gross Amount Carried at close of period 12/31/2018, Land	35,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	56,489,103
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	91,589,103
Accumulated Depreciation	(28,347,617)
Investment in Real Estate, Net	63,241,486
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Portofino [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Chino Hills, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	176
Initial Cost to Company, Land	$ 3,572,400
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	14,660,994
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,777,392
Gross Amount Carried at close of period 12/31/2018, Land	3,572,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,438,386
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	22,010,786
Accumulated Depreciation	(13,473,788)
Investment in Real Estate, Net	8,536,998
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Portofino (Val) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Valencia, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	216
Initial Cost to Company, Land	$ 8,640,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	21,487,126
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,637,028
Gross Amount Carried at close of period 12/31/2018, Land	8,640,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,124,154
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,764,154
Accumulated Depreciation	(16,434,227)
Investment in Real Estate, Net	19,329,927
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Portside Towers [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Jersey City, NJ
Real Estate And Accumulated Depreciation Units | ApartmentUnit	527
Initial Cost to Company, Land	$ 22,487,006
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	96,842,913
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	23,175,339
Gross Amount Carried at close of period 12/31/2018, Land	22,487,006
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	120,018,252
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	142,505,258
Accumulated Depreciation	(84,850,599)
Investment in Real Estate, Net	57,654,659
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Potrero 1010 [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Francisco, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	453
Initial Cost to Company, Land	$ 40,830,011
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	179,509,834
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	120,105
Gross Amount Carried at close of period 12/31/2018, Land	40,830,011
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	179,629,939
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	220,459,950
Accumulated Depreciation	(18,869,635)
Investment in Real Estate, Net	201,590,315
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Prado (fka Glendale) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Glendale, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	264
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	67,977,313
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,453,741
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	72,431,054
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	72,431,054
Accumulated Depreciation	(18,216,430)
Investment in Real Estate, Net	54,214,624
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Prime, The [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	273
Initial Cost to Company, Land	$ 34,625,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	77,879,740
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,499,005
Gross Amount Carried at close of period 12/31/2018, Land	34,625,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	79,378,745
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	114,003,745
Accumulated Depreciation	(30,036,655)
Investment in Real Estate, Net	83,967,090
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Prism at Park Avenue South (fka 400 Park Aveue South (EQR)) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	269
Initial Cost to Company, Land	$ 76,292,169
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	171,558,177
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	127,665
Gross Amount Carried at close of period 12/31/2018, Land	76,292,169
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	171,685,842
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	247,978,011
Accumulated Depreciation	(25,554,087)
Investment in Real Estate, Net	222,423,924
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Promenade at Town Center I & II [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Valencia, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	564
Initial Cost to Company, Land	$ 28,200,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	69,795,915
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	9,741,254
Gross Amount Carried at close of period 12/31/2018, Land	28,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	79,537,169
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	107,737,169
Accumulated Depreciation	(41,393,133)
Investment in Real Estate, Net	66,344,036
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Providence [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Bothell, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	200
Initial Cost to Company, Land	$ 3,573,621
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	19,055,505
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,095,294
Gross Amount Carried at close of period 12/31/2018, Land	3,573,621
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	22,150,799
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	25,724,420
Accumulated Depreciation	(11,070,038)
Investment in Real Estate, Net	14,654,382
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Quarry Hills [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Quincy, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	316
Initial Cost to Company, Land	$ 26,900,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	84,411,162
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,829,890
Gross Amount Carried at close of period 12/31/2018, Land	26,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	87,241,052
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	114,141,052
Accumulated Depreciation	(22,257,122)
Investment in Real Estate, Net	91,883,930
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Radius Uptown [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Denver, CO
Real Estate And Accumulated Depreciation Units | ApartmentUnit	372
Initial Cost to Company, Land	$ 13,644,960
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	121,899,032
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	93,774
Gross Amount Carried at close of period 12/31/2018, Land	13,644,960
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	121,992,806
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	135,637,766
Accumulated Depreciation	(3,902,658)
Investment in Real Estate, Net	131,735,108
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Red 160 (fka Redmond Way) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Redmond, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	250
Initial Cost to Company, Land	$ 15,546,376
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	65,320,010
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,306,822
Gross Amount Carried at close of period 12/31/2018, Land	15,546,376
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	66,626,832
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	82,173,208
Accumulated Depreciation	(18,309,824)
Investment in Real Estate, Net	63,863,384
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Redmond Court [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Bellevue, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	206
Initial Cost to Company, Land	$ 10,300,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	33,488,745
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,106,972
Gross Amount Carried at close of period 12/31/2018, Land	10,300,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	34,595,717
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	44,895,717
Accumulated Depreciation	(9,833,862)
Investment in Real Estate, Net	35,061,855
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Regency Palms [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Huntington Beach, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	310
Initial Cost to Company, Land	$ 1,857,400
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	16,713,254
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,506,417
Gross Amount Carried at close of period 12/31/2018, Land	1,857,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	23,219,671
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	25,077,071
Accumulated Depreciation	(18,325,451)
Investment in Real Estate, Net	6,751,620
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Renaissance Villas [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Berkeley, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	34
Initial Cost to Company, Land	$ 2,458,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,542,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	200,843
Gross Amount Carried at close of period 12/31/2018, Land	2,458,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	4,742,843
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	7,200,843
Accumulated Depreciation	(2,002,770)
Investment in Real Estate, Net	5,198,073
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Reserve at Clarendon Centre, The [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	252
Initial Cost to Company, Land	$ 10,500,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	52,812,935
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,759,258
Gross Amount Carried at close of period 12/31/2018, Land	10,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	57,572,193
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	68,072,193
Accumulated Depreciation	(30,673,683)
Investment in Real Estate, Net	37,398,510
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Reserve at Eisenhower, The [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Alexandria, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	226
Initial Cost to Company, Land	$ 6,500,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	34,585,060
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,515,799
Gross Amount Carried at close of period 12/31/2018, Land	6,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	39,100,859
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,600,859
Accumulated Depreciation	(20,712,491)
Investment in Real Estate, Net	24,888,368
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Reserve at Empire Lakes [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Rancho Cucamonga, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	467
Initial Cost to Company, Land	$ 16,345,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	73,080,670
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,320,031
Gross Amount Carried at close of period 12/31/2018, Land	16,345,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	76,400,701
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	92,745,701
Accumulated Depreciation	(36,394,123)
Investment in Real Estate, Net	56,351,578
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Reserve at Mountain View (fka Mountain View) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Mountain View, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	180
Initial Cost to Company, Land	$ 27,000,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	33,029,605
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	7,621,478
Gross Amount Carried at close of period 12/31/2018, Land	27,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	40,651,083
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	67,651,083
Accumulated Depreciation	(10,869,571)
Investment in Real Estate, Net	56,781,512
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Reserve at Potomac Yard [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Alexandria, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	588
Initial Cost to Company, Land	$ 11,918,917
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	68,862,641
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	15,256,457
Gross Amount Carried at close of period 12/31/2018, Land	11,918,917
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	84,119,098
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	96,038,015
Accumulated Depreciation	(42,003,388)
Investment in Real Estate, Net	54,034,627
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Reserve at Town Center I-III (WA) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Mill Creek, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	584
