Erp Operating LTD Partnership 10-K 20 Feb 20 2019 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2019	Feb. 14, 2020	Jun. 30, 2019
Document Information [Line Items]
Entity Registrant Name	EQUITY RESIDENTIAL
Entity Central Index Key	0000906107
Document Type	10-K
Document Period End Date	Dec. 31, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
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			$ 27.9
Entity Common Stock, Shares Outstanding		371,978,449
Entity File Number	1-12252
Entity Tax Identification Number	13-3675988
Entity Address, Address Line One	Two North Riverside Plaza
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60606
City Area Code	312
Local Phone Number	474-1300
Entity Incorporation, State or Country Code	MD
Title of 12(b) Security	Common Shares of Beneficial Interest,$0.01 Par Value (Equity Residential)
Security Exchange Name	NYSE
Document Annual Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Documents Incorporated by Reference	Part III incorporates by reference certain information that will be contained in Equity Residential’s Proxy Statement relating to its 2020 Annual Meeting of Shareholders, which Equity Residential intends to file no later than 120 days after the end of its fiscal year ended December 31, 2019, and thus these items have been omitted in accordance with General Instruction G(3) to Form 10-K.  Equity Residential is the general partner and 96.4% owner of ERP Operating Limited Partnership.
ERPOP [Member]
Document Information [Line Items]
Entity Registrant Name	ERP OPERATING LIMITED PARTNERSHIP
Entity Central Index Key	0000931182
Document Type	10-K
Document Period End Date	Dec. 31, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
No Trading Symbol Flag	true
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
Entity File Number	0-24920
Entity Tax Identification Number	36-3894853
Entity Address, Address Line One	Two North Riverside Plaza
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60606
City Area Code	312
Local Phone Number	474-1300
Entity Incorporation, State or Country Code	IL
Title of 12(b) Security	7.57% Notes due August 15, 2026(ERP Operating Limited Partnership)
Security Exchange Name	NYSE
Document Annual Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Land	$ 5,936,188	$ 5,875,803
Depreciable property	21,319,101	20,435,901
Projects under development	181,630	109,409
Land held for development	96,688	89,909
Investment in real estate	27,533,607	26,511,022
Accumulated depreciation	(7,276,786)	(6,696,281)
Investment in real estate, net	20,256,821	19,814,741
Investments in unconsolidated entities	52,238	58,349
Cash and cash equivalents	45,753	47,442
Restricted deposits	71,246	68,871
Right-of-use assets	512,774
Other assets	233,937	404,806
Total assets	21,172,769	20,394,209
Liabilities:
Mortgage notes payable, net	1,941,610	2,385,470
Notes, net	6,077,513	5,933,286
Line of credit and commercial paper	1,017,833	499,183
Accounts payable and accrued expenses	94,350	102,471
Accrued interest payable	66,852	62,622
Lease liabilities	331,334
Other liabilities	346,963	358,563
Security deposits	70,062	67,258
Distributions payable	218,326	206,601
Total liabilities	10,164,843	9,615,454
Commitments and contingencies
Redeemable Noncontrolling Interests – Operating Partnership	463,400	379,106
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, 2019 and December 31, 2018	37,280	37,280
Common Shares of beneficial interest, $0.01 par value; 1,000,000,000 shares authorized; 371,670,884 shares issued and outstanding as of December 31, 2019 and 369,405,161 shares issued and outstanding as of December 31, 2018	3,717	3,694
Paid in capital	8,965,577	8,935,453
Retained earnings	1,386,495	1,261,763
Accumulated other comprehensive income (loss)	(77,563)	(64,986)
Total shareholders’ equity	10,315,506	10,173,204
Noncontrolling Interests:
Operating Partnership	227,837	228,738
Partially Owned Properties	1,183	(2,293)
Total Noncontrolling Interests	229,020	226,445
Total equity	10,544,526	10,399,649
Total liabilities and equity/capital	$ 21,172,769	$ 20,394,209

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
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	371,670,884	369,405,161
Common Stock, Shares, Outstanding	371,670,884	369,405,161

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
REVENUES
Rental income	$ 2,700,691	$ 2,577,681	$ 2,470,689
Fee and asset management	$ 384	$ 753	$ 717
Type of Revenue [Extensible List]	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember
Total revenues	$ 2,701,075	$ 2,578,434	$ 2,471,406
EXPENSES
Property and maintenance	446,845	429,335	405,281
Real estate taxes and insurance	366,139	357,814	335,495
Property management	95,344	92,485	85,493
General and administrative	52,757	53,813	52,224
Depreciation	831,083	785,725	743,749
Total expenses	1,792,168	1,719,172	1,622,242
Net gain (loss) on sales of real estate properties	447,637	256,810	157,057
Impairment		(702)	(1,693)
Operating income	1,356,544	1,115,370	1,004,528
Interest and other income	2,817	15,317	6,136
Other expenses	(18,177)	(17,267)	(5,186)
Interest:
Expense incurred, net	(390,076)	(413,360)	(383,890)
Amortization of deferred financing costs	(11,670)	(11,310)	(8,526)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	939,438	688,750	613,062
Income and other tax (expense) benefit	2,281	(878)	(478)
Income (loss) from investments in unconsolidated entities	65,945	(3,667)	(3,370)
Net gain (loss) on sales of land parcels	2,044	987	19,167
Net income	1,009,708	685,192	628,381
Net (income) loss attributable to Noncontrolling Interests:
Operating Partnership	(36,034)	(24,939)	(22,604)
Partially Owned Properties	(3,297)	(2,718)	(2,323)
Net income attributable to controlling interests	970,377	657,535	603,454
Preferred distributions	(3,090)	(3,090)	(3,091)
Net income available to Common Shares	$ 967,287	$ 654,445	$ 600,363
Earnings per share – basic:
Net income available to Common Shares	$ 2.61	$ 1.78	$ 1.64
Weighted average Common Shares outstanding	370,461	368,052	366,968
Earnings per share – diluted:
Net income available to Common Shares	$ 2.60	$ 1.77	$ 1.63
Weighted average Common Shares outstanding	386,333	383,695	382,678

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Comprehensive income:
Net income	$ 1,009,708	$ 685,192	$ 628,381
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the year	(33,765)	5,174	6,439
Losses reclassified into earnings from other comprehensive income	21,188	18,452	18,858
Other comprehensive income (loss)	(12,577)	23,626	25,297
Comprehensive income	997,131	708,818	653,678
Comprehensive (income) attributable to Noncontrolling Interests	(38,872)	(28,526)	(25,845)
Comprehensive income attributable to controlling interests	$ 958,259	$ 680,292	$ 627,833

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 1,009,708	$ 685,192	$ 628,381
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	831,083	785,725	743,749
Amortization of deferred financing costs	11,670	11,310	8,526
Amortization of above/below market lease intangibles	(71)	4,392	3,828
Amortization of discounts and premiums on debt	11,780	22,781	3,536
Amortization of deferred settlements on derivative instruments	21,176	18,440	18,847
Amortization of right-of-use assets	11,764
Impairment		702	1,693
Write-off of pursuit costs	5,529	4,450	3,106
(Income) loss from investments in unconsolidated entities	(65,945)	3,667	3,370
Distributions from unconsolidated entities – return on capital	2,621	2,492	2,632
Net (gain) loss on sales of real estate properties	(447,637)	(256,810)	(157,057)
Net (gain) loss on sales of land parcels	(2,044)	(987)	(19,167)
Net (gain) loss on debt extinguishment	13,647	22,110	12,258
Realized/unrealized (gain) loss on derivative instruments		50
Compensation paid with Company Common Shares	24,449	27,132	24,997
Other operating activities, net	(287)
Changes in assets and liabilities:
(Increase) decrease in other assets	6,278	4,097	(449)
Increase (decrease) in accounts payable and accrued expenses	5,116	(1,862)	11,532
Increase (decrease) in accrued interest payable	4,230	4,587	(2,911)
Increase (decrease) in lease liabilities	(2,269)
Increase (decrease) in other liabilities	13,382	16,578	(23,468)
Increase (decrease) in security deposits	2,804	2,249	2,385
Net cash provided by operating activities	1,456,984	1,356,295	1,265,788
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(1,518,878)	(708,092)	(466,394)
Investment in real estate – development/other	(195,692)	(154,431)	(276,382)
Capital expenditures to real estate	(178,423)	(188,501)	(202,607)
Non-real estate capital additions	(4,955)	(4,505)	(1,506)
Interest capitalized for real estate under development	(6,884)	(6,260)	(26,290)
Proceeds from disposition of real estate, net	1,064,619	691,526	384,583
Investments in unconsolidated entities	(9,604)	(6,571)	(6,034)
Distributions from unconsolidated entities – return of capital	78,262		334
Purchase of investment securities and other investments	(269)
Net cash provided by (used for) investing activities	(771,824)	(376,834)	(594,296)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(19,812)	(8,583)	(6,289)
Mortgage notes payable, net:
Proceeds	295,771	96,935
Lump sum payoffs	(743,021)	(1,347,939)	(493,420)
Scheduled principal repayments	(6,808)	(6,629)	(10,704)
Notes, net:
Proceeds	1,194,468	896,294	692,466
Lump sum payoffs	(1,050,000)		(497,975)
Line of credit and commercial paper:
Line of credit proceeds	6,010,000	3,805,000	1,845,000
Line of credit repayments	(5,990,000)	(3,805,000)	(1,845,000)
Commercial paper proceeds	15,944,800	14,030,926	5,066,509
Commercial paper repayments	(15,446,150)	(13,831,500)	(4,786,750)
Proceeds from (payments on) settlement of derivative instruments	(41,616)	18,118	1,295
Prepaid finance ground lease	(34,734)
Proceeds from Employee Share Purchase Plan (ESPP)	3,116	3,879	3,744
Proceeds from exercise of options	77,785	30,655	31,596
Payment of offering costs	(991)	(27)	(51)
Other financing activities, net	(80)	(78)	(63)
Acquisition of Noncontrolling Interests – Partially Owned Properties		(13)
Contributions – Noncontrolling Interests – Partially Owned Properties	7,337	125	125
Contributions – Noncontrolling Interests – Operating Partnership	2	1
Distributions:
Common Shares	(831,111)	(782,122)	(739,375)
Preferred Shares	(3,090)	(3,863)	(3,091)
Noncontrolling Interests – Operating Partnership	(29,615)	(28,226)	(27,291)
Noncontrolling Interests – Partially Owned Properties	(7,078)	(9,753)	(8,286)
Net cash provided by (used for) financing activities	(684,474)	(963,910)	(789,818)
Net increase (decrease) in cash and cash equivalents and restricted deposits	686	15,551	(118,326)
Cash and cash equivalents and restricted deposits, beginning of year	116,313	100,762	219,088
Cash and cash equivalents and restricted deposits, end of year	116,999	116,313	100,762
Cash and cash equivalents	45,753	47,442	50,647
Restricted deposits	71,246	68,871	50,115
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	342,048	358,156	360,273
Net cash paid (received) for income and other taxes	(585)	853	640
Amortization of deferred financing costs:
Investment in real estate, net	(120)
Other assets	2,987	2,412	2,412
Mortgage notes payable, net	3,934	4,792	2,493
Notes, net	4,869	4,106	3,621
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	8,618	20,144	1,172
Notes, net	3,162	2,637	2,364
Amortization of deferred settlements on derivative instruments:
Other liabilities	(12)	(12)	(11)
Accumulated other comprehensive income	21,188	18,452	18,858
Write-off of pursuit costs:
Investment in real estate, net	5,451	4,364	2,965
Other assets	62	53	17
Accounts payable and accrued expenses	16	33	124
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	(67,268)	2,304	1,955
Other liabilities	1,323	1,363	1,415
Realized/unrealized (gain) loss on derivative instruments:
Other assets	2,002	(14,977)	(4,582)
Notes, net	2,277	(680)	(3,454)
Other liabilities	29,486	10,533	1,597
Accumulated other comprehensive income	(33,765)	5,174	6,439
Investments in unconsolidated entities:
Investments in unconsolidated entities	(7,504)	(4,891)	(3,034)
Other liabilities	(2,100)	(1,680)	(3,000)
Debt financing costs:
Other assets	(6,909)	(145)
Mortgage notes payable, net	(2,354)	(555)
Notes, net	(10,549)	(7,883)	(6,289)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets	(489,517)
Other assets	184,116
Lease liabilities	333,603
Other liabilities	(28,202)
Proceeds from (payments on) settlement of derivative instruments:
Other assets		18,118	1,295
Other liabilities	(41,616)
Notes, Net [Member]
Mortgage notes payable, net:
Net gain (loss) on debt extinguishment	(10,266)
Mortgage Notes Payable, Net [Member]
Mortgage notes payable, net:
Net gain (loss) on debt extinguishment	$ (3,381)	$ (22,110)	$ (12,258)

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	PREFERRED SHARES	COMMON SHARES, $0.01 PAR VALUE	PAID IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	DISTRIBUTIONS	OPERATING PARTNERSHIP	PARTIALLY OWNED PROPERTIES
Balance, beginning of year at Dec. 31, 2016		$ 37,280	$ 3,659	$ 8,758,422	$ 1,543,626	$ (113,909)
Balance, beginning of year 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
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)
Unrealized holding gains (losses) arising during the year	6,439					6,439
Losses reclassified into earnings from other comprehensive income	(18,858)					18,858
DISTRIBUTIONS
Distributions declared per Common Share outstanding							$ 2.015
NONCONTROLLING INTERESTS
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		37,280	3,680	8,886,586	1,403,530	(88,612)
Balance, end of period at Dec. 31, 2017								226,691	4,708
PARTIALLY OWNED PROPERTIES
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
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
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
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)
Net income attributable to controlling interests	657,535				657,535
Common Share distributions					(796,212)
Preferred Share distributions					(3,090)
Unrealized holding gains (losses) arising during the year	5,174					5,174
Losses reclassified into earnings from other comprehensive income	(18,452)					18,452
Distributions declared per Common Share outstanding							2.16
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)
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	37,280	3,694	8,935,453	1,261,763	(64,986)
Balance, end of period at Dec. 31, 2018	226,445							228,738	(2,293)
PARTIALLY OWNED PROPERTIES
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
Conversion of OP Units into Common Shares			3	10,407
Exercise of share options			17	77,768
Employee Share Purchase Plan (ESPP)			1	3,115
Restricted shares			2	12,436
Share options				2,675
ESPP discount				642
Conversion of OP Units into Common Shares			3	10,407
Exercise of share options			17	77,768
Employee Share Purchase Plan (ESPP)			1	3,115
Offering costs				(991)
Supplemental Executive Retirement Plan (SERP)				(1,675)
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership	82,283			(82,283)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				8,030				(8,030)
Net income attributable to controlling interests	970,377				970,377
Common Share distributions					(842,555)
Preferred Share distributions					(3,090)
Unrealized holding gains (losses) arising during the year	(33,765)					(33,765)
Losses reclassified into earnings from other comprehensive income	(21,188)					21,188
Distributions declared per Common Share outstanding							$ 2.27
Issuance of restricted units to Noncontrolling Interests								2
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(10,410)
Equity compensation associated with Noncontrolling Interests								13,410
Net income attributable to Noncontrolling Interests	36,034							36,034	3,297
Distributions to Noncontrolling Interests								(29,896)	(7,158)
Change in carrying value of Redeemable Noncontrolling Interests – Operating Partnership	2,011							(2,011)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				8,030				(8,030)
Net income attributable to Noncontrolling Interests	36,034							36,034	3,297
Contributions by Noncontrolling Interests									7,337
Distributions to Noncontrolling Interests								(29,896)	(7,158)
Balance, end of period at Dec. 31, 2019	10,315,506	$ 37,280	3,717	8,965,577	$ 1,386,495	$ (77,563)
Balance, end of period at Dec. 31, 2019	$ 229,020							$ 227,837	$ 1,183
PARTIALLY OWNED PROPERTIES
Conversion of OP Units into Common Shares			3	10,407
Exercise of share options			17	77,768
Employee Share Purchase Plan (ESPP)			$ 1	$ 3,115

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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, 2019	Dec. 31, 2018
ASSETS
Land	$ 5,936,188	$ 5,875,803
Depreciable property	21,319,101	20,435,901
Projects under development	181,630	109,409
Land held for development	96,688	89,909
Investment in real estate	27,533,607	26,511,022
Accumulated depreciation	(7,276,786)	(6,696,281)
Investment in real estate, net	20,256,821	19,814,741
Investments in unconsolidated entities	52,238	58,349
Cash and cash equivalents	45,753	47,442
Restricted deposits	71,246	68,871
Right-of-use assets	512,774
Other assets	233,937	404,806
Total assets	21,172,769	20,394,209
Liabilities:
Mortgage notes payable, net	1,941,610	2,385,470
Notes, net	6,077,513	5,933,286
Line of credit and commercial paper	1,017,833	499,183
Accounts payable and accrued expenses	94,350	102,471
Accrued interest payable	66,852	62,622
Lease liabilities	331,334
Other liabilities	346,963	358,563
Security deposits	70,062	67,258
Distributions payable	218,326	206,601
Total liabilities	10,164,843	9,615,454
Commitments and contingencies
Redeemable Limited Partners	463,400	379,106
Partners’ Capital:
Accumulated other comprehensive income (loss)	(77,563)	(64,986)
Noncontrolling Interests – Partially Owned Properties	1,183	(2,293)
Total liabilities and equity/capital	21,172,769	20,394,209
ERPOP [Member]
ASSETS
Land	5,936,188	5,875,803
Depreciable property	21,319,101	20,435,901
Projects under development	181,630	109,409
Land held for development	96,688	89,909
Investment in real estate	27,533,607	26,511,022
Accumulated depreciation	(7,276,786)	(6,696,281)
Investment in real estate, net	20,256,821	19,814,741
Investments in unconsolidated entities	52,238	58,349
Cash and cash equivalents	45,753	47,442
Restricted deposits	71,246	68,871
Right-of-use assets	512,774
Other assets	233,937	404,806
Total assets	21,172,769	20,394,209
Liabilities:
Mortgage notes payable, net	1,941,610	2,385,470
Notes, net	6,077,513	5,933,286
Line of credit and commercial paper	1,017,833	499,183
Accounts payable and accrued expenses	94,350	102,471
Accrued interest payable	66,852	62,622
Lease liabilities	331,334
Other liabilities	346,963	358,563
Security deposits	70,062	67,258
Distributions payable	218,326	206,601
Total liabilities	10,164,843	9,615,454
Commitments and contingencies
Redeemable Limited Partners	463,400	379,106
Partners’ Capital:
Preference Units	37,280	37,280
General Partner	10,355,789	10,200,910
Limited Partners	227,837	228,738
Accumulated other comprehensive income (loss)	(77,563)	(64,986)
Total partners’ capital	10,543,343	10,401,942
Noncontrolling Interests – Partially Owned Properties	1,183	(2,293)
Total capital	10,544,526	10,399,649
Total liabilities and equity/capital	$ 21,172,769	$ 20,394,209

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, 2019	Dec. 31, 2018	Dec. 31, 2017
REVENUES
Rental income	$ 2,700,691	$ 2,577,681	$ 2,470,689
Fee and asset management	$ 384	$ 753	$ 717
Type of Revenue [Extensible List]	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember
Total revenues	$ 2,701,075	$ 2,578,434	$ 2,471,406
EXPENSES
Property and maintenance	446,845	429,335	405,281
Real estate taxes and insurance	366,139	357,814	335,495
Property management	95,344	92,485	85,493
General and administrative	52,757	53,813	52,224
Depreciation	831,083	785,725	743,749
Total expenses	1,792,168	1,719,172	1,622,242
Net gain (loss) on sales of real estate properties	447,637	256,810	157,057
Impairment		(702)	(1,693)
Operating income	1,356,544	1,115,370	1,004,528
Interest and other income	2,817	15,317	6,136
Other expenses	(18,177)	(17,267)	(5,186)
Interest:
Expense incurred, net	(390,076)	(413,360)	(383,890)
Amortization of deferred financing costs	(11,670)	(11,310)	(8,526)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	939,438	688,750	613,062
Income and other tax (expense) benefit	2,281	(878)	(478)
Income (loss) from investments in unconsolidated entities	65,945	(3,667)	(3,370)
Net gain (loss) on sales of land parcels	2,044	987	19,167
Net income	1,009,708	685,192	628,381
Partially Owned Properties	(3,297)	(2,718)	(2,323)
Net income attributable to controlling interests	$ 970,377	$ 657,535	$ 603,454
Earnings per Unit – basic:
Net income available to Units	$ 2.61	$ 1.78	$ 1.64
Earnings per Unit – diluted:
Net income available to Units	$ 2.60	$ 1.77	$ 1.63
Weighted average Units outstanding	386,333	383,695	382,678
ERPOP [Member]
REVENUES
Rental income	$ 2,700,691	$ 2,577,681	$ 2,470,689
Fee and asset management	384	$ 753	$ 717
Type of Revenue [Extensible List]		us-gaap:ManagementServiceMember	us-gaap:ManagementServiceMember
Total revenues	2,701,075	$ 2,578,434	$ 2,471,406
EXPENSES
Property and maintenance	446,845	429,335	405,281
Real estate taxes and insurance	366,139	357,814	335,495
Property management	95,344	92,485	85,493
General and administrative	52,757	53,813	52,224
Depreciation	831,083	785,725	743,749
Total expenses	1,792,168	1,719,172	1,622,242
Net gain (loss) on sales of real estate properties	447,637	256,810	157,057
Impairment		(702)	(1,693)
Operating income	1,356,544	1,115,370	1,004,528
Interest and other income	2,817	15,317	6,136
Other expenses	(18,177)	(17,267)	(5,186)
Interest:
Expense incurred, net	(390,076)	(413,360)	(383,890)
Amortization of deferred financing costs	(11,670)	(11,310)	(8,526)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	939,438	688,750	613,062
Income and other tax (expense) benefit	2,281	(878)	(478)
Income (loss) from investments in unconsolidated entities	65,945	(3,667)	(3,370)
Net gain (loss) on sales of land parcels	2,044	987	19,167
Net income	1,009,708	685,192	628,381
Partially Owned Properties	(3,297)	(2,718)	(2,323)
Net income attributable to controlling interests	1,006,411	682,474	626,058
ALLOCATION OF NET INCOME:
Preference Units	3,090	3,090	3,091
General Partner	967,287	654,445	600,363
Limited Partners	36,034	24,939	22,604
Net income available to Units	$ 1,003,321	$ 679,384	$ 622,967
Earnings per Unit – basic:
Net income available to Units	$ 2.61	$ 1.78	$ 1.64
Weighted average Units outstanding	383,368	380,921	379,869
Earnings per Unit – diluted:
Net income available to Units	$ 2.60	$ 1.77	$ 1.63
Weighted average Units outstanding	386,333	383,695	382,678

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Comprehensive income:
Net income	$ 1,009,708	$ 685,192	$ 628,381
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the year	(33,765)	5,174	6,439
Losses reclassified into earnings from other comprehensive income	21,188	18,452	18,858
Other comprehensive income (loss)	(12,577)	23,626	25,297
Comprehensive income	997,131	708,818	653,678
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(38,872)	(28,526)	(25,845)
Comprehensive income attributable to controlling interests	958,259	680,292	627,833
ERPOP [Member]
Comprehensive income:
Net income	1,009,708	685,192	628,381
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the year	(33,765)	5,174	6,439
Losses reclassified into earnings from other comprehensive income	21,188	18,452	18,858
Other comprehensive income (loss)	(12,577)	23,626	25,297
Comprehensive income	997,131	708,818	653,678
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(3,297)	(2,718)	(2,323)
Comprehensive income attributable to controlling interests	$ 993,834	$ 706,100	$ 651,355

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS OF ERP OPERATING LIMITED PARTNERSHIP $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 1,009,708	$ 685,192	$ 628,381
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	831,083	785,725	743,749
Amortization of deferred financing costs	11,670	11,310	8,526
Amortization of above/below market lease intangibles	(71)	4,392	3,828
Amortization of discounts and premiums on debt	11,780	22,781	3,536
Amortization of deferred settlements on derivative instruments	21,176	18,440	18,847
Amortization of right-of-use assets	11,764
Impairment		702	1,693
Write-off of pursuit costs	5,529	4,450	3,106
(Income) loss from investments in unconsolidated entities	(65,945)	3,667	3,370
Distributions from unconsolidated entities – return on capital	2,621	2,492	2,632
Net (gain) loss on sales of real estate properties	(447,637)	(256,810)	(157,057)
Net (gain) loss on sales of land parcels	(2,044)	(987)	(19,167)
Net (gain) loss on debt extinguishment	13,647	22,110	12,258
Realized/unrealized (gain) loss on derivative instruments		50
Compensation paid with Company Common Shares	24,449	27,132	24,997
Other operating activities, net	287
Changes in assets and liabilities:
(Increase) decrease in other assets	6,278	4,097	(449)
Increase (decrease) in accounts payable and accrued expenses	5,116	(1,862)	11,532
Increase (decrease) in accrued interest payable	4,230	4,587	(2,911)
Increase (decrease) in lease liabilities	(2,269)
Increase (decrease) in other liabilities	13,382	16,578	(23,468)
Increase (decrease) in security deposits	2,804	2,249	2,385
Net cash provided by operating activities	1,456,984	1,356,295	1,265,788
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(1,518,878)	(708,092)	(466,394)
Investment in real estate – development/other	(195,692)	(154,431)	(276,382)
Capital expenditures to real estate	(178,423)	(188,501)	(202,607)
Non-real estate capital additions	(4,955)	(4,505)	(1,506)
Interest capitalized for real estate under development	(6,884)	(6,260)	(26,290)
Proceeds from disposition of real estate, net	1,064,619	691,526	384,583
Investments in unconsolidated entities	(9,604)	(6,571)	(6,034)
Distributions from unconsolidated entities – return of capital	78,262		334
Purchase of investment securities and other investments	(269)
Net cash provided by (used for) investing activities	(771,824)	(376,834)	(594,296)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(19,812)	(8,583)	(6,289)
Mortgage notes payable, net:
Proceeds	295,771	96,935
Lump sum payoffs	(743,021)	(1,347,939)	(493,420)
Scheduled principal repayments	(6,808)	(6,629)	(10,704)
Notes, net:
Proceeds	1,194,468	896,294	692,466
Lump sum payoffs	(1,050,000)		(497,975)
Line of credit and commercial paper:
Line of credit proceeds	6,010,000	3,805,000	1,845,000
Line of credit repayments	(5,990,000)	(3,805,000)	(1,845,000)
Commercial paper proceeds	15,944,800	14,030,926	5,066,509
Commercial paper repayments	(15,446,150)	(13,831,500)	(4,786,750)
Proceeds from (payments on) settlement of derivative instruments	(41,616)	18,118	1,295
Prepaid finance ground lease	(34,734)
Proceeds from Employee Share Purchase Plan (ESPP)	3,116	3,879	3,744
Proceeds from exercise of EQR options	77,785	30,655	31,596
Payment of offering costs	(991)	(27)	(51)
Other financing activities, net	(80)	(78)	(63)
Acquisition of Noncontrolling Interests – Partially Owned Properties		(13)
Contributions – Noncontrolling Interests – Partially Owned Properties	7,337	125	125
Contributions – Limited Partners	2	1
Distributions:
OP Units – General Partner	(831,111)	(782,122)	(739,375)
Preference Units	(3,090)	(3,863)	(3,091)
OP Units – Limited Partners	(29,615)	(28,226)	(27,291)
Noncontrolling Interests – Partially Owned Properties	(7,078)	(9,753)	(8,286)
Net cash provided by (used for) financing activities	(684,474)	(963,910)	(789,818)
Net increase (decrease) in cash and cash equivalents and restricted deposits	686	15,551	(118,326)
Cash and cash equivalents and restricted deposits, beginning of year	116,313	100,762	219,088
Cash and cash equivalents and restricted deposits, end of year	116,999	116,313	100,762
Cash and cash equivalents	45,753	47,442	50,647
Restricted deposits	71,246	68,871	50,115
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	342,048	358,156	360,273
Net cash paid (received) for income and other taxes	(585)	853	640
Amortization of deferred financing costs:
Investment in real estate, net	120
Other assets	2,987	2,412	2,412
Mortgage notes payable, net	3,934	4,792	2,493
Notes, net	4,869	4,106	3,621
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	8,618	20,144	1,172
Notes, net	3,162	2,637	2,364
Amortization of deferred settlements on derivative instruments:
Other liabilities	(12)	(12)	(11)
Accumulated other comprehensive income	21,188	18,452	18,858
Write-off of pursuit costs:
Investment in real estate, net	5,451	4,364	2,965
Other assets	62	53	17
Accounts payable and accrued expenses	16	33	124
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	(67,268)	2,304	1,955
Other liabilities	1,323	1,363	1,415
Realized/unrealized (gain) loss on derivative instruments:
Other assets	2,002	(14,977)	(4,582)
Notes, net	2,277	(680)	(3,454)
Other liabilities	29,486	10,533	1,597
Accumulated other comprehensive income	(33,765)	5,174	6,439
Investments in unconsolidated entities:
Investments in unconsolidated entities	(7,504)	(4,891)	(3,034)
Other liabilities	(2,100)	(1,680)	(3,000)
Debt financing costs:
Other assets	(6,909)	(145)
Mortgage notes payable, net	2,354	555
Notes, net	(10,549)	(7,883)	(6,289)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets	(489,517)
Other assets	184,116
Lease liabilities	333,603
Other liabilities	28,202
Proceeds from (payments on) settlement of derivative instruments:
Other assets		18,118	1,295
Other liabilities	41,616
Mortgage Notes Payable, Net [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Net gain (loss) on debt extinguishment	(3,381)	(22,110)	(12,258)
ERPOP [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	1,009,708	685,192	628,381
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	831,083	785,725	743,749
Amortization of deferred financing costs	11,670	11,310	8,526
Amortization of above/below market lease intangibles	(71)	4,392	3,828
Amortization of discounts and premiums on debt	11,780	22,781	3,536
Amortization of deferred settlements on derivative instruments	21,176	18,440	18,847
Amortization of right-of-use assets	11,764
Impairment		702	1,693
Write-off of pursuit costs	5,529	4,450	3,106
(Income) loss from investments in unconsolidated entities	(65,945)	3,667	3,370
Distributions from unconsolidated entities – return on capital	2,621	2,492	2,632
Net (gain) loss on sales of real estate properties	(447,637)	(256,810)	(157,057)
Net (gain) loss on sales of land parcels	(2,044)	(987)	(19,167)
Net (gain) loss on debt extinguishment	13,647	22,110	12,258
Realized/unrealized (gain) loss on derivative instruments		50
Compensation paid with Company Common Shares	24,449	27,132	24,997
Other operating activities, net	287
Changes in assets and liabilities:
(Increase) decrease in other assets	6,278	4,097	(449)
Increase (decrease) in accounts payable and accrued expenses	5,116	(1,862)	11,532
Increase (decrease) in accrued interest payable	4,230	4,587	(2,911)
Increase (decrease) in lease liabilities	(2,269)
Increase (decrease) in other liabilities	13,382	16,578	(23,468)
Increase (decrease) in security deposits	2,804	2,249	2,385
Net cash provided by operating activities	1,456,984	1,356,295	1,265,788
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(1,518,878)	(708,092)	(466,394)
Investment in real estate – development/other	(195,692)	(154,431)	(276,382)
Capital expenditures to real estate	(178,423)	(188,501)	(202,607)
Non-real estate capital additions	(4,955)	(4,505)	(1,506)
Interest capitalized for real estate under development	(6,884)	(6,260)	(26,290)
Proceeds from disposition of real estate, net	1,064,619	691,526	384,583
Investments in unconsolidated entities	(9,604)	(6,571)	(6,034)
Distributions from unconsolidated entities – return of capital	78,262		334
Purchase of investment securities and other investments	(269)
Net cash provided by (used for) investing activities	(771,824)	(376,834)	(594,296)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(19,812)	(8,583)	(6,289)
Net gain (loss) on debt extinguishment	(10,266)
Mortgage notes payable, net:
Proceeds	295,771	96,935
Lump sum payoffs	(743,021)	(1,347,939)	(493,420)
Scheduled principal repayments	(6,808)	(6,629)	(10,704)
Notes, net:
Proceeds	1,194,468	896,294	692,466
Lump sum payoffs	(1,050,000)		(497,975)
Line of credit and commercial paper:
Line of credit proceeds	6,010,000	3,805,000	1,845,000
Line of credit repayments	(5,990,000)	(3,805,000)	(1,845,000)
Commercial paper proceeds	15,944,800	14,030,926	5,066,509
Commercial paper repayments	(15,446,150)	(13,831,500)	(4,786,750)
Proceeds from (payments on) settlement of derivative instruments	(41,616)	18,118	1,295
Prepaid finance ground lease	(34,734)
Proceeds from Employee Share Purchase Plan (ESPP)	3,116	3,879	3,744
Proceeds from exercise of EQR options	77,785	30,655	31,596
Payment of offering costs	(991)	(27)	(51)
Other financing activities, net	(80)	(78)	(63)
Acquisition of Noncontrolling Interests – Partially Owned Properties		(13)
Contributions – Noncontrolling Interests – Partially Owned Properties	7,337	125	125
Contributions – Limited Partners	2	1
Distributions:
OP Units – General Partner	(831,111)	(782,122)	(739,375)
Preference Units	(3,090)	(3,863)	(3,091)
OP Units – Limited Partners	(29,615)	(28,226)	(27,291)
Noncontrolling Interests – Partially Owned Properties	(7,078)	(9,753)	(8,286)
Net cash provided by (used for) financing activities	(684,474)	(963,910)	(789,818)
Net increase (decrease) in cash and cash equivalents and restricted deposits	686	15,551	(118,326)
Cash and cash equivalents and restricted deposits, beginning of year	116,313	100,762	219,088
Cash and cash equivalents and restricted deposits, end of year	116,999	116,313	100,762
Cash and cash equivalents	45,753	47,442	50,647
Restricted deposits	71,246	68,871	50,115
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	342,048	358,156	360,273
Net cash paid (received) for income and other taxes	(585)	853	640
Amortization of deferred financing costs:
Investment in real estate, net	(120)
Other assets	2,987	2,412	2,412
Mortgage notes payable, net	3,934	4,792	2,493
Notes, net	4,869	4,106	3,621
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	8,618	20,144	1,172
Notes, net	3,162	2,637	2,364
Amortization of deferred settlements on derivative instruments:
Other liabilities	(12)	(12)	(11)
Accumulated other comprehensive income	21,188	18,452	18,858
Write-off of pursuit costs:
Investment in real estate, net	5,451	4,364	2,965
Other assets	62	53	17
Accounts payable and accrued expenses	16	33	124
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	(67,268)	2,304	1,955
Other liabilities	1,323	1,363	1,415
Realized/unrealized (gain) loss on derivative instruments:
Other assets	2,002	(14,977)	(4,582)
Notes, net	2,277	(680)	(3,454)
Other liabilities	29,486	10,533	1,597
Accumulated other comprehensive income	(33,765)	5,174	6,439
Investments in unconsolidated entities:
Investments in unconsolidated entities	(7,504)	(4,891)	(3,034)
Other liabilities	(2,100)	(1,680)	(3,000)
Debt financing costs:
Other assets	(6,909)	(145)
Mortgage notes payable, net	(2,354)	(555)
Notes, net	(10,549)	(7,883)	(6,289)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets	(489,517)
Other assets	184,116
Lease liabilities	333,603
Other liabilities	(28,202)
Proceeds from (payments on) settlement of derivative instruments:
Other assets		18,118	1,295
Other liabilities	(41,616)
ERPOP [Member] | Mortgage Notes Payable, Net [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Net gain (loss) on debt extinguishment	$ (3,381)	$ (22,110)	$ (12,258)

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 PartnerERPOP [Member]	AOCI Attributable to ParentERPOP [Member]	DISTRIBUTIONS [Member]	PARTIALLY OWNED PROPERTIES [Member]ERPOP [Member]
Balance, beginning of year at Dec. 31, 2016			$ 37,280		$ 10,305,707	$ 221,297	$ (113,909)
Balance, beginning 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
Net income available to Units - 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
DISTRIBUTIONS
Distributions declared per Unit outstanding								$ 2.015
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	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
Net income available to Units - 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
DISTRIBUTIONS
Distributions declared per Unit outstanding								2.16
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	685,192	685,192							2,718
Acquisition Noncontrolling Interests Partially Owned Properties									(13)
Contributions by Noncontrolling Interests									125
Distributions to Noncontrolling Interests									(9,831)
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)
OP Unit Issuance:
Conversion of OP Units held by Limited Partners into OP Units held by General Partner					10,410	(10,410)
Exercise of EQR share options					77,785
EQR's Employee Share Purchase Plan (ESPP)				$ 3,116
Share-based employee compensation expense:
EQR restricted shares					12,438
EQR share options					2,675
EQR ESPP discount					642
Net income available to Units - General Partner		967,287			967,287
OP Units - General Partner distributions					(842,555)
Offering costs					(991)
Supplemental Executive Retirement Plan (SERP)					(1,675)
Change in market value of Redeemable Limited Partners					(82,283)
Adjustment for Limited Partners ownership in Operating Partnership					8,030	(8,030)
LIMITED PARTNERS
Issuance of restricted units to Limited Partners						2
Conversion of OP Units held by Limited Partners into OP Units held by General Partner					10,410	(10,410)
Equity compensation associated with Units - Limited Partners						13,410
Net income available to Units - Limited Partners		36,034				36,034
Units - Limited Partners distributions						(29,896)
Change in carrying value of Redeemable Limited Partners						(2,011)
Adjustment for Limited Partners ownership in Operating Partnership					8,030	(8,030)
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) arising during the year	(33,765)	(33,765)					(33,765)
Losses reclassified into earnings from other comprehensive income	(21,188)	(21,188)					21,188
DISTRIBUTIONS
Distributions declared per Unit outstanding								$ 2.27
NONCONTROLLING INTERESTS PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	$ 1,009,708	$ 1,009,708							3,297
Contributions by Noncontrolling Interests									7,337
Distributions to Noncontrolling Interests									(7,158)
Balance, end of year at Dec. 31, 2019			$ 37,280		$ 10,355,789	$ 227,837	$ (77,563)
Balance, end of year at Dec. 31, 2019									$ 1,183

