Erp Operating LTD Partnership 10-Q 30 Oct 20 2020 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Oct. 27, 2020
Document Information [Line Items]
Entity Registrant Name	EQUITY RESIDENTIAL
Entity Central Index Key	0000906107
Document Type	10-Q
Document Period End Date	Sep. 30, 2020
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Trading Symbol	EQR
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		372,253,249
Entity Current Reporting Status	Yes
Entity Shell Company	false
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 Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
ERPOP [Member]
Document Information [Line Items]
Entity Registrant Name	ERP OPERATING LIMITED PARTNERSHIP
Entity Central Index Key	0000931182
Document Type	10-Q
Document Period End Date	Sep. 30, 2020
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
No Trading Symbol Flag	true
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Shell 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 Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes

CONSOLIDATED BALANCE SHEETS (Un

CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
ASSETS
Land	$ 5,794,771	$ 5,936,188
Depreciable property	21,076,222	21,319,101
Projects under development	337,696	181,630
Land held for development	103,900	96,688
Investment in real estate	27,312,589	27,533,607
Accumulated depreciation	(7,738,318)	(7,276,786)
Investment in real estate, net	19,574,271	20,256,821
Investments in unconsolidated entities	54,828	52,238
Cash and cash equivalents	178,333	45,753
Restricted deposits	56,881	71,246
Right-of-use assets	502,184	512,774
Other assets	257,481	233,937
Total assets	20,623,978	21,172,769
Liabilities:
Mortgage notes payable, net	2,313,833	1,941,610
Notes, net	6,082,897	6,077,513
Line of credit and commercial paper		1,017,833
Accounts payable and accrued expenses	158,611	94,350
Accrued interest payable	65,669	66,852
Lease liabilities	329,684	331,334
Other liabilities	331,522	346,963
Security deposits	61,453	70,062
Distributions payable	232,237	218,326
Total liabilities	9,575,906	10,164,843
Commitments and contingencies
Redeemable Noncontrolling Interests – Operating Partnership	293,706	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 September 30, 2020 and December 31, 2019	37,280	37,280
Common Shares of beneficial interest, $0.01 par value; 1,000,000,000 shares authorized; 372,239,249 shares issued and outstanding as of September 30, 2020 and 371,670,884 shares issued and outstanding as of December 31, 2019	3,722	3,717
Paid in capital	9,166,018	8,965,577
Retained earnings	1,371,938	1,386,495
Accumulated other comprehensive income (loss)	(61,478)	(77,563)
Total shareholders’ equity	10,517,480	10,315,506
Noncontrolling Interests:
Operating Partnership	232,516	227,837
Partially Owned Properties	4,370	1,183
Total Noncontrolling Interests	236,886	229,020
Total equity	10,754,366	10,544,526
Total liabilities and equity/capital	$ 20,623,978	$ 21,172,769

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) - $ / shares	Sep. 30, 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	372,239,249	371,670,884
Common Stock, Shares, Outstanding	372,239,249	371,670,884

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
REVENUES
Rental income	$ 622,433	$ 685,120	$ 1,958,270	$ 2,016,796
EXPENSES
Property and maintenance	113,065	114,966	333,333	338,497
Real estate taxes and insurance	95,273	87,546	288,043	270,434
Property management	20,196	21,940	71,513	72,705
General and administrative	10,859	11,417	37,212	41,127
Depreciation	200,605	211,478	619,003	616,201
Total expenses	439,998	447,347	1,349,104	1,338,964
Net gain (loss) on sales of real estate properties	(25)	130,565	352,218	269,400
Operating income	182,410	368,338	961,384	947,232
Interest and other income	535	656	4,006	2,581
Other expenses	(4,097)	(2,813)	(8,324)	(11,205)
Interest:
Expense incurred, net	(80,874)	(85,936)	(248,349)	(289,776)
Amortization of deferred financing costs	(2,101)	(2,881)	(6,253)	(8,664)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	95,873	277,364	702,464	640,168
Income and other tax (expense) benefit	(262)	(265)	(502)	(749)
Income (loss) from investments in unconsolidated entities	(246)	(1,152)	(2,445)	66,906
Net gain (loss) on sales of land parcels		1,899		2,077
Net income	95,365	277,846	699,517	708,402
Net (income) loss attributable to Noncontrolling Interests:
Operating Partnership	(3,376)	(9,910)	(24,624)	(25,339)
Partially Owned Properties	(703)	(830)	(14,113)	(2,450)
Net income attributable to controlling interests	91,286	267,106	660,780	680,613
Preferred distributions	(773)	(773)	(2,318)	(2,318)
Net income available to Common Shares	$ 90,513	$ 266,333	$ 658,462	$ 678,295
Earnings per share – basic:
Net income available to Common Shares	$ 0.24	$ 0.72	$ 1.77	$ 1.83
Weighted average Common Shares outstanding	371,869	370,768	371,749	370,227
Earnings per share – diluted:
Net income available to Common Shares	$ 0.24	$ 0.71	$ 1.77	$ 1.82
Weighted average Common Shares outstanding	385,652	386,896	385,973	386,177

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Comprehensive income:
Net income	$ 95,365	$ 277,846	$ 699,517	$ 708,402
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the period			(1,190)	(33,765)
Losses reclassified into earnings from other comprehensive income	5,877	5,757	17,275	14,659
Other comprehensive income (loss)	5,877	5,757	16,085	(19,106)
Comprehensive income	101,242	283,603	715,602	689,296
Comprehensive (income) attributable to Noncontrolling Interests	(4,290)	(10,946)	(39,316)	(27,096)
Comprehensive income attributable to controlling interests	$ 96,952	$ 272,657	$ 676,286	$ 662,200

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 699,517	$ 708,402
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	619,003	616,201
Amortization of deferred financing costs	6,253	8,664
Amortization of above/below market lease intangibles	(53)	(53)
Amortization of discounts and premiums on debt	3,834	10,137
Amortization of deferred settlements on derivative instruments	17,266	14,650
Amortization of right-of-use assets	8,785	9,966
Write-off of pursuit costs	4,864	4,098
(Income) loss from investments in unconsolidated entities	2,445	(66,906)
Distributions from unconsolidated entities – return on capital	100	2,486
Net (gain) loss on sales of real estate properties	(352,218)	(269,400)
Net (gain) loss on sales of land parcels		(2,077)
Net (gain) loss on debt extinguishment		3,381
Realized/unrealized (gain) loss on derivative instruments	50
Compensation paid with Company Common Shares	18,275	20,777
Other operating activities, net	1,805
Changes in assets and liabilities:
(Increase) decrease in other assets	(30,197)	(20,871)
Increase (decrease) in accounts payable and accrued expenses	54,418	57,822
Increase (decrease) in accrued interest payable	(1,183)	11,125
Increase (decrease) in lease liabilities	(1,650)	(1,784)
Increase (decrease) in other liabilities	(8,381)	(15,578)
Increase (decrease) in security deposits	(8,609)	3,140
Net cash provided by operating activities	1,034,324	1,094,180
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(48,898)	(1,147,236)
Investment in real estate – development/other	(157,778)	(137,238)
Capital expenditures to real estate	(92,123)	(128,335)
Non-real estate capital additions	(19,290)	(2,139)
Interest capitalized for real estate under development	(6,880)	(4,801)
Proceeds from disposition of real estate, net	747,600	692,649
Investments in unconsolidated entities	(6,664)	(9,073)
Distributions from unconsolidated entities – return of capital	1,000	78,262
Purchase of investment securities and other investments	(509)	(269)
Net cash provided by (used for) investing activities	416,458	(658,180)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(2,923)	(12,025)
Mortgage notes payable, net:
Proceeds	505,375	295,713
Lump sum payoffs	(127,767)	(723,021)
Scheduled principal repayments	(5,821)	(4,883)
Net gain (loss) on debt extinguishment		(3,381)
Notes, net:
Proceeds		1,194,468
Lump sum payoffs		(450,000)
Line of credit and commercial paper:
Line of credit proceeds	1,870,000	5,850,000
Line of credit repayments	(1,890,000)	(5,850,000)
Commercial paper proceeds	6,726,167	13,341,198
Commercial paper repayments	(7,724,000)	(13,486,000)
Proceeds from (payments on) settlement of derivative instruments	(1,240)	(41,616)
Proceeds from Employee Share Purchase Plan (ESPP)	3,556	2,323
Proceeds from exercise of options	11,426	67,066
Payment of offering costs		(789)
Other financing activities, net	(31)	(49)
Contributions – Noncontrolling Interests – Partially Owned Properties	417	4,594
Contributions – Noncontrolling Interests – Operating Partnership	12
Distributions:
Common Shares	(659,668)	(620,391)
Preferred Shares	(2,318)	(2,318)
Noncontrolling Interests – Operating Partnership	(24,440)	(22,202)
Noncontrolling Interests – Partially Owned Properties	(11,312)	(6,404)
Net cash provided by (used for) financing activities	(1,332,567)	(467,717)
Net increase (decrease) in cash and cash equivalents and restricted deposits	118,215	(31,717)
Cash and cash equivalents and restricted deposits, beginning of period	116,999	116,313
Cash and cash equivalents and restricted deposits, end of period	235,214	84,596
Cash and cash equivalents	178,333	28,777
Restricted deposits	56,881	55,819
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	223,703	246,410
Net cash paid (received) for income and other taxes	(1,092)	918
Amortization of deferred financing costs:
Investment in real estate, net	(180)	(60)
Other assets	1,755	1,808
Mortgage notes payable, net	1,337	3,529
Notes, net	3,341	3,387
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	1,791	8,017
Notes, net	2,043	2,120
Amortization of deferred settlements on derivative instruments:
Other liabilities	(9)	(9)
Accumulated other comprehensive income	17,275	14,659
Write-off of pursuit costs:
Investment in real estate, net	4,621	4,042
Other assets	219	48
Accounts payable and accrued expenses	24	8
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	1,474	(67,900)
Other liabilities	971	994
Realized/unrealized (gain) loss on derivative instruments:
Other assets		2,002
Notes, net		2,277
Other liabilities	1,240	29,486
Accumulated other comprehensive income	(1,190)	(33,765)
Investments in unconsolidated entities:
Investments in unconsolidated entities	(5,164)	(6,973)
Other liabilities	(1,500)	(2,100)
Debt financing costs:
Other assets	(231)	145
Mortgage notes payable, net	$ (2,692)	(2,354)
Notes, net		(10,454)
Other liabilities		638
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets		(491,010)
Other assets		184,116
Lease liabilities		335,096
Other liabilities		$ (28,202)