Initial Cost to Company, Land	$ 16,768,705
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	77,511,523
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,623,360
Gross Amount Carried at close of period 12/31/2018, Land	16,768,705
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	83,134,883
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	99,903,588
Accumulated Depreciation	(33,572,969)
Investment in Real Estate, Net	66,330,619
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Residences at Westgate I (fka Westage II) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Pasadena, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	252
Initial Cost to Company, Land	$ 17,859,785
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	109,259,858
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	353,398
Gross Amount Carried at close of period 12/31/2018, Land	17,859,785
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	109,613,256
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	127,473,041
Accumulated Depreciation	(22,357,191)
Investment in Real Estate, Net	105,115,850
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Residences at Westgate II (fka Westgage III) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Pasadena, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	88
Initial Cost to Company, Land	$ 12,118,248
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	40,449,028
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	60,085
Gross Amount Carried at close of period 12/31/2018, Land	12,118,248
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	40,509,113
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	52,627,361
Accumulated Depreciation	(5,850,705)
Investment in Real Estate, Net	46,776,656
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Rianna I & II [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	156
Initial Cost to Company, Land	$ 4,430,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	29,298,096
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,133,335
Gross Amount Carried at close of period 12/31/2018, Land	4,430,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	30,431,431
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	34,861,431
Accumulated Depreciation	(11,522,763)
Investment in Real Estate, Net	23,338,668
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Ridgewood Village I&II [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Diego, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	408
Initial Cost to Company, Land	$ 11,809,500
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	34,004,048
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,830,811
Gross Amount Carried at close of period 12/31/2018, Land	11,809,500
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	39,834,859
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	51,644,359
Accumulated Depreciation	(26,215,341)
Investment in Real Estate, Net	25,429,018
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Riva Terra I (fka Redwood Shores) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Redwood City, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	304
Initial Cost to Company, Land	$ 34,963,355
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	84,587,658
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,579,233
Gross Amount Carried at close of period 12/31/2018, Land	34,963,355
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	89,166,891
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	124,130,246
Accumulated Depreciation	(23,808,487)
Investment in Real Estate, Net	100,321,759
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Riva Terra II (fka Harborside) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Redwood City, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	149
Initial Cost to Company, Land	$ 17,136,645
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	40,536,531
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,273,237
Gross Amount Carried at close of period 12/31/2018, Land	17,136,645
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	42,809,768
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	59,946,413
Accumulated Depreciation	(10,623,659)
Investment in Real Estate, Net	49,322,754
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Riverpark [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Redmond, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	321
Initial Cost to Company, Land	$ 14,355,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	80,894,049
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,905,450
Gross Amount Carried at close of period 12/31/2018, Land	14,355,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	84,799,499
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	99,154,499
Accumulated Depreciation	(24,557,962)
Investment in Real Estate, Net	74,596,537
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Rivington, The [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Hoboken, NJ
Real Estate And Accumulated Depreciation Units | ApartmentUnit	240
Initial Cost to Company, Land	$ 34,340,640
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	112,110,289
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	524,731
Gross Amount Carried at close of period 12/31/2018, Land	34,340,640
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	112,635,020
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	146,975,660
Accumulated Depreciation	(6,937,992)
Investment in Real Estate, Net	140,037,668
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Rosecliff II [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Quincy, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	130
Initial Cost to Company, Land	$ 4,922,840
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	30,202,160
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,342,588
Gross Amount Carried at close of period 12/31/2018, Land	4,922,840
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	31,544,748
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	36,467,588
Accumulated Depreciation	(10,069,250)
Investment in Real Estate, Net	26,398,338
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Sakura Crossing [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	230
Initial Cost to Company, Land	$ 14,641,990
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	42,858,010
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,440,822
Gross Amount Carried at close of period 12/31/2018, Land	14,641,990
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	44,298,832
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	58,940,822
Accumulated Depreciation	(14,646,231)
Investment in Real Estate, Net	44,294,591
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Seventh & James [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	96
Initial Cost to Company, Land	$ 663,800
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,974,803
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,466,962
Gross Amount Carried at close of period 12/31/2018, Land	663,800
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	10,441,765
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	11,105,565
Accumulated Depreciation	(7,764,932)
Investment in Real Estate, Net	3,340,633
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Sheffield Court [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	597
Initial Cost to Company, Land	$ 3,342,381
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	31,337,332
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	15,840,921
Gross Amount Carried at close of period 12/31/2018, Land	3,342,381
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	47,178,253
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	50,520,634
Accumulated Depreciation	(37,713,141)
Investment in Real Estate, Net	12,807,493
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Siena Terrace [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Lake Forest, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	356
Initial Cost to Company, Land	$ 8,900,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	24,083,024
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	7,343,477
Gross Amount Carried at close of period 12/31/2018, Land	8,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	31,426,501
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	40,326,501
Accumulated Depreciation	(21,400,131)
Investment in Real Estate, Net	18,926,370
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Skycrest [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Valencia, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	264
Initial Cost to Company, Land	$ 10,560,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	25,574,457
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,774,667
Gross Amount Carried at close of period 12/31/2018, Land	10,560,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	31,349,124
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	41,909,124
Accumulated Depreciation	(18,371,799)
Investment in Real Estate, Net	23,537,325
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Skyhouse Denver [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Denver, CO
Real Estate And Accumulated Depreciation Units | ApartmentUnit	354
Initial Cost to Company, Land	$ 13,562,331
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	126,360,129
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	98,231
Gross Amount Carried at close of period 12/31/2018, Land	13,562,331
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	126,458,360
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	140,020,691
Accumulated Depreciation	(3,622,426)
Investment in Real Estate, Net	136,398,265
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Skylark [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Union City, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	174
Initial Cost to Company, Land	$ 1,781,600
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	16,731,916
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,618,577
Gross Amount Carried at close of period 12/31/2018, Land	1,781,600
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	22,350,493
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	24,132,093
Accumulated Depreciation	(14,414,952)
Investment in Real Estate, Net	9,717,141
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Skyline Terrace [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Burlingame, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	138
Initial Cost to Company, Land	$ 16,836,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	35,414,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	8,156,471
Gross Amount Carried at close of period 12/31/2018, Land	16,836,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	43,570,471
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	60,406,471
Accumulated Depreciation	(15,013,850)
Investment in Real Estate, Net	45,392,621
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Skyline Towers [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Falls Church, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	939
Initial Cost to Company, Land	$ 78,278,200
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	91,485,591
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	45,016,303
Gross Amount Carried at close of period 12/31/2018, Land	78,278,200
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	136,501,894
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	214,780,094
Accumulated Depreciation	(77,594,870)
Investment in Real Estate, Net	137,185,224
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Skyview [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Rancho Santa Margarita, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	260
Initial Cost to Company, Land	$ 3,380,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	21,952,863
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,500,993
Gross Amount Carried at close of period 12/31/2018, Land	3,380,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,453,856
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	30,833,856
Accumulated Depreciation	(17,769,582)
Investment in Real Estate, Net	13,064,274
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
SoMa II [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Francisco, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 29,406,606
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,741,605
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2018, Land	29,406,606
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	5,741,605
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,148,211
Accumulated Depreciation	0
Investment in Real Estate, Net	35,148,211