Business

Business	12 Months Ended
	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Business	1. Business 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 communities, 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, 2019 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 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, 2019, the Company, directly or indirectly through investments in title holding entities, owned all or a portion of 309 properties located in 10 states and the District of Columbia consisting of 79,962 apartment units. The ownership breakdown includes (table does not include various uncompleted development properties): Properties Apartment Units Wholly Owned Properties 291 76,265 Master-Leased Property – Consolidated 1 162 Partially Owned Properties – Consolidated 17 3,535 309 79,962 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.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
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 any unconsolidated properties/entities. Real Estate Assets and Depreciation of Investment in Real Estate The Company expects that substantially all of its transactions will be accounted for as asset acquisitions. In an asset acquisition, the Company is required to capitalize transaction costs and allocate the purchase price on a relative fair value basis. For the years ended December 31, 2019 and 2018, all acquisitions were considered asset acquisitions. 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 units 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 8 for more information on ground lease intangibles. • 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. • 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 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. 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 investment 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, legal, regulatory and environmental concerns, the Company’s intent and ability to hold the related asset, as well as any significant cost overruns on development properties. 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 make an estimate of the fair value for the particular asset and would record an impairment loss for the difference between the estimated fair value and the carrying amount of the asset. In determining the future undiscounted cash flows or the estimated fair value of an asset there is judgment in estimating the expected future rental revenues, operating expenses and discount and capitalization rates. • 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, 2019, 2018 and 2017, the Company capitalized $14.2 million, $13.2 million and $14.7 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 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 Deposit 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 may seek 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 derivative 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. Leases and 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 leases (including commercial leases) is also recorded on a straight-line basis. Retail 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. The majority of the Company’s revenue is derived from residential, retail and other lease income, which are accounted for under the new leasing standard effective January 1, 2019 (discussed below in Recently Adopted Accounting Pronouncements The Company is a lessor for its residential and retail leases and is a lessee for its corporate headquarters and regional offices and ground leases for land underlying current operating properties or projects under development. If applicable, lease agreements must be evaluated to determine the accounting treatment as a finance or operating lease in accordance with the new leasing standard. A lease is classified as a finance lease if it meets any of the following criteria: (a) Ownership of the underlying asset is transferred to the lessee by the end of the lease term; (b) the lessee has and is reasonably certain to exercise an option to purchase the underlying asset; (c) the lease term is for the major part of the remaining economic life of the underlying asset; (d) the present value of future minimum lease payments is equal to substantially all of the fair value of the underlying asset; and (e) the underlying asset is expected to have no alternative use to the lessor at the end of the lease term due to its specialized nature. The new leasing standard also requires the recognition on the balance sheet of: (a) a liability for the lease obligation (initially measured at the present value of the future lease payments not yet paid over the lease term); and (b) an asset for its right to use the underlying asset (initially equal to the lease liability). See Recently Adopted Accounting Pronouncements The Company’s revenue streams that are not accounted for under the new leasing standard include: • Parking revenue – The Company’s parking revenue, not related to leasing, is derived primarily from monthly and transient daily parking and is accounted for at the point in time when control of the goods or services transfers to the customer and our performance obligation is satisfied. • Other rental and non-rental related revenue – The Company receives other income, including, but not limited to: (a) ancillary income, such as laundry, renters insurance and cable income; (b) net settlement income or collections; and (c) miscellaneous fee income. • Fee and asset management revenue – The Company received management fee revenue as the property manager for two unconsolidated joint ventures for which it had an ownership interest during part of the year but no longer owns as of December 31, 2019. • Gains or losses on sales of real estate properties – The Company accounts for the sale of real estate properties and any related gain recognition in accordance with the accounting guidance applicable to sales of real estate, which establishes standards for recognition of profit on all real estate sales transactions. The Company recognizes the sale, and associated gain or loss from the disposition, provided that the earnings process is complete and the Company does not have significant continuing involvement. A gain or loss is recognized when the criteria for an asset to be derecognized are met, which include when a contract exists and the buyer obtained control of the nonfinancial asset that was sold. The Company’s rental income detail by leasing and revenue recognition standards along with the percentages of rental income are disclosed in the table below for the years ended December 31, 2019 and 2018 (amounts in thousands). Year Ended December 31, 2019 Year Ended December 31, 2018 Income Type $ Rental Income % of Rental Income $ Rental Income % of Rental Income Residential and retail rent $ 2,486,189 $ 2,369,552 Utility recoveries ("RUBS") 68,576 63,218 Parking rent 37,905 33,757 Storage rent 3,816 3,674 Pet rent 11,617 11,185 Leasing standard (1) 2,608,103 96.6 % 2,481,386 96.3 % Parking revenue 28,272 26,743 Other revenue 64,316 69,552 Revenue recognition standard 92,588 3.4 % 96,295 3.7 % Rental income $ 2,700,691 100.0 % $ 2,577,681 100.0 % (1) See Note 8 for additional details on leasing revenue. 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 is 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: 2019 2018 2017 Expected volatility (1) 16.3 % 14.8 % 15.3 % Expected life (2) 5 years 5 years 5 years Expected dividend yield (3) 3.10 % 3.09 % 3.08 % Risk-free interest rate (4) 2.43 % 2.52 % 1.93 % Option valuation per share $ 8.06 $ 6.15 $ 5.86 (1) Expected volatility – Estimated based on the historical five-year (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 at 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 EQR has elected to be taxed as a REIT. This, along with the nature of the operations of its operating properties, resulted in no provision for federal income taxes being 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. The Company’s provision for income and other tax expense (benefit) was as follows for the years ended December 31, 2019, 2018 and 2017 (amounts in thousands): Year Ended December 31, 2019 2018 2017 State and local income, franchise and excise tax (benefit) $ 963 $ 878 $ 478 Alternative minimum tax credit (benefit) (1) (3,244 ) — — Income and other tax expense (benefit) (2) $ (2,281 ) $ 878 $ 478 (1) As provided in recent tax legislation which repealed the alternative minimum tax on corporations, in 2019 the Company claimed/received $1.6 million of refunds of various alternative minimum tax credit carryovers generated in prior tax years. The provision allows for carryover amounts to be refunded over four years, with 50% available in the first year. The remaining $1.6 million, which will be claimed over three years, was accrued in 2019, for a total expected benefit of $3.2 million. (2) All provisions for income tax amounts are current and none are deferred. During the years ended December 31, 2019, 2018 and 2017, the tax character of the Company’s dividends and distributions were as follows (unaudited): Year Ended December 31, 2019 (1) 2018 (2) 2017 (3) Tax character of dividends and distributions: Ordinary dividends $ 1.39604 $ 1.84454 $ 1.22126 Long-term capital gain 0.61243 0.21423 0.18959 Unrecaptured section 1250 gain 0.23403 0.06498 0.10040 Dividends and distributions per Common Share/Unit outstanding $ 2.24250 $ 2.12375 $ 1.51125 (1) The Company’s fourth quarter 2019 dividends and distributions of $0.5675 per Common Share/Unit outstanding will be included as taxable income in calendar year 2020. (2) The Company’s fourth quarter 2018 dividends and distributions of $0.54 per Common Share/Unit outstanding was included as taxable income in calendar year 2019. (3 ) The Company’s fourth quarter 2017 dividends and distributions of $0.50375 per Common Share/Unit outstanding was 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, 2019 and 2018 was approximately $13.7 billion and $14.0 billion, respectively. Principles of Consolidation The Company may hold an interest in subsidiaries, partnerships, joint ventures and other similar entities and accounts for these interests in accordance with the consolidation guidance. The Company first determines whether to consolidate the entity as a variable interest entity (“VIE”) or account for the interest under the equity method of accounting. Equity investors of VIEs do not have sufficient equity at risk to finance their activities without additional subordinated financial support or do not have substantive participating rights. The Company consolidates an entity when it is considered to be the primary beneficiary or when it controls the entity through ownership of a majority voting interest. A primary beneficiary has the power to direct the activities that most significantly impact the VIE’s performance and has the obligation to absorb the expected losses or the right to receive the expected residual returns that could potentially be significant to the VIE. In evaluating whether the entity is a VIE, the Company considers several factors, including, but not limited to, funding and financing sources, business purpose of the entity, related parties, developer and property management fees and agreement terms regarding major decisions, participating and voting rights, contributions and distributions. 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 June 2016, the Financial Accounting Standards Board (“ FASB”) Recently Adopted Accounting Pronouncements In FASB Revenue from Contracts with Customers Additionally, as part of the revenue recognition standard, the FASB issued amendments related to partial sales of real estate. Adoption of the 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 standards. In February 2016, the FASB issued a leases standard which sets out principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessors and lessees). The standard requires the following: • 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 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 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 Company adopted this standard as required effective January 1, 2019 using a modified retrospective method and the Company applied the guidance as of the adoption date and elected certain practical expedients, as described below. The standard impacted our consolidated balance sheets but did not impact our consolidated statements of operations. Right-of-use (“ROU”) assets and lease liabilities where the Company is the lessee were recognized for various corporate office leases and ground leases. The Company recorded ROU assets and related lease liabilities to its opening balance sheet upon adoption on January 1, 2019 of $434.2 million and $278.3 million, respectively. The Company calculated the net present value of the lease liabilities on January 1, 2019 and reclassed the following amounts from other assets and other liabilities to record our initial ROU assets (amounts in thousands): January 1, 2019 Balance Sheet Reclass: Initial lease liabilities $ 278,287 Reclassifications: Prepaid ground leases 17,886 Other Assets Ground lease intangibles – below market, net 166,230 Other Assets Ground lease intangibles – above market, net (2,110 ) Other Liabilities Straight-line rent liabilities (1) (26,092 ) Other Liabilities Initial right-of-use assets $ 434,201 (1) Straight-line rent liabilities relate to corporate office leases and certain ground leases. The Company elected the practical expedient to not reassess the classification of existing operating leases. As of January 1, 2019, any new or modified ground leases may be classified as financing leases unless they meet certain conditions. When there is a material lease modification, the Company is required to reassess the classification and remeasure the lease liability. In July 2018, the FASB issued an amendment to the 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 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. See Note 8 for additional discussion regarding the new lease standard. 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 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 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 standard as required effective January 1, 2019 and it did not have a material effect on its consolidated results of operations or financial position. Other The Company is the controlling partner in various consolidated partnerships owning 17 properties consisting of 3,535 apartment units having a noncontrolling interest balance of $1.2 million at December 31, 2019. The Company is required to make certain disclosures regarding noncontrolling interests in consolidated limited-life subsidiaries. Of the consolidated

Equity, Capital and Other Inter

Equity, Capital and Other Interests	12 Months Ended
	Dec. 31, 2019
Equity Capital And Other Interests [Abstract]
Equity, Capital and Other Interests	3. Equity, Capital and Other Interests The Company refers to “Common Shares” and “Units” (which refer to both OP Units and restricted units) as equity securities for EQR and “General Partner Units” and “Limited Partner Units” as equity securities for ERPOP. To provide a streamlined and more readable presentation of the disclosures for the Company and the Operating Partnership, several sections below refer to the respective terminology for each with the same financial information and separate sections are provided, where needed, to further distinguish any differences in financial information and terminology. The following table presents the changes in the Company’s issued and outstanding Common Shares and Units for the years ended December 31, 2019, 2018 and 2017: 2019 2018 2017 Common Shares Common Shares outstanding at January 1, 369,405,161 368,018,082 365,870,924 Common Shares Issued: Conversion of OP Units 313,940 131,477 1,149,284 Exercise of share options 1,745,050 1,056,388 846,137 Employee Share Purchase Plan (ESPP) 48,131 75,414 68,286 Restricted share grants, net 158,602 123,800 83,451 Common Shares outstanding at December 31, 371,670,884 369,405,161 368,018,082 Units Units outstanding at January 1, 13,904,035 13,768,438 14,626,075 Restricted unit grants, net 141,220 267,074 291,647 Conversion of OP Units to Common Shares (313,940 ) (131,477 ) (1,149,284 ) Units outstanding at December 31, 13,731,315 13,904,035 13,768,438 Total Common Shares and Units outstanding at December 31, 385,402,199 383,309,196 381,786,520 Units Ownership Interest in Operating Partnership 3.6 % 3.6 % 3.6 % The following table presents the changes in the Operating Partnership’s issued and outstanding General Partner Units and Limited Partner Units for the years ended December 31, 2019, 2018 and 2017: 2019 2018 2017 General and Limited Partner Units General and Limited Partner Units outstanding at January 1, 383,309,196 381,786,520 380,496,999 Issued to General Partner: Exercise of EQR share options 1,745,050 1,056,388 846,137 EQR’s Employee Share Purchase Plan (ESPP) 48,131 75,414 68,286 EQR’s restricted share grants, net 158,602 123,800 83,451 Issued to Limited Partners: Restricted unit grants, net 141,220 267,074 291,647 General and Limited Partner Units outstanding at December 31, 385,402,199 383,309,196 381,786,520 Limited Partner Units Limited Partner Units outstanding at January 1, 13,904,035 13,768,438 14,626,075 Limited Partner restricted unit grants, net 141,220 267,074 291,647 Conversion of Limited Partner OP Units to EQR Common Shares (313,940 ) (131,477 ) (1,149,284 ) Limited Partner Units outstanding at December 31, 13,731,315 13,904,035 13,768,438 Limited Partner Units Ownership Interest in Operating Partnership 3.6 % 3.6 % 3.6 % 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” and “Limited Partners Capital,” respectively, for the Company and the Operating Partnership. Subject to certain exceptions (including the “book-up” requirements of restricted units), the Noncontrolling Interests – Operating Partnership/Limited Partners Capital may exchange their Units with EQR for Common Shares on a one-for-one basis. The carrying value of the Noncontrolling Interests – Operating Partnership/Limited Partners Capital (including redeemable interests) is allocated based on the number of Noncontrolling Interests – Operating Partnership/Limited Partners Capital in total in proportion to the number of Noncontrolling Interests – Operating Partnership/Limited Partners Capital in total plus the total number of Common Shares/General Partner Units. Net income is allocated to the Noncontrolling Interests – Operating Partnership/Limited Partners Capital 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 Interes ts – Operating Partnership /Limited Partner s Capital requesting an exchange of their Noncontrolling Interes ts – Operating Partnership /Limited Partner s Capital with EQR. Once the Operating Partnership elects not to redeem the Noncontrolling Interes ts – Operating Partnership /Limited Partner s Capital for cash, EQR is obligated to deliver Common Shares to the exchanging holder of the Noncontrolling Interes ts – Operating Partnership /Limited Partner s Capital . The Noncontrolling Interests – Operating Partnership/Limited Partners Capital 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/Limited Partners Capital are differentiated and referred to as “Redeemable Noncontrolling Interests – Operating Partnership” and “Redeemable Limited Partners,” respectively. 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/Redeemable Limited Partners 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/Limited Partners Capital that are classified in permanent equity at December 31, 2019 and 2018. The carrying value of the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners is allocated based on the number of Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners in proportion to the number of Noncontrolling Interests – Operating Partnership/Limited Partners Capital in total. Such percentage of the total carrying value of Units/Limited Partner Units which is ascribed to the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners is then adjusted to the greater of carrying value or fair market value as described above. As of December 31, 2019 and 2018, the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners have a redemption value of approximately $463.4 million and $379.1 million, respectively, which represents the value of Common Shares that would be issued in exchange for the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners. The following table presents the changes in the redemption value of the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners for the years ended December 31, 2019, 2018 and 2017, respectively (amounts in thousands): 2019 2018 2017 Balance at January 1, $ 379,106 $ 366,955 $ 442,092 Change in market value 82,283 13,922 (41,916 ) Change in carrying value 2,011 (1,771 ) (33,221 ) Balance at December 31, $ 463,400 $ 379,106 $ 366,955 Net proceeds from EQR Common Share and Preferred Share (see definition below) offerings and proceeds from exercise of options for Common Shares 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 proceeds from Common Shares and Preferred Shares are allocated for the Company between shareholders’ equity and Noncontrolling Interests – Operating Partnership and for the Operating Partnership between General Partner’s Capital and Limited Partners Capital to account for the change in their respective percentage ownership of the underlying equity. 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/Preference Units as of December 31, 2019 and 2018: Amounts in thousands Annual Call Dividend Per December 31, December 31, Date (1) Share/Unit (2) 2019 2018 Preferred Shares/Preference Units of beneficial interest, $0.01 par value; 100,000,000 shares authorized: 8.29% Series K Cumulative Redeemable Preferred Shares/Preference Units; liquidation value $50 per share/unit; 745,600 shares/units issued and outstanding as of December 31, 2019 and 2018 12/10/26 $ 4.145 $ 37,280 $ 37,280 $ 37,280 $ 37,280 (1) On or after the call date, redeemable Preferred Shares/Preference Units may be redeemed for cash at the option of the Company or the Operating Partnership, respectively, in whole or in part, at a redemption price equal to the liquidation price per share/unit, plus accrued and unpaid distributions, if any. (2) Dividends on Preferred Shares/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 in June 2019 and expires in June 2022. 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). The Company has an At-The-Market (“ATM”) share offering program which allows EQR to sell Common Shares from time to time into the existing trading market at current market prices as well as through negotiated transactions. In June 2019, the Company extended the program maturity to June 2022. In connection with the extension, the Company may now also sell Common Shares under forward sale agreements. The use of a forward sale agreement would allow the Company to lock in a price on the sale of Common Shares at the time the agreement is executed, but defer receiving the proceeds from the sale until a later date. 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, 2019, EQR has remaining authorization to repurchase up to 13.0 million of its shares.

Real Estate

Real Estate	12 Months Ended
	Dec. 31, 2019
Real Estate [Abstract]
Real Estate	4. Real Estate The following table summarizes the carrying amounts for the Company’s investment in real estate (at cost) as of December 31, 2019 and 2018 (amounts in thousands): 2019 2018 Land $ 5,936,188 $ 5,875,803 Depreciable property: Buildings and improvements 18,904,686 18,232,625 Furniture, fixtures and equipment 1,916,458 1,722,231 In-Place lease intangibles 497,957 481,045 Projects under development: Land 23,531 25,429 Construction-in-progress 158,099 83,980 Land held for development: Land 64,460 61,038 Construction-in-progress 32,228 28,871 Investment in real estate 27,533,607 26,511,022 Accumulated depreciation (7,276,786 ) (6,696,281 ) Investment in real estate, net $ 20,256,821 $ 19,814,741 Acquisitions and Dispositions During the year ended December 31, 2019, the Company acquired the following from unaffiliated parties (purchase price in thousands): Properties Apartment Units Purchase Price Rental Properties – Consolidated (1) 13 3,540 $ 1,494,689 Land Parcels (four) (2) — — 19,832 Total 13 3,540 $ 1,514,521 (1) Purchase price includes an allocation of approximately $268.3 million to land and $1.229 billion to depreciable property (inclusive of capitalized closing costs). (2) Purchase price includes an allocation of approximately $16.7 million to vacant land and $4.9 million to construction-in-progress (inclusive of capitalized closing costs). Land parcels include entry into two long-term ground leases for land projects under development in the Washington D.C. market, of which one land parcel is subject to a fully prepaid ground lease. See Notes 6 and 8 for additional discussion. During the year ended December 31, 2018, the Company acquired 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, 2019, the Company disposed of the following to unaffiliated parties (sales price in thousands): Properties Apartment Units Sales Price Rental Properties – Consolidated 11 2,361 $ 1,080,675 Rental Properties – Unconsolidated (1) 2 945 394,500 Land Parcels (two) — — 2,100 Total 13 3,306 $ 1,477,275 (1) The Company owned a 20% interest in both unconsolidated rental properties. Sales price listed is the gross sales price. The Company received net sales proceeds of approximately $78.3 million. The Company recognized a net gain on sales of real estate properties of approximately $447.6 million, a net gain on sales of unconsolidated entities of approximately $69.5 million and a net gain on sales of land parcels of approximately $2.0 million on the above sales. 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. 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 was sold in 2019 .

Commitments to Acquire_Dispose

Commitments to Acquire/Dispose of Real Estate	12 Months Ended
	Dec. 31, 2019
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 agreements to acquire rental properties or land parcels as of the date of 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 4 1,416 $ 723,500 Land Parcels (two) — — 55,150 Total 4 1,416 $ 778,650 The closing of pending transactions is subject to certain conditions and restrictions; therefore, there can be no assurance that the transactions will be consummated or that the final terms will not differ in material respects from any agreements summarized above. See Note 18 for discussion of the properties acquired or disposed of, if any, subsequent to December 31, 2019.

Investments in Partially Owned

Investments in Partially Owned Entities	12 Months Ended
	Dec. 31, 2019
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 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. During the year ended December 31, 2019, the Company entered into two consolidated joint ventures, both of which have been deemed to be VIEs and are consolidated due to the Company being the primary beneficiary. The joint ventures own two separate land parcels which they are currently developing into multifamily rental properties. The consolidated assets and liabilities related to the VIEs discussed above were approximately $754.7 million and $323.1 million, respectively, at December 31, 2019 and approximately $713.6 million and $313.9 million, respectively, at December 31, 2018. 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, 2019 December 31, 2018 December 31, 2019 December 31, 2018 Ownership Percentage Investments in Unconsolidated Entities: Operating Property (VIE) (1) $ 40,361 $ 42,365 33.3% Operating Properties (Non-VIE) (2) — 10,494 20.0% Real Estate Technology/Other 11,877 5,490 Varies Investments in Unconsolidated Entities $ 52,238 $ 58,349 (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 as of December 31, 2018. During the year ended December 31, 2019, the Company and its joint venture partner sold both properties under separate agreements to unaffiliated parties. See Note 4 for additional discussion.

Restricted Deposits

Restricted Deposits	12 Months Ended
	Dec. 31, 2019
Deposits Restricted [Abstract]
Restricted Deposits	7. Restricted Deposits The following table presents the Company’s restricted deposits as of December 31, 2019 and 2018 (amounts in thousands): December 31, 2019 December 31, 2018 Mortgage escrow deposits: Real estate taxes and insurance $ — $ 876 Replacement reserves 8,543 8,641 Mortgage principal reserves/sinking funds 9,689 9,754 Other — 852 Mortgage escrow deposits 18,232 20,123 Restricted cash: Tax-deferred (1031) exchange proceeds 14,232 — Earnest money on pending acquisitions — 5,000 Restricted deposits on real estate investments 658 540 Resident security and utility deposits 37,140 35,659 Other 984 7,549 Restricted cash 53,014 48,748 Restricted deposits $ 71,246 $ 68,871

Leases

Leases	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Leases	8 . Leases Lessor Accounting The Company is the lessor for its residential and retail leases (including commercial leases) and these leases will continue to be accounted for as operating leases under the new standard as described in Note 2. Therefore, the Company did not have significant changes in the accounting for its lease revenues. For the year ended December 31, 2019, approximately 97% of the Company’s total lease revenue is generated from residential apartment leases that are generally twelve months or less in length. The residential apartment leases may include lease income related to such items as RUBS income, parking, storage and pet rent that the Company treats as a single lease component because the amenities cannot be leased on their own and the timing and pattern of revenue recognition are the same. The collection of lease payments at lease commencement is probable and therefore the Company subsequently recognizes lease income over the lease term on a straight-line basis. Residential leases are renewable upon consent of both parties on an annual or monthly basis. For the year ended December 31, 2019, approximately 3% of the Company’s total lease revenue is generated by retail leases that are generally for terms ranging between five to ten years. The retail leases generally consist of ground floor retail spaces and master-leased parking garages that serve as additional amenities for our residents. The retail leases may include lease income related to such items as RUBS income, parking rent and storage rent that the Company treats as a single lease component because the amenities cannot be leased on their own and the timing and pattern of revenue recognition are the same. The collection of lease payments at lease commencement is probable and therefore the Company subsequently recognizes lease income over the lease term on a straight-line basis. Retail leases are renewable with market-based renewal options. The Company elected the practical expedient to account for both its lease and non-lease components (specifically common area maintenance charges) as a single lease component under the leases standard. The following table presents the lease income types relating to lease payments for residential and retail leases for the year ended December 31, 2019 (amounts in thousands): Year Ended December 31, 2019 Lease Income Type Residential Leases Retail Leases Total Residential and retail rent $ 2,414,201 $ 71,988 $ 2,486,189 Utility recoveries (RUBS income) (1) 67,659 917 68,576 Parking rent 37,557 348 37,905 Storage rent 3,745 71 3,816 Pet rent 11,617 — 11,617 Total lease revenue (2) $ 2,534,779 $ 73,324 $ 2,608,103 (1) RUBS income primarily consists of variable payments representing the recovery of utility costs from residents. (2 ) Excludes other rental income of $92.6 million for the year ended December 31, 2019, which is accounted for under the revenue recognition standard discussed in Note 2. Lessee Accounting The Company is the lessee under various corporate office and ground leases for which the Company recognized ROU assets and related lease liabilities effective January 1, 2019. The following table presents the Company’s ROU assets and related lease liabilities as of December 31, 2019 (amounts in thousands): 2019 Right-of-use assets: Corporate office leases $ 41,596 Ground leases (finance) 57,982 Ground leases (operating) 413,196 Right-of-use assets $ 512,774 Lease liabilities: Corporate office leases $ 43,105 Ground leases (finance) 23,239 Ground leases (operating) 264,990 Lease liabilities $ 331,334 As the standard requires the recognition of a liability for the lease obligation, discount rates are used to determine the net present value of the lease payments. The discount rate for the lease is the rate implicit in the lease or, if that rate cannot be readily determined, the incremental borrowing rate. As the Company does not know the amount of the lessors’ initial direct costs, it cannot readily determine the rate implicit in the lease and instead must apply the incremental borrowing rate. The Company has estimated the discount rate ranges of 3.3% to 3.9% for corporate office leases and 4.4% to 5.5% for ground leases at adoption. Since the Company’s credit backs the corporate office lease obligations and the lease terms are generally ten years or less, the discount rate range was estimated by using the Company’s borrowing rates for actual pricing data. The discount rate range for ground leases takes into account various factors, including the longer life of the ground leases, and was estimated by using the Company’s borrowing rates for actual pricing data through 30 years and other long-term market rates. Corporate office leases The Company leases nine corporate offices with lease expiration dates ranging from 2021 through 2042 (inclusive of applicable extension options). The Company’s corporate office leases continue to be accounted for as operating leases under the new standard. During the year ended December 31, 2019, the Company modified four office leases that continue to be classified as operating leases and recorded an additional lease liability and ROU asset at initial remeasurement of approximately $ 32.1 million . See Note 15 for details on a corporate office lease with a related party. Ground leases The Company maintains long-term ground leases for 14 operating properties and two projects under development with lease expiration dates ranging from 2042 through 2118 (inclusive of applicable purchase options). The Company owns the building and improvements. Based on its election of the package of practical expedients, the Company was not required to reassess the classification of existing ground leases at adoption and therefore the 14 operating property leases continue to be accounted for as operating leases. During the year ended December 31, 2019, the Company entered into two new ground leases, one of which is a fully prepaid ground lease, for projects under development that are being accounted for as finance leases and recorded initial ROU assets of approximately $57.9 million and lease liabilities of approximately $23.2 million. Ground Lease Intangibles Effective on January 1, 2019 with the adoption of the new leasing standard, ground lease intangibles, net of accumulated amortization were reclassed from other assets and other liabilities and are reported within the ROU assets on the consolidated balance sheets. See Note 2 for discussion of the opening balance of ROU assets. The following table summarizes the Company’s ground lease intangibles as of December 31, 2019 and 2018 (amounts in thousands): Description 2019 2018 Assets Ground lease intangibles $ 189,518 $ 191,918 Accumulated amortization (29,861 ) (25,688 ) Ground lease intangible assets, net (1) $ 159,657 $ 166,230 Liabilities Ground lease intangibles $ — $ 2,400 Accumulated amortization — (290 ) Ground lease intangible liabilities, net (1) $ — $ 2,110 (1 ) As of December 31, 2019, ground lease intangibles, net of accumulated amortization are included within the ROU assets on the consolidated balance sheets. As of December 31, 2018, the ground lease intangibles were included within other assets and other liabilities on the consolidated balance sheets. The following table provides a summary of the effect of the amortization for ground lease intangibles on the Company’s accompanying consolidated statements of operations and comprehensive income for the years ended December 31, 2019, 2018 and 2017 (amounts in thousands): Description Income Statement Location 2019 2018 2017 Ground lease intangible amortization Property and Maintenance $ (4,463 ) $ (4,463 ) $ (4,369 ) The following table provides a summary of the aggregate amortization for ground lease intangibles for each of the next five years (amounts in thousands): 2020 2021 2022 2023 2024 Ground lease intangibles $ (4,463 ) $ (4,463 ) $ (4,463 ) $ (4,463 ) $ (4,463 ) Additional disclosures The following tables illustrate the quantitative disclosures for lessees as of and for the year ended December 31, 2019 (amounts in thousands): Year Ended December 31, 2019 Lease cost: Finance lease cost: Amortization of right-of-use assets $ — Interest on lease liabilities (capitalized) 225 Operating lease cost: Corporate office leases 3,937 Ground leases 22,198 Variable lease cost: Corporate office leases 1,489 Ground leases 3,700 Total lease cost $ 31,549 December 31, 2019 Other information: Cash paid for amounts included in the measurement of lease liabilities: Investing cash flows from finance leases (capitalized) $ 34,922 Operating cash flows from operating leases: Corporate office leases $ 5,494 Ground leases $ 16,837 ROU assets obtained in exchange for new finance lease liabilities $ 23,201 ROU assets obtained in exchange for new operating lease liabilities: Corporate office leases $ 44,298 Ground leases $ 422,018 Weighted-average remaining lease term – finance leases (1) 19.7 years Weighted-average remaining lease term – operating leases: Corporate office leases 18.1 years Ground leases 56.2 years Weighted-average discount rate – finance leases 3.0 % Weighted-average discount rate – operating leases: Corporate office leases 3.2 % Ground leases 5.0 % (1 ) The weighted-average remaining lease term – finance leases does not include the remaining term of a fully prepaid finance lease entered into during the year ended December 31, 2019. The following table summarizes the Company’s undiscounted cash flows for contractual obligations for minimum rent payments/receipts under operating and financing leases for the next five years and thereafter as of December 31, 2019: (Payments)/Receipts Due by Year (in thousands) 2020 2021 2022 2023 2024 Thereafter Total Finance Leases: Minimum Rent Payments (a) $ (567 ) $ (578 ) $ (590 ) $ (601 ) $ (614 ) $ (33,850 ) $ (36,800 ) Operating Leases: Minimum Rent Payments (a) $ (16,914 ) $ (17,161 ) $ (16,907 ) $ (16,998 ) $ (17,330 ) $ (979,172 ) $ (1,064,482 ) Minimum Rent Receipts (b) $ 64,527 $ 61,817 $ 58,204 $ 50,906 $ 43,784 $ 154,898 $ 434,136 (a) Minimum basic rent due for corporate office leases and base rent due on ground leases where the Company is the lessee. (b) Minimum basic rent receipts due for various retail space where the Company is the lessor. Excludes residential leases due to their short-term nature. The following table provides a reconciliation of lease liabilities from our undiscounted cash flows for minimum rent payments as of December 31, 2019 (amounts in thousands): 2019 Total minimum rent payments $ 1,101,282 Less: Lease discount 769,948 Lease liabilities $ 331,334

Debt

Debt	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Debt	9 . Debt EQR does not have any indebtedness as all debt is incurred by the Operating Partnership. Weighted average interest rates noted below for the years ended December 31, 2019 and 2018 include the effect of any derivative instruments and amortization of premiums/discounts/OCI (other comprehensive income) on debt and derivatives. Mortgage Notes Payable The following tables summarize the Company’s mortgage notes payable activity for the years ended December 31, 2019 and 2018, respectively (amounts in thousands): Mortgage notes payable, net as of December 31, 2018 Proceeds Lump sum payoffs Scheduled principal repayments Amortization of premiums/ discounts Amortization of deferred financing costs, net (1) Mortgage notes payable, net as of December 31, 2019 Fixed Rate Debt: Secured – Conventional $ 1,885,407 $ 288,120 (2) $ (584,536 ) $ (6,308 ) $ (7,999 ) $ 15 $ 1,574,699 Floating Rate Debt: Secured – Conventional 6,357 7,651 (3) (5,920 ) (500 ) — (538 ) 7,050 Secured – Tax Exempt 493,706 — (152,565 ) — 16,617 2,103 359,861 Floating Rate Debt 500,063 7,651 (158,485 ) (500 ) 16,617 1,565 366,911 Total $ 2,385,470 $ 295,771 $ (743,021 ) $ (6,808 ) $ 8,618 $ 1,580 $ 1,941,610 (1 ) Represents amortization of deferred financing costs, net of debt financing costs. (2 ) Obtained 3.94% fixed rate mortgage debt held in a Fannie Mae loan pool maturing on March 1, 2029. (3 ) Obtained variable rate construction mortgage debt that is non-recourse to the Company maturing on June 25, 2022 (total commitment of $67.6 million). Mortgage notes payable, net as of December 31, 2017 Proceeds Lump sum payoffs Scheduled principal repayments Amortization of premiums/ discounts Amortization of deferred financing costs, net (1) Mortgage notes payable, net as of December 31, 2018 Fixed Rate Debt: Secured – Conventional $ 2,982,344 $ — $ (1,093,705 ) $ (6,029 ) $ 719 $ 2,078 $ 1,885,407 Floating Rate Debt: Secured – Conventional 6,948 — — (600 ) — 9 6,357 Secured – Tax Exempt 629,430 96,935 (2) (254,234 ) — 19,425 2,150 493,706 Floating Rate Debt 636,378 96,935 (254,234 ) (600 ) 19,425 2,159 500,063 Total $ 3,618,722 $ 96,935 $ (1,347,939 ) $ (6,629 ) $ 20,144 $ 4,237 $ 2,385,470 (1 ) Represents amortization of deferred financing costs, net of debt financing costs. (2 ) Reissued floating rate tax-exempt mortgage bonds which mature on April 1, 2042, remarket weekly and are guaranteed by ERPOP. The following table summarizes the Company’s debt extinguishment costs on mortgages recorded as additional interest expense during the years ended December 31, 2019 and 2018, respectively (amounts in thousands): Description 2019 2018 Prepayment premiums/penalties $ 3,381 $ 22,110 Write-offs of unamortized deferred financing costs 2,273 2,957 Write-offs of unamortized (premiums)/discounts/OCI 6,153 16,268 Total $ 11,807 $ 41,335 The following table summarizes certain interest rate and maturity date information as of and for the years ended December 31, 2019 and 2018 , respectively: December 31, 2019 December 31, 2018 Interest Rate Ranges 0.10% - 5.29% 0.10% - 6.90% Weighted Average Interest Rate 3.84% 4.15% Maturity Date Ranges 2020-2061 2019-2061 As of December 31, 2019 and 2018, the Company had $281.7 million and $440.7 million, respectively, of secured debt (primarily tax-exempt bonds) subject to third party credit enhancement. The historical cost, net of accumulated depreciation, of encumbered properties was $2.7 billion and $3.2 billion at December 31, 2019 and 2018, respectively. Notes The following tables summarize the Company’s notes activity for the years ended December 31, 2019 and 2018, respectively (amounts in thousands): Notes, net as of December 31, 2018 Proceeds Lump sum payoffs Realized/unrealized (gain) loss on derivative instruments Amortization of premiums/ discounts Amortization of deferred financing costs, net (1) Notes, net as of December 31, 2019 Fixed Rate Debt: Unsecured – Public $ 5,485,884 $ 1,194,468 (2) $ (600,000 ) $ — $ 3,117 $ (5,956 ) $ 6,077,513 Floating Rate Debt: Unsecured – Public 447,402 — (450,000 ) 2,277 45 276 — Total $ 5,933,286 $ 1,194,468 $ (1,050,000 ) $ 2,277 $ 3,162 $ (5,680 ) $ 6,077,513 (1) Represents amortization of deferred financing costs, net of debt financing costs. (2 ) Issued $600.0 million of ten-year 3.00% unsecured notes, receiving net proceeds of approximately $597.5 million before underwriting fees, hedge termination costs and other expenses. Additionally, issued $600.0 million of ten-year 2.50% unsecured notes, receiving net proceeds of approximately $597.0 million before underwriting fees and other expenses. Notes, net as of December 31, 2017 Proceeds Realized/unrealized (gain) loss on derivative instruments Amortization of premiums/ discounts Amortization of deferred financing costs, net (1) Notes, net as of December 31, 2018 Fixed Rate Debt: Unsecured – Public $ 4,591,373 $ 896,294 (2) $ — $ 2,547 $ (4,330 ) $ 5,485,884 Floating Rate Debt: Unsecured – Public (3) 447,439 — (680 ) 90 553 447,402 Total $ 5,038,812 $ 896,294 $ (680 ) $ 2,637 $ (3,777 ) $ 5,933,286 (1) Represents amortization of deferred financing costs, net of debt financing costs. (2 ) 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. Additionally, 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. (3 ) Fair value interest rate swaps converted the $450.0 million 2.375% notes due July 1, 2019 to a floating interest rate of 90-Day LIBOR plus 0.61%. The following table summarizes the Company’s debt extinguishment costs on notes recorded as additional interest expense during the years ended December 31, 2019 and 2018, respectively (amounts in thousands): Description 2019 2018 Prepayment premiums/penalties $ 10,266 $ — Write-offs of unamortized deferred financing costs 287 — Write-offs of unamortized (premiums)/discounts/OCI 1,043 — Total $ 11,596 $ — The following table summarizes certain interest rate and maturity date information as of and for the years ended December 31, 2019 and 2018, respectively: December 31, 2019 December 31, 2018 Interest Rate Ranges 2.50% - 7.57% 2.85% - 7.57% Weighted Average Interest Rate 4.21% 4.25% Maturity Date Ranges 2021-2047 2019-2047 The Company’s unsecured public notes contain 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, 2019 and 2018. 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 in June 2019 and expires in June 2022. Line of Credit and Commercial Paper On November 1, 2019, the Company replaced its existing $2.0 billion facility with a $2.5 billion unsecured revolving credit facility maturing November 1, 2024. The Company has the ability to increase available borrowings by an additional $750.0 million by adding lenders to the facility, obtaining the agreement of existing lenders to increase their commitments or incurring one or more term loans. The interest rate on advances under the facility will generally be LIBOR plus a spread (currently 0.775 %), or based on bids received from the lending group, and the Company pays a quarterly facility fee (currently ). Both the spread and the facility fee are dependent on the Company’s senior unsecured credit rating. The Company has an subject to market conditions The Company limits its utilization of the revolving credit facility in order to maintain liquidity to support its $1.0 billion commercial paper program ($500.0 million at December 31, 2018) along with certain other obligations. The following table presents the availability on the Company’s unsecured revolving credit facility as of December 31, 2019 and 2018 (amounts in thousands): December 31, 2019 December 31, 2018 Unsecured revolving credit facility commitment $ 2,500,000 $ 2,000,000 Commercial paper balance outstanding (1,000,000 ) (500,000 ) Unsecured revolving credit facility balance outstanding (20,000 ) — Other restricted amounts (100,929 ) (103,622 ) Unsecured revolving credit facility availability $ 1,379,071 $ 1,396,378 The following table summarizes the Company’s debt extinguishment costs on the line of credit recorded as additional interest expense during the years ended December 31, 2019 and 2018, respectively (amounts in thousands): Description 2019 2018 Write-offs of unamortized deferred financing costs $ 588 $ — Total $ 588 $ — Debt Maturity Table 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, 2019 (amounts in thousands): Year Total 2020 (1) $ 1,027,542 2021 926,404 2022 271,835 2023 1,329,088 2024 26,100 Thereafter 5,550,010 Subtotal 9,130,979 Deferred Financing Costs and Unamortized (Discount) (94,023 ) Total $ 9,036,956 (1) Includes $1.0 billion in principal outstanding on the Company’s commercial paper program.

