Erp Operating LTD Partnership 10-K 18 Feb 21 2020 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2020	Feb. 12, 2021	Jun. 30, 2020
Document Information [Line Items]
Entity Registrant Name	EQUITY RESIDENTIAL
Entity Central Index Key	0000906107
Document Type	10-K
Document Period End Date	Dec. 31, 2020
Amendment Flag	false
Document Fiscal Year Focus	2020
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			$ 21.7
Entity Common Stock, Shares Outstanding		372,663,215
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
ICFR Auditor Attestation Flag	true
Documents Incorporated by Reference	Part III incorporates by reference certain information that will be contained in Equity Residential’s Proxy Statement relating to its 2021 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, 2020, 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, 2020
Amendment Flag	false
Document Fiscal Year Focus	2020
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
ICFR Auditor Attestation Flag	true

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Land	$ 5,785,367	$ 5,936,188
Depreciable property	20,920,654	21,319,101
Projects under development	411,134	181,630
Land held for development	86,170	96,688
Investment in real estate	27,203,325	27,533,607
Accumulated depreciation	(7,859,657)	(7,276,786)
Investment in real estate, net	19,343,668	20,256,821
Investments in unconsolidated entities	52,782	52,238
Cash and cash equivalents	42,591	45,753
Restricted deposits	57,137	71,246
Right-of-use assets	499,287	512,774
Other assets	291,426	233,937
Total assets	20,286,891	21,172,769
Liabilities:
Mortgage notes payable, net	2,293,890	1,941,610
Notes, net	5,335,536	6,077,513
Line of credit and commercial paper	414,830	1,017,833
Accounts payable and accrued expenses	107,366	94,350
Accrued interest payable	65,896	66,852
Lease liabilities	329,130	331,334
Other liabilities	345,064	346,963
Security deposits	60,480	70,062
Distributions payable	232,262	218,326
Total liabilities	9,184,454	10,164,843
Commitments and contingencies
Redeemable Noncontrolling Interests – Operating Partnership	338,951	463,400
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, 2020 and December 31, 2019	37,280	37,280
Common Shares of beneficial interest, $0.01 par value; 1,000,000,000 shares authorized; 372,302,000 shares issued and outstanding as of December 31, 2020 and 371,670,884 shares issued and outstanding as of December 31, 2019	3,723	3,717
Paid in capital	9,128,599	8,965,577
Retained earnings	1,399,715	1,386,495
Accumulated other comprehensive income (loss)	(43,666)	(77,563)
Total shareholders’ equity	10,525,651	10,315,506
Noncontrolling Interests:
Operating Partnership	233,162	227,837
Partially Owned Properties	4,673	1,183
Total Noncontrolling Interests	237,835	229,020
Total equity	10,763,486	10,544,526
Total liabilities and equity/capital	$ 20,286,891	$ 21,172,769

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
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	372,302,000	371,670,884
Common Stock, Shares, Outstanding	372,302,000	371,670,884

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
REVENUES
Rental income	$ 2,571,705	$ 2,700,691	$ 2,577,681
EXPENSES
Property and maintenance	440,998	446,845	429,335
Real estate taxes and insurance	381,562	366,139	357,814
Property management	93,825	95,344	92,485
General and administrative	48,305	52,757	53,813
Depreciation	820,832	831,083	785,725
Total expenses	1,785,522	1,792,168	1,719,172
Net gain (loss) on sales of real estate properties	531,807	447,637	256,810
Impairment			(702)
Operating income	1,317,990	1,356,160	1,114,617
Interest and other income	5,935	3,201	16,070
Other expenses	(17,510)	(18,177)	(17,267)
Interest:
Expense incurred, net	(365,073)	(390,076)	(413,360)
Amortization of deferred financing costs	(8,939)	(11,670)	(11,310)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	932,403	939,438	688,750
Income and other tax (expense) benefit	(852)	2,281	(878)
Income (loss) from investments in unconsolidated entities	(3,284)	65,945	(3,667)
Net gain (loss) on sales of land parcels	34,234	2,044	987
Net income	962,501	1,009,708	685,192
Net (income) loss attributable to Noncontrolling Interests:
Operating Partnership	(34,010)	(36,034)	(24,939)
Partially Owned Properties	(14,855)	(3,297)	(2,718)
Net income attributable to controlling interests	913,636	970,377	657,535
Preferred distributions	(3,090)	(3,090)	(3,090)
Net income available to Common Shares	$ 910,546	$ 967,287	$ 654,445
Earnings per share – basic:
Net income available to Common Shares	$ 2.45	$ 2.61	$ 1.78
Weighted average Common Shares outstanding	371,791	370,461	368,052
Earnings per share – diluted:
Net income available to Common Shares	$ 2.45	$ 2.60	$ 1.77
Weighted average Common Shares outstanding	385,874	386,333	383,695

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Comprehensive income:
Net income	$ 962,501	$ 1,009,708	$ 685,192
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the year	(1,190)	(33,765)	5,174
Losses reclassified into earnings from other comprehensive income	35,087	21,188	18,452
Other comprehensive income (loss)	33,897	(12,577)	23,626
Comprehensive income	996,398	997,131	708,818
Comprehensive (income) attributable to Noncontrolling Interests	(50,084)	(38,872)	(28,526)
Comprehensive income attributable to controlling interests	$ 946,314	$ 958,259	$ 680,292

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 962,501	$ 1,009,708	$ 685,192
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	820,832	831,083	785,725
Amortization of deferred financing costs	8,939	11,670	11,310
Amortization of above/below market lease intangibles	(71)	(71)	4,392
Amortization of discounts and premiums on debt	5,231	11,780	22,781
Amortization of deferred settlements on derivative instruments	35,075	21,176	18,440
Amortization of right-of-use assets	11,682	11,764
Impairment			702
Write-off of pursuit costs	6,869	5,529	4,450
(Income) loss from investments in unconsolidated entities	3,284	(65,945)	3,667
Distributions from unconsolidated entities – return on capital	100	2,621	2,492
Net (gain) loss on sales of real estate properties	(531,807)	(447,637)	(256,810)
Net (gain) loss on sales of land parcels	(34,234)	(2,044)	(987)
Net (gain) loss on debt extinguishment	26,150	13,647	22,110
Realized/unrealized (gain) loss on derivative instruments	50		50
Compensation paid with Company Common Shares	23,174	24,449	27,132
Other operating activities, net	1,805	(287)
Changes in assets and liabilities:
(Increase) decrease in other assets	(53,021)	6,278	4,097
Increase (decrease) in accounts payable and accrued expenses	470	5,116	(1,862)
Increase (decrease) in accrued interest payable	(956)	4,230	4,587
Increase (decrease) in lease liabilities	(2,204)	(2,269)
Increase (decrease) in other liabilities	(8,751)	13,382	16,578
Increase (decrease) in security deposits	(9,582)	2,804	2,249
Net cash provided by operating activities	1,265,536	1,456,984	1,356,295
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(48,898)	(1,518,878)	(708,092)
Investment in real estate – development/other	(230,332)	(195,692)	(154,431)
Capital expenditures to real estate	(135,979)	(178,423)	(188,501)
Non-real estate capital additions	(20,100)	(4,955)	(4,505)
Interest capitalized for real estate under development	(10,165)	(6,884)	(6,260)
Proceeds from disposition of real estate, net	1,113,972	1,064,619	691,526
Investments in unconsolidated entities	(5,775)	(9,604)	(6,571)
Distributions from unconsolidated entities – return of capital	1,636	78,262
Purchase of investment securities and other investments	(773)	(269)
Net cash provided by (used for) investing activities	663,586	(771,824)	(376,834)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(2,923)	(19,812)	(8,583)
Proceeds	519,204	295,771	96,935
Lump sum payoffs	(160,522)	(743,021)	(1,347,939)
Scheduled principal repayments	(7,759)	(6,808)	(6,629)
Proceeds		1,194,468	896,294
Lump sum payoffs	(750,000)	(1,050,000)
Line of credit and commercial paper:
Line of credit proceeds	1,870,000	6,010,000	3,805,000
Line of credit repayments	(1,890,000)	(5,990,000)	(3,805,000)
Commercial paper proceeds	7,450,997	15,944,800	14,030,926
Commercial paper repayments	(8,034,000)	(15,446,150)	(13,831,500)
Proceeds from (payments on) settlement of derivative instruments	(1,240)	(41,616)	18,118
Prepaid finance ground lease		(34,734)
Proceeds from Employee Share Purchase Plan (ESPP)	4,508	3,116	3,879
Proceeds from exercise of options	12,275	77,785	30,655
Payment of offering costs		(991)	(27)
Other financing activities, net	(63)	(80)	(78)
Acquisition of Noncontrolling Interests – Partially Owned Properties			(13)
Contributions – Noncontrolling Interests – Partially Owned Properties	417	7,337	125
Contributions – Noncontrolling Interests – Operating Partnership	13	2	1
Distributions:
Common Shares	(883,938)	(831,111)	(782,122)
Preferred Shares	(3,090)	(3,090)	(3,863)
Noncontrolling Interests – Operating Partnership	(32,403)	(29,615)	(28,226)
Noncontrolling Interests – Partially Owned Properties	(11,719)	(7,078)	(9,753)
Net cash provided by (used for) financing activities	(1,946,393)	(684,474)	(963,910)
Net increase (decrease) in cash and cash equivalents and restricted deposits	(17,271)	686	15,551
Cash and cash equivalents and restricted deposits, beginning of year	116,999	116,313	100,762
Cash and cash equivalents and restricted deposits, end of year	99,728	116,999	116,313
Cash and cash equivalents	42,591	45,753	47,442
Restricted deposits	57,137	71,246	68,871
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	320,854	342,048	358,156
Net cash paid (received) for income and other taxes	(1,038)	(585)	853
Amortization of deferred financing costs:
Investment in real estate, net	(240)	(120)
Other assets	2,338	2,987	2,412
Mortgage notes payable, net	1,815	3,934	4,792
Notes, net	5,026	4,869	4,106
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	2,234	8,618	20,144
Notes, net	2,997	3,162	2,637
Amortization of deferred settlements on derivative instruments:
Other liabilities	(12)	(12)	(12)
Accumulated other comprehensive income	35,087	21,188	18,452
Write-off of pursuit costs:
Investment in real estate, net	6,566	5,451	4,364
Other assets	271	62	53
Accounts payable and accrued expenses	32	16	33
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	1,995	(67,268)	2,304
Other liabilities	1,289	1,323	1,363
Realized/unrealized (gain) loss on derivative instruments:
Other assets		2,002	(14,977)
Notes, net		2,277	(680)
Other liabilities	1,240	29,486	10,533
Accumulated other comprehensive income	(1,190)	(33,765)	5,174
Investments in unconsolidated entities:
Investments in unconsolidated entities	(4,275)	(7,504)	(4,891)
Other liabilities	(1,500)	(2,100)	(1,680)
Debt financing costs:
Other assets	(231)	(6,909)	(145)
Mortgage notes payable, net	(2,692)	(2,354)	(555)
Notes, net		(10,549)	(7,883)
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
Other liabilities	(1,240)	(41,616)
Mortgage Notes Payable, Net [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Net gain (loss) on debt extinguishment	(327)	(3,381)	$ (22,110)
Notes, Net [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Net gain (loss) on debt extinguishment	$ (25,823)	$ (10,266)

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, 2017		$ 37,280	$ 3,680	$ 8,886,586	$ 1,403,530	$ (88,612)
Balance, beginning of year at Dec. 31, 2017								$ 226,691	$ 4,708
Conversion of OP Units into Common Shares			1	4,097
Exercise of share options			11	30,644
Employee Share Purchase Plan (ESPP)	$ 3,879		1	3,878
Issuance of restricted units/shares			1	8,257				1
Share options				9,734
ESPP discount				767
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
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
Acquisitions of Noncontrolling Interests – Partially Owned Properties									(13)
Contributions by Noncontrolling Interests									125
Distributions to Noncontrolling Interests								(28,682)	(9,831)
Change in carrying value of Redeemable Noncontrolling Interests –Operating Partnership	(1,771)							1,771
Balance, end of year at Dec. 31, 2018		37,280	3,694	8,935,453	1,261,763	(64,986)
Balance, end of year at Dec. 31, 2018								228,738	(2,293)
Conversion of OP Units into Common Shares			3	10,407
Exercise of share options			17	77,768
Employee Share Purchase Plan (ESPP)	3,116		1	3,115
Issuance of restricted units/shares			2	12,436				2
Share options				2,675
ESPP discount				642
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
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
Contributions by Noncontrolling Interests									7,337
Distributions to Noncontrolling Interests								(29,896)	(7,158)
Change in carrying value of Redeemable Noncontrolling Interests –Operating Partnership	2,011							(2,011)
Balance, end of year at Dec. 31, 2019	10,315,506	37,280	3,717	8,965,577	1,386,495	(77,563)
Balance, end of year at Dec. 31, 2019	229,020							227,837	1,183
Conversion of OP Units into Common Shares			1	4,695
Exercise of share options			2	12,273
Employee Share Purchase Plan (ESPP)	4,508		1	4,507
Issuance of restricted units/shares			2	11,223				13
Share options				2,349
ESPP discount				944
Supplemental Executive Retirement Plan (SERP)				(395)
Change in market value of Redeemable Noncontrolling Interests –Operating Partnership	(125,224)			125,224
Adjustment for Noncontrolling Interests ownership in Operating Partnership				2,202				(2,202)
Net income attributable to controlling interests	913,636				913,636
Common Share distributions					(897,326)
Preferred Share distributions					(3,090)
Unrealized holding gains (losses) arising during the year	(1,190)					(1,190)
Losses reclassified into earnings from other comprehensive income	(35,087)					35,087
Distributions declared per Common Share outstanding							$ 2.41
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(4,696)
Equity compensation associated with Noncontrolling Interests								11,926
Net income attributable to Noncontrolling Interests	34,010							34,010	14,855
Contributions by Noncontrolling Interests									417
Distributions to Noncontrolling Interests								(32,951)	(11,782)
Change in carrying value of Redeemable Noncontrolling Interests –Operating Partnership	775							(775)
Balance, end of year at Dec. 31, 2020	10,525,651	$ 37,280	$ 3,723	$ 9,128,599	$ 1,399,715	$ (43,666)
Balance, end of year at Dec. 31, 2020	$ 237,835							$ 233,162	$ 4,673

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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, 2020	Dec. 31, 2019
ASSETS
Land	$ 5,785,367	$ 5,936,188
Depreciable property	20,920,654	21,319,101
Projects under development	411,134	181,630
Land held for development	86,170	96,688
Investment in real estate	27,203,325	27,533,607
Accumulated depreciation	(7,859,657)	(7,276,786)
Investment in real estate, net	19,343,668	20,256,821
Investments in unconsolidated entities	52,782	52,238
Cash and cash equivalents	42,591	45,753
Restricted deposits	57,137	71,246
Right-of-use assets	499,287	512,774
Other assets	291,426	233,937
Total assets	20,286,891	21,172,769
Liabilities:
Mortgage notes payable, net	2,293,890	1,941,610
Notes, net	5,335,536	6,077,513
Line of credit and commercial paper	414,830	1,017,833
Accounts payable and accrued expenses	107,366	94,350
Accrued interest payable	65,896	66,852
Lease liabilities	329,130	331,334
Other liabilities	345,064	346,963
Security deposits	60,480	70,062
Distributions payable	232,262	218,326
Total liabilities	9,184,454	10,164,843
Commitments and contingencies
Redeemable Limited Partners	338,951	463,400
Partners’ Capital:
Accumulated other comprehensive income (loss)	(43,666)	(77,563)
Noncontrolling Interests – Partially Owned Properties	4,673	1,183
Total liabilities and equity/capital	20,286,891	21,172,769
ERPOP [Member]
ASSETS
Land	5,785,367	5,936,188
Depreciable property	20,920,654	21,319,101
Projects under development	411,134	181,630
Land held for development	86,170	96,688
Investment in real estate	27,203,325	27,533,607
Accumulated depreciation	(7,859,657)	(7,276,786)
Investment in real estate, net	19,343,668	20,256,821
Investments in unconsolidated entities	52,782	52,238
Cash and cash equivalents	42,591	45,753
Restricted deposits	57,137	71,246
Right-of-use assets	499,287	512,774
Other assets	291,426	233,937
Total assets	20,286,891	21,172,769
Liabilities:
Mortgage notes payable, net	2,293,890	1,941,610
Notes, net	5,335,536	6,077,513
Line of credit and commercial paper	414,830	1,017,833
Accounts payable and accrued expenses	107,366	94,350
Accrued interest payable	65,896	66,852
Lease liabilities	329,130	331,334
Other liabilities	345,064	346,963
Security deposits	60,480	70,062
Distributions payable	232,262	218,326
Total liabilities	9,184,454	10,164,843
Commitments and contingencies
Redeemable Limited Partners	338,951	463,400
Partners’ Capital:
Preference Units	37,280	37,280
General Partner	10,532,037	10,355,789
Limited Partners	233,162	227,837
Accumulated other comprehensive income (loss)	(43,666)	(77,563)
Total partners’ capital	10,758,813	10,543,343
Noncontrolling Interests – Partially Owned Properties	4,673	1,183
Total capital	10,763,486	10,544,526
Total liabilities and equity/capital	$ 20,286,891	$ 21,172,769

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, 2020	Dec. 31, 2019	Dec. 31, 2018
REVENUES
Rental income	$ 2,571,705	$ 2,700,691	$ 2,577,681
EXPENSES
Property and maintenance	440,998	446,845	429,335
Real estate taxes and insurance	381,562	366,139	357,814
Property management	93,825	95,344	92,485
General and administrative	48,305	52,757	53,813
Depreciation	820,832	831,083	785,725
Total expenses	1,785,522	1,792,168	1,719,172
Net gain (loss) on sales of real estate properties	531,807	447,637	256,810
Impairment			(702)
Operating income	1,317,990	1,356,160	1,114,617
Interest and other income	5,935	3,201	16,070
Other expenses	(17,510)	(18,177)	(17,267)
Interest:
Expense incurred, net	(365,073)	(390,076)	(413,360)
Amortization of deferred financing costs	(8,939)	(11,670)	(11,310)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	932,403	939,438	688,750
Income and other tax (expense) benefit	(852)	2,281	(878)
Income (loss) from investments in unconsolidated entities	(3,284)	65,945	(3,667)
Net gain (loss) on sales of land parcels	34,234	2,044	987
Net income	962,501	1,009,708	685,192
Partially Owned Properties	(14,855)	(3,297)	(2,718)
Net income attributable to controlling interests	$ 913,636	$ 970,377	$ 657,535
Earnings per Unit – basic:
Net income available to Units	$ 2.45	$ 2.61	$ 1.78
Earnings per Unit – diluted:
Net income available to Units	$ 2.45	$ 2.60	$ 1.77
Weighted average Units outstanding	385,874	386,333	383,695
ERPOP [Member]
REVENUES
Rental income	$ 2,571,705	$ 2,700,691	$ 2,577,681
EXPENSES
Property and maintenance	440,998	446,845	429,335
Real estate taxes and insurance	381,562	366,139	357,814
Property management	93,825	95,344	92,485
General and administrative	48,305	52,757	53,813
Depreciation	820,832	831,083	785,725
Total expenses	1,785,522	1,792,168	1,719,172
Net gain (loss) on sales of real estate properties	531,807	447,637	256,810
Impairment			(702)
Operating income	1,317,990	1,356,160	1,114,617
Interest and other income	5,935	3,201	16,070
Other expenses	(17,510)	(18,177)	(17,267)
Interest:
Expense incurred, net	(365,073)	(390,076)	(413,360)
Amortization of deferred financing costs	(8,939)	(11,670)	(11,310)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	932,403	939,438	688,750
Income and other tax (expense) benefit	(852)	2,281	(878)
Income (loss) from investments in unconsolidated entities	(3,284)	65,945	(3,667)
Net gain (loss) on sales of land parcels	34,234	2,044	987
Net income	962,501	1,009,708	685,192
Partially Owned Properties	(14,855)	(3,297)	(2,718)
Net income attributable to controlling interests	947,646	1,006,411	682,474
ALLOCATION OF NET INCOME:
Preference Units	3,090	3,090	3,090
General Partner	910,546	967,287	654,445
Limited Partners	34,010	36,034	24,939
Net income available to Units	$ 944,556	$ 1,003,321	$ 679,384
Earnings per Unit – basic:
Net income available to Units	$ 2.45	$ 2.61	$ 1.78
Weighted average Units outstanding	384,794	383,368	380,921
Earnings per Unit – diluted:
Net income available to Units	$ 2.45	$ 2.60	$ 1.77
Weighted average Units outstanding	385,874	386,333	383,695

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Comprehensive income:
Net income	$ 962,501	$ 1,009,708	$ 685,192
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the year	(1,190)	(33,765)	5,174
Losses reclassified into earnings from other comprehensive income	35,087	21,188	18,452
Other comprehensive income (loss)	33,897	(12,577)	23,626
Comprehensive income	996,398	997,131	708,818
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(50,084)	(38,872)	(28,526)
Comprehensive income attributable to controlling interests	946,314	958,259	680,292
ERPOP [Member]
Comprehensive income:
Net income	962,501	1,009,708	685,192
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the year	(1,190)	(33,765)	5,174
Losses reclassified into earnings from other comprehensive income	35,087	21,188	18,452
Other comprehensive income (loss)	33,897	(12,577)	23,626
Comprehensive income	996,398	997,131	708,818
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(14,855)	(3,297)	(2,718)
Comprehensive income attributable to controlling interests	$ 981,543	$ 993,834	$ 706,100

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS OF ERP OPERATING LIMITED PARTNERSHIP - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 962,501	$ 1,009,708	$ 685,192
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	820,832	831,083	785,725
Amortization of deferred financing costs	8,939	11,670	11,310
Amortization of above/below market lease intangibles	(71)	(71)	4,392
Amortization of discounts and premiums on debt	5,231	11,780	22,781
Amortization of deferred settlements on derivative instruments	35,075	21,176	18,440
Amortization of right-of-use assets	11,682	11,764
Impairment			702
Write-off of pursuit costs	6,869	5,529	4,450
(Income) loss from investments in unconsolidated entities	3,284	(65,945)	3,667
Distributions from unconsolidated entities – return on capital	100	2,621	2,492
Net (gain) loss on sales of real estate properties	(531,807)	(447,637)	(256,810)
Net (gain) loss on sales of land parcels	(34,234)	(2,044)	(987)
Net (gain) loss on debt extinguishment	26,150	13,647	22,110
Realized/unrealized (gain) loss on derivative instruments	50		50
Compensation paid with Company Common Shares	23,174	24,449	27,132
Other operating activities, net	1,805	(287)
Changes in assets and liabilities:
(Increase) decrease in other assets	(53,021)	6,278	4,097
Increase (decrease) in accounts payable and accrued expenses	470	5,116	(1,862)
Increase (decrease) in accrued interest payable	(956)	4,230	4,587
Increase (decrease) in lease liabilities	(2,204)	(2,269)
Increase (decrease) in other liabilities	(8,751)	13,382	16,578
Increase (decrease) in security deposits	(9,582)	2,804	2,249
Net cash provided by operating activities	1,265,536	1,456,984	1,356,295
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(48,898)	(1,518,878)	(708,092)
Investment in real estate – development/other	(230,332)	(195,692)	(154,431)
Capital expenditures to real estate	(135,979)	(178,423)	(188,501)
Non-real estate capital additions	(20,100)	(4,955)	(4,505)
Interest capitalized for real estate under development	(10,165)	(6,884)	(6,260)
Proceeds from disposition of real estate, net	1,113,972	1,064,619	691,526
Investments in unconsolidated entities	(5,775)	(9,604)	(6,571)
Distributions from unconsolidated entities – return of capital	1,636	78,262
Purchase of investment securities and other investments	(773)	(269)
Net cash provided by (used for) investing activities	663,586	(771,824)	(376,834)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(2,923)	(19,812)	(8,583)
Proceeds	519,204	295,771	96,935
Lump sum payoffs	(160,522)	(743,021)	(1,347,939)
Scheduled principal repayments	(7,759)	(6,808)	(6,629)
Proceeds		1,194,468	896,294
Lump sum payoffs	(750,000)	(1,050,000)
Line of credit and commercial paper:
Line of credit proceeds	1,870,000	6,010,000	3,805,000
Line of credit repayments	(1,890,000)	(5,990,000)	(3,805,000)
Commercial paper proceeds	7,450,997	15,944,800	14,030,926
Commercial paper repayments	(8,034,000)	(15,446,150)	(13,831,500)
Proceeds from (payments on) settlement of derivative instruments	(1,240)	(41,616)	18,118
Prepaid finance ground lease		(34,734)
Proceeds from Employee Share Purchase Plan (ESPP)	4,508	3,116	3,879
Proceeds from exercise of EQR options	12,275	77,785	30,655
Payment of offering costs		(991)	(27)
Other financing activities, net	(63)	(80)	(78)
Acquisition of Noncontrolling Interests – Partially Owned Properties			(13)
Contributions – Noncontrolling Interests – Partially Owned Properties	417	7,337	125
Contributions – Limited Partners	13	2	1
Distributions:
OP Units – General Partner	(883,938)	(831,111)	(782,122)
Preference Units	(3,090)	(3,090)	(3,863)
OP Units – Limited Partners	(32,403)	(29,615)	(28,226)
Noncontrolling Interests – Partially Owned Properties	(11,719)	(7,078)	(9,753)
Net cash provided by (used for) financing activities	(1,946,393)	(684,474)	(963,910)
Net increase (decrease) in cash and cash equivalents and restricted deposits	(17,271)	686	15,551
Cash and cash equivalents and restricted deposits, beginning of year	116,999	116,313	100,762
Cash and cash equivalents and restricted deposits, end of year	99,728	116,999	116,313
Cash and cash equivalents	42,591	45,753	47,442
Restricted deposits	57,137	71,246	68,871
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	320,854	342,048	358,156
Net cash paid (received) for income and other taxes	(1,038)	(585)	853
Amortization of deferred financing costs:
Investment in real estate, net	(240)	(120)
Other assets	2,338	2,987	2,412
Mortgage notes payable, net	1,815	3,934	4,792
Notes, net	5,026	4,869	4,106
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	2,234	8,618	20,144
Notes, net	2,997	3,162	2,637
Amortization of deferred settlements on derivative instruments:
Other liabilities	(12)	(12)	(12)
Accumulated other comprehensive income	35,087	21,188	18,452
Write-off of pursuit costs:
Investment in real estate, net	6,566	5,451	4,364
Other assets	271	62	53
Accounts payable and accrued expenses	32	16	33
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	1,995	(67,268)	2,304
Other liabilities	1,289	1,323	1,363
Realized/unrealized (gain) loss on derivative instruments:
Other assets		2,002	(14,977)
Notes, net		2,277	(680)
Other liabilities	1,240	29,486	10,533
Accumulated other comprehensive income	(1,190)	(33,765)	5,174
Investments in unconsolidated entities:
Investments in unconsolidated entities	(4,275)	(7,504)	(4,891)
Other liabilities	(1,500)	(2,100)	(1,680)
Debt financing costs:
Other assets	(231)	(6,909)	(145)
Mortgage notes payable, net	(2,692)	(2,354)	(555)
Notes, net		(10,549)	(7,883)
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
Other liabilities	(1,240)	(41,616)
Mortgage Notes Payable, Net [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Net gain (loss) on debt extinguishment	(327)	(3,381)	(22,110)
Notes, Net [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Net gain (loss) on debt extinguishment	(25,823)	(10,266)
ERPOP [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	962,501	1,009,708	685,192
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	820,832	831,083	785,725
Amortization of deferred financing costs	8,939	11,670	11,310
Amortization of above/below market lease intangibles	(71)	(71)	4,392
Amortization of discounts and premiums on debt	5,231	11,780	22,781
Amortization of deferred settlements on derivative instruments	35,075	21,176	18,440
Amortization of right-of-use assets	11,682	11,764
Impairment			702
Write-off of pursuit costs	6,869	5,529	4,450
(Income) loss from investments in unconsolidated entities	3,284	(65,945)	3,667
Distributions from unconsolidated entities – return on capital	100	2,621	2,492
Net (gain) loss on sales of real estate properties	(531,807)	(447,637)	(256,810)
Net (gain) loss on sales of land parcels	(34,234)	(2,044)	(987)
Net (gain) loss on debt extinguishment	26,150	13,647	22,110
Realized/unrealized (gain) loss on derivative instruments	50		50
Compensation paid with Company Common Shares	23,174	24,449	27,132
Other operating activities, net	1,805	(287)
Changes in assets and liabilities:
(Increase) decrease in other assets	(53,021)	6,278	4,097
Increase (decrease) in accounts payable and accrued expenses	470	5,116	(1,862)
Increase (decrease) in accrued interest payable	(956)	4,230	4,587
Increase (decrease) in lease liabilities	(2,204)	(2,269)
Increase (decrease) in other liabilities	(8,751)	13,382	16,578
Increase (decrease) in security deposits	(9,582)	2,804	2,249
Net cash provided by operating activities	1,265,536	1,456,984	1,356,295
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(48,898)	(1,518,878)	(708,092)
Investment in real estate – development/other	(230,332)	(195,692)	(154,431)
Capital expenditures to real estate	(135,979)	(178,423)	(188,501)
Non-real estate capital additions	(20,100)	(4,955)	(4,505)
Interest capitalized for real estate under development	(10,165)	(6,884)	(6,260)
Proceeds from disposition of real estate, net	1,113,972	1,064,619	691,526
Investments in unconsolidated entities	(5,775)	(9,604)	(6,571)
Distributions from unconsolidated entities – return of capital	1,636	78,262
Purchase of investment securities and other investments	(773)	(269)
Net cash provided by (used for) investing activities	663,586	(771,824)	(376,834)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(2,923)	(19,812)	(8,583)
Proceeds	519,204	295,771	96,935
Lump sum payoffs	(160,522)	(743,021)	(1,347,939)
Scheduled principal repayments	(7,759)	(6,808)	(6,629)
Proceeds		1,194,468	896,294
Lump sum payoffs	(750,000)	(1,050,000)
Line of credit and commercial paper:
Line of credit proceeds	1,870,000	6,010,000	3,805,000
Line of credit repayments	(1,890,000)	(5,990,000)	(3,805,000)
Commercial paper proceeds	7,450,997	15,944,800	14,030,926
Commercial paper repayments	(8,034,000)	(15,446,150)	(13,831,500)
Proceeds from (payments on) settlement of derivative instruments	(1,240)	(41,616)	18,118
Prepaid finance ground lease		(34,734)
Proceeds from Employee Share Purchase Plan (ESPP)	4,508	3,116	3,879
Proceeds from exercise of EQR options	12,275	77,785	30,655
Payment of offering costs		(991)	(27)
Other financing activities, net	(63)	(80)	(78)
Acquisition of Noncontrolling Interests – Partially Owned Properties			(13)
Contributions – Noncontrolling Interests – Partially Owned Properties	417	7,337	125
Contributions – Limited Partners	13	2	1
Distributions:
OP Units – General Partner	(883,938)	(831,111)	(782,122)
Preference Units	(3,090)	(3,090)	(3,863)
OP Units – Limited Partners	(32,403)	(29,615)	(28,226)
Noncontrolling Interests – Partially Owned Properties	(11,719)	(7,078)	(9,753)
Net cash provided by (used for) financing activities	(1,946,393)	(684,474)	(963,910)
Net increase (decrease) in cash and cash equivalents and restricted deposits	(17,271)	686	15,551
Cash and cash equivalents and restricted deposits, beginning of year	116,999	116,313	100,762
Cash and cash equivalents and restricted deposits, end of year	99,728	116,999	116,313
Cash and cash equivalents	42,591	45,753	47,442
Restricted deposits	57,137	71,246	68,871
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	320,854	342,048	358,156
Net cash paid (received) for income and other taxes	(1,038)	(585)	853
Amortization of deferred financing costs:
Investment in real estate, net	(240)	(120)
Other assets	2,338	2,987	2,412
Mortgage notes payable, net	1,815	3,934	4,792
Notes, net	5,026	4,869	4,106
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	2,234	8,618	20,144
Notes, net	2,997	3,162	2,637
Amortization of deferred settlements on derivative instruments:
Other liabilities	(12)	(12)	(12)
Accumulated other comprehensive income	35,087	21,188	18,452
Write-off of pursuit costs:
Investment in real estate, net	6,566	5,451	4,364
Other assets	271	62	53
Accounts payable and accrued expenses	32	16	33
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	1,995	(67,268)	2,304
Other liabilities	1,289	1,323	1,363
Realized/unrealized (gain) loss on derivative instruments:
Other assets		2,002	(14,977)
Notes, net		2,277	(680)
Other liabilities	1,240	29,486	10,533
Accumulated other comprehensive income	(1,190)	(33,765)	5,174
Investments in unconsolidated entities:
Investments in unconsolidated entities	(4,275)	(7,504)	(4,891)
Other liabilities	(1,500)	(2,100)	(1,680)
Debt financing costs:
Other assets	(231)	(6,909)	(145)
Mortgage notes payable, net	(2,692)	(2,354)	(555)
Notes, net		(10,549)	(7,883)
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
Other liabilities	(1,240)	(41,616)
ERPOP [Member] | Mortgage Notes Payable, Net [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Net gain (loss) on debt extinguishment	(327)	(3,381)	$ (22,110)
ERPOP [Member] | Notes, Net [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Net gain (loss) on debt extinguishment	$ (25,823)	$ (10,266)

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]ERPOP [Member]	Limited PartnerERPOP [Member]	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)ERPOP [Member]	DISTRIBUTIONS [Member]	PARTIALLY OWNED PROPERTIES [Member]ERPOP [Member]
Balance, beginning of year at Dec. 31, 2017			$ 37,280	$ 10,293,796	$ 226,691	$ (88,612)
Balance, beginning of year at Dec. 31, 2017								$ 4,708
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
EQR restricted shares				8,258	1
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)
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
Unrealized holding gains (losses) arising during the year	2,718	2,718				5,174
Losses reclassified into earnings from other comprehensive income	(18,452)	(18,452)				18,452
Distributions declared per Unit outstanding							$ 2.16
Net income attributable to Noncontrolling Interests	685,192	685,192						2,718
Acquisitions of 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)
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
EQR restricted shares				12,438	2
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)
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)
Unrealized holding gains (losses) arising during the year	3,297	3,297				(33,765)
Losses reclassified into earnings from other comprehensive income	(21,188)	(21,188)				21,188
Distributions declared per Unit outstanding							2.27
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
Conversion of OP Units held by Limited Partners into OP Units held by General Partner				4,696	(4,696)
Exercise of EQR share options				12,275
EQR's Employee Share Purchase Plan (ESPP)	4,508
EQR restricted shares				11,225	13
EQR share options				2,349
EQR ESPP discount				944
Net income available to Units - General Partner		910,546		910,546
OP Units - General Partner distributions				(897,326)
Supplemental Executive Retirement Plan (SERP)				(395)
Change in market value of Redeemable Limited Partners				125,224
Adjustment for Limited Partners ownership in Operating Partnership				2,202	(2,202)
Equity compensation associated with Units - Limited Partners					11,926
Net income available to Units - Limited Partners		34,010			34,010
Units - Limited Partners distributions					(32,951)
Change in carrying value of Redeemable Limited Partners					(775)
Unrealized holding gains (losses) arising during the year	14,855	14,855				(1,190)
Losses reclassified into earnings from other comprehensive income	(35,087)	(35,087)				35,087
Distributions declared per Unit outstanding							$ 2.41
Net income attributable to Noncontrolling Interests	$ 962,501	$ 962,501						14,855
Contributions by Noncontrolling Interests								417
Distributions to Noncontrolling Interests								(11,782)
Balance, end of year at Dec. 31, 2020			$ 37,280	$ 10,532,037	$ 233,162	$ (43,666)
Balance, end of year at Dec. 31, 2020								$ 4,673