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - 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, 2018		$ 37,280	$ 3,694	$ 8,935,453	$ 1,261,763	$ (64,986)
Balance, beginning of year at Dec. 31, 2018								$ 228,738	$ (2,293)
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares			3	9,840
Exercise of share options			14	67,052
Employee Share Purchase Plan (ESPP)				2,323
Share-based employee compensation expense:
Restricted shares			2	10,302
Share options				2,185
ESPP discount				502
Offering costs				(789)
Supplemental Executive Retirement Plan (SERP)				(1,539)
Change in market value of Redeemable Noncontrolling Interests –Operating Partnership	$ 114,936			(114,936)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				6,919				(6,919)
PAID IN CAPITAL
Conversion of OP Units into Common Shares			3	9,840
Exercise of share options			14	67,052
Employee Share Purchase Plan (ESPP)				2,323
RETAINED EARNINGS
Net income attributable to controlling interests	680,613				680,613
Common Share distributions					(631,635)
Preferred Share distributions					(2,318)
Accumulated other comprehensive income (loss) - derivative instruments:
Unrealized holding gains (losses) arising during the period	(33,765)					(33,765)
Losses reclassified into earnings from other comprehensive income	(14,659)					14,659
DISTRIBUTIONS
Distributions declared per Common Share outstanding							$ 1.7025
NONCONTROLLING INTERESTS
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(9,843)
Equity compensation associated with Noncontrolling Interests								12,200
Net income attributable to Noncontrolling Interests	25,339							25,339	2,450
Distributions to Noncontrolling Interests								(22,493)	(6,453)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	957							(957)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				6,919				(6,919)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	25,339							25,339	2,450
Contributions by Noncontrolling Interests									4,594
Distributions to Noncontrolling Interests								(22,493)	(6,453)
Balance, end of period at Sep. 30, 2019		37,280	3,713	8,917,312	1,308,423	(84,092)
Balance, end of period at Sep. 30, 2019								226,065	(1,702)
Balance, beginning of year at Jun. 30, 2019		37,280	3,708	8,949,581	1,252,809	(89,849)
Balance, beginning of year at Jun. 30, 2019								227,320	(1,298)
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares			1	4,971
Exercise of share options			4	18,575
Employee Share Purchase Plan (ESPP)				671
Share-based employee compensation expense:
Restricted shares				2,322
Share options				503
ESPP discount				137
Offering costs				(634)
Change in market value of Redeemable Noncontrolling Interests –Operating Partnership				(57,962)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				(852)				852
PAID IN CAPITAL
Conversion of OP Units into Common Shares			1	4,971
Exercise of share options			4	18,575
Employee Share Purchase Plan (ESPP)				671
RETAINED EARNINGS
Net income attributable to controlling interests	267,106				267,106
Common Share distributions					(210,719)
Preferred Share distributions					(773)
Accumulated other comprehensive income (loss) - derivative instruments:
Losses reclassified into earnings from other comprehensive income	(5,757)					5,757
DISTRIBUTIONS
Distributions declared per Common Share outstanding							0.5675
NONCONTROLLING INTERESTS
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(4,972)
Equity compensation associated with Noncontrolling Interests								1,371
Net income attributable to Noncontrolling Interests	9,910							9,910	830
Distributions to Noncontrolling Interests								(7,414)	(1,234)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership								(1,002)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				(852)				852
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	9,910							9,910	830
Distributions to Noncontrolling Interests								(7,414)	(1,234)
Balance, end of period at Sep. 30, 2019		37,280	3,713	8,917,312	1,308,423	(84,092)
Balance, end of period at Sep. 30, 2019								226,065	(1,702)
Balance, beginning of year at Dec. 31, 2019	10,315,506	37,280	3,717	8,965,577	1,386,495	(77,563)
Balance, beginning of year at Dec. 31, 2019	229,020							227,837	1,183
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares			1	3,912
Exercise of share options			2	11,424
Employee Share Purchase Plan (ESPP)				3,556
Share-based employee compensation expense:
Restricted shares			2	9,236
Share options				1,819
ESPP discount				626
Supplemental Executive Retirement Plan (SERP)				(395)
Change in market value of Redeemable Noncontrolling Interests –Operating Partnership	(169,825)			169,825
Adjustment for Noncontrolling Interests ownership in Operating Partnership				438				(438)
PAID IN CAPITAL
Conversion of OP Units into Common Shares			1	3,912
Exercise of share options			2	11,424
Employee Share Purchase Plan (ESPP)				3,556
RETAINED EARNINGS
Net income attributable to controlling interests	660,780				660,780
Common Share distributions					(673,019)
Preferred Share distributions					(2,318)
Accumulated other comprehensive income (loss) - derivative instruments:
Unrealized holding gains (losses) arising during the period	(1,190)					(1,190)
Losses reclassified into earnings from other comprehensive income	(17,275)					17,275
DISTRIBUTIONS
Distributions declared per Common Share outstanding							1.8075
NONCONTROLLING INTERESTS
Issuance of restricted units to Noncontrolling Interests								12
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(3,913)
Equity compensation associated with Noncontrolling Interests								9,525
Net income attributable to Noncontrolling Interests	24,624							24,624	14,113
Distributions to Noncontrolling Interests								(25,000)	(11,343)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	131							(131)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				438				(438)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	24,624							24,624	14,113
Contributions by Noncontrolling Interests									417
Distributions to Noncontrolling Interests								(25,000)	(11,343)
Balance, end of period at Sep. 30, 2020	10,517,480	37,280	3,722	9,166,018	1,371,938	(61,478)
Balance, end of period at Sep. 30, 2020	236,886							232,516	4,370
Balance, beginning of year at Jun. 30, 2020		37,280	3,722	9,118,332	1,505,694	(67,355)
Balance, beginning of year at Jun. 30, 2020								235,169	4,634
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares				57
Exercise of share options				104
Employee Share Purchase Plan (ESPP)				1,197
Share-based employee compensation expense:
Restricted shares				1,984
Share options				526
ESPP discount				210
Supplemental Executive Retirement Plan (SERP)				111
Change in market value of Redeemable Noncontrolling Interests –Operating Partnership				41,072
Adjustment for Noncontrolling Interests ownership in Operating Partnership				2,425				(2,425)
PAID IN CAPITAL
Conversion of OP Units into Common Shares				57
Exercise of share options				104
Employee Share Purchase Plan (ESPP)				1,197
RETAINED EARNINGS
Net income attributable to controlling interests	91,286				91,286
Common Share distributions					(224,269)
Preferred Share distributions					(773)
Accumulated other comprehensive income (loss) - derivative instruments:
Losses reclassified into earnings from other comprehensive income	(5,877)					5,877
DISTRIBUTIONS
Distributions declared per Common Share outstanding							$ 0.6025
NONCONTROLLING INTERESTS
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(57)
Equity compensation associated with Noncontrolling Interests								2,499
Net income attributable to Noncontrolling Interests	3,376							3,376	703
Distributions to Noncontrolling Interests								(7,963)	(1,043)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership								1,917
Adjustment for Noncontrolling Interests ownership in Operating Partnership				2,425				(2,425)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	3,376							3,376	703
Contributions by Noncontrolling Interests									76
Distributions to Noncontrolling Interests								(7,963)	(1,043)
Balance, end of period at Sep. 30, 2020	10,517,480	$ 37,280	$ 3,722	$ 9,166,018	$ 1,371,938	$ (61,478)
Balance, end of period at Sep. 30, 2020	$ 236,886							$ 232,516	$ 4,370

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
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 (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
ASSETS
Land	$ 5,794,771	$ 5,936,188
Depreciable property	21,076,222	21,319,101
Projects under development	337,696	181,630
Land held for development	103,900	96,688
Investment in real estate	27,312,589	27,533,607
Accumulated depreciation	(7,738,318)	(7,276,786)
Investment in real estate, net	19,574,271	20,256,821
Investments in unconsolidated entities	54,828	52,238
Cash and cash equivalents	178,333	45,753
Restricted deposits	56,881	71,246
Right-of-use assets	502,184	512,774
Other assets	257,481	233,937
Total assets	20,623,978	21,172,769
Liabilities:
Mortgage notes payable, net	2,313,833	1,941,610
Notes, net	6,082,897	6,077,513
Line of credit and commercial paper		1,017,833
Accounts payable and accrued expenses	158,611	94,350
Accrued interest payable	65,669	66,852
Lease liabilities	329,684	331,334
Other liabilities	331,522	346,963
Security deposits	61,453	70,062
Distributions payable	232,237	218,326
Total liabilities	9,575,906	10,164,843
Commitments and contingencies
Redeemable Limited Partners	293,706	463,400
Partners’ Capital:
Accumulated other comprehensive income (loss)	(61,478)	(77,563)
Noncontrolling Interests – Partially Owned Properties	4,370	1,183
Total liabilities and equity/capital	20,623,978	21,172,769
ERPOP [Member]
ASSETS
Land	5,794,771	5,936,188
Depreciable property	21,076,222	21,319,101
Projects under development	337,696	181,630
Land held for development	103,900	96,688
Investment in real estate	27,312,589	27,533,607
Accumulated depreciation	(7,738,318)	(7,276,786)
Investment in real estate, net	19,574,271	20,256,821
Investments in unconsolidated entities	54,828	52,238
Cash and cash equivalents	178,333	45,753
Restricted deposits	56,881	71,246
Right-of-use assets	502,184	512,774
Other assets	257,481	233,937
Total assets	20,623,978	21,172,769
Liabilities:
Mortgage notes payable, net	2,313,833	1,941,610
Notes, net	6,082,897	6,077,513
Line of credit and commercial paper		1,017,833
Accounts payable and accrued expenses	158,611	94,350
Accrued interest payable	65,669	66,852
Lease liabilities	329,684	331,334
Other liabilities	331,522	346,963
Security deposits	61,453	70,062
Distributions payable	232,237	218,326
Total liabilities	9,575,906	10,164,843
Commitments and contingencies
Redeemable Limited Partners	293,706	463,400
Partners’ Capital:
Preference Units	37,280	37,280
General Partner	10,541,678	10,355,789
Limited Partners	232,516	227,837
Accumulated other comprehensive income (loss)	(61,478)	(77,563)
Total partners’ capital	10,749,996	10,543,343
Noncontrolling Interests – Partially Owned Properties	4,370	1,183
Total capital	10,754,366	10,544,526
Total liabilities and equity/capital	$ 20,623,978	$ 21,172,769

CONSOLIDATED STATEMENTS OF OP_2

CONSOLIDATED STATEMENTS OF OPERATIONS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
REVENUES
Rental income	$ 622,433	$ 685,120	$ 1,958,270	$ 2,016,796
EXPENSES
Property and maintenance	113,065	114,966	333,333	338,497
Real estate taxes and insurance	95,273	87,546	288,043	270,434
Property management	20,196	21,940	71,513	72,705
General and administrative	10,859	11,417	37,212	41,127
Depreciation	200,605	211,478	619,003	616,201
Total expenses	439,998	447,347	1,349,104	1,338,964
Net gain (loss) on sales of real estate properties	(25)	130,565	352,218	269,400
Operating income	182,410	368,338	961,384	947,232
Interest and other income	535	656	4,006	2,581
Other expenses	(4,097)	(2,813)	(8,324)	(11,205)
Interest:
Expense incurred, net	(80,874)	(85,936)	(248,349)	(289,776)
Amortization of deferred financing costs	(2,101)	(2,881)	(6,253)	(8,664)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	95,873	277,364	702,464	640,168
Income and other tax (expense) benefit	(262)	(265)	(502)	(749)
Income (loss) from investments in unconsolidated entities	(246)	(1,152)	(2,445)	66,906
Net gain (loss) on sales of land parcels		1,899		2,077
Net income	95,365	277,846	699,517	708,402
Partially Owned Properties	(703)	(830)	(14,113)	(2,450)
Net income attributable to controlling interests	$ 91,286	$ 267,106	$ 660,780	$ 680,613
Earnings per Unit – basic:
Net income available to Units	$ 0.24	$ 0.72	$ 1.77	$ 1.83
Earnings per Unit – diluted:
Net income available to Units	$ 0.24	$ 0.71	$ 1.77	$ 1.82
Weighted average Units outstanding	385,652	386,896	385,973	386,177
ERPOP [Member]
REVENUES
Rental income	$ 622,433	$ 685,120	$ 1,958,270	$ 2,016,796
EXPENSES
Property and maintenance	113,065	114,966	333,333	338,497
Real estate taxes and insurance	95,273	87,546	288,043	270,434
Property management	20,196	21,940	71,513	72,705
General and administrative	10,859	11,417	37,212	41,127
Depreciation	200,605	211,478	619,003	616,201
Total expenses	439,998	447,347	1,349,104	1,338,964
Net gain (loss) on sales of real estate properties	(25)	130,565	352,218	269,400
Operating income	182,410	368,338	961,384	947,232
Interest and other income	535	656	4,006	2,581
Other expenses	(4,097)	(2,813)	(8,324)	(11,205)
Interest:
Expense incurred, net	(80,874)	(85,936)	(248,349)	(289,776)
Amortization of deferred financing costs	(2,101)	(2,881)	(6,253)	(8,664)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	95,873	277,364	702,464	640,168
Income and other tax (expense) benefit	(262)	(265)	(502)	(749)
Income (loss) from investments in unconsolidated entities	(246)	(1,152)	(2,445)	66,906
Net gain (loss) on sales of land parcels		1,899		2,077
Net income	95,365	277,846	699,517	708,402
Partially Owned Properties	(703)	(830)	(14,113)	(2,450)
Net income attributable to controlling interests	94,662	277,016	685,404	705,952
ALLOCATION OF NET INCOME:
Preference Units	773	773	2,318	2,318
General Partner	90,513	266,333	658,462	678,295
Limited Partners	3,376	9,910	24,624	25,339
Net income available to Units	$ 93,889	$ 276,243	$ 683,086	$ 703,634
Earnings per Unit – basic:
Net income available to Units	$ 0.24	$ 0.72	$ 1.77	$ 1.83
Weighted average Units outstanding	384,871	383,709	384,759	383,142
Earnings per Unit – diluted:
Net income available to Units	$ 0.24	$ 0.71	$ 1.77	$ 1.82
Weighted average Units outstanding	385,652	386,896	385,973	386,177