Derivative and Other Fair Value

Derivative and Other Fair Value Instruments	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Derivative and Other Fair Value Instruments	10 . 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 may seek 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, 2019 and 2018 , respectively (amounts in thousands): December 31, 2019 December 31, 2018 Carrying Value Estimated Fair Value (Level 2) Carrying Value Estimated Fair Value (Level 2) Mortgage notes payable, net $ 1,941,610 $ 1,930,710 $ 2,385,470 $ 2,352,502 Unsecured debt, net 7,095,346 7,677,289 6,432,469 6,481,426 Total debt, net $ 9,036,956 $ 9,607,999 $ 8,817,939 $ 8,833,928 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, 2019 and 2018, respectively (amounts in thousands): Fair Value Measurements at Reporting Date Using Description Balance Sheet Location 12/31/2019 Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Supplemental Executive Retirement Plan Other Assets $ 151,889 $ 151,889 $ — $ — Liabilities Supplemental Executive Retirement Plan Other Liabilities $ 151,889 $ 151,889 $ — $ — Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Mezzanine $ 463,400 $ — $ 463,400 $ — 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 $ — 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, 2019, 2018 and 2017, respectively (amounts in thousands): December 31, 2019 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 $ 2,277 Fixed rate debt Interest expense $ (2,277 ) Total $ 2,277 $ (2,277 ) 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 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, 2019, 2018 and 2017, respectively (amounts in thousands): Effective Portion December 31, 2019 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 Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps $ (33,765 ) Interest expense $ (21,188 ) Total $ (33,765 ) $ (21,188 ) 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 ) N/A $ — 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 ) N/A $ — Total $ 6,439 $ (18,858 ) $ — As of December 31, 2019 and 2018, there were approximately $77.6 million and $65.0 million in deferred losses, net, included in accumulated other comprehensive income (loss), respectively, related to derivative instruments, of which an estimated $24.9 million may be recognized as additional interest expense during the twelve months ending December 31, 2020. In July 2019, six fair value interest rate swaps matured in conjunction with the maturity of $450.0 million of 2.375% unsecured notes. In June 2019, the Company paid approximately $41.8 million to settle ten forward starting swaps in conjunction with the issuance of $600.0 million of ten-year 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 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 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

Earnings Per Share and Earnings

Earnings Per Share and Earnings Per Unit	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share And Earnings Per Unit	1 1 . 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, 2019 2018 2017 Numerator for net income per share – basic: Net income $ 1,009,708 $ 685,192 $ 628,381 Allocation to Noncontrolling Interests – Operating Partnership (36,034 ) (24,939 ) (22,604 ) Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (3,297 ) (2,718 ) (2,323 ) Preferred distributions (3,090 ) (3,090 ) (3,091 ) Numerator for net income per share – basic $ 967,287 $ 654,445 $ 600,363 Numerator for net income per share – diluted: Net income $ 1,009,708 $ 685,192 $ 628,381 Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (3,297 ) (2,718 ) (2,323 ) Preferred distributions (3,090 ) (3,090 ) (3,091 ) Numerator for net income per share – diluted $ 1,003,321 $ 679,384 $ 622,967 Denominator for net income per share – basic and diluted: Denominator for net income per share – basic 370,461 368,052 366,968 Effect of dilutive securities: OP Units 12,907 12,869 12,901 Long-term compensation shares/units 2,965 2,774 2,809 Denominator for net income per share – diluted 386,333 383,695 382,678 Net income per share – basic $ 2.61 $ 1.78 $ 1.64 Net income per share – diluted $ 2.60 $ 1.77 $ 1.63 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, 2019 2018 2017 Numerator for net income per Unit – basic and diluted: Net income $ 1,009,708 $ 685,192 $ 628,381 Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (3,297 ) (2,718 ) (2,323 ) Allocation to Preference Units (3,090 ) (3,090 ) (3,091 ) Numerator for net income per Unit – basic and diluted $ 1,003,321 $ 679,384 $ 622,967 Denominator for net income per Unit – basic and diluted: Denominator for net income per Unit – basic 383,368 380,921 379,869 Effect of dilutive securities: Dilution for Units issuable upon assumed exercise/vesting of the Company’s long-term compensation shares/units 2,965 2,774 2,809 Denominator for net income per Unit – diluted 386,333 383,695 382,678 Net income per Unit – basic $ 2.61 $ 1.78 $ 1.64 Net income per Unit – diluted $ 2.60 $ 1.77 $ 1.63

Share Incentive Plans

Share Incentive Plans	12 Months Ended
	Dec. 31, 2019
Share Based Compensation [Abstract]
Share Incentive Plans	1 2 . 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. See Note 2 for additional information regarding the Company’s share-based compensation. Overview of Share Incentive Plans The 2019 Share Incentive Plan (the “2019 Plan”), as approved by the Company’s shareholders on June 27, 2019, expires on June 27, 2029 and reserves 11,331,958 Common Shares for issuance. All future awards will be granted under the 2019 Plan. As of December 31, 2019, 11,328,266 shares were available for future issuance. Pursuant to the 2019 Plan, the 2011 Share Incentive Plan (the “2011 Plan”) and the 2002 Share Incentive Plan (the “2002 Plan”), as restated and amended (collectively the “Share Incentive Plans”), officers, trustees, key employees and consultants of the Company and its subsidiaries 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. Options, SARs, restricted shares and restricted units are sometimes collectively referred to herein as “Awards”. The 2011 Plan and the 2002 Plan, as restated and amended, will both terminate when 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, absent immediate vesting and cash settlement. Any Options which had vested prior to such a termination would remain exercisable by the holder. Employee Long-Term Compensation Awards The following table summarizes the terms of Awards generally granted to employees: Options Restricted Shares Restricted Units Overview Options exercised after vesting result in issuance of new Common Shares. Restricted shareholders generally have the same voting rights and receive quarterly dividend payments on their shares at the same rate and on the same date as any other Common Share holder (1). When certain conditions are met, restricted units convert into an equal number of OP Units, which the holder may exchange for Common Shares on a one-for-one basis or at the option of the Company the cash value of such shares. Restricted unitholders receive quarterly distribution payments on their restricted units at the same rate and on the same date as any other OP Unit holder (1). Grant/Exercise Price Granted at the fair market value of Common Shares as of the grant date. Granted at the fair market value of Common Shares as of the grant date. Granted at varying discount rates to the fair market value of Common Shares as of the grant date (2). Vesting Period In three equal installments over a three-year period from the grant date. Three years from the grant date. Three years from the grant date. Expiration Ten years from the grant date. Not applicable. Ten years from the grant date (2). Upon Employee Termination Unvested options are canceled. Unvested restricted shares are canceled. Unvested restricted units are canceled. (1) Dividends/distributions paid on unvested restricted shares and units are included as a component of retained earnings and Noncontrolling Interest – Operating Partnership/Limited Partners Capital, respectively, 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. (2) A restricted unit will automatically convert to an OP Unit when the capital account of each restricted unit increases (“books-up”) to a specified target. The probability of a book-up occurring within the ten-year contractual life along with the liquidity risk associated with various hold period restrictions are both reflected in the discount. If the capital target is not attained within ten years following the date of issuance, the restricted unit will automatically be canceled and no compensation will be payable to the holder of such canceled restricted unit. If the capital target is attained and the restricted unit is converted to an OP Unit, it will not expire. Long Term Incentive Plan The Company’s executive compensation program allows the Chairman, Chief Executive Officer and certain other Executive Officers 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. The Company’s Total Shareholder Return (“TSR”) and Normalized Funds from Operations (“FFO”) results over a forward-looking three-year performance period determine the restricted shares and/or restricted units awarded and are compared to pre-established quantitative performance metrics. 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 over the service period regardless of whether the TSR performance measures are achieved and the Normalized FFO portion of the awards is adjusted based on the final achievement obtained. 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 and vesting period. The LTI participants receive distributions on only restricted units awarded equal to 10% of the quarterly distributions paid on OP Units during the performance period. At the end of the performance period, LTI participants receive dividends/distributions actually earned on restricted shares or restricted units awarded during the performance period, less any distributions already paid on the restricted units. No payout would be made for any return below 50% of the target performance metric. Trustees All Trustees, with the exception of the Company’s 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 Chairman has only received awards under the LTI plan (see further discussion above). Retirement Benefits The Company’s Share Incentive Plans provide for certain benefits upon retirement. The following table summarizes the terms of each retirement eligibility category. Age 62 for Employees Rule of 70 for Employees Age 72 for Trustees Eligibility For employees hired prior to January 1, 2009 and who were age 59 or older as of February 1, 2019. All employees (1). All non-employee Trustees. Effect on unvested restricted shares, restricted units and Options Awards immediately vest and Options continue to be exercisable for the balance of the applicable ten-year option period. Awards continue to vest per the original vesting schedule, subject to certain conditions, and Options continue to be exercisable for the balance of the applicable ten-year option period. Awards immediately vest and Options continue to be exercisable for the balance of the applicable ten-year option period. Effect on LTI Plan Awards are prorated in proportion to the number of days worked in the first year of the three-year performance period and the individual does not receive any payout of shares or units until the final payout is determined at the end of the three-year performance period. (1) 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 six months’ advance written notice of his or her intention to retire along with agreeing to certain other conditions. Under the Company’s definitions of retirement, some of its executive officers and its Chairman are retirement eligible. Compensation Expense and Award Activity The following tables summarize compensation information regarding the restricted shares, restricted units, Options and Employee Share Purchase Plan (“ESPP”) for the three Year Ended December 31, 2019 Compensation Expense Compensation Capitalized Restricted Units/Options In-Lieu of Bonus (1) Compensation Equity Dividends Incurred Restricted shares (2) $ 11,522 $ 916 $ — $ 12,438 $ 979 Restricted units (2) 9,905 240 3,265 13,410 825 Options 2,420 254 1 2,675 — ESPP discount 602 40 — 642 — Total $ 24,449 $ 1,450 $ 3,266 $ 29,165 $ 1,804 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 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 Options 4,893 323 1,619 6,835 — ESPP discount 681 66 — 747 — Total $ 24,997 $ 1,076 $ 1,809 $ 27,882 $ 1,502 (1) The Company allows eligible officers the ability to receive immediately vested restricted units (subject to the book-up provisions described above and a two-year hold restriction) or immediately vested 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 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, 2019 is $8.9 million (including 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 1.35 years. The tables below summarize the Award activity of the Share Incentive Plans for the three years ended December 31, 2019, 2018 and 2017 : 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, 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 Awards granted (1) (5) 234,147 $ 72.10 163,799 $ 73.96 141,772 $ 67.22 Awards exercised/vested (2) (3) (4) (1,745,050 ) $ 44.72 (151,321 ) $ 75.41 (422,784 ) $ 70.77 Awards forfeited (30,489 ) $ 61.92 (5,197 ) $ 65.35 (552 ) $ 69.43 Awards expired (3,299 ) $ 40.39 — — — — Balance at December 31, 2019 5,567,544 $ 55.52 306,706 $ 66.15 858,284 $ 64.95 (1) The weighted average grant date fair value for Options granted during the years ended December 31, 2019, 2018 and 2017 was $8.05 per share, $6.17 per share and $5.86 per share, respectively. (2) The aggregate intrinsic value of Options exercised during the years ended December 31, 2019, 2018 and 2017 was $58.1 million, $42.9 million and $25.6 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, 2019, 2018 and 2017 was $11.1 million, $11.5 million and $10.2 million, respectively. (4) The fair value of restricted units vested during the years ended December 31, 2019, 2018 and 2017 was $29.1 million, $1.8 million and $11.7 million, respectively. (5) Includes LTI plan awards granted under the executive compensation program. The following table summarizes information regarding Options outstanding and exercisable at December 31, 2019 (aggregate intrinsic value is in thousands): Options Weighted Average Remaining Contractual Life in Years Weighted Average Exercise Price Aggregate Intrinsic Value (1) Options Outstanding 5,567,544 5.30 $ 55.52 $ 141,395 Options Exercisable 4,750,481 4.81 $ 54.13 $ 127,277 Vested and expected to vest 808,646 8.13 $ 63.60 $ 14,005 (1) The aggregate intrinsic values were calculated as the excess, if any, between the Company’s closing share price of $80.92 per share on December 31, 2019 and the strike price of the underlying awards. As of December 31, 2018 and 2017, 5,328,020 Options (with a weighted average exercise price of $49.57) and 5,336,043 Options (with a weighted average exercise price of $43.24) were exercisable, respectively.

Employee Plans

Employee Plans	12 Months Ended
	Dec. 31, 2019
Employee Service Share Based Compensation Aggregate Disclosures [Abstract]
Employee Plans	1 3 . 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 2,714,332 Common Shares remained available for purchase at December 31, 2019. 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 with the net proceeds noted below being contributed to ERPOP in exchange for OP Units (amounts in thousands except share and per share amounts): Year Ended December 31, 2019 2018 2017 Shares issued 48,131 75,414 68,286 Issuance price ranges $59.56 – $72.91 $47.80 – $57.09 $52.79 – $58.06 Issuance proceeds $3,116 $3,879 $3,744 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 $5.0 million, $4.9 million and $4.6 million for the years ended December 31, 2019, 2018 and 2017, 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, 2019
Distribution Reinvestment And Share Purchase Plan [Abstract]
Distribution Reinvestment Plan	1 4 . 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 4,664,977 Common Shares available for issuance under the 2014 DRIP at December 31, 2019. 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, 2019
Related Party Transactions [Abstract]
Transactions with Related Parties	1 5 . Transactions with Related Parties The Company leases its corporate headquarters from an entity affiliated with EQR’s Chairman of the Board of Trustees. The lease term expires on November 30, 2032 and contains two five-year extension options. The amount incurred for such office space for the years ended December 31, 2019, 2018 and 2017 were approximately $2.6 million, $2.5 million and $2.8 million, respectively. The Company believes these amounts approximate market rates for such rental space.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	1 6 . 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. 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, 2019, the Company has two wholly owned projects and one partially owned project totaling 824 apartment units in various stages of development with remaining commitments to fund of approximately $421.2 million (inclusive of applicable construction mortgage and joint venture partner obligations) 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, 2019, the Company has two joint venture agreements with third party partners for the consolidated development of multifamily rental properties. The development commitment to fund the project under construction is included in the development funding totals above for one of the joint ventures. The joint venture agreements with each partner include a buy-sell provision that provides the right, but not the obligation, for the Company to acquire each respective partner’s interests or sell its interests at any time following the occurrence of certain pre-defined events described in the joint venture agreements. See Note 6 for additional discussion. The Company has entered into a retirement benefits agreement with its Chairman and deferred compensation agreements with other former executive officers. During the years ended December 31, 2019, 2018 and 2017, the Company recognized compensation expense of $0.4 million, $0.3 million and $0.4 million, respectively, related to these agreements. The following table summarizes the Company’s contractual obligations for deferred compensation for the next five years and thereafter as of December 31, 2019: (Payments)/Receipts Due by Year (in thousands) 2020 2021 2022 2023 2024 Thereafter Total Other Long-Term Liabilities: Deferred Compensation (1) $ (761 ) $ (1,116 ) $ (1,116 ) $ (991 ) $ (709 ) $ (3,897 ) $ (8,590 ) (1) Estimated payments to the Company’s Chairman and one former executive officer based on actual and estimated retirement dates.

Reportable Segments

Reportable Segments	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Reportable Segments	1 7 . 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 communities represent its reportable segments (the recently acquired Denver properties owned by the Company were included in non–same store through 2019). 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, 2019, 2018 and 2017, respectively. 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 for the years ended December 31, 2019, 2018 and 2017, respectively (amounts in thousands): Year Ended December 31, 2019 2018 2017 Rental income $ 2,700,691 $ 2,577,681 $ 2,470,689 Property and maintenance expense (446,845 ) (429,335 ) (405,281 ) Real estate taxes and insurance expense (366,139 ) (357,814 ) (335,495 ) Total operating expenses (812,984 ) (787,149 ) (740,776 ) Net operating income $ 1,887,707 $ 1,790,532 $ 1,729,913 The following tables present NOI for each segment from our rental real estate for the years ended December 31, 2019, 2018 and 2017 , respectively, as well as total assets and capital expenditures at December 31, 2019 and 2018 , respectively (amounts in thousands): Year Ended December 31, 2019 Year Ended December 31, 2018 Year Ended December 31, 2017 Rental Income Operating Expenses NOI Rental Income Operating Expenses NOI Rental Income Operating Expenses NOI Same store (1) Los Angeles $ 468,517 $ 136,096 $ 332,421 $ 451,592 $ 129,455 $ 322,137 $ 402,192 $ 114,055 $ 288,137 Orange County 105,087 24,407 80,680 101,198 24,468 76,730 88,527 21,544 66,983 San Diego 95,042 24,636 70,406 91,971 24,024 67,947 88,507 23,073 65,434 Subtotal - Southern California 668,646 185,139 483,507 644,761 177,947 466,814 579,226 158,672 420,554 San Francisco 480,499 116,036 364,463 463,492 112,331 351,161 430,501 108,689 321,812 Washington D.C. 413,006 125,688 287,318 403,761 123,345 280,416 430,060 129,720 300,340 New York 454,448 188,784 265,664 444,112 178,055 266,057 454,945 170,064 284,881 Boston 227,547 62,176 165,371 218,778 60,409 158,369 223,595 60,931 162,664 Seattle 207,019 56,016 151,003 200,222 55,871 144,351 191,074 52,470 138,604 Other Markets 2,094 714 1,380 1,940 658 1,282 1,839 652 1,187 Total same store 2,453,259 734,553 1,718,706 2,377,066 708,616 1,668,450 2,311,240 681,198 1,630,042 Non-same store/other (2) (3) Non-same store 196,476 62,591 133,885 103,688 36,874 66,814 95,016 30,742 64,274 Other (3) 50,956 15,840 35,116 96,927 41,659 55,268 64,433 28,836 35,597 Total non-same store/other 247,432 78,431 169,001 200,615 78,533 122,082 159,449 59,578 99,871 Totals $ 2,700,691 $ 812,984 $ 1,887,707 $ 2,577,681 $ 787,149 $ 1,790,532 $ 2,470,689 $ 740,776 $ 1,729,913 (1) For the years ended December 31, 2019 and 2018, same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2018, less properties subsequently sold, which represented 71,830 apartment units. For the year ended December 31, 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. (2) For the years ended December 31, 2019 and 2018, non-same store primarily includes properties acquired after January 1, 2018, plus any properties in lease-up and not stabilized as of January 1, 2018. For the year ended December 31, 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. (3) Other includes development, other corporate operations and operations prior to disposition for properties sold. Year Ended December 31, 2019 Year Ended December 31, 2018 Total Assets Capital Expenditures Total Assets Capital Expenditures Same store (1) Los Angeles $ 2,975,420 $ 31,738 $ 2,958,361 $ 28,574 Orange County 404,545 9,276 418,041 8,214 San Diego 389,537 4,464 405,449 4,525 Subtotal - Southern California 3,769,502 45,478 3,781,851 41,313 San Francisco 3,238,884 28,153 3,325,595 42,497 Washington D.C. 3,370,750 23,015 3,484,045 26,981 New York 3,866,500 25,132 3,878,580 23,126 Boston 1,464,196 23,823 1,514,814 24,000 Seattle 1,292,609 19,990 1,330,959 18,065 Other Markets 12,931 194 12,781 163 Total same store 17,015,372 165,785 17,328,625 176,145 Non-same store/other (2) (3) Non-same store 3,447,497 10,788 1,990,102 5,934 Other (3) 709,900 1,850 1,075,482 6,422 Total non-same store/other 4,157,397 12,638 3,065,584 12,356 Totals $ 21,172,769 $ 178,423 $ 20,394,209 $ 188,501 (1) Same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2018, less properties subsequently sold, which represented 71,830 apartment units. (2) Non-same store primarily includes properties acquired after January 1, 2018, plus any properties in lease-up and not stabilized as of January 1, 2018. (3) Other includes development, other corporate operations and capital expenditures for properties sold.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	1 8 . Subsequent Events Subsequent to December 31, 2019, the Company: • Sold one partially owned property consisting of 136 apartment units for $31.2 million.

Quarterly Financial Data (Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2019
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 2019 (1) 3/31 6/30 9/30 12/31 Total revenues $ 662,494 $ 669,517 $ 685,145 $ 683,919 Operating income 209,969 369,260 368,363 408,952 Net income * 109,257 321,299 277,846 301,306 Net income available to Common Shares 103,766 308,196 266,333 288,992 Earnings per share: Net income available to Common Shares - basic $ 0.28 $ 0.83 $ 0.72 $ 0.78 Net income available to Common Shares - diluted $ 0.28 $ 0.83 $ 0.71 $ 0.77 First Quarter Second Quarter Third Quarter Fourth Quarter 2018 (1) 3/31 6/30 9/30 12/31 Total revenues $ 633,016 $ 639,808 $ 652,867 $ 652,743 Operating income 339,082 217,603 339,403 219,282 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: Net income available to Common Shares - basic $ 0.57 $ 0.31 $ 0.58 $ 0.32 Net income available to Common Shares - diluted $ 0.57 $ 0.31 $ 0.58 $ 0.31 * The Company did not have any discontinued operations, extraordinary items or cumulative effect of change in accounting principle during the periods presented. 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. (1) Amounts may not equal full year results due to rounding. 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 2019 (1) 3/31 6/30 9/30 12/31 Total revenues $ 662,494 $ 669,517 $ 685,145 $ 683,919 Operating income 209,969 369,260 368,363 408,952 Net income * 109,257 321,299 277,846 301,306 Net income available to Units 107,685 319,706 276,243 299,687 Earnings per Unit: Net income available to Units - basic $ 0.28 $ 0.83 $ 0.72 $ 0.78 Net income available to Units - diluted $ 0.28 $ 0.83 $ 0.71 $ 0.77 First Quarter Second Quarter Third Quarter Fourth Quarter 2018 (1) 3/31 6/30 9/30 12/31 Total revenues $ 633,016 $ 639,808 $ 652,867 $ 652,743 Operating income 339,082 217,603 339,403 219,282 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: Net income available to Units - basic $ 0.57 $ 0.31 $ 0.58 $ 0.32 Net income available to Units - diluted $ 0.57 $ 0.31 $ 0.58 $ 0.31 * The Operating Partnership did not have any discontinued operations, extraordinary items or cumulative effect of change in accounting principle during the periods presented. 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. (1) Amounts may not equal full year results due to rounding.

Schedule III - Real Estate and

Schedule III - Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2019
Real Estate And Accumulated Depreciation Disclosure [Abstract]
Schedule III-Real Estate and Accumulated Depreciation	EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation Overall Summary December 31, 2019 Properties Apartment Units Investment in Real Estate, Gross Accumulated Depreciation Investment in Real Estate, Net Encumbrances (1) Wholly Owned Unencumbered 257 68,002 $ 23,408,268,350 $ (6,199,955,243 ) $ 17,208,313,107 $ — Wholly Owned Encumbered 35 8,425 3,204,805,398 (792,348,079 ) 2,412,457,319 1,630,731,451 Wholly Owned Properties 292 76,427 26,613,073,748 (6,992,303,322 ) 19,620,770,426 1,630,731,451 Partially Owned Unencumbered 9 1,847 524,897,809 (133,111,488 ) 391,786,321 — Partially Owned Encumbered 8 1,688 395,635,869 (151,371,564 ) 244,264,305 310,878,101 Partially Owned Properties 17 3,535 920,533,678 (284,483,052 ) 636,050,626 310,878,101 Total Unencumbered Properties 266 69,849 23,933,166,159 (6,333,066,731 ) 17,600,099,428 — Total Encumbered Properties 43 10,113 3,600,441,267 (943,719,643 ) 2,656,721,624 1,941,609,552 Total Consolidated Investment in Real Estate 309 79,962 $ 27,533,607,426 $ (7,276,786,374 ) $ 20,256,821,052 $ 1,941,609,552 (1) See attached Encumbrances Reconciliation. EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation Encumbrances Reconciliation December 31, 2019 Portfolio/Entity Encumbrances Number of Properties Encumbered by See Properties With Note: Amount Archstone Master Property Holdings LLC 13 H $ 798,230,171 Portfolio/Entity Encumbrances 13 798,230,171 Individual Property Encumbrances 1,143,379,381 Total Encumbrances per Financial Statements $ 1,941,609,552 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, 2019, 2018 and 2017 are as follows: 2019 2018 2017 Balance, beginning of year $ 26,511,022 $ 26,026,896 $ 25,386,425 Acquisitions and development 1,704,320 855,254 710,960 Improvements 180,944 192,661 204,113 Dispositions and other (862,679 ) (563,789 ) (274,602 ) Balance, end of year $ 27,533,607 $ 26,511,022 $ 26,026,896 The changes in accumulated depreciation for the years ended December 31, 2019, 2018 and 2017 are as follows: 2019 2018 2017 Balance, beginning of year $ 6,696,281 $ 6,040,378 $ 5,360,389 Depreciation 831,083 785,725 743,749 Dispositions and other (250,578 ) (129,822 ) (63,760 ) Balance, end of year $ 7,276,786 $ 6,696,281 $ 6,040,378 EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation December 31, 2019 Description Initial Cost to Company Cost Capitalized Subsequent to Acquisition (Improvements, net) (E) Gross Amount Carried at Close of Period 12/31/19 Apartment Name Location Retail/ Commercial Space Date of Construction Apartment Units Land Building & Fixtures Building & Fixtures Land Building & Fixtures (A) Total (B) Accumulated Depreciation (C) Investment in Real Estate, Net at 12/31/19 Encumbrances Wholly Owned Unencumbered: 100 K Apartments (fka 100K Street) Washington, D.C. — 2018 222 $ 15,600,000 $ 69,662,369 $ 2,484 $ 15,600,000 $ 69,664,853 $ 85,264,853 $ (3,157,965 ) $ 82,106,888 $ — 140 Riverside Boulevard New York, NY G 2003 354 103,539,100 94,082,725 10,160,746 103,539,100 104,243,471 207,782,571 (52,510,393 ) 155,272,178 — 160 Riverside Boulevard New York, NY G 2001 455 139,933,500 190,964,745 17,198,947 139,933,500 208,163,692 348,097,192 (104,423,480 ) 243,673,712 — 170 Amsterdam New York, NY G 2015 236 — 112,096,955 439,194 — 112,536,149 112,536,149 (20,556,743 ) 91,979,406 — 175 Kent Brooklyn, NY G 2011 113 22,037,831 53,962,169 2,003,647 22,037,831 55,965,816 78,003,647 (18,206,594 ) 59,797,053 — 180 Montague (fka Brooklyn Heights) Brooklyn, NY G 2000 193 32,400,000 92,675,228 4,764,589 32,400,000 97,439,817 129,839,817 (27,077,371 ) 102,762,446 — 180 Riverside Boulevard New York, NY G 1998 516 144,968,250 138,346,681 14,692,592 144,968,250 153,039,273 298,007,523 (78,364,843 ) 219,642,680 — 1111 Belle Pre (fka The Madison) Alexandria, VA G 2014 360 18,937,702 94,758,679 399,141 18,937,702 95,157,820 114,095,522 (25,780,466 ) 88,315,056 — 1210 Mass Washington, D.C. G 2004 144 9,213,512 36,559,189 2,770,003 9,213,512 39,329,192 48,542,704 (20,032,298 ) 28,510,406 — 1401 Joyce on Pentagon Row Arlington, VA — 2004 326 9,780,000 89,668,165 5,482,703 9,780,000 95,150,868 104,930,868 (38,110,856 ) 66,820,012 — 1500 Mass Ave Washington, D.C. G 1951 556 54,638,298 40,361,702 15,851,496 54,638,298 56,213,198 110,851,496 (29,241,959 ) 81,609,537 — 1800 Oak (fka Rosslyn) Arlington, VA G 2003 314 31,400,000 109,005,734 7,759,305 31,400,000 116,765,039 148,165,039 (32,605,736 ) 115,559,303 — 2201 Pershing Drive Arlington, VA G 2012 188 11,321,198 49,674,175 2,653,163 11,321,198 52,327,338 63,648,536 (15,332,930 ) 48,315,606 — 2201 Wilson Arlington, VA G 2000 219 21,900,000 78,724,663 4,621,475 21,900,000 83,346,138 105,246,138 (23,254,386 ) 81,991,752 — 2400 M St Washington, D.C. G 2006 359 30,006,593 114,013,785 4,706,151 30,006,593 118,719,936 148,726,529 (57,645,397 ) 91,081,132 — 315 on A Boston, MA G 2013 202 14,450,070 115,824,930 1,261,179 14,450,070 117,086,109 131,536,179 (22,891,380 ) 108,644,799 — 340 Fremont (fka Rincon Hill) San Francisco, CA — 2016 348 42,000,000 248,609,655 179,247 42,000,000 248,788,902 290,788,902 (33,388,938 ) 257,399,964 — 341 Nevins Brooklyn, NY — (F) — 3,621,830 189,222 — 3,621,830 189,222 3,811,052 — 3,811,052 — 3003 Van Ness (fka Van Ness) Washington, D.C. — 1970 625 56,300,000 141,191,580 7,157,154 56,300,000 148,348,734 204,648,734 (43,856,738 ) 160,791,996 — 425 Mass Washington, D.C. G 2009 559 28,150,000 138,600,000 4,759,357 28,150,000 143,359,357 171,509,357 (53,491,733 ) 118,017,624 — 455 Eye Street Washington, D.C. G 2017 174 11,941,407 61,418,274 40,682 11,941,407 61,458,956 73,400,363 (6,002,916 ) 67,397,447 — 4701 Willard Chevy Chase, MD G 1966 517 76,921,130 153,947,682 31,235,663 76,921,130 185,183,345 262,104,475 (67,153,478 ) 194,950,997 — 4885 Edgemoor Lane Bethesda, MD — (F) — — 10,864,626 — — 10,864,626 10,864,626 — 10,864,626 — 4th and Hill Los Angeles, CA — (F) — 13,131,456 16,680,349 — 13,131,456 16,680,349 29,811,805 — 29,811,805 — 600 Washington New York, NY G 2004 135 32,852,000 43,140,551 1,548,076 32,852,000 44,688,627 77,540,627 (22,331,625 ) 55,209,002 — 660 Washington (fka Boston Common) Boston, MA G 2006 420 106,100,000 166,311,679 4,730,410 106,100,000 171,042,089 277,142,089 (46,949,010 ) 230,193,079 — 70 Greene Jersey City, NJ G 2010 480 28,108,899 236,763,553 2,932,277 28,108,899 239,695,830 267,804,729 (81,879,133 ) 185,925,596 — 71 Broadway New York, NY G 1997 238 22,611,600 77,492,171 17,054,425 22,611,600 94,546,596 117,158,196 (51,104,697 ) 66,053,499 — 77 Bluxome San Francisco, CA — 2007 102 5,249,124 18,609,876 479,898 5,249,124 19,089,774 24,338,898 (6,408,288 ) 17,930,610 — 77 Park Avenue (fka Hoboken) Hoboken, NJ G 2000 301 27,900,000 168,992,440 7,688,560 27,900,000 176,681,000 204,581,000 (47,768,422 ) 156,812,578 — 777 Sixth New York, NY G 2002 294 65,352,706 65,747,294 4,999,856 65,352,706 70,747,150 136,099,856 (30,672,075 ) 105,427,781 — 88 Hillside Daly City, CA G 2011 95 7,786,800 31,587,325 3,225,899 7,786,800 34,813,224 42,600,024 (11,434,181 ) 31,165,843 — 855 Brannan San Francisco, CA G 2018 449 41,363,921 282,107,685 62,476 41,363,921 282,170,161 323,534,082 (23,429,467 ) 300,104,615 — 929 Mass (fka 929 House) Cambridge, MA G 1975 127 3,252,993 21,745,595 7,695,575 3,252,993 29,441,170 32,694,163 (19,893,418 ) 12,800,745 — Academy Village North Hollywood, CA — 1989 248 25,000,000 23,593,194 9,821,339 25,000,000 33,414,533 58,414,533 (20,345,297 ) 38,069,236 — Acappella Pasadena, CA — 2002 143 5,839,548 29,360,452 2,301,628 5,839,548 31,662,080 37,501,628 (12,293,107 ) 25,208,521 — Acton Courtyard Berkeley, CA G 2003 71 5,550,000 15,785,509 396,492 5,550,000 16,182,001 21,732,001 (7,612,133 ) 14,119,868 — Alban Towers Washington, D.C. — 1934 229 18,900,000 89,794,201 6,474,195 18,900,000 96,268,396 115,168,396 (25,786,581 ) 89,381,815 — Alborada Fremont, CA — 1999 442 24,310,000 59,214,129 9,528,299 24,310,000 68,742,428 93,052,428 (44,468,172 ) 48,584,256 — Alcott Apartments (fka West End Tower) Boston, MA G (F) — 10,424,000 128,885,729 — 10,424,000 128,885,729 139,309,729 — 139,309,729 — Altitude (fka Village at Howard Hughes, The (Lots 1 & 2)) Los Angeles, CA — 2016 545 43,783,485 150,235,905 493,024 43,783,485 150,728,929 194,512,414 (20,615,169 ) 173,897,245 — Alton, The (fka Millikan) Irvine, CA — 2017 344 11,049,027 96,526,323 150,438 11,049,027 96,676,761 107,725,788 (11,346,591 ) 96,379,197 — Arbor Terrace Sunnyvale, CA — 1979 175 9,057,300 18,483,642 11,357,865 9,057,300 29,841,507 38,898,807 (17,937,496 ) 20,961,311 — Arches, The Sunnyvale, CA — 1974 410 26,650,000 62,850,000 2,623,168 26,650,000 65,473,168 92,123,168 (24,870,049 ) 67,253,119 — EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation December 31, 2019 Description Initial Cost to Company Cost Capitalized Subsequent to Acquisition (Improvements, net) (E) Gross Amount Carried at Close of Period 12/31/19 Apartment Name Location Retail/ Commercial Space Date of Construction Apartment Units Land Building & Fixtures Building & Fixtures Land Building & Fixtures (A) Total (B) Accumulated Depreciation (C) Investment in Real Estate, Net at 12/31/19 Encumbrances Artisan on Second Los Angeles, CA — 2008 118 8,000,400 36,074,600 1,173,462 8,000,400 37,248,062 45,248,462 (12,924,017 ) 32,324,445 — Artisan Square Northridge, CA — 2002 140 7,000,000 20,537,359 1,889,100 7,000,000 22,426,459 29,426,459 (13,116,756 ) 16,309,703 — Artistry Emeryville (fka Emeryville) Emeryville, CA — 1994 267 12,300,000 61,466,267 7,189,056 12,300,000 68,655,323 80,955,323 (20,908,096 ) 60,047,227 — Atelier Brooklyn, NY G 2015 120 32,401,680 47,135,432 432,778 32,401,680 47,568,210 79,969,890 (8,426,826 ) 71,543,064 — Avenue Two Redwood City, CA — 1972 123 7,995,000 18,005,000 2,417,128 7,995,000 20,422,128 28,417,128 (7,587,499 ) 20,829,629 — Axis at Shady Grove Rockville, MD — 2016 366 14,745,774 90,503,831 123,658 14,745,774 90,627,489 105,373,263 (6,627,790 ) 98,745,473 — Azure (fka Mission Bay-Block 13) San Francisco, CA — 2015 273 32,855,115 153,569,655 385,653 32,855,115 153,955,308 186,810,423 (25,110,173 ) 161,700,250 — Bay Hill Long Beach, CA — 2002 160 7,600,000 27,437,239 3,648,128 7,600,000 31,085,367 38,685,367 (16,705,166 ) 21,980,201 — Beatrice, The New York, NY — 2010 302 114,351,405 165,648,595 1,852,511 114,351,405 167,501,106 281,852,511 (51,586,536 ) 230,265,975 — Bella Vista I, II, III Combined Woodland Hills, CA — 2003-2007 579 31,682,754 121,095,786 10,564,320 31,682,754 131,660,106 163,342,860 (63,397,900 ) 99,944,960 — Belle Arts Condominium Homes, LLC Bellevue, WA — 2000 1 63,158 236,157 2,098 63,158 238,255 301,413 (91,640 ) 209,773 — Belle Fontaine Marina Del Rey, CA — 2003 102 9,098,808 28,701,192 2,077,210 9,098,808 30,778,402 39,877,210 (9,929,838 ) 29,947,372 — Breakwater at Marina Del Rey Marina Del Rey, CA — 1964-1969 224 — 73,189,262 2,301,977 — 75,491,239 75,491,239 (22,556,033 ) 52,935,206 — Briarwood (CA) Sunnyvale, CA — 1985 192 9,991,500 22,247,278 4,223,652 9,991,500 26,470,930 36,462,430 (19,003,418 ) 17,459,012 — Brodie, The Westminster, CO — 2016 312 8,639,904 79,254,009 338,241 8,639,904 79,592,250 88,232,154 (4,390,121 ) 83,842,033 — Brooklyner, The (fka 111 Lawrence) Brooklyn, NY G 2010 490 40,099,922 221,438,631 4,272,230 40,099,922 225,710,861 265,810,783 (69,755,616 ) 196,055,167 — C on Pico Los Angeles, CA — 2014 94 17,125,766 28,074,234 468,094 17,125,766 28,542,328 45,668,094 (4,917,365 ) 40,750,729 — Carlyle Mill Alexandria, VA — 2002 317 10,000,000 51,367,913 9,043,657 10,000,000 60,411,570 70,411,570 (34,997,308 ) 35,414,262 — Carmel Terrace San Diego, CA — 1988-1989 384 2,288,300 20,596,281 12,519,325 2,288,300 33,115,606 35,403,906 (28,576,803 ) 6,827,103 — Cascade Seattle, WA G 2017 477 23,751,564 149,388,658 10,060 23,751,564 149,398,718 173,150,282 (14,329,011 ) 158,821,271 — Centennial (fka Centennial Court & Centennial Tower) Seattle, WA G 1991/2001 408 9,700,000 70,080,378 13,065,205 9,700,000 83,145,583 92,845,583 (43,852,523 ) 48,993,060 — Centre Club Combined Ontario, CA — 1994 & 2002 412 7,436,000 33,014,789 9,490,814 7,436,000 42,505,603 49,941,603 (26,716,928 ) 23,224,675 — Chloe on Madison (fka 1401 E. Madison) Seattle, WA G 2019 137 10,401,958 52,593,395 — 10,401,958 52,593,395 62,995,353 (497,660 ) 62,497,693 — Chloe on Union (fka Chloe) Seattle, WA G 2010 117 14,835,571 39,359,650 2,516,557 14,835,571 41,876,207 56,711,778 (4,541,342 ) 52,170,436 — Church Corner Cambridge, MA G 1987 85 5,220,000 16,744,643 3,270,549 5,220,000 20,015,192 25,235,192 (10,988,447 ) 14,246,745 — City Gate at Cupertino (fka Cupertino) Cupertino, CA — 1998 311 40,400,000 95,937,046 7,548,015 40,400,000 103,485,061 143,885,061 (29,361,079 ) 114,523,982 — City Pointe Fullerton, CA G 2004 183 6,863,792 36,476,208 3,588,233 6,863,792 40,064,441 46,928,233 (15,519,206 ) 31,409,027 — City Square Bellevue (fka Bellevue) Bellevue, WA G 1998 191 15,100,000 41,876,257 3,873,050 15,100,000 45,749,307 60,849,307 (13,419,667 ) 47,429,640 — Clarendon, The Arlington, VA G 2005 292 30,400,340 103,824,660 2,674,009 30,400,340 106,498,669 136,899,009 (36,985,746 ) 99,913,263 — Cleo, The Los Angeles, CA — 1989 92 6,615,467 14,829,335 4,079,934 6,615,467 18,909,269 25,524,736 (9,776,697 ) 15,748,039 — Connecticut Heights Washington, D.C. — 1974 518 27,600,000 114,002,295 10,060,643 27,600,000 124,062,938 151,662,938 (33,971,504 ) 117,691,434 — Corcoran House at DuPont Circle (fka DuPont Circle) Washington, D.C. G 1961 138 13,500,000 26,913,113 2,637,933 13,500,000 29,551,046 43,051,046 (9,012,285 ) 34,038,761 — Courthouse Plaza Arlington, VA G 1990 396 — 87,386,024 6,316,702 — 93,702,726 93,702,726 (28,408,921 ) 65,293,805 — Creekside (San Mateo) San Mateo, CA — 1985 192 9,606,600 21,193,232 4,951,801 9,606,600 26,145,033 35,751,633 (18,907,735 ) 16,843,898 — Cronins Landing Waltham, MA G 1998 281 32,300,000 85,119,324 11,972,290 32,300,000 97,091,614 129,391,614 (27,201,943 ) 102,189,671 — Crystal Place Arlington, VA — 1986 181 17,200,000 47,918,975 3,946,812 17,200,000 51,865,787 69,065,787 (15,614,718 ) 53,451,069 — Dalton, The Alexandria, VA G 2018 270 22,947,777 95,292,515 (6 ) 22,947,777 95,292,509 118,240,286 — 118,240,286 — Deerwood (SD) San Diego, CA — 1990 316 2,082,095 18,739,815 15,675,022 2,082,095 34,414,837 36,496,932 (30,453,714 ) 6,043,218 — Del Mar Ridge San Diego, CA — 1998 181 7,801,824 36,948,176 4,246,225 7,801,824 41,194,401 48,996,225 (17,680,819 ) 31,315,406 — Eagle Canyon Chino Hills, CA — 1985 252 1,808,900 16,274,361 10,865,978 1,808,900 27,140,339 28,949,239 (20,747,510 ) 8,201,729 — Edgemont at Bethesda Metro Bethesda, MD — 1989 122 13,092,552 43,907,448 1,674,370 13,092,552 45,581,818 58,674,370 (15,155,907 ) 43,518,463 — Emerson Place Boston, MA G 1962 444 14,855,000 57,566,636 35,014,249 14,855,000 92,580,885 107,435,885 (63,325,270 ) 44,110,615 — Encore at Sherman Oaks, The Sherman Oaks, CA — 1988 174 8,700,000 25,446,003 3,847,449 8,700,000 29,293,452 37,993,452 (10,801,336 ) 27,192,116 — Eviva on Cherokee Denver, CO — 2017 274 10,507,626 100,037,204 151,235 10,507,626 100,188,439 110,696,065 (6,553,585 ) 104,142,480 — EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation December 31, 2019 Description Initial Cost to Company Cost Capitalized Subsequent to Acquisition (Improvements, net) (E) Gross Amount Carried at Close of Period 12/31/19 Apartment Name Location Retail/ Commercial Space Date of Construction Apartment Units Land Building & Fixtures Building & Fixtures Land Building & Fixtures (A) Total (B) Accumulated Depreciation (C) Investment in Real Estate, Net at 12/31/19 Encumbrances Fountains at Emerald Park (fka Emerald Park) Dublin, CA — 2000 324 25,900,000 83,986,217 3,935,049 25,900,000 87,921,266 113,821,266 (25,270,333 ) 88,550,933 — Fremont Center Fremont, CA G 2002 322 25,800,000 78,753,114 4,490,634 25,800,000 83,243,748 109,043,748 (24,471,382 ) 84,572,366 — Gaithersburg Station Gaithersburg, MD G 2013 400 17,500,000 74,678,917 3,537,268 17,500,000 78,216,185 95,716,185 (20,628,153 ) 75,088,032 — Gallery, The Hermosa Beach, CA — 1971 169 18,144,000 46,567,941 2,995,980 18,144,000 49,563,921 67,707,921 (24,741,834 ) 42,966,087 — Gateway at Malden Center Malden, MA G 1988 203 9,209,780 25,722,666 16,463,954 9,209,780 42,186,620 51,396,400 (26,861,288 ) 24,535,112 — Geary Court Yard San Francisco, CA — 1990 165 1,722,400 15,471,429 6,197,853 1,722,400 21,669,282 23,391,682 (15,406,560 ) 7,985,122 — Girard Boston, MA G 2016 160 — 102,450,328 865,330 — 103,315,658 103,315,658 (11,248,402 ) 92,067,256 — Hampshire Place Los Angeles, CA — 1989 259 10,806,000 30,335,330 8,125,571 10,806,000 38,460,901 49,266,901 (19,841,849 ) 29,425,052 — Harbor Steps Seattle, WA G 2000 761 59,403,601 158,829,432 40,880,428 59,403,601 199,709,860 259,113,461 (97,046,373 ) 162,067,088 — Hathaway Long Beach, CA — 1987 385 2,512,500 22,611,912 13,674,471 2,512,500 36,286,383 38,798,883 (27,001,675 ) 11,797,208 — Helios (fka 2nd+Pine) Seattle, WA G 2017 398 18,061,674 206,628,093 110,524 18,061,674 206,738,617 224,800,291 (20,125,380 ) 204,674,911 — Heritage at Stone Ridge Burlington, MA — 2005 180 10,800,000 31,808,335 2,849,652 10,800,000 34,657,987 45,457,987 (17,798,543 ) 27,659,444 — Heritage Ridge Lynwood, WA — 1999 197 6,895,000 18,983,597 4,605,503 6,895,000 23,589,100 30,484,100 (11,968,336 ) 18,515,764 — Hesby North Hollywood, CA — 2013 308 23,299,892 102,700,108 1,653,931 23,299,892 104,354,039 127,653,931 (25,277,554 ) 102,376,377 — Highlands at South Plainfield South Plainfield, NJ — 2000 252 10,080,000 37,526,912 2,592,223 10,080,000 40,119,135 50,199,135 (20,191,766 ) 30,007,369 — Hikari Los Angeles, CA G 2007 128 9,435,760 32,564,240 965,477 9,435,760 33,529,717 42,965,477 (11,609,215 ) 31,356,262 — Hudson Crossing New York, NY G 2003 259 23,420,000 69,977,699 3,000,297 23,420,000 72,977,996 96,397,996 (38,482,671 ) 57,915,325 — Hudson Pointe Jersey City, NJ — 2003 182 5,350,000 41,114,074 6,902,664 5,350,000 48,016,738 53,366,738 (26,064,218 ) 27,302,520 — Hunt Club II Charlotte, NC — (F) — 100,000 — — 100,000 — 100,000 — 100,000 — Huxley, The Redwood City, CA — 2018 137 18,775,028 89,335,476 5,577 18,775,028 89,341,053 108,116,081 (2,362,663 ) 105,753,418 — Ivory Wood Bothell, WA — 2000 144 2,732,800 13,888,282 1,716,006 2,732,800 15,604,288 18,337,088 (8,531,839 ) 9,805,249 — Jia (fka Chinatown Gateway) Los Angeles, CA G 2014 280 14,791,831 77,752,457 816,097 14,791,831 78,568,554 93,360,385 (22,410,277 ) 70,950,108 — Junction 47 (fka West Seattle) Seattle, WA G 2015 206 11,726,305 56,576,329 139,678 11,726,305 56,716,007 68,442,312 (9,832,830 ) 58,609,482 — Kelvin, The (fka Modera) Irvine, CA — 2015 194 15,521,552 64,853,448 593,826 15,521,552 65,447,274 80,968,826 (12,644,037 ) 68,324,789 — Kenwood Mews Burbank, CA — 1991 141 14,100,000 24,662,883 4,164,875 14,100,000 28,827,758 42,927,758 (14,951,144 ) 27,976,614 — Laguna Clara Santa Clara, CA — 1972 264 13,642,420 29,597,400 5,500,048 13,642,420 35,097,448 48,739,868 (19,856,605 ) 28,883,263 — Landings at Port Imperial W. New York, NJ — 1999 276 27,246,045 37,741,050 14,471,631 27,246,045 52,212,681 79,458,726 (33,207,884 ) 46,250,842 — Lane Seattle, WA G 2019 217 13,142,946 71,853,083 (1 ) 13,142,946 71,853,082 84,996,028 — 84,996,028 — Lex, The San Jose, CA — 2017 387 21,817,512 158,778,598 77,511 21,817,512 158,856,109 180,673,621 (8,972,354 ) 171,701,267 — Liberty Park Braintree, MA — 2000 202 5,977,504 26,749,111 6,951,551 5,977,504 33,700,662 39,678,166 (19,975,624 ) 19,702,542 — Liberty Tower Arlington, VA G 2008 235 16,382,822 83,817,078 2,551,120 16,382,822 86,368,198 102,751,020 (31,785,187 ) 70,965,833 — Lincoln Heights Quincy, MA — 1991 336 5,928,400 33,595,262 15,019,958 5,928,400 48,615,220 54,543,620 (37,746,289 ) 16,797,331 — Lindley Apartments Encino, CA — 2004 129 5,805,000 25,705,000 2,055,111 5,805,000 27,760,111 33,565,111 (10,259,804 ) 23,305,307 — Lofts at Kendall Square (fka Kendall Square) Cambridge, MA — 1998 186 18,696,674 78,445,657 6,941,386 18,696,674 85,387,043 104,083,717 (24,300,285 ) 79,783,432 — Lofts at Kendall Square ll (fka 249 Third Street) Cambridge, MA G 2019 84 4,603,326 42,655,411 — 4,603,326 42,655,411 47,258,737 (388,231 ) 46,870,506 — Longacre House New York, NY G 2000 293 73,170,045 53,962,510 4,562,899 73,170,045 58,525,409 131,695,454 (26,269,075 ) 105,426,379 — Longfellow Place Boston, MA G 1975 710 38,264,917 132,175,915 86,857,633 38,264,917 219,033,548 257,298,465 (153,930,179 ) 103,368,286 — Madox Jersey City, NJ G 2013 131 9,679,635 64,594,205 456,215 9,679,635 65,050,420 74,730,055 (4,991,342 ) 69,738,713 — Mantena New York, NY G 2012 98 22,346,513 61,501,158 1,159,451 22,346,513 62,660,609 85,007,122 (18,028,047 ) 66,979,075 — Marina 41 (fka Marina Del Rey) Marina Del Rey, CA — 1973 623 — 168,842,442 9,214,698 — 178,057,140 178,057,140 (53,401,243 ) 124,655,897 — Mariposa at Playa Del Rey (fka Playa Del Rey) Playa Del Rey, CA — 2004 354 60,900,000 89,311,482 6,259,009 60,900,000 95,570,491 156,470,491 (28,260,197 ) 128,210,294 — Mark on 8th Seattle, WA G 2016 174 23,004,387 51,148,861 132,254 23,004,387 51,281,115 74,285,502 (4,399,467 ) 69,886,035 — Market Street Village San Diego, CA — 2006 229 13,740,000 40,757,301 2,433,811 13,740,000 43,191,112 56,931,112 (21,071,334 ) 35,859,778 — Milano Lofts Los Angeles, CA G 1925/2006 99 8,125,216 27,378,784 4,128,987 8,125,216 31,507,771 39,632,987 (9,253,714 ) 30,379,273 — Mill Creek Milpitas, CA — 1991 516 12,858,693 57,168,503 17,604,121 12,858,693 74,772,624 87,631,317 (39,853,420 ) 47,777,897 — Montierra (CA) San Diego, CA — 1990 272 8,160,000 29,360,938 8,510,123 8,160,000 37,871,061 46,031,061 (26,472,405 ) 19,558,656 — EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation December 31, 2019 Description Initial Cost to Company Cost Capitalized Subsequent to Acquisition (Improvements, net) (E) Gross Amount Carried at Close of Period 12/31/19 Apartment Name Location Retail/ Commercial Space Date of Construction Apartment Units Land Building & Fixtures Building & Fixtures Land Building & Fixtures (A) Total (B) Accumulated Depreciation (C) Investment in Real Estate, Net at 12/31/19 Encumbrances Mosaic at Metro Hyattsville, MD — 2008 260 — 59,580,898 1,537,111 — 61,118,009 61,118,009 (23,624,406 ) 37,493,603 — Mountain View Redevelopment Mountain View, CA — (F) — — 882,046 — — 882,046 882,046 — 882,046 — Mozaic at Union Station Los Angeles, CA — 2007 272 8,500,000 52,529,446 2,472,824 8,500,000 55,002,270 63,502,270 (26,004,162 ) 37,498,108 — Murray Hill Tower (fka Murray Hill) New York, NY G 1974 270 75,800,000 102,705,401 10,547,453 75,800,000 113,252,854 189,052,854 (34,480,104 ) 154,572,750 — Next on Sixth Los Angeles, CA G 2017 398 52,509,906 136,635,362 52,028 52,509,906 136,687,390 189,197,296 (6,067,150 ) 183,130,146 — North Pier at Harborside Jersey City, NJ — 2003 297 4,000,159 94,290,590 5,767,779 4,000,159 100,058,369 104,058,528 (53,298,183 ) 50,760,345 — Northglen Valencia, CA — 1988 234 9,360,000 20,778,553 6,828,841 9,360,000 27,607,394 36,967,394 (16,473,980 ) 20,493,414 — Northpark Burlingame, CA — 1972 510 38,607,000 77,472,217 15,236,070 38,607,000 92,708,287 131,315,287 (40,034,278 ) 91,281,009 — Northridge Pleasant Hill, CA — 1974 221 5,524,000 14,691,705 11,618,255 5,524,000 26,309,960 31,833,960 (20,784,027 ) 11,049,933 — Oak Park Combined Agoura Hills, CA — 1989 & 1990 444 3,390,700 30,517,274 11,129,906 3,390,700 41,647,180 45,037,880 (33,598,181 ) 11,439,699 — Oaks Santa Clarita, CA — 2000 520 23,400,000 61,020,438 7,150,916 23,400,000 68,171,354 91,571,354 (38,896,036 ) 52,675,318 — Oakwood Crystal City Arlington, VA — 1987 162 15,400,000 35,474,336 4,164,931 15,400,000 39,639,267 55,039,267 (11,715,439 ) 43,323,828 — Ocean Crest Solana Beach, CA — 1986 146 5,111,200 11,910,438 4,831,677 5,111,200 16,742,115 21,853,315 (11,831,439 ) 10,021,876 — Odin (fka Tallman) Seattle, WA — 2015 301 16,807,519 64,519,515 70,389 16,807,519 64,589,904 81,397,423 (11,050,157 ) 70,347,266 — Old Town Lofts Redmond, WA G 2014 149 7,740,467 44,146,181 821,523 7,740,467 44,967,704 52,708,171 (8,666,808 ) 44,041,363 — Olympus Towers Seattle, WA G 2000 328 14,752,034 73,335,425 10,370,617 14,752,034 83,706,042 98,458,076 (46,375,373 ) 52,082,703 — One Henry Adams San Francisco, CA G 2016 241 30,224,393 139,558,692 22,022 30,224,393 139,580,714 169,805,107 (16,605,628 ) 153,199,479 — One India Street (fka Oakwood Boston) Boston, MA G 1901 94 22,200,000 28,672,979 6,249,693 22,200,000 34,922,672 57,122,672 (9,689,007 ) 47,433,665 — Pacific Place Los Angeles, CA — 2008 430 32,250,000 110,750,000 2,028,500 32,250,000 112,778,500 145,028,500 (31,554,841 ) 113,473,659 — Packard Building Seattle, WA G 2010 61 5,911,041 19,954,959 1,112,353 5,911,041 21,067,312 26,978,353 (3,941,611 ) 23,036,742 — Parc 77 New York, NY G 1903 137 40,504,000 18,025,679 6,560,029 40,504,000 24,585,708 65,089,708 (14,088,276 ) 51,001,432 — Parc Cameron New York, NY G 1927 166 37,600,000 9,855,597 7,590,854 37,600,000 17,446,451 55,046,451 (11,702,099 ) 43,344,352 — Parc Coliseum New York, NY G 1910 177 52,654,000 23,045,751 9,553,310 52,654,000 32,599,061 85,253,061 (19,280,179 ) 65,972,882 — Parc East Towers New York, NY G 1977 324 102,163,000 108,989,402 12,219,604 102,163,000 121,209,006 223,372,006 (56,644,803 ) 166,727,203 — Parc on Powell (fka Parkside at Emeryville) Emeryville, CA G 2015 173 16,667,059 65,073,509 419,037 16,667,059 65,492,546 82,159,605 (12,009,148 ) 70,150,457 — Park Connecticut Washington, D.C. — 2000 142 13,700,000 59,087,519 1,863,350 13,700,000 60,950,869 74,650,869 (16,566,168 ) 58,084,701 — Park Hacienda (fka Hacienda) Pleasanton, CA — 2000 540 43,200,000 128,753,359 6,614,073 43,200,000 135,367,432 178,567,432 (39,974,119 ) 138,593,313 — Park West (CA) Los Angeles, CA — 1987/1990 444 3,033,500 27,302,383 12,126,113 3,033,500 39,428,496 42,461,996 (30,924,343 ) 11,537,653 — Parkside Union City, CA — 1979 208 6,246,700 11,827,453 8,185,992 6,246,700 20,013,445 26,260,145 (13,217,770 ) 13,042,375 — Pearl, The (WA) Seattle, WA G 2008 80 6,972,585 26,527,415 1,051,124 6,972,585 27,578,539 34,551,124 (5,151,187 ) 29,399,937 — Pearl MDR (fka Oakwood Marina Del Rey) Marina Del Rey, CA G 1969 597 — 120,795,359 5,726,479 — 126,521,838 126,521,838 (38,784,120 ) 87,737,718 — Pegasus Los Angeles, CA G 1949/2003 322 18,094,052 81,905,948 6,904,081 18,094,052 88,810,029 106,904,081 (32,523,925 ) 74,380,156 — Playa Pacifica Hermosa Beach, CA — 1972 285 35,100,000 33,473,822 23,756,377 35,100,000 57,230,199 92,330,199 (31,171,766 ) 61,158,433 — Portofino Chino Hills, CA — 1989 176 3,572,400 14,660,994 3,874,242 3,572,400 18,535,236 22,107,636 (14,171,043 ) 7,936,593 — Portofino (Val) Valencia, CA — 1989 216 8,640,000 21,487,126 5,837,031 8,640,000 27,324,157 35,964,157 (17,518,529 ) 18,445,628 — Portside Towers Jersey City, NJ G 1992-1997 527 22,487,006 96,842,913 24,128,821 22,487,006 120,971,734 143,458,740 (89,422,204 ) 54,036,536 — Potrero 1010 San Francisco, CA G 2016 453 40,830,011 181,812,933 518,975 40,830,011 182,331,908 223,161,919 (26,294,704 ) 196,867,215 — Prado (fka Glendale) Glendale, CA — 1988 264 — 67,977,313 5,928,659 — 73,905,972 73,905,972 (21,102,334 ) 52,803,638 — Prime, The Arlington, VA — 2002 281 34,625,000 77,879,740 2,669,467 34,625,000 80,549,207 115,174,207 (32,656,903 ) 82,517,304 — Prism at Park Avenue South (fka 400 Park Avenue South) New York, NY G 2015 269 76,292,169 171,649,131 208,922 76,292,169 171,858,053 248,150,222 (32,299,311 ) 215,850,911 — Promenade at Town Center I & II Valencia, CA — 2001 564 28,200,000 69,795,915 10,883,962 28,200,000 80,679,877 108,879,877 (44,391,535 ) 64,488,342 — Providence Bothell, WA — 2000 200 3,573,621 19,055,505 4,537,035 3,573,621 23,592,540 27,166,161 (12,025,867 ) 15,140,294 — Quarry Hills Quincy, MA — 2006 316 26,900,000 84,411,162 4,202,638 26,900,000 88,613,800 115,513,800 (25,515,603 ) 89,998,197 — Radius Uptown Denver, CO — 2017 372 13,644,960 121,899,084 640,652 13,644,960 122,539,736 136,184,696 (9,914,578 ) 126,270,118 — Red 160 (fka Redmond Way) Redmond, WA G 2011 250 15,546,376 65,320,010 1,448,098 15,546,376 66,768,108 82,314,484 (20,622,372 ) 61,692,112 — Redmond Court Bellevue, WA — 1977 206 10,300,000 33,488,745 1,211,705 10,300,000 34,700,450 45,000,450 (11,274,160 ) 33,726,290 — EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation December 31, 2019 Description Initial Cost to Company Cost Capitalized Subsequent to Acquisition (Improvements, net) (E) Gross Amount Carried at Close of Period 12/31/19 Apartment Name Location Retail/ Commercial Space Date of Construction Apartment Units Land Building & Fixtures Building & Fixtures Land Building & Fixtures (A) Total (B) Accumulated Depreciation (C) Investment in Real Estate, Net at 12/31/19 Encumbrances Regency Palms Huntington Beach, CA — 1969 310 1,857,400 16,713,254 7,272,427 1,857,400 23,985,681 25,843,081 (19,161,878 ) 6,681,203 — Reserve at Clarendon Centre, The Arlington, VA G 2003 252 10,500,000 52,812,935 4,855,911 10,500,000 57,668,846 68,168,846 (32,743,477 ) 35,425,369 — Reserve at Eisenhower, The Alexandria, VA — 2002 226 6,500,000 34,585,060 4,852,458 6,500,000 39,437,518 45,937,518 (22,240,250 ) 23,697,268 — Reserve at Empire Lakes Rancho Cucamonga, CA — 2005 467 16,345,000 73,080,670 3,893,736 16,345,000 76,974,406 93,319,406 (39,080,433 ) 54,238,973 — Reserve at Fairfax Corner Fairfax, VA — 2001 652 15,804,057 63,129,051 12,239,068 15,804,057 75,368,119 91,172,176 (44,632,394 ) 46,539,782 — Reserve at Mountain View (fka Mountain View) Mountain View, CA — 1965 180 27,000,000 33,029,605 7,608,914 27,000,000 40,638,519 67,638,519 (12,863,114 ) 54,775,405 — Reserve at Potomac Yard Alexandria, VA — 2002 588 11,918,917 68,862,641 17,256,235 11,918,917 86,118,876 98,037,793 (45,846,659 ) 52,191,134 — Reserve at Town Center I-III (WA) Mill Creek, WA G 2001, 2009, 2014 584 16,768,705 77,623,664 8,538,253 16,768,705 86,161,917 102,930,622 (36,697,179 ) 66,233,443 — Residences at Westgate I (fka Westgate II) Pasadena, CA G 2014 252 17,859,785 109,259,858 477,844 17,859,785 109,737,702 127,597,487 (27,267,435 ) 100,330,052 — Residences at Westgate II (fka Westgate III) Pasadena, CA G 2015 88 12,118,248 40,486,467 97,831 12,118,248 40,584,298 52,702,546 (7,453,042 ) 45,249,504 — Rianna I & II Seattle, WA G 2000/2002 156 4,430,000 29,298,096 1,408,357 4,430,000 30,706,453 35,136,453 (12,521,975 ) 22,614,478 — Ridgewood Village I&II San Diego, CA — 1997 408 11,809,500 34,004,048 6,152,653 11,809,500 40,156,701 51,966,201 (27,801,818 ) 24,164,383 — Riva Terra I (fka Redwood Shores) Redwood City, CA — 1986 304 34,963,355 84,587,658 6,552,889 34,963,355 91,140,547 126,103,902 (27,578,186 ) 98,525,716 — Riva Terra II (fka Harborside) Redwood City, CA — 1986 149 17,136,645 40,536,531 3,532,047 17,136,645 44,068,578 61,205,223 (12,214,368 ) 48,990,855 — Riverpark Redmond, WA G 2009 321 14,355,000 80,894,049 4,145,694 14,355,000 85,039,743 99,394,743 (27,531,587 ) 71,863,156 — Rivington, The Hoboken, NJ — 1999 240 34,340,640 112,522,073 2,385,966 34,340,640 114,908,039 149,248,679 (11,203,805 ) 138,044,874 — Rosecliff II Quincy, MA — 2005 130 4,922,840 30,202,160 1,575,032 4,922,840 31,777,192 36,700,032 (11,139,316 ) 25,560,716 — Sakura Crossing Los Angeles, CA G 2009 230 14,641,990 42,858,010 1,508,474 14,641,990 44,366,484 59,008,474 (16,104,349 ) 42,904,125 — Saxton Seattle, WA G 2019 325 38,805,400 128,661,766 1,221 38,805,400 128,662,987 167,468,387 (1,106,731 ) 166,361,656 — Seventh & James Seattle, WA G 1992 96 663,800 5,974,803 4,559,907 663,800 10,534,710 11,198,510 (8,193,189 ) 3,005,321 — Sheffield Court Arlington, VA — 1986 597 3,342,381 31,337,332 16,837,180 3,342,381 48,174,512 51,516,893 (39,604,857 ) 11,912,036 — Siena Terrace Lake Forest, CA — 1988 356 8,900,000 24,083,024 7,673,467 8,900,000 31,756,491 40,656,491 (22,703,857 ) 17,952,634 — Skycrest Valencia, CA — 1999 264 10,560,000 25,574,457 6,439,296 10,560,000 32,013,753 42,573,753 (19,701,076 ) 22,872,677 — Skyhouse Denver Denver, CO G 2017 354 13,562,331 126,360,318 260,188 13,562,331 126,620,50