Business

Business	12 Months Ended
	Dec. 31, 2020
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 residential properties located in and around dynamic cities that attract high quality long-term renters, 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, 2020 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, 2020, the Company, directly or indirectly through investments in title holding entities, owned all or a portion of 304 properties located in 9 states and the District of Columbia consisting of 77,889 apartment units. The ownership breakdown includes (table does not include various uncompleted development properties): Properties Apartment Units Wholly Owned Properties 287 74,328 Master-Leased Property – Consolidated 1 162 Partially Owned Properties – Consolidated 16 3,399 304 77,889 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. COVID-19 Pandemic The continued rapid development and fast-changing nature of the novel coronavirus (“COVID-19”) pandemic creates many unknowns that have had and could continue to have a significant future impact on the Company. Its duration, severity and the extent of the adverse health impact on the general population, our residents and employees, the rollout and effectiveness of vaccines and the potential long-term changes in customer preferences for living in our communities, are among the many unknowns. These, among other items, have impacted the economy, the unemployment rate and our operations and could materially affect our future consolidated results of operations, financial condition, liquidity, investments and overall performance.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
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, 2020 and 2019, 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 $15,000 and $40,000 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 non-residential leases’ term at acquisition approximates the average remaining term of all acquired non-residential 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 At least quarterly, the Company 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 an impairment indicator exists, 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. Impairment of Investments in Unconsolidated Entities At least quarterly, the Company evaluates its investments in unconsolidated entities, including any multifamily real estate assets held by a joint venture, for indicators of other than temporary impairment, considering whether there has been a change to events or circumstances that would impact recoverability of the Company’s investment as well as any changes with regards to the Company's intent and ability to hold the investment to recover its carrying value. Cost Capitalization See the Real Estate Assets and Depreciation of Investment in Real Estate During the years ended December 31, 2020, 2019 and 2018, the Company capitalized $12.1 million, $14.2 million and $13.2 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 non-residential leases is also recorded on a straight-line basis. Non-residential 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, non-residential and other lease income, which are accounted for under the lease standard effective January 1, 2019 (discussed below in Recently Adopted Accounting Pronouncements The Company is a lessor for its residential and non-residential 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 lease 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 lease 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 lease 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. • 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. See Note 8 for the Company’s rental income detail allocated between the lease and revenue recognition standards. The Company’s allowance for doubtful accounts (which offsets accounts receivable and is included within other assets on the consolidated balance sheets) and bad debt s (which reduce rental income on the consolidated statements of operations and comprehensive income) have historically been very modest, particularly in our residential business, given the quality of our resident base and asset class . However , due to the impact of the COVID-19 pandemic, the allowance for doubtful accounts and bad debt s became elevated during 2020 and will likely remain elevated in 2021 . In accordance with the lease standard, if we determine the lease payments are not probable of collection ( based on known troubled accounts, rent deferral plans granted, historical experience and other currently available evidence ) , we fully reserve for any unpaid amounts , deferred rent receivable, variable lease payments and straight-line receivable balances and recognize rental income only if cash is received. If the Company’s estimates of collectibility differ from the cash received, then the timing and amount of the Company’s reported revenue could be impacted. See Note 8 for additional details. Share-Based Compensation The Company expenses share-based compensation for employee and trustee grants of 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. 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 at the EQR level. In addition, ERPOP generally is not liable for federal income taxes as the partners recognize their allocable 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. On March 27, 2020, the President signed into law the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”). The CARES Act was enacted to provide economic relief to companies and individuals in response to the COVID-19 pandemic. Included in the CARES Act are tax provisions which increase allowable interest expense deductions for 2019 and 2020 and increase the ability for taxpayers to use net operating losses. These provisions did not result in a material impact to the Company’s taxable income or tax liabilities. The CARES Act also allowed corporations to request accelerated refunds of their alternative minimum tax (“AMT”) credit. Prior to enactment of this provision, the remaining credits would have been refunded in installments in 2020, 2021 and 2022. We received a refund of our remaining $1.6 million in AMT credits during the year ended December 31, 2020. The Company’s provision for income and other tax expense (benefit) was as follows for the years ended December 31, 2020, 2019 and 2018 (amounts in thousands): Year Ended December 31, 2020 2019 2018 State and local income, franchise and excise tax (benefit) $ 852 $ 963 $ 878 Alternative minimum tax credit (benefit) (1) — (3,244 ) — Income and other tax expense (benefit) (2) $ 852 $ (2,281 ) $ 878 (1) As provided in recent tax legislation which repealed the AMT credit on corporations, in 2019 the Company claimed/received $1.6 million of refunds of various AMT credit carryovers generated in prior tax years. The provision originally allowed for carryover amounts to be refunded over four years, with 50% available in the first year. The remaining $1.6 million was received in 2020 as noted above. (2) All provisions for income tax amounts are current and none are deferred. During the years ended December 31, 2020, 2019 and 2018, the tax character of the Company’s dividends and distributions were as follows (unaudited): Year Ended December 31, 2020 (1) 2019 (2) 2018 (3) Tax character of dividends and distributions: Ordinary dividends $ 1.34739 $ 1.39604 $ 1.84454 Long-term capital gain 0.77923 0.61243 0.21423 Unrecaptured section 1250 gain 0.24838 0.23403 0.06498 Dividends and distributions per Common Share/Unit outstanding $ 2.37500 $ 2.24250 $ 2.12375 (1) The Company’s fourth quarter 2020 dividends and distributions of $0.6025 per Common Share/Unit outstanding will be included as taxable income in calendar year 2021. (2) The Company’s fourth quarter 2019 dividends and distributions of $0.5675 per Common Share/Unit outstanding was included as taxable income in calendar year 2020. (3 ) 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. The unaudited cost of land and depreciable property, net of accumulated depreciation, for federal income tax purposes as of December 31, 2020 and 2019 was approximately $13.8 billion and $13.7 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. In response to the COVID-19 pandemic, management evaluated whether its estimates, such as lease collectibility (discussed below in Recently Adopted Accounting Pronouncements 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 August 2020, the Financial Accounting Standards Board (“FASB”) issued an amendment to the debt and equity financial instruments standards which simplifies the accounting for convertible instruments and accounting for contracts in an entity’s own equity. Instead of being required to assess whether an equity contract permits settlement in unregistered shares, which may require a legal analysis under the securities laws, entities will only analyze whether cash settlements are explicitly required when registered shares are unavailable. As a result, such contracts may be classified in permanent rather than mezzanine equity, which may affect the way the Company’s OP Units are presented on its financial statements. The update is effective for the Company beginning on January 1, 2022, but early adoption is allowed beginning January 1, 2021. The Company is currently evaluating the impact of adopting the new standard on its consolidated results of operations and financial position. In March 2020, the FASB issued an amendment to the reference rate reform standard which provides the option for a limited period of time to ease the potential burden in accounting for, or recognizing the effects of, reference rate reform on contract modifications and hedge accounting. An example of such reform is the expected market transition from the London Interbank Offered Rate (“LIBOR”) and other interbank offered rates to alternative reference rates. Entities that make this optional expedient election would not have to remeasure the contracts at the modification date or reassess the accounting treatment if certain criteria are met and would continue applying hedge accounting for relationships affected by reference rate reform. The new standard was effective for the Company upon issuance and elections can be made through December 31, 2022. The Company is currently evaluating its options with regards to existing contracts and hedging relationships and the impact of adopting this update on its consolidated results of operations and financial position. Recently Adopted Accounting Pronouncements In April 2020, a FASB staff question and answer document was issued which intended to reduce the challenges of evaluating the enforceable rights and obligations of leases for concessions granted to lessees in response to the COVID-19 pandemic. We elected not to evaluate whether qualifying concessions provided by the Company in response to the COVID-19 pandemic are a lease modification, subject to the criteria that the total payments under the amended lease cannot result in a substantial increase in the rights of the lessor or obligations of the lessee. We also elected to treat the concessions as though they were contemplated as part of the existing contracts and therefore will not apply lease modification rules to the qualifying lease concession amendments. As such, deferrals deemed collectible are recorded as rental receivables with no change to timing of rental revenues and deferrals deemed non-collectible and abatements reduce rental revenues in the deferral/abatement period and cause rental revenues to effectively follow a cash basis related to the changes. The accounting elections provided by the FASB mainly apply to the Company’s non-residential leases and the majority of the amendments will not require a straight-line adjustment. See Note 8 for additional discussion. In February 2016, the FASB issued a lease 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 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. 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 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 lease 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 lease 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 lease 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 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 and financial position. In June 2016, the FASB issued a standard which requires companies to adopt a new approach for estimating credit losses on certain types of financial instruments, such as trade and other receivables and loans. The standard requires entities to estimate a lifetime expected credit loss for most financial instruments, including trade receivables. In November 2018, the FASB issued an amendment excluding operating lease receivables accounted for under the lease standard from the scope of the credit losses standard. The Company adopted th

Equity, Capital and Other Inter

Equity, Capital and Other Interests	12 Months Ended
	Dec. 31, 2020
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, 2020, 2019 and 2018: 2020 2019 2018 Common Shares Common Shares outstanding at January 1, 371,670,884 369,405,161 368,018,082 Common Shares Issued: Conversion of OP Units 122,505 313,940 131,477 Exercise of share options 239,695 1,745,050 1,056,388 Employee Share Purchase Plan (ESPP) 90,196 48,131 75,414 Restricted share grants, net 178,720 158,602 123,800 Common Shares outstanding at December 31, 372,302,000 371,670,884 369,405,161 Units Units outstanding at January 1, 13,731,315 13,904,035 13,768,438 Restricted unit grants, net 249,263 141,220 267,074 Conversion of OP Units to Common Shares (122,505 ) (313,940 ) (131,477 ) Units outstanding at December 31, 13,858,073 13,731,315 13,904,035 Total Common Shares and Units outstanding at December 31, 386,160,073 385,402,199 383,309,196 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, 2020, 2019 and 2018: 2020 2019 2018 General and Limited Partner Units General and Limited Partner Units outstanding at January 1, 385,402,199 383,309,196 381,786,520 Issued to General Partner: Exercise of EQR share options 239,695 1,745,050 1,056,388 EQR’s Employee Share Purchase Plan (ESPP) 90,196 48,131 75,414 EQR’s restricted share grants, net 178,720 158,602 123,800 Issued to Limited Partners: Restricted unit grants, net 249,263 141,220 267,074 General and Limited Partner Units outstanding at December 31, 386,160,073 385,402,199 383,309,196 Limited Partner Units Limited Partner Units outstanding at January 1, 13,731,315 13,904,035 13,768,438 Limited Partner restricted unit grants, net 249,263 141,220 267,074 Conversion of Limited Partner OP Units to EQR Common Shares (122,505 ) (313,940 ) (131,477 ) Limited Partner Units outstanding at December 31, 13,858,073 13,731,315 13,904,035 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 In terests – 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 Inter ests – 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 Interes ts – Operating Partnership/Limited Partners Capital in total in proportion to the number of Noncontrolling Interes ts – 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 P artnership/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 Interests – Operating Partnership/Limited Partners Capital requesting an exchange of their Noncontrolling Interests – Operating Partnership/Limited Partners Capital with EQR. Once the Operating Partnership elects not to redeem the Noncontrolling Interests – Operating Partnership/Limited Partners Capital for cash, EQR is obligated to deliver Common Shares to the exchanging holder of the Noncontrolling Interests – Operating Partnership/Limited Partners 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, 2020 and 2019. 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, 2020 and 2019, the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners have a redemption value of approximately $339.0 million and $463.4 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, 2020, 2019 and 2018, respectively (amounts in thousands): 2020 2019 2018 Balance at January 1, $ 463,400 $ 379,106 $ 366,955 Change in market value (125,224 ) 82,283 13,922 Change in carrying value 775 2,011 (1,771 ) Balance at December 31, $ 338,951 $ 463,400 $ 379,106 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, 2020 and 2019: Amounts in thousands Annual Call Dividend Per December 31, December 31, Date (1) Share/Unit (2) 2020 2019 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, 2020 and 2019 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, 2020, EQR has remaining authorization to repurchase up to 13.0 million of its shares.

Real Estate

Real Estate	12 Months Ended
	Dec. 31, 2020
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, 2020 and 2019 (amounts in thousands): 2020 2019 Land $ 5,785,367 $ 5,936,188 Depreciable property: Buildings and improvements 18,464,484 18,904,686 Furniture, fixtures and equipment 1,970,033 1,916,458 In-Place lease intangibles 486,137 497,957 Projects under development: Land 23,531 23,531 Construction-in-progress 387,603 158,099 Land held for development: Land 46,160 64,460 Construction-in-progress 40,010 32,228 Investment in real estate 27,203,325 27,533,607 Accumulated depreciation (7,859,657 ) (7,276,786 ) Investment in real estate, net $ 19,343,668 $ 20,256,821 Acquisitions and Dispositions During the year ended December 31, 2020, the Company acquired the following from unaffiliated parties (purchase price in thousands): Properties Apartment Units Purchase Price Rental Properties – Consolidated (1) 1 158 $ 48,860 Total 1 158 $ 48,860 (1) Purchase price includes an allocation of approximately $5.5 million to land and $43.4 million to depreciable property (inclusive of capitalized closing costs). 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, 2020, the Company disposed of the following to unaffiliated parties (sales price in thousands): Properties Apartment Units Sales Price Rental Properties – Consolidated 6 2,231 $ 1,066,861 Land Parcels (two) — — 55,510 Total 6 2,231 $ 1,122,371 The Company recognized a net gain on sales of real estate properties of approximately $531.8 million and a net gain on sales of land parcels of approximately $34.2 million on the above sales. 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 sale of land parcels of approximately $2.0 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.

Commitments to Acquire_Dispose

Commitments to Acquire/Dispose of Real Estate	12 Months Ended
	Dec. 31, 2020
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 an agreement to dispose the following (sales price and net book value in thousands): Properties Apartment Units Sales Price Net Book Value at December 31, 2020 Rental Properties – Consolidated 1 263 $ 84,250 $ 17,748 Total 1 263 $ 84,250 $ 17,748 The closing of this pending transaction is subject to certain conditions and restrictions; therefore, there can be no assurance that this transaction 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, 2020.

Investments in Partially Owned

Investments in Partially Owned Entities	12 Months Ended
	Dec. 31, 2020
Investments In Partially Owned Entities [Abstract]
Investments in Partially Owned Entities	6. Investments in Partially Owned Entities The Company has 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 16 properties containing 3,399 apartment units. The Company is the general partner or managing member of these joint ventures and is responsible for managing the operations and affairs of the joint ventures as well as making all decisions regarding the businesses of the joint ventures. The limited partners or non-managing members are not able to exercise substantive kick-out or participating rights. As a result, the joint ventures qualify as VIEs. The Company has a controlling financial interest in the VIEs and, thus, is the VIEs’ primary beneficiary. The Company has both the power to direct the activities of the VIEs that most significantly impact the VIEs’ economic performance as well as the obligation to absorb losses or the right to receive benefits from the VIEs that could potentially be significant to the VIEs. As a result, the joint ventures are required to be consolidated on the Company’s financial statements. The Company also has two separate consolidated joint ventures which each own land parcels that are being/will be developed into multifamily rental properties. These joint ventures have been deemed to be VIEs and are consolidated due to the Company being the primary beneficiary. The consolidated assets and liabilities related to the VIEs discussed above were approximately $784.1 million and $224.0 million, respectively, at December 31, 2020 and approximately $754.7 million and $323.1 million, respectively, at December 31, 2019. 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, 2020 December 31, 2020 December 31, 2019 Ownership Percentage Investments in Unconsolidated Entities: Operating Property (VIE) (1) $ 38,288 $ 40,361 33.3% Real Estate Technology (2) 14,866 12,318 Varies Other (372 ) (441 ) Varies Investments in Unconsolidated Entities $ 52,782 $ 52,238 (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) Represents unconsolidated investments in five separate real estate technology funds/companies.

Restricted Deposits

Restricted Deposits	12 Months Ended
	Dec. 31, 2020
Deposits Restricted [Abstract]
Restricted Deposits	7. Restricted Deposits The following table presents the Company’s restricted deposits as of December 31, 2020 and 2019 (amounts in thousands): December 31, 2020 December 31, 2019 Mortgage escrow deposits: Replacement reserves $ 9,877 $ 8,543 Mortgage principal reserves/sinking funds 14,168 9,689 Mortgage escrow deposits 24,045 18,232 Restricted cash: Tax-deferred (1031) exchange proceeds — 14,232 Restricted deposits on real estate investments 307 658 Resident security and utility deposits 31,412 37,140 Other 1,373 984 Restricted cash 33,092 53,014 Restricted deposits $ 57,137 $ 71,246

Leases

Leases	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Leases	8 . Leases Lessor Accounting The Company is the lessor for its residential and non-residential leases and these leases will continue to be accounted for as operating leases under the lease standard as described in Note 2. For the years ended December 31, 2020 and 2019, approximately 98% and 97%, respectively, 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 utility recoveries, 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 years ended December 31, 2020 and 2019, approximately 2% and 3%, respectively, of the Company’s total lease revenue is generated by non-residential leases that are generally for terms ranging between five to ten years. The non-residential leases generally consist of ground floor retail spaces and master-leased parking garages that serve as additional amenities for our residents. The non-residential leases may include lease income related to such items as utility recoveries, 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. Non-residential 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 lease standard. The following table presents the lease income types relating to lease payments for residential and non-residential leases along with the total other rental income for the years ended December 31, 2020 and 2019 (amounts in thousands): Year Ended December 31, 2020 Year Ended December 31, 2019 Income Type Residential Leases Non-Residential Leases Total Residential Leases Non-Residential Leases Total Residential and non-residential rent $ 2,336,778 $ 51,663 $ 2,388,441 $ 2,414,201 $ 71,988 $ 2,486,189 Utility recoveries (RUBS income) (1) 70,699 677 71,376 67,659 917 68,576 Parking rent 38,743 412 39,155 37,557 348 37,905 Storage rent 3,674 84 3,758 3,745 71 3,816 Pet rent 11,457 — 11,457 11,617 — 11,617 Total lease revenue $ 2,461,351 $ 52,836 2,514,187 $ 2,534,779 $ 73,324 2,608,103 Parking revenue 22,210 28,272 Other revenue 35,308 64,316 Total other rental income (2) 57,518 92,588 Rental income $ 2,571,705 $ 2,700,691 (1) RUBS income primarily consists of variable payments representing the recovery of utility costs from residents. (2 ) Other rental income is accounted for under the revenue recognition standard. The economic impact of the pandemic on a subset of our residents and tenants has led to elevated levels of bad debt. We continue to work with our residents and tenants on payment plans and collections and our bad debt allowance policies remain consistent. The following table presents residential and non-residential accounts receivable and straight-line receivable balances for the Company’s properties as of December 31, 2020 and 2019 (amounts in thousands): Residential Non-Residential Balance Sheet (Other assets): December 31, 2020 December 31, 2019 December 31, 2020 December 31, 2019 Resident/tenant accounts receivable balances $ 30,856 $ 4,040 $ 7,598 $ 1,766 Allowance for doubtful accounts (24,021 ) (1,190 ) (6,527 ) (1,412 ) Net receivable balances $ 6,835 (1) $ 2,850 $ 1,071 $ 354 Straight-line receivable balances $ 19,992 $ 1,841 $ 13,413 $ 26,450 (1) The Company held residential security deposits approximating 31.6% of the net receivable balance at December 31, 2020. The following table presents residential bad debt for the Company’s properties for the years ended December 31, 2020 and 2019 (amounts in thousands): Year Ended December 31, Income Statement (Rental income): 2020 2019 Bad debt, net $ 42,505 $ 12,067 % of rental income 1.7 % 0.5 % Due to the impact of COVID-19 and the resulting economic impact on our non-residential tenants, rental revenues declined as a result of a non-cash write-off of non-residential straight-line lease receivables of $13.2 million during the year ended December 31, 2020. 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, 2020 and 2019 (amounts in thousands): 2020 2019 Right-of-use assets: Corporate office leases (operating) $ 39,203 $ 41,596 Ground leases (finance) 57,584 57,982 Ground leases (operating) 402,500 413,196 Right-of-use assets $ 499,287 $ 512,774 Lease liabilities: Corporate office leases (operating) $ 40,470 $ 43,105 Ground leases (finance) 23,350 23,239 Ground leases (operating) 265,310 264,990 Lease liabilities $ 329,130 $ 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). 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. Additional disclosures The following tables illustrate the quantitative disclosures for lessees as of and for the years ended December 31, 2020 and 2019 (amounts in thousands): Year Ended December 31, 2020 Year Ended December 31, 2019 Lease cost: Finance lease cost: Amortization of right-of-use assets $ — $ — Interest on lease liabilities (capitalized) 1,029 225 Operating lease cost: Corporate office leases 3,747 3,937 Ground leases 22,102 22,198 Variable lease cost: Corporate office leases 1,307 1,489 Ground leases 3,304 3,700 Total lease cost $ 31,489 $ 31,549 December 31, 2020 December 31, 2019 Other information: Cash paid for amounts included in the measurement of lease liabilities: Investing cash flows from finance leases (capitalized) $ 567 $ 34,922 Operating cash flows from operating leases: Corporate office leases $ 5,296 $ 5,494 Ground leases $ 16,552 $ 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) 18.7 years 19.7 years Weighted-average remaining lease term – operating leases: Corporate office leases 17.4 years 18.1 years Ground leases 55.3 years 56.2 years Weighted-average discount rate – finance leases 3.0 % 3.0 % Weighted-average discount rate – operating leases: Corporate office leases 3.2 % 3.2 % Ground leases 5.0 % 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, 2020: (Payments)/Receipts Due by Year (in thousands) 2021 2022 2023 2024 2025 Thereafter Total Finance Leases: Minimum Rent Payments (a) $ (578 ) $ (590 ) $ (601 ) $ (614 ) $ (626 ) $ (33,224 ) $ (36,233 ) Operating Leases: Minimum Rent Payments (a) $ (17,160 ) $ (16,906 ) $ (16,997 ) $ (17,329 ) $ (17,375 ) $ (954,108 ) $ (1,039,875 ) Minimum Rent Receipts (b) $ 59,430 $ 54,656 $ 51,091 $ 45,166 $ 38,847 $ 126,732 $ 375,922 (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 non-residential 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, 2020 (amounts in thousands): 2020 Total minimum rent payments $ 1,076,108 Less: Lease discount 746,978 Lease liabilities $ 329,130

Debt

Debt	12 Months Ended
	Dec. 31, 2020
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, 2020 and 2019 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, 2020 and 2019, respectively (amounts in thousands): Mortgage notes payable, net as of December 31, 2019 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, 2020 Fixed Rate Debt: Secured – Conventional $ 1,574,699 $ 495,000 (2) $ (160,522 ) $ (7,759 ) $ 988 $ (1,315 ) $ 1,901,091 Floating Rate Debt: Secured – Conventional 7,050 24,204 — — — 240 31,494 Secured – Tax Exempt 359,861 — — — 1,246 198 361,305 Floating Rate Debt 366,911 24,204 — — 1,246 438 392,799 Total $ 1,941,610 $ 519,204 $ (160,522 ) $ (7,759 ) $ 2,234 $ (877 ) $ 2,293,890 (1 ) Represents amortization of deferred financing costs, net of debt financing costs. (2 ) Obtained a 2.60% fixed rate mortgage loan pool maturing on May 1, 2030. 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). The following table summarizes the Company’s debt extinguishment costs on mortgages recorded as additional interest expense during the years ended December 31, 2020 and 2019, respectively (amounts in thousands): Description 2020 2019 Prepayment premiums/penalties $ 327 $ 3,381 Write-offs of unamortized deferred financing costs 63 2,273 Write-offs of unamortized (premiums)/discounts/OCI (190 ) 6,153 Total $ 200 $ 11,807 The following table summarizes certain interest rate and maturity date information as of and for the years ended December 31, 2020 and 2019, respectively: December 31, 2020 December 31, 2019 Interest Rate Ranges 0.06% - 4.71% 0.10% - 5.29% Weighted Average Interest Rate 3.33% 3.84% Maturity Date Ranges 2021-2061 2020-2061 As of both December 31, 2020 and 2019, the Company had $281.7 million of secured debt (primarily tax-exempt bonds) subject to third-party credit enhancement. The historical cost, net of accumulated depreciation, of encumbered properties was $2.9 billion and $2.7 billion at December 31, 2020 and 2019, respectively. Notes The following tables summarize the Company’s notes activity for the years ended December 31, 2020 and 2019, respectively (amounts in thousands): Notes, net as of December 31, 2019 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, 2020 Fixed Rate Debt: Unsecured – Public $ 6,077,513 $ — $ (750,000 ) $ — $ 2,997 $ 5,026 $ 5,335,536 (1) Represents amortization of deferred financing costs, net of debt financing costs. 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. The following table summarizes the Company’s debt extinguishment costs on notes recorded as additional interest expense during the years ended December 31, 2020 and 2019, respectively (amounts in thousands): Description 2020 2019 Prepayment premiums/penalties $ 25,823 $ 10,266 Write-offs of unamortized deferred financing costs 571 287 Write-offs of unamortized (premiums)/discounts/OCI 12,698 1,043 Total $ 39,092 $ 11,596 The following table summarizes certain interest rate and maturity date information as of and for the years ended December 31, 2020 and 2019, respectively: December 31, 2020 December 31, 2019 Interest Rate Ranges 2.50% - 7.57% 2.50% - 7.57% Weighted Average Interest Rate 4.03% 4.21% Maturity Date Ranges 2023-2047 2021-2047 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, 2020 and 2019. 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 an annual facility fee (currently ). Both the spread and the facility fee are dependent on the Company’s senior unsecured credit rating. On November 4, 2019, the Company increased the maximum aggregate amount outstanding for its commercial paper program from $500.0 million to $1.0 billion. The notes will be sold 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 along with certain other obligations. The following table presents the availability on the Company’s unsecured revolving credit facility as of December 31, 2020 and 2019 (amounts in thousands): December 31, 2020 December 31, 2019 Unsecured revolving credit facility commitment $ 2,500,000 $ 2,500,000 Commercial paper balance outstanding (415,000 ) (1,000,000 ) Unsecured revolving credit facility balance outstanding — (20,000 ) Other restricted amounts (100,949 ) (100,929 ) Unsecured revolving credit facility availability $ 1,984,051 $ 1,379,071 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, 2020 and 2019, respectively (amounts in thousands): Description 2020 2019 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, 2020 (amounts in thousands): Year Total 2021 (1) $ 450,665 2022 296,040 2023 1,329,088 2024 6,100 2025 458,200 Thereafter 5,586,810 Subtotal 8,126,903 Deferred Financing Costs and Unamortized (Discount) (82,647 ) Total $ 8,044,256 (1) Includes $415.0 million 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, 2020
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). The following table summarizes the inputs to the valuations for each type of fair value measurement: Fair Value Measurement Type Valuation Inputs Employee holdings (other than Common Shares) within the supplemental executive retirement plan (the “SERP”) Quoted market prices for identical assets. These holdings are included in other assets and other liabilities on the consolidated balance sheets. Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Quoted market price of Common Shares. Mortgage notes payable and private unsecured debt (including its commercial paper and line of credit, if applicable) Indicative rates provided by lenders of similar loans. Public unsecured notes Quoted market prices for each underlying issuance. 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, 2020 and 2019, respectively (amounts in thousands): December 31, 2020 December 31, 2019 Carrying Value Estimated Fair Value (Level 2) Carrying Value Estimated Fair Value (Level 2) Mortgage notes payable, net $ 2,293,890 $ 2,313,263 $ 1,941,610 $ 1,930,710 Unsecured debt, net 5,750,366 6,686,612 7,095,346 7,677,289 Total debt, net $ 8,044,256 $ 8,999,875 $ 9,036,956 $ 9,607,999 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, 2020 and 2019, respectively (amounts in thousands): Fair Value Measurements at Reporting Date Using Description Balance Sheet Location 12/31/2020 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 $ 160,293 $ 160,293 $ — $ — Liabilities Supplemental Executive Retirement Plan Other Liabilities $ 160,293 $ 160,293 $ — $ — Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Mezzanine $ 338,951 $ — $ 338,951 $ — 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 $ — 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, 2020, 2019 and 2018, respectively (amounts in thousands): December 31, 2020 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 N/A $ — N/A N/A $ — Total $ — $ — 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 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, 2020, 2019 and 2018, respectively (amounts in thousands): Effective Portion December 31, 2020 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 $ (1,190 ) Interest expense $ (35,087 ) Total $ (1,190 ) $ (35,087 ) 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 ) $ — As of December 31, 2020 and 2019, there were approximately $43.7 million and $77.6 million in deferred losses, net, included in accumulated other comprehensive income (loss), respectively, related to derivative instruments, of which an estimated $10.2 million may be recognized as additional interest expense during the twelve months ending December 31, 2021. In April 2020, the Company paid approximately $1.2 million to settle two forward starting swaps in conjunction with the issuance of $495.0 million of ten-year 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 increase to interest expense. The remaining $ 41.6 million will be deferred as a component of accumulated other comprehensive income (loss) and will be recognized as an increase to interest expense over the first nine years and eleven months of the notes. 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

Earnings Per Share and Earnings

Earnings Per Share and Earnings Per Unit	12 Months Ended
	Dec. 31, 2020
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, 2020 2019 2018 Numerator for net income per share – basic: Net income $ 962,501 $ 1,009,708 $ 685,192 Allocation to Noncontrolling Interests – Operating Partnership (34,010 ) (36,034 ) (24,939 ) Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (14,855 ) (3,297 ) (2,718 ) Preferred distributions (3,090 ) (3,090 ) (3,090 ) Numerator for net income per share – basic $ 910,546 $ 967,287 $ 654,445 Numerator for net income per share – diluted: Net income $ 962,501 $ 1,009,708 $ 685,192 Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (14,855 ) (3,297 ) (2,718 ) Preferred distributions (3,090 ) (3,090 ) (3,090 ) Numerator for net income per share – diluted $ 944,556 $ 1,003,321 $ 679,384 Denominator for net income per share – basic and diluted: Denominator for net income per share – basic 371,791 370,461 368,052 Effect of dilutive securities: OP Units 13,003 12,907 12,869 Long-term compensation shares/units 1,080 2,965 2,774 Denominator for net income per share – diluted 385,874 386,333 383,695 Net income per share – basic $ 2.45 $ 2.61 $ 1.78 Net income per share – diluted $ 2.45 $ 2.60 $ 1.77 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, 2020 2019 2018 Numerator for net income per Unit – basic and diluted: Net income $ 962,501 $ 1,009,708 $ 685,192 Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (14,855 ) (3,297 ) (2,718 ) Allocation to Preference Units (3,090 ) (3,090 ) (3,090 ) Numerator for net income per Unit – basic and diluted $ 944,556 $ 1,003,321 $ 679,384 Denominator for net income per Unit – basic and diluted: Denominator for net income per Unit – basic 384,794 383,368 380,921 Effect of dilutive securities: Dilution for Units issuable upon assumed exercise/vesting of the Company’s long-term compensation shares/units 1,080 2,965 2,774 Denominator for net income per Unit – diluted 385,874 386,333 383,695 Net income per Unit – basic $ 2.45 $ 2.61 $ 1.78 Net income per Unit – diluted $ 2.45 $ 2.60 $ 1.77

Share Incentive Plans

Share Incentive Plans	12 Months Ended
	Dec. 31, 2020
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. 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, 2020, 10,512,390 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 Award s 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. Valuation Method of Share Options 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 Options was estimated at the time the Options were granted using the Black-Scholes option pricing model with the primary grant in each year having the following weighted average assumptions: 2020 2019 2018 Expected volatility (1) 15.2 % 16.3 % 14.8 % Expected life (2) 5 years 5 years 5 years Expected dividend yield (3) 3.04 % 3.10 % 3.09 % Risk-free interest rate (4) 1.32 % 2.43 % 2.52 % Option valuation per share $ 7.23 $ 8.06 $ 6.15 (1) Expected volatility – Estimated based on the historical five-year (2) Expected life – Approximates the actual weighted average life of all 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 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. 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. No payout would be made for any return below 50% of the target performance metric. 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 while 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. If employment is terminated prior to vesting, the restricted shares and restricted units are generally canceled. 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. The grant date fair value of the TSR portion of the LTI awards is estimated using a multifactor Monte Carlo model to determine share prices for an absolute award for which the payout of the award only depends on EQR’s TSR and a set of relative awards for which the payout of the award depends on the spread of EQR’s TSR to the TSR of two indices: (a) the FTSE Nareit Apartment Index; and (b) the FTSE Nareit Equity Index. The grant date fair value of the Normalized FFO portion of the LTI awards is estimated using the closing price of EQR Common Shares on the grant date for the restricted shares and a discounted closing price of EQR Common Shares on the grant date for the restricted units to reflect the “book-up” and liquidity risk inherent in the units. The individual prices determined above are then weighted to arrive at the final values for each restricted share/unit as follows: 2020 2019 2018 Weighted average fair value per restricted share $ 75.89 $ 65.36 $ 63.86 Weighted average fair value per restricted unit $ 72.69 $ 63.12 $ 62.20 The valuation method and assumptions are the same as those the Company used in accounting for restricted share/unit expense in its consolidated financial statements. The Monte Carlo valuation model is only one method of valuing awards. Because the Company’s restricted shares/units have characteristics significantly different from those of traded shares/units, and because changes in the subjective input assumptions can materially affect the fair value estimate, the actual value of the restricted shares/units to the recipient may be significantly different. 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 years ended December 31, 2020, 2019 and 2018. Year Ended December 31, 2020 Compensation Expense Compensation Capitalized Restricted Units/Options In-Lieu of Bonus (1) Compensation Equity Dividends Incurred Restricted shares (2) $ 10,053 $ 1,172 $ — $ 11,225 $ 1,172 Restricted units (2) 10,103 80 1,743 11,926 1,855 Options 2,156 193 — 2,349 — ESPP discount 862 82 — 944 — Total $ 23,174 $ 1,527 $ 1,743 $ 26,444 $ 3,027 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 (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 percenta ge 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, 2020 is $10.5 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 1.27 years. The table below summarizes the Award activity of the Share Incentive Plans for the three years ended December 31, 2020, 2019 and 2018 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, 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 Awards granted (1) (5) 317,731 $ 76.26 179,911 $ 77.44 249,263 $ 72.00 Awards exercised/vested (2) (3) (4) (239,695 ) $ 50.31 (131,792 ) $ 66.32 (227,747 ) $ 68.47 Awards forfeited (1,344 ) $ 72.69 (1,191 ) $ 73.45 — $ — Awards expired (1,484 ) $ 47.18 — $ — — $ — Balance at December 31, 2020 5,642,752 $ 56.91 353,634 $ 71.81 879,800 $ 66.78 (1) The weighted average grant date fair value for Options granted during the years ended December 31, 2020, 2019 and 2018 was $6.74 per share, $8.05 per share and $6.17 per share, respectively. (2) The aggregate intrinsic value of Options exercised during the years ended December 31, 2020, 2019 and 2018 was $7.6 million, $58.1 million and $42.9 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, 2020, 2019 and 2018 was $10.6 million, $11.1 million and $11.5 million, respectively. (4) The fair value of restricted units vested during the years ended December 31, 2020, 2019 and 2018 was $18.7 million, $29.1 million and $1.8 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, 2020 (aggregate intrinsic value is in thousands): Options Weighted Average Remaining Contractual Life in Years Weighted Average Exercise Price Aggregate Intrinsic Value (1) Options Outstanding 5,642,752 4.64 $ 56.91 $ 26,881 Options Exercisable 4,985,668 4.16 $ 55.12 $ 26,804 Vested and expected to vest 648,552 8.32 $ 70.40 $ 77 (1) The aggregate intrinsic values were calculated as the excess, if any, between the Company’s closing share price of $ 59.28 per share on December 31, 2020 and the strike price of the underlying awards. As of December 31, 2019 and 2018, 4,750,481 Options (with a weighted average exercise price of $54.13) and 5,328,020 Options (with a weighted average exercise price of $49.57) were exercisable, respectively.