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Comprehensive income:
Net income	$ 95,365	$ 277,846	$ 699,517	$ 708,402
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the period			(1,190)	(33,765)
Losses reclassified into earnings from other comprehensive income	5,877	5,757	17,275	14,659
Other comprehensive income (loss)	5,877	5,757	16,085	(19,106)
Comprehensive income	101,242	283,603	715,602	689,296
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(4,290)	(10,946)	(39,316)	(27,096)
Comprehensive income attributable to controlling interests	96,952	272,657	676,286	662,200
ERPOP [Member]
Comprehensive income:
Net income	95,365	277,846	699,517	708,402
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the period			(1,190)	(33,765)
Losses reclassified into earnings from other comprehensive income	5,877	5,757	17,275	14,659
Other comprehensive income (loss)	5,877	5,757	16,085	(19,106)
Comprehensive income	101,242	283,603	715,602	689,296
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(703)	(830)	(14,113)	(2,450)
Comprehensive income attributable to controlling interests	$ 100,539	$ 282,773	$ 701,489	$ 686,846

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 699,517	$ 708,402
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	619,003	616,201
Amortization of deferred financing costs	6,253	8,664
Amortization of above/below market lease intangibles	(53)	(53)
Amortization of discounts and premiums on debt	3,834	10,137
Amortization of deferred settlements on derivative instruments	17,266	14,650
Amortization of right-of-use assets	8,785	9,966
Write-off of pursuit costs	4,864	4,098
(Income) loss from investments in unconsolidated entities	2,445	(66,906)
Distributions from unconsolidated entities – return on capital	100	2,486
Net (gain) loss on sales of real estate properties	(352,218)	(269,400)
Net (gain) loss on sales of land parcels		(2,077)
Net (gain) loss on debt extinguishment		3,381
Realized/unrealized (gain) loss on derivative instruments	50
Compensation paid with Company Common Shares	18,275	20,777
Other operating activities, net	1,805
Changes in assets and liabilities:
(Increase) decrease in other assets	(30,197)	(20,871)
Increase (decrease) in accounts payable and accrued expenses	54,418	57,822
Increase (decrease) in accrued interest payable	(1,183)	11,125
Increase (decrease) in lease liabilities	(1,650)	(1,784)
Increase (decrease) in other liabilities	(8,381)	(15,578)
Increase (decrease) in security deposits	(8,609)	3,140
Net cash provided by operating activities	1,034,324	1,094,180
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(48,898)	(1,147,236)
Investment in real estate – development/other	(157,778)	(137,238)
Capital expenditures to real estate	(92,123)	(128,335)
Non-real estate capital additions	(19,290)	(2,139)
Interest capitalized for real estate under development	(6,880)	(4,801)
Proceeds from disposition of real estate, net	747,600	692,649
Investments in unconsolidated entities	(6,664)	(9,073)
Distributions from unconsolidated entities – return of capital	1,000	78,262
Purchase of investment securities and other investments	(509)	(269)
Net cash provided by (used for) investing activities	416,458	(658,180)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(2,923)	(12,025)
Mortgage notes payable, net:
Proceeds	505,375	295,713
Lump sum payoffs	(127,767)	(723,021)
Scheduled principal repayments	(5,821)	(4,883)
Net gain (loss) on debt extinguishment		(3,381)
Notes, net:
Proceeds		1,194,468
Lump sum payoffs		(450,000)
Line of credit and commercial paper:
Line of credit proceeds	1,870,000	5,850,000
Line of credit repayments	(1,890,000)	(5,850,000)
Commercial paper proceeds	6,726,167	13,341,198
Commercial paper repayments	(7,724,000)	(13,486,000)
Proceeds from (payments on) settlement of derivative instruments	(1,240)	(41,616)
Proceeds from Employee Share Purchase Plan (ESPP)	3,556	2,323
Proceeds from exercise of EQR options	11,426	67,066
Payment of offering costs		(789)
Other financing activities, net	(31)	(49)
Contributions – Noncontrolling Interests – Partially Owned Properties	417	4,594
Contributions – Limited Partners	12
Distributions:
OP Units – General Partner	(659,668)	(620,391)
Preference Units	(2,318)	(2,318)
OP Units – Limited Partners	(24,440)	(22,202)
Noncontrolling Interests – Partially Owned Properties	(11,312)	(6,404)
Net cash provided by (used for) financing activities	(1,332,567)	(467,717)
Net increase (decrease) in cash and cash equivalents and restricted deposits	118,215	(31,717)
Cash and cash equivalents and restricted deposits, beginning of period	116,999	116,313
Cash and cash equivalents and restricted deposits, end of period	235,214	84,596
Cash and cash equivalents	178,333	28,777
Restricted deposits	56,881	55,819
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	223,703	246,410
Net cash paid (received) for income and other taxes	(1,092)	918
Amortization of deferred financing costs:
Investment in real estate, net	(180)	(60)
Other assets	1,755	1,808
Mortgage notes payable, net	1,337	3,529
Notes, net	3,341	3,387
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	1,791	8,017
Notes, net	2,043	2,120
Amortization of deferred settlements on derivative instruments:
Other liabilities	(9)	(9)
Accumulated other comprehensive income	17,275	14,659
Write-off of pursuit costs:
Investment in real estate, net	4,621	4,042
Other assets	219	48
Accounts payable and accrued expenses	24	8
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	1,474	(67,900)
Other liabilities	971	994
Realized/unrealized (gain) loss on derivative instruments:
Other assets		2,002
Notes, net		2,277
Other liabilities	1,240	29,486
Accumulated other comprehensive income	(1,190)	(33,765)
Investments in unconsolidated entities:
Investments in unconsolidated entities	(5,164)	(6,973)
Other liabilities	(1,500)	(2,100)
Debt financing costs:
Other assets	(231)	145
Mortgage notes payable, net	(2,692)	(2,354)
Notes, net		(10,454)
Other liabilities		638
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets		(491,010)
Other assets		184,116
Lease liabilities		335,096
Other liabilities		(28,202)
ERPOP [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	699,517	708,402
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	619,003	616,201
Amortization of deferred financing costs	6,253	8,664
Amortization of above/below market lease intangibles	(53)	(53)
Amortization of discounts and premiums on debt	3,834	10,137
Amortization of deferred settlements on derivative instruments	17,266	14,650
Amortization of right-of-use assets	8,785	9,966
Write-off of pursuit costs	4,864	4,098
(Income) loss from investments in unconsolidated entities	2,445	(66,906)
Distributions from unconsolidated entities – return on capital	100	2,486
Net (gain) loss on sales of real estate properties	(352,218)	(269,400)
Net (gain) loss on sales of land parcels		(2,077)
Net (gain) loss on debt extinguishment		3,381
Realized/unrealized (gain) loss on derivative instruments	50
Compensation paid with Company Common Shares	18,275	20,777
Other operating activities, net	1,805
Changes in assets and liabilities:
(Increase) decrease in other assets	(30,197)	(20,871)
Increase (decrease) in accounts payable and accrued expenses	54,418	57,822
Increase (decrease) in accrued interest payable	(1,183)	11,125
Increase (decrease) in lease liabilities	(1,650)	(1,784)
Increase (decrease) in other liabilities	(8,381)	(15,578)
Increase (decrease) in security deposits	(8,609)	3,140
Net cash provided by operating activities	1,034,324	1,094,180
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(48,898)	(1,147,236)
Investment in real estate – development/other	(157,778)	(137,238)
Capital expenditures to real estate	(92,123)	(128,335)
Non-real estate capital additions	(19,290)	(2,139)
Interest capitalized for real estate under development	(6,880)	(4,801)
Proceeds from disposition of real estate, net	747,600	692,649
Investments in unconsolidated entities	(6,664)	(9,073)
Distributions from unconsolidated entities – return of capital	1,000	78,262
Purchase of investment securities and other investments	(509)	(269)
Net cash provided by (used for) investing activities	416,458	(658,180)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(2,923)	(12,025)
Mortgage notes payable, net:
Proceeds	505,375	295,713
Lump sum payoffs	(127,767)	(723,021)
Scheduled principal repayments	(5,821)	(4,883)
Notes, net:
Proceeds		1,194,468
Lump sum payoffs		(450,000)
Line of credit and commercial paper:
Line of credit proceeds	1,870,000	5,850,000
Line of credit repayments	(1,890,000)	(5,850,000)
Commercial paper proceeds	6,726,167	13,341,198
Commercial paper repayments	(7,724,000)	(13,486,000)
Proceeds from (payments on) settlement of derivative instruments	(1,240)	(41,616)
Proceeds from Employee Share Purchase Plan (ESPP)	3,556	2,323
Proceeds from exercise of EQR options	11,426	67,066
Payment of offering costs		(789)
Other financing activities, net	(31)	(49)
Contributions – Noncontrolling Interests – Partially Owned Properties	417	4,594
Contributions – Limited Partners	12
Distributions:
OP Units – General Partner	(659,668)	(620,391)
Preference Units	(2,318)	(2,318)
OP Units – Limited Partners	(24,440)	(22,202)
Noncontrolling Interests – Partially Owned Properties	(11,312)	(6,404)
Net cash provided by (used for) financing activities	(1,332,567)	(467,717)
Net increase (decrease) in cash and cash equivalents and restricted deposits	118,215	(31,717)
Cash and cash equivalents and restricted deposits, beginning of period	116,999	116,313
Cash and cash equivalents and restricted deposits, end of period	235,214	84,596
Cash and cash equivalents	178,333	28,777
Restricted deposits	56,881	55,819
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	223,703	246,410
Net cash paid (received) for income and other taxes	(1,092)	918
Amortization of deferred financing costs:
Investment in real estate, net	(180)	(60)
Other assets	1,755	1,808
Mortgage notes payable, net	1,337	3,529
Notes, net	3,341	3,387
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	1,791	8,017
Notes, net	2,043	2,120
Amortization of deferred settlements on derivative instruments:
Other liabilities	(9)	(9)
Accumulated other comprehensive income	17,275	14,659
Write-off of pursuit costs:
Investment in real estate, net	4,621	4,042
Other assets	219	48
Accounts payable and accrued expenses	24	8
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	1,474	(67,900)
Other liabilities	971	994
Realized/unrealized (gain) loss on derivative instruments:
Other assets		2,002
Notes, net		2,277
Other liabilities	1,240	29,486
Accumulated other comprehensive income	(1,190)	(33,765)
Investments in unconsolidated entities:
Investments in unconsolidated entities	(5,164)	(6,973)
Other liabilities	(1,500)	(2,100)
Debt financing costs:
Other assets	(231)	145
Mortgage notes payable, net	$ (2,692)	(2,354)
Notes, net		(10,454)
Other liabilities		638
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets		(491,010)
Other assets		184,116
Lease liabilities		335,096
Other liabilities		(28,202)
ERPOP [Member] | Mortgage Notes Payable, Net [Member]
Mortgage notes payable, net:
Net gain (loss) on debt extinguishment		$ (3,381)