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
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 any unconsolidated properties/entities.
Real Estate Assets And Depreciation Of Investment In Real Estate	Real Estate Assets and Depreciation of Investment in Real Estate The Company expects that substantially all of its transactions will be accounted for as asset acquisitions. In an asset acquisition, the Company is required to capitalize transaction costs and allocate the purchase price on a relative fair value basis. For the years ended December 31, 2019 and 2018, all acquisitions were considered asset acquisitions. 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 units 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 8 for more information on ground lease intangibles. • 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. • 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 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. 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 investment 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, legal, regulatory and environmental concerns, the Company’s intent and ability to hold the related asset, as well as any significant cost overruns on development properties. 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 make an estimate of the fair value for the particular asset and would record an impairment loss for the difference between the estimated fair value and the carrying amount of the asset. In determining the future undiscounted cash flows or the estimated fair value of an asset there is judgment in estimating the expected future rental revenues, operating expenses and discount and capitalization rates. • 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, 2019, 2018 and 2017, the Company capitalized $14.2 million, $13.2 million and $14.7 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 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 Deposit 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 may seek 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 derivative 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.
Leases and Revenue Recognition	Leases and 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 leases (including commercial leases) is also recorded on a straight-line basis. Retail 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. The majority of the Company’s revenue is derived from residential, retail and other lease income, which are accounted for under the new leasing standard effective January 1, 2019 (discussed below in Recently Adopted Accounting Pronouncements The Company is a lessor for its residential and retail leases and is a lessee for its corporate headquarters and regional offices and ground leases for land underlying current operating properties or projects under development. If applicable, lease agreements must be evaluated to determine the accounting treatment as a finance or operating lease in accordance with the new leasing standard. A lease is classified as a finance lease if it meets any of the following criteria: (a) Ownership of the underlying asset is transferred to the lessee by the end of the lease term; (b) the lessee has and is reasonably certain to exercise an option to purchase the underlying asset; (c) the lease term is for the major part of the remaining economic life of the underlying asset; (d) the present value of future minimum lease payments is equal to substantially all of the fair value of the underlying asset; and (e) the underlying asset is expected to have no alternative use to the lessor at the end of the lease term due to its specialized nature. The new leasing standard also requires the recognition on the balance sheet of: (a) a liability for the lease obligation (initially measured at the present value of the future lease payments not yet paid over the lease term); and (b) an asset for its right to use the underlying asset (initially equal to the lease liability). See Recently Adopted Accounting Pronouncements The Company’s revenue streams that are not accounted for under the new leasing standard include: • Parking revenue – The Company’s parking revenue, not related to leasing, is derived primarily from monthly and transient daily parking and is accounted for at the point in time when control of the goods or services transfers to the customer and our performance obligation is satisfied. • Other rental and non-rental related revenue – The Company receives other income, including, but not limited to: (a) ancillary income, such as laundry, renters insurance and cable income; (b) net settlement income or collections; and (c) miscellaneous fee income. • Fee and asset management revenue – The Company received management fee revenue as the property manager for two unconsolidated joint ventures for which it had an ownership interest during part of the year but no longer owns as of December 31, 2019. • Gains or losses on sales of real estate properties – The Company accounts for the sale of real estate properties and any related gain recognition in accordance with the accounting guidance applicable to sales of real estate, which establishes standards for recognition of profit on all real estate sales transactions. The Company recognizes the sale, and associated gain or loss from the disposition, provided that the earnings process is complete and the Company does not have significant continuing involvement. A gain or loss is recognized when the criteria for an asset to be derecognized are met, which include when a contract exists and the buyer obtained control of the nonfinancial asset that was sold. The Company’s rental income detail by leasing and revenue recognition standards along with the percentages of rental income are disclosed in the table below for the years ended December 31, 2019 and 2018 (amounts in thousands). Year Ended December 31, 2019 Year Ended December 31, 2018 Income Type $ Rental Income % of Rental Income $ Rental Income % of Rental Income Residential and retail rent $ 2,486,189 $ 2,369,552 Utility recoveries ("RUBS") 68,576 63,218 Parking rent 37,905 33,757 Storage rent 3,816 3,674 Pet rent 11,617 11,185 Leasing standard (1) 2,608,103 96.6 % 2,481,386 96.3 % Parking revenue 28,272 26,743 Other revenue 64,316 69,552 Revenue recognition standard 92,588 3.4 % 96,295 3.7 % Rental income $ 2,700,691 100.0 % $ 2,577,681 100.0 % (1) See Note 8 for additional details on leasing revenue.
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 is 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: 2019 2018 2017 Expected volatility (1) 16.3 % 14.8 % 15.3 % Expected life (2) 5 years 5 years 5 years Expected dividend yield (3) 3.10 % 3.09 % 3.08 % Risk-free interest rate (4) 2.43 % 2.52 % 1.93 % Option valuation per share $ 8.06 $ 6.15 $ 5.86 (1) Expected volatility – Estimated based on the historical five-year (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 at 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 EQR has elected to be taxed as a REIT. This, along with the nature of the operations of its operating properties, resulted in no provision for federal income taxes being 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. The Company’s provision for income and other tax expense (benefit) was as follows for the years ended December 31, 2019, 2018 and 2017 (amounts in thousands): Year Ended December 31, 2019 2018 2017 State and local income, franchise and excise tax (benefit) $ 963 $ 878 $ 478 Alternative minimum tax credit (benefit) (1) (3,244 ) — — Income and other tax expense (benefit) (2) $ (2,281 ) $ 878 $ 478 (1) As provided in recent tax legislation which repealed the alternative minimum tax on corporations, in 2019 the Company claimed/received $1.6 million of refunds of various alternative minimum tax credit carryovers generated in prior tax years. The provision allows for carryover amounts to be refunded over four years, with 50% available in the first year. The remaining $1.6 million, which will be claimed over three years, was accrued in 2019, for a total expected benefit of $3.2 million. (2) All provisions for income tax amounts are current and none are deferred. During the years ended December 31, 2019, 2018 and 2017, the tax character of the Company’s dividends and distributions were as follows (unaudited): Year Ended December 31, 2019 (1) 2018 (2) 2017 (3) Tax character of dividends and distributions: Ordinary dividends $ 1.39604 $ 1.84454 $ 1.22126 Long-term capital gain 0.61243 0.21423 0.18959 Unrecaptured section 1250 gain 0.23403 0.06498 0.10040 Dividends and distributions per Common Share/Unit outstanding $ 2.24250 $ 2.12375 $ 1.51125 (1) The Company’s fourth quarter 2019 dividends and distributions of $0.5675 per Common Share/Unit outstanding will be included as taxable income in calendar year 2020. (2) The Company’s fourth quarter 2018 dividends and distributions of $0.54 per Common Share/Unit outstanding was included as taxable income in calendar year 2019. (3 ) The Company’s fourth quarter 2017 dividends and distributions of $0.50375 per Common Share/Unit outstanding was 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, 2019 and 2018 was approximately $13.7 billion and $14.0 billion, respectively.
Principals of Consolidation	Principles of Consolidation The Company may hold an interest in subsidiaries, partnerships, joint ventures and other similar entities and accounts for these interests in accordance with the consolidation guidance. The Company first determines whether to consolidate the entity as a variable interest entity (“VIE”) or account for the interest under the equity method of accounting. Equity investors of VIEs do not have sufficient equity at risk to finance their activities without additional subordinated financial support or do not have substantive participating rights. The Company consolidates an entity when it is considered to be the primary beneficiary or when it controls the entity through ownership of a majority voting interest. A primary beneficiary has the power to direct the activities that most significantly impact the VIE’s performance and has the obligation to absorb the expected losses or the right to receive the expected residual returns that could potentially be significant to the VIE. In evaluating whether the entity is a VIE, the Company considers several factors, including, but not limited to, funding and financing sources, business purpose of the entity, related parties, developer and property management fees and agreement terms regarding major decisions, participating and voting rights, contributions and distributions.
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 June 2016, the Financial Accounting Standards Board (“ FASB”) Recently Adopted Accounting Pronouncements In FASB Revenue from Contracts with Customers Additionally, as part of the revenue recognition standard, the FASB issued amendments related to partial sales of real estate. Adoption of the 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 standards. In February 2016, the FASB issued a leases standard which sets out principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessors and lessees). The standard requires the following: • 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 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 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 Company adopted this standard as required effective January 1, 2019 using a modified retrospective method and the Company applied the guidance as of the adoption date and elected certain practical expedients, as described below. The standard impacted our consolidated balance sheets but did not impact our consolidated statements of operations. Right-of-use (“ROU”) assets and lease liabilities where the Company is the lessee were recognized for various corporate office leases and ground leases. The Company recorded ROU assets and related lease liabilities to its opening balance sheet upon adoption on January 1, 2019 of $434.2 million and $278.3 million, respectively. The Company calculated the net present value of the lease liabilities on January 1, 2019 and reclassed the following amounts from other assets and other liabilities to record our initial ROU assets (amounts in thousands): January 1, 2019 Balance Sheet Reclass: Initial lease liabilities $ 278,287 Reclassifications: Prepaid ground leases 17,886 Other Assets Ground lease intangibles – below market, net 166,230 Other Assets Ground lease intangibles – above market, net (2,110 ) Other Liabilities Straight-line rent liabilities (1) (26,092 ) Other Liabilities Initial right-of-use assets $ 434,201 (1) Straight-line rent liabilities relate to corporate office leases and certain ground leases. The Company elected the practical expedient to not reassess the classification of existing operating leases. As of January 1, 2019, any new or modified ground leases may be classified as financing leases unless they meet certain conditions. When there is a material lease modification, the Company is required to reassess the classification and remeasure the lease liability. In July 2018, the FASB issued an amendment to the 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 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. See Note 8 for additional discussion regarding the new lease standard. 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 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 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 standard as required effective January 1, 2019 and it did not have a material effect on its consolidated results of operations or financial position.
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 balance of $1.2 million at December 31, 2019. 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 $10.2 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, 2019 the Company estimates the value of Noncontrolling Interest distributions for these four properties would have been approximately $78.9 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, 2019 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, 2019
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 291 76,265 Master-Leased Property – Consolidated 1 162 Partially Owned Properties – Consolidated 17 3,535 309 79,962

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Summary Of Significant Accounting Policies [Abstract]
Schedule of Rental Income Detail by Leasing and Revenue Recognition Standards Along with Percentages of Rental Income	The Company’s rental income detail by leasing and revenue recognition standards along with the percentages of rental income are disclosed in the table below for the years ended December 31, 2019 and 2018 (amounts in thousands). Year Ended December 31, 2019 Year Ended December 31, 2018 Income Type $ Rental Income % of Rental Income $ Rental Income % of Rental Income Residential and retail rent $ 2,486,189 $ 2,369,552 Utility recoveries ("RUBS") 68,576 63,218 Parking rent 37,905 33,757 Storage rent 3,816 3,674 Pet rent 11,617 11,185 Leasing standard (1) 2,608,103 96.6 % 2,481,386 96.3 % Parking revenue 28,272 26,743 Other revenue 64,316 69,552 Revenue recognition standard 92,588 3.4 % 96,295 3.7 % Rental income $ 2,700,691 100.0 % $ 2,577,681 100.0 % (1) See Note 8 for additional details on leasing revenue.
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology	The fair value of the option grants is 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: 2019 2018 2017 Expected volatility (1) 16.3 % 14.8 % 15.3 % Expected life (2) 5 years 5 years 5 years Expected dividend yield (3) 3.10 % 3.09 % 3.08 % Risk-free interest rate (4) 2.43 % 2.52 % 1.93 % Option valuation per share $ 8.06 $ 6.15 $ 5.86 (1) Expected volatility – Estimated based on the historical five-year (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 at 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’s provision for income and other tax expense (benefit) was as follows for the years ended December 31, 2019, 2018 and 2017 (amounts in thousands): Year Ended December 31, 2019 2018 2017 State and local income, franchise and excise tax (benefit) $ 963 $ 878 $ 478 Alternative minimum tax credit (benefit) (1) (3,244 ) — — Income and other tax expense (benefit) (2) $ (2,281 ) $ 878 $ 478 (1) As provided in recent tax legislation which repealed the alternative minimum tax on corporations, in 2019 the Company claimed/received $1.6 million of refunds of various alternative minimum tax credit carryovers generated in prior tax years. The provision allows for carryover amounts to be refunded over four years, with 50% available in the first year. The remaining $1.6 million, which will be claimed over three years, was accrued in 2019, for a total expected benefit of $3.2 million. (2) All provisions for income tax amounts are current and none are deferred.
Tax Treatment Of Dividends And Distributions	During the years ended December 31, 2019, 2018 and 2017, the tax character of the Company’s dividends and distributions were as follows (unaudited): Year Ended December 31, 2019 (1) 2018 (2) 2017 (3) Tax character of dividends and distributions: Ordinary dividends $ 1.39604 $ 1.84454 $ 1.22126 Long-term capital gain 0.61243 0.21423 0.18959 Unrecaptured section 1250 gain 0.23403 0.06498 0.10040 Dividends and distributions per Common Share/Unit outstanding $ 2.24250 $ 2.12375 $ 1.51125 (1) The Company’s fourth quarter 2019 dividends and distributions of $0.5675 per Common Share/Unit outstanding will be included as taxable income in calendar year 2020. (2) The Company’s fourth quarter 2018 dividends and distributions of $0.54 per Common Share/Unit outstanding was included as taxable income in calendar year 2019. (3 ) The Company’s fourth quarter 2017 dividends and distributions of $0.50375 per Common Share/Unit outstanding was included as taxable income in calendar year 2018.
Schedule of Reclassification's to Initial Right-of-use Assets	The Company calculated the net present value of the lease liabilities on January 1, 2019 and reclassed the following amounts from other assets and other liabilities to record our initial ROU assets (amounts in thousands): January 1, 2019 Balance Sheet Reclass: Initial lease liabilities $ 278,287 Reclassifications: Prepaid ground leases 17,886 Other Assets Ground lease intangibles – below market, net 166,230 Other Assets Ground lease intangibles – above market, net (2,110 ) Other Liabilities Straight-line rent liabilities (1) (26,092 ) Other Liabilities Initial right-of-use assets $ 434,201 (1) Straight-line rent liabilities relate to corporate office leases and certain ground leases.

Equity, Capital and Other Int_2

Equity, Capital and Other Interests (Tables)	12 Months Ended
	Dec. 31, 2019
Changes in Issued and Outstanding Common Shares and Units	The following table presents the changes in the Company’s issued and outstanding Common Shares and Units for the years ended December 31, 2019, 2018 and 2017: 2019 2018 2017 Common Shares Common Shares outstanding at January 1, 369,405,161 368,018,082 365,870,924 Common Shares Issued: Conversion of OP Units 313,940 131,477 1,149,284 Exercise of share options 1,745,050 1,056,388 846,137 Employee Share Purchase Plan (ESPP) 48,131 75,414 68,286 Restricted share grants, net 158,602 123,800 83,451 Common Shares outstanding at December 31, 371,670,884 369,405,161 368,018,082 Units Units outstanding at January 1, 13,904,035 13,768,438 14,626,075 Restricted unit grants, net 141,220 267,074 291,647 Conversion of OP Units to Common Shares (313,940 ) (131,477 ) (1,149,284 ) Units outstanding at December 31, 13,731,315 13,904,035 13,768,438 Total Common Shares and Units outstanding at December 31, 385,402,199 383,309,196 381,786,520 Units Ownership Interest in Operating Partnership 3.6 % 3.6 % 3.6 %
Changes in Redemption Value of Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	The following table presents the changes in the redemption value of the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners for the years ended December 31, 2019, 2018 and 2017, respectively (amounts in thousands): 2019 2018 2017 Balance at January 1, $ 379,106 $ 366,955 $ 442,092 Change in market value 82,283 13,922 (41,916 ) Change in carrying value 2,011 (1,771 ) (33,221 ) Balance at December 31, $ 463,400 $ 379,106 $ 366,955
Issued and Outstanding Preferred Shares and Preference Units	The following table presents the Company’s issued and outstanding Preferred Shares/Preference Units as of December 31, 2019 and 2018: Amounts in thousands Annual Call Dividend Per December 31, December 31, Date (1) Share/Unit (2) 2019 2018 Preferred Shares/Preference Units of beneficial interest, $0.01 par value; 100,000,000 shares authorized: 8.29% Series K Cumulative Redeemable Preferred Shares/Preference Units; liquidation value $50 per share/unit; 745,600 shares/units issued and outstanding as of December 31, 2019 and 2018 12/10/26 $ 4.145 $ 37,280 $ 37,280 $ 37,280 $ 37,280 (1) On or after the call date, redeemable Preferred Shares/Preference Units may be redeemed for cash at the option of the Company or the Operating Partnership, respectively, in whole or in part, at a redemption price equal to the liquidation price per share/unit, plus accrued and unpaid distributions, if any. (2) Dividends on Preferred Shares/Preference Units are payable quarterly.
ERPOP [Member]
Changes in Issued and Outstanding Common Shares and Units	The following table presents the changes in the Operating Partnership’s issued and outstanding General Partner Units and Limited Partner Units for the years ended December 31, 2019, 2018 and 2017: 2019 2018 2017 General and Limited Partner Units General and Limited Partner Units outstanding at January 1, 383,309,196 381,786,520 380,496,999 Issued to General Partner: Exercise of EQR share options 1,745,050 1,056,388 846,137 EQR’s Employee Share Purchase Plan (ESPP) 48,131 75,414 68,286 EQR’s restricted share grants, net 158,602 123,800 83,451 Issued to Limited Partners: Restricted unit grants, net 141,220 267,074 291,647 General and Limited Partner Units outstanding at December 31, 385,402,199 383,309,196 381,786,520 Limited Partner Units Limited Partner Units outstanding at January 1, 13,904,035 13,768,438 14,626,075 Limited Partner restricted unit grants, net 141,220 267,074 291,647 Conversion of Limited Partner OP Units to EQR Common Shares (313,940 ) (131,477 ) (1,149,284 ) Limited Partner Units outstanding at December 31, 13,731,315 13,904,035 13,768,438 Limited Partner Units Ownership Interest in Operating Partnership 3.6 % 3.6 % 3.6 %

Real Estate (Tables)

Real Estate (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 (amounts in thousands): 2019 2018 Land $ 5,936,188 $ 5,875,803 Depreciable property: Buildings and improvements 18,904,686 18,232,625 Furniture, fixtures and equipment 1,916,458 1,722,231 In-Place lease intangibles 497,957 481,045 Projects under development: Land 23,531 25,429 Construction-in-progress 158,099 83,980 Land held for development: Land 64,460 61,038 Construction-in-progress 32,228 28,871 Investment in real estate 27,533,607 26,511,022 Accumulated depreciation (7,276,786 ) (6,696,281 ) Investment in real estate, net $ 20,256,821 $ 19,814,741
Acquired Properties From Unaffiliated Parties	During the year ended December 31, 2019, the Company acquired the following from unaffiliated parties (purchase price in thousands): Properties Apartment Units Purchase Price Rental Properties – Consolidated (1) 13 3,540 $ 1,494,689 Land Parcels (four) (2) — — 19,832 Total 13 3,540 $ 1,514,521 (1) Purchase price includes an allocation of approximately $268.3 million to land and $1.229 billion to depreciable property (inclusive of capitalized closing costs). (2) Purchase price includes an allocation of approximately $16.7 million to vacant land and $4.9 million to construction-in-progress (inclusive of capitalized closing costs). Land parcels include entry into two long-term ground leases for land projects under development in the Washington D.C. market, of which one land parcel is subject to a fully prepaid ground lease. See Notes 6 and 8 for additional discussion. During the year ended December 31, 2018, the Company acquired 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).
Disposed Properties to Unaffiliated Parties	During the year ended December 31, 2019, the Company disposed of the following to unaffiliated parties (sales price in thousands): Properties Apartment Units Sales Price Rental Properties – Consolidated 11 2,361 $ 1,080,675 Rental Properties – Unconsolidated (1) 2 945 394,500 Land Parcels (two) — — 2,100 Total 13 3,306 $ 1,477,275 (1) The Company owned a 20% interest in both unconsolidated rental properties. Sales price listed is the gross sales price. The Company received net sales proceeds of approximately $78.3 million. 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

Commitments to Acquire_Dispos_2

Commitments to Acquire/Dispose of Real Estate (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments To Acquire Dispose Of Real Estate [Abstract]
Separate Agreements to Dispose	The Company has entered into separate agreements to dispose of the following (sales price in thousands): Properties Apartment Units Sales Price Rental Properties – Consolidated 4 1,416 $ 723,500 Land Parcels (two) — — 55,150 Total 4 1,416 $ 778,650

Investments in Partially Owne_2

Investments in Partially Owned Entities (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 December 31, 2018 December 31, 2019 December 31, 2018 Ownership Percentage Investments in Unconsolidated Entities: Operating Property (VIE) (1) $ 40,361 $ 42,365 33.3% Operating Properties (Non-VIE) (2) — 10,494 20.0% Real Estate Technology/Other 11,877 5,490 Varies Investments in Unconsolidated Entities $ 52,238 $ 58,349 (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 as of December 31, 2018. During the year ended December 31, 2019, the Company and its joint venture partner sold both properties under separate agreements to unaffiliated parties. See Note 4 for additional discussion.