Employee Plans

Employee Plans	12 Months Ended
	Dec. 31, 2020
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 2,624,136 Common Shares remained available for purchase at December 31, 2020. 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, 2020 2019 2018 Shares issued 90,196 48,131 75,414 Issuance price ranges $46.23 – $63.84 $59.56 – $72.91 $47.80 – $57.09 Issuance proceeds $4,508 $3,116 $3,879 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 $5.2 million, $5.0 million and $4.9 million for the years ended December 31, 2020, 2019 and 2018, 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, 2020
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 4,650,334 Common Shares available for issuance under the 2014 DRIP at December 31, 2020. 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, 2020
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, 2020, 2019 and 2018 were approximately $2.1 million, $2.6 million and $2.5 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, 2020
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 laws, including, but not limited to, rent regulations and 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, whether related to COVID-19 or otherwise, 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, 2020, 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 $191.7 million (inclusive of applicable construction mortgage and joint venture partner obligations) and estimated completion dates ranging through September 30, 2021. The Company completed and stabilized two projects during the year ended December 31, 2020. As of December 31, 2020, the Company has two joint venture agreements with third-party partners for the consolidated development of multifamily rental properties, one of which is currently under construction as noted above. The development commitment to fund the project under construction is included in the development funding totals above for the one joint venture project where construction has started. 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, 2020, 2019 and 2018, the Company recognized compensation expense of $0.5 million, $0.4 million and $0.3 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, 2020: (Payments)/Receipts Due by Year (in thousands) 2021 2022 2023 2024 2025 Thereafter Total Other Long-Term Liabilities: Deferred Compensation (1) $ (769 ) $ (1,130 ) $ (1,005 ) $ (723 ) $ (723 ) $ (3,976 ) $ (8,326 ) (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, 2020
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. While the Company does maintain a non-residential presence, it accounts for approximately 2.7% of total revenues and is designed as an amenity for our residential residents. The chief operating decision maker evaluates the performance of each property on a consolidated residential and non-residential basis. The Company’s geographic consolidated same store operating segments represent its reportable segments. The Company’s 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, 2020, 2019 and 2018, 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, 2020, 2019 and 2018, respectively (amounts in thousands): Year Ended December 31, 2020 2019 2018 Rental income $ 2,571,705 $ 2,700,691 $ 2,577,681 Property and maintenance expense (440,998 ) (446,845 ) (429,335 ) Real estate taxes and insurance expense (381,562 ) (366,139 ) (357,814 ) Total operating expenses (822,560 ) (812,984 ) (787,149 ) Net operating income $ 1,749,145 $ 1,887,707 $ 1,790,532 The following tables present NOI for each segment from our rental real estate for the years ended December 31, 2020, 2019 and 2018, respectively, as well as total assets and capital expenditures at December 31, 2020 and 2019, respectively (amounts in thousands): Year Ended December 31, 2020 Year Ended December 31, 2019 Year Ended December 31, 2018 Rental Income Operating Expenses NOI Rental Income Operating Expenses NOI Rental Income Operating Expenses NOI Same store (1) Los Angeles $ 468,450 $ 145,342 $ 323,108 $ 485,084 $ 144,314 $ 340,770 $ 451,592 $ 129,455 $ 322,137 Orange County 105,236 24,545 80,691 105,087 24,359 80,728 101,198 24,468 76,730 San Diego 74,737 18,176 56,561 73,698 17,889 55,809 91,971 24,024 67,947 Subtotal - Southern California 648,423 188,063 460,360 663,869 186,562 477,307 644,761 177,947 466,814 San Francisco 451,724 119,183 332,541 473,102 115,702 357,400 463,492 112,331 351,161 Washington D.C. 389,533 120,533 269,000 394,171 119,419 274,752 403,761 123,345 280,416 New York 426,016 198,228 227,788 464,270 191,514 272,756 444,112 178,055 266,057 Seattle 245,559 71,003 174,556 252,311 68,717 183,594 200,222 55,871 144,351 Boston 240,158 71,611 168,547 253,297 70,875 182,422 218,778 60,409 158,369 Other Markets 17,605 4,858 12,747 18,215 4,713 13,502 1,940 658 1,282 Total same store 2,419,018 773,479 1,645,539 2,519,235 757,502 1,761,733 2,377,066 708,616 1,668,450 Non-same store/other (2) (3) Non-same store 116,103 35,952 80,151 58,751 17,702 41,049 103,688 36,874 66,814 Other (3) 36,584 13,129 23,455 122,705 37,780 84,925 96,927 41,659 55,268 Total non-same store/other 152,687 49,081 103,606 181,456 55,482 125,974 200,615 78,533 122,082 Totals $ 2,571,705 $ 822,560 $ 1,749,145 $ 2,700,691 $ 812,984 $ 1,887,707 $ 2,577,681 $ 787,149 $ 1,790,532 (1) For the years ended December 31, 2020 and 2019, same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2019, less properties subsequently sold, which represented 73,585 apartment units. For the year ended December 31, 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. (2) For the years ended December 31, 2020 and 2019, non-same store primarily includes properties acquired after January 1, 2019, plus any properties in lease-up and not stabilized as of January 1, 2019. For the year ended December 31, 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. (3) Other includes development, other corporate operations and operations prior to disposition for properties sold. Year Ended December 31, 2020 Year Ended December 31, 2019 Total Assets Capital Expenditures Total Assets Capital Expenditures Same store (1) Los Angeles $ 3,007,621 $ 22,817 $ 3,110,659 $ 32,611 Orange County 389,007 7,260 404,545 9,276 San Diego 242,429 3,430 252,051 3,947 Subtotal - Southern California 3,639,057 33,507 3,767,255 45,834 San Francisco 3,233,901 18,983 3,345,882 25,925 Washington D.C. 3,066,702 23,626 3,174,721 22,409 New York 3,950,286 25,609 4,004,078 26,976 Seattle 1,802,952 11,372 1,871,232 22,023 Boston 1,758,665 18,367 1,822,373 27,267 Denver 247,133 817 255,974 701 Total same store 17,698,696 132,281 18,241,515 171,135 Non-same store/other (2) (3) Non-same store 1,664,892 2,627 1,681,367 1,864 Other (3) 923,303 1,071 1,249,887 5,424 Total non-same store/other 2,588,195 3,698 2,931,254 7,288 Totals $ 20,286,891 $ 135,979 $ 21,172,769 $ 178,423 (1) Same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2019, less properties subsequently sold, which represented 73,585 apartment units. (2) Non-same store primarily includes properties acquired after January 1, 2019, plus any properties in lease-up and not stabilized as of January 1, 2019. (3) Other includes development, other corporate operations and capital expenditures for properties sold.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	1 8 . Subsequent Events There have been no material subsequent events occurring since December 31, 2020.

Schedule III - Real Estate and

Schedule III - Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2020
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, 2020 Properties Apartment Units Investment in Real Estate, Gross Accumulated Depreciation Investment in Real Estate, Net Encumbrances (1) Wholly Owned Unencumbered 246 64,363 $ 22,528,561,227 $ (6,521,859,521 ) $ 16,006,701,706 $ — Wholly Owned Encumbered 42 10,127 3,704,582,050 (1,032,587,859 ) 2,671,994,191 2,088,144,904 Wholly Owned Properties 288 74,490 26,233,143,277 (7,554,447,380 ) 18,678,695,897 2,088,144,904 Partially Owned Unencumbered 14 2,699 672,990,027 (231,543,640 ) 441,446,387 — Partially Owned Encumbered 2 700 297,191,796 (73,666,183 ) 223,525,613 205,744,819 Partially Owned Properties 16 3,399 970,181,823 (305,209,823 ) 664,972,000 205,744,819 Total Unencumbered Properties 260 67,062 23,201,551,254 (6,753,403,161 ) 16,448,148,093 — Total Encumbered Properties 44 10,827 4,001,773,846 (1,106,254,042 ) 2,895,519,804 2,293,889,723 Total Consolidated Investment in Real Estate 304 77,889 $ 27,203,325,100 $ (7,859,657,203 ) $ 19,343,667,897 $ 2,293,889,723 (1) See attached Encumbrances Reconciliation. EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation Encumbrances Reconciliation December 31, 2020 Portfolio/Entity Encumbrances Number of Properties Encumbered by See Properties With Note: Amount Archstone Master Property Holdings LLC 13 H $ 798,691,865 Portfolio/Entity Encumbrances 13 798,691,865 Individual Property Encumbrances 1,495,197,858 Total Encumbrances per Financial Statements $ 2,293,889,723 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, 2020, 2019 and 2018 are as follows: 2020 2019 2018 Balance, beginning of year $ 27,533,607 $ 26,511,022 $ 26,026,896 Acquisitions and development 298,847 1,704,320 855,254 Improvements 154,433 180,944 192,661 Dispositions and other (783,562 ) (862,679 ) (563,789 ) Balance, end of year $ 27,203,325 $ 27,533,607 $ 26,511,022 The changes in accumulated depreciation for the years ended December 31, 2020, 2019 and 2018 are as follows: 2020 2019 2018 Balance, beginning of year $ 7,276,786 $ 6,696,281 $ 6,040,378 Depreciation 820,832 831,083 785,725 Dispositions and other (237,961 ) (250,578 ) (129,822 ) Balance, end of year $ 7,859,657 $ 7,276,786 $ 6,696,281 EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation December 31, 2020 Description Initial Cost to Company Cost Capitalized Subsequent to Acquisition (Improvements, net) (E) Gross Amount Carried at Close of Period 12/31/20 Apartment Name Location Non-Residential Components 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 12/31/20 Encumbrances Wholly Owned Unencumbered: 100 K Apartments (fka 100K Street) Washington, D.C. — 2018 222 $ 15,600,000 $ 70,296,069 $ 18,484 $ 15,600,000 $ 70,314,553 $ 85,914,553 $ (6,076,767 ) $ 79,837,786 $ — 140 Riverside Boulevard New York, NY G 2003 354 103,539,100 94,082,725 10,817,358 103,539,100 104,900,083 208,439,183 (56,324,733 ) 152,114,450 — 160 Riverside Boulevard New York, NY G 2001 455 139,933,500 190,964,745 18,135,193 139,933,500 209,099,938 349,033,438 (112,149,211 ) 236,884,227 — 170 Amsterdam New York, NY G 2015 236 — 112,096,955 734,040 — 112,830,995 112,830,995 (25,078,672 ) 87,752,323 — 175 Kent Brooklyn, NY G 2011 113 22,037,831 53,962,169 2,476,612 22,037,831 56,438,781 78,476,612 (20,147,633 ) 58,328,979 — 180 Montague (fka Brooklyn Heights) Brooklyn, NY G 2000 193 32,400,000 92,675,228 5,346,485 32,400,000 98,021,713 130,421,713 (30,697,551 ) 99,724,162 — 180 Riverside Boulevard New York, NY G 1998 516 144,968,250 138,346,681 16,593,445 144,968,250 154,940,126 299,908,376 (83,930,689 ) 215,977,687 — 1210 Mass Washington, D.C. G 2004 144 9,213,512 36,559,189 3,222,293 9,213,512 39,781,482 48,994,994 (21,574,097 ) 27,420,897 — 1401 Joyce on Pentagon Row Arlington, VA — 2004 326 9,780,000 89,668,165 5,636,363 9,780,000 95,304,528 105,084,528 (41,418,326 ) 63,666,202 — 1500 Mass Ave Washington, D.C. G 1951 556 54,638,298 40,361,702 16,685,633 54,638,298 57,047,335 111,685,633 (31,601,970 ) 80,083,663 — 1800 Oak (fka Rosslyn) Arlington, VA G 2003 314 31,400,000 109,005,734 8,912,514 31,400,000 117,918,248 149,318,248 (37,308,243 ) 112,010,005 — 2201 Pershing Drive Arlington, VA G 2012 188 11,321,198 49,674,175 2,798,189 11,321,198 52,472,364 63,793,562 (17,223,799 ) 46,569,763 — 2201 Wilson Arlington, VA G 2000 219 21,900,000 78,724,663 5,288,939 21,900,000 84,013,602 105,913,602 (26,463,239 ) 79,450,363 — 2400 M St Washington, D.C. G 2006 359 30,006,593 114,013,785 4,779,484 30,006,593 118,793,269 148,799,862 (61,688,804 ) 87,111,058 — 315 on A Boston, MA G 2013 202 14,450,070 115,824,930 1,442,998 14,450,070 117,267,928 131,717,998 (27,148,732 ) 104,569,266 — 340 Fremont (fka Rincon Hill) San Francisco, CA — 2016 348 42,000,000 248,608,702 366,576 42,000,000 248,975,278 290,975,278 (43,051,114 ) 247,924,164 — 341 Nevins Brooklyn, NY — (F) — 3,621,717 261,079 — 3,621,717 261,079 3,882,796 — 3,882,796 — 3003 Van Ness (fka Van Ness) Washington, D.C. — 1970 625 56,300,000 141,191,580 8,427,901 56,300,000 149,619,481 205,919,481 (49,200,506 ) 156,718,975 — 425 Mass Washington, D.C. G 2009 559 28,150,000 138,600,000 5,317,169 28,150,000 143,917,169 172,067,169 (58,212,092 ) 113,855,077 — 455 Eye Street Washington, D.C. G 2017 174 11,941,407 61,418,689 59,540 11,941,407 61,478,229 73,419,636 (8,480,027 ) 64,939,609 — 4th and Hill Los Angeles, CA — (F) — 13,131,456 18,548,300 — 13,131,456 18,548,300 31,679,756 — 31,679,756 — 55 West Fifth I & II (fka Townhouse Plaza and Gardens) San Mateo, CA — 1964/1972 241 21,041,710 71,931,323 14,359,593 21,041,710 86,290,916 107,332,626 (32,617,071 ) 74,715,555 — 600 Washington New York, NY G 2004 135 32,852,000 43,140,551 2,440,539 32,852,000 45,581,090 78,433,090 (23,873,446 ) 54,559,644 — 660 Washington (fka Boston Common) Boston, MA G 2006 420 106,100,000 166,311,679 7,631,972 106,100,000 173,943,651 280,043,651 (52,935,820 ) 227,107,831 — 70 Greene Jersey City, NJ G 2010 480 28,108,899 236,763,553 3,894,770 28,108,899 240,658,323 268,767,222 (90,074,628 ) 178,692,594 — 71 Broadway New York, NY G 1997 238 22,611,600 77,492,171 18,570,618 22,611,600 96,062,789 118,674,389 (55,283,708 ) 63,390,681 — 77 Bluxome San Francisco, CA — 2007 102 5,249,124 18,609,876 498,937 5,249,124 19,108,813 24,357,937 (7,020,181 ) 17,337,756 — 77 Park Avenue (fka Hoboken) Hoboken, NJ G 2000 301 27,900,000 168,992,440 8,837,952 27,900,000 177,830,392 205,730,392 (54,327,929 ) 151,402,463 — 777 Sixth New York, NY G 2002 294 65,352,706 65,747,294 5,748,406 65,352,706 71,495,700 136,848,406 (33,061,181 ) 103,787,225 — 88 Hillside Daly City, CA G 2011 95 7,786,800 31,587,325 3,442,015 7,786,800 35,029,340 42,816,140 (12,829,331 ) 29,986,809 — 855 Brannan San Francisco, CA G 2018 449 41,363,921 282,133,994 132,534 41,363,921 282,266,528 323,630,449 (34,706,782 ) 288,923,667 — 929 Mass (fka 929 House) Cambridge, MA G 1975 127 3,252,993 21,745,595 8,432,225 3,252,993 30,177,820 33,430,813 (21,091,399 ) 12,339,414 — Academy Village North Hollywood, CA — 1989 248 25,000,000 23,593,194 11,156,576 25,000,000 34,749,770 59,749,770 (21,580,086 ) 38,169,684 — Acappella Pasadena, CA — 2002 143 5,839,548 29,360,452 2,419,827 5,839,548 31,780,279 37,619,827 (13,423,512 ) 24,196,315 — Acton Courtyard Berkeley, CA G 2003 71 5,550,000 15,785,509 445,554 5,550,000 16,231,063 21,781,063 (8,147,133 ) 13,633,930 — Alban Towers Washington, D.C. — 1934 229 18,900,000 89,794,201 7,195,879 18,900,000 96,990,080 115,890,080 (29,449,847 ) 86,440,233 — Alborada Fremont, CA — 1999 442 24,310,000 59,214,129 9,737,294 24,310,000 68,951,423 93,261,423 (47,184,982 ) 46,076,441 — Alcott Apartments (fka West End Tower) Boston, MA G (F) — 10,424,000 257,358,529 — 10,424,000 257,358,529 267,782,529 — 267,782,529 — Altitude (fka Village at Howard Hughes, The (Lots 1 & 2)) Los Angeles, CA — 2016 545 43,783,485 150,235,105 612,403 43,783,485 150,847,508 194,630,993 (26,754,900 ) 167,876,093 — Alton, The (fka Millikan) Irvine, CA — 2017 344 11,049,027 96,524,128 243,844 11,049,027 96,767,972 107,816,999 (15,320,884 ) 92,496,115 — Arbor Terrace Sunnyvale, CA — 1979 175 9,057,300 18,483,642 11,966,964 9,057,300 30,450,606 39,507,906 (19,584,926 ) 19,922,980 — Arches, The Sunnyvale, CA — 1974 410 26,650,000 62,850,000 3,279,238 26,650,000 66,129,238 92,779,238 (27,016,180 ) 65,763,058 — EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation December 31, 2020 Description Initial Cost to Company Cost Capitalized Subsequent to Acquisition (Improvements, net) (E) Gross Amount Carried at Close of Period 12/31/20 Apartment Name Location Non-Residential Components 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 12/31/20 Encumbrances Artisan on Second Los Angeles, CA — 2008 118 8,000,400 36,074,600 1,298,143 8,000,400 37,372,743 45,373,143 (14,173,055 ) 31,200,088 — Artistry Emeryville (fka Emeryville) Emeryville, CA — 1994 267 12,300,000 61,466,267 7,368,364 12,300,000 68,834,631 81,134,631 (23,980,609 ) 57,154,022 — Atelier Brooklyn, NY G 2015 120 32,401,680 47,135,432 515,334 32,401,680 47,650,766 80,052,446 (10,219,483 ) 69,832,963 — Avenue Two Redwood City, CA — 1972 123 7,995,000 18,005,000 2,509,228 7,995,000 20,514,228 28,509,228 (8,409,710 ) 20,099,518 — Axis at Shady Grove Rockville, MD — 2016 366 14,745,774 90,503,831 240,588 14,745,774 90,744,419 105,490,193 (11,084,271 ) 94,405,922 — Azure (fka Mission Bay-Block 13) San Francisco, CA — 2015 273 32,855,115 153,567,641 479,066 32,855,115 154,046,707 186,901,822 (30,930,604 ) 155,971,218 — Bay Hill Long Beach, CA — 2002 160 7,600,000 27,437,239 4,043,249 7,600,000 31,480,488 39,080,488 (17,947,925 ) 21,132,563 — Beatrice, The New York, NY — 2010 302 114,351,405 165,648,595 2,437,470 114,351,405 168,086,065 282,437,470 (56,957,402 ) 225,480,068 — Bella Vista I, II, III Combined Woodland Hills, CA — 2003-2007 579 31,682,754 121,095,786 11,255,581 31,682,754 132,351,367 164,034,121 (68,433,638 ) 95,600,483 — Belle Arts Condominium Homes, LLC Bellevue, WA — 2000 1 63,158 236,157 2,098 63,158 238,255 301,413 (99,931 ) 201,482 — Belle Fontaine Marina Del Rey, CA — 2003 102 9,098,808 28,701,192 2,356,766 9,098,808 31,057,958 40,156,766 (11,041,933 ) 29,114,833 — Breakwater at Marina Del Rey Marina Del Rey, CA — 1964-1969 224 — 73,189,262 2,420,327 — 75,609,589 75,609,589 (25,201,234 ) 50,408,355 — Briarwood (CA) Sunnyvale, CA — 1985 192 9,991,500 22,247,278 4,418,254 9,991,500 26,665,532 36,657,032 (20,063,847 ) 16,593,185 — Brodie, The Westminster, CO — 2016 312 8,639,904 79,254,618 685,818 8,639,904 79,940,436 88,580,340 (8,800,355 ) 79,779,985 — Brooklyner, The (fka 111 Lawrence) Brooklyn, NY G 2010 490 40,099,922 221,438,631 5,139,174 40,099,922 226,577,805 266,677,727 (77,766,873 ) 188,910,854 — C on Pico Los Angeles, CA — 2014 94 17,125,766 28,074,234 607,130 17,125,766 28,681,364 45,807,130 (6,042,014 ) 39,765,116 — Carlyle Mill Alexandria, VA — 2002 317 10,000,000 51,367,913 9,482,880 10,000,000 60,850,793 70,850,793 (37,283,170 ) 33,567,623 — Carmel Terrace San Diego, CA — 1988-1989 384 2,288,300 20,596,281 12,821,204 2,288,300 33,417,485 35,705,785 (29,568,634 ) 6,137,151 — Cascade Seattle, WA G 2017 477 23,751,564 149,384,842 58,556 23,751,564 149,443,398 173,194,962 (20,377,508 ) 152,817,454 — Centennial (fka Centennial Court & Centennial Tower) Seattle, WA G 1991/2001 408 9,700,000 70,080,378 14,204,709 9,700,000 84,285,087 93,985,087 (47,446,620 ) 46,538,467 — Centre Club Combined Ontario, CA — 1994 & 2002 412 7,436,000 33,014,789 9,778,429 7,436,000 42,793,218 50,229,218 (28,483,810 ) 21,745,408 — Chelsea Square Redmond, WA — 1991 113 3,397,100 9,289,074 3,046,308 3,397,100 12,335,382 15,732,482 (9,272,305 ) 6,460,177 — Chloe on Madison (fka 1401 E. Madison) Seattle, WA G 2019 137 10,401,958 53,750,777 2,916 10,401,958 53,753,693 64,155,651 (2,655,541 ) 61,500,110 — Chloe on Union (fka Chloe) Seattle, WA G 2010 117 14,835,571 39,359,650 2,872,330 14,835,571 42,231,980 57,067,551 (6,417,475 ) 50,650,076 — Church Corner Cambridge, MA G 1987 85 5,220,000 16,744,643 3,414,899 5,220,000 20,159,542 25,379,542 (11,781,658 ) 13,597,884 — City Gate at Cupertino (fka Cupertino) Cupertino, CA — 1998 311 40,400,000 95,937,046 7,718,239 40,400,000 103,655,285 144,055,285 (33,293,690 ) 110,761,595 — City Square Bellevue (fka Bellevue) Bellevue, WA G 1998 191 15,100,000 41,876,257 3,956,888 15,100,000 45,833,145 60,933,145 (15,186,445 ) 45,746,700 — Clarendon, The Arlington, VA G 2005 292 30,400,340 103,824,660 2,799,573 30,400,340 106,624,233 137,024,573 (40,439,940 ) 96,584,633 — Cleo, The Los Angeles, CA — 1989 92 6,615,467 14,829,335 4,278,181 6,615,467 19,107,516 25,722,983 (10,359,000 ) 15,363,983 — Connecticut Heights Washington, D.C. — 1974 518 27,600,000 114,002,295 10,672,491 27,600,000 124,674,786 152,274,786 (38,864,851 ) 113,409,935 — Corcoran House at DuPont Circle (fka DuPont Circle) Washington, D.C. G 1961 138 13,500,000 26,913,113 4,106,014 13,500,000 31,019,127 44,519,127 (10,154,028 ) 34,365,099 — Courthouse Plaza Arlington, VA G 1990 396 — 87,386,024 6,926,335 — 94,312,359 94,312,359 (31,836,593 ) 62,475,766 — Creekside (San Mateo) San Mateo, CA — 1985 192 9,606,600 21,193,232 5,528,464 9,606,600 26,721,696 36,328,296 (19,983,009 ) 16,345,287 — Cronins Landing Waltham, MA G 1998 281 32,300,000 85,119,324 12,705,880 32,300,000 97,825,204 130,125,204 (31,367,886 ) 98,757,318 — Crystal Place Arlington, VA — 1986 181 17,200,000 47,918,975 4,101,843 17,200,000 52,020,818 69,220,818 (17,674,647 ) 51,546,171 — Dalton, The Alexandria, VA G 2018 270 22,947,777 95,334,754 95,439 22,947,777 95,430,193 118,377,970 (7,103,749 ) 111,274,221 — Deerwood (SD) San Diego, CA — 1990 316 2,082,095 18,739,815 16,342,739 2,082,095 35,082,554 37,164,649 (31,387,018 ) 5,777,631 — Del Mar Ridge San Diego, CA — 1998 181 7,801,824 36,948,176 4,478,037 7,801,824 41,426,213 49,228,037 (19,145,873 ) 30,082,164 — Eagle Canyon Chino Hills, CA — 1985 252 1,808,900 16,274,361 11,453,379 1,808,900 27,727,740 29,536,640 (21,958,570 ) 7,578,070 — Edge, The (fka 4885 Edgemoor Lane) Bethesda, MD — (F) — — 52,311,710 — — 52,311,710 52,311,710 — 52,311,710 — Edgemont at Bethesda Metro Bethesda, MD — 1989 122 13,092,552 43,907,448 2,485,329 13,092,552 46,392,777 59,485,329 (16,714,861 ) 42,770,468 — Emerson Place Boston, MA G 1962 444 14,855,000 57,566,636 36,095,829 14,855,000 93,662,465 108,517,465 (67,775,615 ) 40,741,850 — Encore at Sherman Oaks, The Sherman Oaks, CA — 1988 174 8,700,000 25,446,003 4,521,390 8,700,000 29,967,393 38,667,393 (11,941,930 ) 26,725,463 — Eviva on Cherokee Denver, CO — 2017 274 10,507,626 100,037,204 512,431 10,507,626 100,549,635 111,057,261 (10,488,698 ) 100,568,563 — EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation December 31, 2020 Description Initial Cost to Company Cost Capitalized Subsequent to Acquisition (Improvements, net) (E) Gross Amount Carried at Close of Period 12/31/20 Apartment Name Location Non-Residential Components 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 12/31/20 Encumbrances Fountains at Emerald Park (fka Emerald Park) Dublin, CA — 2000 324 25,900,000 83,986,217 4,735,333 25,900,000 88,721,550 114,621,550 (28,555,812 ) 86,065,738 — Fremont Center Fremont, CA G 2002 322 25,800,000 78,753,114 5,103,474 25,800,000 83,856,588 109,656,588 (27,673,493 ) 81,983,095 — Gaithersburg Station Gaithersburg, MD G 2013 400 17,500,000 74,678,917 4,636,691 17,500,000 79,315,608 96,815,608 (23,625,030 ) 73,190,578 — Gallery, The Hermosa Beach, CA — 1971 169 18,144,000 46,567,941 3,103,348 18,144,000 49,671,289 67,815,289 (26,326,719 ) 41,488,570 — Gateway at Malden Center Malden, MA G 1988 203 9,209,780 25,722,666 17,360,595 9,209,780 43,083,261 52,293,041 (28,698,550 ) 23,594,491 — Geary Court Yard San Francisco, CA — 1990 165 1,722,400 15,471,429 6,286,909 1,722,400 21,758,338 23,480,738 (16,463,219 ) 7,017,519 — Girard Boston, MA G 2016 160 — 102,450,328 921,575 — 103,371,903 103,371,903 (14,956,283 ) 88,415,620 — Hampshire Place Los Angeles, CA — 1989 259 10,806,000 30,335,330 8,663,329 10,806,000 38,998,659 49,804,659 (21,516,455 ) 28,288,204 — Harbor Steps Seattle, WA G 2000 761 59,403,601 158,829,432 43,131,840 59,403,601 201,961,272 261,364,873 (105,902,659 ) 155,462,214 — Hathaway Long Beach, CA — 1987 385 2,512,500 22,611,912 14,527,190 2,512,500 37,139,102 39,651,602 (28,554,178 ) 11,097,424 — Helios (fka 2nd+Pine) Seattle, WA G 2017 398 18,061,674 206,761,817 183,520 18,061,674 206,945,337 225,007,011 (28,336,441 ) 196,670,570 — Heritage at Stone Ridge Burlington, MA — 2005 180 10,800,000 31,808,335 3,054,858 10,800,000 34,863,193 45,663,193 (19,026,623 ) 26,636,570 — Heritage Ridge Lynwood, WA — 1999 197 6,895,000 18,983,597 4,683,392 6,895,000 23,666,989 30,561,989 (12,962,130 ) 17,599,859 — Hesby North Hollywood, CA — 2013 308 23,299,892 102,700,108 2,406,522 23,299,892 105,106,630 128,406,522 (28,701,909 ) 99,704,613 — Highlands at South Plainfield South Plainfield, NJ — 2000 252 10,080,000 37,526,912 2,930,209 10,080,000 40,457,121 50,537,121 (21,704,492 ) 28,832,629 — Hikari Los Angeles, CA G 2007 128 9,435,760 32,564,240 1,055,340 9,435,760 33,619,580 43,055,340 (12,719,419 ) 30,335,921 — Hillside ll Daly City, CA — (F) — — 1,892,874 — — 1,892,874 1,892,874 — 1,892,874 — Hudson Crossing New York, NY G 2003 259 23,420,000 69,977,699 3,305,385 23,420,000 73,283,084 96,703,084 (41,028,871 ) 55,674,213 — Hudson Pointe Jersey City, NJ — 2003 182 5,350,000 41,114,074 7,258,907 5,350,000 48,372,981 53,722,981 (28,021,673 ) 25,701,308 — Huxley, The Redwood City, CA — 2018 137 18,775,028 89,336,651 38,505 18,775,028 89,375,156 108,150,184 (7,124,237 ) 101,025,947 — Ivory Wood Bothell, WA — 2000 144 2,732,800 13,888,282 1,964,134 2,732,800 15,852,416 18,585,216 (9,126,262 ) 9,458,954 — Jia (fka Chinatown Gateway) Los Angeles, CA G 2014 280 14,791,831 78,218,492 917,303 14,791,831 79,135,795 93,927,626 (25,013,639 ) 68,913,987 — Junction 47 (fka West Seattle) Seattle, WA G 2015 206 11,726,305 56,584,312 256,046 11,726,305 56,840,358 68,566,663 (12,195,811 ) 56,370,852 — Kelvin, The (fka Modera) Irvine, CA — 2015 194 15,521,552 64,853,448 778,776 15,521,552 65,632,224 81,153,776 (15,146,860 ) 66,006,916 — Laguna Clara Santa Clara, CA — 1972 264 13,642,420 31,270,480 7,218,616 13,642,420 38,489,096 52,131,516 (21,078,780 ) 31,052,736 — Landings at Port Imperial W. New York, NJ — 1999 276 27,246,045 37,741,050 15,622,471 27,246,045 53,363,521 80,609,566 (35,393,712 ) 45,215,854 — Lane Seattle, WA G 2019 217 13,142,946 71,933,303 65,928 13,142,946 71,999,231 85,142,177 (4,558,633 ) 80,583,544 — Lex, The San Jose, CA — 2017 387 21,817,512 158,778,598 462,150 21,817,512 159,240,748 181,058,260 (15,000,565 ) 166,057,695 — Liberty Park Braintree, MA — 2000 202 5,977,504 26,749,111 7,808,575 5,977,504 34,557,686 40,535,190 (21,422,606 ) 19,112,584 — Liberty Tower Arlington, VA G 2008 235 16,382,822 83,817,078 4,517,251 16,382,822 88,334,329 104,717,151 (34,837,074 ) 69,880,077 — Lincoln Heights Quincy, MA — 1991 336 5,928,400 33,595,262 15,212,279 5,928,400 48,807,541 54,735,941 (39,401,499 ) 15,334,442 — Lofts at Kendall Square (fka Kendall Square) Cambridge, MA — 1998 186 18,696,674 78,445,657 7,530,710 18,696,674 85,976,367 104,673,041 (27,734,674 ) 76,938,367 — Lofts at Kendall Square ll (fka 249 Third Street) Cambridge, MA G 2019 84 4,603,326 44,438,432 (503 ) 4,603,326 44,437,929 49,041,255 (2,109,619 ) 46,931,636 — Longacre House New York, NY G 2000 293 73,170,045 53,962,510 5,401,688 73,170,045 59,364,198 132,534,243 (28,246,752 ) 104,287,491 — Longfellow Place Boston, MA G 1975 710 38,264,917 132,175,915 89,681,781 38,264,917 221,857,696 260,122,613 (163,889,861 ) 96,232,752 — Madox Jersey City, NJ G 2013 131 9,679,635 64,594,205 961,691 9,679,635 65,555,896 75,235,531 (7,494,654 ) 67,740,877 — Mantena New York, NY G 2012 98 22,346,513 61,501,158 1,480,793 22,346,513 62,981,951 85,328,464 (20,145,143 ) 65,183,321 — Marina 41 (fka Marina Del Rey) Marina Del Rey, CA — 1973 623 — 168,842,442 9,623,804 — 178,466,246 178,466,246 (59,646,703 ) 118,819,543 — Mariposa at Playa Del Rey (fka Playa Del Rey) Playa Del Rey, CA — 2004 354 60,900,000 89,311,482 7,039,392 60,900,000 96,350,874 157,250,874 (31,786,197 ) 125,464,677 — Mark on 8th Seattle, WA G 2016 174 23,004,387 51,148,861 172,242 23,004,387 51,321,103 74,325,490 (6,791,552 ) 67,533,938 — Market Street Village San Diego, CA — 2006 229 13,740,000 40,757,301 2,627,968 13,740,000 43,385,269 57,125,269 (22,558,686 ) 34,566,583 — Milano Lofts Los Angeles, CA G 1925/2006 99 8,125,216 27,378,784 4,435,789 8,125,216 31,814,573 39,939,789 (10,534,953 ) 29,404,836 — Mill Creek Milpitas, CA — 1991 516 12,858,693 57,168,503 18,006,191 12,858,693 75,174,694 88,033,387 (43,305,918 ) 44,727,469 — EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation December 31, 2020 Description Initial Cost to Company Cost Capitalized Subsequent to Acquisition (Improvements, net) (E) Gross Amount Carried at Close of Period 12/31/20 Apartment Name Location Non-Residential Components 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 12/31/20 Encumbrances Mosaic at Metro Hyattsville, MD — 2008 260 — 59,580,898 1,669,692 — 61,250,590 61,250,590 (25,749,117 ) 35,501,473 — Mountain View Redevelopment Mountain View, CA — (F) — — 1,630,338 — — 1,630,338 1,630,338 — 1,630,338 — Mozaic at Union Station Los Angeles, CA — 2007 272 8,500,000 52,529,446 2,595,464 8,500,000 55,124,910 63,624,910 (27,902,570 ) 35,722,340 — Murray Hill Tower (fka Murray Hill) New York, NY G 1974 270 75,800,000 102,705,401 11,586,703 75,800,000 114,292,104 190,092,104 (38,926,014 ) 151,166,090 — Next on Sixth Los Angeles, CA G 2017 398 52,509,906 136,635,650 161,352 52,509,906 136,797,002 189,306,908 (13,325,292 ) 175,981,616 — North Pier at Harborside Jersey City, NJ — 2003 297 4,000,159 94,290,590 7,943,309 4,000,159 102,233,899 106,234,058 (57,060,669 ) 49,173,389 — Northglen Valencia, CA — 1988 234 9,360,000 20,778,553 7,159,183 9,360,000 27,937,736 37,297,736 (17,739,770 ) 19,557,966 — Northpark Burlingame, CA — 1972 510 38,607,000 77,472,217 15,619,323 38,607,000 93,091,540 131,698,540 (43,765,024 ) 87,933,516 — Notch Newcastle, WA — 2020 158 5,463,324 43,490,989 5,378 5,463,324 43,496,367 48,959,691 (1,267,355 ) 47,692,336 — Oak Park Combined Agoura Hills, CA — 1989 & 1990 444 3,390,700 30,517,274 11,540,745 3,390,700 42,058,019 45,448,719 (35,268,612 ) 10,180,107 — Oaks Santa Clarita, CA — 2000 520 23,400,000 61,020,438 8,845,874 23,400,000 69,866,312 93,266,312 (41,469,709 ) 51,796,603 — Oakwood Crystal City Arlington, VA — 1987 162 15,400,000 35,474,336 4,223,339 15,400,000 39,697,675 55,097,675 (13,360,668 ) 41,737,007 — Ocean Crest Solana Beach, CA — 1986 146 5,111,200 11,910,438 5,063,378 5,111,200 16,973,816 22,085,016 (12,541,852 ) 9,543,164 — Odin (fka Tallman) Seattle, WA — 2015 301 16,807,519 64,519,515 95,579 16,807,519 64,615,094 81,422,613 (13,686,832 ) 67,735,781 — One Henry Adams San Francisco, CA G 2016 241 30,224,393 139,564,405 75,093 30,224,393 139,639,498 169,863,891 (22,296,095 ) 147,567,796 — One India Street (fka Oakwood Boston) Boston, MA G 1901 94 22,200,000 28,672,979 6,922,941 22,200,000 35,595,920 57,795,920 (11,405,705 ) 46,390,215 — Pacific Place Los Angeles, CA — 2008 430 32,250,000 110,750,000 2,166,746 32,250,000 112,916,746 145,166,746 (35,114,578 ) 110,052,168 — Packard Building Seattle, WA G 2010 61 5,911,041 19,954,959 1,230,863 5,911,041 21,185,822 27,096,863 (4,881,973 ) 22,214,890 — Parc 77 New York, NY G 1903 137 40,504,000 18,025,679 6,888,757 40,504,000 24,914,436 65,418,436 (14,944,137 ) 50,474,299 — Parc Cameron New York, NY G 1927 166 37,600,000 9,855,597 7,768,599 37,600,000 17,624,196 55,224,196 (12,262,578 ) 42,961,618 — Parc Coliseum New York, NY G 1910 177 52,654,000 23,045,751 9,759,837 52,654,000 32,805,588 85,459,588 (20,290,750 ) 65,168,838 — Parc East Towers New York, NY G 1977 324 102,163,000 108,989,402 13,101,902 102,163,000 122,091,304 224,254,304 (60,987,908 ) 163,266,396 — Parc on Powell (fka Parkside at Emeryville) Emeryville, CA G 2015 173 16,667,059 65,100,751 753,908 16,667,059 65,854,659 82,521,718 (14,664,513 ) 67,857,205 — Park Connecticut Washington, D.C. — 2000 142 13,700,000 59,087,519 2,161,224 13,700,000 61,248,743 74,948,743 (18,692,087 ) 56,256,656 — Park West (CA) Los Angeles, CA — 1987/1990 444 3,033,500 27,302,383 12,931,215 3,033,500 40,233,598 43,267,098 (32,562,373 ) 10,704,725 — Parkside Union City, CA — 1979 208 6,246,700 11,827,453 8,446,035 6,246,700 20,273,488 26,520,188 (14,157,450 ) 12,362,738 — Pearl, The (WA) Seattle, WA G 2008 80 6,972,585 26,527,415 1,126,346 6,972,585 27,653,761 34,626,346 (6,325,802 ) 28,300,544 — Pearl MDR (fka Oakwood Marina Del Rey) Marina Del Rey, CA G 1969 597 — 120,795,359 6,550,150 — 127,345,509 127,345,509 (43,885,705 ) 83,459,804 — Pegasus Los Angeles, CA G 1949/2003 322 18,094,052 81,905,948 7,302,934 18,094,052 89,208,882 107,302,934 (35,775,990 ) 71,526,944 — Playa Pacifica Hermosa Beach, CA — 1972 285 35,100,000 33,473,822 24,084,348 35,100,000 57,558,170 92,658,170 (34,060,220 ) 58,597,950 — Portofino Chino Hills, CA — 1989 176 3,572,400 14,660,994 3,963,453 3,572,400 18,624,447 22,196,847 (14,859,876 ) 7,336,971 — Portofino (Val) Valencia, CA — 1989 216 8,640,000 21,487,126 6,277,627 8,640,000 27,764,753 36,404,753 (18,614,995 ) 17,789,758 — Portside Towers Jersey City, NJ G 1992-1997 527 22,487,006 96,842,913 26,069,539 22,487,006 122,912,452 145,399,458 (93,853,487 ) 51,545,971 — Potrero 1010 San Francisco, CA G 2016 453 40,830,011 181,855,868 989,838 40,830,011 182,845,706 223,675,717 (33,782,465 ) 189,893,252 — Prado (fka Glendale) Glendale, CA — 1988 264 — 67,977,313 6,662,673 — 74,639,986 74,639,986 (24,014,696 ) 50,625,290 — Prime, The Arlington, VA — 2002 281 34,625,000 77,879,740 4,771,834 34,625,000 82,651,574 117,276,574 (35,430,836 ) 81,845,738 — Prism at Park Avenue South (fka 400 Park Avenue South) New York, NY G 2015 269 76,292,169 171,726,887 231,618 76,292,169 171,958,505 248,250,674 (38,979,951 ) 209,270,723 — Promenade at Town Center I & II Valencia, CA — 2001 564 28,200,000 69,795,915 12,726,006 28,200,000 82,521,921 110,721,921 (47,521,592 ) 63,200,329 — Providence Bothell, WA — 2000 200 3,573,621 19,055,505 5,058,503 3,573,621 24,114,008 27,687,629 (13,078,610 ) 14,609,019 — Quarry Hills Quincy, MA — 2006 316 26,900,000 84,411,162 4,822,863 26,900,000 89,234,025 116,134,025 (28,874,667 ) 87,259,358 — Radius Uptown Denver, CO — 2017 372 13,644,960 121,899,084 1,070,656 13,644,960 122,969,740 136,614,700 (14,861,159 ) 121,753,541 — Red 160 (fka Redmond Way) Redmond, WA G 2011 250 15,546,376 65,320,010 1,554,405 15,546,376 66,874,415 82,420,791 (22,940,448 ) 59,480,343 — Redmond Court Bellevue, WA — 1977 206 10,300,000 33,488,745 1,923,709 10,300,000 35,412,454 45,712,454 (12,697,765 ) 33,014,689 — EQUITY RESIDENTIAL ERP OPERATING LIMITED PARTNERSHIP Schedule III - Real Estate and Accumulated Depreciation December 31, 2020 Description Initial Cost to Company Cost Capitalized Subsequent to Acquisition (Improvements, net) (E) Gross Amount Carried at Close of Period 12/31/20 Apartment Name Location Non-Residential Components 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 12/31/20 Encumbrances Regency Palms Huntington Beach, CA — 1969 310 1,857,400 16,713,254 8,166,256 1,857,400 24,879,510 26,736,910 (20,072,599 ) 6,664,311 — Reserve at Clarendon Centre, The Arlington, VA G 2003 252 10,500,000 52,812,935 5,015,196 10,500,000 57,828,131 68,328,131 (34,812,389 ) 33,515,742 — Reserve at Eisenhower, The Alexandria, VA — 2002 226 6,500,000 34,585,060 5,104,139 6,500,000 39,689,199 46,189,199 (23,797,415 ) 22,391,784 — Reserve at Empire Lakes Rancho Cucamonga, CA — 2005 467 16,345,000 73,080,670 5,402,223 16,345,000 78,482,893 94,827,893 (41,826,076 ) 53,001,817 — Reserve at Fairfax Corner Fairfax, VA — 2001 652 15,804,057 63,129,051 13,200,537 15,804,057 76,329,588 92,133,645 (47,641,317 ) 44,492,328 — Reserve at Mountain View (fka Mountain View) Mountain View, CA — 1965 180 27,000,000 33,029,605 7,682,065 27,000,000 40,711,670 67,711,670 (14,792,142 ) 52,919,528 — Reserve at Potomac Yard Alexandria, VA — 2002 588 11,918,917 68,862,641 18,128,215 11,918,917 86,990,856 98,909,773 (49,807,938 ) 49,101,835 — Reserve at Town Center I-III (WA) Mill Creek, WA G 2001, 2009, 2014 584 16,768,705 77,623,664 9,950,448 16,768,705 87,574,112 104,342,817 (39,942,888 ) 64,399,929 — Residences at Westgate I (fka Westgate II) Pasadena, CA G 2014 252 17,859,785 109,261,438 603,327 17,859,785 109,864,765 127,724,550 (30,747,047 ) 96,977,503 — Residences at Westgate II (fka Westgate III) Pasadena, CA G 2015 88 12,118,248 40,486,467 119,401 12,118,248 40,605,868 52,724,116 (9,059,400 ) 43,664,716 — Rianna I & II Seattle, WA G 2000/2002 156 4,430,000 29,298,096 1,594,173 4,430,000 30,892,269 35,322,269 (13,558,016 ) 21,764,253 — Ridgewood Village I&II San Diego, CA — 1997 408 11,809,500 34,004,048 6,762,215 11,809,500 40,766,263 52,575,763 (29,418,122 ) 23,157,641 — Riva Terra I (fka Redwood Shores) Redwood City, CA — 1986 304 34,963,355 84,587,658 8,097,405 34,963,355 92,685,063 127,648,418 (31,553,572 ) 96,094,846 — Riva Terra II (fka Harborside) Redwood City, CA — 1986 149 17,136,645 40,536,531 4,063,635 17,136,645 44,600,166 61,736,811 (13,928,284 ) 47,808,527 — Riverpark Redmond, WA G 2009 321 14,355,000 80,894,049 4,803,736 14,355,000 85,697,785 100,052,785 (30,548,447 ) 69,504,338 — Rivington, The Hoboken, NJ — 1999 240 34,340,640 112,730,596 3,283,711 34,340,640 116,014,307 150,354,947 (15,662,554 ) 134,692,393 — Rosecliff II Quincy, MA — 2005 130 4,922,840 30,202,160 1,801,272 4,922,840 32,003,432 36,926,272 (12,228,816 ) 24,697,456 — Sakura Crossing Los Angeles, CA G 2009 230 14,641,990 42,858,010 1,561,995 14,641,990 44,420,005 59,061,995 (17,561,315 ) 41,500,680 — Saxton Seattle, WA G 2019 325 38,805,400 128,652,023 373,996 38,805,400 129,026,019 167,831,419 (9,518,028 ) 158,313,391 — Seventh & James Seattle, WA G 1992 96 663,800 5,974,803 4,639,194 663,800 10,613,997 11,277,797 (8,600,004 ) 2,677,793 — Sheffield Court Arlington, VA — 1986 597 3,342,381 31,337,332 18,847,422 3,342,381 50,184,754 53,527,135 (41,685,265 ) 11,841,870 — Siena Terrace Lake Forest, CA — 1988 356 8,900,000 24,083,024 8,661,820 8,900,000 32,744,844 41,644,844 (24,001,604 ) 17,643,240 — Skycrest Valencia, CA — 1999 264 10,560,000 25,574,457 6,581,900 10,560,000 32,156,357 42,716,357 (21,036,234 ) 21,680,123 — Skylark Union City, CA — 1986 174 1,781,600 16,731,916 5,763,877 1,781,600 22,495,793 24,277,393 (16,357,971 ) 7,919,422 — Skyview Rancho Santa Margarita, CA — 1999 260 3,380,000 21,952,863 6,109,768 3,380,000 28,062,631 31,442,631 (20,168,570 ) 11,274,061 — SoMa II San Francisco, CA — (F) — 29,406,606 5,913,784 — 29,406,606 5,913,784 35,320,390 — 35,320,390 — Sonterra at Foothill Ranch Foothill Ranch, CA — 1997 300 7,503,400 24,048,507 6,242,034 7,503,400 30,290,541 37,793,941 (22,570,636 ) 15,223,305 — South City Station (fka South San Francisco) San Francisco, CA G 2007 368 68,900,000 79,476,861 5,874,314 68,900,000 85,351,175 154,251,175 (27,619,642 ) 126,631,533 — Southwood Palo Alto, CA — 1985 100 6,936,600 14,324,069 7,029,392 6,936,600 21,353,461 28,290,061 (14,889,800 ) 13,400,261 — Springline Seattle, WA G 2016 136 9,163,667 47,910,981 462,653 9,163,667 48,373,634 57,537,301 (8,167,981 ) 49,369,320 — STOA Los Angeles, CA G 2017 237 25,326,048 79,976,031 466,898 25,326,048 80,442,929 105,768,977 (8,160,539 ) 97,6