CONSOLIDATED STATEMENTS OF CH_3

CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	Total	ERPOP [Member]	PREFERRED SHARESERPOP [Member]	General Partner [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, 2018			$ 37,280		$ 10,200,910	$ 228,738	$ (64,986)
Balance, beginning of year at Dec. 31, 2018									$ (2,293)
OP Unit Issuance:
Conversion of OP Units held by Limited Partners into OP Units held by General Partner					9,843	(9,843)
Exercise of EQR share options					67,066
EQR's Employee Share Purchase Plan (ESPP)				$ 2,323
Share-based employee compensation expense:
EQR restricted shares					10,304
EQR share options					2,185
EQR ESPP discount					502
Net income available to Units - General Partner		$ 678,295			678,295
OP Units General Partner distributions					(631,635)
Offering costs					(789)
Supplemental Executive Retirement Plan (SERP)					(1,539)
Change in market value of Redeemable Limited Partners					(114,936)
Adjustment for Limited Partners ownership in Operating Partnership					6,919	(6,919)
LIMITED PARTNERS
Conversion of OP Units held by Limited Partners into OP Units held by General Partner					9,843	(9,843)
Equity compensation associated with Units - Limited Partners						12,200
Net income available to Units - Limited Partners		25,339				25,339
Units - Limited Partners distributions						(22,493)
Change in carrying value of Redeemable Limited Partners						(957)
Adjustment for Limited Partners ownership in Operating Partnership					6,919	(6,919)
Accumulated other comprehensive income (loss) - derivative instruments:
Unrealized holding gains (losses) arising during the period	$ (33,765)	(33,765)					(33,765)
Losses reclassified into earnings from other comprehensive income	(14,659)	(14,659)					14,659
DISTRIBUTIONS
Distributions declared per Unit outstanding								$ 1.7025
NONCONTROLLING INTERESTS – PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	708,402	708,402
Contributions by Noncontrolling Interests									4,594
Distributions to Noncontrolling Interests									(6,453)
Net income attributable to Noncontrolling Interests	2,450	2,450							2,450
Balance, end of period at Sep. 30, 2019			37,280		10,229,448	226,065	(84,092)
Balance, end of period at Sep. 30, 2019									(1,702)
Balance, beginning of year at Jun. 30, 2019			37,280		10,206,098	227,320	(89,849)
Balance, beginning of year at Jun. 30, 2019									(1,298)
OP Unit Issuance:
Conversion of OP Units held by Limited Partners into OP Units held by General Partner					4,972	(4,972)
Exercise of EQR share options					18,579
EQR's Employee Share Purchase Plan (ESPP)				671
Share-based employee compensation expense:
EQR restricted shares					2,322
EQR share options					503
EQR ESPP discount					137
Net income available to Units - General Partner		266,333			266,333
OP Units General Partner distributions					(210,719)
Offering costs					(634)
Change in market value of Redeemable Limited Partners					(57,962)
Adjustment for Limited Partners ownership in Operating Partnership					(852)	852
LIMITED PARTNERS
Conversion of OP Units held by Limited Partners into OP Units held by General Partner					4,972	(4,972)
Equity compensation associated with Units - Limited Partners						1,371
Net income available to Units - Limited Partners		9,910				9,910
Units - Limited Partners distributions						(7,414)
Change in carrying value of Redeemable Limited Partners						(1,002)
Adjustment for Limited Partners ownership in Operating Partnership					(852)	852
Accumulated other comprehensive income (loss) - derivative instruments:
Losses reclassified into earnings from other comprehensive income	(5,757)	(5,757)					5,757
DISTRIBUTIONS
Distributions declared per Unit outstanding								0.5675
NONCONTROLLING INTERESTS – PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	277,846	277,846
Distributions to Noncontrolling Interests									(1,234)
Net income attributable to Noncontrolling Interests	830	830							830
Balance, end of period at Sep. 30, 2019			37,280		10,229,448	226,065	(84,092)
Balance, end of period at Sep. 30, 2019									(1,702)
Balance, beginning of year at Dec. 31, 2019			37,280		10,355,789	227,837	(77,563)
Balance, beginning of year at Dec. 31, 2019									1,183
OP Unit Issuance:
Conversion of OP Units held by Limited Partners into OP Units held by General Partner					3,913	(3,913)
Exercise of EQR share options					11,426
EQR's Employee Share Purchase Plan (ESPP)				3,556
Share-based employee compensation expense:
EQR restricted shares					9,238
EQR share options					1,819
EQR ESPP discount					626
Net income available to Units - General Partner		658,462			658,462
OP Units General Partner distributions					(673,019)
Supplemental Executive Retirement Plan (SERP)					(395)
Change in market value of Redeemable Limited Partners					169,825
Adjustment for Limited Partners ownership in Operating Partnership					438	(438)
LIMITED PARTNERS
Issuance of restricted units to Limited Partners						12
Conversion of OP Units held by Limited Partners into OP Units held by General Partner					3,913	(3,913)
Equity compensation associated with Units - Limited Partners						9,525
Net income available to Units - Limited Partners		24,624				24,624
Units - Limited Partners distributions						(25,000)
Change in carrying value of Redeemable Limited Partners						(131)
Adjustment for Limited Partners ownership in Operating Partnership					438	(438)
Accumulated other comprehensive income (loss) - derivative instruments:
Unrealized holding gains (losses) arising during the period	(1,190)	(1,190)					(1,190)
Losses reclassified into earnings from other comprehensive income	(17,275)	(17,275)					17,275
DISTRIBUTIONS
Distributions declared per Unit outstanding								1.8075
NONCONTROLLING INTERESTS – PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	699,517	699,517
Contributions by Noncontrolling Interests									417
Distributions to Noncontrolling Interests									(11,343)
Net income attributable to Noncontrolling Interests	14,113	14,113							14,113
Balance, end of period at Sep. 30, 2020			37,280		10,541,678	232,516	(61,478)
Balance, end of period at Sep. 30, 2020									4,370
Balance, beginning of year at Jun. 30, 2020			37,280		10,627,748	235,169	(67,355)
Balance, beginning of year at Jun. 30, 2020									4,634
OP Unit Issuance:
Conversion of OP Units held by Limited Partners into OP Units held by General Partner					57	(57)
Exercise of EQR share options					104
EQR's Employee Share Purchase Plan (ESPP)				$ 1,197
Share-based employee compensation expense:
EQR restricted shares					1,984
EQR share options					526
EQR ESPP discount					210
Net income available to Units - General Partner		90,513			90,513
OP Units General Partner distributions					(224,269)
Supplemental Executive Retirement Plan (SERP)					111
Change in market value of Redeemable Limited Partners					41,072
Adjustment for Limited Partners ownership in Operating Partnership					2,425	(2,425)
LIMITED PARTNERS
Conversion of OP Units held by Limited Partners into OP Units held by General Partner					57	(57)
Equity compensation associated with Units - Limited Partners						2,499
Net income available to Units - Limited Partners		3,376				3,376
Units - Limited Partners distributions						(7,963)
Change in carrying value of Redeemable Limited Partners						1,917
Adjustment for Limited Partners ownership in Operating Partnership					2,425	(2,425)
Accumulated other comprehensive income (loss) - derivative instruments:
Losses reclassified into earnings from other comprehensive income	(5,877)	(5,877)					5,877
DISTRIBUTIONS
Distributions declared per Unit outstanding								$ 0.6025
NONCONTROLLING INTERESTS – PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	95,365	95,365
Contributions by Noncontrolling Interests									76
Distributions to Noncontrolling Interests									(1,043)
Net income attributable to Noncontrolling Interests	$ 703	$ 703							703
Balance, end of period at Sep. 30, 2020			$ 37,280		$ 10,541,678	$ 232,516	$ (61,478)
Balance, end of period at Sep. 30, 2020									$ 4,370

Business

Business	9 Months Ended
	Sep. 30, 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. ERPOP. ERPOP. EQR is the general partner of, and as of September 30, 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 ERPOP. ERPOP, As of September 30, 2020, the Company, directly or indirectly through investments in title holding entities, owned all or a portion of 305 properties located in 9 states and the District of Columbia consisting of 78,568 apartment units. The ownership breakdown includes (table does not include various uncompleted development properties): Properties Apartment Units Wholly Owned Properties 288 75,007 Master-Leased Property – Consolidated 1 162 Partially Owned Properties – Consolidated 16 3,399 305 78,568 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 future significant impact on the Company. Its duration, severity and the extent of the adverse health impact on the general population, our residents and employees, and the potential 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	9 Months Ended
	Sep. 30, 2020
Summary Of Significant Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) and certain reclassifications considered necessary for a fair presentation have been included. Operating results for the nine months ended September 30, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020. 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 (see discussion below) and impairment, require d revised approaches and generally concluded that no revisions were necessary at this time . The balance sheets at December 31, 2019 have been derived from the audited financial statements at that date but do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. For further information, including definitions of capitalized terms not defined herein, refer to the consolidated financial statements and footnotes thereto included in the Company’s and the Operating Partnership’s Annual Report on Form 10-K for the year ended December 31, 2019. 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. While we do not expect these provisions to result in a material impact to the Company’s taxable income or tax liabilities, the Company will continue to analyze the provisions of the CARES Act and related guidance as it is published. The CARES Act also allows 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 quarter ended September 30, 2020. 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 June 2016, the FASB In 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. The Company also elected the practical expedient to account for both its lease and non-lease components as a single component under the leases standard. 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.

Equity, Capital and Other Inter

Equity, Capital and Other Interests	9 Months Ended
	Sep. 30, 2020
Equity Capital And Other Interests [Abstract]
Equity, Capital and Other Interests	3. Equity, Capital and Other 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 nine months ended September 30, 2020 and 2019: 2020 2019 Common Shares Common Shares outstanding at January 1, 371,670,884 369,405,161 Common Shares Issued: Conversion of OP Units 99,737 294,400 Exercise of share options 219,922 1,430,048 Employee Share Purchase Plan (ESPP) 69,986 37,263 Restricted share grants, net 178,720 160,460 Common Shares outstanding at September 30, 372,239,249 371,327,332 Units Units outstanding at January 1, 13,731,315 13,904,035 Restricted unit grants, net 247,822 140,055 Conversion of OP Units to Common Shares (99,737 ) (294,400 ) Units outstanding at September 30, 13,879,400 13,749,690 Total Common Shares and Units outstanding at September 30, 386,118,649 385,077,022 Units Ownership Interest in Operating Partnership 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 nine months ended September 30, 2020 and 2019: 2020 2019 General and Limited Partner Units General and Limited Partner Units outstanding at January 1, 385,402,199 383,309,196 Issued to General Partner: Exercise of EQR share options 219,922 1,430,048 EQR’s Employee Share Purchase Plan (ESPP) 69,986 37,263 EQR’s restricted share grants, net 178,720 160,460 Issued to Limited Partners: Restricted unit grants, net 247,822 140,055 General and Limited Partner Units outstanding at September 30, 386,118,649 385,077,022 Limited Partner Units Limited Partner Units outstanding at January 1, 13,731,315 13,904,035 Limited Partner restricted unit grants, net 247,822 140,055 Conversion of Limited Partner OP Units to EQR Common Shares (99,737 ) (294,400 ) Limited Partner Units outstanding at September 30, 13,879,400 13,749,690 Limited Partner Units Ownership Interest in Operating Partnership 3.6 % 3.6 % The equity positions of various individuals and entities that contributed their properties to the Operating Partnership in exchange for OP Units, as well as the equity positions of the holders of restricted units, are collectively referred to as the “Noncontrolling Interests – Operating Partnership” and “Limited Partners Capital,” respectively, for the Company and the Operating Partnership. Subject to certain exceptions (including the “book-up” requirements of restricted units), the Noncontrolling Interests – Operating Partnership/Limited Partners Capital may exchange their Units with EQR for Common Shares on a one-for-one basis. The carrying value of the Noncontrolling Interests – Operating Partnership/Limited Partners Capital (including redeemable interests) is allocated based on the number of Noncontrolling Interests – Operating Partnership/Limited Partners Capital in total in proportion to the number of Noncontrolling Interests – Operating Partnership/Limited Partners Capital in total plus the total number of Common Shares/General Partner Units. Net income is allocated to the Noncontrolling Interests – Operating Partnership/Limited Partners Capital based on the weighted average ownership percentage during the period. The Operating Partnership has the right but not the obligation to make a cash payment instead of issuing Common Shares to any and all holders of Noncontrolling 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 September 30, 2020 and December 31, 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 September 30, 2020 and 2019, the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners have a redemption value of approximately The following table presents the changes in the redemption value of the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners for the nine months ended September 30, 2020 and 2019 (amounts in 2020 2019 Balance at January 1, $ 463,400 $ 379,106 Change in market value (169,825 ) 114,936 Change in carrying value 131 957 Balance at September 30, $ 293,706 $ 494,999 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 100,000,000 The following table presents the Company’s issued and outstanding Preferred Shares/Preference Units as December 31, 2019 Amounts in thousands Annual Call Dividend Per September 30, 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% Units; liquidation value $50 per share/unit; 745,600 shares/units issued and outstanding as of September 30, 2020 and December 31, 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 September 30, 2020, EQR has remaining authorization to repurchase up to 13.0 million of its shares.

Real Estate

Real Estate	9 Months Ended
	Sep. 30, 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 September 30, 2020 and December 31, 2019 (amounts in thousands): September 30, 2020 December 31, 2019 Land $ 5,794,771 $ 5,936,188 Depreciable property: Buildings and improvements 18,626,029 18,904,686 Furniture, fixtures and equipment 1,962,223 1,916,458 In-Place lease intangibles 487,970 497,957 Projects under development: Land 23,531 23,531 Construction-in-progress 314,165 158,099 Land held for development: Land 64,490 64,460 Construction-in-progress 39,410 32,228 Investment in real estate 27,312,589 27,533,607 Accumulated depreciation (7,738,318 ) (7,276,786 ) Investment in real estate, net $ 19,574,271 $ 20,256,821 During the nine months ended September 30, 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 nine months ended September 30, 2020, the Company disposed of the following to unaffiliated parties (sales price in thousands): Properties Apartment Units Sales Price Rental Properties – Consolidated 5 1,552 $ 754,361 Total 5 1,552 $ 754,361 The Company recognized a net gain on sales of real estate properties of approximately $352.2 million on the above sales.