Restricted Deposits (Tables)

Restricted Deposits (Tables)	12 Months Ended
	Dec. 31, 2019
Deposits Restricted [Abstract]
Restricted Deposits	The following table presents the Company’s restricted deposits as of December 31, 2019 and 2018 (amounts in thousands): December 31, 2019 December 31, 2018 Mortgage escrow deposits: Real estate taxes and insurance $ — $ 876 Replacement reserves 8,543 8,641 Mortgage principal reserves/sinking funds 9,689 9,754 Other — 852 Mortgage escrow deposits 18,232 20,123 Restricted cash: Tax-deferred (1031) exchange proceeds 14,232 — Earnest money on pending acquisitions — 5,000 Restricted deposits on real estate investments 658 540 Resident security and utility deposits 37,140 35,659 Other 984 7,549 Restricted cash 53,014 48,748 Restricted deposits $ 71,246 $ 68,871

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Summary of Lease Income Types Relating to Lease Payments	The following table presents the lease income types relating to lease payments for residential and retail leases for the year ended December 31, 2019 (amounts in thousands): Year Ended December 31, 2019 Lease Income Type Residential Leases Retail Leases Total Residential and retail rent $ 2,414,201 $ 71,988 $ 2,486,189 Utility recoveries (RUBS income) (1) 67,659 917 68,576 Parking rent 37,557 348 37,905 Storage rent 3,745 71 3,816 Pet rent 11,617 — 11,617 Total lease revenue (2) $ 2,534,779 $ 73,324 $ 2,608,103 (1) RUBS income primarily consists of variable payments representing the recovery of utility costs from residents. (2 ) Excludes other rental income of $92.6 million for the year ended December 31, 2019, which is accounted for under the revenue recognition standard discussed in Note 2.
Summary of Right-of-Use Assets and Related Lease Liabilities	The following table presents the Company’s ROU assets and related lease liabilities as of December 31, 2019 (amounts in thousands): 2019 Right-of-use assets: Corporate office leases $ 41,596 Ground leases (finance) 57,982 Ground leases (operating) 413,196 Right-of-use assets $ 512,774 Lease liabilities: Corporate office leases $ 43,105 Ground leases (finance) 23,239 Ground leases (operating) 264,990 Lease liabilities $ 331,334
Summary of Ground Lease Intangibles	The following table summarizes the Company’s ground lease intangibles as of December 31, 2019 and 2018 (amounts in thousands): Description 2019 2018 Assets Ground lease intangibles $ 189,518 $ 191,918 Accumulated amortization (29,861 ) (25,688 ) Ground lease intangible assets, net (1) $ 159,657 $ 166,230 Liabilities Ground lease intangibles $ — $ 2,400 Accumulated amortization — (290 ) Ground lease intangible liabilities, net (1) $ — $ 2,110 (1 ) As of December 31, 2019, ground lease intangibles, net of accumulated amortization are included within the ROU assets on the consolidated balance sheets. As of December 31, 2018, the ground lease intangibles were included within other assets and other liabilities on the consolidated balance sheets.
Summary of the Effect of the Amortization for Ground Lease Intangibles	The following table provides a summary of the effect of the amortization for ground lease intangibles on the Company’s accompanying consolidated statements of operations and comprehensive income for the years ended December 31, 2019, 2018 and 2017 (amounts in thousands): Description Income Statement Location 2019 2018 2017 Ground lease intangible amortization Property and Maintenance $ (4,463 ) $ (4,463 ) $ (4,369 )
Summary of Aggregate Amortization for Ground Lease Intangibles	The following table provides a summary of the aggregate amortization for ground lease intangibles for each of the next five years (amounts in thousands): 2020 2021 2022 2023 2024 Ground lease intangibles $ (4,463 ) $ (4,463 ) $ (4,463 ) $ (4,463 ) $ (4,463 )
Summary of Quantitative Disclosures for Lessees	The following tables illustrate the quantitative disclosures for lessees as of and for the year ended December 31, 2019 (amounts in thousands): Year Ended December 31, 2019 Lease cost: Finance lease cost: Amortization of right-of-use assets $ — Interest on lease liabilities (capitalized) 225 Operating lease cost: Corporate office leases 3,937 Ground leases 22,198 Variable lease cost: Corporate office leases 1,489 Ground leases 3,700 Total lease cost $ 31,549 December 31, 2019 Other information: Cash paid for amounts included in the measurement of lease liabilities: Investing cash flows from finance leases (capitalized) $ 34,922 Operating cash flows from operating leases: Corporate office leases $ 5,494 Ground leases $ 16,837 ROU assets obtained in exchange for new finance lease liabilities $ 23,201 ROU assets obtained in exchange for new operating lease liabilities: Corporate office leases $ 44,298 Ground leases $ 422,018 Weighted-average remaining lease term – finance leases (1) 19.7 years Weighted-average remaining lease term – operating leases: Corporate office leases 18.1 years Ground leases 56.2 years Weighted-average discount rate – finance leases 3.0 % Weighted-average discount rate – operating leases: Corporate office leases 3.2 % Ground leases 5.0 % (1 ) The weighted-average remaining lease term – finance leases does not include the remaining term of a fully prepaid finance lease entered into during the year ended December 31, 2019.
Summary of Undiscounted Cash Flows for Contractual Obligations for Minimum Rent Payments/Receipts	The following table summarizes the Company’s undiscounted cash flows for contractual obligations for minimum rent payments/receipts under operating and financing leases for the next five years and thereafter as of December 31, 2019: (Payments)/Receipts Due by Year (in thousands) 2020 2021 2022 2023 2024 Thereafter Total Finance Leases: Minimum Rent Payments (a) $ (567 ) $ (578 ) $ (590 ) $ (601 ) $ (614 ) $ (33,850 ) $ (36,800 ) Operating Leases: Minimum Rent Payments (a) $ (16,914 ) $ (17,161 ) $ (16,907 ) $ (16,998 ) $ (17,330 ) $ (979,172 ) $ (1,064,482 ) Minimum Rent Receipts (b) $ 64,527 $ 61,817 $ 58,204 $ 50,906 $ 43,784 $ 154,898 $ 434,136 (a) Minimum basic rent due for corporate office leases and base rent due on ground leases where the Company is the lessee. (b) Minimum basic rent receipts due for various retail space where the Company is the lessor. Excludes residential leases due to their short-term nature.
Summary of Reconciliation of Lease Liabilities	The following table provides a reconciliation of lease liabilities from our undiscounted cash flows for minimum rent payments as of December 31, 2019 (amounts in thousands): 2019 Total minimum rent payments $ 1,101,282 Less: Lease discount 769,948 Lease liabilities $ 331,334

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Instrument [Line Items]
Summary of Mortgage Notes Payable Activity	The following tables summarize the Company’s mortgage notes payable activity for the years ended December 31, 2019 and 2018, respectively (amounts in thousands): Mortgage notes payable, net as of December 31, 2018 Proceeds Lump sum payoffs Scheduled principal repayments Amortization of premiums/ discounts Amortization of deferred financing costs, net (1) Mortgage notes payable, net as of December 31, 2019 Fixed Rate Debt: Secured – Conventional $ 1,885,407 $ 288,120 (2) $ (584,536 ) $ (6,308 ) $ (7,999 ) $ 15 $ 1,574,699 Floating Rate Debt: Secured – Conventional 6,357 7,651 (3) (5,920 ) (500 ) — (538 ) 7,050 Secured – Tax Exempt 493,706 — (152,565 ) — 16,617 2,103 359,861 Floating Rate Debt 500,063 7,651 (158,485 ) (500 ) 16,617 1,565 366,911 Total $ 2,385,470 $ 295,771 $ (743,021 ) $ (6,808 ) $ 8,618 $ 1,580 $ 1,941,610 (1 ) Represents amortization of deferred financing costs, net of debt financing costs. (2 ) Obtained 3.94% fixed rate mortgage debt held in a Fannie Mae loan pool maturing on March 1, 2029. (3 ) Obtained variable rate construction mortgage debt that is non-recourse to the Company maturing on June 25, 2022 (total commitment of $67.6 million). Mortgage notes payable, net as of December 31, 2017 Proceeds Lump sum payoffs Scheduled principal repayments Amortization of premiums/ discounts Amortization of deferred financing costs, net (1) Mortgage notes payable, net as of December 31, 2018 Fixed Rate Debt: Secured – Conventional $ 2,982,344 $ — $ (1,093,705 ) $ (6,029 ) $ 719 $ 2,078 $ 1,885,407 Floating Rate Debt: Secured – Conventional 6,948 — — (600 ) — 9 6,357 Secured – Tax Exempt 629,430 96,935 (2) (254,234 ) — 19,425 2,150 493,706 Floating Rate Debt 636,378 96,935 (254,234 ) (600 ) 19,425 2,159 500,063 Total $ 3,618,722 $ 96,935 $ (1,347,939 ) $ (6,629 ) $ 20,144 $ 4,237 $ 2,385,470 (1 ) Represents amortization of deferred financing costs, net of debt financing costs. (2 ) Reissued floating rate tax-exempt mortgage bonds which mature on April 1, 2042, remarket weekly and are guaranteed by ERPOP.
Summary of Debt Extinguishment Costs on Mortgages Recorded as Additional Interest Expense	The following table summarizes the Company’s debt extinguishment costs on mortgages recorded as additional interest expense during the years ended December 31, 2019 and 2018, respectively (amounts in thousands): Description 2019 2018 Prepayment premiums/penalties $ 3,381 $ 22,110 Write-offs of unamortized deferred financing costs 2,273 2,957 Write-offs of unamortized (premiums)/discounts/OCI 6,153 16,268 Total $ 11,807 $ 41,335
Summary of Notes Activity	The following tables summarize the Company’s notes activity for the years ended December 31, 2019 and 2018, respectively (amounts in thousands): Notes, net as of December 31, 2018 Proceeds Lump sum payoffs Realized/unrealized (gain) loss on derivative instruments Amortization of premiums/ discounts Amortization of deferred financing costs, net (1) Notes, net as of December 31, 2019 Fixed Rate Debt: Unsecured – Public $ 5,485,884 $ 1,194,468 (2) $ (600,000 ) $ — $ 3,117 $ (5,956 ) $ 6,077,513 Floating Rate Debt: Unsecured – Public 447,402 — (450,000 ) 2,277 45 276 — Total $ 5,933,286 $ 1,194,468 $ (1,050,000 ) $ 2,277 $ 3,162 $ (5,680 ) $ 6,077,513 (1) Represents amortization of deferred financing costs, net of debt financing costs. (2 ) Issued $600.0 million of ten-year 3.00% unsecured notes, receiving net proceeds of approximately $597.5 million before underwriting fees, hedge termination costs and other expenses. Additionally, issued $600.0 million of ten-year 2.50% unsecured notes, receiving net proceeds of approximately $597.0 million before underwriting fees and other expenses. Notes, net as of December 31, 2017 Proceeds Realized/unrealized (gain) loss on derivative instruments Amortization of premiums/ discounts Amortization of deferred financing costs, net (1) Notes, net as of December 31, 2018 Fixed Rate Debt: Unsecured – Public $ 4,591,373 $ 896,294 (2) $ — $ 2,547 $ (4,330 ) $ 5,485,884 Floating Rate Debt: Unsecured – Public (3) 447,439 — (680 ) 90 553 447,402 Total $ 5,038,812 $ 896,294 $ (680 ) $ 2,637 $ (3,777 ) $ 5,933,286 (1) Represents amortization of deferred financing costs, net of debt financing costs. (2 ) 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. Additionally, 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. (3 ) Fair value interest rate swaps converted 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 Debt Extinguishment Costs on Notes Recorded as Additional Interest Expense	The following table summarizes the Company’s debt extinguishment costs on notes recorded as additional interest expense during the years ended December 31, 2019 and 2018, respectively (amounts in thousands): Description 2019 2018 Prepayment premiums/penalties $ 10,266 $ — Write-offs of unamortized deferred financing costs 287 — Write-offs of unamortized (premiums)/discounts/OCI 1,043 — Total $ 11,596 $ —
Schedule of Unsecured Revolving Credit Facility	The following table presents the availability on the Company’s unsecured revolving credit facility as of December 31, 2019 and 2018 (amounts in thousands): December 31, 2019 December 31, 2018 Unsecured revolving credit facility commitment $ 2,500,000 $ 2,000,000 Commercial paper balance outstanding (1,000,000 ) (500,000 ) Unsecured revolving credit facility balance outstanding (20,000 ) — Other restricted amounts (100,929 ) (103,622 ) Unsecured revolving credit facility availability $ 1,379,071 $ 1,396,378
Summary of Debt Extinguishment Costs on Line of Credit Recorded as Additional Interest Expense	The following table summarizes the Company’s debt extinguishment costs on the line of credit recorded as additional interest expense during the years ended December 31, 2019 and 2018, respectively (amounts in thousands): Description 2019 2018 Write-offs of unamortized deferred financing costs $ 588 $ — Total $ 588 $ —
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, 2019 (amounts in thousands): Year Total 2020 (1) $ 1,027,542 2021 926,404 2022 271,835 2023 1,329,088 2024 26,100 Thereafter 5,550,010 Subtotal 9,130,979 Deferred Financing Costs and Unamortized (Discount) (94,023 ) Total $ 9,036,956 (1) Includes $1.0 billion in principal outstanding on the Company’s commercial paper program.
Mortgages [Member]
Debt Instrument [Line Items]
Summary of Certain Interest Rate and Maturity Date Information	The following table summarizes certain interest rate and maturity date information as of and for the years ended December 31, 2019 and 2018 , respectively: December 31, 2019 December 31, 2018 Interest Rate Ranges 0.10% - 5.29% 0.10% - 6.90% Weighted Average Interest Rate 3.84% 4.15% Maturity Date Ranges 2020-2061 2019-2061
Notes [Member]
Debt Instrument [Line Items]
Summary of Certain Interest Rate and Maturity Date Information	The following table summarizes certain interest rate and maturity date information as of and for the years ended December 31, 2019 and 2018, respectively: December 31, 2019 December 31, 2018 Interest Rate Ranges 2.50% - 7.57% 2.85% - 7.57% Weighted Average Interest Rate 4.21% 4.25% Maturity Date Ranges 2021-2047 2019-2047

Derivative and Other Fair Val_2

Derivative and Other Fair Value Instruments (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 , respectively (amounts in thousands): December 31, 2019 December 31, 2018 Carrying Value Estimated Fair Value (Level 2) Carrying Value Estimated Fair Value (Level 2) Mortgage notes payable, net $ 1,941,610 $ 1,930,710 $ 2,385,470 $ 2,352,502 Unsecured debt, net 7,095,346 7,677,289 6,432,469 6,481,426 Total debt, net $ 9,036,956 $ 9,607,999 $ 8,817,939 $ 8,833,928
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, 2019 and 2018, respectively (amounts in thousands): Fair Value Measurements at Reporting Date Using Description Balance Sheet Location 12/31/2019 Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Supplemental Executive Retirement Plan Other Assets $ 151,889 $ 151,889 $ — $ — Liabilities Supplemental Executive Retirement Plan Other Liabilities $ 151,889 $ 151,889 $ — $ — Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Mezzanine $ 463,400 $ — $ 463,400 $ — 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 $ —
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, 2019, 2018 and 2017, respectively (amounts in thousands): December 31, 2019 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 $ 2,277 Fixed rate debt Interest expense $ (2,277 ) Total $ 2,277 $ (2,277 ) 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
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, 2019, 2018 and 2017, respectively (amounts in thousands): Effective Portion December 31, 2019 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 Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps $ (33,765 ) Interest expense $ (21,188 ) Total $ (33,765 ) $ (21,188 ) 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 ) N/A $ — 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 ) N/A $ — Total $ 6,439 $ (18,858 ) $ —

Earnings Per Share and Earnin_2

Earnings Per Share and Earnings Per Unit (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 2017 Numerator for net income per share – basic: Net income $ 1,009,708 $ 685,192 $ 628,381 Allocation to Noncontrolling Interests – Operating Partnership (36,034 ) (24,939 ) (22,604 ) Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (3,297 ) (2,718 ) (2,323 ) Preferred distributions (3,090 ) (3,090 ) (3,091 ) Numerator for net income per share – basic $ 967,287 $ 654,445 $ 600,363 Numerator for net income per share – diluted: Net income $ 1,009,708 $ 685,192 $ 628,381 Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (3,297 ) (2,718 ) (2,323 ) Preferred distributions (3,090 ) (3,090 ) (3,091 ) Numerator for net income per share – diluted $ 1,003,321 $ 679,384 $ 622,967 Denominator for net income per share – basic and diluted: Denominator for net income per share – basic 370,461 368,052 366,968 Effect of dilutive securities: OP Units 12,907 12,869 12,901 Long-term compensation shares/units 2,965 2,774 2,809 Denominator for net income per share – diluted 386,333 383,695 382,678 Net income per share – basic $ 2.61 $ 1.78 $ 1.64 Net income per share – diluted $ 2.60 $ 1.77 $ 1.63
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, 2019 2018 2017 Numerator for net income per Unit – basic and diluted: Net income $ 1,009,708 $ 685,192 $ 628,381 Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (3,297 ) (2,718 ) (2,323 ) Allocation to Preference Units (3,090 ) (3,090 ) (3,091 ) Numerator for net income per Unit – basic and diluted $ 1,003,321 $ 679,384 $ 622,967 Denominator for net income per Unit – basic and diluted: Denominator for net income per Unit – basic 383,368 380,921 379,869 Effect of dilutive securities: Dilution for Units issuable upon assumed exercise/vesting of the Company’s long-term compensation shares/units 2,965 2,774 2,809 Denominator for net income per Unit – diluted 386,333 383,695 382,678 Net income per Unit – basic $ 2.61 $ 1.78 $ 1.64 Net income per Unit – diluted $ 2.60 $ 1.77 $ 1.63

Share Incentive Plans (Tables)

Share Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2019
Share Based Compensation [Abstract]
Summary of Terms of Awards Generally Granted to Employees	The following table summarizes the terms of Awards generally granted to employees: Options Restricted Shares Restricted Units Overview Options exercised after vesting result in issuance of new Common Shares. Restricted shareholders generally have the same voting rights and receive quarterly dividend payments on their shares at the same rate and on the same date as any other Common Share holder (1). When certain conditions are met, restricted units convert into an equal number of OP Units, which the holder may exchange for Common Shares on a one-for-one basis or at the option of the Company the cash value of such shares. Restricted unitholders receive quarterly distribution payments on their restricted units at the same rate and on the same date as any other OP Unit holder (1). Grant/Exercise Price Granted at the fair market value of Common Shares as of the grant date. Granted at the fair market value of Common Shares as of the grant date. Granted at varying discount rates to the fair market value of Common Shares as of the grant date (2). Vesting Period In three equal installments over a three-year period from the grant date. Three years from the grant date. Three years from the grant date. Expiration Ten years from the grant date. Not applicable. Ten years from the grant date (2). Upon Employee Termination Unvested options are canceled. Unvested restricted shares are canceled. Unvested restricted units are canceled. (1) Dividends/distributions paid on unvested restricted shares and units are included as a component of retained earnings and Noncontrolling Interest – Operating Partnership/Limited Partners Capital, respectively, 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. (2) A restricted unit will automatically convert to an OP Unit when the capital account of each restricted unit increases (“books-up”) to a specified target. The probability of a book-up occurring within the ten-year contractual life along with the liquidity risk associated with various hold period restrictions are both reflected in the discount. If the capital target is not attained within ten years following the date of issuance, the restricted unit will automatically be canceled and no compensation will be payable to the holder of such canceled restricted unit. If the capital target is attained and the restricted unit is converted to an OP Unit, it will not expire.
Summary of Terms of Each Retirement Eligibility Category	The following table summarizes the terms of each retirement eligibility category. Age 62 for Employees Rule of 70 for Employees Age 72 for Trustees Eligibility For employees hired prior to January 1, 2009 and who were age 59 or older as of February 1, 2019. All employees (1). All non-employee Trustees. Effect on unvested restricted shares, restricted units and Options Awards immediately vest and Options continue to be exercisable for the balance of the applicable ten-year option period. Awards continue to vest per the original vesting schedule, subject to certain conditions, and Options continue to be exercisable for the balance of the applicable ten-year option period. Awards immediately vest and Options continue to be exercisable for the balance of the applicable ten-year option period. Effect on LTI Plan Awards are prorated in proportion to the number of days worked in the first year of the three-year performance period and the individual does not receive any payout of shares or units until the final payout is determined at the end of the three-year performance period. (1) 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 six months’ advance written notice of his or her intention to retire along with agreeing to certain other conditions.
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, Options and Employee Share Purchase Plan (“ESPP”) for the three Year Ended December 31, 2019 Compensation Expense Compensation Capitalized Restricted Units/Options In-Lieu of Bonus (1) Compensation Equity Dividends Incurred Restricted shares (2) $ 11,522 $ 916 $ — $ 12,438 $ 979 Restricted units (2) 9,905 240 3,265 13,410 825 Options 2,420 254 1 2,675 — ESPP discount 602 40 — 642 — Total $ 24,449 $ 1,450 $ 3,266 $ 29,165 $ 1,804 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 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 Options 4,893 323 1,619 6,835 — ESPP discount 681 66 — 747 — Total $ 24,997 $ 1,076 $ 1,809 $ 27,882 $ 1,502 (1) The Company allows eligible officers the ability to receive immediately vested restricted units (subject to the book-up provisions described above and a two-year hold restriction) or immediately vested 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 tables below summarize the Award activity of the Share Incentive Plans for the three years ended December 31, 2019, 2018 and 2017 : 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, 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 Awards granted (1) (5) 234,147 $ 72.10 163,799 $ 73.96 141,772 $ 67.22 Awards exercised/vested (2) (3) (4) (1,745,050 ) $ 44.72 (151,321 ) $ 75.41 (422,784 ) $ 70.77 Awards forfeited (30,489 ) $ 61.92 (5,197 ) $ 65.35 (552 ) $ 69.43 Awards expired (3,299 ) $ 40.39 — — — — Balance at December 31, 2019 5,567,544 $ 55.52 306,706 $ 66.15 858,284 $ 64.95 (1) The weighted average grant date fair value for Options granted during the years ended December 31, 2019, 2018 and 2017 was $8.05 per share, $6.17 per share and $5.86 per share, respectively. (2) The aggregate intrinsic value of Options exercised during the years ended December 31, 2019, 2018 and 2017 was $58.1 million, $42.9 million and $25.6 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, 2019, 2018 and 2017 was $11.1 million, $11.5 million and $10.2 million, respectively. (4) The fair value of restricted units vested during the years ended December 31, 2019, 2018 and 2017 was $29.1 million, $1.8 million and $11.7 million, respectively. (5) Includes LTI plan awards granted under the executive compensation program.
Information Regarding Options Outstanding and Exercisable	The following table summarizes information regarding Options outstanding and exercisable at December 31, 2019 (aggregate intrinsic value is in thousands): Options Weighted Average Remaining Contractual Life in Years Weighted Average Exercise Price Aggregate Intrinsic Value (1) Options Outstanding 5,567,544 5.30 $ 55.52 $ 141,395 Options Exercisable 4,750,481 4.81 $ 54.13 $ 127,277 Vested and expected to vest 808,646 8.13 $ 63.60 $ 14,005 (1) The aggregate intrinsic values were calculated as the excess, if any, between the Company’s closing share price of $80.92 per share on December 31, 2019 and the strike price of the underlying awards.

Employee Plans (Tables)

Employee Plans (Tables)	12 Months Ended
	Dec. 31, 2019
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 with the net proceeds noted below being contributed to ERPOP in exchange for OP Units (amounts in thousands except share and per share amounts): Year Ended December 31, 2019 2018 2017 Shares issued 48,131 75,414 68,286 Issuance price ranges $59.56 – $72.91 $47.80 – $57.09 $52.79 – $58.06 Issuance proceeds $3,116 $3,879 $3,744

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Schedule of Contractual Obligations	The following table summarizes the Company’s contractual obligations for deferred compensation for the next five years and thereafter as of December 31, 2019: (Payments)/Receipts Due by Year (in thousands) 2020 2021 2022 2023 2024 Thereafter Total Other Long-Term Liabilities: Deferred Compensation (1) $ (761 ) $ (1,116 ) $ (1,116 ) $ (991 ) $ (709 ) $ (3,897 ) $ (8,590 ) (1) Estimated payments to the Company’s Chairman and one former executive officer based on actual and estimated retirement dates.

Reportable Segments (Tables)

Reportable Segments (Tables)	12 Months Ended
	Dec. 31, 2019
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 for the years ended December 31, 2019, 2018 and 2017, respectively (amounts in thousands): Year Ended December 31, 2019 2018 2017 Rental income $ 2,700,691 $ 2,577,681 $ 2,470,689 Property and maintenance expense (446,845 ) (429,335 ) (405,281 ) Real estate taxes and insurance expense (366,139 ) (357,814 ) (335,495 ) Total operating expenses (812,984 ) (787,149 ) (740,776 ) Net operating income $ 1,887,707 $ 1,790,532 $ 1,729,913
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 for the years ended December 31, 2019, 2018 and 2017 , respectively, as well as total assets and capital expenditures at December 31, 2019 and 2018 , respectively (amounts in thousands): Year Ended December 31, 2019 Year Ended December 31, 2018 Year Ended December 31, 2017 Rental Income Operating Expenses NOI Rental Income Operating Expenses NOI Rental Income Operating Expenses NOI Same store (1) Los Angeles $ 468,517 $ 136,096 $ 332,421 $ 451,592 $ 129,455 $ 322,137 $ 402,192 $ 114,055 $ 288,137 Orange County 105,087 24,407 80,680 101,198 24,468 76,730 88,527 21,544 66,983 San Diego 95,042 24,636 70,406 91,971 24,024 67,947 88,507 23,073 65,434 Subtotal - Southern California 668,646 185,139 483,507 644,761 177,947 466,814 579,226 158,672 420,554 San Francisco 480,499 116,036 364,463 463,492 112,331 351,161 430,501 108,689 321,812 Washington D.C. 413,006 125,688 287,318 403,761 123,345 280,416 430,060 129,720 300,340 New York 454,448 188,784 265,664 444,112 178,055 266,057 454,945 170,064 284,881 Boston 227,547 62,176 165,371 218,778 60,409 158,369 223,595 60,931 162,664 Seattle 207,019 56,016 151,003 200,222 55,871 144,351 191,074 52,470 138,604 Other Markets 2,094 714 1,380 1,940 658 1,282 1,839 652 1,187 Total same store 2,453,259 734,553 1,718,706 2,377,066 708,616 1,668,450 2,311,240 681,198 1,630,042 Non-same store/other (2) (3) Non-same store 196,476 62,591 133,885 103,688 36,874 66,814 95,016 30,742 64,274 Other (3) 50,956 15,840 35,116 96,927 41,659 55,268 64,433 28,836 35,597 Total non-same store/other 247,432 78,431 169,001 200,615 78,533 122,082 159,449 59,578 99,871 Totals $ 2,700,691 $ 812,984 $ 1,887,707 $ 2,577,681 $ 787,149 $ 1,790,532 $ 2,470,689 $ 740,776 $ 1,729,913 (1) For the years ended December 31, 2019 and 2018, same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2018, less properties subsequently sold, which represented 71,830 apartment units. For the year ended December 31, 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. (2) For the years ended December 31, 2019 and 2018, non-same store primarily includes properties acquired after January 1, 2018, plus any properties in lease-up and not stabilized as of January 1, 2018. For the year ended December 31, 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. (3) Other includes development, other corporate operations and operations prior to disposition for properties sold. Year Ended December 31, 2019 Year Ended December 31, 2018 Total Assets Capital Expenditures Total Assets Capital Expenditures Same store (1) Los Angeles $ 2,975,420 $ 31,738 $ 2,958,361 $ 28,574 Orange County 404,545 9,276 418,041 8,214 San Diego 389,537 4,464 405,449 4,525 Subtotal - Southern California 3,769,502 45,478 3,781,851 41,313 San Francisco 3,238,884 28,153 3,325,595 42,497 Washington D.C. 3,370,750 23,015 3,484,045 26,981 New York 3,866,500 25,132 3,878,580 23,126 Boston 1,464,196 23,823 1,514,814 24,000 Seattle 1,292,609 19,990 1,330,959 18,065 Other Markets 12,931 194 12,781 163 Total same store 17,015,372 165,785 17,328,625 176,145 Non-same store/other (2) (3) Non-same store 3,447,497 10,788 1,990,102 5,934 Other (3) 709,900 1,850 1,075,482 6,422 Total non-same store/other 4,157,397 12,638 3,065,584 12,356 Totals $ 21,172,769 $ 178,423 $ 20,394,209 $ 188,501 (1) Same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2018, less properties subsequently sold, which represented 71,830 apartment units. (2) Non-same store primarily includes properties acquired after January 1, 2018, plus any properties in lease-up and not stabilized as of January 1, 2018. (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, 2019
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 2019 (1) 3/31 6/30 9/30 12/31 Total revenues $ 662,494 $ 669,517 $ 685,145 $ 683,919 Operating income 209,969 369,260 368,363 408,952 Net income * 109,257 321,299 277,846 301,306 Net income available to Common Shares 103,766 308,196 266,333 288,992 Earnings per share: Net income available to Common Shares - basic $ 0.28 $ 0.83 $ 0.72 $ 0.78 Net income available to Common Shares - diluted $ 0.28 $ 0.83 $ 0.71 $ 0.77 First Quarter Second Quarter Third Quarter Fourth Quarter 2018 (1) 3/31 6/30 9/30 12/31 Total revenues $ 633,016 $ 639,808 $ 652,867 $ 652,743 Operating income 339,082 217,603 339,403 219,282 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: Net income available to Common Shares - basic $ 0.57 $ 0.31 $ 0.58 $ 0.32 Net income available to Common Shares - diluted $ 0.57 $ 0.31 $ 0.58 $ 0.31 * The Company did not have any discontinued operations, extraordinary items or cumulative effect of change in accounting principle during the periods presented. 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. (1) Amounts may not equal full year results due to rounding.
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 2019 (1) 3/31 6/30 9/30 12/31 Total revenues $ 662,494 $ 669,517 $ 685,145 $ 683,919 Operating income 209,969 369,260 368,363 408,952 Net income * 109,257 321,299 277,846 301,306 Net income available to Units 107,685 319,706 276,243 299,687 Earnings per Unit: Net income available to Units - basic $ 0.28 $ 0.83 $ 0.72 $ 0.78 Net income available to Units - diluted $ 0.28 $ 0.83 $ 0.71 $ 0.77 First Quarter Second Quarter Third Quarter Fourth Quarter 2018 (1) 3/31 6/30 9/30 12/31 Total revenues $ 633,016 $ 639,808 $ 652,867 $ 652,743 Operating income 339,082 217,603 339,403 219,282 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: Net income available to Units - basic $ 0.57 $ 0.31 $ 0.58 $ 0.32 Net income available to Units - diluted $ 0.57 $ 0.31 $ 0.58 $ 0.31 * The Operating Partnership did not have any discontinued operations, extraordinary items or cumulative effect of change in accounting principle during the periods presented. 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. (1) Amounts may not equal full year results due to rounding.

Business - Additional Informati

Business - Additional Information (Details)	Dec. 31, 2019StatePropertyApartmentUnit
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Number of states in which entity operates | State	10
Properties | Property	309
Apartment units | ApartmentUnit	79,962
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, 2019PropertyApartmentUnit
Property/Unit schedule
Properties | Property	309
Apartment Units | ApartmentUnit	79,962
Wholly Owned Properties
Property/Unit schedule
Properties | Property	291
Apartment Units | ApartmentUnit	76,265
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

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019USD ($)PropertyApartmentUnit$ / shares	Dec. 31, 2018USD ($)$ / shares	Dec. 31, 2017USD ($)$ / shares	Jan. 01, 2019USD ($)
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	$ 14,200,000	$ 13,200,000	$ 14,700,000
Lessee, finance lease, description	The Company is a lessor for its residential and retail leases and is a lessee for its corporate headquarters and regional offices and ground leases for land underlying current operating properties or projects under development.  If applicable, lease agreements must be evaluated to determine the accounting treatment as a finance or operating lease in accordance with the new leasing standard.  A lease is classified as a finance lease if it meets any of the following criteria:  (a) Ownership of the underlying asset is transferred to the lessee by the end of the lease term; (b) the lessee has and is reasonably certain to exercise an option to purchase the underlying asset; (c) the lease term is for the major part of the remaining economic life of the underlying asset; (d) the present value of future minimum lease payments is equal to substantially all of the fair value of the underlying asset; and (e) the underlying asset is expected to have no alternative use to the lessor at the end of the lease term due to its specialized nature.
Lessee, finance lease residual value guarantee, description	the present value of future minimum lease payments is equal to substantially all of the fair value of the underlying asset
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.01	$ 0.01	$ 0.01
Land and depreciable property net	$ 13,700,000,000	$ 14,000,000,000
Right-of-use assets	512,774,000			$ 434,201,000
Lease liabilities	$ 331,334,000			$ 278,287,000
Properties | Property	309
Noncontrolling Interests – Partially Owned Properties	$ 1,183,000	$ (2,293,000)
Apartment units | ApartmentUnit	79,962
Partially Owned Properties – Consolidated
Properties | Property	17
Noncontrolling Interests – Partially Owned Properties	$ 1,200,000
Apartment units | ApartmentUnit	3,535
Limited Life Partnership Properties [Member]
Properties | Property	4
Noncontrolling Interests – Partially Owned Properties	$ 10,200,000
Noncontrolling interests settlement value	$ 78,900,000
Minimum [Member] | Retail Commercial Leases [Member]
Retail leases term	5 years
Maximum [Member] | Retail Commercial Leases [Member]
Retail leases term	10 years
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
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 - Schedule of Rental Income Detail by Leasing and Revenue Recognition Standards Along with Percentages of Rental Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leasing standard	$ 2,608,103
Percentage of rental income	100.00%	100.00%
Rental income	$ 2,700,691	$ 2,577,681	$ 2,470,689
Percentage of rental income	100.00%	100.00%
Residential and Retail Rent [Member]
Leasing standard	$ 2,486,189
Utility Recoveries ("RUBS") [Member]
Leasing standard	68,576
Storage Rent [Member]
Leasing standard	3,816
Pet Rent [Member]
Leasing standard	11,617
Accounting Standards Update 2016-02 [Member]
Leasing standard	$ 2,608,103	$ 2,481,386
Percentage of rental income	96.60%	96.30%
Percentage of rental income	96.60%	96.30%
Accounting Standards Update 2016-02 [Member] | Residential and Retail Rent [Member]
Leasing standard	$ 2,486,189	$ 2,369,552
Accounting Standards Update 2016-02 [Member] | Utility Recoveries ("RUBS") [Member]
Leasing standard	68,576	63,218
Accounting Standards Update 2016-02 [Member] | Parking Rent [Member]
Leasing standard	37,905	33,757
Accounting Standards Update 2016-02 [Member] | Storage Rent [Member]
Leasing standard	3,816	3,674
Accounting Standards Update 2016-02 [Member] | Pet Rent [Member]
Leasing standard	$ 11,617	$ 11,185
Accounting Standards Update 2014-09 [Member]
Percentage of rental income	3.40%	3.70%
Rental income	$ 92,588	$ 96,295
Percentage of rental income	3.40%	3.70%
Accounting Standards Update 2014-09 [Member] | Parking Revenue [Member]
Rental income	$ 28,272	$ 26,743
Accounting Standards Update 2014-09 [Member] | Other Revenue [Member]
Rental income	$ 64,316	$ 69,552

Summary of Significant Accoun_6

Summary of Significant Accounting Policies Compensation (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary Of Significant Accounting Policies [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	16.30%	14.80%	15.30%
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	3.10%	3.09%	3.08%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.43%	2.52%	1.93%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 8.06	$ 6.15	$ 5.86

Summary of Significant Accoun_7

Summary of Significant Accounting Policies Compensation (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2019
Summary Of Significant Accounting Policies [Abstract]
Historical period to estimate volatility	5 years

Summary of Significant Accoun_8

Summary of Significant Accounting Policies Tax (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary Of Significant Accounting Policies [Abstract]
State and local income, franchise and excise tax (benefit)	$ 963	$ 878	$ 478
Alternative minimum tax credit (benefit)	(3,244)
Income and other tax expense (benefit)	$ (2,281)	$ 878	$ 478
Tax Treatment Of Dividends And Distributions Ordinary Dividends	$ 1.39604	$ 1.84454	$ 1.22126
Tax Treatment Of Dividends And Distributions Long Term Capital Gain	0.61243	0.21423	0.18959
Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain	0.23403	0.06498	0.10040
Dividends and distributions declared per Common Share outstanding	$ 2.24250	$ 2.12375	$ 1.51125

Summary of Significant Accoun_9

Summary of Significant Accounting Policies Tax (Parenthetical) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Summary Of Significant Accounting Policies Tax Parenthetical Details [Abstract]
Income tax refund claims or receives	$ 1.6
Term to refund carryover amount	4 years
Refund percentage available in first year	50.00%
Remaining Tax Carryover Amount	$ 1.6
Expected alternative minimum tax benefit	$ 3.2
Dividend payable common share/unit, per share	$ 0.5675	$ 0.54	$ 0.50375

Summary of Significant Accou_10

Summary of Significant Accounting Policies - Schedule of Computation of Initial Right-of-use Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Leases [Line Items]
Lease liabilities	$ 331,334	$ 278,287
Reclassifications:
Right-of-use assets	$ 512,774	434,201
Other Assets [Member]
Reclassifications:
Prepaid ground leases		17,886
Ground lease intangibles – below market, net		166,230
Other Liabilities [Member]
Reclassifications:
Ground lease intangibles – above market, net		(2,110)
Straight-line rent liabilities		$ (26,092)

Equity, Capital and Other Int_3

Equity, Capital and Other Interests - Changes in the Company 's Issued and Outstanding Common Shares and Units (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity Capital And Other Interests [Abstract]
Common Stock, Shares, Outstanding	369,405,161	368,018,082	365,870,924
Common Shares Issued:
Conversion of OP Units	313,940	131,477	1,149,284
Exercise of share options	1,745,050	1,056,388	846,137
Employee Share Purchase Plan (ESPP)	48,131	75,414	68,286
Restricted share grants, net	158,602	123,800	83,451
Common Stock, Shares, Outstanding	371,670,884	369,405,161	368,018,082
Units
Total Units Outstanding	13,904,035	13,768,438	14,626,075
Restricted unit grants, net	141,220	267,074	291,647
Conversion of OP Units to Common Shares	(313,940)	(131,477)	(1,149,284)
Total Units Outstanding	13,731,315	13,904,035	13,768,438
Common Shares And Units Outstanding	385,402,199	383,309,196	381,786,520
Units Ownership Interest in Operating Partnership	3.60%	3.60%	3.60%

Equity, Capital and Other Int_4

Equity, Capital and Other Interests - Changes in Operating Partnership's Issued and Outstanding General Partner Units and Limited Partner Units (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
General and Limited Partner Units
Common Shares And Units Outstanding	383,309,196	381,786,520
Exercise of share options	1,745,050	1,056,388	846,137
Employee Share Purchase Plan (ESPP)	48,131	75,414	68,286
Restricted share grants, net	158,602	123,800	83,451
Restricted unit grants, net	141,220	267,074	291,647
Common Shares And Units Outstanding	385,402,199	383,309,196	381,786,520
Limited Partner Units
Total Units Outstanding	13,904,035	13,768,438	14,626,075
Restricted unit grants, net	141,220	267,074	291,647
Conversion of Limited Partner OP Units to EQR Common Shares	(313,940)	(131,477)	(1,149,284)
Total Units Outstanding	13,731,315	13,904,035	13,768,438
Units Ownership Interest in Operating Partnership	3.60%	3.60%	3.60%
ERPOP [Member]
General and Limited Partner Units
Common Shares And Units Outstanding	383,309,196	381,786,520	380,496,999
Exercise of share options	1,745,050	1,056,388	846,137
Employee Share Purchase Plan (ESPP)	48,131	75,414	68,286
Restricted share grants, net	158,602	123,800	83,451
Restricted unit grants, net	141,220	267,074	291,647
Common Shares And Units Outstanding	385,402,199	383,309,196	381,786,520
Limited Partner Units
Total Units Outstanding	13,904,035	13,768,438	14,626,075
Restricted unit grants, net	141,220	267,074	291,647
Conversion of Limited Partner OP Units to EQR Common Shares	(313,940)	(131,477)	(1,149,284)
Total Units Outstanding	13,731,315	13,904,035	13,768,438
Units Ownership Interest in Operating Partnership	3.60%	3.60%	3.60%

Equity, Capital and Other Int_5

Equity, Capital and Other Interests - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class Of Stock [Line Items]
Redeemable noncontrolling interests - operating partnership	$ 463,400	$ 379,106	$ 366,955	$ 442,092
Redeemable Limited Partners	$ 463,400	$ 379,106	$ 366,955	$ 442,092
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	$ 463,400	$ 379,106

Equity, Capital and Other Int_6

Equity, Capital and Other Interests - Changes in Redemption Value of Redeemable Noncontrolling Interests - Operating Partnership (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity Capital And Other Interests [Abstract]
Redeemable Noncontrolling Interests - Operating Partnership Units	$ 379,106	$ 366,955	$ 442,092
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership	82,283	13,922	(41,916)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	2,011	(1,771)	(33,221)
Redeemable Noncontrolling Interests - Operating Partnership Units	$ 463,400	$ 379,106	$ 366,955

Equity, Capital and Other Int_7

Equity, Capital and Other Interests - Changes in Redemption Value of Redeemable Limited Partners Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity Capital And Other Interests [Abstract]
Redeemable Limited Partners	$ 379,106	$ 366,955	$ 442,092
Limited Partners Change In Redemption Value	82,283	13,922	(41,916)
Limited Partners Change In Carrying Value	2,011	(1,771)	(33,221)
Redeemable Limited Partners	$ 463,400	$ 379,106	$ 366,955

Equity, Capital and Other Int_8

Equity, Capital and Other Interests - Issued and Outstanding Preferred Shares and Preference Units (Details) - ERPOP [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Class Of Stock [Line Items]
8.29% Series K Cumulative Redeemable Preferred Shares/Preference Units; liquidation value $50 per share; 745,600 shares issued and outstanding as of December 31, 2019 and 2018	$ 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 Shares/Preference Units; liquidation value $50 per share; 745,600 shares issued and outstanding as of December 31, 2019 and 2018	$ 37,280	$ 37,280

Equity, Capital and Other Int_9

Equity, Capital and Other Interests - Issued and Outstanding Preferred Shares and Preference Units (Parenthetical) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
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%

Equity, Capital and Other In_10

Equity, Capital and Other Interests - Other - Additional Information (Details)	71 Months Ended	144 Months Ended
	Dec. 31, 2019shares	Dec. 31, 2019shares
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 - Summary of Carryi

Real Estate - Summary of Carrying Amounts of Investment in Real Estate (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Land	$ 5,936,188	$ 5,875,803
Depreciable property:
Buildings and improvements	18,904,686	18,232,625
Furniture, fixtures and equipment	1,916,458	1,722,231
In-Place lease intangibles	497,957	481,045
Projects under development:
Construction-in-progress	181,630	109,409
Land held for development:
Land	96,688	89,909
Construction-in-progress	181,630	109,409
Investment in real estate	27,533,607	26,511,022
Accumulated depreciation	(7,276,786)	(6,696,281)
Investment in real estate, net	20,256,821	19,814,741
Projects under development [Member]
Projects under development:
Land	23,531	25,429
Construction-in-progress	158,099	83,980
Land held for development:
Construction-in-progress	158,099	83,980
Land held for development [Member]
Projects under development:
Construction-in-progress	32,228	28,871
Land held for development:
Land	64,460	61,038
Construction-in-progress	$ 32,228	$ 28,871