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
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, 2020 and 2019, 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 $15,000 and $40,000 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 non-residential leases’ term at acquisition approximates the average remaining term of all acquired non-residential 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 At least quarterly, the Company 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 an impairment indicator exists, 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.
Impairment of Investments in Unconsolidated Entities	Impairment of Investments in Unconsolidated Entities At least quarterly, the Company evaluates its investments in unconsolidated entities, including any multifamily real estate assets held by a joint venture, for indicators of other than temporary impairment, considering whether there has been a change to events or circumstances that would impact recoverability of the Company’s investment as well as any changes with regards to the Company's intent and ability to hold the investment to recover its carrying value.
Cost Capitalization	Cost Capitalization See the Real Estate Assets and Depreciation of Investment in Real Estate During the years ended December 31, 2020, 2019 and 2018, the Company capitalized $12.1 million, $14.2 million and $13.2 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 non-residential leases is also recorded on a straight-line basis. Non-residential 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, non-residential and other lease income, which are accounted for under the lease standard effective January 1, 2019 (discussed below in Recently Adopted Accounting Pronouncements The Company is a lessor for its residential and non-residential 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 lease 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 lease 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 lease 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. • 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. See Note 8 for the Company’s rental income detail allocated between the lease and revenue recognition standards. The Company’s allowance for doubtful accounts (which offsets accounts receivable and is included within other assets on the consolidated balance sheets) and bad debt s (which reduce rental income on the consolidated statements of operations and comprehensive income) have historically been very modest, particularly in our residential business, given the quality of our resident base and asset class . However , due to the impact of the COVID-19 pandemic, the allowance for doubtful accounts and bad debt s became elevated during 2020 and will likely remain elevated in 2021 . In accordance with the lease standard, if we determine the lease payments are not probable of collection ( based on known troubled accounts, rent deferral plans granted, historical experience and other currently available evidence ) , we fully reserve for any unpaid amounts , deferred rent receivable, variable lease payments and straight-line receivable balances and recognize rental income only if cash is received. If the Company’s estimates of collectibility differ from the cash received, then the timing and amount of the Company’s reported revenue could be impacted. See Note 8 for additional details.
Share-Based Compensation	Share-Based Compensation The Company expenses share-based compensation for employee and trustee grants of 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.
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 at the EQR level. In addition, ERPOP generally is not liable for federal income taxes as the partners recognize their allocable 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. On March 27, 2020, the President signed into law the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”). The CARES Act was enacted to provide economic relief to companies and individuals in response to the COVID-19 pandemic. Included in the CARES Act are tax provisions which increase allowable interest expense deductions for 2019 and 2020 and increase the ability for taxpayers to use net operating losses. These provisions did not result in a material impact to the Company’s taxable income or tax liabilities. The CARES Act also allowed corporations to request accelerated refunds of their alternative minimum tax (“AMT”) credit. Prior to enactment of this provision, the remaining credits would have been refunded in installments in 2020, 2021 and 2022. We received a refund of our remaining $1.6 million in AMT credits during the year ended December 31, 2020. The Company’s provision for income and other tax expense (benefit) was as follows for the years ended December 31, 2020, 2019 and 2018 (amounts in thousands): Year Ended December 31, 2020 2019 2018 State and local income, franchise and excise tax (benefit) $ 852 $ 963 $ 878 Alternative minimum tax credit (benefit) (1) — (3,244 ) — Income and other tax expense (benefit) (2) $ 852 $ (2,281 ) $ 878 (1) As provided in recent tax legislation which repealed the AMT credit on corporations, in 2019 the Company claimed/received $1.6 million of refunds of various AMT credit carryovers generated in prior tax years. The provision originally allowed for carryover amounts to be refunded over four years, with 50% available in the first year. The remaining $1.6 million was received in 2020 as noted above. (2) All provisions for income tax amounts are current and none are deferred. During the years ended December 31, 2020, 2019 and 2018, the tax character of the Company’s dividends and distributions were as follows (unaudited): Year Ended December 31, 2020 (1) 2019 (2) 2018 (3) Tax character of dividends and distributions: Ordinary dividends $ 1.34739 $ 1.39604 $ 1.84454 Long-term capital gain 0.77923 0.61243 0.21423 Unrecaptured section 1250 gain 0.24838 0.23403 0.06498 Dividends and distributions per Common Share/Unit outstanding $ 2.37500 $ 2.24250 $ 2.12375 (1) The Company’s fourth quarter 2020 dividends and distributions of $0.6025 per Common Share/Unit outstanding will be included as taxable income in calendar year 2021. (2) The Company’s fourth quarter 2019 dividends and distributions of $0.5675 per Common Share/Unit outstanding was included as taxable income in calendar year 2020. (3 ) 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. The unaudited cost of land and depreciable property, net of accumulated depreciation, for federal income tax purposes as of December 31, 2020 and 2019 was approximately $13.8 billion and $13.7 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. In response to the COVID-19 pandemic, management evaluated whether its estimates, such as lease collectibility (discussed below in Recently Adopted Accounting Pronouncements
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 August 2020, the Financial Accounting Standards Board (“FASB”) issued an amendment to the debt and equity financial instruments standards which simplifies the accounting for convertible instruments and accounting for contracts in an entity’s own equity. Instead of being required to assess whether an equity contract permits settlement in unregistered shares, which may require a legal analysis under the securities laws, entities will only analyze whether cash settlements are explicitly required when registered shares are unavailable. As a result, such contracts may be classified in permanent rather than mezzanine equity, which may affect the way the Company’s OP Units are presented on its financial statements. The update is effective for the Company beginning on January 1, 2022, but early adoption is allowed beginning January 1, 2021. The Company is currently evaluating the impact of adopting the new standard on its consolidated results of operations and financial position. In March 2020, the FASB issued an amendment to the reference rate reform standard which provides the option for a limited period of time to ease the potential burden in accounting for, or recognizing the effects of, reference rate reform on contract modifications and hedge accounting. An example of such reform is the expected market transition from the London Interbank Offered Rate (“LIBOR”) and other interbank offered rates to alternative reference rates. Entities that make this optional expedient election would not have to remeasure the contracts at the modification date or reassess the accounting treatment if certain criteria are met and would continue applying hedge accounting for relationships affected by reference rate reform. The new standard was effective for the Company upon issuance and elections can be made through December 31, 2022. The Company is currently evaluating its options with regards to existing contracts and hedging relationships and the impact of adopting this update on its consolidated results of operations and financial position. Recently Adopted Accounting Pronouncements In April 2020, a FASB staff question and answer document was issued which intended to reduce the challenges of evaluating the enforceable rights and obligations of leases for concessions granted to lessees in response to the COVID-19 pandemic. We elected not to evaluate whether qualifying concessions provided by the Company in response to the COVID-19 pandemic are a lease modification, subject to the criteria that the total payments under the amended lease cannot result in a substantial increase in the rights of the lessor or obligations of the lessee. We also elected to treat the concessions as though they were contemplated as part of the existing contracts and therefore will not apply lease modification rules to the qualifying lease concession amendments. As such, deferrals deemed collectible are recorded as rental receivables with no change to timing of rental revenues and deferrals deemed non-collectible and abatements reduce rental revenues in the deferral/abatement period and cause rental revenues to effectively follow a cash basis related to the changes. The accounting elections provided by the FASB mainly apply to the Company’s non-residential leases and the majority of the amendments will not require a straight-line adjustment. See Note 8 for additional discussion. In February 2016, the FASB issued a lease 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 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. 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 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 lease 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 lease 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 lease 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 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 and financial position. In June 2016, the FASB issued a standard which requires companies to adopt a new approach for estimating credit losses on certain types of financial instruments, such as trade and other receivables and loans. The standard requires entities to estimate a lifetime expected credit loss for most financial instruments, including trade receivables. In November 2018, the FASB issued an amendment excluding operating lease receivables accounted for under the lease standard from the scope of the credit losses standard. The Company adopted this standard as required effective January 1, 2020 and it did not have a material effect on its consolidated results of operations and financial position. 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.
Other	Other The Company is the controlling partner in various consolidated partnerships owning 16 properties consisting of 3,399 apartment units having a noncontrolling interest balance of $4.7 million at December 31, 2020. 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 three properties having a noncontrolling interest deficit balance of $5.5 million. These three 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, 2020 , the Company estimates the value of Noncontrolling Interest distributions for these three properties would have been approximately $ 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 three 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, 2020 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, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Ownership Breakdown	The ownership breakdown includes (table does not include various uncompleted development properties): Properties Apartment Units Wholly Owned Properties 287 74,328 Master-Leased Property – Consolidated 1 162 Partially Owned Properties – Consolidated 16 3,399 304 77,889

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2020
Summary Of Significant Accounting Policies [Abstract]
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, 2020, 2019 and 2018 (amounts in thousands): Year Ended December 31, 2020 2019 2018 State and local income, franchise and excise tax (benefit) $ 852 $ 963 $ 878 Alternative minimum tax credit (benefit) (1) — (3,244 ) — Income and other tax expense (benefit) (2) $ 852 $ (2,281 ) $ 878 (1) As provided in recent tax legislation which repealed the AMT credit on corporations, in 2019 the Company claimed/received $1.6 million of refunds of various AMT credit carryovers generated in prior tax years. The provision originally allowed for carryover amounts to be refunded over four years, with 50% available in the first year. The remaining $1.6 million was received in 2020 as noted above. (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, 2020, 2019 and 2018, the tax character of the Company’s dividends and distributions were as follows (unaudited): Year Ended December 31, 2020 (1) 2019 (2) 2018 (3) Tax character of dividends and distributions: Ordinary dividends $ 1.34739 $ 1.39604 $ 1.84454 Long-term capital gain 0.77923 0.61243 0.21423 Unrecaptured section 1250 gain 0.24838 0.23403 0.06498 Dividends and distributions per Common Share/Unit outstanding $ 2.37500 $ 2.24250 $ 2.12375 (1) The Company’s fourth quarter 2020 dividends and distributions of $0.6025 per Common Share/Unit outstanding will be included as taxable income in calendar year 2021. (2) The Company’s fourth quarter 2019 dividends and distributions of $0.5675 per Common Share/Unit outstanding was included as taxable income in calendar year 2020. (3 ) 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.

Equity, Capital and Other Int_2

Equity, Capital and Other Interests (Tables)	12 Months Ended
	Dec. 31, 2020
Class Of Stock [Line Items]
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, 2020, 2019 and 2018: 2020 2019 2018 Common Shares Common Shares outstanding at January 1, 371,670,884 369,405,161 368,018,082 Common Shares Issued: Conversion of OP Units 122,505 313,940 131,477 Exercise of share options 239,695 1,745,050 1,056,388 Employee Share Purchase Plan (ESPP) 90,196 48,131 75,414 Restricted share grants, net 178,720 158,602 123,800 Common Shares outstanding at December 31, 372,302,000 371,670,884 369,405,161 Units Units outstanding at January 1, 13,731,315 13,904,035 13,768,438 Restricted unit grants, net 249,263 141,220 267,074 Conversion of OP Units to Common Shares (122,505 ) (313,940 ) (131,477 ) Units outstanding at December 31, 13,858,073 13,731,315 13,904,035 Total Common Shares and Units outstanding at December 31, 386,160,073 385,402,199 383,309,196 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, 2020, 2019 and 2018, respectively (amounts in thousands): 2020 2019 2018 Balance at January 1, $ 463,400 $ 379,106 $ 366,955 Change in market value (125,224 ) 82,283 13,922 Change in carrying value 775 2,011 (1,771 ) Balance at December 31, $ 338,951 $ 463,400 $ 379,106
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, 2020 and 2019: Amounts in thousands Annual Call Dividend Per December 31, December 31, Date (1) Share/Unit (2) 2020 2019 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, 2020 and 2019 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]
Class Of Stock [Line Items]
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, 2020, 2019 and 2018: 2020 2019 2018 General and Limited Partner Units General and Limited Partner Units outstanding at January 1, 385,402,199 383,309,196 381,786,520 Issued to General Partner: Exercise of EQR share options 239,695 1,745,050 1,056,388 EQR’s Employee Share Purchase Plan (ESPP) 90,196 48,131 75,414 EQR’s restricted share grants, net 178,720 158,602 123,800 Issued to Limited Partners: Restricted unit grants, net 249,263 141,220 267,074 General and Limited Partner Units outstanding at December 31, 386,160,073 385,402,199 383,309,196 Limited Partner Units Limited Partner Units outstanding at January 1, 13,731,315 13,904,035 13,768,438 Limited Partner restricted unit grants, net 249,263 141,220 267,074 Conversion of Limited Partner OP Units to EQR Common Shares (122,505 ) (313,940 ) (131,477 ) Limited Partner Units outstanding at December 31, 13,858,073 13,731,315 13,904,035 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, 2020
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, 2020 and 2019 (amounts in thousands): 2020 2019 Land $ 5,785,367 $ 5,936,188 Depreciable property: Buildings and improvements 18,464,484 18,904,686 Furniture, fixtures and equipment 1,970,033 1,916,458 In-Place lease intangibles 486,137 497,957 Projects under development: Land 23,531 23,531 Construction-in-progress 387,603 158,099 Land held for development: Land 46,160 64,460 Construction-in-progress 40,010 32,228 Investment in real estate 27,203,325 27,533,607 Accumulated depreciation (7,859,657 ) (7,276,786 ) Investment in real estate, net $ 19,343,668 $ 20,256,821
Acquired Properties From Unaffiliated Parties	During the year ended December 31, 2020, the Company acquired the following from unaffiliated parties (purchase price in thousands): Properties Apartment Units Purchase Price Rental Properties – Consolidated (1) 1 158 $ 48,860 Total 1 158 $ 48,860 (1) Purchase price includes an allocation of approximately $5.5 million to land and $43.4 million to depreciable property (inclusive of capitalized closing costs). 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
Disposed Properties to Unaffiliated Parties	During the year ended December 31, 2020, the Company disposed of the following to unaffiliated parties (sales price in thousands): Properties Apartment Units Sales Price Rental Properties – Consolidated 6 2,231 $ 1,066,861 Land Parcels (two) — — 55,510 Total 6 2,231 $ 1,122,371 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.

Commitments to Acquire_Dispos_2

Commitments to Acquire/Dispose of Real Estate (Tables)	12 Months Ended
	Dec. 31, 2020
Commitments To Acquire Dispose Of Real Estate [Abstract]
Agreements to Dispose	The Company has entered into an agreement to dispose the following (sales price and net book value in thousands): Properties Apartment Units Sales Price Net Book Value at December 31, 2020 Rental Properties – Consolidated 1 263 $ 84,250 $ 17,748 Total 1 263 $ 84,250 $ 17,748

Investments in Partially Owne_2

Investments in Partially Owned Entities (Tables)	12 Months Ended
	Dec. 31, 2020
Investments In Partially Owned Entities [Abstract]
Summary of Company's 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, 2020 December 31, 2020 December 31, 2019 Ownership Percentage Investments in Unconsolidated Entities: Operating Property (VIE) (1) $ 38,288 $ 40,361 33.3% Real Estate Technology (2) 14,866 12,318 Varies Other (372 ) (441 ) Varies Investments in Unconsolidated Entities $ 52,782 $ 52,238 (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) Represents unconsolidated investments in five separate real estate technology funds/companies.