Commitments to Acquire_Dispose

Commitments to Acquire/Dispose of Real Estate	9 Months Ended
	Sep. 30, 2020
Commitments To Acquire Dispose Of Real Estate [Abstract]
Commitments to Acquire/Dispose of Real Estate	5. Commitments to Acquire/Dispose of Real The Company has not entered into any agreements to acquire rental properties or land parcels as of the date of filing. The Company has entered into separate agreements to dispose of the following (sales price and net book value in thousands): Properties Apartment Units Sales Price Net Book Value Land Parcels (two) — — $ 55,710 $ 19,475 Total — — $ 55,710 $ 19,475 The closing of pending transactions is subject to certain conditions and restrictions; therefore, there can be no assurance that the transactions will be consummated or that the final terms will not differ in material respects from any agreements summarized above. See Note 14 for discussion of the properties acquired or disposed of, if any, subsequent to September 30, 2020.

Investments in Partially Owned

Investments in Partially Owned Entities	9 Months Ended
	Sep. 30, 2020
Investments In Partially Owned Entities [Abstract]
Investments in Partially Owned Entities	6. Investments in Partially Owned The Consolidated Variable Interest Entities (“VIEs”) In accordance with accounting standards for consolidation of VIEs , the 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 entered into 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 $764.2 million and $210.2 million, respectively, at September 30, 2020 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 September 30, 2020 and December 31, 2019 September 30, 2020 December 31, 2019 Ownership Percentage Investments in Unconsolidated Entities: Operating Property (VIE) (1) $ 38,820 $ 40,361 33.3% Real Estate Technology (2) 16,246 12,318 Varies Other (238 ) (441 ) Varies Investments in Unconsolidated Entities $ 54,828 $ 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	9 Months Ended
	Sep. 30, 2020
Deposits Restricted [Abstract]
Restricted Deposits	7. Restricted Deposits The following table presents the Company’s restricted deposits as of September 30, 2020 and December 31, 2019 (amounts in thousands): September 30, 2020 December 31, 2019 Mortgage escrow deposits: Replacement reserves $ 9,558 $ 8,543 Mortgage principal reserves/sinking funds 13,013 9,689 Mortgage escrow deposits 22,571 18,232 Restricted cash: Tax-deferred (1031) exchange proceeds — 14,232 Restricted deposits on real estate investments 722 658 Resident security and utility deposits 32,215 37,140 Other 1,373 984 Restricted cash 34,310 53,014 Restricted deposits $ 56,881 $ 71,246

Leases

Leases	9 Months Ended
	Sep. 30, 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 standard as described in Note 2. For the nine months ended September 30, 2020, approximately 98% 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 nine months ended September 30, 2020, approximately 2% 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 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 nine months ended September 30, 2020 and 2019 (amounts in thousands): Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 Income Type Residential Leases Non-Residential Leases Total Residential Leases Non-Residential Leases Total Residential and non-residential rent $ 1,783,298 $ 36,263 $ 1,819,561 $ 1,801,749 $ 54,616 $ 1,856,365 Utility recoveries (RUBS income) (1) 52,538 509 53,047 50,290 650 50,940 Parking rent 29,052 324 29,376 27,874 259 28,133 Storage rent 2,814 60 2,874 2,796 51 2,847 Pet rent 8,583 — 8,583 8,714 — 8,714 Total lease revenue $ 1,876,285 $ 37,156 1,913,441 $ 1,891,423 $ 55,576 1,946,999 Total other rental income (2) 44,829 69,797 Rental income $ 1,958,270 $ 2,016,796 (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 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 quarters ended September 30, 2020 and 2019 (amounts in thousands): Quarter Ended September 30, 2020 Quarter Ended September 30, 2019 Income Type Residential Leases Non-Residential Leases Total Residential Leases Non-Residential Leases Total Residential and non-residential rent $ 576,192 $ 6,042 $ 582,234 $ 611,020 $ 18,453 $ 629,473 Utility recoveries (RUBS income) (1) 17,306 134 17,440 16,987 238 17,225 Parking rent 9,592 101 9,693 9,405 100 9,505 Storage rent 901 20 921 940 19 959 Pet rent 2,843 — 2,843 2,916 — 2,916 Total lease revenue $ 606,834 $ 6,297 613,131 $ 641,268 $ 18,810 660,078 Total other rental income (2) 9,302 25,042 Rental income $ 622,433 $ 685,120 (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 September 30, 2020 and December 31, 2019 (amounts in thousands): Residential Non-Residential Balance Sheet (Other assets): September 30, 2020 December 31, 2019 September 30, 2020 December 31, 2019 Resident/tenant accounts receivable balances $ 24,298 $ 4,040 $ 7,839 $ 1,766 Allowance for doubtful accounts (16,286 ) (1,190 ) (6,595 ) (1,412 ) Net receivable balances $ 8,012 (1) $ 2,850 $ 1,244 $ 354 Straight-line receivable balances $ 11,618 $ 1,841 $ 13,816 $ 26,450 (1) The Company held residential security deposits approximating 31.3% of the net receivable balance at September 30, 2020. The following table presents residential bad debt for the Company’s properties for the nine months ended September 30, 2020 and 2019 (amounts in thousands): Nine Months Ended September 30, Income Statement (Rental income): 2020 2019 Bad debt, net $ 29,419 $ 9,021 % of rental income 1.5 % 0.5 % Due to the impact of COVID-19 and the resulting economic impact on our non-residential tenants, we recognized a non-cash write-off of non-residential straight-line lease receivables of $12.9 million during the nine months ended September 30, 2020.

Debt

Debt	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Debt	9 . Debt EQR Mortgage Notes Payable The following table summarizes the Company’s mortgage notes payable activity for the nine months ended September 30, 2020 (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 September 30, 2020 Fixed Rate Debt: Secured – Conventional $ 1,574,699 $ 495,000 (2) $ (127,767 ) $ (5,821 ) $ 858 $ (1,683 ) $ 1,935,286 Floating Rate Debt: Secured – Conventional 7,050 10,375 — — — 180 17,605 Secured – Tax Exempt 359,861 — — — 933 148 360,942 Floating Rate Debt 366,911 10,375 — — 933 328 378,547 Total $ 1,941,610 $ 505,375 $ (127,767 ) $ (5,821 ) $ 1,791 $ (1,355 ) $ 2,313,833 (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. The following table summarizes the Company’s debt extinguishment costs on mortgages recorded as additional interest expense during the nine months ended September 30, 2020 (amounts in thousands): Description Amount Write-offs of unamortized deferred financing costs $ 37 The following table summarizes certain interest rate and maturity date information as of and for the nine months ended September 30, 2020: September 30, 2020 Interest Rate Ranges 0.10% - 4.88% Weighted Average Interest Rate 3.39% Maturity Date Ranges 2021-2061 As of September 30, 2020, the Company had $281.7 million of secured debt (primarily tax-exempt bonds) subject to third party credit enhancement. Notes The following table summarizes the Company’s notes activity for the nine months ended September 30, 2020 (amounts in thousands): Notes, net as of December 31, 2019 Proceeds Lump sum payoffs Amortization of premiums/ discounts Amortization of deferred financing costs, net (1) Notes, net as of September 30, 2020 Fixed Rate Debt: Unsecured – Public $ 6,077,513 $ — $ — $ 2,043 $ 3,341 $ 6,082,897 (1) Represents amortization of deferred financing costs, net of debt financing costs. The following table summarizes certain interest rate and maturity date information as of and for the nine months ended September 30, 2020: September 30, 2020 Interest Rate Ranges 2.50% - 7.57% Weighted Average Interest Rate 4.04% Maturity Date Ranges 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 the nine months ended September 30, 2020. 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 0.125%). Both the spread and the facility fee are dependent on the Company’s senior unsecured credit rating. The weighted average interest rate on the revolving credit facility was 1.47% for the nine months ended September 30, 2020. The Company has an unsecured commercial paper note program in the United States. On November 4, 2019, the Company increased the maximum aggregate amount outstanding for the commercial paper program from $500.0 million to $1.0 billion. The notes will be sold under customary terms in the United States commercial paper note market subject to market conditions and will rank pari passu with all of the Company’s other unsecured senior indebtedness. The notes bear interest at various floating rates with a weighted average interest rate of 1.81% for the nine months ended September 30, 2020. The weighted average amount outstanding for the nine months ended September 30, 2020 was approximately $347.2 million. 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 September 30, 2020 (amounts in thousands): September 30, 2020 Unsecured revolving credit facility commitment $ 2,500,000 Commercial paper balance outstanding — Unsecured revolving credit facility balance outstanding — Other restricted amounts (100,949 ) Unsecured revolving credit facility availability $ 2,399,051

Derivative and Other Fair Value

Derivative and Other Fair Value Instruments	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Derivative and Other Fair Value Instruments	10 . Derivative and Other Fair Value 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 • 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 The Company’s derivative positions are valued using models developed by the respective counterparty as well as models applied internally by the Company that use as their inputs readily observable market parameters (such as forward yield curves and credit default swap data). Employee holdings other than Common Shares within the supplemental executive retirement plan (the “SERP”) are valued using quoted market prices for identical assets and are included in other assets and other liabilities on the consolidated balance sheets. Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners are valued using the quoted market price of Common Shares. The fair values disclosed for mortgage notes payable and unsecured debt (including its commercial paper and line of credit, if applicable) were calculated using indicative rates provided by lenders of similar loans in the case of mortgage notes payable and the private unsecured debt (including its commercial paper and line of credit, if applicable) and quoted market prices for each underlying issuance in the case of the public unsecured notes. The fair values of the Company’s financial instruments (other than mortgage notes payable, unsecured notes, commercial paper, line of credit and derivative instruments), including cash and cash equivalents and other financial instruments, approximate their carrying or contract value. The September 30, 2020 December 31, 2019 Carrying Value Estimated Fair Value (Level 2) Carrying Value Estimated Fair Value (Level 2) Mortgage notes payable, net $ 2,313,833 $ 2,346,248 $ 1,941,610 $ 1,930,710 Unsecured debt, net 6,082,897 6,990,690 7,095,346 7,677,289 Total debt, net $ 8,396,730 $ 9,336,938 $ 9,036,956 $ 9,607,999 The Fair Value Measurements at Reporting Date Using Description Balance Sheet Location 9/30/2020 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 $ 146,679 $ 146,679 $ — $ — Liabilities Supplemental Executive Retirement Plan Other Liabilities $ 146,679 $ 146,679 $ — $ — Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Mezzanine $ 293,706 $ — $ 293,706 $ — 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 September 30, 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 $ — $ — September 30, 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 ) The Effective Portion September 30, 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 $ (17,275 ) Total $ (1,190 ) $ (17,275 ) Effective Portion September 30, 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 $ (14,659 ) Total $ (33,765 ) $ (14,659 ) As September 30, 2020 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

Earnings Per Share and Earnings

Earnings Per Share and Earnings Per Unit	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Earnings Per Share And Earnings Per Unit	1 1 . Earnings Per Share and Earnings Per Equity Residential The Nine Months Ended September 30, Quarter Ended September 30, 2020 2019 2020 2019 Numerator for net income per share – basic: Net income $ 699,517 $ 708,402 $ 95,365 $ 277,846 Allocation to Noncontrolling Interests – Operating Partnership (24,624 ) (25,339 ) (3,376 ) (9,910 ) Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (14,113 ) (2,450 ) (703 ) (830 ) Preferred distributions (2,318 ) (2,318 ) (773 ) (773 ) Numerator for net income per share – basic $ 658,462 $ 678,295 $ 90,513 $ 266,333 Numerator for net income per share – diluted: Net income $ 699,517 $ 708,402 $ 95,365 $ 277,846 Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (14,113 ) (2,450 ) (703 ) (830 ) Preferred distributions (2,318 ) (2,318 ) (773 ) (773 ) Numerator for net income per share – diluted $ 683,086 $ 703,634 $ 93,889 $ 276,243 Denominator for net income per share – basic and diluted: Denominator for net income per share – basic 371,749 370,227 371,869 370,768 Effect of dilutive securities: OP Units 13,010 12,915 13,002 12,941 Long-term compensation shares/units 1,214 3,035 781 3,187 Denominator for net income per share – diluted 385,973 386,177 385,652 386,896 Net income per share – basic $ 1.77 $ 1.83 $ 0.24 $ 0.72 Net income per share – diluted $ 1.77 $ 1.82 $ 0.24 $ 0.71 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): Nine Months Ended September 30, Quarter Ended September 30, 2020 2019 2020 2019 Numerator for net income per Unit – basic and diluted: Net income $ 699,517 $ 708,402 $ 95,365 $ 277,846 Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (14,113 ) (2,450 ) (703 ) (830 ) Allocation to Preference Units (2,318 ) (2,318 ) (773 ) (773 ) Numerator for net income per Unit – basic and diluted $ 683,086 $ 703,634 $ 93,889 $ 276,243 Denominator for net income per Unit – basic and diluted: Denominator for net income per Unit – basic 384,759 383,142 384,871 383,709 Effect of dilutive securities: Dilution for Units issuable upon assumed exercise/vesting of the Company’s long-term compensation shares/units 1,214 3,035 781 3,187 Denominator for net income per Unit – diluted 385,973 386,177 385,652 386,896 Net income per Unit – basic $ 1.77 $ 1.83 $ 0.24 $ 0.72 Net income per Unit – diluted $ 1.77 $ 1.82 $ 0.24 $ 0.71

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2020
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	1 2 . 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 September 30, 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 $265.1 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 nine months ended September 30, 2020. As of September 30, 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.