Real Estate - Acquired Properti

Real Estate - Acquired Properties From Unaffiliated Parties (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)PropertyApartmentUnit	Dec. 31, 2018USD ($)PropertyApartmentUnit
Properties acquired | Property	13	5
Property Units acquired | ApartmentUnit	3,540	1,478
Purchase Price	$ 1,514,521	$ 707,005
Rental Properties – Consolidated [Member]
Properties acquired | Property	13	5
Property Units acquired | ApartmentUnit	3,540	1,478
Purchase Price	$ 1,494,689	$ 707,005
Land Parcels [Member]
Purchase Price	$ 19,832

Real Estate - Acquired Proper_2

Real Estate - Acquired Properties From Unaffiliated Parties (Parenthetical) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Purchase Price	$ 1,514,521	$ 707,005
Land [Member]
Purchase Price	268,300	113,700
Depreciable Property [Member]
Purchase Price	1,229,000	$ 594,400
Vacant Land [Member]
Purchase Price	16,700
Construction in Progress [Member]
Purchase Price	$ 4,900

Real Estate - Disposed Properti

Real Estate - Disposed Properties to Unaffiliated Parties (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)PropertyApartmentUnit	Dec. 31, 2018USD ($)PropertyApartmentUnit
Properties disposed | Property	13	5
Property Units disposed | ApartmentUnit	3,306	1,292
Sales Price	$ 1,477,275	$ 708,820
Rental Properties – Consolidated [Member]
Properties disposed | Property	11	5
Property Units disposed | ApartmentUnit	2,361	1,292
Sales Price	$ 1,080,675	$ 706,120
Rental Properties – Unconsolidated [Member]
Properties disposed | Property	2
Property Units disposed | ApartmentUnit	945
Sales Price	$ 394,500
Land Parcels [Member]
Sales Price	$ 2,100	$ 2,700

Real Estate - Disposed Proper_2

Real Estate - Disposed Properties to Unaffiliated Parties (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net sales proceeds of unconsolidated rental properties	$ 1,064,619	$ 691,526	$ 384,583
Rental Properties – Unconsolidated [Member]
Ownership percentage	20.00%
Net sales proceeds of unconsolidated rental properties	$ 78,300

Real Estate - Additional Inform

Real Estate - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)Building	Dec. 31, 2017USD ($)
Net gain on sales of real estate properties	$ 447,637	$ 256,810	$ 157,057
Net gain on sales of unconsolidated entities	69,500
Net gain on sales of land parcels	$ 2,044	987	19,167
Non-cash asset impairment charge		$ 702	$ 1,693
San Francisco [Member]
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 (Details) - Subsequent Event [Member] $ in Thousands	Feb. 20, 2020USD ($)PropertyApartmentUnit
Property/Unit schedule
Properties | Property	4
Apartment Units | ApartmentUnit	1,416
Sales Price	$ 778,650
Rental Properties Disposed [Member] | Partially Owned Properties – Consolidated
Property/Unit schedule
Properties | Property	4
Apartment Units | ApartmentUnit	1,416
Sales Price	$ 723,500
Land [Member]
Property/Unit schedule
Sales Price	$ 55,150

Investments in Partially Owne_3

Investments in Partially Owned Entities - Consolidated Variable Interest Entities ("VIEs") - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)PropertyApartmentUnitJointVenture	Dec. 31, 2018USD ($)
Variable Interest Entity [Line Items]
Properties | Property	309
Apartment units | ApartmentUnit	79,962
Number of consolidated joint ventures | JointVenture	2
Total assets	$ 21,172,769	$ 20,394,209
Total liabilities	$ 10,164,843	9,615,454
Consolidated VIE [Member]
Variable Interest Entity [Line Items]
Properties | Property	17
Apartment units | ApartmentUnit	3,535
Total assets	$ 754,700	713,600
Total liabilities	$ 323,100	$ 313,900

Investments in Partially Owne_4

Investments in Partially Owned Entities - Summary of Companys Investment in Unconsolidated Entities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	$ 52,238	$ 58,349
Operating Property [Member] | Unconsolidated Non-VIE [Member]
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities		10,494
Ownership Percentage	20.00%
Real Estate Technology/Other [Member]
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	$ 11,877	5,490
Unconsolidated VIE [Member] | Operating Property [Member]
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	$ 40,361	$ 42,365
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	Dec. 31, 2019ApartmentUnit
Variable Interest Entity [Line Items]
Apartment units		79,962
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, 2019	Dec. 31, 2018	Dec. 31, 2017
Mortgage escrow deposits:
Real estate taxes and insurance		$ 876
Replacement reserves	$ 8,543	8,641
Mortgage principal reserves/sinking funds	9,689	9,754
Other		852
Mortgage escrow deposits	18,232	20,123
Restricted cash:
Tax-deferred (1031) exchange proceeds	14,232
Earnest money on pending acquisitions		5,000
Restricted deposits on real estate investments	658	540
Resident security and utility deposits	37,140	35,659
Other	984	7,549
Restricted cash	53,014	48,748
Restricted deposits	$ 71,246	$ 68,871	$ 50,115

Leases - Additional Information

Leases - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)PropertyCorporateOfficeLease	Dec. 31, 2018	Jan. 01, 2019USD ($)
Operating Leased Assets [Line Items]
Percentage of rental income	100.00%	100.00%
Lease liabilities	$ 331,334		$ 278,287
Right-of-use assets	$ 512,774		$ 434,201
Corporate Office Leases [Member]
Operating Leased Assets [Line Items]
Number of operating leases | CorporateOfficeLease	9
Number of office lease modified | CorporateOfficeLease	4
Lease liabilities	$ 43,105
Right-of-use assets	$ 41,596
Ground Leases [Member]
Operating Leased Assets [Line Items]
Unsecured borrowing rates for actual pricing period used for calculating discount rate	30 years
Lease liabilities	$ 264,990
Right-of-use assets	$ 413,196
Number of operating properties | Property	14
Finance lease, liability	$ 23,239
Finance lease,ROU asset	57,982
Modified Corporate Office leases [Member]
Operating Leased Assets [Line Items]
Lease liabilities	32,100
Right-of-use assets	32,100
Ground Lease Under Development [Member]
Operating Leased Assets [Line Items]
Finance lease, liability	23,200
Finance lease,ROU asset	$ 57,900
Maximum [Member] | Corporate Office Leases [Member]
Operating Leased Assets [Line Items]
Discount rate	3.90%
Remaining lease terms	10 years
Lease expiration dates (inclusive of applicable extension options)	2042
Maximum [Member] | Ground Leases [Member]
Operating Leased Assets [Line Items]
Discount rate	5.50%
Operating lease expiration year	2118
Minimum [Member] | Corporate Office Leases [Member]
Operating Leased Assets [Line Items]
Discount rate	3.30%
Lease expiration dates (inclusive of applicable extension options)	2021
Minimum [Member] | Ground Leases [Member]
Operating Leased Assets [Line Items]
Discount rate	4.40%
Operating lease expiration year	2042
Residential Apartment Leases [Member]
Operating Leased Assets [Line Items]
Percentage of rental income	97.00%
Residential Apartment Leases [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Retail leases term	12 months
Retail Commercial Leases [Member]
Operating Leased Assets [Line Items]
Percentage of rental income	3.00%
Retail Commercial Leases [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Retail leases term	10 years
Retail Commercial Leases [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Retail leases term	5 years

Leases - Summary of Lease Incom

Leases - Summary of Lease Income Types Relating to Lease Payments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Operating Leased Assets [Line Items]
Total lease revenue	$ 2,608,103
Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	2,534,779
Retail Lease [Member]
Operating Leased Assets [Line Items]
Total lease revenue	73,324
Residential and Retail Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	2,486,189
Residential and Retail Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	2,414,201
Residential and Retail Rent [Member] | Retail Lease [Member]
Operating Leased Assets [Line Items]
Total lease revenue	71,988
Utility Recoveries (RUBS Income) [Member]
Operating Leased Assets [Line Items]
Total lease revenue	68,576
Utility Recoveries (RUBS Income) [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	67,659
Utility Recoveries (RUBS Income) [Member] | Retail Lease [Member]
Operating Leased Assets [Line Items]
Total lease revenue	917
Parking Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	37,905
Parking Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	37,557
Parking Rent [Member] | Retail Lease [Member]
Operating Leased Assets [Line Items]
Total lease revenue	348
Storage Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	3,816
Storage Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	3,745
Storage Rent [Member] | Retail Lease [Member]
Operating Leased Assets [Line Items]
Total lease revenue	71
Pet Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	11,617
Pet Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	$ 11,617

Leases - Summary of Lease Inc_2

Leases - Summary of Lease Income Types Relating to Lease Payments (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Leased Assets [Line Items]
Total lease revenue	$ 2,700,691	$ 2,577,681	$ 2,470,689
Other Rental Income [Member]
Operating Leased Assets [Line Items]
Total lease revenue	$ 92,600

Leases - Summary of Right-of-Us

Leases - Summary of Right-of-Use Assets and Related Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Operating Leased Assets [Line Items]
Right-of-use assets	$ 512,774	$ 434,201
Lease liabilities	331,334	$ 278,287
Corporate Office Leases [Member]
Operating Leased Assets [Line Items]
Right-of-use assets	41,596
Lease liabilities	43,105
Ground Leases [Member]
Operating Leased Assets [Line Items]
Right-of-use assets	413,196
Finance lease, right-of-use asset	57,982
Lease liabilities	264,990
Finance lease, liabilities	$ 23,239

Leases - Summary of Ground Leas

Leases - Summary of Ground Lease Intangibles (Details) - Ground Lease [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Operating Leased Assets [Line Items]
Lease intangibles assets	$ 189,518	$ 191,918
Accumulated amortization	(29,861)	(25,688)
Lease intangibles assets net	$ 159,657	166,230
Lease intangibles liabilities		2,400
Accumulated amortization		(290)
Lease intangibles liabilities net		$ 2,110

Leases - Summary of the Effect

Leases - Summary of the Effect of the Amortization for Ground Lease Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property and Maintenance [Member]
Ground lease intangible amortization	$ (4,463)	$ (4,463)	$ (4,369)

Leases - Summary of Aggregate A

Leases - Summary of Aggregate Amortization for Ground Lease Intangibles (Details) - Ground Lease [Member] $ in Thousands	Dec. 31, 2019USD ($)
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)
Finite-lived intangible assets, amortization expense, year 2024	$ (4,463)

Leases - Summary of Quantitativ

Leases - Summary of Quantitative Disclosures for Lessees (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Lease cost:
Interest on lease liabilities (capitalized)	$ 225
Total lease cost	31,549
Cash paid for amounts included in the measurement of lease liabilities:
Investing cash flows from finance leases (capitalized)	34,922
ROU assets obtained in exchange for new finance lease liabilities	$ 23,201
Weighted-average remaining lease term – finance leases	19 years 8 months 12 days
Weighted-average discount rate – finance leases	3.00%
Corporate Office Leases [Member]
Lease cost:
Operating lease cost	$ 3,937
Variable lease cost	1,489
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from Operating leases	5,494
ROU assets obtained in exchange for new operating lease liabilities	$ 44,298
Weighted-average remaining lease term – operating leases	18 years 1 month 6 days
Weighted-average discount rate – operating leases	3.20%
Ground Leases [Member]
Lease cost:
Operating lease cost	$ 22,198
Variable lease cost	3,700
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from Operating leases	16,837
ROU assets obtained in exchange for new operating lease liabilities	$ 422,018
Weighted-average remaining lease term – operating leases	56 years 2 months 12 days
Weighted-average discount rate – operating leases	5.00%

Leases - Summary of Undiscounte

Leases - Summary of Undiscounted Cash Flows for Contractual Obligations for Minimum Rent Payments/Receipts (Details) $ in Thousands	Dec. 31, 2019USD ($)
Leases [Abstract]
2020	$ (567)
2021	(578)
2022	(590)
2023	(601)
2024	(614)
Thereafter	(33,850)
Total	(36,800)
2020	(16,914)
2021	(17,161)
2022	(16,907)
2023	(16,998)
2024	(17,330)
Thereafter	(979,172)
Total	(1,064,482)
2020	64,527
2021	61,817
2022	58,204
2023	50,906
2024	43,784
Thereafter	154,898
Total	$ 434,136

Leases - Summary of Reconciliat

Leases - Summary of Reconciliation of Lease Liabilities (Details) $ in Thousands	Dec. 31, 2019USD ($)
Leases [Abstract]
Total minimum rent payments	$ 1,101,282
Less: Lease discount	769,948
Lease liabilities	$ 331,334

Debt - Mortgage Notes Payable -

Debt - Mortgage Notes Payable - Summary of Mortgage Notes Payable Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	$ 2,385,470	$ 3,618,722
Proceeds	295,771	96,935
Lump sum payoffs	(743,021)	(1,347,939)	$ (493,420)
Scheduled principal repayments	(6,808)	(6,629)
Amortization of premiums/ discounts	8,618	20,144	1,172
Amortization of deferred financing costs, net	1,580	4,237
Mortgage notes payable, net ending balance	1,941,610	2,385,470	3,618,722
Fixed Rate Debt [Member] | Secured – Conventional [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	1,885,407	2,982,344
Proceeds	288,120
Lump sum payoffs	(584,536)	(1,093,705)
Scheduled principal repayments	(6,308)	(6,029)
Amortization of premiums/ discounts	(7,999)	719
Amortization of deferred financing costs, net	15	2,078
Mortgage notes payable, net ending balance	1,574,699	1,885,407	2,982,344
Floating Rate Debt [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	500,063	636,378
Proceeds	7,651	96,935
Lump sum payoffs	(158,485)	(254,234)
Scheduled principal repayments	(500)	(600)
Amortization of premiums/ discounts	16,617	19,425
Amortization of deferred financing costs, net	1,565	2,159
Mortgage notes payable, net ending balance	366,911	500,063	636,378
Floating Rate Debt [Member] | Secured – Conventional [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	6,357	6,948
Proceeds	7,651
Lump sum payoffs	(5,920)
Scheduled principal repayments	(500)	(600)
Amortization of deferred financing costs, net	(538)	9
Mortgage notes payable, net ending balance	7,050	6,357	6,948
Floating Rate Debt [Member] | Secured – Tax Exempt [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	493,706	629,430
Proceeds		96,935
Lump sum payoffs	(152,565)	(254,234)
Amortization of premiums/ discounts	16,617	19,425
Amortization of deferred financing costs, net	2,103	2,150
Mortgage notes payable, net ending balance	$ 359,861	$ 493,706	$ 629,430

Debt - Mortgage Notes Payable_2

Debt - Mortgage Notes Payable - Summary of Mortgage Notes Payable Activity (Parenthetical) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt instrument, maturity date	Nov. 1, 2024
Variable Rate Construction Mortgage [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Jun. 25, 2022
Total commitment amount	$ 67,600,000
New Floating Rate Tax Exempt Mortgage Bond [Member] | ERPOP [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date		Apr. 1, 2042
Fannie Mae Loan Pool [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.94%
Debt instrument, maturity date	Mar. 1, 2029

Debt - Mortgage Notes Payable_3

Debt - Mortgage Notes Payable - Summary of Debt Extinguishment Costs on Mortgages Recorded as Additional Interest Expense (Details) - Mortgages [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Extinguishment Of Debt [Line Items]
Prepayment premiums/penalties	$ 3,381	$ 22,110
Write-offs of unamortized deferred financing costs	2,273	2,957
Write-offs of unamortized (premiums)/discounts/OCI	6,153	16,268
Total	$ 11,807	$ 41,335

Debt - Mortgage Notes Payable_4

Debt - Mortgage Notes Payable - Summary of Certain Interest Rate and Maturity Date Information (Details) - Mortgages [Member]	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.84%	4.15%
Maturity Date Ranges, Start	2020	2019
Maturity Date Ranges, End	2061	2061
Minimum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	0.10%	0.10%
Maximum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	5.29%	6.90%

Debt - Mortgage Notes Payable_5

Debt - Mortgage Notes Payable - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Mortgage notes payable	$ 1,941,610	$ 2,385,470	$ 3,618,722
Historical cost, net of accumulated depreciation, of encumbered properties	2,700,000	3,200,000
Credit Enhanced Debt [Member]
Debt Instrument [Line Items]
Mortgage notes payable	$ 281,700	$ 440,700

Debt - Notes - Summary of Notes

Debt - Notes - Summary of Notes Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Notes, net beginning balance	$ 5,933,286	$ 5,038,812
Proceeds	1,194,468	896,294	$ 692,466
Lump sum payoffs	(1,050,000)		(497,975)
Realized/unrealized (gain) loss on derivative instruments	2,277	(680)	(3,454)
Amortization of premiums/ discounts	3,162	2,637	2,364
Amortization of deferred financing costs, net	(5,680)	(3,777)
Notes, net ending balance	6,077,513	5,933,286	5,038,812
Fixed Rate Debt [Member] | Unsecured – Public [Member]
Debt Instrument [Line Items]
Notes, net beginning balance	5,485,884	4,591,373
Proceeds	1,194,468	896,294
Lump sum payoffs	(600,000)
Amortization of premiums/ discounts	3,117	2,547
Amortization of deferred financing costs, net	(5,956)	(4,330)
Notes, net ending balance	6,077,513	5,485,884	4,591,373
Floating Rate Debt [Member] | Unsecured – Public [Member]
Debt Instrument [Line Items]
Notes, net beginning balance	447,402	447,439
Lump sum payoffs	(450,000)
Realized/unrealized (gain) loss on derivative instruments	2,277	(680)
Amortization of premiums/ discounts	45	90
Amortization of deferred financing costs, net	$ 276	553
Notes, net ending balance		$ 447,402	$ 447,439

Debt - Notes - Summary of Not_2

Debt - Notes - Summary of Notes Activity (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
3.00% Notes [Member]
Debt Instrument [Line Items]
Proceeds from issuance of unsecured debt	$ 600
Debt instrument, interest rate, stated percentage	3.00%
Proceeds from debt, net of issuance costs	$ 597.5
2.50% Notes [Member]
Debt Instrument [Line Items]
Proceeds from issuance of unsecured debt	$ 600
Debt instrument, interest rate, stated percentage	2.50%
Proceeds from debt, net of issuance costs	$ 597
3.50% Notes [Member]
Debt Instrument [Line Items]
Proceeds from issuance of unsecured debt		$ 500
Debt instrument, interest rate, stated percentage		3.50%
Proceeds from debt, net of issuance costs		$ 497
4.15% Notes [Member]
Debt Instrument [Line Items]
Proceeds from issuance of unsecured debt		$ 400
Debt instrument, interest rate, stated percentage		4.15%
Proceeds from debt, net of issuance costs		$ 399.3
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, 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 - Summary of Debt

Debt - Notes - Summary of Debt Extinguishment Costs on Notes Recorded as Additional Interest Expense (Details) - Notes [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Extinguishment Of Debt [Line Items]
Prepayment premiums/penalties	$ 10,266
Write-offs of unamortized deferred financing costs	287
Write-offs of unamortized (premiums)/discounts/OCI	1,043
Total	$ 11,596

Debt - Notes - Summary of Certa

Debt - Notes - Summary of Certain Interest Rate and Maturity Date Information (Details) - Notes [Member]	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.21%	4.25%
Maturity Date Ranges, Start	2021	2019
Maturity Date Ranges, End	2047	2047
Minimum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	2.50%	2.85%
Maximum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	7.57%	7.57%

Debt - Notes - Additional Infor

Debt - Notes - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Shelf registration statement effective date	2019-06
Shelf registration statement expiry date	2022-06

Debt - Line of Credit and Comme

Debt - Line of Credit and Commercial Paper - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Nov. 04, 2019	Nov. 03, 2019	Nov. 01, 2019	Oct. 31, 2019
Line of Credit Facility [Line Items]
Debt instrument, maturity date	Nov. 1, 2024
Commercial paper balance outstanding	$ 1,000,000,000	$ 500,000,000	$ 1,000,000,000	$ 500,000,000
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Weighted average interest rates	2.42%	2.35%
Weighted average amount outstanding	$ 434,400,000	$ 397,300,000
Commercial paper weighted average days outstanding	40 days	22 days
Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Unsecured revolving credit facility	$ 2,500,000,000	$ 2,000,000,000			$ 2,500,000,000	$ 2,000,000,000
Ability to increase LOC facility	$ 750,000,000
Debt instrument, basis spread on variable rate	0.775%
Percentage points of line of credit facility commitment fee	0.125%
Commercial paper balance outstanding	$ 1,000,000,000	$ 500,000,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Weighted average interest rates	3.12%	2.97%

Debt - Line of Credit and Com_2

Debt - Line of Credit and Commercial Paper - Schedule of Unsecured Revolving Credit Facility (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Nov. 04, 2019	Nov. 03, 2019	Nov. 01, 2019	Oct. 31, 2019
Line of Credit Facility [Line Items]
Commercial paper balance outstanding	$ (1,000,000,000)	$ (500,000,000)	$ (1,000,000,000)	$ (500,000,000)
Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Unsecured revolving credit facility	2,500,000,000	2,000,000,000			$ 2,500,000,000	$ 2,000,000,000
Commercial paper balance outstanding	(1,000,000,000)	(500,000,000)
Unsecured revolving credit facility balance outstanding	(20,000,000)
Other restricted amounts	(100,929,000)	(103,622,000)
Unsecured revolving credit facility availability	$ 1,379,071,000	$ 1,396,378,000

Debt - Line of Credit and Com_3

Debt - Line of Credit and Commercial Paper - Summary of Debt Extinguishment Costs on Line of Credit Recorded as Additional Interest Expense (Details) - Line of Credit [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Extinguishment Of Debt [Line Items]
Write-offs of unamortized deferred financing costs	$ 588
Total	$ 588

Debt - Summary of Aggregate Pay

Debt - Summary of Aggregate Payments of Principal on All Debt (Details) $ in Thousands	Dec. 31, 2019USD ($)
Debt Disclosure [Abstract]
2020	$ 1,027,542
2021	926,404
2022	271,835
2023	1,329,088
2024	26,100
Thereafter	5,550,010
Subtotal	9,130,979
Deferred Financing Costs and Unamortized (Discount)	(94,023)
Total	$ 9,036,956

Debt - Summary of Aggregate P_2

Debt - Summary of Aggregate Payments of Principal on All Debt (Parenthetical) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Nov. 04, 2019	Nov. 03, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Commercial paper balance outstanding	$ 1,000	$ 1,000	$ 500	$ 500

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, 2019	Dec. 31, 2018
Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	$ 9,036,956	$ 8,817,939
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	9,607,999	8,833,928
Mortgage Notes Payable, Net [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	1,941,610	2,385,470
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	1,930,710	2,352,502
Unsecured Debt [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	7,095,346	6,432,469
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	$ 7,677,289	$ 6,481,426

Derivative and Other Fair Val_4

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, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Fair Value Of SERP Investments	$ 151,889	$ 134,088
Assets, Fair Value Disclosure		136,088
Liabilities, Fair Value Disclosure		146,216
Other Liabilities, Fair Value Disclosure	151,889	134,088
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	463,400	379,106	$ 366,955	$ 442,092
Forward Starting Swaps [Member]
Derivatives, Fair Value [Line Items]
Forward Starting Swaps		2,000
Forward Starting Swaps		9,851
Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value		2,277
Fair Value, Inputs, Level 1 [Member]
Derivatives, Fair Value [Line Items]
Fair Value Of SERP Investments	151,889	134,088
Assets, Fair Value Disclosure		134,088
Liabilities, Fair Value Disclosure		134,088
Other Liabilities, Fair Value Disclosure	151,889	134,088
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	0	0
Fair Value, Inputs, Level 1 [Member] | Forward Starting Swaps [Member]
Derivatives, Fair Value [Line Items]
Forward Starting Swaps		0
Forward Starting Swaps		0
Fair Value, Inputs, Level 1 [Member] | Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value		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
Liabilities, Fair Value Disclosure		12,128
Other Liabilities, Fair Value Disclosure	0	0
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	463,400	379,106
Fair Value, Inputs, Level 2 [Member] | Forward Starting Swaps [Member]
Derivatives, Fair Value [Line Items]
Forward Starting Swaps		2,000
Forward Starting Swaps		9,851
Fair Value, Inputs, Level 2 [Member] | Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value		2,277
Fair Value, Inputs, Level 3 [Member]
Derivatives, Fair Value [Line Items]
Fair Value Of SERP Investments	0	0
Assets, Fair Value Disclosure		0
Liabilities, Fair Value Disclosure		0
Other Liabilities, Fair Value Disclosure	0	0
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	$ 0	0
Fair Value, Inputs, Level 3 [Member] | Forward Starting Swaps [Member]
Derivatives, Fair Value [Line Items]
Forward Starting Swaps		0
Forward Starting Swaps		0
Fair Value, Inputs, Level 3 [Member] | Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value		$ 0

Derivative and Other Fair Val_5

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, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative	$ 2,277	$ (680)	$ (3,454)
Amount of Gain/(Loss) Recognized in Income on Hedged Item	(2,277)	680	3,454
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative	2,277	(680)	(3,454)
Amount of Gain/(Loss) Recognized in Income on Hedged Item	$ (2,277)	$ 680	$ 3,454

Derivative and Other Fair Val_6

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, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion - Amount of Gain/(Loss) Recognized in OCI on Derivative	$ (33,765)	$ 5,124	$ 6,439
Effective Portion - Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income	(21,188)	(18,452)	(18,858)
Ineffective Portion - Amount of Gain/ (Loss) Reclassified from Accumulated OCI into Income		0	0
Forward Starting Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion - Amount of Gain/(Loss) Recognized in OCI on Derivative	(33,765)	5,124	6,439
Effective Portion - Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income	$ (21,188)	(18,452)	(18,858)
Ineffective Portion - Amount of Gain/ (Loss) Reclassified from Accumulated OCI into Income		$ 0	$ 0

Derivative and Other Fair Val_7

Derivative and Other Fair Value Instruments - Additional Information (Details)	1 Months Ended					12 Months Ended
	Jul. 31, 2019USD ($)DerivativeInstrument	Jun. 30, 2019USD ($)DerivativeInstrument	Nov. 30, 2018USD ($)DerivativeInstrument	Feb. 28, 2018USD ($)DerivativeInstrument	Aug. 31, 2017USD ($)DerivativeInstrument	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Derivative [Line Items]
Unrealized gain (loss) on interest rate cash flow hedges, pretax, accumulated other comprehensive income (loss)						$ 77,600,000	$ 65,000,000
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net						24,900,000
Number of interest rate swaps matured | DerivativeInstrument	6
Repayments of unsecured debt						$ 1,050,000,000		$ 497,975,000
Forward Starting Swaps [Member]
Derivative [Line Items]
Proceeds from settlement of derivative instruments		$ 41,800,000	$ 16,400,000	$ 1,600,000	$ 1,300,000
Forward starting swaps settled | DerivativeInstrument		10	6	2	4
Interest expense		$ 200,000	$ 120,000
Increase (decrease) in charges hedge termination activities		41,600,000	(16,500,000)	$ (1,600,000)	$ (1,300,000)
Total commitment amount		$ 600,000,000	$ 400,000,000	$ 500,000,000	$ 400,000,000
Debt instrument, term		10 years	10 years	10 years	10 years
2.375% Notes [Member]
Derivative [Line Items]
Repayments of unsecured debt	$ 450,000,000
Debt instrument, interest rate, stated percentage	2.375%

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, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 1,009,708	$ 685,192	$ 628,381
Allocation to Noncontrolling Interests – Operating Partnership	(36,034)	(24,939)	(22,604)
Partially Owned Properties	(3,297)	(2,718)	(2,323)
Preferred distributions	(3,090)	(3,090)	(3,091)
Net income available to Common Shares	967,287	654,445	600,363
Numerator for net income per share – diluted	$ 1,003,321	$ 679,384	$ 622,967
Weighted average Common Shares outstanding	370,461	368,052	366,968
OP Units	12,907	12,869	12,901
Dilutive Securities Options	2,965	2,774	2,809
Denominator for net income per share – diluted	386,333	383,695	382,678
Net income per share – basic	$ 2.61	$ 1.78	$ 1.64
Net income per share – diluted	$ 2.60	$ 1.77	$ 1.63

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, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income	$ 1,009,708	$ 685,192	$ 628,381
Partially Owned Properties	$ (3,297)	$ (2,718)	$ (2,323)
Dilutive Securities Options	2,965	2,774	2,809
Denominator for net income per share – diluted	386,333	383,695	382,678
Net income per Unit – basic	$ 2.61	$ 1.78	$ 1.64
Net income per Unit – diluted	$ 2.60	$ 1.77	$ 1.63
ERPOP [Member]
Net income	$ 1,009,708	$ 685,192	$ 628,381
Partially Owned Properties	(3,297)	(2,718)	(2,323)
Allocation to Preference Units	(3,090)	(3,090)	(3,091)
Numerator for net income per Unit – basic and diluted	$ 1,003,321	$ 679,384	$ 622,967
Denominator for net income per Unit – basic	383,368	380,921	379,869
Dilutive Securities Options	2,965	2,774	2,809
Denominator for net income per share – diluted	386,333	383,695	382,678
Net income per Unit – basic	$ 2.61	$ 1.78	$ 1.64
Net income per Unit – diluted	$ 2.60	$ 1.77	$ 1.63

Share Incentive Plans - Additio

Share Incentive Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares available for grant	11,328,266
Individual potential target award minimum	0.00%
Individual potential target award maximum	200.00%
Percentage of distribution 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	$ 8.9
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition	1 year 4 months 6 days
Share-based compensation arrangement by share-based payment award, options, exercisable, number		5,328,020	5,336,043
Share-based compensation arrangement by share-based payment award, options, exercisable, weighted average exercise price		$ 49.57	$ 43.24
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	11,331,958

Share Incentive Plans - Summary

Share Incentive Plans - Summary of Terms of Awards Generally Granted to Employees (Details)	12 Months Ended
	Dec. 31, 2019
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Overview	Options exercised after vesting result in issuance of new Common Shares.
Grant/Exercise Price	Granted at the fair market value of Common Shares as of the grant date.
Vesting Period	3 years
Expiration	10 years
Upon Employee Termination	Unvested options are canceled.
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Overview	Restricted shareholders generally have the same voting rights and receive quarterly dividend payments on their shares at the same rate and on the same date as any other Common Share holder (1).
Grant/Exercise Price	Granted at the fair market value of Common Shares as of the grant date.
Vesting Period	3 years
Upon Employee Termination	Unvested restricted shares are canceled.
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Overview	When certain conditions are met, restricted units convert into an equal number of OP Units, which the holder may exchange for Common Shares on a one-for-one basis or at the option of the Company the cash value of such shares. Restricted unitholders receive quarterly distribution payments on their restricted units at the same rate and on the same date as any other OP Unit holder (1).
Grant/Exercise Price	Granted at varying discount rates to the fair market value of Common Shares as of the grant date (2).
Vesting Period	3 years
Expiration	10 years
Upon Employee Termination	Unvested restricted units are canceled.

Share Incentive Plans - Summa_2

Share Incentive Plans - Summary of Terms of Each Retirement Eligibility Category (Details)	12 Months Ended
	Dec. 31, 2019
Age 62 for Employees [Member]
Defined Benefit Plan Disclosure [Line Items]
Eligibility	For employees hired prior to January 1, 2009 and who were age 59 or older as of February 1, 2019.
Effect on unvested restricted shares, restricted units and Options	Awards immediately vest and Options continue to be exercisable for the balance of the applicable ten-year option period.
Effect on LTI Plan	Awards are prorated in proportion to the number of days worked in the first year of the three-year performance period and the individual does not receive any payout of shares or units until the final payout is determined at the end of the three-year performance period.
Rule of 70 for Employees [Member]
Defined Benefit Plan Disclosure [Line Items]
Eligibility	All employees (1).
Effect on unvested restricted shares, restricted units and Options	Awards continue to vest per the original vesting schedule, subject to certain conditions, and Options continue to be exercisable for the balance of the applicable ten-year option period.
Effect on LTI Plan	Awards are prorated in proportion to the number of days worked in the first year of the three-year performance period and the individual does not receive any payout of shares or units until the final payout is determined at the end of the three-year performance period.
Age 72 for Trustees [Member]
Defined Benefit Plan Disclosure [Line Items]
Eligibility	All non-employee Trustees.
Effect on unvested restricted shares, restricted units and Options	Awards immediately vest and Options continue to be exercisable for the balance of the applicable ten-year option period.
Effect on LTI Plan	Awards are prorated in proportion to the number of days worked in the first year of the three-year performance period and the individual does not receive any payout of shares or units until the final payout is determined at the end of the three-year performance period.

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, 2019	Dec. 31, 2018	Dec. 31, 2017
Compensation information
Compensation Expense	$ 24,449	$ 27,132	$ 24,997
Compensation Capitalized	1,450	1,218	1,076
Restricted Units In-Lieu of Bonus	3,266	4,418	1,809
Compensation Equity	29,165	32,768	27,882
Dividends Incurred	1,804	1,717	1,502
Restricted Shares [Member]
Compensation information
Compensation Expense	11,522	7,406	9,209
Compensation Capitalized	916	852	568
Restricted Units In-Lieu of Bonus	0	0	0
Compensation Equity	12,438	8,258	9,777
Dividends Incurred	979	754	761
Restricted Stock Units (RSUs) [Member]
Compensation information
Compensation Expense	9,905	12,310	10,214
Compensation Capitalized	240	36	119
Restricted Units In-Lieu of Bonus	3,265	1,663	190
Compensation Equity	13,410	14,009	10,523
Dividends Incurred	825	963	741
Options [Member]
Compensation information
Compensation Expense	2,420	6,683	4,893
Compensation Capitalized	254	296	323
Restricted Units In-Lieu of Bonus	1	2,755	1,619
Compensation Equity	2,675	9,734	6,835
Dividends Incurred	0	0	0
Employee Share Purchase Plan Discount [Member]
Compensation information
Compensation Expense	602	733	681
Compensation Capitalized	40	34	66
Restricted Units In-Lieu of Bonus	0	0	0
Compensation Equity	642	767	747
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, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Common Shares Subject to Options, Awards exercised/vested	(1,745,050)	(1,056,388)	(846,137)
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	7,112,235	6,483,832	6,023,101
Common Shares Subject to Options, Awards granted	234,147	1,730,942	1,337,898
Common Shares Subject to Options, Awards exercised/vested	(1,745,050)	(1,056,388)	(846,137)
Common Shares Subject to Options, Awards forfeited	(30,489)	(38,133)	(27,547)
Common Shares Subject to Options, Awards expired	(3,299)	(8,018)	(3,483)
Common Shares Subject to Options, Ending Balance	5,567,544	7,112,235	6,483,832
Weighted Average Exercise Price per Option, Beginning Balance	$ 52.35	$ 46.46	$ 42.05
Weighted Average Exercise Price per Option, Awards granted	72.10	60.40	60.88
Weighted Average Exercise Price per Option, Awards exercised/vested	44.72	29.05	37.26
Weighted Average Exercise Price per Option, Awards forfeited	61.92	60.74	61.85
Weighted Average Exercise Price per Option, Awards expired	40.39	59.70	65.91
Weighted Average Exercise Price per Option, Ending Balance	$ 55.52	$ 52.35	$ 46.46
Restricted Shares [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Restricted Shares, Beginning Balance	299,425	369,741	452,034
Restricted Shares, Awards granted	163,799	129,303	93,867
Restricted Shares, Awards exercised/vested	(151,321)	(194,116)	(165,744)
Restricted Shares, Awards forfeited	(5,197)	(5,503)	(10,416)
Restricted Shares, Awards Expired	0	0	0
Restricted Shares, Ending Balance	306,706	299,425	369,741
Weighted Average Fair Value per Restricted Share, Beginning Balance	$ 66.52	$ 73.67	$ 70.35
Weighted Average Fair Value per Restricted Share, Awards granted	73.96	62.25	61.94
Weighted Average Fair Value per Restricted Share, Awards exercised/vested	75.41	77.32	58.04
Weighted Average Fair Value per Restricted Share, Awards forfeited	65.35	65.77	72.44
Weighted Average Fair Value per Restricted Share, Awards Expired	0	0	0
Weighted Average Fair Value per Restricted Share, Ending Balance	$ 66.15	$ 66.52	$ 73.67
Restricted Units [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Restricted Units, Beginning Balance	1,139,848	901,260	802,257
Restricted Units, Awards Granted	141,772	267,074	291,921
Restricted Units, Awards exercised/vested	(422,784)	(28,486)	(192,644)
Restricted Units, Awards forfeited	(552)	0	(274)
Restricted Units, Awards Expired	0	0	0
Restricted Units, Ending Balance	858,284	1,139,848	901,260
Weighted Average Fair Value per Restricted Unit, Beginning Balance	$ 71.07	$ 77.61	$ 75.26
Weighted Average Fair Value per Restricted Unit, Awards granted	67.22	61.60	68.57
Weighted Average Fair Value per Restricted Unit, Awards exercised/vested	70.77	55.50	54.16
Weighted Average Fair Value per Restricted Unit, Awards forfeited	69.43	0	75.50
Weighted Average Fair Value per Restricted Unit, Awards Expired	0	0	0
Weighted Average Fair Value per Restricted Unit, Ending Balance	$ 64.95	$ 71.07	$ 77.61

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, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Weighted average grant date fair value for Options	$ 8.06	$ 6.15	$ 5.86
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	$ 8.05	$ 6.17	$ 5.86
Intrinsic value of options exercised	$ 58.1	$ 42.9	$ 25.6
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	11.1	11.5	10.2
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	$ 29.1	$ 1.8	$ 11.7

Share Incentive Plans - Informa

Share Incentive Plans - Information Regarding Options Outstanding and Exercisable (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)$ / sharesshares
Share Based Compensation [Abstract]
Options Outstanding, Options | shares	5,567,544
Options Exercisable, Options | shares	4,750,481
Options, Vested and expected to vest | shares	808,646
Options Outstanding, Weighted Average Remaining Contractual Life in Years	5 years 3 months 18 days
Options Exercisable, Weighted Average Remaining Contractual Life in Years	4 years 9 months 21 days
Options Vested and expected to vest, Weighted Average Remaining Contractual Life in Years	8 years 1 month 17 days
Options Outstanding, Weighted Average Exercise Price | $ / shares	$ 55.52
Options Exercisable, Weighted Average Exercise Price | $ / shares	54.13
Vested and expected to vest, Weighted Average Exercise Price | $ / shares	$ 63.60
Options Outstanding, Aggregate Intrinsic Value | $	$ 141,395
Options Exercisable, Aggregate Intrinsic Value | $	127,277
Vested and expected to vest, Aggregate Intrinsic Value | $	$ 14,005

Share Incentive Plans - Infor_2

Share Incentive Plans - Information Regarding Options Outstanding and Exercisable (Parenthetical) (Details)	Dec. 31, 2019$ / shares
Share Based Compensation [Abstract]
Market value of common shares	$ 80.92

Employee Plans - Additional Inf

Employee Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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	2,714,332
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	$ 5,000,000	$ 4,900,000	$ 4,600,000
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, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Service Share Based Compensation Aggregate Disclosures [Abstract]
Shares issued	48,131	75,414	68,286
Issuance price ranges, Minimum	$ 59.56	$ 47.80	$ 52.79
Issuance price ranges, Maximum	$ 72.91	$ 57.09	$ 58.06
Issuance proceeds	$ 3,116	$ 3,879	$ 3,744

Distribution Reinvestment Plan

Distribution Reinvestment Plan - Additional Information (Details) - shares	Dec. 31, 2019	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	4,664,977

Transactions with Related Par_2

Transactions with Related Parties - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transactions [Abstract]
Lease expiration date	Nov. 30, 2032
Lease extension options	two five-year
Amount incurred for leased office space	$ 2.6	$ 2.5	$ 2.8

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)PropertyApartmentUnitAgreement	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Commitments And Contingencies [Abstract]
Projects in various stages of development | Property	2
Partially owned projects in various stages of development | Property	1
Units in various stages of development | ApartmentUnit	824
Consolidated project under development commitment fund | $	$ 421.2
Various stages of development with estimated completion dates ranging through September 30, 2021	Sep. 30, 2021
Number of joint venture agreements | Agreement	2
Compensation expense, recognized | $	$ 0.4	$ 0.3	$ 0.4

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Contractual Obligations (Details) $ in Thousands	Dec. 31, 2019USD ($)
Other Long-Term Liabilities:
Deferred Compensation Due, Year 1	$ (761)
Deferred Compensation Due, Year 2	(1,116)
Deferred Compensation Due, Year 3	(1,116)
Deferred Compensation Due, Year 4	(991)
Deferred Compensation Due, Year 5	(709)
Deferred Compensation Due, Thereafter	(3,897)
Deferred Compensation Due, Total	$ (8,590)

Reportable Segments - Additiona

Reportable Segments - Additional Information (Details) - Customer	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Disclosure Of Entitys Reportable Segments [Abstract]
Number of customer contributed 10% or more of total revenue	0	0	0

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, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Rental income	$ 2,700,691	$ 2,577,681	$ 2,470,689
Property and maintenance expense	(446,845)	(429,335)	(405,281)
Real estate taxes and insurance expense	(366,139)	(357,814)	(335,495)
Operating income	1,356,544	1,115,370	1,004,528
Same Store, Non-same Store and Other
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Rental income	2,700,691	2,577,681	2,470,689
Property and maintenance expense	(446,845)	(429,335)	(405,281)
Real estate taxes and insurance expense	(366,139)	(357,814)	(335,495)
Total operating expenses	(812,984)	(787,149)	(740,776)
Operating income	$ 1,887,707	$ 1,790,532	$ 1,729,913