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Sonterra at Foothill Ranch [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Foothill Ranch, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	300
Initial Cost to Company, Land	$ 7,503,400
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	24,048,507
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,018,250
Gross Amount Carried at close of period 12/31/2018, Land	7,503,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	30,066,757
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	37,570,157
Accumulated Depreciation	(19,961,454)
Investment in Real Estate, Net	17,608,703
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
South City Station (fka South San Francisco) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Francisco, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	368
Initial Cost to Company, Land	$ 68,900,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	79,476,861
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,611,766
Gross Amount Carried at close of period 12/31/2018, Land	68,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	84,088,627
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	152,988,627
Accumulated Depreciation	(21,524,365)
Investment in Real Estate, Net	131,464,262
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Southwood [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Palo Alto, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	100
Initial Cost to Company, Land	$ 6,936,600
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	14,324,069
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,760,016
Gross Amount Carried at close of period 12/31/2018, Land	6,936,600
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	21,084,085
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	28,020,685
Accumulated Depreciation	(12,852,392)
Investment in Real Estate, Net	15,168,293
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Springbrook Estates [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Riverside, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 18,200,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,145,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2018, Land	18,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	1,145,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	19,345,000
Accumulated Depreciation	0
Investment in Real Estate, Net	19,345,000
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Springline [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	136
Initial Cost to Company, Land	$ 9,163,667
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	47,910,981
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	390,699
Gross Amount Carried at close of period 12/31/2018, Land	9,163,667
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	48,301,680
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	57,465,347
Accumulated Depreciation	(4,533,798)
Investment in Real Estate, Net	52,931,549
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Summerset Village II [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Chatsworth, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 260,646
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2018, Land	260,646
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	260,646
Accumulated Depreciation	0
Investment in Real Estate, Net	260,646
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Summit at Sausalito (fka Sausalito) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Sausalito, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	198
Initial Cost to Company, Land	$ 26,000,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	28,435,024
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	9,140,862
Gross Amount Carried at close of period 12/31/2018, Land	26,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	37,575,886
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	63,575,886
Accumulated Depreciation	(11,439,522)
Investment in Real Estate, Net	52,136,364
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Ten23 (fka 500 West 23rd Street) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	111
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	58,881,873
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	337,851
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	59,219,724
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	59,219,724
Accumulated Depreciation	(14,245,570)
Investment in Real Estate, Net	44,974,154
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Terraces, The [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Francisco, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	117
Initial Cost to Company, Land	$ 14,087,610
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	16,314,151
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,758,321
Gross Amount Carried at close of period 12/31/2018, Land	14,087,610
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,072,472
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	32,160,082
Accumulated Depreciation	(6,415,798)
Investment in Real Estate, Net	25,744,284
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Third Square [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Cambridge, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	471
Initial Cost to Company, Land	$ 26,767,171
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	218,822,728
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	7,870,443
Gross Amount Carried at close of period 12/31/2018, Land	26,767,171
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	226,693,171
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	253,460,342
Accumulated Depreciation	(78,218,773)
Investment in Real Estate, Net	175,241,569
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Three20 [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	134
Initial Cost to Company, Land	$ 7,030,766
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	29,005,762
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	756,472
Gross Amount Carried at close of period 12/31/2018, Land	7,030,766
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	29,762,234
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	36,793,000
Accumulated Depreciation	(6,893,992)
Investment in Real Estate, Net	29,899,008
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Toscana [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Irvine, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	563
Initial Cost to Company, Land	$ 39,410,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	50,806,072
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	20,588,732
Gross Amount Carried at close of period 12/31/2018, Land	39,410,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	71,394,804
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	110,804,804
Accumulated Depreciation	(40,974,164)
Investment in Real Estate, Net	69,830,640
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Town Square at Mark Center I (fka Millbrook I) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Alexandria, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	406
Initial Cost to Company, Land	$ 24,360,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	86,178,714
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	8,490,378
Gross Amount Carried at close of period 12/31/2018, Land	24,360,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	94,669,092
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	119,029,092
Accumulated Depreciation	(44,377,201)
Investment in Real Estate, Net	74,651,891
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Town Square at Mark Center II [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Alexandria, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	272
Initial Cost to Company, Land	$ 15,568,464
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	55,029,607
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,433,417
Gross Amount Carried at close of period 12/31/2018, Land	15,568,464
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	59,463,024
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	75,031,488
Accumulated Depreciation	(21,151,199)
Investment in Real Estate, Net	53,880,289
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Troy Boston [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Boston, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	378
Initial Cost to Company, Land	$ 34,641,051
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	181,602,575
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	101,573
Gross Amount Carried at close of period 12/31/2018, Land	34,641,051
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	181,704,148
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	216,345,199
Accumulated Depreciation	(6,623,226)
Investment in Real Estate, Net	209,721,973
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Urbana (fka Market Street Landing) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	287
Initial Cost to Company, Land	$ 12,542,418
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	75,800,090
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,262,298
Gross Amount Carried at close of period 12/31/2018, Land	12,542,418
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	77,062,388
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	89,604,806
Accumulated Depreciation	(17,836,404)
Investment in Real Estate, Net	71,768,402
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Uwajimaya Village [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	176
Initial Cost to Company, Land	$ 8,800,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	22,188,288
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,039,013
Gross Amount Carried at close of period 12/31/2018, Land	8,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	24,227,301
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	33,027,301
Accumulated Depreciation	(11,748,837)
Investment in Real Estate, Net	21,278,464
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Vantage Pointe [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Diego, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	679
Initial Cost to Company, Land	$ 9,403,960
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	190,596,040
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	10,163,129
Gross Amount Carried at close of period 12/31/2018, Land	9,403,960
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	200,759,169
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	210,163,129
Accumulated Depreciation	(66,454,004)
Investment in Real Estate, Net	143,709,125
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Veloce [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Redmond, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	322
Initial Cost to Company, Land	$ 15,322,724
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	76,176,594
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,429,925
Gross Amount Carried at close of period 12/31/2018, Land	15,322,724
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	77,606,519
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	92,929,243
Accumulated Depreciation	(20,521,554)
Investment in Real Estate, Net	72,407,689
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Verde Condominium Homes (fka Mission Verde, LLC) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Jose, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	108
Initial Cost to Company, Land	$ 5,190,700
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,679,109
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,455,624
Gross Amount Carried at close of period 12/31/2018, Land	5,190,700
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	14,134,733
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	19,325,433
Accumulated Depreciation	(10,358,163)
Investment in Real Estate, Net	8,967,270
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Veridian (fka Silver Spring) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Silver Spring, MD
Real Estate And Accumulated Depreciation Units | ApartmentUnit	457
Initial Cost to Company, Land	$ 18,539,817
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	130,407,365
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,510,354
Gross Amount Carried at close of period 12/31/2018, Land	18,539,817
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	133,917,719
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	152,457,536
Accumulated Depreciation	(43,822,971)
Investment in Real Estate, Net	108,634,565
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Versailles (K-Town) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	225
Initial Cost to Company, Land	$ 10,590,975
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	44,409,025
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,665,109