Reportable Segments

Reportable Segments	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Reportable Segments	1 3 . Reportable 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 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% 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 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 The primary financial measure for the Company’s rental real estate segment is net operating income (“NOI”), which represents The Nine Months Ended September 30, Quarter Ended September 30, 2020 2019 2020 2019 Rental income $ 1,958,270 $ 2,016,796 $ 622,433 $ 685,120 Property and maintenance expense (333,333 ) (338,497 ) (113,065 ) (114,966 ) Real estate taxes and insurance expense (288,043 ) (270,434 ) (95,273 ) (87,546 ) Total operating expenses (621,376 ) (608,931 ) (208,338 ) (202,512 ) Net operating income $ 1,336,894 $ 1,407,865 $ 414,095 $ 482,608 The following tables present NOI for each segment from our rental real estate for the nine months and quarters ended September 30, 2020 and 2019, respectively, as well as total assets and capital expenditures at September 30, 2020 (amounts in thousands): Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 Rental Income Operating Expenses NOI Rental Income Operating Expenses NOI Same store (1) Los Angeles $ 355,122 $ 108,953 $ 246,169 $ 363,258 $ 108,606 $ 254,652 Orange County 79,241 18,702 60,539 78,522 18,493 60,029 San Diego 71,430 18,776 52,654 71,088 18,595 52,493 Subtotal - Southern California 505,793 146,431 359,362 512,868 145,694 367,174 San Francisco 346,766 89,557 257,209 354,142 87,117 267,025 Washington D.C. 294,029 90,974 203,055 295,107 90,124 204,983 New York 325,920 148,306 177,614 348,190 144,197 203,993 Seattle 186,030 54,125 131,905 188,093 51,884 136,209 Boston 182,502 53,603 128,899 188,710 53,478 135,232 Denver 13,343 3,711 9,632 13,710 3,576 10,134 Total same store 1,854,383 586,707 1,267,676 1,900,820 576,070 1,324,750 Non-same store/other (2) (3) Non-same store 87,404 27,122 60,282 33,683 10,351 23,332 Other (3) 16,483 7,547 8,936 82,293 22,510 59,783 Total non-same store/other 103,887 34,669 69,218 115,976 32,861 83,115 Totals $ 1,958,270 $ 621,376 $ 1,336,894 $ 2,016,796 $ 608,931 $ 1,407,865 (1) For the nine months ended September 30, 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 74,264 apartment (2) For the nine months ended September 30, 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, (3) Other includes development, other corporate operations and operations prior to disposition for properties sold. Quarter Ended September 30, 2020 Quarter Ended September 30, 2019 Rental Income Operating Expenses NOI Rental Income Operating Expenses NOI Same store (1) Los Angeles $ 115,208 $ 37,023 $ 78,185 $ 122,506 $ 36,461 $ 86,045 Orange County 26,229 6,535 19,694 26,635 6,351 20,284 San Diego 23,581 6,358 17,223 24,064 6,468 17,596 Subtotal - Southern California 165,018 49,916 115,102 173,205 49,280 123,925 San Francisco 113,246 31,349 81,897 122,706 30,453 92,253 Washington D.C. 99,569 32,253 67,316 101,771 31,347 70,424 New York 100,076 50,179 49,897 118,803 48,614 70,189 Seattle 60,216 19,073 41,143 65,370 17,569 47,801 Boston 58,830 18,461 40,369 64,039 17,840 46,199 Denver 6,142 1,927 4,215 6,436 1,760 4,676 Total same store 603,097 203,158 399,939 652,330 196,863 455,467 Non-same store/other (2) (3) Non-same store 19,236 6,136 13,100 9,538 2,856 6,682 Other (3) 100 (956 ) 1,056 23,252 2,793 20,459 Total non-same store/other 19,336 5,180 14,156 32,790 5,649 27,141 Totals $ 622,433 $ 208,338 $ 414,095 $ 685,120 $ 202,512 $ 482,608 (1) For the quarters ended September 30, 2020 and 2019, same store primarily includes all properties acquired or completed that were stabilized prior to July 1, 2019, less properties subsequently sold, which represented 75,596 apartment (2) For the quarters ended September 30, 2020 and 2019, non-same store primarily includes properties acquired after July 1, 2019, plus any properties in lease-up and not stabilized as of July 1, (3) Other includes development, other corporate operations and operations prior to disposition for properties sold. Nine Months Ended September 30, 2020 Total Assets Capital Expenditures Same store (1) Los Angeles $ 3,034,765 $ 17,008 Orange County 392,632 5,056 San Diego 377,663 2,834 Subtotal - Southern California 3,805,060 24,898 San Francisco 3,259,452 11,789 Washington D.C. 3,092,477 15,890 New York 3,948,417 16,571 Seattle 1,818,213 7,010 Boston 1,774,255 13,137 Denver 249,306 512 Total same store 17,947,180 89,807 Non-same store/other (2) (3) Non-same store 1,679,594 1,811 Other (3) 997,204 505 Total non-same store/other 2,676,798 2,316 Totals $ 20,623,978 $ 92,123 (1) Same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2019, less properties subsequently sold, which represented 74,264 apartment (2) Non-same store primarily includes propertie s 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

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	1 4 . Subsequent There have been no material subsequent events occurring since September 30, 2020.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2020
Summary Of Significant Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) and certain reclassifications considered necessary for a fair presentation have been included. Operating results for the nine months ended September 30, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020. 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 (see discussion below) and impairment, require d revised approaches and generally concluded that no revisions were necessary at this time . The balance sheets at December 31, 2019 have been derived from the audited financial statements at that date but do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. For further information, including definitions of capitalized terms not defined herein, refer to the consolidated financial statements and footnotes thereto included in the Company’s and the Operating Partnership’s Annual Report on Form 10-K for the year ended December 31, 2019.
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. While we do not expect these provisions to result in a material impact to the Company’s taxable income or tax liabilities, the Company will continue to analyze the provisions of the CARES Act and related guidance as it is published. The CARES Act also allows 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 quarter ended September 30, 2020.
Recently Issued and Adopted 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 June 2016, the FASB In 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. The Company also elected the practical expedient to account for both its lease and non-lease components as a single component under the leases standard. 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.

Business (Tables)

Business (Tables)	9 Months Ended
	Sep. 30, 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 288 75,007 Master-Leased Property – Consolidated 1 162 Partially Owned Properties – Consolidated 16 3,399 305 78,568

Equity, Capital and Other Int_2

Equity, Capital and Other Interests (Tables)	9 Months Ended
	Sep. 30, 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 nine months ended September 30, 2020 and 2019: 2020 2019 Common Shares Common Shares outstanding at January 1, 371,670,884 369,405,161 Common Shares Issued: Conversion of OP Units 99,737 294,400 Exercise of share options 219,922 1,430,048 Employee Share Purchase Plan (ESPP) 69,986 37,263 Restricted share grants, net 178,720 160,460 Common Shares outstanding at September 30, 372,239,249 371,327,332 Units Units outstanding at January 1, 13,731,315 13,904,035 Restricted unit grants, net 247,822 140,055 Conversion of OP Units to Common Shares (99,737 ) (294,400 ) Units outstanding at September 30, 13,879,400 13,749,690 Total Common Shares and Units outstanding at September 30, 386,118,649 385,077,022 Units Ownership Interest in Operating Partnership 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 nine months ended September 30, 2020 and 2019 (amounts in 2020 2019 Balance at January 1, $ 463,400 $ 379,106 Change in market value (169,825 ) 114,936 Change in carrying value 131 957 Balance at September 30, $ 293,706 $ 494,999
Issued and Outstanding Preferred Shares and Preference Units	The following table presents the Company’s issued and outstanding Preferred Shares/Preference Units as December 31, 2019 Amounts in thousands Annual Call Dividend Per September 30, 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% Units; liquidation value $50 per share/unit; 745,600 shares/units issued and outstanding as of September 30, 2020 and December 31, 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 nine months ended September 30, 2020 and 2019: 2020 2019 General and Limited Partner Units General and Limited Partner Units outstanding at January 1, 385,402,199 383,309,196 Issued to General Partner: Exercise of EQR share options 219,922 1,430,048 EQR’s Employee Share Purchase Plan (ESPP) 69,986 37,263 EQR’s restricted share grants, net 178,720 160,460 Issued to Limited Partners: Restricted unit grants, net 247,822 140,055 General and Limited Partner Units outstanding at September 30, 386,118,649 385,077,022 Limited Partner Units Limited Partner Units outstanding at January 1, 13,731,315 13,904,035 Limited Partner restricted unit grants, net 247,822 140,055 Conversion of Limited Partner OP Units to EQR Common Shares (99,737 ) (294,400 ) Limited Partner Units outstanding at September 30, 13,879,400 13,749,690 Limited Partner Units Ownership Interest in Operating Partnership 3.6 % 3.6 %

Real Estate (Tables)

Real Estate (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2020 and December 31, 2019 (amounts in thousands): September 30, 2020 December 31, 2019 Land $ 5,794,771 $ 5,936,188 Depreciable property: Buildings and improvements 18,626,029 18,904,686 Furniture, fixtures and equipment 1,962,223 1,916,458 In-Place lease intangibles 487,970 497,957 Projects under development: Land 23,531 23,531 Construction-in-progress 314,165 158,099 Land held for development: Land 64,490 64,460 Construction-in-progress 39,410 32,228 Investment in real estate 27,312,589 27,533,607 Accumulated depreciation (7,738,318 ) (7,276,786 ) Investment in real estate, net $ 19,574,271 $ 20,256,821
Acquired Properties From Unaffiliated Parties	During the nine months ended September 30, 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).
Disposed Properties to Unaffiliated Parties	During the nine months ended September 30, 2020, the Company disposed of the following to unaffiliated parties (sales price in thousands): Properties Apartment Units Sales Price Rental Properties – Consolidated 5 1,552 $ 754,361 Total 5 1,552 $ 754,361

Commitments to Acquire_Dispos_2

Commitments to Acquire/Dispose of Real Estate (Tables)	9 Months Ended
	Sep. 30, 2020
Commitments To Acquire Dispose Of Real Estate [Abstract]
Separate Agreements to Dispose	The Company has entered into separate agreements to dispose of the following (sales price and net book value in thousands): Properties Apartment Units Sales Price Net Book Value Land Parcels (two) — — $ 55,710 $ 19,475 Total — — $ 55,710 $ 19,475

Investments in Partially Owne_2

Investments in Partially Owned Entities (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2020 and December 31, 2019 September 30, 2020 December 31, 2019 Ownership Percentage Investments in Unconsolidated Entities: Operating Property (VIE) (1) $ 38,820 $ 40,361 33.3% Real Estate Technology (2) 16,246 12,318 Varies Other (238 ) (441 ) Varies Investments in Unconsolidated Entities $ 54,828 $ 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)	9 Months Ended
	Sep. 30, 2020
Deposits Restricted [Abstract]
Restricted Deposits	The following table presents the Company’s restricted deposits as of September 30, 2020 and December 31, 2019 (amounts in thousands): September 30, 2020 December 31, 2019 Mortgage escrow deposits: Replacement reserves $ 9,558 $ 8,543 Mortgage principal reserves/sinking funds 13,013 9,689 Mortgage escrow deposits 22,571 18,232 Restricted cash: Tax-deferred (1031) exchange proceeds — 14,232 Restricted deposits on real estate investments 722 658 Resident security and utility deposits 32,215 37,140 Other 1,373 984 Restricted cash 34,310 53,014 Restricted deposits $ 56,881 $ 71,246