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, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Rental income	$ 2,700,691	$ 2,577,681	$ 2,470,689
Operating income	1,356,544	1,115,370	1,004,528
Total assets	21,172,769	20,394,209
Capital Expenditures	178,423	188,501
Same Store
Segment Reporting Information [Line Items]
Rental income	2,453,259	2,377,066	2,311,240
Operating expenses	734,553	708,616	681,198
Operating income	1,718,706	1,668,450	1,630,042
Total assets	17,015,372	17,328,625
Capital Expenditures	165,785	176,145
Non-same store/other
Segment Reporting Information [Line Items]
Rental income	247,432	200,615	159,449
Operating expenses	78,431	78,533	59,578
Operating income	169,001	122,082	99,871
Total assets	4,157,397	3,065,584
Capital Expenditures	12,638	12,356
Same Store, Non-same Store and Other
Segment Reporting Information [Line Items]
Rental income	2,700,691	2,577,681	2,470,689
Operating expenses	812,984	787,149	740,776
Operating income	1,887,707	1,790,532	1,729,913
Other markets | Same Store
Segment Reporting Information [Line Items]
Rental income	2,094	1,940	1,839
Operating expenses	714	658	652
Operating income	1,380	1,282	1,187
Total assets	12,931	12,781
Capital Expenditures	194	163
Los Angeles | Same Store
Segment Reporting Information [Line Items]
Rental income	468,517	451,592	402,192
Operating expenses	136,096	129,455	114,055
Operating income	332,421	322,137	288,137
Total assets	2,975,420	2,958,361
Capital Expenditures	31,738	28,574
Subtotal - Southern California | Same Store
Segment Reporting Information [Line Items]
Rental income	668,646	644,761	579,226
Operating expenses	185,139	177,947	158,672
Operating income	483,507	466,814	420,554
Total assets	3,769,502	3,781,851
Capital Expenditures	45,478	41,313
Orange County | Same Store
Segment Reporting Information [Line Items]
Rental income	105,087	101,198	88,527
Operating expenses	24,407	24,468	21,544
Operating income	80,680	76,730	66,983
Total assets	404,545	418,041
Capital Expenditures	9,276	8,214
San Diego | Same Store
Segment Reporting Information [Line Items]
Rental income	95,042	91,971	88,507
Operating expenses	24,636	24,024	23,073
Operating income	70,406	67,947	65,434
Total assets	389,537	405,449
Capital Expenditures	4,464	4,525
Washington DC | Same Store
Segment Reporting Information [Line Items]
Rental income	413,006	403,761	430,060
Operating expenses	125,688	123,345	129,720
Operating income	287,318	280,416	300,340
Total assets	3,370,750	3,484,045
Capital Expenditures	23,015	26,981
New York | Same Store
Segment Reporting Information [Line Items]
Rental income	454,448	444,112	454,945
Operating expenses	188,784	178,055	170,064
Operating income	265,664	266,057	284,881
Total assets	3,866,500	3,878,580
Capital Expenditures	25,132	23,126
San Francisco | Same Store
Segment Reporting Information [Line Items]
Rental income	480,499	463,492	430,501
Operating expenses	116,036	112,331	108,689
Operating income	364,463	351,161	321,812
Total assets	3,238,884	3,325,595
Capital Expenditures	28,153	42,497
Boston | Same Store
Segment Reporting Information [Line Items]
Rental income	227,547	218,778	223,595
Operating expenses	62,176	60,409	60,931
Operating income	165,371	158,369	162,664
Total assets	1,464,196	1,514,814
Capital Expenditures	23,823	24,000
Seattle | Same Store
Segment Reporting Information [Line Items]
Rental income	207,019	200,222	191,074
Operating expenses	56,016	55,871	52,470
Operating income	151,003	144,351	138,604
Total assets	1,292,609	1,330,959
Capital Expenditures	19,990	18,065
Non-same store | Non-same store/other
Segment Reporting Information [Line Items]
Rental income	196,476	103,688	95,016
Operating expenses	62,591	36,874	30,742
Operating income	133,885	66,814	64,274
Total assets	3,447,497	1,990,102
Capital Expenditures	10,788	5,934
Other | Non-same store/other
Segment Reporting Information [Line Items]
Rental income	50,956	96,927	64,433
Operating expenses	15,840	41,659	28,836
Operating income	35,116	55,268	$ 35,597
Total assets	709,900	1,075,482
Capital Expenditures	$ 1,850	$ 6,422

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, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Disclosure Of Entitys Reportable Segments [Abstract]
Units in same store properties	71,830	71,830	71,721

Subsequent Events - Additional

Subsequent Events - Additional Information (Details) - Subsequent Event - Property/Apartment [Member] $ in Millions	Jan. 01, 2020USD ($)PropertyApartmentUnit
Subsequent Event [Line Items]
Number of properties sold | Property	1
Number of self managed apartments | ApartmentUnit	136
Amount of property sold | $	$ 31.2

Quarterly Financial Data (Una_3

Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unaudited Quarterly Financial Data [Line Items]
Total revenues									$ 2,701,075	$ 2,578,434	$ 2,471,406
Operating income									1,356,544	1,115,370	1,004,528
Net income									1,009,708	685,192	628,381
Net income available to Common Shares									$ 967,287	$ 654,445	$ 600,363
Earnings per share:
Net income per share – basic									$ 2.61	$ 1.78	$ 1.64
Net income per share – diluted									$ 2.60	$ 1.77	$ 1.63
ERPOP [Member]
Unaudited Quarterly Financial Data [Line Items]
Total revenues									$ 2,701,075	$ 2,578,434	$ 2,471,406
Operating income									1,356,544	1,115,370	1,004,528
Net income									1,009,708	685,192	628,381
Net income available to Units									$ 1,003,321	$ 679,384	$ 622,967
Earnings per share:
Net income per share – basic									$ 2.61	$ 1.78	$ 1.64
Net income per share – diluted									$ 2.60	$ 1.77	$ 1.63
Scenario, Previously Reported [Member]
Unaudited Quarterly Financial Data [Line Items]
Total revenues	$ 683,919	$ 685,145	$ 669,517	$ 662,494	$ 652,743	$ 652,867	$ 639,808	$ 633,016
Operating income	408,952	368,363	369,260	209,969	219,282	339,403	217,603	339,082
Net income	301,306	277,846	321,299	109,257	122,388	223,846	118,410	220,548
Net income available to Common Shares	$ 288,992	$ 266,333	$ 308,196	$ 103,766	$ 116,415	$ 214,164	$ 112,830	$ 211,036
Earnings per share:
Net income per share – basic	$ 0.78	$ 0.72	$ 0.83	$ 0.28	$ 0.32	$ 0.58	$ 0.31	$ 0.57
Net income per share – diluted	$ 0.77	$ 0.71	$ 0.83	$ 0.28	$ 0.31	$ 0.58	$ 0.31	$ 0.57
Scenario, Previously Reported [Member] | ERPOP [Member]
Unaudited Quarterly Financial Data [Line Items]
Total revenues	$ 683,919	$ 685,145	$ 669,517	$ 662,494	$ 652,743	$ 652,867	$ 639,808	$ 633,016
Operating income	408,952	368,363	369,260	209,969	219,282	339,403	217,603	339,082
Net income	301,306	277,846	321,299	109,257	122,388	223,846	118,410	220,548
Net income available to Units	$ 299,687	$ 276,243	$ 319,706	$ 107,685	$ 120,837	$ 222,323	$ 117,129	$ 219,095
Earnings per share:
Net income per share – basic	$ 0.78	$ 0.72	$ 0.83	$ 0.28	$ 0.32	$ 0.58	$ 0.31	$ 0.57
Net income per share – diluted	$ 0.77	$ 0.71	$ 0.83	$ 0.28	$ 0.31	$ 0.58	$ 0.31	$ 0.57

Schedule III - Real Estate an_2

Schedule III - Real Estate and Accumulated Depreciation-Overall Summary (Details)	Dec. 31, 2019USD ($)PropertyApartmentUnit	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Overall summary of real estate and accumulated depreciation
Investment in Real Estate, Gross	$ 27,533,607,000	$ 26,511,022,000	$ 26,026,896,000	$ 25,386,425,000
Accumulated Depreciation	$ (7,276,786,000)	$ (6,696,281,000)	$ (6,040,378,000)	$ (5,360,389,000)
Investment in Real Estate - Wholly Owned Unencumbered [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	257
Units | ApartmentUnit	68,002
Investment in Real Estate, Gross	$ 23,408,268,350
Accumulated Depreciation	(6,199,955,243)
Investment in Real Estate, Net	17,208,313,107
Encumbrances	$ 0
Investment in Real Estate - Wholly Owned Encumbered [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	35
Units | ApartmentUnit	8,425
Investment in Real Estate, Gross	$ 3,204,805,398
Accumulated Depreciation	(792,348,079)
Investment in Real Estate, Net	2,412,457,319
Encumbrances	$ 1,630,731,451
Wholly Owned Properties
Overall summary of real estate and accumulated depreciation
Properties | Property	292
Units | ApartmentUnit	76,427
Investment in Real Estate, Gross	$ 26,613,073,748
Accumulated Depreciation	(6,992,303,322)
Investment in Real Estate, Net	19,620,770,426
Encumbrances	$ 1,630,731,451
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	$ 524,897,809
Accumulated Depreciation	(133,111,488)
Investment in Real Estate, Net	391,786,321
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	$ 395,635,869
Accumulated Depreciation	(151,371,564)
Investment in Real Estate, Net	244,264,305
Encumbrances	$ 310,878,101
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	$ 920,533,678
Accumulated Depreciation	(284,483,052)
Investment in Real Estate, Net	636,050,626
Encumbrances	$ 310,878,101
Unencumbered Properties [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	266
Units | ApartmentUnit	69,849
Investment in Real Estate, Gross	$ 23,933,166,159
Accumulated Depreciation	(6,333,066,731)
Investment in Real Estate, Net	17,600,099,428
Encumbrances	$ 0
Encumbered Properties [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	43
Units | ApartmentUnit	10,113
Investment in Real Estate, Gross	$ 3,600,441,267
Accumulated Depreciation	(943,719,643)
Investment in Real Estate, Net	2,656,721,624
Encumbrances	$ 1,941,609,552
Total Consolidated Investment in Real Estate [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	309
Units | ApartmentUnit	79,962
Investment in Real Estate, Gross	$ 27,533,607,426
Accumulated Depreciation	(7,276,786,374)
Investment in Real Estate, Net	20,256,821,052
Encumbrances	$ 1,941,609,552

Schedule III - Real Estate an_3

Schedule III - Real Estate and Accumulated Depreciation-Encumbrances Reconciliation (Details)	Dec. 31, 2019USD ($)Property
Total Consolidated Investment in Real Estate [Member]
Overall summary of real estate and accumulated depreciation
Encumbrances	$ 1,941,609,552
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	$ 798,230,171
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	$ 798,230,171
Individual Property Encumbrances [Member]
Overall summary of real estate and accumulated depreciation
Encumbrances	$ 1,143,379,381

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, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in total real estate
Balance, beginning of year	$ 26,511,022	$ 26,026,896	$ 25,386,425
Acquisitions and development	1,704,320	855,254	710,960
Improvements	180,944	192,661	204,113
Dispositions and other	(862,679)	(563,789)	(274,602)
Balance, end of year	$ 27,533,607	$ 26,511,022	$ 26,026,896

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, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in accumulated depreciation
Balance, beginning of year	$ 6,696,281	$ 6,040,378	$ 5,360,389
Depreciation	831,083	785,725	743,749
Dispositions and other	(250,578)	(129,822)	(63,760)
Balance, end of year	$ 7,276,786	$ 6,696,281	$ 6,040,378