Gross Amount Carried at close of period 12/31/2018, Land	10,590,975
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	46,074,134
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	56,665,109
Accumulated Depreciation	(17,179,349)
Investment in Real Estate, Net	39,485,760
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Victor on Venice [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	115
Initial Cost to Company, Land	$ 10,350,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	35,433,437
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,003,076
Gross Amount Carried at close of period 12/31/2018, Land	10,350,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	36,436,513
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	46,786,513
Accumulated Depreciation	(15,908,114)
Investment in Real Estate, Net	30,878,399
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Villa Solana [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Laguna Hills, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	272
Initial Cost to Company, Land	$ 1,665,100
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	14,985,678
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	10,741,608
Gross Amount Carried at close of period 12/31/2018, Land	1,665,100
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	25,727,286
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	27,392,386
Accumulated Depreciation	(20,635,508)
Investment in Real Estate, Net	6,756,878
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Village at Del Mar Heights, The (fka Del Mar Heights) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Diego, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	168
Initial Cost to Company, Land	$ 15,100,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	40,859,396
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,925,886
Gross Amount Carried at close of period 12/31/2018, Land	15,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	42,785,282
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	57,885,282
Accumulated Depreciation	(11,360,058)
Investment in Real Estate, Net	46,525,224
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Vintage [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Ontario, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	300
Initial Cost to Company, Land	$ 7,059,230
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	47,677,762
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,539,555
Gross Amount Carried at close of period 12/31/2018, Land	7,059,230
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	49,217,317
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	56,276,547
Accumulated Depreciation	(21,895,611)
Investment in Real Estate, Net	34,380,936
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Virginia Square [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	231
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	85,940,003
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,670,439
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	91,610,442
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	91,610,442
Accumulated Depreciation	(22,371,237)
Investment in Real Estate, Net	69,239,205
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Vista 99 (fka Tasman) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Jose, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	554
Initial Cost to Company, Land	$ 27,709,329
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	176,040,861
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	230,941
Gross Amount Carried at close of period 12/31/2018, Land	27,709,329
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	176,271,802
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	203,981,131
Accumulated Depreciation	(19,667,441)
Investment in Real Estate, Net	184,313,690
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Vista Del Lago [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Mission Viejo, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	608
Initial Cost to Company, Land	$ 4,525,800
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	40,736,293
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	17,318,936
Gross Amount Carried at close of period 12/31/2018, Land	4,525,800
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	58,055,229
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	62,581,029
Accumulated Depreciation	(48,290,527)
Investment in Real Estate, Net	14,290,502
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Vista on Courthouse [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	220
Initial Cost to Company, Land	$ 15,550,260
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	69,449,740
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,389,563
Gross Amount Carried at close of period 12/31/2018, Land	15,550,260
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	71,839,303
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	87,389,563
Accumulated Depreciation	(25,840,645)
Investment in Real Estate, Net	61,548,918
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Walden Park [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Cambridge, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	232
Initial Cost to Company, Land	$ 12,448,888
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	52,044,448
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,411,295
Gross Amount Carried at close of period 12/31/2018, Land	12,448,888
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	56,455,743
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	68,904,631
Accumulated Depreciation	(19,527,545)
Investment in Real Estate, Net	49,377,086
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Water Park Towers [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	362
Initial Cost to Company, Land	$ 34,400,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	108,485,859
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	10,053,790
Gross Amount Carried at close of period 12/31/2018, Land	34,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	118,539,649
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	152,939,649
Accumulated Depreciation	(30,280,723)
Investment in Real Estate, Net	122,658,926
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Watertown Square [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Watertown, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	134
Initial Cost to Company, Land	$ 16,800,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	34,074,056
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,559,270
Gross Amount Carried at close of period 12/31/2018, Land	16,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	35,633,326
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	52,433,326
Accumulated Depreciation	(8,944,170)
Investment in Real Estate, Net	43,489,156
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
West 96th [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	207
Initial Cost to Company, Land	$ 84,800,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	67,055,502
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,705,814
Gross Amount Carried at close of period 12/31/2018, Land	84,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	72,761,316
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	157,561,316
Accumulated Depreciation	(20,616,675)
Investment in Real Estate, Net	136,944,641
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
West End Apartments (fka Emerson Place/ CRP II) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Boston, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	310
Initial Cost to Company, Land	$ 469,546
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	163,123,022
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,668,190
Gross Amount Carried at close of period 12/31/2018, Land	469,546
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	166,791,212
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	167,260,758
Accumulated Depreciation	(61,427,741)
Investment in Real Estate, Net	105,833,017
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
West End Tower (fka Garden Garage) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Boston, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 10,424,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	38,294,331
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2018, Land	10,424,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	38,294,331
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	48,718,331
Accumulated Depreciation	0
Investment in Real Estate, Net	48,718,331
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Westchester at Rockville [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Rockville, MD
Real Estate And Accumulated Depreciation Units | ApartmentUnit	192
Initial Cost to Company, Land	$ 10,600,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	44,135,207
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	884,695
Gross Amount Carried at close of period 12/31/2018, Land	10,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	45,019,902
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	55,619,902
Accumulated Depreciation	(11,209,736)
Investment in Real Estate, Net	44,410,166
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Westmont [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	163
Initial Cost to Company, Land	$ 64,900,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	61,143,259
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,398,852
Gross Amount Carried at close of period 12/31/2018, Land	64,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	65,542,111
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	130,442,111
Accumulated Depreciation	(16,741,081)
Investment in Real Estate, Net	113,701,030
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Westside [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	204
Initial Cost to Company, Land	$ 34,200,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	56,962,630
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,066,088
Gross Amount Carried at close of period 12/31/2018, Land	34,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	60,028,718
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	94,228,718
Accumulated Depreciation	(14,822,757)
Investment in Real Estate, Net	79,405,961
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Westside Barrington (fka Westside Villas III) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	36
Initial Cost to Company, Land	$ 3,060,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,538,871
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,111,261
Gross Amount Carried at close of period 12/31/2018, Land	3,060,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	6,650,132
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	9,710,132
Accumulated Depreciation	(3,887,667)
Investment in Real Estate, Net	5,822,465
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Westside Barry (Westside Villas VI) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	18
Initial Cost to Company, Land	$ 1,530,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,023,523
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	648,119
Gross Amount Carried at close of period 12/31/2018, Land	1,530,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	3,671,642
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	5,201,642
Accumulated Depreciation	(2,196,161)
Investment in Real Estate, Net	3,005,481
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Westside Beloit (fka Westside Villas I) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	21
Initial Cost to Company, Land	$ 1,785,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,233,254
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	736,265
Gross Amount Carried at close of period 12/31/2018, Land	1,785,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	3,969,519
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	5,754,519
Accumulated Depreciation	(2,392,392)
Investment in Real Estate, Net	3,362,127
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Westside Bundy (fka Westside Villas II) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	23
Initial Cost to Company, Land	$ 1,955,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,541,435
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	660,089
Gross Amount Carried at close of period 12/31/2018, Land	1,955,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	4,201,524
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	6,156,524
Accumulated Depreciation	(2,501,347)
Investment in Real Estate, Net	3,655,177
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Westside Butler (fka Westside Villas IV) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	36