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Summary of Lease Income Types Relating to Lease Payments along with 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 nine months ended September 30, 2020 and 2019 (amounts in thousands): Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 Income Type Residential Leases Non-Residential Leases Total Residential Leases Non-Residential Leases Total Residential and non-residential rent $ 1,783,298 $ 36,263 $ 1,819,561 $ 1,801,749 $ 54,616 $ 1,856,365 Utility recoveries (RUBS income) (1) 52,538 509 53,047 50,290 650 50,940 Parking rent 29,052 324 29,376 27,874 259 28,133 Storage rent 2,814 60 2,874 2,796 51 2,847 Pet rent 8,583 — 8,583 8,714 — 8,714 Total lease revenue $ 1,876,285 $ 37,156 1,913,441 $ 1,891,423 $ 55,576 1,946,999 Total other rental income (2) 44,829 69,797 Rental income $ 1,958,270 $ 2,016,796 (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 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 quarters ended September 30, 2020 and 2019 (amounts in thousands): Quarter Ended September 30, 2020 Quarter Ended September 30, 2019 Income Type Residential Leases Non-Residential Leases Total Residential Leases Non-Residential Leases Total Residential and non-residential rent $ 576,192 $ 6,042 $ 582,234 $ 611,020 $ 18,453 $ 629,473 Utility recoveries (RUBS income) (1) 17,306 134 17,440 16,987 238 17,225 Parking rent 9,592 101 9,693 9,405 100 9,505 Storage rent 901 20 921 940 19 959 Pet rent 2,843 — 2,843 2,916 — 2,916 Total lease revenue $ 606,834 $ 6,297 613,131 $ 641,268 $ 18,810 660,078 Total other rental income (2) 9,302 25,042 Rental income $ 622,433 $ 685,120 (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 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 September 30, 2020 and December 31, 2019 (amounts in thousands): Residential Non-Residential Balance Sheet (Other assets): September 30, 2020 December 31, 2019 September 30, 2020 December 31, 2019 Resident/tenant accounts receivable balances $ 24,298 $ 4,040 $ 7,839 $ 1,766 Allowance for doubtful accounts (16,286 ) (1,190 ) (6,595 ) (1,412 ) Net receivable balances $ 8,012 (1) $ 2,850 $ 1,244 $ 354 Straight-line receivable balances $ 11,618 $ 1,841 $ 13,816 $ 26,450 (1) The Company held residential security deposits approximating 31.3% of the net receivable balance at September 30, 2020.
Summary of Residential Bad Debt for Company's Properties	The following table presents residential bad debt for the Company’s properties for the nine months ended September 30, 2020 and 2019 (amounts in thousands): Nine Months Ended September 30, Income Statement (Rental income): 2020 2019 Bad debt, net $ 29,419 $ 9,021 % of rental income 1.5 % 0.5 %

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2020
Debt Instrument [Line Items]
Summary of Mortgage Notes Payable Activity	The following table summarizes the Company’s mortgage notes payable activity for the nine months ended September 30, 2020 (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 September 30, 2020 Fixed Rate Debt: Secured – Conventional $ 1,574,699 $ 495,000 (2) $ (127,767 ) $ (5,821 ) $ 858 $ (1,683 ) $ 1,935,286 Floating Rate Debt: Secured – Conventional 7,050 10,375 — — — 180 17,605 Secured – Tax Exempt 359,861 — — — 933 148 360,942 Floating Rate Debt 366,911 10,375 — — 933 328 378,547 Total $ 1,941,610 $ 505,375 $ (127,767 ) $ (5,821 ) $ 1,791 $ (1,355 ) $ 2,313,833 (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. The following table summarizes the Company’s debt extinguishment costs on mortgages recorded as additional interest expense during the nine months ended September 30, 2020 (amounts in thousands): Description Amount Write-offs of unamortized deferred financing costs $ 37
Summary of Notes Activity	The following table summarizes the Company’s notes activity for the nine months ended September 30, 2020 (amounts in thousands): Notes, net as of December 31, 2019 Proceeds Lump sum payoffs Amortization of premiums/ discounts Amortization of deferred financing costs, net (1) Notes, net as of September 30, 2020 Fixed Rate Debt: Unsecured – Public $ 6,077,513 $ — $ — $ 2,043 $ 3,341 $ 6,082,897 (1) Represents amortization of deferred financing costs, net of debt financing costs.
Schedule of Unsecured Revolving Credit Facility	The following table presents the availability on the Company’s unsecured revolving credit facility as of September 30, 2020 (amounts in thousands): September 30, 2020 Unsecured revolving credit facility commitment $ 2,500,000 Commercial paper balance outstanding — Unsecured revolving credit facility balance outstanding — Other restricted amounts (100,949 ) Unsecured revolving credit facility availability $ 2,399,051
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 nine months ended September 30, 2020: September 30, 2020 Interest Rate Ranges 0.10% - 4.88% Weighted Average Interest Rate 3.39% Maturity Date Ranges 2021-2061
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 nine months ended September 30, 2020: September 30, 2020 Interest Rate Ranges 2.50% - 7.57% Weighted Average Interest Rate 4.04% Maturity Date Ranges 2021-2047

Derivative and Other Fair Val_2

Derivative and Other Fair Value Instruments (Tables)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Summary of Carrying and Fair Values of Financial Instruments	The September 30, 2020 December 31, 2019 Carrying Value Estimated Fair Value (Level 2) Carrying Value Estimated Fair Value (Level 2) Mortgage notes payable, net $ 2,313,833 $ 2,346,248 $ 1,941,610 $ 1,930,710 Unsecured debt, net 6,082,897 6,990,690 7,095,346 7,677,289 Total debt, net $ 8,396,730 $ 9,336,938 $ 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 Fair Value Measurements at Reporting Date Using Description Balance Sheet Location 9/30/2020 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 $ 146,679 $ 146,679 $ — $ — Liabilities Supplemental Executive Retirement Plan Other Liabilities $ 146,679 $ 146,679 $ — $ — Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Mezzanine $ 293,706 $ — $ 293,706 $ — 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 September 30, 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 $ — $ — September 30, 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 )
Summary of Effect of Cash Flow Hedges on the Accompanying Consolidated Statements of Operations and Comprehensive Income	The Effective Portion September 30, 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 $ (17,275 ) Total $ (1,190 ) $ (17,275 ) Effective Portion September 30, 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 $ (14,659 ) Total $ (33,765 ) $ (14,659 )

Earnings Per Share and Earnin_2

Earnings Per Share and Earnings Per Unit (Tables)	9 Months Ended
	Sep. 30, 2020
Schedule of Calculation of Numerator and Denominator in Earnings Per Share and Earnings Per Unit	The Nine Months Ended September 30, Quarter Ended September 30, 2020 2019 2020 2019 Numerator for net income per share – basic: Net income $ 699,517 $ 708,402 $ 95,365 $ 277,846 Allocation to Noncontrolling Interests – Operating Partnership (24,624 ) (25,339 ) (3,376 ) (9,910 ) Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (14,113 ) (2,450 ) (703 ) (830 ) Preferred distributions (2,318 ) (2,318 ) (773 ) (773 ) Numerator for net income per share – basic $ 658,462 $ 678,295 $ 90,513 $ 266,333 Numerator for net income per share – diluted: Net income $ 699,517 $ 708,402 $ 95,365 $ 277,846 Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (14,113 ) (2,450 ) (703 ) (830 ) Preferred distributions (2,318 ) (2,318 ) (773 ) (773 ) Numerator for net income per share – diluted $ 683,086 $ 703,634 $ 93,889 $ 276,243 Denominator for net income per share – basic and diluted: Denominator for net income per share – basic 371,749 370,227 371,869 370,768 Effect of dilutive securities: OP Units 13,010 12,915 13,002 12,941 Long-term compensation shares/units 1,214 3,035 781 3,187 Denominator for net income per share – diluted 385,973 386,177 385,652 386,896 Net income per share – basic $ 1.77 $ 1.83 $ 0.24 $ 0.72 Net income per share – diluted $ 1.77 $ 1.82 $ 0.24 $ 0.71
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): Nine Months Ended September 30, Quarter Ended September 30, 2020 2019 2020 2019 Numerator for net income per Unit – basic and diluted: Net income $ 699,517 $ 708,402 $ 95,365 $ 277,846 Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties (14,113 ) (2,450 ) (703 ) (830 ) Allocation to Preference Units (2,318 ) (2,318 ) (773 ) (773 ) Numerator for net income per Unit – basic and diluted $ 683,086 $ 703,634 $ 93,889 $ 276,243 Denominator for net income per Unit – basic and diluted: Denominator for net income per Unit – basic 384,759 383,142 384,871 383,709 Effect of dilutive securities: Dilution for Units issuable upon assumed exercise/vesting of the Company’s long-term compensation shares/units 1,214 3,035 781 3,187 Denominator for net income per Unit – diluted 385,973 386,177 385,652 386,896 Net income per Unit – basic $ 1.77 $ 1.83 $ 0.24 $ 0.72 Net income per Unit – diluted $ 1.77 $ 1.82 $ 0.24 $ 0.71

Reportable Segments (Tables)

Reportable Segments (Tables)	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Schedule of Reconciliation of NOI from Rental Real Estate Specific to Continuing Operations	The Nine Months Ended September 30, Quarter Ended September 30, 2020 2019 2020 2019 Rental income $ 1,958,270 $ 2,016,796 $ 622,433 $ 685,120 Property and maintenance expense (333,333 ) (338,497 ) (113,065 ) (114,966 ) Real estate taxes and insurance expense (288,043 ) (270,434 ) (95,273 ) (87,546 ) Total operating expenses (621,376 ) (608,931 ) (208,338 ) (202,512 ) Net operating income $ 1,336,894 $ 1,407,865 $ 414,095 $ 482,608
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 nine months and quarters ended September 30, 2020 and 2019, respectively, as well as total assets and capital expenditures at September 30, 2020 (amounts in thousands): Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 Rental Income Operating Expenses NOI Rental Income Operating Expenses NOI Same store (1) Los Angeles $ 355,122 $ 108,953 $ 246,169 $ 363,258 $ 108,606 $ 254,652 Orange County 79,241 18,702 60,539 78,522 18,493 60,029 San Diego 71,430 18,776 52,654 71,088 18,595 52,493 Subtotal - Southern California 505,793 146,431 359,362 512,868 145,694 367,174 San Francisco 346,766 89,557 257,209 354,142 87,117 267,025 Washington D.C. 294,029 90,974 203,055 295,107 90,124 204,983 New York 325,920 148,306 177,614 348,190 144,197 203,993 Seattle 186,030 54,125 131,905 188,093 51,884 136,209 Boston 182,502 53,603 128,899 188,710 53,478 135,232 Denver 13,343 3,711 9,632 13,710 3,576 10,134 Total same store 1,854,383 586,707 1,267,676 1,900,820 576,070 1,324,750 Non-same store/other (2) (3) Non-same store 87,404 27,122 60,282 33,683 10,351 23,332 Other (3) 16,483 7,547 8,936 82,293 22,510 59,783 Total non-same store/other 103,887 34,669 69,218 115,976 32,861 83,115 Totals $ 1,958,270 $ 621,376 $ 1,336,894 $ 2,016,796 $ 608,931 $ 1,407,865 (1) For the nine months ended September 30, 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 74,264 apartment (2) For the nine months ended September 30, 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, (3) Other includes development, other corporate operations and operations prior to disposition for properties sold. Quarter Ended September 30, 2020 Quarter Ended September 30, 2019 Rental Income Operating Expenses NOI Rental Income Operating Expenses NOI Same store (1) Los Angeles $ 115,208 $ 37,023 $ 78,185 $ 122,506 $ 36,461 $ 86,045 Orange County 26,229 6,535 19,694 26,635 6,351 20,284 San Diego 23,581 6,358 17,223 24,064 6,468 17,596 Subtotal - Southern California 165,018 49,916 115,102 173,205 49,280 123,925 San Francisco 113,246 31,349 81,897 122,706 30,453 92,253 Washington D.C. 99,569 32,253 67,316 101,771 31,347 70,424 New York 100,076 50,179 49,897 118,803 48,614 70,189 Seattle 60,216 19,073 41,143 65,370 17,569 47,801 Boston 58,830 18,461 40,369 64,039 17,840 46,199 Denver 6,142 1,927 4,215 6,436 1,760 4,676 Total same store 603,097 203,158 399,939 652,330 196,863 455,467 Non-same store/other (2) (3) Non-same store 19,236 6,136 13,100 9,538 2,856 6,682 Other (3) 100 (956 ) 1,056 23,252 2,793 20,459 Total non-same store/other 19,336 5,180 14,156 32,790 5,649 27,141 Totals $ 622,433 $ 208,338 $ 414,095 $ 685,120 $ 202,512 $ 482,608 (1) For the quarters ended September 30, 2020 and 2019, same store primarily includes all properties acquired or completed that were stabilized prior to July 1, 2019, less properties subsequently sold, which represented 75,596 apartment (2) For the quarters ended September 30, 2020 and 2019, non-same store primarily includes properties acquired after July 1, 2019, plus any properties in lease-up and not stabilized as of July 1, (3) Other includes development, other corporate operations and operations prior to disposition for properties sold. Nine Months Ended September 30, 2020 Total Assets Capital Expenditures Same store (1) Los Angeles $ 3,034,765 $ 17,008 Orange County 392,632 5,056 San Diego 377,663 2,834 Subtotal - Southern California 3,805,060 24,898 San Francisco 3,259,452 11,789 Washington D.C. 3,092,477 15,890 New York 3,948,417 16,571 Seattle 1,818,213 7,010 Boston 1,774,255 13,137 Denver 249,306 512 Total same store 17,947,180 89,807 Non-same store/other (2) (3) Non-same store 1,679,594 1,811 Other (3) 997,204 505 Total non-same store/other 2,676,798 2,316 Totals $ 20,623,978 $ 92,123 (1) Same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2019, less properties subsequently sold, which represented 74,264 apartment (2) Non-same store primarily includes propertie s 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