Schedule III - Real Estate an_6

Schedule III - Real Estate and Accumulated Depreciation (Details)	12 Months Ended
	Dec. 31, 2019USD ($)ApartmentUnit	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Real Estate And Accumulated Depreciation Abstract
Accumulated Depreciation	$ (7,276,786,000)	$ (6,696,281,000)	$ (6,040,378,000)	$ (5,360,389,000)
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	69,662,369
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,484
Gross Amount Carried at close of period 12/31/2019, Land	15,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	69,664,853
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	85,264,853
Accumulated Depreciation	(3,157,965)
Investment in Real Estate, Net	82,106,888
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	10,160,746
Gross Amount Carried at close of period 12/31/2019, Land	103,539,100
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	104,243,471
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	207,782,571
Accumulated Depreciation	(52,510,393)
Investment in Real Estate, Net	155,272,178
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	17,198,947
Gross Amount Carried at close of period 12/31/2019, Land	139,933,500
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	208,163,692
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	348,097,192
Accumulated Depreciation	(104,423,480)
Investment in Real Estate, Net	243,673,712
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	439,194
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	112,536,149
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	112,536,149
Accumulated Depreciation	(20,556,743)
Investment in Real Estate, Net	91,979,406
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	2,003,647
Gross Amount Carried at close of period 12/31/2019, Land	22,037,831
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	55,965,816
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	78,003,647
Accumulated Depreciation	(18,206,594)
Investment in Real Estate, Net	59,797,053
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	4,764,589
Gross Amount Carried at close of period 12/31/2019, Land	32,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	97,439,817
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	129,839,817
Accumulated Depreciation	(27,077,371)
Investment in Real Estate, Net	102,762,446
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	14,692,592
Gross Amount Carried at close of period 12/31/2019, Land	144,968,250
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	153,039,273
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	298,007,523
Accumulated Depreciation	(78,364,843)
Investment in Real Estate, Net	219,642,680
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	399,141
Gross Amount Carried at close of period 12/31/2019, Land	18,937,702
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	95,157,820
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	114,095,522
Accumulated Depreciation	(25,780,466)
Investment in Real Estate, Net	88,315,056
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	2,770,003
Gross Amount Carried at close of period 12/31/2019, Land	9,213,512
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	39,329,192
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	48,542,704
Accumulated Depreciation	(20,032,298)
Investment in Real Estate, Net	28,510,406
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	5,482,703
Gross Amount Carried at close of period 12/31/2019, Land	9,780,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	95,150,868
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	104,930,868
Accumulated Depreciation	(38,110,856)
Investment in Real Estate, Net	66,820,012
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	15,851,496
Gross Amount Carried at close of period 12/31/2019, Land	54,638,298
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	56,213,198
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	110,851,496
Accumulated Depreciation	(29,241,959)
Investment in Real Estate, Net	81,609,537
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	7,759,305
Gross Amount Carried at close of period 12/31/2019, Land	31,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	116,765,039
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	148,165,039
Accumulated Depreciation	(32,605,736)
Investment in Real Estate, Net	115,559,303
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	2,653,163
Gross Amount Carried at close of period 12/31/2019, Land	11,321,198
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	52,327,338
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	63,648,536
Accumulated Depreciation	(15,332,930)
Investment in Real Estate, Net	48,315,606
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	4,621,475
Gross Amount Carried at close of period 12/31/2019, Land	21,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	83,346,138
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	105,246,138
Accumulated Depreciation	(23,254,386)
Investment in Real Estate, Net	81,991,752
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	4,706,151
Gross Amount Carried at close of period 12/31/2019, Land	30,006,593
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	118,719,936
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	148,726,529
Accumulated Depreciation	(57,645,397)
Investment in Real Estate, Net	91,081,132
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	1,261,179
Gross Amount Carried at close of period 12/31/2019, Land	14,450,070
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	117,086,109
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	131,536,179
Accumulated Depreciation	(22,891,380)
Investment in Real Estate, Net	108,644,799
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	248,609,655
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	179,247
Gross Amount Carried at close of period 12/31/2019, Land	42,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	248,788,902
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	290,788,902
Accumulated Depreciation	(33,388,938)
Investment in Real Estate, Net	257,399,964
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
341 Nevins [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Brooklyn, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 3,621,830
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	189,222
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2019, Land	3,621,830
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	189,222
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	3,811,052
Accumulated Depreciation	0
Investment in Real Estate, Net	3,811,052
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	7,157,154
Gross Amount Carried at close of period 12/31/2019, Land	56,300,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	148,348,734
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	204,648,734
Accumulated Depreciation	(43,856,738)
Investment in Real Estate, Net	160,791,996
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	4,759,357
Gross Amount Carried at close of period 12/31/2019, Land	28,150,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	143,359,357
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	171,509,357
Accumulated Depreciation	(53,491,733)
Investment in Real Estate, Net	118,017,624
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	$ 11,941,407
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	61,418,274
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	40,682
Gross Amount Carried at close of period 12/31/2019, Land	11,941,407
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	61,458,956
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	73,400,363
Accumulated Depreciation	(6,002,916)
Investment in Real Estate, Net	67,397,447
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	31,235,663
Gross Amount Carried at close of period 12/31/2019, Land	76,921,130
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	185,183,345
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	262,104,475
Accumulated Depreciation	(67,153,478)
Investment in Real Estate, Net	194,950,997
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	10,864,626
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	10,864,626
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	10,864,626
Accumulated Depreciation	0
Investment in Real Estate, Net	10,864,626
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	16,680,349
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2019, Land	13,131,456
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	16,680,349
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	29,811,805
Accumulated Depreciation	0
Investment in Real Estate, Net	29,811,805
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	1,548,076
Gross Amount Carried at close of period 12/31/2019, Land	32,852,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	44,688,627
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	77,540,627
Accumulated Depreciation	(22,331,625)
Investment in Real Estate, Net	55,209,002
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	4,730,410
Gross Amount Carried at close of period 12/31/2019, Land	106,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	171,042,089
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	277,142,089
Accumulated Depreciation	(46,949,010)
Investment in Real Estate, Net	230,193,079
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	2,932,277
Gross Amount Carried at close of period 12/31/2019, Land	28,108,899
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	239,695,830
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	267,804,729
Accumulated Depreciation	(81,879,133)
Investment in Real Estate, Net	185,925,596
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	17,054,425
Gross Amount Carried at close of period 12/31/2019, Land	22,611,600
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	94,546,596
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	117,158,196
Accumulated Depreciation	(51,104,697)
Investment in Real Estate, Net	66,053,499
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	479,898
Gross Amount Carried at close of period 12/31/2019, Land	5,249,124
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	19,089,774
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	24,338,898
Accumulated Depreciation	(6,408,288)
Investment in Real Estate, Net	17,930,610
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	7,688,560
Gross Amount Carried at close of period 12/31/2019, Land	27,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	176,681,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	204,581,000
Accumulated Depreciation	(47,768,422)
Investment in Real Estate, Net	156,812,578
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	4,999,856
Gross Amount Carried at close of period 12/31/2019, Land	65,352,706
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	70,747,150
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	136,099,856
Accumulated Depreciation	(30,672,075)
Investment in Real Estate, Net	105,427,781
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	3,225,899
Gross Amount Carried at close of period 12/31/2019, Land	7,786,800
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	34,813,224
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	42,600,024
Accumulated Depreciation	(11,434,181)
Investment in Real Estate, Net	31,165,843
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	282,107,685
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	62,476
Gross Amount Carried at close of period 12/31/2019, Land	41,363,921
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	282,170,161
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	323,534,082
Accumulated Depreciation	(23,429,467)
Investment in Real Estate, Net	300,104,615
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	7,695,575
Gross Amount Carried at close of period 12/31/2019, Land	3,252,993
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	29,441,170
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	32,694,163
Accumulated Depreciation	(19,893,418)
Investment in Real Estate, Net	12,800,745
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	9,821,339
Gross Amount Carried at close of period 12/31/2019, Land	25,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	33,414,533
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	58,414,533
Accumulated Depreciation	(20,345,297)
Investment in Real Estate, Net	38,069,236
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	2,301,628
Gross Amount Carried at close of period 12/31/2019, Land	5,839,548
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	31,662,080
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	37,501,628
Accumulated Depreciation	(12,293,107)
Investment in Real Estate, Net	25,208,521
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	396,492
Gross Amount Carried at close of period 12/31/2019, Land	5,550,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	16,182,001
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	21,732,001
Accumulated Depreciation	(7,612,133)
Investment in Real Estate, Net	14,119,868
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	6,474,195
Gross Amount Carried at close of period 12/31/2019, Land	18,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	96,268,396
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	115,168,396
Accumulated Depreciation	(25,786,581)
Investment in Real Estate, Net	89,381,815
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	9,528,299
Gross Amount Carried at close of period 12/31/2019, Land	24,310,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	68,742,428
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	93,052,428
Accumulated Depreciation	(44,468,172)
Investment in Real Estate, Net	48,584,256
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Alcott Apartments (fka West End Tower) [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	128,885,729
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2019, Land	10,424,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	128,885,729
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	139,309,729
Accumulated Depreciation	0
Investment in Real Estate, Net	139,309,729
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	150,235,905
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	493,024
Gross Amount Carried at close of period 12/31/2019, Land	43,783,485
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	150,728,929
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	194,512,414
Accumulated Depreciation	(20,615,169)
Investment in Real Estate, Net	173,897,245
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	96,526,323
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	150,438
Gross Amount Carried at close of period 12/31/2019, Land	11,049,027
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	96,676,761
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	107,725,788
Accumulated Depreciation	(11,346,591)
Investment in Real Estate, Net	96,379,197
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	11,357,865
Gross Amount Carried at close of period 12/31/2019, Land	9,057,300
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	29,841,507
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	38,898,807
Accumulated Depreciation	(17,937,496)
Investment in Real Estate, Net	20,961,311
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	2,623,168
Gross Amount Carried at close of period 12/31/2019, Land	26,650,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	65,473,168
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	92,123,168
Accumulated Depreciation	(24,870,049)
Investment in Real Estate, Net	67,253,119
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	1,173,462
Gross Amount Carried at close of period 12/31/2019, Land	8,000,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	37,248,062
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,248,462
Accumulated Depreciation	(12,924,017)
Investment in Real Estate, Net	32,324,445
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	1,889,100
Gross Amount Carried at close of period 12/31/2019, Land	7,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	22,426,459
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	29,426,459
Accumulated Depreciation	(13,116,756)
Investment in Real Estate, Net	16,309,703
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	7,189,056
Gross Amount Carried at close of period 12/31/2019, Land	12,300,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	68,655,323
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	80,955,323
Accumulated Depreciation	(20,908,096)
Investment in Real Estate, Net	60,047,227
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	432,778
Gross Amount Carried at close of period 12/31/2019, Land	32,401,680
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	47,568,210
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	79,969,890
Accumulated Depreciation	(8,426,826)
Investment in Real Estate, Net	71,543,064
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	2,417,128
Gross Amount Carried at close of period 12/31/2019, Land	7,995,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	20,422,128
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	28,417,128
Accumulated Depreciation	(7,587,499)
Investment in Real Estate, Net	20,829,629
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Axis at Shady Grove [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Rockville, MD
Real Estate And Accumulated Depreciation Units | ApartmentUnit	366
Initial Cost to Company, Land	$ 14,745,774
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	90,503,831
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	123,658
Gross Amount Carried at close of period 12/31/2019, Land	14,745,774
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	90,627,489
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	105,373,263
Accumulated Depreciation	(6,627,790)
Investment in Real Estate, Net	98,745,473
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	153,569,655
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	385,653
Gross Amount Carried at close of period 12/31/2019, Land	32,855,115
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	153,955,308
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	186,810,423
Accumulated Depreciation	(25,110,173)
Investment in Real Estate, Net	161,700,250
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	3,648,128
Gross Amount Carried at close of period 12/31/2019, Land	7,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	31,085,367
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	38,685,367
Accumulated Depreciation	(16,705,166)
Investment in Real Estate, Net	21,980,201
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	1,852,511
Gross Amount Carried at close of period 12/31/2019, Land	114,351,405
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	167,501,106
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	281,852,511
Accumulated Depreciation	(51,586,536)
Investment in Real Estate, Net	230,265,975
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	10,564,320
Gross Amount Carried at close of period 12/31/2019, Land	31,682,754
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	131,660,106
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	163,342,860
Accumulated Depreciation	(63,397,900)
Investment in Real Estate, Net	99,944,960
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 12/31/2019, 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	(91,640)
Investment in Real Estate, Net	209,773
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	2,077,210
Gross Amount Carried at close of period 12/31/2019, Land	9,098,808
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	30,778,402
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	39,877,210
Accumulated Depreciation	(9,929,838)
Investment in Real Estate, Net	29,947,372
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	2,301,977
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	75,491,239
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	75,491,239
Accumulated Depreciation	(22,556,033)
Investment in Real Estate, Net	52,935,206
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	4,223,652
Gross Amount Carried at close of period 12/31/2019, Land	9,991,500
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,470,930
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	36,462,430
Accumulated Depreciation	(19,003,418)
Investment in Real Estate, Net	17,459,012
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Brodie, The [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Westminster, CO
Real Estate And Accumulated Depreciation Units | ApartmentUnit	312
Initial Cost to Company, Land	$ 8,639,904
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	79,254,009
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	338,241
Gross Amount Carried at close of period 12/31/2019, Land	8,639,904
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	79,592,250
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	88,232,154
Accumulated Depreciation	(4,390,121)
Investment in Real Estate, Net	83,842,033
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	4,272,230
Gross Amount Carried at close of period 12/31/2019, Land	40,099,922
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	225,710,861
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	265,810,783
Accumulated Depreciation	(69,755,616)
Investment in Real Estate, Net	196,055,167
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	468,094
Gross Amount Carried at close of period 12/31/2019, Land	17,125,766
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	28,542,328
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,668,094
Accumulated Depreciation	(4,917,365)
Investment in Real Estate, Net	40,750,729
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	9,043,657
Gross Amount Carried at close of period 12/31/2019, Land	10,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	60,411,570
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	70,411,570
Accumulated Depreciation	(34,997,308)
Investment in Real Estate, Net	35,414,262
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	12,519,325
Gross Amount Carried at close of period 12/31/2019, Land	2,288,300
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	33,115,606
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,403,906
Accumulated Depreciation	(28,576,803)
Investment in Real Estate, Net	6,827,103
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	149,388,658
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	10,060
Gross Amount Carried at close of period 12/31/2019, Land	23,751,564
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	149,398,718
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	173,150,282
Accumulated Depreciation	(14,329,011)
Investment in Real Estate, Net	158,821,271
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	13,065,205
Gross Amount Carried at close of period 12/31/2019, Land	9,700,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	83,145,583
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	92,845,583
Accumulated Depreciation	(43,852,523)
Investment in Real Estate, Net	48,993,060
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	9,490,814
Gross Amount Carried at close of period 12/31/2019, Land	7,436,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	42,505,603
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	49,941,603
Accumulated Depreciation	(26,716,928)
Investment in Real Estate, Net	23,224,675
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Chloe on Madison (fka 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	137
Initial Cost to Company, Land	$ 10,401,958
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	52,593,395
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2019, Land	10,401,958
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	52,593,395
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	62,995,353
Accumulated Depreciation	(497,660)
Investment in Real Estate, Net	62,497,693
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Chloe on Union (fka 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	2,516,557
Gross Amount Carried at close of period 12/31/2019, Land	14,835,571
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	41,876,207
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	56,711,778
Accumulated Depreciation	(4,541,342)
Investment in Real Estate, Net	52,170,436
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	3,270,549
Gross Amount Carried at close of period 12/31/2019, Land	5,220,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	20,015,192
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	25,235,192
Accumulated Depreciation	(10,988,447)
Investment in Real Estate, Net	14,246,745
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	7,548,015
Gross Amount Carried at close of period 12/31/2019, Land	40,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	103,485,061
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	143,885,061
Accumulated Depreciation	(29,361,079)
Investment in Real Estate, Net	114,523,982
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	3,588,233
Gross Amount Carried at close of period 12/31/2019, Land	6,863,792
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	40,064,441
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	46,928,233
Accumulated Depreciation	(15,519,206)
Investment in Real Estate, Net	31,409,027
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	3,873,050
Gross Amount Carried at close of period 12/31/2019, Land	15,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	45,749,307
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	60,849,307
Accumulated Depreciation	(13,419,667)
Investment in Real Estate, Net	47,429,640
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	2,674,009
Gross Amount Carried at close of period 12/31/2019, Land	30,400,340
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	106,498,669
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	136,899,009
Accumulated Depreciation	(36,985,746)
Investment in Real Estate, Net	99,913,263
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	4,079,934
Gross Amount Carried at close of period 12/31/2019, Land	6,615,467
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,909,269
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	25,524,736
Accumulated Depreciation	(9,776,697)
Investment in Real Estate, Net	15,748,039
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	10,060,643
Gross Amount Carried at close of period 12/31/2019, Land	27,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	124,062,938
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	151,662,938
Accumulated Depreciation	(33,971,504)
Investment in Real Estate, Net	117,691,434
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	2,637,933
Gross Amount Carried at close of period 12/31/2019, Land	13,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	29,551,046
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	43,051,046
Accumulated Depreciation	(9,012,285)
Investment in Real Estate, Net	34,038,761
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	6,316,702
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	93,702,726
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	93,702,726
Accumulated Depreciation	(28,408,921)
Investment in Real Estate, Net	65,293,805
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	21,193,232
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,951,801
Gross Amount Carried at close of period 12/31/2019, Land	9,606,600
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,145,033
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,751,633
Accumulated Depreciation	(18,907,735)
Investment in Real Estate, Net	16,843,898
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	11,972,290
Gross Amount Carried at close of period 12/31/2019, Land	32,300,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	97,091,614
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	129,391,614
Accumulated Depreciation	(27,201,943)
Investment in Real Estate, Net	102,189,671
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	3,946,812
Gross Amount Carried at close of period 12/31/2019, Land	17,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	51,865,787
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	69,065,787
Accumulated Depreciation	(15,614,718)
Investment in Real Estate, Net	53,451,069
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Dalton, 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	270
Initial Cost to Company, Land	$ 22,947,777
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	95,292,515
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	(6)
Gross Amount Carried at close of period 12/31/2019, Land	22,947,777
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	95,292,509
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	118,240,286
Accumulated Depreciation	0
Investment in Real Estate, Net	118,240,286
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	15,675,022
Gross Amount Carried at close of period 12/31/2019, Land	2,082,095
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	34,414,837
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	36,496,932
Accumulated Depreciation	(30,453,714)
Investment in Real Estate, Net	6,043,218
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	4,246,225
Gross Amount Carried at close of period 12/31/2019, Land	7,801,824
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	41,194,401
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	48,996,225
Accumulated Depreciation	(17,680,819)
Investment in Real Estate, Net	31,315,406
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	10,865,978
Gross Amount Carried at close of period 12/31/2019, Land	1,808,900
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,140,339
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	28,949,239
Accumulated Depreciation	(20,747,510)
Investment in Real Estate, Net	8,201,729
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	1,674,370
Gross Amount Carried at close of period 12/31/2019, Land	13,092,552
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	45,581,818
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	58,674,370
Accumulated Depreciation	(15,155,907)
Investment in Real Estate, Net	43,518,463
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	35,014,249
Gross Amount Carried at close of period 12/31/2019, Land	14,855,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	92,580,885
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	107,435,885
Accumulated Depreciation	(63,325,270)
Investment in Real Estate, Net	44,110,615
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	3,847,449
Gross Amount Carried at close of period 12/31/2019, Land	8,700,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	29,293,452
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	37,993,452
Accumulated Depreciation	(10,801,336)
Investment in Real Estate, Net	27,192,116
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Eviva on Cherokee [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Denver, CO
Real Estate And Accumulated Depreciation Units | ApartmentUnit	274
Initial Cost to Company, Land	$ 10,507,626
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	100,037,204
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	151,235
Gross Amount Carried at close of period 12/31/2019, Land	10,507,626
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	100,188,439
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	110,696,065
Accumulated Depreciation	(6,553,585)
Investment in Real Estate, Net	104,142,480
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	3,935,049
Gross Amount Carried at close of period 12/31/2019, Land	25,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	87,921,266
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	113,821,266
Accumulated Depreciation	(25,270,333)
Investment in Real Estate, Net	88,550,933
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	4,490,634
Gross Amount Carried at close of period 12/31/2019, Land	25,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	83,243,748
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	109,043,748
Accumulated Depreciation	(24,471,382)
Investment in Real Estate, Net	84,572,366
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	400
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	3,537,268
Gross Amount Carried at close of period 12/31/2019, Land	17,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	78,216,185
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	95,716,185
Accumulated Depreciation	(20,628,153)
Investment in Real Estate, Net	75,088,032
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	2,995,980
Gross Amount Carried at close of period 12/31/2019, Land	18,144,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	49,563,921
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	67,707,921
Accumulated Depreciation	(24,741,834)
Investment in Real Estate, Net	42,966,087
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	16,463,954
Gross Amount Carried at close of period 12/31/2019, Land	9,209,780
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	42,186,620
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	51,396,400
Accumulated Depreciation	(26,861,288)
Investment in Real Estate, Net	24,535,112
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	165
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	6,197,853
Gross Amount Carried at close of period 12/31/2019, Land	1,722,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	21,669,282
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	23,391,682
Accumulated Depreciation	(15,406,560)
Investment in Real Estate, Net	7,985,122
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	865,330
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	103,315,658
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	103,315,658
Accumulated Depreciation	(11,248,402)
Investment in Real Estate, Net	92,067,256
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	8,125,571
Gross Amount Carried at close of period 12/31/2019, Land	10,806,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	38,460,901
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	49,266,901
Accumulated Depreciation	(19,841,849)
Investment in Real Estate, Net	29,425,052
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	761
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	40,880,428
Gross Amount Carried at close of period 12/31/2019, Land	59,403,601
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	199,709,860
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	259,113,461
Accumulated Depreciation	(97,046,373)
Investment in Real Estate, Net	162,067,088
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	13,674,471
Gross Amount Carried at close of period 12/31/2019, Land	2,512,500
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	36,286,383
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	38,798,883
Accumulated Depreciation	(27,001,675)
Investment in Real Estate, Net	11,797,208
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	206,628,093
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	110,524
Gross Amount Carried at close of period 12/31/2019, Land	18,061,674
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	206,738,617
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	224,800,291
Accumulated Depreciation	(20,125,380)
Investment in Real Estate, Net	204,674,911
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	2,849,652
Gross Amount Carried at close of period 12/31/2019, Land	10,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	34,657,987
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,457,987
Accumulated Depreciation	(17,798,543)
Investment in Real Estate, Net	27,659,444
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	4,605,503
Gross Amount Carried at close of period 12/31/2019, Land	6,895,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	23,589,100
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	30,484,100
Accumulated Depreciation	(11,968,336)
Investment in Real Estate, Net	18,515,764
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	1,653,931
Gross Amount Carried at close of period 12/31/2019, Land	23,299,892
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	104,354,039
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	127,653,931
Accumulated Depreciation	(25,277,554)
Investment in Real Estate, Net	102,376,377
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	2,592,223
Gross Amount Carried at close of period 12/31/2019, Land	10,080,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	40,119,135
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	50,199,135
Accumulated Depreciation	(20,191,766)
Investment in Real Estate, Net	30,007,369
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	965,477
Gross Amount Carried at close of period 12/31/2019, Land	9,435,760
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	33,529,717
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	42,965,477
Accumulated Depreciation	(11,609,215)
Investment in Real Estate, Net	31,356,262
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	3,000,297
Gross Amount Carried at close of period 12/31/2019, Land	23,420,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	72,977,996
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	96,397,996
Accumulated Depreciation	(38,482,671)
Investment in Real Estate, Net	57,915,325
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	6,902,664
Gross Amount Carried at close of period 12/31/2019, Land	5,350,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	48,016,738
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	53,366,738
Accumulated Depreciation	(26,064,218)
Investment in Real Estate, Net	27,302,520
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 12/31/2019, 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
Huxley, The [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	137
Initial Cost to Company, Land	$ 18,775,028
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	89,335,476
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,577
Gross Amount Carried at close of period 12/31/2019, Land	18,775,028
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	89,341,053
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	108,116,081
Accumulated Depreciation	(2,362,663)
Investment in Real Estate, Net	105,753,418
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	1,716,006
Gross Amount Carried at close of period 12/31/2019, Land	2,732,800
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	15,604,288
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	18,337,088
Accumulated Depreciation	(8,531,839)
Investment in Real Estate, Net	9,805,249
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	77,752,457
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	816,097
Gross Amount Carried at close of period 12/31/2019, Land	14,791,831
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	78,568,554
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	93,360,385
Accumulated Depreciation	(22,410,277)
Investment in Real Estate, Net	70,950,108
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	56,576,329
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	139,678
Gross Amount Carried at close of period 12/31/2019, Land	11,726,305
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	56,716,007
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	68,442,312
Accumulated Depreciation	(9,832,830)
Investment in Real Estate, Net	58,609,482
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	593,826
Gross Amount Carried at close of period 12/31/2019, Land	15,521,552
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	65,447,274
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	80,968,826
Accumulated Depreciation	(12,644,037)
Investment in Real Estate, Net	68,324,789
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	4,164,875
Gross Amount Carried at close of period 12/31/2019, Land	14,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	28,827,758
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	42,927,758
Accumulated Depreciation	(14,951,144)
Investment in Real Estate, Net	27,976,614
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	29,597,400
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,500,048
Gross Amount Carried at close of period 12/31/2019, Land	13,642,420
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	35,097,448
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	48,739,868
Accumulated Depreciation	(19,856,605)
Investment in Real Estate, Net	28,883,263
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	14,471,631
Gross Amount Carried at close of period 12/31/2019, Land	27,246,045
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	52,212,681
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	79,458,726
Accumulated Depreciation	(33,207,884)
Investment in Real Estate, Net	46,250,842
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Lane [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	217
Initial Cost to Company, Land	$ 13,142,946
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	71,853,083
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	(1)
Gross Amount Carried at close of period 12/31/2019, Land	13,142,946
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	71,853,082
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	84,996,028
Accumulated Depreciation	0
Investment in Real Estate, Net	84,996,028
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Lex, The [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	387
Initial Cost to Company, Land	$ 21,817,512
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	158,778,598
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	77,511
Gross Amount Carried at close of period 12/31/2019, Land	21,817,512
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	158,856,109
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	180,673,621
Accumulated Depreciation	(8,972,354)
Investment in Real Estate, Net	171,701,267
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	6,951,551
Gross Amount Carried at close of period 12/31/2019, Land	5,977,504
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	33,700,662
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	39,678,166
Accumulated Depreciation	(19,975,624)
Investment in Real Estate, Net	19,702,542
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	2,551,120
Gross Amount Carried at close of period 12/31/2019, Land	16,382,822
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	86,368,198
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	102,751,020
Accumulated Depreciation	(31,785,187)
Investment in Real Estate, Net	70,965,833
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	15,019,958
Gross Amount Carried at close of period 12/31/2019, Land	5,928,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	48,615,220
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	54,543,620
Accumulated Depreciation	(37,746,289)
Investment in Real Estate, Net	16,797,331
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	2,055,111
Gross Amount Carried at close of period 12/31/2019, Land	5,805,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,760,111
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	33,565,111
Accumulated Depreciation	(10,259,804)
Investment in Real Estate, Net	23,305,307
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	6,941,386
Gross Amount Carried at close of period 12/31/2019, Land	18,696,674
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	85,387,043
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	104,083,717
Accumulated Depreciation	(24,300,285)
Investment in Real Estate, Net	79,783,432
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Lofts at Kendall Square ll (fka 249 Third Street) [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Cambridge, MA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	84
Initial Cost to Company, Land	$ 4,603,326
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	42,655,411
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2019, Land	4,603,326
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	42,655,411
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	47,258,737
Accumulated Depreciation	(388,231)
Investment in Real Estate, Net	46,870,506
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	4,562,899
Gross Amount Carried at close of period 12/31/2019, Land	73,170,045
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	58,525,409
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	131,695,454
Accumulated Depreciation	(26,269,075)
Investment in Real Estate, Net	105,426,379
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	86,857,633
Gross Amount Carried at close of period 12/31/2019, Land	38,264,917
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	219,033,548
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	257,298,465
Accumulated Depreciation	(153,930,179)
Investment in Real Estate, Net	103,368,286
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Madox [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	131
Initial Cost to Company, Land	$ 9,679,635
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	64,594,205
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	456,215
Gross Amount Carried at close of period 12/31/2019, Land	9,679,635
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	65,050,420
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	74,730,055
Accumulated Depreciation	(4,991,342)
Investment in Real Estate, Net	69,738,713
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	1,159,451
Gross Amount Carried at close of period 12/31/2019, Land	22,346,513
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	62,660,609
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	85,007,122
Accumulated Depreciation	(18,028,047)
Investment in Real Estate, Net	66,979,075
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	9,214,698
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	178,057,140
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	178,057,140
Accumulated Depreciation	(53,401,243)
Investment in Real Estate, Net	124,655,897
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	6,259,009
Gross Amount Carried at close of period 12/31/2019, Land	60,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	95,570,491
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	156,470,491
Accumulated Depreciation	(28,260,197)
Investment in Real Estate, Net	128,210,294
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Mark on 8th [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	174
Initial Cost to Company, Land	$ 23,004,387
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	51,148,861
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	132,254
Gross Amount Carried at close of period 12/31/2019, Land	23,004,387
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	51,281,115
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	74,285,502
Accumulated Depreciation	(4,399,467)
Investment in Real Estate, Net	69,886,035
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	2,433,811
Gross Amount Carried at close of period 12/31/2019, Land	13,740,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	43,191,112
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	56,931,112
Accumulated Depreciation	(21,071,334)
Investment in Real Estate, Net	35,859,778
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	4,128,987
Gross Amount Carried at close of period 12/31/2019, Land	8,125,216
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	31,507,771
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	39,632,987
Accumulated Depreciation	(9,253,714)
Investment in Real Estate, Net	30,379,273
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	17,604,121
Gross Amount Carried at close of period 12/31/2019, Land	12,858,693
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	74,772,624
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	87,631,317
Accumulated Depreciation	(39,853,420)
Investment in Real Estate, Net	47,777,897
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	8,510,123
Gross Amount Carried at close of period 12/31/2019, Land	8,160,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	37,871,061
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	46,031,061
Accumulated Depreciation	(26,472,405)
Investment in Real Estate, Net	19,558,656
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	1,537,111
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	61,118,009
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	61,118,009
Accumulated Depreciation	(23,624,406)
Investment in Real Estate, Net	37,493,603
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	882,046
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	882,046
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	882,046
Accumulated Depreciation	0
Investment in Real Estate, Net	882,046
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	2,472,824
Gross Amount Carried at close of period 12/31/2019, Land	8,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	55,002,270
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	63,502,270
Accumulated Depreciation	(26,004,162)
Investment in Real Estate, Net	37,498,108
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	10,547,453
Gross Amount Carried at close of period 12/31/2019, Land	75,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	113,252,854
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	189,052,854
Accumulated Depreciation	(34,480,104)
Investment in Real Estate, Net	154,572,750
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Next on Sixth [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	398
Initial Cost to Company, Land	$ 52,509,906
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	136,635,362
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	52,028
Gross Amount Carried at close of period 12/31/2019, Land	52,509,906
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	136,687,390
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	189,197,296
Accumulated Depreciation	(6,067,150)
Investment in Real Estate, Net	183,130,146
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	5,767,779
Gross Amount Carried at close of period 12/31/2019, Land	4,000,159
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	100,058,369
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	104,058,528
Accumulated Depreciation	(53,298,183)
Investment in Real Estate, Net	50,760,345
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	6,828,841
Gross Amount Carried at close of period 12/31/2019, Land	9,360,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,607,394
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	36,967,394
Accumulated Depreciation	(16,473,980)
Investment in Real Estate, Net	20,493,414
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	15,236,070
Gross Amount Carried at close of period 12/31/2019, Land	38,607,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	92,708,287
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	131,315,287
Accumulated Depreciation	(40,034,278)
Investment in Real Estate, Net	91,281,009
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	11,618,255
Gross Amount Carried at close of period 12/31/2019, Land	5,524,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,309,960
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	31,833,960
Accumulated Depreciation	(20,784,027)
Investment in Real Estate, Net	11,049,933
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	11,129,906
Gross Amount Carried at close of period 12/31/2019, Land	3,390,700
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	41,647,180
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,037,880
Accumulated Depreciation	(33,598,181)
Investment in Real Estate, Net	11,439,699
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	7,150,916
Gross Amount Carried at close of period 12/31/2019, Land	23,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	68,171,354
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	91,571,354
Accumulated Depreciation	(38,896,036)
Investment in Real Estate, Net	52,675,318
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	4,164,931
Gross Amount Carried at close of period 12/31/2019, Land	15,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	39,639,267
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	55,039,267
Accumulated Depreciation	(11,715,439)
Investment in Real Estate, Net	43,323,828
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	4,831,677
Gross Amount Carried at close of period 12/31/2019, Land	5,111,200
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	16,742,115
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	21,853,315
Accumulated Depreciation	(11,831,439)
Investment in Real Estate, Net	10,021,876
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	64,519,515
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	70,389
Gross Amount Carried at close of period 12/31/2019, Land	16,807,519
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	64,589,904
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	81,397,423
Accumulated Depreciation	(11,050,157)
Investment in Real Estate, Net	70,347,266
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	821,523
Gross Amount Carried at close of period 12/31/2019, Land	7,740,467
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	44,967,704
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	52,708,171
Accumulated Depreciation	(8,666,808)
Investment in Real Estate, Net	44,041,363
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 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	10,370,617
Gross Amount Carried at close of period 12/31/2019, Land	14,752,034
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	83,706,042
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	98,458,076
Accumulated Depreciation	(46,375,373)
Investment in Real Estate, Net	52,082,703
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	139,558,692
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	22,022
Gross Amount Carried at close of period 12/31/2019, Land	30,224,393
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	139,580,714
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	169,805,107
Accumulated Depreciation	(16,605,628)
Investment in Real Estate, Net	153,199,479
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	6,249,693
Gross Amount Carried at close of period 12/31/2019, Land	22,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	34,922,672
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	57,122,672
Accumulated Depreciation	(9,689,007)
Investment in Real Estate, Net	47,433,665
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	2,028,500
Gross Amount Carried at close of period 12/31/2019, Land	32,250,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	112,778,500
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	145,028,500
Accumulated Depreciation	(31,554,841)
Investment in Real Estate, Net	113,473,659
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	1,112,353
Gross Amount Carried at close of period 12/31/2019, Land	5,911,041
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	21,067,312
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	26,978,353
Accumulated Depreciation	(3,941,611)
Investment in Real Estate, Net	23,036,742
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	6,560,029
Gross Amount Carried at close of period 12/31/2019, Land	40,504,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	24,585,708
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	65,089,708
Accumulated Depreciation	(14,088,276)
Investment in Real Estate, Net	51,001,432
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	7,590,854
Gross Amount Carried at close of period 12/31/2019, Land	37,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	17,446,451
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	55,046,451
Accumulated Depreciation	(11,702,099)
Investment in Real Estate, Net	43,344,352
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	9,553,310
Gross Amount Carried at close of period 12/31/2019, Land	52,654,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	32,599,061
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	85,253,061
Accumulated Depreciation	(19,280,179)
Investment in Real Estate, Net	65,972,882
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	12,219,604
Gross Amount Carried at close of period 12/31/2019, Land	102,163,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	121,209,006
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	223,372,006
Accumulated Depreciation	(56,644,803)
Investment in Real Estate, Net	166,727,203
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	419,037
Gross Amount Carried at close of period 12/31/2019, Land	16,667,059
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	65,492,546
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	82,159,605
Accumulated Depreciation	(12,009,148)
Investment in Real Estate, Net	70,150,457
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	1,863,350
Gross Amount Carried at close of period 12/31/2019, Land	13,700,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	60,950,869
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	74,650,869
Accumulated Depreciation	(16,566,168)
Investment in Real Estate, Net	58,084,701
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	6,614,073
Gross Amount Carried at close of period 12/31/2019, Land	43,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	135,367,432
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	178,567,432
Accumulated Depreciation	(39,974,119)
Investment in Real Estate, Net	138,593,313
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	12,126,113
Gross Amount Carried at close of period 12/31/2019, Land	3,033,500
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	39,428,496
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	42,461,996
Accumulated Depreciation	(30,924,343)
Investment in Real Estate, Net	11,537,653
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	8,185,992
Gross Amount Carried at close of period 12/31/2019, Land	6,246,700
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	20,013,445
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	26,260,145
Accumulated Depreciation	(13,217,770)
Investment in Real Estate, Net	13,042,375
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	1,051,124
Gross Amount Carried at close of period 12/31/2019, Land	6,972,585
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,578,539
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	34,551,124
Accumulated Depreciation	(5,151,187)
Investment in Real Estate, Net	29,399,937
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	5,726,479
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	126,521,838
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	126,521,838
Accumulated Depreciation	(38,784,120)
Investment in Real Estate, Net	87,737,718
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	6,904,081
Gross Amount Carried at close of period 12/31/2019, Land	18,094,052
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	88,810,029
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	106,904,081
Accumulated Depreciation	(32,523,925)
Investment in Real Estate, Net	74,380,156
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	23,756,377
Gross Amount Carried at close of period 12/31/2019, Land	35,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	57,230,199
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	92,330,199
Accumulated Depreciation	(31,171,766)
Investment in Real Estate, Net	61,158,433
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	3,874,242
Gross Amount Carried at close of period 12/31/2019, Land	3,572,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,535,236
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	22,107,636
Accumulated Depreciation	(14,171,043)
Investment in Real Estate, Net	7,936,593
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	5,837,031
Gross Amount Carried at close of period 12/31/2019, Land	8,640,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,324,157
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,964,157
Accumulated Depreciation	(17,518,529)
Investment in Real Estate, Net	18,445,628
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	24,128,821
Gross Amount Carried at close of period 12/31/2019, Land	22,487,006
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	120,971,734
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	143,458,740
Accumulated Depreciation	(89,422,204)
Investment in Real Estate, Net	54,036,536
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	181,812,933
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	518,975
Gross Amount Carried at close of period 12/31/2019, Land	40,830,011
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	182,331,908
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	223,161,919
Accumulated Depreciation	(26,294,704)
Investment in Real Estate, Net	196,867,215
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	5,928,659
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	73,905,972
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	73,905,972
Accumulated Depreciation	(21,102,334)
Investment in Real Estate, Net	52,803,638
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	281
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	2,669,467
Gross Amount Carried at close of period 12/31/2019, Land	34,625,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	80,549,207
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	115,174,207
Accumulated Depreciation	(32,656,903)
Investment in Real Estate, Net	82,517,304
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	171,649,131
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	208,922
Gross Amount Carried at close of period 12/31/2019, Land	76,292,169
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	171,858,053
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	248,150,222
Accumulated Depreciation	(32,299,311)
Investment in Real Estate, Net	215,850,911
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	10,883,962
Gross Amount Carried at close of period 12/31/2019, Land	28,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	80,679,877
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	108,879,877
Accumulated Depreciation	(44,391,535)
Investment in Real Estate, Net	64,488,342
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	4,537,035
Gross Amount Carried at close of period 12/31/2019, Land	3,573,621
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	23,592,540
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	27,166,161
Accumulated Depreciation	(12,025,867)
Investment in Real Estate, Net	15,140,294
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	4,202,638
Gross Amount Carried at close of period 12/31/2019, Land	26,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	88,613,800
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	115,513,800
Accumulated Depreciation	(25,515,603)
Investment in Real Estate, Net	89,998,197
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	121,899,084
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	640,652
Gross Amount Carried at close of period 12/31/2019, Land	13,644,960
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	122,539,736
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	136,184,696
Accumulated Depreciation	(9,914,578)
Investment in Real Estate, Net	126,270,118
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	1,448,098
Gross Amount Carried at close of period 12/31/2019, Land	15,546,376
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	66,768,108
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	82,314,484
Accumulated Depreciation	(20,622,372)
Investment in Real Estate, Net	61,692,112
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	1,211,705
Gross Amount Carried at close of period 12/31/2019, Land	10,300,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	34,700,450
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,000,450
Accumulated Depreciation	(11,274,160)
Investment in Real Estate, Net	33,726,290
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	7,272,427
Gross Amount Carried at close of period 12/31/2019, Land	1,857,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	23,985,681
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	25,843,081
Accumulated Depreciation	(19,161,878)
Investment in Real Estate, Net	6,681,203
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	4,855,911
Gross Amount Carried at close of period 12/31/2019, Land	10,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	57,668,846
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	68,168,846
Accumulated Depreciation	(32,743,477)
Investment in Real Estate, Net	35,425,369
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	4,852,458
Gross Amount Carried at close of period 12/31/2019, Land	6,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	39,437,518
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,937,518
Accumulated Depreciation	(22,240,250)
Investment in Real Estate, Net	23,697,268
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	3,893,736
Gross Amount Carried at close of period 12/31/2019, Land	16,345,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	76,974,406
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	93,319,406
Accumulated Depreciation	(39,080,433)
Investment in Real Estate, Net	54,238,973
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 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	12,239,068
Gross Amount Carried at close of period 12/31/2019, Land	15,804,057
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	75,368,119
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	91,172,176
Accumulated Depreciation	(44,632,394)
Investment in Real Estate, Net	46,539,782
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	7,608,914
Gross Amount Carried at close of period 12/31/2019, Land	27,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	40,638,519
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	67,638,519
Accumulated Depreciation	(12,863,114)
Investment in Real Estate, Net	54,775,405
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	17,256,235
Gross Amount Carried at close of period 12/31/2019, Land	11,918,917
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	86,118,876
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	98,037,793
Accumulated Depreciation	(45,846,659)
Investment in Real Estate, Net	52,191,134
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	77,623,664
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	8,538,253
Gross Amount Carried at close of period 12/31/2019, Land	16,768,705
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	86,161,917
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	102,930,622
Accumulated Depreciation	(36,697,179)
Investment in Real Estate, Net	66,233,443
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Residences at Westgate I (fka Westgate 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	477,844
Gross Amount Carried at close of period 12/31/2019, Land	17,859,785
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	109,737,702
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	127,597,487
Accumulated Depreciation	(27,267,435)
Investment in Real Estate, Net	100,330,052
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Residences at Westgate II (fka Westgate 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	40,486,467
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	97,831
Gross Amount Carried at close of period 12/31/2019, Land	12,118,248
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	40,584,298
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	52,702,546
Accumulated Depreciation	(7,453,042)
Investment in Real Estate, Net	45,249,504
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	1,408,357
Gross Amount Carried at close of period 12/31/2019, Land	4,430,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	30,706,453
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,136,453
Accumulated Depreciation	(12,521,975)
Investment in Real Estate, Net	22,614,478
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	6,152,653
Gross Amount Carried at close of period 12/31/2019, Land	11,809,500
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	40,156,701
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	51,966,201
Accumulated Depreciation	(27,801,818)
Investment in Real Estate, Net	24,164,383
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	6,552,889
Gross Amount Carried at close of period 12/31/2019, Land	34,963,355
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	91,140,547
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	126,103,902
Accumulated Depreciation	(27,578,186)
Investment in Real Estate, Net	98,525,716
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	3,532,047
Gross Amount Carried at close of period 12/31/2019, Land	17,136,645
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	44,068,578
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	61,205,223
Accumulated Depreciation	(12,214,368)
Investment in Real Estate, Net	48,990,855
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	4,145,694
Gross Amount Carried at close of period 12/31/2019, Land	14,355,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	85,039,743
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	99,394,743
Accumulated Depreciation	(27,531,587)
Investment in Real Estate, Net	71,863,156
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	112,522,073
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,385,966
Gross Amount Carried at close of period 12/31/2019, Land	34,340,640
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	114,908,039
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	149,248,679
Accumulated Depreciation	(11,203,805)
Investment in Real Estate, Net	138,044,874
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	1,575,032
Gross Amount Carried at close of period 12/31/2019, Land	4,922,840
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	31,777,192
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	36,700,032
Accumulated Depreciation	(11,139,316)
Investment in Real Estate, Net	25,560,716
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	1,508,474
Gross Amount Carried at close of period 12/31/2019, Land	14,641,990
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	44,366,484
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	59,008,474
Accumulated Depreciation	(16,104,349)
Investment in Real Estate, Net	42,904,125
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Saxton [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Seattle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	325
Initial Cost to Company, Land	$ 38,805,400
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	128,661,766
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,221
Gross Amount Carried at close of period 12/31/2019, Land	38,805,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	128,662,987
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	167,468,387
Accumulated Depreciation	(1,106,731)
Investment in Real Estate, Net	166,361,656
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	4,559,907
Gross Amount Carried at close of period 12/31/2019, Land	663,800
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	10,534,710
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	11,198,510
Accumulated Depreciation	(8,193,189)
Investment in Real Estate, Net	3,005,321
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	16,837,180
Gross Amount Carried at close of period 12/31/2019, Land	3,342,381
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	48,174,512
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	51,516,893
Accumulated Depreciation	(39,604,857)
Investment in Real Estate, Net	11,912,036
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	7,673,467
Gross Amount Carried at close of period 12/31/2019, Land	8,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	31,756,491
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	40,656,491
Accumulated Depreciation	(22,703,857)
Investment in Real Estate, Net	17,952,634
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	6,439,296
Gross Amount Carried at close of period 12/31/2019, Land	10,560,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	32,013,753
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	42,573,753
Accumulated Depreciation	(19,701,076)
Investment in Real Estate, Net	22,872,677
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	126,360,318
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	260,188
Gross Amount Carried at close of period 12/31/2019, Land	13,562,331
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	126,620,506
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	140,182,837
Accumulated Depreciation	(10,544,133)
Investment in Real Estate, Net	129,638,704
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	5,693,705
Gross Amount Carried at close of period 12/31/2019, Land	1,781,600
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	22,425,621
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	24,207,221
Accumulated Depreciation	(15,390,513)
Investment in Real Estate, Net	8,816,708
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	8,685,848
Gross Amount Carried at close of period 12/31/2019, Land	16,836,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	44,099,848
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	60,935,848
Accumulated Depreciation	(16,883,846)
Investment in Real Estate, Net	44,052,002
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	5,952,747
Gross Amount Carried at close of period 12/31/2019, Land	3,380,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,905,610
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	31,285,610
Accumulated Depreciation	(18,956,521)
Investment in Real Estate, Net	12,329,089
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	5,863,582
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2019, Land	29,406,606
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	5,863,582
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,270,188
Accumulated Depreciation	0
Investment in Real Estate, Net	35,270,188
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	6,103,825
Gross Amount Carried at close of period 12/31/2019, Land	7,503,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	30,152,332
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	37,655,732
Accumulated Depreciation	(21,265,834)
Investment in Real Estate, Net	16,389,898
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	5,496,725
Gross Amount Carried at close of period 12/31/2019, Land	68,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	84,973,586
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	153,873,586
Accumulated Depreciation	(24,542,210)
Investment in Real Estate, Net	129,331,376
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	6,974,332
Gross Amount Carried at close of period 12/31/2019, Land	6,936,600
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	21,298,401
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	28,235,001
Accumulated Depreciation	(13,871,734)
Investment in Real Estate, Net	14,363,267
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 12/31/2019, 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	413,447
Gross Amount Carried at close of period 12/31/2019, Land	9,163,667
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	48,324,428
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	57,488,095
Accumulated Depreciation	(6,348,664)
Investment in Real Estate, Net	51,139,431
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
STOA [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	237
Initial Cost to Company, Land	$ 25,326,048
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	79,976,031
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	355,097
Gross Amount Carried at close of period 12/31/2019, Land	25,326,048
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	80,331,128
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	105,657,176
Accumulated Depreciation	(4,420,377)
Investment in Real Estate, Net	101,236,799
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 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	$ 2,890,450
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	8,502,754
Gross Amount Carried at close of period 12/31/2019, Land	2,890,450
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	32,173,643
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,064,093
Accumulated Depreciation	(25,071,401)
Investment in Real Estate, Net	9,992,692
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	9,826,451
Gross Amount Carried at close of period 12/31/2019, Land	26,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	38,261,475
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	64,261,475
Accumulated Depreciation	(13,610,363)
Investment in Real Estate, Net	50,651,112
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	839,289
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	59,721,162
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	59,721,162
Accumulated Depreciation	(16,244,073)
Investment in Real Estate, Net	43,477,089
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	2,303,726
Gross Amount Carried at close of period 12/31/2019, Land	14,087,610
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,617,877
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	32,705,487
Accumulated Depreciation	(7,132,658)
Investment in Real Estate, Net	25,572,829
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	8,710,964
Gross Amount Carried at close of period 12/31/2019, Land	26,767,171
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	227,533,692
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	254,300,863
Accumulated Depreciation	(86,467,715)
Investment in Real Estate, Net	167,833,148
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	783,255
Gross Amount Carried at close of period 12/31/2019, Land	7,030,766
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	29,789,017
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	36,819,783
Accumulated Depreciation	(8,010,054)
Investment in Real Estate, Net	28,809,729
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	23,541,748
Gross Amount Carried at close of period 12/31/2019, Land	39,410,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	74,347,820
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	113,757,820
Accumulated Depreciation	(44,385,604)
Investment in Real Estate, Net	69,372,216
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	9,536,594
Gross Amount Carried at close of period 12/31/2019, Land	24,360,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	95,715,308
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	120,075,308
Accumulated Depreciation	(47,769,571)
Investment in Real Estate, Net	72,305,737
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	4,431,783
Gross Amount Carried at close of period 12/31/2019, Land	15,568,464
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	59,461,390
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	75,029,854
Accumulated Depreciation	(23,267,306)
Investment in Real Estate, Net	51,762,548
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	181,607,331
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	657,969
Gross Amount Carried at close of period 12/31/2019, Land	34,641,051
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	182,265,300
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	216,906,351
Accumulated Depreciation	(16,175,931)
Investment in Real Estate, Net	200,730,420
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	289
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	2,128,448
Gross Amount Carried at close of period 12/31/2019, Land	12,542,418
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	77,928,538
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	90,470,956
Accumulated Depreciation	(20,704,557)
Investment in Real Estate, Net	69,766,399
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	4,603,487
Gross Amount Carried at close of period 12/31/2019, Land	8,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,791,775
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,591,775
Accumulated Depreciation	(12,717,581)
Investment in Real Estate, Net	22,874,194
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	10,700,900
Gross Amount Carried at close of period 12/31/2019, Land	9,403,960
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	201,296,940
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	210,700,900
Accumulated Depreciation	(73,412,146)
Investment in Real Estate, Net	137,288,754
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	1,876,091
Gross Amount Carried at close of period 12/31/2019, Land	15,322,724
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	78,052,685
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	93,375,409
Accumulated Depreciation	(23,071,740)
Investment in Real Estate, Net	70,303,669
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Venue at the Promenade [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Castle Rock, CO
Real Estate And Accumulated Depreciation Units | ApartmentUnit	312
Initial Cost to Company, Land	$ 8,355,048
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	83,752,689
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	89,298
Gross Amount Carried at close of period 12/31/2019, Land	8,355,048
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	83,841,987
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	92,197,035
Accumulated Depreciation	(4,260,814)
Investment in Real Estate, Net	87,936,221
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	4,541,057
Gross Amount Carried at close of period 12/31/2019, Land	5,190,700
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	14,220,166
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	19,410,866
Accumulated Depreciation	(10,817,710)
Investment in Real Estate, Net	8,593,156
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	3,911,967
Gross Amount Carried at close of period 12/31/2019, Land	18,539,817
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	134,319,332
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	152,859,149
Accumulated Depreciation	(48,528,051)
Investment in Real Estate, Net	104,331,098
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	8,301,520
Gross Amount Carried at close of period 12/31/2019, Land	12,650,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	41,957,812
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	54,607,812
Accumulated Depreciation	(24,444,631)
Investment in Real Estate, Net	30,163,181
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	1,768,461
Gross Amount Carried at close of period 12/31/2019, Land	10,590,975
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	46,177,486
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	56,768,461
Accumulated Depreciation	(18,704,272)
Investment in Real Estate, Net	38,064,189
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	1,455,531
Gross Amount Carried at close of period 12/31/2019, Land	10,350,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	36,888,968
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	47,238,968
Accumulated Depreciation	(17,138,982)
Investment in Real Estate, Net	30,099,986
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	14,985,677
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	11,916,441
Gross Amount Carried at close of period 12/31/2019, Land	1,665,100
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,902,118
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	28,567,218
Accumulated Depreciation	(21,819,381)
Investment in Real Estate, Net	6,747,837
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	3,059,227
Gross Amount Carried at close of period 12/31/2019, Land	15,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	43,918,623
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	59,018,623
Accumulated Depreciation	(13,135,144)
Investment in Real Estate, Net	45,883,479
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	6,071,125
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	92,011,128
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	92,011,128
Accumulated Depreciation	(25,981,773)
Investment in Real Estate, Net	66,029,355
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	177,551,020
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	530,009
Gross Amount Carried at close of period 12/31/2019, Land	27,709,329
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	178,081,029
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	205,790,358
Accumulated Depreciation	(26,777,048)
Investment in Real Estate, Net	179,013,310
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	18,471,821
Gross Amount Carried at close of period 12/31/2019, Land	4,525,800
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	59,208,114
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	63,733,914
Accumulated Depreciation	(50,585,532)
Investment in Real Estate, Net	13,148,382
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	4,534,927
Gross Amount Carried at close of period 12/31/2019, Land	12,448,888
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	56,579,375
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	69,028,263
Accumulated Depreciation	(21,419,276)
Investment in Real Estate, Net	47,608,987
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	10,352,960
Gross Amount Carried at close of period 12/31/2019, Land	34,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	118,838,819
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	153,238,819
Accumulated Depreciation	(34,973,941)
Investment in Real Estate, Net	118,264,878
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	1,780,526
Gross Amount Carried at close of period 12/31/2019, Land	16,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	35,854,582
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	52,654,582
Accumulated Depreciation	(10,288,446)
Investment in Real Estate, Net	42,366,136
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	67,055,501
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,032,361
Gross Amount Carried at close of period 12/31/2019, Land	84,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	73,087,862
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	157,887,862
Accumulated Depreciation	(23,339,208)
Investment in Real Estate, Net	134,548,654
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	4,644,170
Gross Amount Carried at close of period 12/31/2019, Land	469,546
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	167,767,192
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	168,236,738
Accumulated Depreciation	(67,233,339)
Investment in Real Estate, Net	101,003,399
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	1,115,325
Gross Amount Carried at close of period 12/31/2019, Land	10,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	45,250,532
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	55,850,532
Accumulated Depreciation	(12,723,620)
Investment in Real Estate, Net	43,126,912
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	5,556,773
Gross Amount Carried at close of period 12/31/2019, Land	64,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	66,700,032
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	131,600,032
Accumulated Depreciation	(19,263,749)
Investment in Real Estate, Net	112,336,283
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	3,224,934
Gross Amount Carried at close of period 12/31/2019, Land	34,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	60,187,564
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	94,387,564
Accumulated Depreciation	(17,012,037)
Investment in Real Estate, Net	77,375,527
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	1,138,171
Gross Amount Carried at close of period 12/31/2019, Land	3,060,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	6,677,042
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	9,737,042
Accumulated Depreciation	(4,172,543)
Investment in Real Estate, Net	5,564,499
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	731,986
Gross Amount Carried at close of period 12/31/2019, Land	1,530,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	3,755,509
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	5,285,509
Accumulated Depreciation	(2,345,294)
Investment in Real Estate, Net	2,940,215
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	748,943
Gross Amount Carried at close of period 12/31/2019, Land	1,785,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	3,982,197
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	5,767,197
Accumulated Depreciation	(2,551,527)
Investment in Real Estate, Net	3,215,670
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	760,287
Gross Amount Carried at close of period 12/31/2019, Land	1,955,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	4,301,722
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	6,256,722
Accumulated Depreciation	(2,680,002)
Investment in Real Estate, Net	3,576,720
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	1,169,833
Gross Amount Carried at close of period 12/31/2019, Land	3,060,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	6,709,223
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	9,769,223
Accumulated Depreciation	(4,174,963)
Investment in Real Estate, Net	5,594,260
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	2,834,458
Gross Amount Carried at close of period 12/31/2019, Land	9,605,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	22,817,843
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	32,422,843
Accumulated Depreciation	(14,084,170)
Investment in Real Estate, Net	18,338,673
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	12,894,049
Gross Amount Carried at close of period 12/31/2019, Land	2,662,900
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	36,879,546
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	39,542,446
Accumulated Depreciation	(29,263,863)
Investment in Real Estate, Net	10,278,583
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	10,186,943
Gross Amount Carried at close of period 12/31/2019, Land	9,729,900
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	33,196,711
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	42,926,611
Accumulated Depreciation	(24,464,128)
Investment in Real Estate, Net	18,462,483
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	5,276,931
Gross Amount Carried at close of period 12/31/2019, Land	8,550,600
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	22,265,114
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	30,815,714
Accumulated Depreciation	(16,233,694)
Investment in Real Estate, Net	14,582,020
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	120,063,148
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	120,063,148
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	120,063,148
Accumulated Depreciation	(100,043,672)
Investment in Real Estate, Net	20,019,476
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	3,342,110
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	3,342,110
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	3,342,110
Accumulated Depreciation	0
Investment in Real Estate, Net	3,342,110
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Other
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	99,015
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	99,015
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	99,015
Accumulated Depreciation	(46,097)
Investment in Real Estate, Net	52,918
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	68,002
Initial Cost to Company, Land	$ 5,112,513,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	16,729,302,793
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,566,452,557
Gross Amount Carried at close of period 12/31/2019, Land	5,112,513,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,295,755,350
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	23,408,268,350
Accumulated Depreciation	(6,199,955,243)
Investment in Real Estate, Net	17,208,313,107
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	6,881,392
Gross Amount Carried at close of period 12/31/2019, Land	13,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	82,152,571
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	95,152,571
Accumulated Depreciation	(23,752,603)
Investment in Real Estate, Net	$ 71,399,968
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	5,454,780
Gross Amount Carried at close of period 12/31/2019, Land	48,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	101,629,419
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	150,529,419
Accumulated Depreciation	(29,129,896)
Investment in Real Estate, Net	121,399,523
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 61,827,655
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	9,514,116
Gross Amount Carried at close of period 12/31/2019, Land	79,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	88,636,740
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	168,036,740
Accumulated Depreciation	(25,938,650)
Investment in Real Estate, Net	$ 142,098,090
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	3,743,997
Gross Amount Carried at close of period 12/31/2019, Land	12,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	38,138,769
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	50,738,769
Accumulated Depreciation	(11,169,257)
Investment in Real Estate, Net	$ 39,569,512
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	13,813,466
Gross Amount Carried at close of period 12/31/2019, Land	21,041,710
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	85,744,789
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	106,786,499
Accumulated Depreciation	(29,022,401)
Investment in Real Estate, Net	77,764,098
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 24,527,815
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	1,521,001
Gross Amount Carried at close of period 12/31/2019, Land	11,379,497
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	50,881,504
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	62,261,001
Accumulated Depreciation	(11,900,832)
Investment in Real Estate, Net	50,360,169
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 27,246,175
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	4,104,266
Gross Amount Carried at close of period 12/31/2019, Land	12,960,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	22,601,949
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,561,949
Accumulated Depreciation	(11,252,625)
Investment in Real Estate, Net	24,309,324
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 28,015,078
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	5,726,350
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	120,047,969
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	120,047,969
Accumulated Depreciation	(32,447,760)
Investment in Real Estate, Net	87,600,209
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 85,443,736
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	2,412,100
Gross Amount Carried at close of period 12/31/2019, Land	12,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	45,939,479
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	58,539,479
Accumulated Depreciation	(13,266,223)
Investment in Real Estate, Net	$ 45,273,256
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	2,960,815
Gross Amount Carried at close of period 12/31/2019, Land	3,397,100
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	12,249,889
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	15,646,989
Accumulated Depreciation	(8,780,971)
Investment in Real Estate, Net	6,866,018
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 9,248,429
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	2,141,605
Gross Amount Carried at close of period 12/31/2019, Land	9,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	19,091,931
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	28,091,931
Accumulated Depreciation	(5,582,509)
Investment in Real Estate, Net	22,509,422
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 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	5,509,932
Gross Amount Carried at close of period 12/31/2019, Land	18,300,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	71,902,346
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	90,202,346
Accumulated Depreciation	(20,430,345)
Investment in Real Estate, Net	69,772,001
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 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	3,113,933
Gross Amount Carried at close of period 12/31/2019, Land	23,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	56,159,006
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	79,659,006
Accumulated Depreciation	(16,792,580)
Investment in Real Estate, Net	62,866,426
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	1,010,321
Gross Amount Carried at close of period 12/31/2019, Land	14,080,560
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	57,429,761
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	71,510,321
Accumulated Depreciation	(14,460,258)
Investment in Real Estate, Net	57,050,063
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 38,356,888
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	1,914,108
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	125,673,912
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	125,673,912
Accumulated Depreciation	(36,538,855)
Investment in Real Estate, Net	89,135,057
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 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	1,576,897
Gross Amount Carried at close of period 12/31/2019, Land	23,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	89,299,218
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	112,799,218
Accumulated Depreciation	(24,613,974)
Investment in Real Estate, Net	88,185,244
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 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	9,165,718
Gross Amount Carried at close of period 12/31/2019, Land	6,510,200
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	48,855,838
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	55,366,038
Accumulated Depreciation	(36,158,521)
Investment in Real Estate, Net	19,207,517
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 31,381,614
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	4,181,605
Gross Amount Carried at close of period 12/31/2019, Land	35,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	112,949,803
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	148,149,803
Accumulated Depreciation	(29,876,521)
Investment in Real Estate, Net	118,273,282
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	$ 16,047,023
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	3,529,222
Gross Amount Carried at close of period 12/31/2019, Land	16,047,023
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	52,180,185
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	68,227,208
Accumulated Depreciation	(17,906,742)
Investment in Real Estate, Net	50,320,466
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 32,367,606
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	1,887,584
Gross Amount Carried at close of period 12/31/2019, Land	5,425,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	23,025,612
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	28,450,612
Accumulated Depreciation	(10,762,358)
Investment in Real Estate, Net	17,688,254
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 22,562,286
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	851,673
Gross Amount Carried at close of period 12/31/2019, Land	10,752,145
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	35,479,788
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	46,231,933
Accumulated Depreciation	(14,415,041)
Investment in Real Estate, Net	31,816,892
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 26,242,091
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	3,207,542
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	44,458,586
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	44,458,586
Accumulated Depreciation	(19,788,954)
Investment in Real Estate, Net	24,669,632
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 25,008,472
Lofts 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	785,733
Gross Amount Carried at close of period 12/31/2019, Land	20,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	68,694,756
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	88,794,756
Accumulated Depreciation	(18,393,776)
Investment in Real Estate, Net	70,400,980
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 42,942,461
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	10,395,783
Gross Amount Carried at close of period 12/31/2019, Land	20,880,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	100,651,292
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	121,531,292
Accumulated Depreciation	(49,137,968)
Investment in Real Estate, Net	72,393,324
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 84,192,433
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	2,455,932
Gross Amount Carried at close of period 12/31/2019, Land	8,540,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	14,665,913
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	23,205,913
Accumulated Depreciation	(7,193,891)
Investment in Real Estate, Net	16,012,022
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 21,468,471
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	1,903,142
Gross Amount Carried at close of period 12/31/2019, Land	12,649,228
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	38,745,154
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	51,394,382
Accumulated Depreciation	(14,892,031)
Investment in Real Estate, Net	36,502,351
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	13,628,927
Gross Amount Carried at close of period 12/31/2019, Land	71,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	225,536,068
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	297,436,068
Accumulated Depreciation	(64,679,195)
Investment in Real Estate, Net	$ 232,756,873
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
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	15,704,742
Gross Amount Carried at close of period 12/31/2019, Land	79,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	193,021,719
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	272,921,719
Accumulated Depreciation	(52,889,334)
Investment in Real Estate, Net	$ 220,032,385
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	99,319
Gross Amount Carried at close of period 12/31/2019, Land	7,222,544
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,376,775
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	33,599,319
Accumulated Depreciation	(6,486,674)
Investment in Real Estate, Net	$ 27,112,645
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
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	7,609,660
Gross Amount Carried at close of period 12/31/2019, Land	28,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	69,526,330
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	98,126,330
Accumulated Depreciation	(34,235,450)
Investment in Real Estate, Net	63,890,880
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 37,940,000
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	2,850,265
Gross Amount Carried at close of period 12/31/2019, Land	42,580,326
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	58,864,939
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	101,445,265
Accumulated Depreciation	(13,149,796)
Investment in Real Estate, Net	88,295,469
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 39,550,471
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	1,742,159
Gross Amount Carried at close of period 12/31/2019, Land	7,059,230
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	49,419,921
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	56,479,151
Accumulated Depreciation	(23,528,467)
Investment in Real Estate, Net	32,950,684
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 49,085,671
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	1,918,439
Gross Amount Carried at close of period 12/31/2019, Land	9,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	15,879,962
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	24,879,962
Accumulated Depreciation	(4,816,090)
Investment in Real Estate, Net	$ 20,063,872
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	4,230,586
Gross Amount Carried at close of period 12/31/2019, Land	60,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	52,424,423
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	113,324,423
Accumulated Depreciation	(16,852,716)
Investment in Real Estate, Net	96,471,707
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 48,684,032
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	3,178,513
Gross Amount Carried at close of period 12/31/2019, Land	22,898,848
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	136,645,671
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	159,544,519
Accumulated Depreciation	(42,104,815)
Investment in Real Estate, Net	117,439,704
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 96,409,896
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 12/31/2019, 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	$ 798,230,171
Investment in Real Estate - Wholly Owned Encumbered [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Units | ApartmentUnit	8,425
Initial Cost to Company, Land	$ 769,823,411
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,274,256,364
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	160,725,623
Gross Amount Carried at close of period 12/31/2019, Land	769,823,411
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	2,434,981,987
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	3,204,805,398
Accumulated Depreciation	(792,348,079)
Investment in Real Estate, Net	2,412,457,319
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 1,630,731,451
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	7,612,428
Gross Amount Carried at close of period 12/31/2019, Land	796,800
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	14,786,153
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	15,582,953
Accumulated Depreciation	(11,840,195)
Investment in Real Estate, Net	3,742,758
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
A9th & W [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Washington, DC
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	3,566,064
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	3,566,064
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	3,566,064
Accumulated Depreciation	0
Investment in Real Estate, Net	3,566,064
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	4,156,380
Gross Amount Carried at close of period 12/31/2019, Land	4,869,448
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	16,111,444
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	20,980,892
Accumulated Depreciation	(11,815,991)
Investment in Real Estate, Net	9,164,901
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	7,265,339
Gross Amount Carried at close of period 12/31/2019, Land	6,105,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	36,827,204
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	42,932,204
Accumulated Depreciation	(22,480,257)
Investment in Real Estate, Net	20,451,947
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	5,653,924
Gross Amount Carried at close of period 12/31/2019, Land	7,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	41,498,269
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	49,098,269
Accumulated Depreciation	(12,916,108)
Investment in Real Estate, Net	36,182,161
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	276,918
Gross Amount Carried at close of period 12/31/2019, Land	32,494,154
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	84,922,120
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	117,416,274
Accumulated Depreciation	(11,662,625)
Investment in Real Estate, Net	105,753,649
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	4,373,677
Gross Amount Carried at close of period 12/31/2019, Land	5,460,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	20,095,247
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	25,555,247
Accumulated Depreciation	(13,904,866)
Investment in Real Estate, Net	11,650,381
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	12,968,001
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,162,489
Gross Amount Carried at close of period 12/31/2019, Land	4,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	14,130,490
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	18,530,490
Accumulated Depreciation	(7,106,675)
Investment in Real Estate, Net	11,423,815
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	$ 26,626,497
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	226,783
Gross Amount Carried at close of period 12/31/2019, Land	26,626,497
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	151,878,831
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	178,505,328
Accumulated Depreciation	(15,894,448)
Investment in Real Estate, Net	162,610,880
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	9,286,416
Gross Amount Carried at close of period 12/31/2019, Land	5,055,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	47,675,088
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	52,730,088
Accumulated Depreciation	(25,490,323)
Investment in Real Estate, Net	27,239,765
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	$ 93,406,899
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	391,476,556
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	40,014,354
Gross Amount Carried at close of period 12/31/2019, Land	93,406,899
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	431,490,910
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	524,897,809
Accumulated Depreciation	(133,111,488)
Investment in Real Estate, Net	391,786,321
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Aero Apartments [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Alameda, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	0
Initial Cost to Company, Land	$ 13,107,242
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,347,948
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2019, Land	13,107,242
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,347,948
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	31,455,190
Accumulated Depreciation	0
Investment in Real Estate, Net	31,455,190
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 7,049,636
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	5,863,119
Gross Amount Carried at close of period 12/31/2019, Land	4,507,100
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,437,933
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	22,945,033
Accumulated Depreciation	(13,949,169)
Investment in Real Estate, Net	8,995,864
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 16,526,976
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	18,812,120
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	7,911,730
Gross Amount Carried at close of period 12/31/2019, Land	5,425,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,723,850
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	32,148,850
Accumulated Depreciation	(18,327,786)
Investment in Real Estate, Net	13,821,064
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 28,171,906
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	7,320,624
Gross Amount Carried at close of period 12/31/2019, Land	6,945,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	30,385,600
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	37,330,600
Accumulated Depreciation	(19,807,488)
Investment in Real Estate, Net	17,523,112
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 36,439,783
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	5,854,156
Gross Amount Carried at close of period 12/31/2019, Land	5,345,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,244,774
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	31,589,774
Accumulated Depreciation	(17,054,268)
Investment in Real Estate, Net	14,535,506
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 28,854,243
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	5,376,714
Gross Amount Carried at close of period 12/31/2019, Land	4,550,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	23,441,478
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	27,991,478
Accumulated Depreciation	(15,168,558)
Investment in Real Estate, Net	12,822,920
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 26,159,132
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	3,532,712
Gross Amount Carried at close of period 12/31/2019, Land	3,057,100
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	11,381,330
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	14,438,430
Accumulated Depreciation	(8,356,388)
Investment in Real Estate, Net	6,082,042
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 9,829,000
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	3,380,225
Gross Amount Carried at close of period 12/31/2019, Land	5,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,596,838
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	24,096,838
Accumulated Depreciation	(10,021,205)
Investment in Real Estate, Net	14,075,633
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 9,893,916
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	1,550,321
Gross Amount Carried at close of period 12/31/2019, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	173,639,676
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	173,639,676
Accumulated Depreciation	(48,686,702)
Investment in Real Estate, Net	124,952,974
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 147,953,509
Partially Owned Encumbered [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Units | ApartmentUnit	1,688
Initial Cost to Company, Land	$ 48,436,442
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	306,409,826
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	40,789,601
Gross Amount Carried at close of period 12/31/2019, Land	48,436,442
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	347,199,427
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	395,635,869
Accumulated Depreciation	(151,371,564)
Investment in Real Estate, Net	244,264,305
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 310,878,101
Total Consolidated Investment in Real Estate [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Units | ApartmentUnit	79,962
Initial Cost to Company, Land	$ 6,024,179,752
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	19,701,445,539
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,807,982,135
Gross Amount Carried at close of period 12/31/2019, Land	6,024,179,752
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	21,509,427,674
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	27,533,607,426
Accumulated Depreciation	(7,276,786,374)
Investment in Real Estate, Net	20,256,821,052
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 1,941,609,552

Schedule III - Real Estate an_7

Schedule III - Real Estate and Accumulated Depreciation (Parenthetical) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Real Estate And Accumulated Depreciation [Line Items]
Furniture, fixtures and equipment	$ 1,916,458,000	$ 1,722,231,000
Land and depreciable property net	13,700,000,000	$ 14,000,000,000
Depreciable Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Furniture, fixtures and equipment	$ 1,916,458,010
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