Initial Cost to Company, Land	$ 3,060,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,539,390
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,003,468
Gross Amount Carried at close of period 12/31/2018, Land	3,060,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	6,542,858
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	9,602,858
Accumulated Depreciation	(3,890,635)
Investment in Real Estate, Net	5,712,223
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Westside Villas (fka Westside Villas V &VII) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	113
Initial Cost to Company, Land	$ 9,605,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	19,983,385
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,720,073
Gross Amount Carried at close of period 12/31/2018, Land	9,605,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	22,703,458
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	32,308,458
Accumulated Depreciation	(13,177,962)
Investment in Real Estate, Net	19,130,496
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Windridge (CA) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Laguna Niguel, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	344
Initial Cost to Company, Land	$ 2,662,900
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	23,985,497
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	12,358,198
Gross Amount Carried at close of period 12/31/2018, Land	2,662,900
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	36,343,695
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	39,006,595
Accumulated Depreciation	(27,568,039)
Investment in Real Estate, Net	11,438,556
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Wood Creek I [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Pleasant Hill, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	256
Initial Cost to Company, Land	$ 9,729,900
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	23,009,768
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	9,340,814
Gross Amount Carried at close of period 12/31/2018, Land	9,729,900
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	32,350,582
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	42,080,482
Accumulated Depreciation	(23,075,720)
Investment in Real Estate, Net	19,004,762
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Management Business [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Chicago, IL
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	117,010,784
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	117,010,784
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	117,010,784
Accumulated Depreciation	(96,891,265)
Investment in Real Estate, Net	20,119,519
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Operating Partnership [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Chicago, IL
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,278,996
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	10,278,996
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	10,278,996
Accumulated Depreciation	0
Investment in Real Estate, Net	10,278,996
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Other [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	N/A
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	74,341
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	74,341
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	74,341
Accumulated Depreciation	(29,979)
Investment in Real Estate, Net	44,362
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Wholly Owned Unencumbered [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Units | ApartmentUnit	62,862
Initial Cost to Company, Land	$ 4,900,861,387
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	15,320,429,009
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,387,840,336
Gross Amount Carried at close of period 12/31/2018, Land	4,900,861,387
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	16,708,269,345
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	21,609,130,732
Accumulated Depreciation	(5,400,484,879)
Investment in Real Estate, Net	16,208,645,853
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
1401 Joyce on Pentagon Row [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	326
Initial Cost to Company, Land	$ 9,780,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	89,668,165
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,209,262
Gross Amount Carried at close of period 12/31/2018, Land	9,780,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	94,877,427
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	104,657,427
Accumulated Depreciation	(34,814,020)
Investment in Real Estate, Net	69,843,407
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 57,384,106
2501 Porter [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Washington, D.C.
Real Estate And Accumulated Depreciation Units | ApartmentUnit	202
Initial Cost to Company, Land	$ 13,000,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	75,271,179
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,617,637
Gross Amount Carried at close of period 12/31/2018, Land	13,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	81,888,816
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	94,888,816
Accumulated Depreciation	(20,177,043)
Investment in Real Estate, Net	$ 74,711,773
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
300 East 39th (fka East 39th) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	254
Initial Cost to Company, Land	$ 48,900,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	96,174,639
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,927,499
Gross Amount Carried at close of period 12/31/2018, Land	48,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	101,102,138
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	150,002,138
Accumulated Depreciation	(25,417,391)
Investment in Real Estate, Net	124,584,747
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 61,139,469
303 East 83rd (fka Camargue) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	261
Initial Cost to Company, Land	$ 79,400,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	79,122,624
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,389,689
Gross Amount Carried at close of period 12/31/2018, Land	79,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	85,512,313
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	164,912,313
Accumulated Depreciation	(22,235,813)
Investment in Real Estate, Net	$ 142,676,500
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
425 Broadway [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Santa Monica, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	101
Initial Cost to Company, Land	$ 12,600,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	34,394,772
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,606,786
Gross Amount Carried at close of period 12/31/2018, Land	12,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	38,001,558
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	50,601,558
Accumulated Depreciation	(9,639,353)
Investment in Real Estate, Net	$ 40,962,205
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
55 West Fifth I & II (fka Townhouse Plaza and Gardens) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Mateo, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	241
Initial Cost to Company, Land	$ 21,041,710
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	71,931,323
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	13,082,237
Gross Amount Carried at close of period 12/31/2018, Land	21,041,710
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	85,013,560
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	106,055,270
Accumulated Depreciation	(25,342,170)
Investment in Real Estate, Net	80,713,100
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 25,456,082
800 Sixth Ave (fka Chelsea) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	266
Initial Cost to Company, Land	$ 59,900,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	155,861,605
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,551,093
Gross Amount Carried at close of period 12/31/2018, Land	59,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	158,412,698
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	218,312,698
Accumulated Depreciation	(38,237,590)
Investment in Real Estate, Net	180,075,108
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 78,599,339
929 Mass (fka 929 House) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Cambridge, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	127
Initial Cost to Company, Land	$ 3,252,993
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	21,745,595
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	7,292,188
Gross Amount Carried at close of period 12/31/2018, Land	3,252,993
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	29,037,783
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	32,290,776
Accumulated Depreciation	(18,665,226)
Investment in Real Estate, Net	13,625,550
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 119,684
Academy Village [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	North Hollywood, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	248
Initial Cost to Company, Land	$ 25,000,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	23,593,194
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	8,913,532
Gross Amount Carried at close of period 12/31/2018, Land	25,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	32,506,726
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	57,506,726
Accumulated Depreciation	(19,215,717)
Investment in Real Estate, Net	38,291,009
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 19,985,389
Alcyone [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	162
Initial Cost to Company, Land	$ 11,379,497
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	49,360,503
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,103,680
Gross Amount Carried at close of period 12/31/2018, Land	11,379,497
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	50,464,183
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	61,843,680
Accumulated Depreciation	(9,767,220)
Investment in Real Estate, Net	52,076,460
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 27,756,919
Artisan Square [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Northridge, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	140
Initial Cost to Company, Land	$ 7,000,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	20,537,359
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,670,956
Gross Amount Carried at close of period 12/31/2018, Land	7,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	22,208,315
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	29,208,315
Accumulated Depreciation	(12,312,121)
Investment in Real Estate, Net	16,896,194
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 22,766,586
Avenir Apartments [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Boston, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	241
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	114,321,619
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,484,463
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	117,806,082
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	117,806,082
Accumulated Depreciation	(28,125,723)
Investment in Real Estate, Net	89,680,359
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 87,221,511
Bella Vista I, II, III Combined [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Woodland Hills, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	579
Initial Cost to Company, Land	$ 31,682,754
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	121,095,786
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	8,186,190
Gross Amount Carried at close of period 12/31/2018, Land	31,682,754
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	129,281,976
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	160,964,730
Accumulated Depreciation	(58,472,749)
Investment in Real Estate, Net	102,491,981
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 57,966,537
Berkeleyan [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Berkeley, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	56
Initial Cost to Company, Land	$ 4,377,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	16,022,110
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	673,901
Gross Amount Carried at close of period 12/31/2018, Land	4,377,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	16,696,011
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	21,073,011
Accumulated Depreciation	(7,235,667)
Investment in Real Estate, Net	13,837,344
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 8,100,556
Calvert Woodley [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Washington, D.C.