Restricted Deposits (Tables)

Restricted Deposits (Tables)	12 Months Ended
	Dec. 31, 2020
Deposits Restricted [Abstract]
Restricted Deposits	The following table presents the Company’s restricted deposits as of December 31, 2020 and 2019 (amounts in thousands): December 31, 2020 December 31, 2019 Mortgage escrow deposits: Replacement reserves $ 9,877 $ 8,543 Mortgage principal reserves/sinking funds 14,168 9,689 Mortgage escrow deposits 24,045 18,232 Restricted cash: Tax-deferred (1031) exchange proceeds — 14,232 Restricted deposits on real estate investments 307 658 Resident security and utility deposits 31,412 37,140 Other 1,373 984 Restricted cash 33,092 53,014 Restricted deposits $ 57,137 $ 71,246

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Summary of Lease Income Types Relating to Lease Payments Along With the Total Other Rental Income	The following table presents the lease income types relating to lease payments for residential and non-residential leases along with the total other rental income for the years ended December 31, 2020 and 2019 (amounts in thousands): Year Ended December 31, 2020 Year Ended December 31, 2019 Income Type Residential Leases Non-Residential Leases Total Residential Leases Non-Residential Leases Total Residential and non-residential rent $ 2,336,778 $ 51,663 $ 2,388,441 $ 2,414,201 $ 71,988 $ 2,486,189 Utility recoveries (RUBS income) (1) 70,699 677 71,376 67,659 917 68,576 Parking rent 38,743 412 39,155 37,557 348 37,905 Storage rent 3,674 84 3,758 3,745 71 3,816 Pet rent 11,457 — 11,457 11,617 — 11,617 Total lease revenue $ 2,461,351 $ 52,836 2,514,187 $ 2,534,779 $ 73,324 2,608,103 Parking revenue 22,210 28,272 Other revenue 35,308 64,316 Total other rental income (2) 57,518 92,588 Rental income $ 2,571,705 $ 2,700,691 (1) RUBS income primarily consists of variable payments representing the recovery of utility costs from residents. (2 ) Other rental income is accounted for under the revenue recognition standard.
Summary of Residential and Non-Residential Accounts Receivable and Straight-Line Receivable Balances	The following table presents residential and non-residential accounts receivable and straight-line receivable balances for the Company’s properties as of December 31, 2020 and 2019 (amounts in thousands): Residential Non-Residential Balance Sheet (Other assets): December 31, 2020 December 31, 2019 December 31, 2020 December 31, 2019 Resident/tenant accounts receivable balances $ 30,856 $ 4,040 $ 7,598 $ 1,766 Allowance for doubtful accounts (24,021 ) (1,190 ) (6,527 ) (1,412 ) Net receivable balances $ 6,835 (1) $ 2,850 $ 1,071 $ 354 Straight-line receivable balances $ 19,992 $ 1,841 $ 13,413 $ 26,450 (1) The Company held residential security deposits approximating 31.6% of the net receivable balance at December 31, 2020.
Summary of Residential Bad Debt for Company's Properties	The following table presents residential bad debt for the Company’s properties for the years ended December 31, 2020 and 2019 (amounts in thousands): Year Ended December 31, Income Statement (Rental income): 2020 2019 Bad debt, net $ 42,505 $ 12,067 % of rental income 1.7 % 0.5 %
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, 2020 and 2019 (amounts in thousands): 2020 2019 Right-of-use assets: Corporate office leases (operating) $ 39,203 $ 41,596 Ground leases (finance) 57,584 57,982 Ground leases (operating) 402,500 413,196 Right-of-use assets $ 499,287 $ 512,774 Lease liabilities: Corporate office leases (operating) $ 40,470 $ 43,105 Ground leases (finance) 23,350 23,239 Ground leases (operating) 265,310 264,990 Lease liabilities $ 329,130 $ 331,334
Summary of Quantitative Disclosures for Lessees	The following tables illustrate the quantitative disclosures for lessees as of and for the years ended December 31, 2020 and 2019 (amounts in thousands): Year Ended December 31, 2020 Year Ended December 31, 2019 Lease cost: Finance lease cost: Amortization of right-of-use assets $ — $ — Interest on lease liabilities (capitalized) 1,029 225 Operating lease cost: Corporate office leases 3,747 3,937 Ground leases 22,102 22,198 Variable lease cost: Corporate office leases 1,307 1,489 Ground leases 3,304 3,700 Total lease cost $ 31,489 $ 31,549 December 31, 2020 December 31, 2019 Other information: Cash paid for amounts included in the measurement of lease liabilities: Investing cash flows from finance leases (capitalized) $ 567 $ 34,922 Operating cash flows from operating leases: Corporate office leases $ 5,296 $ 5,494 Ground leases $ 16,552 $ 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) 18.7 years 19.7 years Weighted-average remaining lease term – operating leases: Corporate office leases 17.4 years 18.1 years Ground leases 55.3 years 56.2 years Weighted-average discount rate – finance leases 3.0 % 3.0 % Weighted-average discount rate – operating leases: Corporate office leases 3.2 % 3.2 % Ground leases 5.0 % 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, 2020: (Payments)/Receipts Due by Year (in thousands) 2021 2022 2023 2024 2025 Thereafter Total Finance Leases: Minimum Rent Payments (a) $ (578 ) $ (590 ) $ (601 ) $ (614 ) $ (626 ) $ (33,224 ) $ (36,233 ) Operating Leases: Minimum Rent Payments (a) $ (17,160 ) $ (16,906 ) $ (16,997 ) $ (17,329 ) $ (17,375 ) $ (954,108 ) $ (1,039,875 ) Minimum Rent Receipts (b) $ 59,430 $ 54,656 $ 51,091 $ 45,166 $ 38,847 $ 126,732 $ 375,922 (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 non-residential 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, 2020 (amounts in thousands): 2020 Total minimum rent payments $ 1,076,108 Less: Lease discount 746,978 Lease liabilities $ 329,130

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020 and 2019, respectively (amounts in thousands): Mortgage notes payable, net as of December 31, 2019 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, 2020 Fixed Rate Debt: Secured – Conventional $ 1,574,699 $ 495,000 (2) $ (160,522 ) $ (7,759 ) $ 988 $ (1,315 ) $ 1,901,091 Floating Rate Debt: Secured – Conventional 7,050 24,204 — — — 240 31,494 Secured – Tax Exempt 359,861 — — — 1,246 198 361,305 Floating Rate Debt 366,911 24,204 — — 1,246 438 392,799 Total $ 1,941,610 $ 519,204 $ (160,522 ) $ (7,759 ) $ 2,234 $ (877 ) $ 2,293,890 (1 ) Represents amortization of deferred financing costs, net of debt financing costs. (2 ) Obtained a 2.60% fixed rate mortgage loan pool maturing on May 1, 2030. 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). The following table summarizes the Company’s debt extinguishment costs on mortgages recorded as additional interest expense during the years ended December 31, 2020 and 2019, respectively (amounts in thousands): Description 2020 2019 Prepayment premiums/penalties $ 327 $ 3,381 Write-offs of unamortized deferred financing costs 63 2,273 Write-offs of unamortized (premiums)/discounts/OCI (190 ) 6,153 Total $ 200 $ 11,807
Summary of Notes Activity	The following tables summarize the Company’s notes activity for the years ended December 31, 2020 and 2019, respectively (amounts in thousands): Notes, net as of December 31, 2019 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, 2020 Fixed Rate Debt: Unsecured – Public $ 6,077,513 $ — $ (750,000 ) $ — $ 2,997 $ 5,026 $ 5,335,536 (1) Represents amortization of deferred financing costs, net of debt financing costs. 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. The following table summarizes the Company’s debt extinguishment costs on notes recorded as additional interest expense during the years ended December 31, 2020 and 2019, respectively (amounts in thousands): Description 2020 2019 Prepayment premiums/penalties $ 25,823 $ 10,266 Write-offs of unamortized deferred financing costs 571 287 Write-offs of unamortized (premiums)/discounts/OCI 12,698 1,043 Total $ 39,092 $ 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, 2020 and 2019 (amounts in thousands): December 31, 2020 December 31, 2019 Unsecured revolving credit facility commitment $ 2,500,000 $ 2,500,000 Commercial paper balance outstanding (415,000 ) (1,000,000 ) Unsecured revolving credit facility balance outstanding — (20,000 ) Other restricted amounts (100,949 ) (100,929 ) Unsecured revolving credit facility availability $ 1,984,051 $ 1,379,071 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, 2020 and 2019, respectively (amounts in thousands): Description 2020 2019 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, 2020 (amounts in thousands): Year Total 2021 (1) $ 450,665 2022 296,040 2023 1,329,088 2024 6,100 2025 458,200 Thereafter 5,586,810 Subtotal 8,126,903 Deferred Financing Costs and Unamortized (Discount) (82,647 ) Total $ 8,044,256 (1) Includes $415.0 million 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, 2020 and 2019, respectively: December 31, 2020 December 31, 2019 Interest Rate Ranges 0.06% - 4.71% 0.10% - 5.29% Weighted Average Interest Rate 3.33% 3.84% Maturity Date Ranges 2021-2061 2020-2061
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, 2020 and 2019, respectively: December 31, 2020 December 31, 2019 Interest Rate Ranges 2.50% - 7.57% 2.50% - 7.57% Weighted Average Interest Rate 4.03% 4.21% Maturity Date Ranges 2023-2047 2021-2047

Derivative and Other Fair Val_2

Derivative and Other Fair Value Instruments (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Summary of Valuations for Each Type of Fair Value Measurement	The following table summarizes the inputs to the valuations for each type of fair value measurement: Fair Value Measurement Type Valuation Inputs Employee holdings (other than Common Shares) within the supplemental executive retirement plan (the “SERP”) Quoted market prices for identical assets. These holdings are included in other assets and other liabilities on the consolidated balance sheets. Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Quoted market price of Common Shares. Mortgage notes payable and private unsecured debt (including its commercial paper and line of credit, if applicable) Indicative rates provided by lenders of similar loans. Public unsecured notes Quoted market prices for each underlying issuance.
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, 2020 and 2019, respectively (amounts in thousands): December 31, 2020 December 31, 2019 Carrying Value Estimated Fair Value (Level 2) Carrying Value Estimated Fair Value (Level 2) Mortgage notes payable, net $ 2,293,890 $ 2,313,263 $ 1,941,610 $ 1,930,710 Unsecured debt, net 5,750,366 6,686,612 7,095,346 7,677,289 Total debt, net $ 8,044,256 $ 8,999,875 $ 9,036,956 $ 9,607,999
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, 2020 and 2019, respectively (amounts in thousands): Fair Value Measurements at Reporting Date Using Description Balance Sheet Location 12/31/2020 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 $ 160,293 $ 160,293 $ — $ — Liabilities Supplemental Executive Retirement Plan Other Liabilities $ 160,293 $ 160,293 $ — $ — Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Mezzanine $ 338,951 $ — $ 338,951 $ — 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 $ —
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, 2020, 2019 and 2018, respectively (amounts in thousands): December 31, 2020 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 N/A $ — N/A N/A $ — Total $ — $ — 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
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, 2020, 2019 and 2018, respectively (amounts in thousands): Effective Portion December 31, 2020 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 $ (1,190 ) Interest expense $ (35,087 ) Total $ (1,190 ) $ (35,087 ) 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 ) $ —

Earnings Per Share and Earnin_2

Earnings Per Share and Earnings Per Unit (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020 2019 2018 Numerator for net income per share – basic: Net income $ 962,501 $ 1,009,708 $ 685,192 Allocation to Noncontrolling Interests – Operating Partnership (34,010 ) (36,034 ) (24,939 ) Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (14,855 ) (3,297 ) (2,718 ) Preferred distributions (3,090 ) (3,090 ) (3,090 ) Numerator for net income per share – basic $ 910,546 $ 967,287 $ 654,445 Numerator for net income per share – diluted: Net income $ 962,501 $ 1,009,708 $ 685,192 Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (14,855 ) (3,297 ) (2,718 ) Preferred distributions (3,090 ) (3,090 ) (3,090 ) Numerator for net income per share – diluted $ 944,556 $ 1,003,321 $ 679,384 Denominator for net income per share – basic and diluted: Denominator for net income per share – basic 371,791 370,461 368,052 Effect of dilutive securities: OP Units 13,003 12,907 12,869 Long-term compensation shares/units 1,080 2,965 2,774 Denominator for net income per share – diluted 385,874 386,333 383,695 Net income per share – basic $ 2.45 $ 2.61 $ 1.78 Net income per share – diluted $ 2.45 $ 2.60 $ 1.77
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, 2020 2019 2018 Numerator for net income per Unit – basic and diluted: Net income $ 962,501 $ 1,009,708 $ 685,192 Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (14,855 ) (3,297 ) (2,718 ) Allocation to Preference Units (3,090 ) (3,090 ) (3,090 ) Numerator for net income per Unit – basic and diluted $ 944,556 $ 1,003,321 $ 679,384 Denominator for net income per Unit – basic and diluted: Denominator for net income per Unit – basic 384,794 383,368 380,921 Effect of dilutive securities: Dilution for Units issuable upon assumed exercise/vesting of the Company’s long-term compensation shares/units 1,080 2,965 2,774 Denominator for net income per Unit – diluted 385,874 386,333 383,695 Net income per Unit – basic $ 2.45 $ 2.61 $ 1.78 Net income per Unit – diluted $ 2.45 $ 2.60 $ 1.77

Share Incentive Plans (Tables)

Share Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
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 Valuation Method of Share Options	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 Options was estimated at the time the Options were granted using the Black-Scholes option pricing model with the primary grant in each year having the following weighted average assumptions: 2020 2019 2018 Expected volatility (1) 15.2 % 16.3 % 14.8 % Expected life (2) 5 years 5 years 5 years Expected dividend yield (3) 3.04 % 3.10 % 3.09 % Risk-free interest rate (4) 1.32 % 2.43 % 2.52 % Option valuation per share $ 7.23 $ 8.06 $ 6.15 (1) Expected volatility – Estimated based on the historical five-year (2) Expected life – Approximates the actual weighted average life of all 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.
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 years ended December 31, 2020, 2019 and 2018. Year Ended December 31, 2020 Compensation Expense Compensation Capitalized Restricted Units/Options In-Lieu of Bonus (1) Compensation Equity Dividends Incurred Restricted shares (2) $ 10,053 $ 1,172 $ — $ 11,225 $ 1,172 Restricted units (2) 10,103 80 1,743 11,926 1,855 Options 2,156 193 — 2,349 — ESPP discount 862 82 — 944 — Total $ 23,174 $ 1,527 $ 1,743 $ 26,444 $ 3,027 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 (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 percenta ge of their annual cash bonus. (2) Includes LTI plan awards granted under the executive compensation program.
Award Activity of the Share Incentive Plans	The table below summarizes the Award activity of the Share Incentive Plans for the three years ended December 31, 2020, 2019 and 2018 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, 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 Awards granted (1) (5) 317,731 $ 76.26 179,911 $ 77.44 249,263 $ 72.00 Awards exercised/vested (2) (3) (4) (239,695 ) $ 50.31 (131,792 ) $ 66.32 (227,747 ) $ 68.47 Awards forfeited (1,344 ) $ 72.69 (1,191 ) $ 73.45 — $ — Awards expired (1,484 ) $ 47.18 — $ — — $ — Balance at December 31, 2020 5,642,752 $ 56.91 353,634 $ 71.81 879,800 $ 66.78 (1) The weighted average grant date fair value for Options granted during the years ended December 31, 2020, 2019 and 2018 was $6.74 per share, $8.05 per share and $6.17 per share, respectively. (2) The aggregate intrinsic value of Options exercised during the years ended December 31, 2020, 2019 and 2018 was $7.6 million, $58.1 million and $42.9 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, 2020, 2019 and 2018 was $10.6 million, $11.1 million and $11.5 million, respectively. (4) The fair value of restricted units vested during the years ended December 31, 2020, 2019 and 2018 was $18.7 million, $29.1 million and $1.8 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, 2020 (aggregate intrinsic value is in thousands): Options Weighted Average Remaining Contractual Life in Years Weighted Average Exercise Price Aggregate Intrinsic Value (1) Options Outstanding 5,642,752 4.64 $ 56.91 $ 26,881 Options Exercisable 4,985,668 4.16 $ 55.12 $ 26,804 Vested and expected to vest 648,552 8.32 $ 70.40 $ 77 (1) The aggregate intrinsic values were calculated as the excess, if any, between the Company’s closing share price of $ 59.28 per share on December 31, 2020 and the strike price of the underlying awards.
LTI Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Weighted Average Fair Value for Each Restricted Share/Unit	The grant date fair value of the TSR portion of the LTI awards is estimated using a multifactor Monte Carlo model to determine share prices for an absolute award for which the payout of the award only depends on EQR’s TSR and a set of relative awards for which the payout of the award depends on the spread of EQR’s TSR to the TSR of two indices: (a) the FTSE Nareit Apartment Index; and (b) the FTSE Nareit Equity Index. The grant date fair value of the Normalized FFO portion of the LTI awards is estimated using the closing price of EQR Common Shares on the grant date for the restricted shares and a discounted closing price of EQR Common Shares on the grant date for the restricted units to reflect the “book-up” and liquidity risk inherent in the units. The individual prices determined above are then weighted to arrive at the final values for each restricted share/unit as follows: 2020 2019 2018 Weighted average fair value per restricted share $ 75.89 $ 65.36 $ 63.86 Weighted average fair value per restricted unit $ 72.69 $ 63.12 $ 62.20

Employee Plans (Tables)

Employee Plans (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020 2019 2018 Shares issued 90,196 48,131 75,414 Issuance price ranges $46.23 – $63.84 $59.56 – $72.91 $47.80 – $57.09 Issuance proceeds $4,508 $3,116 $3,879

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020: (Payments)/Receipts Due by Year (in thousands) 2021 2022 2023 2024 2025 Thereafter Total Other Long-Term Liabilities: Deferred Compensation (1) $ (769 ) $ (1,130 ) $ (1,005 ) $ (723 ) $ (723 ) $ (3,976 ) $ (8,326 ) (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, 2020
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, 2020, 2019 and 2018, respectively (amounts in thousands): Year Ended December 31, 2020 2019 2018 Rental income $ 2,571,705 $ 2,700,691 $ 2,577,681 Property and maintenance expense (440,998 ) (446,845 ) (429,335 ) Real estate taxes and insurance expense (381,562 ) (366,139 ) (357,814 ) Total operating expenses (822,560 ) (812,984 ) (787,149 ) Net operating income $ 1,749,145 $ 1,887,707 $ 1,790,532
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, 2020, 2019 and 2018, respectively, as well as total assets and capital expenditures at December 31, 2020 and 2019, respectively (amounts in thousands): Year Ended December 31, 2020 Year Ended December 31, 2019 Year Ended December 31, 2018 Rental Income Operating Expenses NOI Rental Income Operating Expenses NOI Rental Income Operating Expenses NOI Same store (1) Los Angeles $ 468,450 $ 145,342 $ 323,108 $ 485,084 $ 144,314 $ 340,770 $ 451,592 $ 129,455 $ 322,137 Orange County 105,236 24,545 80,691 105,087 24,359 80,728 101,198 24,468 76,730 San Diego 74,737 18,176 56,561 73,698 17,889 55,809 91,971 24,024 67,947 Subtotal - Southern California 648,423 188,063 460,360 663,869 186,562 477,307 644,761 177,947 466,814 San Francisco 451,724 119,183 332,541 473,102 115,702 357,400 463,492 112,331 351,161 Washington D.C. 389,533 120,533 269,000 394,171 119,419 274,752 403,761 123,345 280,416 New York 426,016 198,228 227,788 464,270 191,514 272,756 444,112 178,055 266,057 Seattle 245,559 71,003 174,556 252,311 68,717 183,594 200,222 55,871 144,351 Boston 240,158 71,611 168,547 253,297 70,875 182,422 218,778 60,409 158,369 Other Markets 17,605 4,858 12,747 18,215 4,713 13,502 1,940 658 1,282 Total same store 2,419,018 773,479 1,645,539 2,519,235 757,502 1,761,733 2,377,066 708,616 1,668,450 Non-same store/other (2) (3) Non-same store 116,103 35,952 80,151 58,751 17,702 41,049 103,688 36,874 66,814 Other (3) 36,584 13,129 23,455 122,705 37,780 84,925 96,927 41,659 55,268 Total non-same store/other 152,687 49,081 103,606 181,456 55,482 125,974 200,615 78,533 122,082 Totals $ 2,571,705 $ 822,560 $ 1,749,145 $ 2,700,691 $ 812,984 $ 1,887,707 $ 2,577,681 $ 787,149 $ 1,790,532 (1) For the years ended December 31, 2020 and 2019, same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2019, less properties subsequently sold, which represented 73,585 apartment units. For the year ended December 31, 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. (2) For the years ended December 31, 2020 and 2019, non-same store primarily includes properties acquired after January 1, 2019, plus any properties in lease-up and not stabilized as of January 1, 2019. For the year ended December 31, 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. (3) Other includes development, other corporate operations and operations prior to disposition for properties sold. Year Ended December 31, 2020 Year Ended December 31, 2019 Total Assets Capital Expenditures Total Assets Capital Expenditures Same store (1) Los Angeles $ 3,007,621 $ 22,817 $ 3,110,659 $ 32,611 Orange County 389,007 7,260 404,545 9,276 San Diego 242,429 3,430 252,051 3,947 Subtotal - Southern California 3,639,057 33,507 3,767,255 45,834 San Francisco 3,233,901 18,983 3,345,882 25,925 Washington D.C. 3,066,702 23,626 3,174,721 22,409 New York 3,950,286 25,609 4,004,078 26,976 Seattle 1,802,952 11,372 1,871,232 22,023 Boston 1,758,665 18,367 1,822,373 27,267 Denver 247,133 817 255,974 701 Total same store 17,698,696 132,281 18,241,515 171,135 Non-same store/other (2) (3) Non-same store 1,664,892 2,627 1,681,367 1,864 Other (3) 923,303 1,071 1,249,887 5,424 Total non-same store/other 2,588,195 3,698 2,931,254 7,288 Totals $ 20,286,891 $ 135,979 $ 21,172,769 $ 178,423 (1) Same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2019, less properties subsequently sold, which represented 73,585 apartment units. (2) Non-same store primarily includes properties acquired after January 1, 2019, plus any properties in lease-up and not stabilized as of January 1, 2019. (3) Other includes development, other corporate operations and capital expenditures for properties sold.

Business - Additional Informati

Business - Additional Information (Details)	Dec. 31, 2020StatePropertyApartmentUnit
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Number of states in which entity operates | State	9
Properties | Property	304
Apartment units | ApartmentUnit	77,889
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, 2020PropertyApartmentUnit
Property/Unit schedule
Properties | Property	304
Apartment Units | ApartmentUnit	77,889
Wholly Owned Properties
Property/Unit schedule
Properties | Property	287
Apartment Units | ApartmentUnit	74,328
Master-Leased Property Consolidated
Property/Unit schedule
Properties | Property	1
Apartment Units | ApartmentUnit	162
Partially Owned Properties – Consolidated
Property/Unit schedule
Properties | Property	16
Apartment Units | ApartmentUnit	3,399

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020USD ($)PropertyApartmentUnit$ / shares	Dec. 31, 2019USD ($)$ / shares	Dec. 31, 2018USD ($)$ / shares	Jan. 01, 2019USD ($)
Value of furniture and fixtures minimum range	$ 15,000
Value of furniture and fixtures maximum range	$ 40,000
Lease intangibles, average term	6 months
Capitalized costs development and renovation	$ 12,100,000	$ 14,200,000	$ 13,200,000
Lessee, finance lease, description	The Company is a lessor for its residential and non-residential 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 lease 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
Provision for income tax	$ 852,000	$ (2,281,000)	$ 878,000
Remaining AMT refund received	1,600,000
Land and depreciable property net	13,800,000,000	13,700,000,000
Right-of-use assets	499,287,000	512,774,000		$ 434,200,000
Lease liabilities	$ 329,130,000	331,334,000		$ 278,300,000
Properties | Property	304
Noncontrolling Interests – Partially Owned Properties	$ 4,673,000	$ 1,183,000
Apartment units | ApartmentUnit	77,889
Partially Owned Properties – Consolidated
Properties | Property	16
Noncontrolling Interests – Partially Owned Properties	$ 4,700,000
Apartment units | ApartmentUnit	3,399
Limited Life Partnership Properties [Member]
Properties | Property	3
Noncontrolling Interests – Partially Owned Properties	$ (5,500,000)
Noncontrolling interests settlement value	72,800,000
Federal [Member]
Provision for income tax	$ 0
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 Tax (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary Of Significant Accounting Policies [Abstract]
State and local income, franchise and excise tax (benefit)	$ 852	$ 963	$ 878
Alternative minimum tax credit (benefit)		(3,244)
Income and other tax expense (benefit)	$ 852	$ (2,281)	$ 878
Tax Treatment Of Dividends And Distributions Ordinary Dividends	$ 1.34739	$ 1.39604	$ 1.84454
Tax Treatment Of Dividends And Distributions Long Term Capital Gain	0.77923	0.61243	0.21423
Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain	0.24838	0.23403	0.06498
Dividends and distributions declared per Common Share outstanding	$ 2.37500	$ 2.24250	$ 2.12375

Summary of Significant Accoun_6

Summary of Significant Accounting Policies Tax (Parenthetical) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2018
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
Dividend payable common share/unit, per share	$ 0.5675	$ 0.6025	$ 0.54

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity Capital And Other Interests [Abstract]
Common Stock, Shares, Outstanding	371,670,884	369,405,161	368,018,082
Common Shares Issued:
Conversion of OP Units	122,505	313,940	131,477
Exercise of share options	239,695	1,745,050	1,056,388
Employee Share Purchase Plan (ESPP)	90,196	48,131	75,414
Restricted share grants, net	178,720	158,602	123,800
Common Stock, Shares, Outstanding	372,302,000	371,670,884	369,405,161
Units
Total Units Outstanding	13,731,315	13,904,035	13,768,438
Restricted unit grants, net	249,263	141,220	267,074
Conversion of OP Units to Common Shares	(122,505)	(313,940)	(131,477)
Total Units Outstanding	13,858,073	13,731,315	13,904,035
Common Shares And Units Outstanding	386,160,073	385,402,199	383,309,196
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, 2020	Dec. 31, 2019	Dec. 31, 2018
General and Limited Partner Units
Common Shares And Units Outstanding	385,402,199	383,309,196
Exercise of share options	239,695	1,745,050	1,056,388
Employee Share Purchase Plan (ESPP)	90,196	48,131	75,414
Restricted share grants, net	178,720	158,602	123,800
Restricted unit grants, net	249,263	141,220	267,074
Common Shares And Units Outstanding	386,160,073	385,402,199	383,309,196
Limited Partner Units
Total Units Outstanding	13,731,315	13,904,035	13,768,438
Restricted unit grants, net	249,263	141,220	267,074
Conversion of Limited Partner OP Units to EQR Common Shares	(122,505)	(313,940)	(131,477)
Total Units Outstanding	13,858,073	13,731,315	13,904,035
Units Ownership Interest in Operating Partnership	3.60%	3.60%	3.60%
ERPOP [Member]
General and Limited Partner Units
Common Shares And Units Outstanding	385,402,199	383,309,196	381,786,520
Exercise of share options	239,695	1,745,050	1,056,388
Employee Share Purchase Plan (ESPP)	90,196	48,131	75,414
Restricted share grants, net	178,720	158,602	123,800
Restricted unit grants, net	249,263	141,220	267,074
Common Shares And Units Outstanding	386,160,073	385,402,199	383,309,196
Limited Partner Units
Total Units Outstanding	13,731,315	13,904,035	13,768,438
Restricted unit grants, net	249,263	141,220	267,074
Conversion of Limited Partner OP Units to EQR Common Shares	(122,505)	(313,940)	(131,477)
Total Units Outstanding	13,858,073	13,731,315	13,904,035
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, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity Capital And Other Interests [Abstract]
Redeemable noncontrolling interests - operating partnership	$ 338,951	$ 463,400	$ 379,106	$ 366,955
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, par or stated value per share	$ 0.01	$ 0.01

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity Capital And Other Interests [Abstract]
Redeemable Noncontrolling Interests - Operating Partnership Units	$ 463,400	$ 379,106	$ 366,955
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership	(125,224)	82,283	13,922
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	775	2,011	(1,771)
Redeemable Noncontrolling Interests - Operating Partnership Units	$ 338,951	$ 463,400	$ 379,106

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity Capital And Other Interests [Abstract]
Redeemable Limited Partners	$ 463,400	$ 379,106	$ 366,955
Limited Partners Change In Redemption Value	(125,224)	82,283	13,922
Limited Partners Change In Carrying Value	775	2,011	(1,771)
Redeemable Limited Partners	$ 338,951	$ 463,400	$ 379,106

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, 2020	Dec. 31, 2019
Class Of Stock [Line Items]
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, 2020 and 2019	$ 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/unit; 745,600 shares/units issued and outstanding as of December 31, 2020 and 2019	$ 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, 2020	Dec. 31, 2019
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)	83 Months Ended	156 Months Ended
	Dec. 31, 2020shares	Dec. 31, 2020shares
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, 2020	Dec. 31, 2019
Land	$ 5,785,367	$ 5,936,188
Depreciable property:
Buildings and improvements	18,464,484	18,904,686
Furniture, fixtures and equipment	1,970,033	1,916,458
In-Place lease intangibles	486,137	497,957
Projects under development:
Projects under development	411,134	181,630
Land held for development:
Land held for development	86,170	96,688
Investment in real estate	27,203,325	27,533,607
Accumulated depreciation	(7,859,657)	(7,276,786)
Investment in real estate, net	19,343,668	20,256,821
Land [Member]
Projects under development:
Projects under development	23,531	23,531
Land held for development:
Land held for development	46,160	64,460
Construction-in-progress [Member]
Projects under development:
Projects under development	387,603	158,099
Land held for development:
Land held for development	$ 40,010	$ 32,228

Real Estate - Acquired Properti

Real Estate - Acquired Properties From Unaffiliated Parties (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)PropertyApartmentUnit	Dec. 31, 2019USD ($)PropertyApartmentUnit
Properties acquired | Property	1	13
Property Units acquired | ApartmentUnit	158	3,540
Purchase Price	$ 48,860	$ 1,514,521
Rental Properties – Consolidated [Member]
Properties acquired | Property	1	13
Property Units acquired | ApartmentUnit	158	3,540
Purchase Price	$ 48,860	$ 1,494,689
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, 2020	Dec. 31, 2019
Purchase price	$ 48,860	$ 1,514,521
Land [Member]
Purchase price	5,500	268,300
Depreciable Property [Member]
Purchase price	$ 43,400	1,229,000
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, 2020USD ($)PropertyApartmentUnit	Dec. 31, 2019USD ($)PropertyApartmentUnit
Properties disposed | Property	6	13
Property Units disposed | ApartmentUnit	2,231	3,306
Sales Price	$ 1,122,371	$ 1,477,275
Rental Properties – Consolidated [Member]
Properties disposed | Property	6	11
Property Units disposed | ApartmentUnit	2,231	2,361
Sales Price	$ 1,066,861	$ 1,080,675
Rental Properties – Unconsolidated [Member]
Properties disposed | Property		2
Property Units disposed | ApartmentUnit		945
Sales Price		$ 394,500
Land Parcels [Member]
Sales Price	$ 55,510	$ 2,100

Real Estate - Additional Inform

Real Estate - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)Building
Net gain on sales of real estate properties	$ 531,807	$ 447,637	$ 256,810
Net gain on sales of land parcels	$ 34,234	2,044	987
Net gain on sales of unconsolidated entities		$ 69,500
Non-cash asset impairment charge			$ 702
San Francisco [Member]
Number of buildings damaged due to fire | Building			1

Real Estate - Disposed Proper_2

Real Estate - Disposed Properties to Unaffiliated Parties (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net sales proceeds of unconsolidated rental properties	$ 1,113,972	$ 1,064,619	$ 691,526
Rental Properties – Unconsolidated [Member]
Ownership percentage		20.00%
Net sales proceeds of unconsolidated rental properties		$ 78,300

Commitments to Acquire_Dispos_3

Commitments to Acquire/Dispose of Real Estate - Agreements to Dispose (Details) $ in Thousands	Dec. 31, 2020USD ($)PropertyApartmentUnit
Property/Unit schedule
Properties | Property	1
Apartment Units | ApartmentUnit	263
Sales Price	$ 84,250
Net Book Value at December 31, 2020	$ 17,748
Rental Properties Disposed [Member] | Wholly Owned Properties [Member]
Property/Unit schedule
Properties | Property	1
Apartment Units | ApartmentUnit	263
Sales Price	$ 84,250
Net Book Value at December 31, 2020	$ 17,748

Investments in Partially Owne_3

Investments in Partially Owned Entities - Consolidated Variable Interest Entities ("VIEs") - Additional Information (Details) $ in Thousands	Dec. 31, 2020USD ($)PropertyApartmentUnit	Dec. 31, 2019USD ($)
Variable Interest Entity [Line Items]
Properties | Property	304
Apartment units | ApartmentUnit	77,889
Total assets	$ 20,286,891	$ 21,172,769
Total liabilities	$ 9,184,454	10,164,843
Consolidated VIE [Member]
Variable Interest Entity [Line Items]
Properties | Property	16
Apartment units | ApartmentUnit	3,399
Total assets	$ 784,100	754,700
Total liabilities	$ 224,000	$ 323,100

Investments in Partially Owne_4

Investments in Partially Owned Entities - Summary of Companys Investment in Unconsolidated Entities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	$ 52,782	$ 52,238
Real Estate Technology [Member]
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	14,866	12,318
Other [Member]
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	(372)	(441)
Unconsolidated VIE [Member] | Operating Property [Member]
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	$ 38,288	$ 40,361
Ownership Percentage	33.30%

Investments in Partially Owne_5

Investments in Partially Owned Entities - Summary of Companys Investment in Unconsolidated Entities (Parenthetical) (Details) - Entity	Dec. 31, 2020	Dec. 31, 2019
Real Estate Technology [Member]
Variable Interest Entity [Line Items]
Number of separate unconsolidated investment funds/Companies	5	5

Restricted Deposits - Restricte

Restricted Deposits - Restricted Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Mortgage escrow deposits:
Replacement reserves	$ 9,877	$ 8,543
Mortgage principal reserves/sinking funds	14,168	9,689
Mortgage escrow deposits	24,045	18,232
Restricted cash:
Tax-deferred (1031) exchange proceeds		14,232
Restricted deposits on real estate investments	307	658
Resident security and utility deposits	31,412	37,140
Other	1,373	984
Restricted cash	33,092	53,014
Restricted deposits	$ 57,137	$ 71,246	$ 68,871

Leases - Additional Information

Leases - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)PropertyCorporateOfficeLease	Dec. 31, 2019
Corporate Office Leases [Member]
Operating Leased Assets [Line Items]
Number of operating leases | CorporateOfficeLease	9
Ground Leases [Member]
Operating Leased Assets [Line Items]
Unsecured borrowing rates for actual pricing period used for calculating discount rate	30 years
Number of operating properties | Property	14
COVID-19 [Member]
Operating Leased Assets [Line Items]
Write-off of straight-line rent receivables	$ 13.2
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	98.00%	97.00%
Residential Apartment Leases [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Retail leases term	12 months
Non-residential Leases [Member]
Operating Leased Assets [Line Items]
Percentage of rental income	2.00%	3.00%
Decrease in rental revenues	$ 7.3
Non-residential Leases [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Retail leases term	10 years
Non-residential 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 Along With the Total Other Rental Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Leased Assets [Line Items]
Total lease revenue	$ 2,514,187	$ 2,608,103
Rental income	2,571,705	2,700,691	$ 2,577,681
Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	2,461,351	2,534,779
Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	52,836	73,324
Residential and Non-Residential Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	2,388,441	2,486,189
Residential and Non-Residential Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	2,336,778	2,414,201
Residential and Non-Residential Rent [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	51,663	71,988
Utility Recoveries (RUBS Income) [Member]
Operating Leased Assets [Line Items]
Total lease revenue	71,376	68,576
Utility Recoveries (RUBS Income) [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	70,699	67,659
Utility Recoveries (RUBS Income) [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	677	917
Parking Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	39,155	37,905
Parking Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	38,743	37,557
Parking Rent [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	412	348
Storage Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	3,758	3,816
Storage Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	3,674	3,745
Storage Rent [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	84	71
Pet Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	11,457	11,617
Pet Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	11,457	11,617
Parking Revenue
Operating Leased Assets [Line Items]
Rental income	22,210	28,272
Other Revenue
Operating Leased Assets [Line Items]
Rental income	35,308	64,316
Other Rental Income [Member]
Operating Leased Assets [Line Items]
Rental income	$ 57,518	$ 92,588

Leases - Summary of Residential

Leases - Summary of Residential and Non-Residential Accounts Receivable and Straight-Line Receivable Balances (Details) - Other Assets [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Residential Leases [Member]
Operating Leased Assets [Line Items]
Resident/tenant accounts receivable balances	$ 30,856	$ 4,040
Allowance for doubtful accounts	(24,021)	(1,190)
Net receivable balances	6,835	2,850
Straight-line receivable balances	19,992	1,841
Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Resident/tenant accounts receivable balances	7,598	1,766
Allowance for doubtful accounts	(6,527)	(1,412)
Net receivable balances	1,071	354
Straight-line receivable balances	$ 13,413	$ 26,450

Leases - Summary of Residenti_2

Leases - Summary of Residential and Non-Residential Accounts Receivable and Straight-Line Receivable Balances (Parenthetical) (Details)	Dec. 31, 2020
Leases [Abstract]
Holding percentage of residential security deposits of net receivable	31.60%

Leases - Summary of Residenti_3

Leases - Summary of Residential Bad Debt for Company's Properties (Details) - Residential Leases [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lessor Lease Description [Line Items]
Bad debt, net	$ 42,505	$ 12,067
Rental Income [Member]
Lessor Lease Description [Line Items]
% of rental income	1.70%	0.50%

Leases - Summary of Right-of-Us

Leases - Summary of Right-of-Use Assets and Related Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Operating Leased Assets [Line Items]
Right-of-use assets	$ 499,287	$ 512,774	$ 434,200
Lease liabilities	329,130	331,334	$ 278,300
Corporate Office Leases [Member]
Operating Leased Assets [Line Items]
Right-of-use assets	39,203	41,596
Lease liabilities	40,470	43,105
Ground Leases [Member]
Operating Leased Assets [Line Items]
Right-of-use assets	402,500	413,196
Finance lease, right-of-use asset	57,584	57,982
Lease liabilities	265,310	264,990
Finance lease, liabilities	$ 23,350	$ 23,239

Leases - Summary of Quantitativ

Leases - Summary of Quantitative Disclosures for Lessees (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lease cost:
Interest on lease liabilities (capitalized)	$ 1,029	$ 225
Total lease cost	31,489	31,549
Cash paid for amounts included in the measurement of lease liabilities:
Investing cash flows from finance leases (capitalized)	$ 567	34,922
ROU assets obtained in exchange for new finance lease liabilities		$ 23,201
Weighted-average remaining lease term – finance leases	18 years 8 months 12 days	19 years 8 months 12 days
Weighted-average discount rate – finance leases	3.00%	3.00%
Corporate Office Leases [Member]
Lease cost:
Operating lease cost	$ 3,747	$ 3,937
Variable lease cost	1,307	1,489
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from Operating leases	$ 5,296	5,494
ROU assets obtained in exchange for new operating lease liabilities		$ 44,298
Weighted-average remaining lease term – operating leases	17 years 4 months 24 days	18 years 1 month 6 days
Weighted-average discount rate – operating leases	3.20%	3.20%
Ground Leases [Member]
Lease cost:
Operating lease cost	$ 22,102	$ 22,198
Variable lease cost	3,304	3,700
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from Operating leases	$ 16,552	16,837
ROU assets obtained in exchange for new operating lease liabilities		$ 422,018
Weighted-average remaining lease term – operating leases	55 years 3 months 18 days	56 years 2 months 12 days
Weighted-average discount rate – operating leases	5.00%	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, 2020USD ($)
Leases [Abstract]
2021	$ (578)
2022	(590)
2023	(601)
2024	(614)
2025	(626)
Thereafter	(33,224)
Total	(36,233)
2021	(17,160)
2022	(16,906)
2023	(16,997)
2024	(17,329)
2025	(17,375)
Thereafter	(954,108)
Total	(1,039,875)
2021	59,430
2022	54,656
2023	51,091
2024	45,166
2025	38,847
Thereafter	126,732
Total	$ 375,922

Leases - Summary of Reconciliat

Leases - Summary of Reconciliation of Lease Liabilities (Details) $ in Thousands	Dec. 31, 2020USD ($)
Leases [Abstract]
Total minimum rent payments	$ 1,076,108
Less: Lease discount	746,978
Lease liabilities	$ 329,130

Debt - Mortgage Notes Payable -

Debt - Mortgage Notes Payable - Summary of Mortgage Notes Payable Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	$ 1,941,610	$ 2,385,470
Proceeds	519,204	295,771	$ 96,935
Lump sum payoffs	(160,522)	(743,021)	(1,347,939)
Scheduled principal repayments	(7,759)	(6,808)
Amortization of premiums/ discounts	2,234	8,618	20,144
Amortization of deferred financing costs, net	(877)	1,580
Mortgage notes payable, net ending balance	2,293,890	1,941,610	2,385,470
Fixed Rate Debt [Member] | Secured – Conventional [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	1,574,699	1,885,407
Proceeds	495,000	288,120
Lump sum payoffs	(160,522)	(584,536)
Scheduled principal repayments	(7,759)	(6,308)
Amortization of premiums/ discounts	988	(7,999)
Amortization of deferred financing costs, net	(1,315)	15
Mortgage notes payable, net ending balance	1,901,091	1,574,699	1,885,407
Floating Rate Debt [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	366,911	500,063
Proceeds	24,204	7,651
Lump sum payoffs		(158,485)
Scheduled principal repayments		(500)
Amortization of premiums/ discounts	1,246	16,617
Amortization of deferred financing costs, net	438	1,565
Mortgage notes payable, net ending balance	392,799	366,911	500,063
Floating Rate Debt [Member] | Secured – Conventional [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	7,050	6,357
Proceeds	24,204	7,651
Lump sum payoffs		(5,920)
Scheduled principal repayments		(500)
Amortization of deferred financing costs, net	240	(538)
Mortgage notes payable, net ending balance	31,494	7,050	6,357
Floating Rate Debt [Member] | Secured – Tax Exempt [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	359,861	493,706
Lump sum payoffs		(152,565)
Amortization of premiums/ discounts	1,246	16,617
Amortization of deferred financing costs, net	198	2,103
Mortgage notes payable, net ending balance	$ 361,305	$ 359,861	$ 493,706

Debt - Mortgage Notes Payable_2

Debt - Mortgage Notes Payable - Summary of Mortgage Notes Payable Activity (Parenthetical) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
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
Fannie Mae Loan Pool [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.60%	3.94%
Debt instrument, maturity date	May 1, 2030	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, 2020	Dec. 31, 2019
Extinguishment Of Debt [Line Items]
Prepayment premiums/penalties	$ 327	$ 3,381
Write-offs of unamortized deferred financing costs	63	2,273
Write-offs of unamortized (premiums)/discounts/OCI	(190)	6,153
Total	$ 200	$ 11,807

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, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.33%	3.84%
Maturity Date Ranges, Start	2021	2020
Maturity Date Ranges, End	2061	2061
Minimum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	0.06%	0.10%
Maximum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	4.71%	5.29%

Debt - Mortgage Notes Payable_5

Debt - Mortgage Notes Payable - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Mortgage notes payable	$ 2,293,890	$ 1,941,610	$ 2,385,470
Historical cost, net of accumulated depreciation, of encumbered properties	2,900,000	2,700,000
Credit Enhanced Debt [Member]
Debt Instrument [Line Items]
Mortgage notes payable	$ 281,700	$ 281,700

Debt - Notes - Summary of Notes

Debt - Notes - Summary of Notes Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Notes, net beginning balance	$ 6,077,513	$ 5,933,286
Proceeds		1,194,468	$ 896,294
Lump sum payoffs	(750,000)	(1,050,000)
Realized/unrealized (gain) loss on derivative instruments		2,277	(680)
Amortization of premiums/ discounts	2,997	3,162	2,637
Amortization of deferred financing costs, net		(5,680)
Notes, net ending balance	5,335,536	6,077,513	5,933,286
Fixed Rate Debt [Member] | Unsecured – Public [Member]
Debt Instrument [Line Items]
Notes, net beginning balance	6,077,513	5,485,884
Proceeds		1,194,468
Lump sum payoffs	(750,000)	(600,000)
Amortization of premiums/ discounts	2,997	3,117
Amortization of deferred financing costs, net	5,026	(5,956)
Notes, net ending balance	$ 5,335,536	6,077,513	5,485,884
Floating Rate Debt [Member] | Unsecured – Public [Member]
Debt Instrument [Line Items]
Notes, net beginning balance		447,402
Lump sum payoffs		(450,000)
Realized/unrealized (gain) loss on derivative instruments		2,277
Amortization of premiums/ discounts		45
Amortization of deferred financing costs, net		$ 276
Notes, net ending balance			$ 447,402

Debt - Notes - Summary of Not_2

Debt - Notes - Summary of Notes Activity (Parenthetical) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
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

Debt - Notes - Summary of Debt

Debt - Notes - Summary of Debt Extinguishment Costs on Notes Recorded as Additional Interest Expense (Details) - Notes [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Extinguishment Of Debt [Line Items]
Prepayment premiums/penalties	$ 25,823	$ 10,266
Write-offs of unamortized deferred financing costs	571	287
Write-offs of unamortized (premiums)/discounts/OCI	12,698	1,043
Total	$ 39,092	$ 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, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.03%	4.21%
Maturity Date Ranges, Start	2023	2021
Maturity Date Ranges, End	2047	2047
Minimum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	2.50%	2.50%
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, 2020
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, 2020	Dec. 31, 2019	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	$ 415,000,000	$ 1,000,000,000	$ 1,000,000,000	$ 500,000,000
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Weighted average interest rates	1.72%	2.42%
Weighted average amount outstanding	$ 276,600,000	$ 434,400,000
Commercial paper weighted average days outstanding	45 days	40 days
Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Unsecured revolving credit facility	$ 2,500,000,000	$ 2,500,000,000			$ 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	$ 415,000,000	$ 1,000,000,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Weighted average interest rates	1.47%	3.12%

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, 2020	Dec. 31, 2019	Nov. 04, 2019	Nov. 03, 2019	Nov. 01, 2019	Oct. 31, 2019
Line of Credit Facility [Line Items]
Commercial paper balance outstanding	$ (415,000,000)	$ (1,000,000,000)	$ (1,000,000,000)	$ (500,000,000)
Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Unsecured revolving credit facility commitment	2,500,000,000	2,500,000,000			$ 2,500,000,000	$ 2,000,000,000
Commercial paper balance outstanding	(415,000,000)	(1,000,000,000)
Unsecured revolving credit facility balance outstanding		(20,000,000)
Other restricted amounts	(100,949,000)	(100,929,000)
Unsecured revolving credit facility availability	$ 1,984,051,000	$ 1,379,071,000

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, 2020USD ($)
Debt Disclosure [Abstract]
2021	$ 450,665
2022	296,040
2023	1,329,088
2024	6,100
2025	458,200
Thereafter	5,586,810
Subtotal	8,126,903
Deferred Financing Costs and Unamortized (Discount)	(82,647)
Total	$ 8,044,256

Debt - Summary of Aggregate P_2

Debt - Summary of Aggregate Payments of Principal on All Debt (Parenthetical) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Nov. 04, 2019	Nov. 03, 2019
Debt Disclosure [Abstract]
Commercial paper balance outstanding	$ 415	$ 1,000	$ 1,000	$ 500

Derivative and Other Fair Val_3

Derivative and Other Fair Value Instruments - Summary of Valuations for Each Type of Fair Value Measurement (Details)	12 Months Ended
	Dec. 31, 2020
Employee Holdings Within The Supplemental Executive Retirement Plan
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Type	Employee holdings (other than Common Shares) within the supplemental executive retirement plan (the “SERP”)
Valuation Inputs	Quoted market prices for identical assets. These holdings are included in other assets and other liabilities on the consolidated balance sheets.
Redeemable Noncontrolling Interests Operating Partnership Redeemable Limited Partners
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Type	Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners
Valuation Inputs	Quoted market price of Common Shares.
Mortgage Notes Payable And Private Unsecured Debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Type	Mortgage notes payable and private unsecured debt (including its commercial paper and line of credit, if applicable)
Valuation Inputs	Indicative rates provided by lenders of similar loans.
Public Unsecured Notes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Type	Public unsecured notes
Valuation Inputs	Quoted market prices for each underlying issuance.

Derivative and Other Fair Val_4

Derivative and Other Fair Value Instruments - Summary of Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	$ 8,044,256	$ 9,036,956
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	8,999,875	9,607,999
Mortgage Notes Payable, Net [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	2,293,890	1,941,610
Mortgage Notes Payable, Net [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	2,313,263	1,930,710
Unsecured Debt [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	5,750,366	7,095,346
Unsecured Debt [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	$ 6,686,612	$ 7,677,289

Derivative and Other Fair Val_5

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, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Fair Value Of SERP Investments	$ 160,293	$ 151,889
Other Liabilities, Fair Value Disclosure	160,293	151,889
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	338,951	463,400	$ 379,106	$ 366,955
Fair Value, Inputs, Level 1 [Member]
Derivatives, Fair Value [Line Items]
Fair Value Of SERP Investments	160,293	151,889
Other Liabilities, Fair Value Disclosure	160,293	151,889
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	0	0
Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair Value Of SERP Investments	0	0
Other Liabilities, Fair Value Disclosure	0	0
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	338,951	463,400
Fair Value, Inputs, Level 3 [Member]
Derivatives, Fair Value [Line Items]
Fair Value Of SERP Investments	0	0
Other Liabilities, Fair Value Disclosure	0	0
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	$ 0	$ 0

Derivative and Other Fair Val_6

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative	$ 0	$ 2,277	$ (680)
Amount of Gain/(Loss) Recognized in Income on Hedged Item	0	(2,277)	680
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative	0	2,277	(680)
Amount of Gain/(Loss) Recognized in Income on Hedged Item	$ 0	$ (2,277)	$ 680

Derivative and Other Fair Val_7

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion - Amount of Gain/(Loss) Recognized in OCI on Derivative	$ (1,190)	$ (33,765)	$ 5,124
Effective Portion - Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income	(35,087)	(21,188)	(18,452)
Ineffective Portion - Amount of Gain/ (Loss) Reclassified from Accumulated OCI into Income			0
Forward Starting Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion - Amount of Gain/(Loss) Recognized in OCI on Derivative	(1,190)	(33,765)	5,124
Effective Portion - Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income	$ (35,087)	$ (21,188)	(18,452)
Ineffective Portion - Amount of Gain/ (Loss) Reclassified from Accumulated OCI into Income			$ 0

Derivative and Other Fair Val_8

Derivative and Other Fair Value Instruments - Additional Information (Details)	1 Months Ended					12 Months Ended
	Apr. 30, 2020USD ($)DerivativeInstrument	Jul. 31, 2019USD ($)DerivativeInstrument	Jun. 30, 2019USD ($)DerivativeInstrument	Nov. 30, 2018USD ($)DerivativeInstrument	Feb. 28, 2018USD ($)DerivativeInstrument	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Derivative [Line Items]
Unrealized gain (loss) on interest rate cash flow hedges, pretax, accumulated other comprehensive income (loss)						$ 43,700,000	$ 77,600,000
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net						10,200,000
Number of interest rate swaps matured | DerivativeInstrument		6
Repayments of unsecured debt						$ 750,000,000	$ 1,050,000,000
Forward Starting Swaps [Member]
Derivative [Line Items]
Payments for settlement of derivative instruments	$ 1,200,000
Forward starting swaps settled | DerivativeInstrument	2		10	6	2
Debt instrument face amount			$ 600,000,000	$ 400,000,000	$ 500,000,000
Increase (decrease) in charges hedge termination activities	$ 1,200,000		41,600,000	(16,500,000)	(1,600,000)
Mortgage notes period	5 years
Proceeds from settlement of derivative instruments			41,800,000	16,400,000	$ 1,600,000
Interest expense			$ 200,000	$ 120,000
Debt instrument, term			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%
Mortgages [Member] | Forward Starting Swaps [Member]
Derivative [Line Items]
Debt instrument face amount	$ 495,000,000
Secured conventional mortgage notes period	10 years

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 962,501	$ 1,009,708	$ 685,192
Allocation to Noncontrolling Interests – Operating Partnership	(34,010)	(36,034)	(24,939)
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	(14,855)	(3,297)	(2,718)
Preferred distributions	(3,090)	(3,090)	(3,090)
Net income available to Common Shares	910,546	967,287	654,445
Numerator for net income per share – diluted	$ 944,556	$ 1,003,321	$ 679,384
Weighted average Common Shares outstanding	371,791	370,461	368,052
OP Units	13,003	12,907	12,869
Dilutive Securities Options	1,080	2,965	2,774
Denominator for net income per share – diluted	385,874	386,333	383,695
Net income per share – basic	$ 2.45	$ 2.61	$ 1.78
Net income per share – diluted	$ 2.45	$ 2.60	$ 1.77

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Net income	$ 962,501	$ 1,009,708	$ 685,192
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	$ (14,855)	$ (3,297)	$ (2,718)
Dilutive Securities Options	1,080	2,965	2,774
Denominator for net income per share – diluted	385,874	386,333	383,695
Net income per Unit – basic	$ 2.45	$ 2.61	$ 1.78
Net income per Unit – diluted	$ 2.45	$ 2.60	$ 1.77
ERPOP [Member]
Net income	$ 962,501	$ 1,009,708	$ 685,192
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	(14,855)	(3,297)	(2,718)
Allocation to Preference Units	(3,090)	(3,090)	(3,090)
Numerator for net income per Unit – basic and diluted	$ 944,556	$ 1,003,321	$ 679,384
Denominator for net income per Unit – basic	384,794	383,368	380,921
Dilutive Securities Options	1,080	2,965	2,774
Denominator for net income per share – diluted	385,874	386,333	383,695
Net income per Unit – basic	$ 2.45	$ 2.61	$ 1.78
Net income per Unit – diluted	$ 2.45	$ 2.60	$ 1.77

Share Incentive Plans - Additio

Share Incentive Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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	10,512,390
Individual potential target award minimum	0.00%
Individual potential target award maximum	200.00%
Percent of award target performance metric	50.00%
Percentage of distribution payments	10.00%
Compensation information
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized	$ 10.5
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition	1 year 3 months 7 days
Share-based compensation arrangement by share-based payment award, options, exercisable, number		4,750,481	5,328,020
Share-based compensation arrangement by share-based payment award, options, exercisable, weighted average exercise price		$ 54.13	$ 49.57
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, 2020
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 Valuation Method of Share Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	15.20%	16.30%	14.80%
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	3.04%	3.10%	3.09%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.32%	2.43%	2.52%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 7.23	$ 8.06	$ 6.15

Share Incentive Plans - Summa_3

Share Incentive Plans - Summary of Valuation Method of Share Options (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract]
Historical period of estimated volatility	5 years

Share Incentive Plans - Summa_4

Share Incentive Plans - Summary of Weighted Average Fair Value for Each Restricted Share/Unit (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average fair value per restricted share	$ 77.44	$ 73.96	$ 62.25
LTI Awards [Member] | Restricted Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average fair value per restricted share	75.89	65.36	63.86
LTI Awards [Member] | Restricted Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average fair value per restricted share	$ 72.69	$ 63.12	$ 62.20

Share Incentive Plans - Summa_5

Share Incentive Plans - Summary of Terms of Each Retirement Eligibility Category (Details)	12 Months Ended
	Dec. 31, 2020
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, 2020	Dec. 31, 2019	Dec. 31, 2018
Compensation information
Compensation Expense	$ 23,174	$ 24,449	$ 27,132
Compensation Capitalized	1,527	1,450	1,218
Restricted Units In-Lieu of Bonus	1,743	3,266	4,418
Compensation Equity	26,444	29,165	32,768
Dividends Incurred	3,027	1,804	1,717
Restricted Shares [Member]
Compensation information
Compensation Expense	10,053	11,522	7,406
Compensation Capitalized	1,172	916	852
Restricted Units In-Lieu of Bonus	0	0	0
Compensation Equity	11,225	12,438	8,258
Dividends Incurred	1,172	979	754
Restricted Stock Units (RSUs) [Member]
Compensation information
Compensation Expense	10,103	9,905	12,310
Compensation Capitalized	80	240	36
Restricted Units In-Lieu of Bonus	1,743	3,265	1,663
Compensation Equity	11,926	13,410	14,009
Dividends Incurred	1,855	825	963
Options [Member]
Compensation information
Compensation Expense	2,156	2,420	6,683
Compensation Capitalized	193	254	296
Restricted Units In-Lieu of Bonus	0	1	2,755
Compensation Equity	2,349	2,675	9,734
Dividends Incurred	0	0	0
Employee Share Purchase Plan Discount [Member]
Compensation information
Compensation Expense	862	602	733
Compensation Capitalized	82	40	34
Restricted Units In-Lieu of Bonus	0	0	0
Compensation Equity	944	642	767
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, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Common Shares Subject to Options, Awards exercised/vested	(239,695)	(1,745,050)	(1,056,388)
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	5,567,544	7,112,235	6,483,832
Common Shares Subject to Options, Awards granted	317,731	234,147	1,730,942
Common Shares Subject to Options, Awards exercised/vested	(239,695)	(1,745,050)	(1,056,388)
Common Shares Subject to Options, Awards forfeited	(1,344)	(30,489)	(38,133)
Common Shares Subject to Options, Awards expired	(1,484)	(3,299)	(8,018)
Common Shares Subject to Options, Ending Balance	5,642,752	5,567,544	7,112,235
Weighted Average Exercise Price per Option, Beginning Balance	$ 55.52	$ 52.35	$ 46.46
Weighted Average Exercise Price per Option, Awards granted	76.26	72.10	60.40
Weighted Average Exercise Price per Option, Awards exercised/vested	50.31	44.72	29.05
Weighted Average Exercise Price per Option, Awards forfeited	72.69	61.92	60.74
Weighted Average Exercise Price per Option, Awards expired	47.18	40.39	59.70
Weighted Average Exercise Price per Option, Ending Balance	$ 56.91	$ 55.52	$ 52.35
Restricted Shares [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Restricted Shares, Beginning Balance	306,706	299,425	369,741
Restricted Shares, Awards granted	179,911	163,799	129,303
Restricted Shares, Awards exercised/vested	(131,792)	(151,321)	(194,116)
Restricted Shares, Awards forfeited	(1,191)	(5,197)	(5,503)
Restricted Shares, Awards Expired	0	0	0
Restricted Shares, Ending Balance	353,634	306,706	299,425
Weighted Average Fair Value per Restricted Share, Beginning Balance	$ 66.15	$ 66.52	$ 73.67
Weighted average fair value per restricted share	77.44	73.96	62.25
Weighted Average Fair Value per Restricted Share, Awards exercised/vested	66.32	75.41	77.32
Weighted Average Fair Value per Restricted Share, Awards forfeited	73.45	65.35	65.77
Weighted Average Fair Value per Restricted Share, Awards Expired	0	0	0
Weighted Average Fair Value per Restricted Share, Ending Balance	$ 71.81	$ 66.15	$ 66.52
Restricted Units [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Restricted Units, Beginning Balance	858,284	1,139,848	901,260
Restricted Units, Awards Granted	249,263	141,772	267,074
Restricted Units, Awards exercised/vested	(227,747)	(422,784)	(28,486)
Restricted Units, Awards forfeited	0	(552)	0
Restricted Units, Awards Expired	0	0	0
Restricted Units, Ending Balance	879,800	858,284	1,139,848
Weighted Average Fair Value per Restricted Unit, Beginning Balance	$ 64.95	$ 71.07	$ 77.61
Weighted Average Fair Value per Restricted Unit, Awards granted	72	67.22	61.60
Weighted Average Fair Value per Restricted Unit, Awards exercised/vested	68.47	70.77	55.50
Weighted Average Fair Value per Restricted Unit, Awards forfeited	0	69.43	0
Weighted Average Fair Value per Restricted Unit, Awards Expired	0	0	0
Weighted Average Fair Value per Restricted Unit, Ending Balance	$ 66.78	$ 64.95	$ 71.07

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Weighted average grant date fair value for Options	$ 7.23	$ 8.06	$ 6.15
Employee Stock Option [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Weighted average grant date fair value for Options	$ 6.74	$ 8.05	$ 6.17
Intrinsic value of options exercised	$ 7.6	$ 58.1	$ 42.9
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	10.6	11.1	11.5
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	$ 18.7	$ 29.1	$ 1.8

Share Incentive Plans - Informa

Share Incentive Plans - Information Regarding Options Outstanding and Exercisable (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)$ / sharesshares
Share Based Compensation [Abstract]
Options Outstanding, Options | shares	5,642,752
Options Exercisable, Options | shares	4,985,668
Options, Vested and expected to vest | shares	648,552
Options Outstanding, Weighted Average Remaining Contractual Life in Years	4 years 7 months 20 days
Options Exercisable, Weighted Average Remaining Contractual Life in Years	4 years 1 month 28 days
Options Vested and expected to vest, Weighted Average Remaining Contractual Life in Years	8 years 3 months 25 days
Options Outstanding, Weighted Average Exercise Price | $ / shares	$ 56.91
Options Exercisable, Weighted Average Exercise Price | $ / shares	55.12
Vested and expected to vest, Weighted Average Exercise Price | $ / shares	$ 70.40
Options Outstanding, Aggregate Intrinsic Value | $	$ 26,881
Options Exercisable, Aggregate Intrinsic Value | $	26,804
Vested and expected to vest, Aggregate Intrinsic Value | $	$ 77

Share Incentive Plans - Infor_2

Share Incentive Plans - Information Regarding Options Outstanding and Exercisable (Parenthetical) (Details)	Dec. 31, 2020$ / shares
Share Based Compensation [Abstract]
Market value of common shares	$ 59.28

Employee Plans - Additional Inf

Employee Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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	2,624,136
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	$ 5,200,000	$ 5,000,000	$ 4,900,000
Highly Compensated Employees [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum eligible compensation percentage for the defined contribution plan (the 401(k) Plan)	3.00%

Employee Plans - Summary of Inf

Employee Plans - Summary of Information Regarding the Common Shares Issued Under the ESPP (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee Service Share Based Compensation Aggregate Disclosures [Abstract]
Shares issued	90,196	48,131	75,414
Issuance price ranges, Minimum	$ 46.23	$ 59.56	$ 47.80
Issuance price ranges, Maximum	$ 63.84	$ 72.91	$ 57.09
Issuance proceeds	$ 4,508	$ 3,116	$ 3,879

Distribution Reinvestment Plan

Distribution Reinvestment Plan - Additional Information (Details) - shares	Dec. 31, 2020	Sep. 30, 2014
Distribution Reinvestment And Share Purchase Plan [Abstract]
Common shares registered with distribution reinvestment and share purchase Plan (2014 DRIP)		4,790,000
Number of shares available for issuance	4,650,334

Transactions with Related Par_2

Transactions with Related Parties - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transactions [Abstract]
Lease expiration date	Nov. 30, 2032
Lease extension options	two five-year
Amount incurred for leased office space	$ 2.1	$ 2.6	$ 2.5

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)PropertyApartmentUnitAgreement	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Commitments And Contingencies [Abstract]
Projects in various stages of development	2
Partially owned projects in various stages of development	1
Units in various stages of development | ApartmentUnit	824
Consolidated project under development commitment fund | $	$ 191.7
Various stages of development with estimated completion dates ranging through September 30, 2021	Sep. 30, 2021
Number of projects completed and stabilized	2
Number of joint venture agreements | Agreement	2
Compensation expense, recognized | $	$ 0.5	$ 0.4	$ 0.3

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Contractual Obligations (Details) $ in Thousands	Dec. 31, 2020USD ($)
Other Long-Term Liabilities:
Deferred Compensation Due, Year 1	$ (769)
Deferred Compensation Due, Year 2	(1,130)
Deferred Compensation Due, Year 3	(1,005)
Deferred Compensation Due, Year 4	(723)
Deferred Compensation Due, Year 5	(723)
Deferred Compensation Due, Thereafter	(3,976)
Deferred Compensation Due, Total	$ (8,326)

Reportable Segments - Additiona

Reportable Segments - Additional Information (Details) - Customer	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Number of customer contributed 10% or more of total revenue	0	0	0
Non-residential Leases [Member] | Revenue [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	2.70%

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Rental income	$ 2,571,705	$ 2,700,691	$ 2,577,681
Property and maintenance expense	(440,998)	(446,845)	(429,335)
Real estate taxes and insurance expense	(381,562)	(366,139)	(357,814)
Operating income	1,317,990	1,356,160	1,114,617
Same Store, Non-same Store and Other
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Rental income	2,571,705	2,700,691	2,577,681
Property and maintenance expense	(440,998)	(446,845)	(429,335)
Real estate taxes and insurance expense	(381,562)	(366,139)	(357,814)
Total operating expenses	(822,560)	(812,984)	(787,149)
Operating income	$ 1,749,145	$ 1,887,707	$ 1,790,532

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Rental income	$ 2,571,705	$ 2,700,691	$ 2,577,681
Operating income	1,317,990	1,356,160	1,114,617
Total assets	20,286,891	21,172,769
Same Store
Segment Reporting Information [Line Items]
Rental income	2,419,018	2,519,235	2,377,066
Operating expenses	773,479	757,502	708,616
Operating income	1,645,539	1,761,733	1,668,450
Total assets	17,698,696	18,241,515
Capital Expenditures	132,281	171,135
Non-same store/other
Segment Reporting Information [Line Items]
Rental income	152,687	181,456	200,615
Operating expenses	49,081	55,482	78,533
Operating income	103,606	125,974	122,082
Total assets	2,588,195	2,931,254
Capital Expenditures	3,698	7,288
Same Store, Non-same Store and Other
Segment Reporting Information [Line Items]
Rental income	2,571,705	2,700,691	2,577,681
Operating expenses	822,560	812,984	787,149
Operating income	1,749,145	1,887,707	1,790,532
Total assets	20,286,891	21,172,769
Capital Expenditures	135,979	178,423
Other markets | Same Store
Segment Reporting Information [Line Items]
Rental income	17,605	18,215	1,940
Operating expenses	4,858	4,713	658
Operating income	12,747	13,502	1,282
Los Angeles | Same Store
Segment Reporting Information [Line Items]
Rental income	468,450	485,084	451,592
Operating expenses	145,342	144,314	129,455
Operating income	323,108	340,770	322,137
Total assets	3,007,621	3,110,659
Capital Expenditures	22,817	32,611
Subtotal - Southern California | Same Store
Segment Reporting Information [Line Items]
Rental income	648,423	663,869	644,761
Operating expenses	188,063	186,562	177,947
Operating income	460,360	477,307	466,814
Total assets	3,639,057	3,767,255
Capital Expenditures	33,507	45,834
Orange County | Same Store
Segment Reporting Information [Line Items]
Rental income	105,236	105,087	101,198
Operating expenses	24,545	24,359	24,468
Operating income	80,691	80,728	76,730
Total assets	389,007	404,545
Capital Expenditures	7,260	9,276
San Diego | Same Store
Segment Reporting Information [Line Items]
Rental income	74,737	73,698	91,971
Operating expenses	18,176	17,889	24,024
Operating income	56,561	55,809	67,947
Total assets	242,429	252,051
Capital Expenditures	3,430	3,947
Washington DC | Same Store
Segment Reporting Information [Line Items]
Rental income	389,533	394,171	403,761
Operating expenses	120,533	119,419	123,345
Operating income	269,000	274,752	280,416
Total assets	3,066,702	3,174,721
Capital Expenditures	23,626	22,409
New York | Same Store
Segment Reporting Information [Line Items]
Rental income	426,016	464,270	444,112
Operating expenses	198,228	191,514	178,055
Operating income	227,788	272,756	266,057
Total assets	3,950,286	4,004,078
Capital Expenditures	25,609	26,976
San Francisco | Same Store
Segment Reporting Information [Line Items]
Rental income	451,724	473,102	463,492
Operating expenses	119,183	115,702	112,331
Operating income	332,541	357,400	351,161
Total assets	3,233,901	3,345,882
Capital Expenditures	18,983	25,925
Boston | Same Store
Segment Reporting Information [Line Items]
Rental income	240,158	253,297	218,778
Operating expenses	71,611	70,875	60,409
Operating income	168,547	182,422	158,369
Total assets	1,758,665	1,822,373
Capital Expenditures	18,367	27,267
Seattle | Same Store
Segment Reporting Information [Line Items]
Rental income	245,559	252,311	200,222
Operating expenses	71,003	68,717	55,871
Operating income	174,556	183,594	144,351
Total assets	1,802,952	1,871,232
Capital Expenditures	11,372	22,023
Non-same store | Non-same store/other
Segment Reporting Information [Line Items]
Rental income	116,103	58,751	103,688
Operating expenses	35,952	17,702	36,874
Operating income	80,151	41,049	66,814
Total assets	1,664,892	1,681,367
Capital Expenditures	2,627	1,864
Other | Non-same store/other
Segment Reporting Information [Line Items]
Rental income	36,584	122,705	96,927
Operating expenses	13,129	37,780	41,659
Operating income	23,455	84,925	$ 55,268
Total assets	923,303	1,249,887
Capital Expenditures	1,071	5,424
Denver | Same Store
Segment Reporting Information [Line Items]
Total assets	247,133	255,974
Capital Expenditures	$ 817	$ 701

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Disclosure Of Entitys Reportable Segments [Abstract]
Units in same store properties	73,585	73,585	71,830

Schedule III - Real Estate an_2

Schedule III - Real Estate and Accumulated Depreciation-Overall Summary (Details)	Dec. 31, 2020USD ($)PropertyApartmentUnit	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Overall summary of real estate and accumulated depreciation
Investment in Real Estate, Gross	$ 27,203,325,000	$ 27,533,607,000	$ 26,511,022,000	$ 26,026,896,000
Accumulated Depreciation	$ (7,859,657,000)	$ (7,276,786,000)	$ (6,696,281,000)	$ (6,040,378,000)
Investment in Real Estate - Wholly Owned Unencumbered [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	246
Units | ApartmentUnit	64,363
Investment in Real Estate, Gross	$ 22,528,561,227
Accumulated Depreciation	(6,521,859,521)
Investment in Real Estate, Net	16,006,701,706
Encumbrances	$ 0
Investment in Real Estate - Wholly Owned Encumbered [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	42
Units | ApartmentUnit	10,127
Investment in Real Estate, Gross	$ 3,704,582,050
Accumulated Depreciation	(1,032,587,859)
Investment in Real Estate, Net	2,671,994,191
Encumbrances	$ 2,088,144,904
Wholly Owned Properties
Overall summary of real estate and accumulated depreciation
Properties | Property	288
Units | ApartmentUnit	74,490
Investment in Real Estate, Gross	$ 26,233,143,277
Accumulated Depreciation	(7,554,447,380)
Investment in Real Estate, Net	18,678,695,897
Encumbrances	$ 2,088,144,904
Investment in Real Estate - Partially Owned Unencumbered [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	14
Units | ApartmentUnit	2,699
Investment in Real Estate, Gross	$ 672,990,027
Accumulated Depreciation	(231,543,640)
Investment in Real Estate, Net	441,446,387
Encumbrances	$ 0
Investment in Real Estate - Partially Owned Encumbered [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	2
Units | ApartmentUnit	700
Investment in Real Estate, Gross	$ 297,191,796
Accumulated Depreciation	(73,666,183)
Investment in Real Estate, Net	223,525,613
Encumbrances	$ 205,744,819
NONCONTROLLING INTERESTS - PARTIALLY OWNED PROPERTIES
Overall summary of real estate and accumulated depreciation
Properties | Property	16
Units | ApartmentUnit	3,399
Investment in Real Estate, Gross	$ 970,181,823
Accumulated Depreciation	(305,209,823)
Investment in Real Estate, Net	664,972,000
Encumbrances	$ 205,744,819
Unencumbered Properties [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	260
Units | ApartmentUnit	67,062
Investment in Real Estate, Gross	$ 23,201,551,254
Accumulated Depreciation	(6,753,403,161)
Investment in Real Estate, Net	16,448,148,093
Encumbrances	$ 0
Encumbered Properties [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	44
Units | ApartmentUnit	10,827
Investment in Real Estate, Gross	$ 4,001,773,846
Accumulated Depreciation	(1,106,254,042)
Investment in Real Estate, Net	2,895,519,804
Encumbrances	$ 2,293,889,723
Total Consolidated Investment in Real Estate [Member]
Overall summary of real estate and accumulated depreciation
Properties | Property	304
Units | ApartmentUnit	77,889
Investment in Real Estate, Gross	$ 27,203,325,100
Accumulated Depreciation	(7,859,657,203)
Investment in Real Estate, Net	19,343,667,897
Encumbrances	$ 2,293,889,723

Schedule III - Real Estate an_3

Schedule III - Real Estate and Accumulated Depreciation-Encumbrances Reconciliation (Details)	Dec. 31, 2020USD ($)Property
Total Consolidated Investment in Real Estate [Member]
Overall summary of real estate and accumulated depreciation
Encumbrances	$ 2,293,889,723
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	$ 798,691,865
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	$ 798,691,865
Individual Property Encumbrances [Member]
Overall summary of real estate and accumulated depreciation
Encumbrances	$ 1,495,197,858

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in total real estate
Balance, beginning of year	$ 27,533,607	$ 26,511,022	$ 26,026,896
Acquisitions and development	298,847	1,704,320	855,254
Improvements	154,433	180,944	192,661
Dispositions and other	(783,562)	(862,679)	(563,789)
Balance, end of year	$ 27,203,325	$ 27,533,607	$ 26,511,022

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in accumulated depreciation
Balance, beginning of year	$ 7,276,786	$ 6,696,281	$ 6,040,378
Depreciation	820,832	831,083	785,725
Dispositions and other	(237,961)	(250,578)	(129,822)
Balance, end of year	$ 7,859,657	$ 7,276,786	$ 6,696,281