Real Estate And Accumulated Depreciation Units | ApartmentUnit	136
Initial Cost to Company, Land	$ 12,600,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	43,527,379
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,208,011
Gross Amount Carried at close of period 12/31/2018, Land	12,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	45,735,390
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	58,335,390
Accumulated Depreciation	(11,663,122)
Investment in Real Estate, Net	$ 46,672,268
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
Chelsea Square [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Redmond, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	113
Initial Cost to Company, Land	$ 3,397,100
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,289,074
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,730,568
Gross Amount Carried at close of period 12/31/2018, Land	3,397,100
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	12,019,642
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	15,416,742
Accumulated Depreciation	(8,256,357)
Investment in Real Estate, Net	7,160,385
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 9,234,049
Citrus Suites [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Santa Monica, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	70
Initial Cost to Company, Land	$ 9,000,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	16,950,326
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,094,969
Gross Amount Carried at close of period 12/31/2018, Land	9,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	19,045,295
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	28,045,295
Accumulated Depreciation	(4,826,188)
Investment in Real Estate, Net	$ 23,219,107
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
Cleveland House [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Washington, D.C.
Real Estate And Accumulated Depreciation Units | ApartmentUnit	214
Initial Cost to Company, Land	$ 18,300,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	66,392,414
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,858,254
Gross Amount Carried at close of period 12/31/2018, Land	18,300,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	71,250,668
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	89,550,668
Accumulated Depreciation	(17,799,363)
Investment in Real Estate, Net	$ 71,751,305
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
Columbia Crossing [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	247
Initial Cost to Company, Land	$ 23,500,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	53,045,073
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,877,507
Gross Amount Carried at close of period 12/31/2018, Land	23,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	55,922,580
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	79,422,580
Accumulated Depreciation	(14,794,273)
Investment in Real Estate, Net	$ 64,628,307
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
Estancia at Santa Clara (fka Santa Clara) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Santa Clara, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	450
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	123,759,804
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,657,294
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	125,417,098
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	125,417,098
Accumulated Depreciation	(32,083,921)
Investment in Real Estate, Net	$ 93,333,177
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
Fairchase [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Fairfax, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	392
Initial Cost to Company, Land	$ 23,500,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	87,722,321
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,210,925
Gross Amount Carried at close of period 12/31/2018, Land	23,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	88,933,246
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	112,433,246
Accumulated Depreciation	(21,595,734)
Investment in Real Estate, Net	$ 90,837,512
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
Fairfield [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Stamford, CT
Real Estate And Accumulated Depreciation Units | ApartmentUnit	263
Initial Cost to Company, Land	$ 6,510,200
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	39,690,120
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	8,602,359
Gross Amount Carried at close of period 12/31/2018, Land	6,510,200
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	48,292,479
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	54,802,679
Accumulated Depreciation	(34,338,783)
Investment in Real Estate, Net	20,463,896
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 31,348,151
Fine Arts Building [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Berkeley, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	100
Initial Cost to Company, Land	$ 7,817,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	26,462,772
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	880,966
Gross Amount Carried at close of period 12/31/2018, Land	7,817,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,343,738
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,160,738
Accumulated Depreciation	(11,703,908)
Investment in Real Estate, Net	23,456,830
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 15,772,690
Flats at DuPont Circle [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Washington, D.C.
Real Estate And Accumulated Depreciation Units | ApartmentUnit	306
Initial Cost to Company, Land	$ 35,200,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	108,768,198
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,179,209
Gross Amount Carried at close of period 12/31/2018, Land	35,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	111,947,407
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	147,147,407
Accumulated Depreciation	(25,978,612)
Investment in Real Estate, Net	$ 121,168,795
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
Gaia Building [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Berkeley, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	91
Initial Cost to Company, Land	$ 7,113,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	25,623,826
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	400,152
Gross Amount Carried at close of period 12/31/2018, Land	7,113,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,023,978
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	33,136,978
Accumulated Depreciation	(11,264,581)
Investment in Real Estate, Net	21,872,397
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 14,310,309
Gaithersburg Station [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Gaithersburg, MD
Real Estate And Accumulated Depreciation Units | ApartmentUnit	389
Initial Cost to Company, Land	$ 17,500,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	74,678,917
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,136,625
Gross Amount Carried at close of period 12/31/2018, Land	17,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	75,815,542
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	93,315,542
Accumulated Depreciation	(17,882,838)
Investment in Real Estate, Net	75,432,704
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 94,150,066
Glo [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	201
Initial Cost to Company, Land	$ 16,047,022
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	48,650,963
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,425,049
Gross Amount Carried at close of period 12/31/2018, Land	16,047,022
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	52,076,012
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	68,123,034
Accumulated Depreciation	(15,990,887)
Investment in Real Estate, Net	52,132,147
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 32,199,417
Hathaway [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Long Beach, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	385
Initial Cost to Company, Land	$ 2,512,500
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	22,611,912
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	10,753,054
Gross Amount Carried at close of period 12/31/2018, Land	2,512,500
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	33,364,966
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,877,466
Accumulated Depreciation	(25,621,271)
Investment in Real Estate, Net	10,256,195
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 46,495,108
Kelvin Court (fka Alta Pacific) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Irvine, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	132
Initial Cost to Company, Land	$ 10,752,145
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	34,628,115
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	656,460
Gross Amount Carried at close of period 12/31/2018, Land	10,752,145
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	35,284,575
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	46,036,720
Accumulated Depreciation	(13,177,993)
Investment in Real Estate, Net	32,858,727
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 26,234,062
La Terrazza at Colma Station [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Colma, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	155
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	41,251,044
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,304,807
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	43,555,851
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	43,555,851
Accumulated Depreciation	(18,264,493)
Investment in Real Estate, Net	25,291,358
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 24,997,955
Liberty Park [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Braintree, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	202
Initial Cost to Company, Land	$ 5,977,504
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	26,749,111
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,765,782
Gross Amount Carried at close of period 12/31/2018, Land	5,977,504
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	33,514,893
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	39,492,397
Accumulated Depreciation	(18,532,044)
Investment in Real Estate, Net	20,960,353
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 24,966,238
Mill Creek [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Milpitas, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	516
Initial Cost to Company, Land	$ 12,858,693
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	57,168,503
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	14,775,239
Gross Amount Carried at close of period 12/31/2018, Land	12,858,693
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	71,943,742
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	84,802,435
Accumulated Depreciation	(36,507,386)
Investment in Real Estate, Net	48,295,049
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 69,282,256
Moda [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	251
Initial Cost to Company, Land	$ 12,649,228
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	36,842,012
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,379,251
Gross Amount Carried at close of period 12/31/2018, Land	12,649,228
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	38,221,263
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	50,870,491
Accumulated Depreciation	(13,657,076)
Investment in Real Estate, Net	$ 37,213,415
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
Olympus Towers [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	328
Initial Cost to Company, Land	$ 14,752,034
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	73,335,425
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	9,447,968
Gross Amount Carried at close of period 12/31/2018, Land	14,752,034
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	82,783,393
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	97,535,427
Accumulated Depreciation	(43,130,107)
Investment in Real Estate, Net	54,405,320
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 49,823,673
Park Place at San Mateo (fka San Mateo) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Mateo, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	575
Initial Cost to Company, Land	$ 71,900,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	211,907,141
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	13,040,037
Gross Amount Carried at close of period 12/31/2018, Land	71,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	224,947,178
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	296,847,178
Accumulated Depreciation	(56,244,011)
Investment in Real Estate, Net	$ 240,603,167
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
Reserve at Fairfax Corner [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Fairfax, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	652
Initial Cost to Company, Land	$ 15,804,057
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	63,129,051
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	11,739,962
Gross Amount Carried at close of period 12/31/2018, Land	15,804,057
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	74,869,013
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	90,673,070
Accumulated Depreciation	(41,689,916)
Investment in Real Estate, Net	48,983,154
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 84,717,832
SoMa Square Apartments (fka South Market) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Francisco, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	410
Initial Cost to Company, Land	$ 79,900,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	177,316,977
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	12,766,992
Gross Amount Carried at close of period 12/31/2018, Land	79,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	190,083,969
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	269,983,969
Accumulated Depreciation	(45,375,257)
Investment in Real Estate, Net	$ 224,608,712
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
Square One [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	112
Initial Cost to Company, Land	$ 7,222,544
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	26,277,456
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	74,562
Gross Amount Carried at close of period 12/31/2018, Land	7,222,544
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,352,018
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	33,574,562
Accumulated Depreciation	(5,408,769)
Investment in Real Estate, Net	$ 28,165,793
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
Summerset Village [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Chatsworth, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	280
Initial Cost to Company, Land	$ 2,629,804
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	23,670,889
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	8,181,014
Gross Amount Carried at close of period 12/31/2018, Land	2,629,804
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	31,851,903
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	34,481,707
Accumulated Depreciation	(23,765,883)
Investment in Real Estate, Net	10,715,824
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 38,020,343
Teresina [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Chula Vista, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	440
Initial Cost to Company, Land	$ 28,600,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	61,916,670
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,795,448
Gross Amount Carried at close of period 12/31/2018, Land	28,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	68,712,118
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	97,312,118
Accumulated Depreciation	(31,806,076)
Investment in Real Estate, Net	65,506,042
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 37,940,000
Touriel Building [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Berkeley, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	35
Initial Cost to Company, Land	$ 2,736,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,810,027
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	199,965
Gross Amount Carried at close of period 12/31/2018, Land	2,736,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	8,009,992
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	10,745,992
Accumulated Depreciation	(3,570,951)
Investment in Real Estate, Net	7,175,041
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 4,874,236
Vantage Hollywood [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	298
Initial Cost to Company, Land	$ 42,580,326
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	56,014,674
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,203,271
Gross Amount Carried at close of period 12/31/2018, Land	42,580,326
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	57,217,945
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	99,798,271
Accumulated Depreciation	(10,415,693)
Investment in Real Estate, Net	89,382,578
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 40,501,067
Versailles [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Woodland Hills, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	253
Initial Cost to Company, Land	$ 12,650,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	33,656,292
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	7,510,844
Gross Amount Carried at close of period 12/31/2018, Land	12,650,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	41,167,136
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	53,817,136
Accumulated Depreciation	(22,859,119)
Investment in Real Estate, Net	30,958,017
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 30,357,682
Vintage at 425 Broadway (fka Promenade) [Memebr]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Santa Monica, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	60
Initial Cost to Company, Land	$ 9,000,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	13,961,523
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,763,696
Gross Amount Carried at close of period 12/31/2018, Land	9,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	15,725,219
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	24,725,219
Accumulated Depreciation	(4,182,605)
Investment in Real Estate, Net	$ 20,542,614
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
West 54th [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	222
Initial Cost to Company, Land	$ 60,900,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	48,193,837
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,801,228
Gross Amount Carried at close of period 12/31/2018, Land	60,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	51,995,065
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	112,895,065
Accumulated Depreciation	(14,869,327)
Investment in Real Estate, Net	98,025,738
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 48,175,896
Westgate (fka Westgate I) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Pasadena, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	480
Initial Cost to Company, Land	$ 22,898,848
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	133,467,158
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,575,071
Gross Amount Carried at close of period 12/31/2018, Land	22,898,848
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	136,042,229
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	158,941,077
Accumulated Depreciation	(37,281,584)
Investment in Real Estate, Net	121,659,493
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 96,386,296
Woodleaf [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Campbell, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	178
Initial Cost to Company, Land	$ 8,550,600
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	16,988,183
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,181,298
Gross Amount Carried at close of period 12/31/2018, Land	8,550,600
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	22,169,481
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	30,720,081
Accumulated Depreciation	(15,240,849)
Investment in Real Estate, Net	15,479,232
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 17,835,169
Portfolio/Entity Encumbrances [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	0
Accumulated Depreciation	0
Investment in Real Estate, Net	0
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 797,768,476
Investment in Real Estate - Wholly Owned Encumbered [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Units | ApartmentUnit	12,140
Initial Cost to Company, Land	$ 932,672,559
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,860,557,660
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	229,886,950
Gross Amount Carried at close of period 12/31/2018, Land	932,672,559
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	3,090,444,610
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	4,023,117,169
Accumulated Depreciation	(1,039,436,780)
Investment in Real Estate, Net	2,983,680,389
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 2,081,887,149
2300 Elliott [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	92
Initial Cost to Company, Land	$ 796,800
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,173,725
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,928,668
Gross Amount Carried at close of period 12/31/2018, Land	796,800
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	14,102,393
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	14,899,193
Accumulated Depreciation	(11,358,634)
Investment in Real Estate, Net	3,540,559
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Canyon Ridge [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Diego, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	162
Initial Cost to Company, Land	$ 4,869,448
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,955,064
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,016,206
Gross Amount Carried at close of period 12/31/2018, Land	4,869,448
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	15,971,270
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	20,840,718
Accumulated Depreciation	(11,185,103)
Investment in Real Estate, Net	9,655,615
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Country Oaks [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Agoura Hills, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	256
Initial Cost to Company, Land	$ 6,105,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	29,561,865
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,941,477
Gross Amount Carried at close of period 12/31/2018, Land	6,105,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	36,503,342
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	42,608,342
Accumulated Depreciation	(21,079,355)
Investment in Real Estate, Net	21,528,987
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Harrison Square (fka Elliot Bay) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	166
Initial Cost to Company, Land	$ 7,600,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	35,844,345
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,487,099
Gross Amount Carried at close of period 12/31/2018, Land	7,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	41,331,444
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	48,931,444
Accumulated Depreciation	(11,150,395)
Investment in Real Estate, Net	37,781,049
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Radius Koreatown [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	301