Schedule III - Real Estate an_6

Schedule III - Real Estate and Accumulated Depreciation (Details)	12 Months Ended
	Dec. 31, 2020USD ($)ApartmentUnit	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Real Estate And Accumulated Depreciation Abstract
Accumulated Depreciation	$ (7,859,657,000)	$ (7,276,786,000)	$ (6,696,281,000)	$ (6,040,378,000)
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	70,296,069
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	18,484
Gross Amount Carried at close of period 12/31/2020, Land	15,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	70,314,553
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	85,914,553
Accumulated Depreciation	(6,076,767)
Investment in Real Estate, Net	79,837,786
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	10,817,358
Gross Amount Carried at close of period 12/31/2020, Land	103,539,100
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	104,900,083
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	208,439,183
Accumulated Depreciation	(56,324,733)
Investment in Real Estate, Net	152,114,450
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	18,135,193
Gross Amount Carried at close of period 12/31/2020, Land	139,933,500
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	209,099,938
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	349,033,438
Accumulated Depreciation	(112,149,211)
Investment in Real Estate, Net	236,884,227
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	734,040
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	112,830,995
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	112,830,995
Accumulated Depreciation	(25,078,672)
Investment in Real Estate, Net	87,752,323
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	2,476,612
Gross Amount Carried at close of period 12/31/2020, Land	22,037,831
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	56,438,781
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	78,476,612
Accumulated Depreciation	(20,147,633)
Investment in Real Estate, Net	58,328,979
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	5,346,485
Gross Amount Carried at close of period 12/31/2020, Land	32,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	98,021,713
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	130,421,713
Accumulated Depreciation	(30,697,551)
Investment in Real Estate, Net	99,724,162
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	16,593,445
Gross Amount Carried at close of period 12/31/2020, Land	144,968,250
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	154,940,126
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	299,908,376
Accumulated Depreciation	(83,930,689)
Investment in Real Estate, Net	215,977,687
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	3,222,293
Gross Amount Carried at close of period 12/31/2020, Land	9,213,512
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	39,781,482
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	48,994,994
Accumulated Depreciation	(21,574,097)
Investment in Real Estate, Net	27,420,897
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	5,636,363
Gross Amount Carried at close of period 12/31/2020, Land	9,780,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	95,304,528
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	105,084,528
Accumulated Depreciation	(41,418,326)
Investment in Real Estate, Net	63,666,202
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	16,685,633
Gross Amount Carried at close of period 12/31/2020, Land	54,638,298
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	57,047,335
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	111,685,633
Accumulated Depreciation	(31,601,970)
Investment in Real Estate, Net	80,083,663
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	8,912,514
Gross Amount Carried at close of period 12/31/2020, Land	31,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	117,918,248
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	149,318,248
Accumulated Depreciation	(37,308,243)
Investment in Real Estate, Net	112,010,005
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	2,798,189
Gross Amount Carried at close of period 12/31/2020, Land	11,321,198
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	52,472,364
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	63,793,562
Accumulated Depreciation	(17,223,799)
Investment in Real Estate, Net	46,569,763
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	5,288,939
Gross Amount Carried at close of period 12/31/2020, Land	21,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	84,013,602
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	105,913,602
Accumulated Depreciation	(26,463,239)
Investment in Real Estate, Net	79,450,363
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	4,779,484
Gross Amount Carried at close of period 12/31/2020, Land	30,006,593
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	118,793,269
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	148,799,862
Accumulated Depreciation	(61,688,804)
Investment in Real Estate, Net	87,111,058
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	1,442,998
Gross Amount Carried at close of period 12/31/2020, Land	14,450,070
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	117,267,928
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	131,717,998
Accumulated Depreciation	(27,148,732)
Investment in Real Estate, Net	104,569,266
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	248,608,702
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	366,576
Gross Amount Carried at close of period 12/31/2020, Land	42,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	248,975,278
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	290,975,278
Accumulated Depreciation	(43,051,114)
Investment in Real Estate, Net	247,924,164
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	$ 3,621,717
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	261,079
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2020, Land	3,621,717
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	261,079
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	3,882,796
Accumulated Depreciation	0
Investment in Real Estate, Net	3,882,796
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	8,427,901
Gross Amount Carried at close of period 12/31/2020, Land	56,300,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	149,619,481
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	205,919,481
Accumulated Depreciation	(49,200,506)
Investment in Real Estate, Net	156,718,975
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	5,317,169
Gross Amount Carried at close of period 12/31/2020, Land	28,150,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	143,917,169
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	172,067,169
Accumulated Depreciation	(58,212,092)
Investment in Real Estate, Net	113,855,077
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	61,418,689
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	59,540
Gross Amount Carried at close of period 12/31/2020, Land	11,941,407
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	61,478,229
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	73,419,636
Accumulated Depreciation	(8,480,027)
Investment in Real Estate, Net	64,939,609
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	18,548,300
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2020, Land	13,131,456
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,548,300
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	31,679,756
Accumulated Depreciation	0
Investment in Real Estate, Net	31,679,756
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 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	14,359,593
Gross Amount Carried at close of period 12/31/2020, Land	21,041,710
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	86,290,916
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	107,332,626
Accumulated Depreciation	(32,617,071)
Investment in Real Estate, Net	74,715,555
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	2,440,539
Gross Amount Carried at close of period 12/31/2020, Land	32,852,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	45,581,090
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	78,433,090
Accumulated Depreciation	(23,873,446)
Investment in Real Estate, Net	54,559,644
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	7,631,972
Gross Amount Carried at close of period 12/31/2020, Land	106,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	173,943,651
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	280,043,651
Accumulated Depreciation	(52,935,820)
Investment in Real Estate, Net	227,107,831
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	3,894,770
Gross Amount Carried at close of period 12/31/2020, Land	28,108,899
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	240,658,323
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	268,767,222
Accumulated Depreciation	(90,074,628)
Investment in Real Estate, Net	178,692,594
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	18,570,618
Gross Amount Carried at close of period 12/31/2020, Land	22,611,600
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	96,062,789
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	118,674,389
Accumulated Depreciation	(55,283,708)
Investment in Real Estate, Net	63,390,681
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	498,937
Gross Amount Carried at close of period 12/31/2020, Land	5,249,124
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	19,108,813
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	24,357,937
Accumulated Depreciation	(7,020,181)
Investment in Real Estate, Net	17,337,756
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	8,837,952
Gross Amount Carried at close of period 12/31/2020, Land	27,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	177,830,392
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	205,730,392
Accumulated Depreciation	(54,327,929)
Investment in Real Estate, Net	151,402,463
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	5,748,406
Gross Amount Carried at close of period 12/31/2020, Land	65,352,706
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	71,495,700
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	136,848,406
Accumulated Depreciation	(33,061,181)
Investment in Real Estate, Net	103,787,225
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	3,442,015
Gross Amount Carried at close of period 12/31/2020, Land	7,786,800
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	35,029,340
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	42,816,140
Accumulated Depreciation	(12,829,331)
Investment in Real Estate, Net	29,986,809
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	282,133,994
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	132,534
Gross Amount Carried at close of period 12/31/2020, Land	41,363,921
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	282,266,528
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	323,630,449
Accumulated Depreciation	(34,706,782)
Investment in Real Estate, Net	288,923,667
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	8,432,225
Gross Amount Carried at close of period 12/31/2020, Land	3,252,993
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	30,177,820
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	33,430,813
Accumulated Depreciation	(21,091,399)
Investment in Real Estate, Net	12,339,414
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	11,156,576
Gross Amount Carried at close of period 12/31/2020, Land	25,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	34,749,770
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	59,749,770
Accumulated Depreciation	(21,580,086)
Investment in Real Estate, Net	38,169,684
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	2,419,827
Gross Amount Carried at close of period 12/31/2020, Land	5,839,548
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	31,780,279
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	37,619,827
Accumulated Depreciation	(13,423,512)
Investment in Real Estate, Net	24,196,315
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	445,554
Gross Amount Carried at close of period 12/31/2020, Land	5,550,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	16,231,063
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	21,781,063
Accumulated Depreciation	(8,147,133)
Investment in Real Estate, Net	13,633,930
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	7,195,879
Gross Amount Carried at close of period 12/31/2020, Land	18,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	96,990,080
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	115,890,080
Accumulated Depreciation	(29,449,847)
Investment in Real Estate, Net	86,440,233
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	9,737,294
Gross Amount Carried at close of period 12/31/2020, Land	24,310,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	68,951,423
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	93,261,423
Accumulated Depreciation	(47,184,982)
Investment in Real Estate, Net	46,076,441
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	257,358,529
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2020, Land	10,424,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	257,358,529
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	267,782,529
Accumulated Depreciation	0
Investment in Real Estate, Net	267,782,529
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	150,235,105
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	612,403
Gross Amount Carried at close of period 12/31/2020, Land	43,783,485
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	150,847,508
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	194,630,993
Accumulated Depreciation	(26,754,900)
Investment in Real Estate, Net	167,876,093
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	96,524,128
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	243,844
Gross Amount Carried at close of period 12/31/2020, Land	11,049,027
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	96,767,972
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	107,816,999
Accumulated Depreciation	(15,320,884)
Investment in Real Estate, Net	92,496,115
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	11,966,964
Gross Amount Carried at close of period 12/31/2020, Land	9,057,300
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	30,450,606
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	39,507,906
Accumulated Depreciation	(19,584,926)
Investment in Real Estate, Net	19,922,980
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	3,279,238
Gross Amount Carried at close of period 12/31/2020, Land	26,650,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	66,129,238
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	92,779,238
Accumulated Depreciation	(27,016,180)
Investment in Real Estate, Net	65,763,058
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	1,298,143
Gross Amount Carried at close of period 12/31/2020, Land	8,000,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	37,372,743
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,373,143
Accumulated Depreciation	(14,173,055)
Investment in Real Estate, Net	31,200,088
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	7,368,364
Gross Amount Carried at close of period 12/31/2020, Land	12,300,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	68,834,631
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	81,134,631
Accumulated Depreciation	(23,980,609)
Investment in Real Estate, Net	57,154,022
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	515,334
Gross Amount Carried at close of period 12/31/2020, Land	32,401,680
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	47,650,766
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	80,052,446
Accumulated Depreciation	(10,219,483)
Investment in Real Estate, Net	69,832,963
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	2,509,228
Gross Amount Carried at close of period 12/31/2020, Land	7,995,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	20,514,228
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	28,509,228
Accumulated Depreciation	(8,409,710)
Investment in Real Estate, Net	20,099,518
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	240,588
Gross Amount Carried at close of period 12/31/2020, Land	14,745,774
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	90,744,419
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	105,490,193
Accumulated Depreciation	(11,084,271)
Investment in Real Estate, Net	94,405,922
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	153,567,641
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	479,066
Gross Amount Carried at close of period 12/31/2020, Land	32,855,115
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	154,046,707
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	186,901,822
Accumulated Depreciation	(30,930,604)
Investment in Real Estate, Net	155,971,218
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	4,043,249
Gross Amount Carried at close of period 12/31/2020, Land	7,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	31,480,488
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	39,080,488
Accumulated Depreciation	(17,947,925)
Investment in Real Estate, Net	21,132,563
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	2,437,470
Gross Amount Carried at close of period 12/31/2020, Land	114,351,405
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	168,086,065
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	282,437,470
Accumulated Depreciation	(56,957,402)
Investment in Real Estate, Net	225,480,068
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	11,255,581
Gross Amount Carried at close of period 12/31/2020, Land	31,682,754
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	132,351,367
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	164,034,121
Accumulated Depreciation	(68,433,638)
Investment in Real Estate, Net	95,600,483
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 12/31/2020, 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	(99,931)
Investment in Real Estate, Net	201,482
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	2,356,766
Gross Amount Carried at close of period 12/31/2020, Land	9,098,808
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	31,057,958
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	40,156,766
Accumulated Depreciation	(11,041,933)
Investment in Real Estate, Net	29,114,833
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	2,420,327
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	75,609,589
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	75,609,589
Accumulated Depreciation	(25,201,234)
Investment in Real Estate, Net	50,408,355
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	4,418,254
Gross Amount Carried at close of period 12/31/2020, Land	9,991,500
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,665,532
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	36,657,032
Accumulated Depreciation	(20,063,847)
Investment in Real Estate, Net	16,593,185
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	79,254,618
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	685,818
Gross Amount Carried at close of period 12/31/2020, Land	8,639,904
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	79,940,436
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	88,580,340
Accumulated Depreciation	(8,800,355)
Investment in Real Estate, Net	79,779,985
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	5,139,174
Gross Amount Carried at close of period 12/31/2020, Land	40,099,922
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	226,577,805
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	266,677,727
Accumulated Depreciation	(77,766,873)
Investment in Real Estate, Net	188,910,854
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	607,130
Gross Amount Carried at close of period 12/31/2020, Land	17,125,766
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	28,681,364
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,807,130
Accumulated Depreciation	(6,042,014)
Investment in Real Estate, Net	39,765,116
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	9,482,880
Gross Amount Carried at close of period 12/31/2020, Land	10,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	60,850,793
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	70,850,793
Accumulated Depreciation	(37,283,170)
Investment in Real Estate, Net	33,567,623
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	12,821,204
Gross Amount Carried at close of period 12/31/2020, Land	2,288,300
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	33,417,485
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,705,785
Accumulated Depreciation	(29,568,634)
Investment in Real Estate, Net	6,137,151
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	149,384,842
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	58,556
Gross Amount Carried at close of period 12/31/2020, Land	23,751,564
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	149,443,398
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	173,194,962
Accumulated Depreciation	(20,377,508)
Investment in Real Estate, Net	152,817,454
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	14,204,709
Gross Amount Carried at close of period 12/31/2020, Land	9,700,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	84,285,087
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	93,985,087
Accumulated Depreciation	(47,446,620)
Investment in Real Estate, Net	46,538,467
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	9,778,429
Gross Amount Carried at close of period 12/31/2020, Land	7,436,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	42,793,218
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	50,229,218
Accumulated Depreciation	(28,483,810)
Investment in Real Estate, Net	21,745,408
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 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	3,046,308
Gross Amount Carried at close of period 12/31/2020, Land	3,397,100
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	12,335,382
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	15,732,482
Accumulated Depreciation	(9,272,305)
Investment in Real Estate, Net	6,460,177
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	53,750,777
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	2,916
Gross Amount Carried at close of period 12/31/2020, Land	10,401,958
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	53,753,693
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	64,155,651
Accumulated Depreciation	(2,655,541)
Investment in Real Estate, Net	61,500,110
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	2,872,330
Gross Amount Carried at close of period 12/31/2020, Land	14,835,571
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	42,231,980
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	57,067,551
Accumulated Depreciation	(6,417,475)
Investment in Real Estate, Net	50,650,076
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	3,414,899
Gross Amount Carried at close of period 12/31/2020, Land	5,220,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	20,159,542
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	25,379,542
Accumulated Depreciation	(11,781,658)
Investment in Real Estate, Net	13,597,884
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	7,718,239
Gross Amount Carried at close of period 12/31/2020, Land	40,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	103,655,285
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	144,055,285
Accumulated Depreciation	(33,293,690)
Investment in Real Estate, Net	110,761,595
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	3,956,888
Gross Amount Carried at close of period 12/31/2020, Land	15,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	45,833,145
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	60,933,145
Accumulated Depreciation	(15,186,445)
Investment in Real Estate, Net	45,746,700
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	2,799,573
Gross Amount Carried at close of period 12/31/2020, Land	30,400,340
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	106,624,233
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	137,024,573
Accumulated Depreciation	(40,439,940)
Investment in Real Estate, Net	96,584,633
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	4,278,181
Gross Amount Carried at close of period 12/31/2020, Land	6,615,467
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	19,107,516
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	25,722,983
Accumulated Depreciation	(10,359,000)
Investment in Real Estate, Net	15,363,983
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	10,672,491
Gross Amount Carried at close of period 12/31/2020, Land	27,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	124,674,786
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	152,274,786
Accumulated Depreciation	(38,864,851)
Investment in Real Estate, Net	113,409,935
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	4,106,014
Gross Amount Carried at close of period 12/31/2020, Land	13,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	31,019,127
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	44,519,127
Accumulated Depreciation	(10,154,028)
Investment in Real Estate, Net	34,365,099
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	6,926,335
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	94,312,359
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	94,312,359
Accumulated Depreciation	(31,836,593)
Investment in Real Estate, Net	62,475,766
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	5,528,464
Gross Amount Carried at close of period 12/31/2020, Land	9,606,600
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,721,696
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	36,328,296
Accumulated Depreciation	(19,983,009)
Investment in Real Estate, Net	16,345,287
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	12,705,880
Gross Amount Carried at close of period 12/31/2020, Land	32,300,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	97,825,204
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	130,125,204
Accumulated Depreciation	(31,367,886)
Investment in Real Estate, Net	98,757,318
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	4,101,843
Gross Amount Carried at close of period 12/31/2020, Land	17,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	52,020,818
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	69,220,818
Accumulated Depreciation	(17,674,647)
Investment in Real Estate, Net	51,546,171
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	95,334,754
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	95,439
Gross Amount Carried at close of period 12/31/2020, Land	22,947,777
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	95,430,193
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	118,377,970
Accumulated Depreciation	(7,103,749)
Investment in Real Estate, Net	111,274,221
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	16,342,739
Gross Amount Carried at close of period 12/31/2020, Land	2,082,095
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	35,082,554
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	37,164,649
Accumulated Depreciation	(31,387,018)
Investment in Real Estate, Net	5,777,631
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	4,478,037
Gross Amount Carried at close of period 12/31/2020, Land	7,801,824
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	41,426,213
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	49,228,037
Accumulated Depreciation	(19,145,873)
Investment in Real Estate, Net	30,082,164
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	11,453,379
Gross Amount Carried at close of period 12/31/2020, Land	1,808,900
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,727,740
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	29,536,640
Accumulated Depreciation	(21,958,570)
Investment in Real Estate, Net	7,578,070
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	2,485,329
Gross Amount Carried at close of period 12/31/2020, Land	13,092,552
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	46,392,777
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	59,485,329
Accumulated Depreciation	(16,714,861)
Investment in Real Estate, Net	42,770,468
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	36,095,829
Gross Amount Carried at close of period 12/31/2020, Land	14,855,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	93,662,465
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	108,517,465
Accumulated Depreciation	(67,775,615)
Investment in Real Estate, Net	40,741,850
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	4,521,390
Gross Amount Carried at close of period 12/31/2020, Land	8,700,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	29,967,393
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	38,667,393
Accumulated Depreciation	(11,941,930)
Investment in Real Estate, Net	26,725,463
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Edge, The (fka 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	52,311,710
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	52,311,710
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	52,311,710
Accumulated Depreciation	0
Investment in Real Estate, Net	52,311,710
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	512,431
Gross Amount Carried at close of period 12/31/2020, Land	10,507,626
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	100,549,635
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	111,057,261
Accumulated Depreciation	(10,488,698)
Investment in Real Estate, Net	100,568,563
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	4,735,333
Gross Amount Carried at close of period 12/31/2020, Land	25,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	88,721,550
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	114,621,550
Accumulated Depreciation	(28,555,812)
Investment in Real Estate, Net	86,065,738
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	5,103,474
Gross Amount Carried at close of period 12/31/2020, Land	25,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	83,856,588
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	109,656,588
Accumulated Depreciation	(27,673,493)
Investment in Real Estate, Net	81,983,095
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	4,636,691
Gross Amount Carried at close of period 12/31/2020, Land	17,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	79,315,608
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	96,815,608
Accumulated Depreciation	(23,625,030)
Investment in Real Estate, Net	73,190,578
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	3,103,348
Gross Amount Carried at close of period 12/31/2020, Land	18,144,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	49,671,289
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	67,815,289
Accumulated Depreciation	(26,326,719)
Investment in Real Estate, Net	41,488,570
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	17,360,595
Gross Amount Carried at close of period 12/31/2020, Land	9,209,780
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	43,083,261
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	52,293,041
Accumulated Depreciation	(28,698,550)
Investment in Real Estate, Net	23,594,491
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	6,286,909
Gross Amount Carried at close of period 12/31/2020, Land	1,722,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	21,758,338
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	23,480,738
Accumulated Depreciation	(16,463,219)
Investment in Real Estate, Net	7,017,519
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	921,575
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	103,371,903
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	103,371,903
Accumulated Depreciation	(14,956,283)
Investment in Real Estate, Net	88,415,620
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	8,663,329
Gross Amount Carried at close of period 12/31/2020, Land	10,806,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	38,998,659
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	49,804,659
Accumulated Depreciation	(21,516,455)
Investment in Real Estate, Net	28,288,204
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	43,131,840
Gross Amount Carried at close of period 12/31/2020, Land	59,403,601
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	201,961,272
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	261,364,873
Accumulated Depreciation	(105,902,659)
Investment in Real Estate, Net	155,462,214
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	14,527,190
Gross Amount Carried at close of period 12/31/2020, Land	2,512,500
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	37,139,102
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	39,651,602
Accumulated Depreciation	(28,554,178)
Investment in Real Estate, Net	11,097,424
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	206,761,817
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	183,520
Gross Amount Carried at close of period 12/31/2020, Land	18,061,674
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	206,945,337
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	225,007,011
Accumulated Depreciation	(28,336,441)
Investment in Real Estate, Net	196,670,570
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	3,054,858
Gross Amount Carried at close of period 12/31/2020, Land	10,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	34,863,193
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,663,193
Accumulated Depreciation	(19,026,623)
Investment in Real Estate, Net	26,636,570
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	4,683,392
Gross Amount Carried at close of period 12/31/2020, Land	6,895,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	23,666,989
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	30,561,989
Accumulated Depreciation	(12,962,130)
Investment in Real Estate, Net	17,599,859
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	2,406,522
Gross Amount Carried at close of period 12/31/2020, Land	23,299,892
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	105,106,630
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	128,406,522
Accumulated Depreciation	(28,701,909)
Investment in Real Estate, Net	99,704,613
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	2,930,209
Gross Amount Carried at close of period 12/31/2020, Land	10,080,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	40,457,121
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	50,537,121
Accumulated Depreciation	(21,704,492)
Investment in Real Estate, Net	28,832,629
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	1,055,340
Gross Amount Carried at close of period 12/31/2020, Land	9,435,760
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	33,619,580
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	43,055,340
Accumulated Depreciation	(12,719,419)
Investment in Real Estate, Net	30,335,921
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Hillside ll [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	0
Initial Cost to Company, Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,892,874
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	1,892,874
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	1,892,874
Accumulated Depreciation	0
Investment in Real Estate, Net	1,892,874
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	3,305,385
Gross Amount Carried at close of period 12/31/2020, Land	23,420,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	73,283,084
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	96,703,084
Accumulated Depreciation	(41,028,871)
Investment in Real Estate, Net	55,674,213
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	7,258,907
Gross Amount Carried at close of period 12/31/2020, Land	5,350,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	48,372,981
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	53,722,981
Accumulated Depreciation	(28,021,673)
Investment in Real Estate, Net	25,701,308
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	89,336,651
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	38,505
Gross Amount Carried at close of period 12/31/2020, Land	18,775,028
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	89,375,156
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	108,150,184
Accumulated Depreciation	(7,124,237)
Investment in Real Estate, Net	101,025,947
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	1,964,134
Gross Amount Carried at close of period 12/31/2020, Land	2,732,800
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	15,852,416
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	18,585,216
Accumulated Depreciation	(9,126,262)
Investment in Real Estate, Net	9,458,954
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Jia (fka Chinatown Gateway) [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	78,218,492
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	917,303
Gross Amount Carried at close of period 12/31/2020, Land	14,791,831
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	79,135,795
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	93,927,626
Accumulated Depreciation	(25,013,639)
Investment in Real Estate, Net	68,913,987
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	56,584,312
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	256,046
Gross Amount Carried at close of period 12/31/2020, Land	11,726,305
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	56,840,358
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	68,566,663
Accumulated Depreciation	(12,195,811)
Investment in Real Estate, Net	56,370,852
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	778,776
Gross Amount Carried at close of period 12/31/2020, Land	15,521,552
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	65,632,224
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	81,153,776
Accumulated Depreciation	(15,146,860)
Investment in Real Estate, Net	66,006,916
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	31,270,480
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	7,218,616
Gross Amount Carried at close of period 12/31/2020, Land	13,642,420
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	38,489,096
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	52,131,516
Accumulated Depreciation	(21,078,780)
Investment in Real Estate, Net	31,052,736
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	15,622,471
Gross Amount Carried at close of period 12/31/2020, Land	27,246,045
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	53,363,521
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	80,609,566
Accumulated Depreciation	(35,393,712)
Investment in Real Estate, Net	45,215,854
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	71,933,303
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	65,928
Gross Amount Carried at close of period 12/31/2020, Land	13,142,946
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	71,999,231
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	85,142,177
Accumulated Depreciation	(4,558,633)
Investment in Real Estate, Net	80,583,544
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	462,150
Gross Amount Carried at close of period 12/31/2020, Land	21,817,512
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	159,240,748
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	181,058,260
Accumulated Depreciation	(15,000,565)
Investment in Real Estate, Net	166,057,695
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	7,808,575
Gross Amount Carried at close of period 12/31/2020, Land	5,977,504
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	34,557,686
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	40,535,190
Accumulated Depreciation	(21,422,606)
Investment in Real Estate, Net	19,112,584
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	4,517,251
Gross Amount Carried at close of period 12/31/2020, Land	16,382,822
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	88,334,329
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	104,717,151
Accumulated Depreciation	(34,837,074)
Investment in Real Estate, Net	69,880,077
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	15,212,279
Gross Amount Carried at close of period 12/31/2020, Land	5,928,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	48,807,541
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	54,735,941
Accumulated Depreciation	(39,401,499)
Investment in Real Estate, Net	15,334,442
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	7,530,710
Gross Amount Carried at close of period 12/31/2020, Land	18,696,674
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	85,976,367
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	104,673,041
Accumulated Depreciation	(27,734,674)
Investment in Real Estate, Net	76,938,367
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	44,438,432
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	(503)
Gross Amount Carried at close of period 12/31/2020, Land	4,603,326
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	44,437,929
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	49,041,255
Accumulated Depreciation	(2,109,619)
Investment in Real Estate, Net	46,931,636
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	5,401,688
Gross Amount Carried at close of period 12/31/2020, Land	73,170,045
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	59,364,198
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	132,534,243
Accumulated Depreciation	(28,246,752)
Investment in Real Estate, Net	104,287,491
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	89,681,781
Gross Amount Carried at close of period 12/31/2020, Land	38,264,917
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	221,857,696
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	260,122,613
Accumulated Depreciation	(163,889,861)
Investment in Real Estate, Net	96,232,752
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	961,691
Gross Amount Carried at close of period 12/31/2020, Land	9,679,635
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	65,555,896
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	75,235,531
Accumulated Depreciation	(7,494,654)
Investment in Real Estate, Net	67,740,877
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	1,480,793
Gross Amount Carried at close of period 12/31/2020, Land	22,346,513
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	62,981,951
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	85,328,464
Accumulated Depreciation	(20,145,143)
Investment in Real Estate, Net	65,183,321
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	9,623,804
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	178,466,246
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	178,466,246
Accumulated Depreciation	(59,646,703)
Investment in Real Estate, Net	118,819,543
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	7,039,392
Gross Amount Carried at close of period 12/31/2020, Land	60,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	96,350,874
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	157,250,874
Accumulated Depreciation	(31,786,197)
Investment in Real Estate, Net	125,464,677
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	172,242
Gross Amount Carried at close of period 12/31/2020, Land	23,004,387
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	51,321,103
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	74,325,490
Accumulated Depreciation	(6,791,552)
Investment in Real Estate, Net	67,533,938
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	2,627,968
Gross Amount Carried at close of period 12/31/2020, Land	13,740,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	43,385,269
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	57,125,269
Accumulated Depreciation	(22,558,686)
Investment in Real Estate, Net	34,566,583
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	4,435,789
Gross Amount Carried at close of period 12/31/2020, Land	8,125,216
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	31,814,573
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	39,939,789
Accumulated Depreciation	(10,534,953)
Investment in Real Estate, Net	29,404,836
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	18,006,191
Gross Amount Carried at close of period 12/31/2020, Land	12,858,693
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	75,174,694
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	88,033,387
Accumulated Depreciation	(43,305,918)
Investment in Real Estate, Net	44,727,469
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	1,669,692
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	61,250,590
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	61,250,590
Accumulated Depreciation	(25,749,117)
Investment in Real Estate, Net	35,501,473
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	1,630,338
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	1,630,338
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	1,630,338
Accumulated Depreciation	0
Investment in Real Estate, Net	1,630,338
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	2,595,464
Gross Amount Carried at close of period 12/31/2020, Land	8,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	55,124,910
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	63,624,910
Accumulated Depreciation	(27,902,570)
Investment in Real Estate, Net	35,722,340
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	11,586,703
Gross Amount Carried at close of period 12/31/2020, Land	75,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	114,292,104
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	190,092,104
Accumulated Depreciation	(38,926,014)
Investment in Real Estate, Net	151,166,090
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	136,635,650
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	161,352
Gross Amount Carried at close of period 12/31/2020, Land	52,509,906
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	136,797,002
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	189,306,908
Accumulated Depreciation	(13,325,292)
Investment in Real Estate, Net	175,981,616
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	7,943,309
Gross Amount Carried at close of period 12/31/2020, Land	4,000,159
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	102,233,899
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	106,234,058
Accumulated Depreciation	(57,060,669)
Investment in Real Estate, Net	49,173,389
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	7,159,183
Gross Amount Carried at close of period 12/31/2020, Land	9,360,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,937,736
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	37,297,736
Accumulated Depreciation	(17,739,770)
Investment in Real Estate, Net	19,557,966
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	15,619,323
Gross Amount Carried at close of period 12/31/2020, Land	38,607,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	93,091,540
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	131,698,540
Accumulated Depreciation	(43,765,024)
Investment in Real Estate, Net	87,933,516
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Notch [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Newcastle, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	158
Initial Cost to Company, Land	$ 5,463,324
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	43,490,989
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	5,378
Gross Amount Carried at close of period 12/31/2020, Land	5,463,324
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	43,496,367
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	48,959,691
Accumulated Depreciation	(1,267,355)
Investment in Real Estate, Net	47,692,336
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	11,540,745
Gross Amount Carried at close of period 12/31/2020, Land	3,390,700
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	42,058,019
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,448,719
Accumulated Depreciation	(35,268,612)
Investment in Real Estate, Net	10,180,107
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	8,845,874
Gross Amount Carried at close of period 12/31/2020, Land	23,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	69,866,312
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	93,266,312
Accumulated Depreciation	(41,469,709)
Investment in Real Estate, Net	51,796,603
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	4,223,339
Gross Amount Carried at close of period 12/31/2020, Land	15,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	39,697,675
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	55,097,675
Accumulated Depreciation	(13,360,668)
Investment in Real Estate, Net	41,737,007
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	5,063,378
Gross Amount Carried at close of period 12/31/2020, Land	5,111,200
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	16,973,816
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	22,085,016
Accumulated Depreciation	(12,541,852)
Investment in Real Estate, Net	9,543,164
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	95,579
Gross Amount Carried at close of period 12/31/2020, Land	16,807,519
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	64,615,094
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	81,422,613
Accumulated Depreciation	(13,686,832)
Investment in Real Estate, Net	67,735,781
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	139,564,405
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	75,093
Gross Amount Carried at close of period 12/31/2020, Land	30,224,393
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	139,639,498
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	169,863,891
Accumulated Depreciation	(22,296,095)
Investment in Real Estate, Net	147,567,796
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	6,922,941
Gross Amount Carried at close of period 12/31/2020, Land	22,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	35,595,920
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	57,795,920
Accumulated Depreciation	(11,405,705)
Investment in Real Estate, Net	46,390,215
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	2,166,746
Gross Amount Carried at close of period 12/31/2020, Land	32,250,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	112,916,746
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	145,166,746
Accumulated Depreciation	(35,114,578)
Investment in Real Estate, Net	110,052,168
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	1,230,863
Gross Amount Carried at close of period 12/31/2020, Land	5,911,041
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	21,185,822
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	27,096,863
Accumulated Depreciation	(4,881,973)
Investment in Real Estate, Net	22,214,890
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	6,888,757
Gross Amount Carried at close of period 12/31/2020, Land	40,504,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	24,914,436
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	65,418,436
Accumulated Depreciation	(14,944,137)
Investment in Real Estate, Net	50,474,299
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	7,768,599
Gross Amount Carried at close of period 12/31/2020, Land	37,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	17,624,196
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	55,224,196
Accumulated Depreciation	(12,262,578)
Investment in Real Estate, Net	42,961,618
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	9,759,837
Gross Amount Carried at close of period 12/31/2020, Land	52,654,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	32,805,588
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	85,459,588
Accumulated Depreciation	(20,290,750)
Investment in Real Estate, Net	65,168,838
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	13,101,902
Gross Amount Carried at close of period 12/31/2020, Land	102,163,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	122,091,304
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	224,254,304
Accumulated Depreciation	(60,987,908)
Investment in Real Estate, Net	163,266,396
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	65,100,751
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	753,908
Gross Amount Carried at close of period 12/31/2020, Land	16,667,059
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	65,854,659
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	82,521,718
Accumulated Depreciation	(14,664,513)
Investment in Real Estate, Net	67,857,205
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	2,161,224
Gross Amount Carried at close of period 12/31/2020, Land	13,700,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	61,248,743
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	74,948,743
Accumulated Depreciation	(18,692,087)
Investment in Real Estate, Net	56,256,656
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	12,931,215
Gross Amount Carried at close of period 12/31/2020, Land	3,033,500
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	40,233,598
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	43,267,098
Accumulated Depreciation	(32,562,373)
Investment in Real Estate, Net	10,704,725
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	8,446,035
Gross Amount Carried at close of period 12/31/2020, Land	6,246,700
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	20,273,488
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	26,520,188
Accumulated Depreciation	(14,157,450)
Investment in Real Estate, Net	12,362,738
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	1,126,346
Gross Amount Carried at close of period 12/31/2020, Land	6,972,585
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,653,761
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	34,626,346
Accumulated Depreciation	(6,325,802)
Investment in Real Estate, Net	28,300,544
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	6,550,150
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	127,345,509
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	127,345,509
Accumulated Depreciation	(43,885,705)
Investment in Real Estate, Net	83,459,804
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	7,302,934
Gross Amount Carried at close of period 12/31/2020, Land	18,094,052
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	89,208,882
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	107,302,934
Accumulated Depreciation	(35,775,990)
Investment in Real Estate, Net	71,526,944
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	24,084,348
Gross Amount Carried at close of period 12/31/2020, Land	35,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	57,558,170
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	92,658,170
Accumulated Depreciation	(34,060,220)
Investment in Real Estate, Net	58,597,950
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	3,963,453
Gross Amount Carried at close of period 12/31/2020, Land	3,572,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,624,447
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	22,196,847
Accumulated Depreciation	(14,859,876)
Investment in Real Estate, Net	7,336,971
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	6,277,627
Gross Amount Carried at close of period 12/31/2020, Land	8,640,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,764,753
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	36,404,753
Accumulated Depreciation	(18,614,995)
Investment in Real Estate, Net	17,789,758
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	26,069,539
Gross Amount Carried at close of period 12/31/2020, Land	22,487,006
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	122,912,452
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	145,399,458
Accumulated Depreciation	(93,853,487)
Investment in Real Estate, Net	51,545,971
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	181,855,868
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	989,838
Gross Amount Carried at close of period 12/31/2020, Land	40,830,011
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	182,845,706