Initial Cost to Company, Land	$ 32,494,154
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	84,645,202
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	224,059
Gross Amount Carried at close of period 12/31/2018, Land	32,494,154
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	84,869,261
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	117,363,415
Accumulated Depreciation	(8,194,532)
Investment in Real Estate, Net	109,168,883
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Rosecliff [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Quincy, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	156
Initial Cost to Company, Land	$ 5,460,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	15,721,570
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,822,519
Gross Amount Carried at close of period 12/31/2018, Land	5,460,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	19,544,089
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	25,004,089
Accumulated Depreciation	(13,068,617)
Investment in Real Estate, Net	11,935,472
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Strayhorse at Arrowhead Ranch [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Glendale, AZ
Real Estate And Accumulated Depreciation Units | ApartmentUnit	136
Initial Cost to Company, Land	$ 4,400,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	12,968,002
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	966,107
Gross Amount Carried at close of period 12/31/2018, Land	4,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	13,934,109
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	18,334,109
Accumulated Depreciation	(6,624,197)
Investment in Real Estate, Net	11,709,912
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Venn at Main [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Bellevue, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	350
Initial Cost to Company, Land	$ 26,626,498
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	151,652,048
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	160,761
Gross Amount Carried at close of period 12/31/2018, Land	26,626,498
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	151,812,809
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	178,439,307
Accumulated Depreciation	(10,307,620)
Investment in Real Estate, Net	168,131,687
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Wood Creek II (fka Willow Brook (CA)) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Pleasant Hill, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	228
Initial Cost to Company, Land	$ 5,055,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	38,388,672
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,854,946
Gross Amount Carried at close of period 12/31/2018, Land	5,055,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	45,243,618
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	50,298,618
Accumulated Depreciation	(23,768,126)
Investment in Real Estate, Net	26,530,492
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Partially Owned Unencumbered [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Units | ApartmentUnit	1,847
Initial Cost to Company, Land	$ 93,406,900
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	387,910,493
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	35,401,842
Gross Amount Carried at close of period 12/31/2018, Land	93,406,900
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	423,312,335
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	516,719,235
Accumulated Depreciation	(116,736,579)
Investment in Real Estate, Net	399,982,656
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Bellevue Meadows [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Bellevue, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	180
Initial Cost to Company, Land	$ 4,507,100
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	12,574,814
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,634,209
Gross Amount Carried at close of period 12/31/2018, Land	4,507,100
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,209,023
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	22,716,123
Accumulated Depreciation	(13,322,710)
Investment in Real Estate, Net	9,393,413
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 16,515,951
Canyon Creek (CA) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	San Ramon, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	268
Initial Cost to Company, Land	$ 5,425,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,812,121
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	7,726,619
Gross Amount Carried at close of period 12/31/2018, Land	5,425,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,538,740
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	31,963,740
Accumulated Depreciation	(17,263,363)
Investment in Real Estate, Net	14,700,377
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 28,150,731
Lantern Cove [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Foster City, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	232
Initial Cost to Company, Land	$ 6,945,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	23,064,976
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,896,605
Gross Amount Carried at close of period 12/31/2018, Land	6,945,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	29,961,581
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	36,906,581
Accumulated Depreciation	(18,556,525)
Investment in Real Estate, Net	18,350,056
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 36,425,025
Schooner Bay I [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Foster City, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	168
Initial Cost to Company, Land	$ 5,345,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	20,390,618
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,636,468
Gross Amount Carried at close of period 12/31/2018, Land	5,345,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,027,086
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	31,372,086
Accumulated Depreciation	(16,017,984)
Investment in Real Estate, Net	15,354,102
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 28,839,869
Schooner Bay II [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Foster City, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	144
Initial Cost to Company, Land	$ 4,550,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,064,764
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,074,751
Gross Amount Carried at close of period 12/31/2018, Land	4,550,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	23,139,515
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	27,689,515
Accumulated Depreciation	(14,268,541)
Investment in Real Estate, Net	13,420,974
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 26,144,881
Surrey Downs [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Bellevue, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	122
Initial Cost to Company, Land	$ 3,057,100
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,848,618
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,347,614
Gross Amount Carried at close of period 12/31/2018, Land	3,057,100
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	11,196,232
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	14,253,332
Accumulated Depreciation	(7,873,885)
Investment in Real Estate, Net	6,379,447
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 9,819,750
Virgil Square [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Los Angeles, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	142
Initial Cost to Company, Land	$ 5,500,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	15,216,613
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,070,140
Gross Amount Carried at close of period 12/31/2018, Land	5,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,286,753
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	23,786,753
Accumulated Depreciation	(9,309,905)
Investment in Real Estate, Net	14,476,848
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 9,885,805
Wisconsin Place [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Chevy Chase, MD
Real Estate And Accumulated Depreciation Units | ApartmentUnit	432
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	172,089,355
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,277,053
Gross Amount Carried at close of period 12/31/2018, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	173,366,408
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	173,366,408
Accumulated Depreciation	(43,009,588)
Investment in Real Estate, Net	130,356,820
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 147,801,323
Partially Owned Encumbered [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Units | ApartmentUnit	1,688
Initial Cost to Company, Land	$ 35,329,200
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	288,061,879
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	38,663,459
Gross Amount Carried at close of period 12/31/2018, Land	35,329,200
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	326,725,338
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	362,054,538
Accumulated Depreciation	(139,622,501)
Investment in Real Estate, Net	222,432,037
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 303,583,335
Total Consolidated Investment in Real Estate [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Units | ApartmentUnit	78,537
Initial Cost to Company, Land	$ 5,962,270,046
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,856,959,041
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,691,792,587
Gross Amount Carried at close of period 12/31/2018, Land	5,962,270,046
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	20,548,751,628
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	26,511,021,674
Accumulated Depreciation	(6,696,280,739)
Investment in Real Estate, Net	19,814,740,935
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 2,385,470,484

Schedule III - Real Estate an_7

Schedule III - Real Estate and Accumulated Depreciation (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2018USD ($)PropertyApartmentUnit	Dec. 31, 2017USD ($)
Real Estate And Accumulated Depreciation [Line Items]
Furniture, fixtures and equipment	$ 1,722,231,000	$ 1,548,961,000
Land and depreciable property net	$ 14,000,000,000	$ 14,800,000,000
Real Estate And Accumulated Depreciation Abstract
Total properties | Property	307
Apartment units | ApartmentUnit	79,482
Partially Owned Properties – Unconsolidated
Real Estate And Accumulated Depreciation Abstract
Total properties | Property	2
Apartment units | ApartmentUnit	945
Depreciable Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Furniture, fixtures and equipment	$ 1,722,231,029
Building [Member]
Real Estate And Accumulated Depreciation Abstract
Property, Plant and Equipment, Estimated Useful Lives	30 years
Renovations and Improvements Minimum [Member]
Real Estate And Accumulated Depreciation Abstract
Property, Plant and Equipment, Estimated Useful Lives	5 years
Renovations and Improvements Maximum [Member]
Real Estate And Accumulated Depreciation Abstract
Property, Plant and Equipment, Estimated Useful Lives	15 years
Replacements Minimum [Member]
Real Estate And Accumulated Depreciation Abstract
Property, Plant and Equipment, Estimated Useful Lives	5 years
Replacements Maximum [Member]
Real Estate And Accumulated Depreciation Abstract
Property, Plant and Equipment, Estimated Useful Lives	10 years
Management Business Renovations and Improvements Minimum [Member]
Real Estate And Accumulated Depreciation Abstract
Property, Plant and Equipment, Estimated Useful Lives	3 years
Management Business Renovations and Improvements Maximum [Member]
Real Estate And Accumulated Depreciation Abstract
Property, Plant and Equipment, Estimated Useful Lives	7 years