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	223,675,717
Accumulated Depreciation	(33,782,465)
Investment in Real Estate, Net	189,893,252
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	6,662,673
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	74,639,986
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	74,639,986
Accumulated Depreciation	(24,014,696)
Investment in Real Estate, Net	50,625,290
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	4,771,834
Gross Amount Carried at close of period 12/31/2020, Land	34,625,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	82,651,574
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	117,276,574
Accumulated Depreciation	(35,430,836)
Investment in Real Estate, Net	81,845,738
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	171,726,887
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	231,618
Gross Amount Carried at close of period 12/31/2020, Land	76,292,169
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	171,958,505
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	248,250,674
Accumulated Depreciation	(38,979,951)
Investment in Real Estate, Net	209,270,723
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	12,726,006
Gross Amount Carried at close of period 12/31/2020, Land	28,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	82,521,921
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	110,721,921
Accumulated Depreciation	(47,521,592)
Investment in Real Estate, Net	63,200,329
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	5,058,503
Gross Amount Carried at close of period 12/31/2020, Land	3,573,621
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	24,114,008
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	27,687,629
Accumulated Depreciation	(13,078,610)
Investment in Real Estate, Net	14,609,019
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	4,822,863
Gross Amount Carried at close of period 12/31/2020, Land	26,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	89,234,025
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	116,134,025
Accumulated Depreciation	(28,874,667)
Investment in Real Estate, Net	87,259,358
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	1,070,656
Gross Amount Carried at close of period 12/31/2020, Land	13,644,960
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	122,969,740
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	136,614,700
Accumulated Depreciation	(14,861,159)
Investment in Real Estate, Net	121,753,541
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	1,554,405
Gross Amount Carried at close of period 12/31/2020, Land	15,546,376
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	66,874,415
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	82,420,791
Accumulated Depreciation	(22,940,448)
Investment in Real Estate, Net	59,480,343
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	1,923,709
Gross Amount Carried at close of period 12/31/2020, Land	10,300,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	35,412,454
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	45,712,454
Accumulated Depreciation	(12,697,765)
Investment in Real Estate, Net	33,014,689
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	8,166,256
Gross Amount Carried at close of period 12/31/2020, Land	1,857,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	24,879,510
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	26,736,910
Accumulated Depreciation	(20,072,599)
Investment in Real Estate, Net	6,664,311
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	5,015,196
Gross Amount Carried at close of period 12/31/2020, Land	10,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	57,828,131
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	68,328,131
Accumulated Depreciation	(34,812,389)
Investment in Real Estate, Net	33,515,742
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	5,104,139
Gross Amount Carried at close of period 12/31/2020, Land	6,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	39,689,199
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	46,189,199
Accumulated Depreciation	(23,797,415)
Investment in Real Estate, Net	22,391,784
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	5,402,223
Gross Amount Carried at close of period 12/31/2020, Land	16,345,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	78,482,893
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	94,827,893
Accumulated Depreciation	(41,826,076)
Investment in Real Estate, Net	53,001,817
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	13,200,537
Gross Amount Carried at close of period 12/31/2020, Land	15,804,057
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	76,329,588
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	92,133,645
Accumulated Depreciation	(47,641,317)
Investment in Real Estate, Net	44,492,328
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	7,682,065
Gross Amount Carried at close of period 12/31/2020, Land	27,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	40,711,670
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	67,711,670
Accumulated Depreciation	(14,792,142)
Investment in Real Estate, Net	52,919,528
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	18,128,215
Gross Amount Carried at close of period 12/31/2020, Land	11,918,917
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	86,990,856
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	98,909,773
Accumulated Depreciation	(49,807,938)
Investment in Real Estate, Net	49,101,835
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	9,950,448
Gross Amount Carried at close of period 12/31/2020, Land	16,768,705
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	87,574,112
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	104,342,817
Accumulated Depreciation	(39,942,888)
Investment in Real Estate, Net	64,399,929
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	109,261,438
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	603,327
Gross Amount Carried at close of period 12/31/2020, Land	17,859,785
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	109,864,765
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	127,724,550
Accumulated Depreciation	(30,747,047)
Investment in Real Estate, Net	96,977,503
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	119,401
Gross Amount Carried at close of period 12/31/2020, Land	12,118,248
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	40,605,868
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	52,724,116
Accumulated Depreciation	(9,059,400)
Investment in Real Estate, Net	43,664,716
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	1,594,173
Gross Amount Carried at close of period 12/31/2020, Land	4,430,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	30,892,269
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,322,269
Accumulated Depreciation	(13,558,016)
Investment in Real Estate, Net	21,764,253
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	6,762,215
Gross Amount Carried at close of period 12/31/2020, Land	11,809,500
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	40,766,263
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	52,575,763
Accumulated Depreciation	(29,418,122)
Investment in Real Estate, Net	23,157,641
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	8,097,405
Gross Amount Carried at close of period 12/31/2020, Land	34,963,355
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	92,685,063
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	127,648,418
Accumulated Depreciation	(31,553,572)
Investment in Real Estate, Net	96,094,846
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	4,063,635
Gross Amount Carried at close of period 12/31/2020, Land	17,136,645
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	44,600,166
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	61,736,811
Accumulated Depreciation	(13,928,284)
Investment in Real Estate, Net	47,808,527
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	4,803,736
Gross Amount Carried at close of period 12/31/2020, Land	14,355,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	85,697,785
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	100,052,785
Accumulated Depreciation	(30,548,447)
Investment in Real Estate, Net	69,504,338
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	112,730,596
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,283,711
Gross Amount Carried at close of period 12/31/2020, Land	34,340,640
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	116,014,307
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	150,354,947
Accumulated Depreciation	(15,662,554)
Investment in Real Estate, Net	134,692,393
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	1,801,272
Gross Amount Carried at close of period 12/31/2020, Land	4,922,840
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	32,003,432
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	36,926,272
Accumulated Depreciation	(12,228,816)
Investment in Real Estate, Net	24,697,456
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	1,561,995
Gross Amount Carried at close of period 12/31/2020, Land	14,641,990
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	44,420,005
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	59,061,995
Accumulated Depreciation	(17,561,315)
Investment in Real Estate, Net	41,500,680
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	128,652,023
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	373,996
Gross Amount Carried at close of period 12/31/2020, Land	38,805,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	129,026,019
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	167,831,419
Accumulated Depreciation	(9,518,028)
Investment in Real Estate, Net	158,313,391
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	4,639,194
Gross Amount Carried at close of period 12/31/2020, Land	663,800
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	10,613,997
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	11,277,797
Accumulated Depreciation	(8,600,004)
Investment in Real Estate, Net	2,677,793
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	18,847,422
Gross Amount Carried at close of period 12/31/2020, Land	3,342,381
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	50,184,754
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	53,527,135
Accumulated Depreciation	(41,685,265)
Investment in Real Estate, Net	11,841,870
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	8,661,820
Gross Amount Carried at close of period 12/31/2020, Land	8,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	32,744,844
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	41,644,844
Accumulated Depreciation	(24,001,604)
Investment in Real Estate, Net	17,643,240
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	6,581,900
Gross Amount Carried at close of period 12/31/2020, Land	10,560,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	32,156,357
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	42,716,357
Accumulated Depreciation	(21,036,234)
Investment in Real Estate, Net	21,680,123
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	5,763,877
Gross Amount Carried at close of period 12/31/2020, Land	1,781,600
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	22,495,793
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	24,277,393
Accumulated Depreciation	(16,357,971)
Investment in Real Estate, Net	7,919,422
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	6,109,768
Gross Amount Carried at close of period 12/31/2020, Land	3,380,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	28,062,631
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	31,442,631
Accumulated Depreciation	(20,168,570)
Investment in Real Estate, Net	11,274,061
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	5,913,784
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2020, Land	29,406,606
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	5,913,784
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,320,390
Accumulated Depreciation	0
Investment in Real Estate, Net	35,320,390
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	6,242,034
Gross Amount Carried at close of period 12/31/2020, Land	7,503,400
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	30,290,541
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	37,793,941
Accumulated Depreciation	(22,570,636)
Investment in Real Estate, Net	15,223,305
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	5,874,314
Gross Amount Carried at close of period 12/31/2020, Land	68,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	85,351,175
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	154,251,175
Accumulated Depreciation	(27,619,642)
Investment in Real Estate, Net	126,631,533
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	7,029,392
Gross Amount Carried at close of period 12/31/2020, Land	6,936,600
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	21,353,461
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	28,290,061
Accumulated Depreciation	(14,889,800)
Investment in Real Estate, Net	13,400,261
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	462,653
Gross Amount Carried at close of period 12/31/2020, Land	9,163,667
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	48,373,634
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	57,537,301
Accumulated Depreciation	(8,167,981)
Investment in Real Estate, Net	49,369,320
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	466,898
Gross Amount Carried at close of period 12/31/2020, Land	25,326,048
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	80,442,929
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	105,768,977
Accumulated Depreciation	(8,160,539)
Investment in Real Estate, Net	97,608,438
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	8,738,634
Gross Amount Carried at close of period 12/31/2020, Land	2,890,450
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	32,409,523
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,299,973
Accumulated Depreciation	(26,387,722)
Investment in Real Estate, Net	8,912,251
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	9,988,645
Gross Amount Carried at close of period 12/31/2020, Land	26,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	38,423,669
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	64,423,669
Accumulated Depreciation	(15,803,477)
Investment in Real Estate, Net	48,620,192
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	1,160,581
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	60,042,454
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	60,042,454
Accumulated Depreciation	(18,298,459)
Investment in Real Estate, Net	41,743,995
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	2,504,676
Gross Amount Carried at close of period 12/31/2020, Land	14,087,610
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,818,827
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	32,906,437
Accumulated Depreciation	(7,920,298)
Investment in Real Estate, Net	24,986,139
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	9,395,974
Gross Amount Carried at close of period 12/31/2020, Land	26,767,171
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	228,218,702
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	254,985,873
Accumulated Depreciation	(94,757,814)
Investment in Real Estate, Net	160,228,059
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	969,854
Gross Amount Carried at close of period 12/31/2020, Land	7,030,766
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	29,975,616
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	37,006,382
Accumulated Depreciation	(8,984,046)
Investment in Real Estate, Net	28,022,336
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	25,605,818
Gross Amount Carried at close of period 12/31/2020, Land	39,410,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	76,411,890
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	115,821,890
Accumulated Depreciation	(48,052,411)
Investment in Real Estate, Net	67,769,479
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	2,157,467
Gross Amount Carried at close of period 12/31/2020, Land	34,641,051
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	183,764,798
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	218,405,849
Accumulated Depreciation	(23,789,711)
Investment in Real Estate, Net	194,616,138
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	2,625,630
Gross Amount Carried at close of period 12/31/2020, Land	12,542,418
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	78,425,720
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	90,968,138
Accumulated Depreciation	(23,312,467)
Investment in Real Estate, Net	67,655,671
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Town Square at Mark Center I&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	678
Initial Cost to Company, Land	$ 39,928,464
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	141,208,321
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	14,623,345
Gross Amount Carried at close of period 12/31/2020, Land	39,928,464
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	155,831,666
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	195,760,130
Accumulated Depreciation	(76,590,730)
Investment in Real Estate, Net	119,169,400
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	5,060,085
Gross Amount Carried at close of period 12/31/2020, Land	8,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,248,373
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	36,048,373
Accumulated Depreciation	(13,875,497)
Investment in Real Estate, Net	22,172,876
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	2,058,051
Gross Amount Carried at close of period 12/31/2020, Land	15,322,724
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	78,234,645
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	93,557,369
Accumulated Depreciation	(25,659,124)
Investment in Real Estate, Net	67,898,245
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	166,209
Gross Amount Carried at close of period 12/31/2020, Land	8,355,048
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	83,918,898
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	92,273,946
Accumulated Depreciation	(7,716,962)
Investment in Real Estate, Net	84,556,984
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	4,635,959
Gross Amount Carried at close of period 12/31/2020, Land	5,190,700
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	14,315,068
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	19,505,768
Accumulated Depreciation	(11,286,870)
Investment in Real Estate, Net	8,218,898
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	4,297,795
Gross Amount Carried at close of period 12/31/2020, Land	18,539,817
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	134,705,160
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	153,244,977
Accumulated Depreciation	(53,262,783)
Investment in Real Estate, Net	99,982,194
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	8,575,157
Gross Amount Carried at close of period 12/31/2020, Land	12,650,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	42,231,449
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	54,881,449
Accumulated Depreciation	(26,065,056)
Investment in Real Estate, Net	28,816,393
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	1,913,803
Gross Amount Carried at close of period 12/31/2020, Land	10,590,975
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	46,322,828
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	56,913,803
Accumulated Depreciation	(20,170,940)
Investment in Real Estate, Net	36,742,863
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	2,023,741
Gross Amount Carried at close of period 12/31/2020, Land	10,350,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	37,457,178
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	47,807,178
Accumulated Depreciation	(18,425,633)
Investment in Real Estate, Net	29,381,545
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Villa Solana [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Laguna Hills, CA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	272
Initial Cost to Company, Land	$ 1,665,100
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	14,985,678
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	12,946,281
Gross Amount Carried at close of period 12/31/2020, Land	1,665,100
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,931,959
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	29,597,059
Accumulated Depreciation	(23,035,555)
Investment in Real Estate, Net	6,561,504
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	3,573,169
Gross Amount Carried at close of period 12/31/2020, Land	15,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	44,432,565
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	59,532,565
Accumulated Depreciation	(15,023,903)
Investment in Real Estate, Net	44,508,662
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	6,137,694
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	92,077,697
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	92,077,697
Accumulated Depreciation	(29,622,313)
Investment in Real Estate, Net	62,455,384
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	177,555,213
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	840,226
Gross Amount Carried at close of period 12/31/2020, Land	27,709,329
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	178,395,439
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	206,104,768
Accumulated Depreciation	(33,946,303)
Investment in Real Estate, Net	172,158,465
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	19,765,337
Gross Amount Carried at close of period 12/31/2020, Land	4,525,800
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	60,501,630
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	65,027,430
Accumulated Depreciation	(52,909,405)
Investment in Real Estate, Net	12,118,025
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	4,982,240
Gross Amount Carried at close of period 12/31/2020, Land	12,448,888
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	57,026,688
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	69,475,576
Accumulated Depreciation	(23,325,875)
Investment in Real Estate, Net	46,149,701
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	10,793,415
Gross Amount Carried at close of period 12/31/2020, Land	34,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	119,279,274
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	153,679,274
Accumulated Depreciation	(39,652,580)
Investment in Real Estate, Net	114,026,694
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	1,904,484
Gross Amount Carried at close of period 12/31/2020, Land	16,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	35,978,540
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	52,778,540
Accumulated Depreciation	(11,625,233)
Investment in Real Estate, Net	41,153,307
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
West 96th [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	New York, NY
Real Estate And Accumulated Depreciation Units | ApartmentUnit	207
Initial Cost to Company, Land	$ 84,800,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	67,055,502
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,658,093
Gross Amount Carried at close of period 12/31/2020, Land	84,800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	73,713,595
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	158,513,595
Accumulated Depreciation	(26,104,839)
Investment in Real Estate, Net	132,408,756
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	5,461,544
Gross Amount Carried at close of period 12/31/2020, Land	469,546
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	168,584,566
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	169,054,112
Accumulated Depreciation	(73,099,324)
Investment in Real Estate, Net	95,954,788
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	1,316,004
Gross Amount Carried at close of period 12/31/2020, Land	10,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	45,451,211
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	56,051,211
Accumulated Depreciation	(14,255,122)
Investment in Real Estate, Net	41,796,089
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	6,257,673
Gross Amount Carried at close of period 12/31/2020, Land	64,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	67,400,932
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	132,300,932
Accumulated Depreciation	(21,887,315)
Investment in Real Estate, Net	110,413,617
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	3,357,625
Gross Amount Carried at close of period 12/31/2020, Land	34,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	60,320,255
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	94,520,255
Accumulated Depreciation	(19,197,241)
Investment in Real Estate, Net	75,323,014
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	1,182,445
Gross Amount Carried at close of period 12/31/2020, Land	3,060,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	6,721,316
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	9,781,316
Accumulated Depreciation	(4,457,210)
Investment in Real Estate, Net	5,324,106
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	764,582
Gross Amount Carried at close of period 12/31/2020, Land	1,530,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	3,788,105
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	5,318,105
Accumulated Depreciation	(2,501,385)
Investment in Real Estate, Net	2,816,720
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	778,767
Gross Amount Carried at close of period 12/31/2020, Land	1,785,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	4,012,021
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	5,797,021
Accumulated Depreciation	(2,711,404)
Investment in Real Estate, Net	3,085,617
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	794,239
Gross Amount Carried at close of period 12/31/2020, Land	1,955,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	4,335,674
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	6,290,674
Accumulated Depreciation	(2,865,440)
Investment in Real Estate, Net	3,425,234
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	1,223,921
Gross Amount Carried at close of period 12/31/2020, Land	3,060,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	6,763,311
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	9,823,311
Accumulated Depreciation	(4,471,969)
Investment in Real Estate, Net	5,351,342
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	2,909,316
Gross Amount Carried at close of period 12/31/2020, Land	9,605,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	22,892,701
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	32,497,701
Accumulated Depreciation	(14,993,719)
Investment in Real Estate, Net	17,503,982
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	13,127,981
Gross Amount Carried at close of period 12/31/2020, Land	2,662,900
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	37,113,478
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	39,776,378
Accumulated Depreciation	(30,933,234)
Investment in Real Estate, Net	8,843,144
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	10,421,107
Gross Amount Carried at close of period 12/31/2020, Land	9,729,900
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	33,430,875
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	43,160,775
Accumulated Depreciation	(25,852,279)
Investment in Real Estate, Net	17,308,496
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	16,988,182
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,182,183
Gross Amount Carried at close of period 12/31/2020, Land	8,550,600
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	23,170,365
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	31,720,965
Accumulated Depreciation	(17,242,110)
Investment in Real Estate, Net	14,478,855
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	138,223,005
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	138,223,005
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	138,223,005
Accumulated Depreciation	(104,607,870)
Investment in Real Estate, Net	33,615,135
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	1,543,343
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	1,543,343
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	1,543,343
Accumulated Depreciation	0
Investment in Real Estate, Net	1,543,343
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	107,757
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	107,757
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	107,757
Accumulated Depreciation	(66,902)
Investment in Real Estate, Net	40,855
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	64,363
Initial Cost to Company, Land	$ 4,875,308,605
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	16,033,230,297
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,620,022,325
Gross Amount Carried at close of period 12/31/2020, Land	4,875,308,605
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	17,653,252,622
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	22,528,561,227
Accumulated Depreciation	(6,521,859,521)
Investment in Real Estate, Net	16,006,701,706
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	517,009
Gross Amount Carried at close of period 12/31/2020, Land	18,937,702
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	95,275,688
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	114,213,390
Accumulated Depreciation	(28,767,103)
Investment in Real Estate, Net	85,446,287
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 86,236,221
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	7,046,134
Gross Amount Carried at close of period 12/31/2020, Land	13,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	82,317,313
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	95,317,313
Accumulated Depreciation	(27,334,401)
Investment in Real Estate, Net	$ 67,982,912
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	5,841,752
Gross Amount Carried at close of period 12/31/2020, Land	48,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	102,016,391
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	150,916,391
Accumulated Depreciation	(32,773,924)
Investment in Real Estate, Net	118,142,467
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 62,517,552
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	10,883,739
Gross Amount Carried at close of period 12/31/2020, Land	79,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	90,006,363
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	169,406,363
Accumulated Depreciation	(30,023,726)
Investment in Real Estate, Net	$ 139,382,637
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	3,879,039
Gross Amount Carried at close of period 12/31/2020, Land	12,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	38,273,811
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	50,873,811
Accumulated Depreciation	(12,637,343)
Investment in Real Estate, Net	$ 38,236,468
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
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	1,621,195
Gross Amount Carried at close of period 12/31/2020, Land	11,379,497
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	50,981,698
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	62,361,195
Accumulated Depreciation	(13,657,401)
Investment in Real Estate, Net	48,703,794
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 26,717,175
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	2,177,087
Gross Amount Carried at close of period 12/31/2020, Land	7,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	22,714,446
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	29,714,446
Accumulated Depreciation	(13,941,438)
Investment in Real Estate, Net	15,773,008
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 35,608,719
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	18,497,682
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,201,662
Gross Amount Carried at close of period 12/31/2020, Land	12,960,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	22,699,344
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	35,659,344
Accumulated Depreciation	(12,149,740)
Investment in Real Estate, Net	23,509,604
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 28,029,688
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	6,957,817
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	121,279,436
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	121,279,436
Accumulated Depreciation	(36,961,367)
Investment in Real Estate, Net	84,318,069
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 83,594,553
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	2,813,918
Gross Amount Carried at close of period 12/31/2020, Land	12,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	46,341,297
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	58,941,297
Accumulated Depreciation	(14,908,145)
Investment in Real Estate, Net	$ 44,033,152
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
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	2,159,124
Gross Amount Carried at close of period 12/31/2020, Land	9,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	19,109,450
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	28,109,450
Accumulated Depreciation	(6,341,008)
Investment in Real Estate, Net	$ 21,768,442
Real Estate And Accumulated Depreciation, Encumbrances Reference	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	3,982,736
Gross Amount Carried at close of period 12/31/2020, Land	6,863,792
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	40,458,944
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	47,322,736
Accumulated Depreciation	(16,998,993)
Investment in Real Estate, Net	30,323,743
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 39,604,834
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	6,478,149
Gross Amount Carried at close of period 12/31/2020, Land	18,300,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	72,870,563
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	91,170,563
Accumulated Depreciation	(23,146,687)
Investment in Real Estate, Net	$ 68,023,876
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
Columbia Crossing [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Arlington, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	247
Initial Cost to Company, Land	$ 23,500,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	53,045,073
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	3,332,258
Gross Amount Carried at close of period 12/31/2020, Land	23,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	56,377,331
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	79,877,331
Accumulated Depreciation	(18,786,207)
Investment in Real Estate, Net	$ 61,091,124
Real Estate And Accumulated Depreciation, Encumbrances Reference	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	1,113,113
Gross Amount Carried at close of period 12/31/2020, Land	14,080,560
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	57,532,553
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	71,613,113
Accumulated Depreciation	(16,339,803)
Investment in Real Estate, Net	55,273,310
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 38,377,191
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	2,978,093
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	126,737,897
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	126,737,897
Accumulated Depreciation	(41,055,149)
Investment in Real Estate, Net	$ 85,682,748
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
Fairchase [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Fairfax, VA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	392
Initial Cost to Company, Land	$ 23,500,000
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	87,722,321
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,898,989
Gross Amount Carried at close of period 12/31/2020, Land	23,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	89,621,310
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	113,121,310
Accumulated Depreciation	(27,669,103)
Investment in Real Estate, Net	$ 85,452,207
Real Estate And Accumulated Depreciation, Encumbrances Reference	0
Fairfield [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Stamford, CT
Real Estate And Accumulated Depreciation Units | ApartmentUnit	263
Initial Cost to Company, Land	$ 6,510,200
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	39,690,120
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	9,558,884
Gross Amount Carried at close of period 12/31/2020, Land	6,510,200
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	49,249,004
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	55,759,204
Accumulated Depreciation	(38,011,328)
Investment in Real Estate, Net	17,747,876
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 31,415,078
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	4,360,800
Gross Amount Carried at close of period 12/31/2020, Land	35,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	113,128,998
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	148,328,998
Accumulated Depreciation	(33,817,504)
Investment in Real Estate, Net	$ 114,511,494
Real Estate And Accumulated Depreciation, Encumbrances Reference	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	3,698,250
Gross Amount Carried at close of period 12/31/2020, Land	16,047,023
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	52,349,213
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	68,396,236
Accumulated Depreciation	(19,833,118)
Investment in Real Estate, Net	48,563,118
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 32,536,206
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	1,918,209
Gross Amount Carried at close of period 12/31/2020, Land	5,425,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	23,056,237
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	28,481,237
Accumulated Depreciation	(11,613,731)
Investment in Real Estate, Net	16,867,506
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 22,574,473
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	34,846,856
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	960,195
Gross Amount Carried at close of period 12/31/2020, Land	10,752,145
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	35,807,051
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	46,559,196
Accumulated Depreciation	(15,665,700)
Investment in Real Estate, Net	30,893,496
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 26,250,120
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	4,295,836
Gross Amount Carried at close of period 12/31/2020, Land	14,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	28,958,719
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	43,058,719
Accumulated Depreciation	(16,005,176)
Investment in Real Estate, Net	27,053,543
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 37,607,274
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	3,595,476
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	44,846,520
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	44,846,520
Accumulated Depreciation	(21,415,715)
Investment in Real Estate, Net	23,430,805
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 25,018,990
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	2,226,777
Gross Amount Carried at close of period 12/31/2020, Land	5,805,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,931,777
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	33,736,777
Accumulated Depreciation	(11,253,531)
Investment in Real Estate, Net	22,483,246
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 28,028,542
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	948,447
Gross Amount Carried at close of period 12/31/2020, Land	20,100,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	68,857,470
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	88,957,470
Accumulated Depreciation	(20,702,192)
Investment in Real Estate, Net	68,255,278
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 42,977,538
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	11,851,439
Gross Amount Carried at close of period 12/31/2020, Land	20,880,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	102,106,948
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	122,986,948
Accumulated Depreciation	(53,169,019)
Investment in Real Estate, Net	69,817,929
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 84,236,459
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	2,503,132
Gross Amount Carried at close of period 12/31/2020, Land	8,540,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	14,713,113
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	23,253,113
Accumulated Depreciation	(7,824,496)
Investment in Real Estate, Net	15,428,617
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 21,479,983
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	2,077,059
Gross Amount Carried at close of period 12/31/2020, Land	12,649,228
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	38,919,071
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	51,568,299
Accumulated Depreciation	(16,192,358)
Investment in Real Estate, Net	$ 35,375,941
Real Estate And Accumulated Depreciation, Encumbrances Reference	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	8,739,937
Gross Amount Carried at close of period 12/31/2020, Land	8,160,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	38,100,875
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	46,260,875
Accumulated Depreciation	(27,667,597)
Investment in Real Estate, Net	18,593,278
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 60,994,469
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	911,878
Gross Amount Carried at close of period 12/31/2020, Land	7,740,467
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	45,058,059
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	52,798,526
Accumulated Depreciation	(10,447,662)
Investment in Real Estate, Net	42,350,864
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 35,552,619
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	11,508,550
Gross Amount Carried at close of period 12/31/2020, Land	14,752,034
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	84,843,975
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	99,596,009
Accumulated Depreciation	(49,773,869)
Investment in Real Estate, Net	49,822,140
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 94,702,663
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	14,964,633
Gross Amount Carried at close of period 12/31/2020, Land	71,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	226,871,774
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	298,771,774
Accumulated Depreciation	(72,984,554)
Investment in Real Estate, Net	$ 225,787,220
Real Estate And Accumulated Depreciation, Encumbrances Reference	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	677,621
Gross Amount Carried at close of period 12/31/2020, Land	13,562,331
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	127,037,939
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	140,600,270
Accumulated Depreciation	(15,522,629)
Investment in Real Estate, Net	125,077,641
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 74,151,572
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	16,836,498
Gross Amount Carried at close of period 12/31/2020, Land	79,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	194,153,475
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	274,053,475
Accumulated Depreciation	(60,659,528)
Investment in Real Estate, Net	$ 213,393,947
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	133,045
Gross Amount Carried at close of period 12/31/2020, Land	7,222,544
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,410,501
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	33,633,045
Accumulated Depreciation	(7,302,057)
Investment in Real Estate, Net	$ 26,330,988
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	8,105,506
Gross Amount Carried at close of period 12/31/2020, Land	28,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	70,022,176
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	98,622,176
Accumulated Depreciation	(36,713,370)
Investment in Real Estate, Net	61,908,806
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	3,323,418
Gross Amount Carried at close of period 12/31/2020, Land	42,580,326
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	59,338,092
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	101,918,418
Accumulated Depreciation	(16,037,599)
Investment in Real Estate, Net	85,880,819
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 38,562,939
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	1,982,739
Gross Amount Carried at close of period 12/31/2020, Land	7,059,230
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	49,660,501
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	56,719,731
Accumulated Depreciation	(25,190,161)
Investment in Real Estate, Net	31,529,570
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 49,111,234
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	1,968,533
Gross Amount Carried at close of period 12/31/2020, Land	9,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	15,930,056
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	24,930,056
Accumulated Depreciation	(5,447,549)
Investment in Real Estate, Net	$ 19,482,507
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	4,524,296
Gross Amount Carried at close of period 12/31/2020, Land	60,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	52,718,133
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	113,618,133
Accumulated Depreciation	(18,850,602)
Investment in Real Estate, Net	94,767,531
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 49,193,451
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	4,125,453
Gross Amount Carried at close of period 12/31/2020, Land	22,898,848
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	137,592,611
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	160,491,459
Accumulated Depreciation	(46,995,276)
Investment in Real Estate, Net	113,496,183
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 96,433,496
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 12/31/2020, 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	$ 798,691,865
Investment in Real Estate - Wholly Owned Encumbered [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Units | ApartmentUnit	10,127
Initial Cost to Company, Land	$ 842,305,927
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,668,597,698
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	193,678,425
Gross Amount Carried at close of period 12/31/2020, Land	842,305,927
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	2,862,276,123
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	3,704,582,050
Accumulated Depreciation	(1,032,587,859)
Investment in Real Estate, Net	2,671,994,191
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 2,088,144,904
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	7,820,623
Gross Amount Carried at close of period 12/31/2020, Land	796,800
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	14,994,348
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	15,791,148
Accumulated Depreciation	(12,389,244)
Investment in Real Estate, Net	3,401,904
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
9th & 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	7,017,002
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	7,017,002
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	7,017,002
Accumulated Depreciation	0
Investment in Real Estate, Net	7,017,002
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
Bellevue Meadows [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Description Of Location	Bellevue, WA
Real Estate And Accumulated Depreciation Units | ApartmentUnit	180
Initial Cost to Company, Land	$ 4,507,100
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	12,574,814
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	6,087,865
Gross Amount Carried at close of period 12/31/2020, Land	4,507,100
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	18,662,679
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	23,169,779
Accumulated Depreciation	(14,585,459)
Investment in Real Estate, Net	8,584,320
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	11,955,063
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	4,258,637
Gross Amount Carried at close of period 12/31/2020, Land	4,869,448
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	16,213,700
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	21,083,148
Accumulated Depreciation	(12,460,975)
Investment in Real Estate, Net	8,622,173
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	7,563,839
Gross Amount Carried at close of period 12/31/2020, Land	6,105,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	37,125,704
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	43,230,704
Accumulated Depreciation	(23,902,034)
Investment in Real Estate, Net	19,328,670
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	5,832,090
Gross Amount Carried at close of period 12/31/2020, Land	7,600,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	41,676,435
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	49,276,435
Accumulated Depreciation	(14,608,832)
Investment in Real Estate, Net	34,667,603
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	7,999,330
Gross Amount Carried at close of period 12/31/2020, Land	6,945,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	31,064,306
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	38,009,306
Accumulated Depreciation	(21,090,571)
Investment in Real Estate, Net	16,918,735
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	394,749
Gross Amount Carried at close of period 12/31/2020, Land	32,494,154
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	85,039,951
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	117,534,105
Accumulated Depreciation	(15,147,227)
Investment in Real Estate, Net	102,386,878
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	4,712,510
Gross Amount Carried at close of period 12/31/2020, Land	5,460,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	20,434,080
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	25,894,080
Accumulated Depreciation	(14,750,661)
Investment in Real Estate, Net	11,143,419
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	7,030,910
Gross Amount Carried at close of period 12/31/2020, Land	5,345,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	27,421,528
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	32,766,528
Accumulated Depreciation	(18,045,457)
Investment in Real Estate, Net	14,721,071
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	5,732,766
Gross Amount Carried at close of period 12/31/2020, Land	4,550,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	23,797,530
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	28,347,530
Accumulated Depreciation	(16,050,917)
Investment in Real Estate, Net	12,296,613
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	3,698,582
Gross Amount Carried at close of period 12/31/2020, Land	3,057,100
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	11,547,200
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	14,604,300
Accumulated Depreciation	(8,809,623)
Investment in Real Estate, Net	5,794,677
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	151,520,448
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	518,736
Gross Amount Carried at close of period 12/31/2020, Land	26,626,497
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	152,039,184
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	178,665,681
Accumulated Depreciation	(21,480,824)
Investment in Real Estate, Net	157,184,857
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 0
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	3,833,548
Gross Amount Carried at close of period 12/31/2020, Land	5,500,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	19,050,161
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	24,550,161
Accumulated Depreciation	(10,768,560)
Investment in Real Estate, Net	13,781,601
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	9,606,448
Gross Amount Carried at close of period 12/31/2020, Land	5,055,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	47,995,120
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	53,050,120
Accumulated Depreciation	(27,453,256)
Investment in Real Estate, Net	25,596,864
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	2,699
Initial Cost to Company, Land	$ 118,911,099
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	478,988,295
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	75,090,633
Gross Amount Carried at close of period 12/31/2020, Land	118,911,099
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	554,078,928
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	672,990,027
Accumulated Depreciation	(231,543,640)
Investment in Real Estate, Net	441,446,387
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	77,932,171
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	0
Gross Amount Carried at close of period 12/31/2020, Land	13,107,242
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	77,932,171
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	91,039,413
Accumulated Depreciation	0
Investment in Real Estate, Net	91,039,413
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 31,493,854
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	8,138,492
Gross Amount Carried at close of period 12/31/2020, Land	5,425,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	26,950,612
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	32,375,612
Accumulated Depreciation	(19,317,572)
Investment in Real Estate, Net	13,058,040
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 28,193,080
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	1,687,416
Gross Amount Carried at close of period 12/31/2020, Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	173,776,771
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	173,776,771
Accumulated Depreciation	(54,348,611)
Investment in Real Estate, Net	119,428,160
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 146,057,885
Partially Owned Encumbered [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Units | ApartmentUnit	700
Initial Cost to Company, Land	$ 18,532,242
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	268,833,646
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	9,825,908
Gross Amount Carried at close of period 12/31/2020, Land	18,532,242
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	278,659,554
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	297,191,796
Accumulated Depreciation	(73,666,183)
Investment in Real Estate, Net	223,525,613
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 205,744,819
Total Consolidated Investment in Real Estate [Member]
Real Estate And Accumulated Depreciation Abstract
Real Estate And Accumulated Depreciation Units | ApartmentUnit	77,889
Initial Cost to Company, Land	$ 5,855,057,873
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	19,449,649,936
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures	1,898,617,291
Gross Amount Carried at close of period 12/31/2020, Land	5,855,057,873
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures	21,348,267,227
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures	27,203,325,100
Accumulated Depreciation	(7,859,657,203)
Investment in Real Estate, Net	19,343,667,897
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 2,293,889,723

Schedule III - Real Estate an_7

Schedule III - Real Estate and Accumulated Depreciation (Parenthetical) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Real Estate And Accumulated Depreciation [Line Items]
Furniture, fixtures and equipment	$ 1,970,033,000	$ 1,916,458,000
Land and depreciable property net	13,800,000,000	$ 13,700,000,000
Depreciable Property [Member]
Real Estate And Accumulated Depreciation [Line Items]
Furniture, fixtures and equipment	$ 1,970,033,328
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