Business - Additional Informati

Business - Additional Information (Details)	Sep. 30, 2020StatePropertyApartmentUnit
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Number of states in which entity operates | State	9
Properties | Property	305
Apartment units | ApartmentUnit	78,568
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)	Sep. 30, 2020PropertyApartmentUnit
Property/Unit schedule
Properties | Property	305
Apartment Units | ApartmentUnit	78,568
Wholly Owned Properties
Property/Unit schedule
Properties | Property	288
Apartment Units | ApartmentUnit	75,007
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_3

Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jan. 01, 2019
Provision for income tax	$ 262,000	$ 265,000	$ 502,000	$ 749,000
Remaining AMT refund received	$ 1,600,000
Right-of-use assets					$ 434,200,000
Lease liabilities					$ 278,300,000
Federal [Member]
Provision for income tax			$ 0

Equity, Capital and Other Int_3

Equity, Capital and Other Interests - Changes in Company's Issued and Outstanding Common Shares and Units (Details) - shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Equity Capital And Other Interests [Abstract]
Common Stock, Shares, Outstanding	371,670,884	369,405,161
Common Shares Issued:
Conversion of OP Units	99,737	294,400
Exercise of share options	219,922	1,430,048
Employee Share Purchase Plan (ESPP)	69,986	37,263
Restricted share grants, net	178,720	160,460
Common Stock, Shares, Outstanding	372,239,249	371,327,332
Units
Total Units Outstanding	13,731,315	13,904,035
Restricted unit grants, net	247,822	140,055
Conversion of OP Units to Common Shares	(99,737)	(294,400)
Total Units Outstanding	13,879,400	13,749,690
Common Shares And Units Outstanding	386,118,649	385,077,022
Units Ownership Interest in Operating Partnership	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	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
General and Limited Partner Units
Exercise of share options	219,922	1,430,048
Employee Share Purchase Plan (ESPP)	69,986	37,263
Restricted share grants, net	178,720	160,460
Restricted unit grants, net	247,822	140,055
Common Shares And Units Outstanding	386,118,649	385,077,022
Limited Partner Units
Total Units Outstanding	13,731,315	13,904,035
Restricted unit grants, net	247,822	140,055
Conversion of Limited Partner OP Units to EQR Common Shares	(99,737)	(294,400)
Total Units Outstanding	13,879,400	13,749,690
Units Ownership Interest in Operating Partnership	3.60%	3.60%
ERPOP [Member]
General and Limited Partner Units
Common Shares And Units Outstanding	385,402,199	383,309,196
Exercise of share options	219,922	1,430,048
Employee Share Purchase Plan (ESPP)	69,986	37,263
Restricted share grants, net	178,720	160,460
Restricted unit grants, net	247,822	140,055
Common Shares And Units Outstanding	386,118,649	385,077,022
Limited Partner Units
Total Units Outstanding	13,731,315	13,904,035
Restricted unit grants, net	247,822	140,055
Conversion of Limited Partner OP Units to EQR Common Shares	(99,737)	(294,400)
Total Units Outstanding	13,879,400	13,749,690
Units Ownership Interest in Operating Partnership	3.60%	3.60%

Equity, Capital and Other Int_5

Equity, Capital and Other Interests - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Equity Capital And Other Interests [Abstract]
Redeemable noncontrolling interests - operating partnership	$ 293,706	$ 463,400	$ 494,999	$ 379,106
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	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Equity Capital And Other Interests [Abstract]
Redeemable Noncontrolling Interests - Operating Partnership Units	$ 463,400	$ 379,106
Change in market value of Redeemable Noncontrolling Interests – Operating Partnership	(169,825)	114,936
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	131	957
Redeemable Noncontrolling Interests - Operating Partnership Units	$ 293,706	$ 494,999

Equity, Capital and Other Int_7

Equity, Capital and Other Interests - Changes in Redemption Value of Redeemable Limited Partners Interest (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Equity Capital And Other Interests [Abstract]
Redeemable Limited Partners	$ 463,400	$ 379,106
Limited Partners Change In Redemption Value	(169,825)	114,936
Limited Partners Change In Carrying Value	131	957
Redeemable Limited Partners	$ 293,706	$ 494,999

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	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Class Of Stock [Line Items]
8.29% Series K Cumulative Redeemable Preferred Shares/Preference Units; liquidation value $50 per share; 745,600 shares issued and outstanding as of September 30, 2020 and December 31, 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; 745,600 shares issued and outstanding as of September 30, 2020 and December 31, 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	9 Months Ended	12 Months Ended
	Sep. 30, 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)	80 Months Ended	153 Months Ended
	Sep. 30, 2020shares	Sep. 30, 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	Sep. 30, 2020	Dec. 31, 2019
Land	$ 5,794,771	$ 5,936,188
Depreciable property:
Buildings and improvements	18,626,029	18,904,686
Furniture, fixtures and equipment	1,962,223	1,916,458
In-Place lease intangibles	487,970	497,957
Projects under development:
Projects under development	337,696	181,630
Land held for development:
Land held for development	103,900	96,688
Investment in real estate	27,312,589	27,533,607
Accumulated depreciation	(7,738,318)	(7,276,786)
Investment in real estate, net	19,574,271	20,256,821
Land [Member]
Projects under development:
Projects under development	23,531	23,531
Land held for development:
Land held for development	64,490	64,460
Construction-in-progress [Member]
Projects under development:
Projects under development	314,165	158,099
Land held for development:
Land held for development	$ 39,410	$ 32,228

Real Estate - Acquired Properti

Real Estate - Acquired Properties From Unaffiliated Parties (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)PropertyApartmentUnit
Properties disposed | Property	1
Property Units disposed | ApartmentUnit	158
Purchase Price | $	$ 48,860
Rental Properties – Consolidated [Member]
Properties disposed | Property	1
Property Units disposed | ApartmentUnit	158
Purchase Price | $	$ 48,860

Real Estate - Acquired Proper_2

Real Estate - Acquired Properties From Unaffiliated Parties (Parenthetical) (Details) $ in Thousands	Sep. 30, 2020USD ($)
Purchase price	$ 48,860
Land [Member]
Purchase price	5,500
Depreciable Property [Member]
Purchase price	$ 43,400

Real Estate - Disposed Properti

Real Estate - Disposed Properties to Unaffiliated Parties (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)PropertyApartmentUnit
Properties disposed | Property	5
Property Units disposed | ApartmentUnit	1,552
Sales Price | $	$ 754,361
Rental Properties – Consolidated [Member]
Properties disposed | Property	5
Property Units disposed | ApartmentUnit	1,552
Sales Price | $	$ 754,361

Real Estate - Additional Inform

Real Estate - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Real Estate [Abstract]
Net gain on sales of real estate properties	$ (25)	$ 130,565	$ 352,218	$ 269,400

Commitments to Acquire_Dispos_3

Commitments to Acquire/Dispose of Real Estate - Separate Agreements to Dispose (Details) $ in Thousands	Sep. 30, 2020USD ($)
Property/Unit schedule
Sales Price	$ 55,710
Net Book Value	19,475
Land [Member]
Property/Unit schedule
Sales Price	55,710
Net Book Value	$ 19,475

Investments in Partially Owne_3

Investments in Partially Owned Entities - Consolidated Variable Interest Entities ("VIEs") - Additional Information (Details) $ in Thousands	Sep. 30, 2020USD ($)PropertyApartmentUnit	Dec. 31, 2019USD ($)
Variable Interest Entity [Line Items]
Properties | Property	305
Apartment units | ApartmentUnit	78,568
Total assets	$ 20,623,978	$ 21,172,769
Total liabilities	$ 9,575,906	10,164,843
Consolidated VIE [Member]
Variable Interest Entity [Line Items]
Properties | Property	16
Apartment units | ApartmentUnit	3,399
Total assets	$ 764,200	754,700
Total liabilities	$ 210,200	$ 323,100

Investments in Partially Owne_4

Investments in Partially Owned Entities - Summary of Company's Investment in Unconsolidated Entities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	$ 54,828	$ 52,238
Real Estate Technology [Member]
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	16,246	12,318
Other [Member]
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	(238)	(441)
Unconsolidated VIE [Member] | Operating Property [Member]
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	$ 38,820	$ 40,361
Ownership Percentage	33.30%

Investments in Partially Owne_5

Investments in Partially Owned Entities - Summary of Company's Investment in Unconsolidated Entities (Parenthetical) (Details)	Sep. 30, 2020Entity
Real Estate Technology [Member]
Variable Interest Entity [Line Items]
Number of separate unconsolidated investment funds/Companies	5

Restricted Deposits - Restricte

Restricted Deposits - Restricted Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Mortgage escrow deposits:
Replacement reserves	$ 9,558	$ 8,543
Mortgage principal reserves/sinking funds	13,013	9,689
Mortgage escrow deposits	22,571	18,232
Restricted cash:
Tax-deferred (1031) exchange proceeds		14,232
Restricted deposits on real estate investments	722	658
Resident security and utility deposits	32,215	37,140
Other	1,373	984
Restricted cash	34,310	53,014
Restricted deposits	$ 56,881	$ 71,246	$ 55,819

Leases - Additional Information

Leases - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020USD ($)
COVID-19 [Member]
Operating Leased Assets [Line Items]
Write-off of straight-line rent receivables	$ 12.9
Residential Apartment Leases [Member]
Operating Leased Assets [Line Items]
Percentage of rental income	98.00%
Non-residential Leases [Member]
Operating Leased Assets [Line Items]
Percentage of rental income	2.00%
Decrease in rental revenues	$ 5.6
Non-residential Leases [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Retail leases term	5 years
Non-residential Leases [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Retail leases term	10 years

Leases - Summary of Lease Incom

Leases - Summary of Lease Income Types Relating to Lease Payments along with Total Other Rental Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating Leased Assets [Line Items]
Residential and non-residential rent	$ 613,131	$ 660,078	$ 1,913,441	$ 1,946,999
Rental income	622,433	685,120	1,958,270	2,016,796
Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	606,834	641,268	1,876,285	1,891,423
Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	6,297	18,810	37,156	55,576
Residential and Non-Residential Rent [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	582,234	629,473	1,819,561	1,856,365
Residential and Non-Residential Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	576,192	611,020	1,783,298	1,801,749
Residential and Non-Residential Rent [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	6,042	18,453	36,263	54,616
Utility Recoveries (RUBS Income) [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	17,440	17,225	53,047	50,940
Utility Recoveries (RUBS Income) [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	17,306	16,987	52,538	50,290
Utility Recoveries (RUBS Income) [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	134	238	509	650
Parking Rent [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	9,693	9,505	29,376	28,133
Parking Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	9,592	9,405	29,052	27,874
Parking Rent [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	101	100	324	259
Storage Rent [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	921	959	2,874	2,847
Storage Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	901	940	2,814	2,796
Storage Rent [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	20	19	60	51
Pet Rent [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	2,843	2,916	8,583	8,714
Pet Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	2,843	2,916	8,583	8,714
Other Rental Income [Member]
Operating Leased Assets [Line Items]
Rental income	$ 9,302	$ 25,042	$ 44,829	$ 69,797

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	Sep. 30, 2020	Dec. 31, 2019
Residential Leases [Member]
Operating Leased Assets [Line Items]
Resident/tenant accounts receivable balances	$ 24,298	$ 4,040
Allowance for doubtful accounts	(16,286)	(1,190)
Net receivable balances	8,012	2,850
Straight-line receivable balances	11,618	1,841
Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Resident/tenant accounts receivable balances	7,839	1,766
Allowance for doubtful accounts	(6,595)	(1,412)
Net receivable balances	1,244	354
Straight-line receivable balances	$ 13,816	$ 26,450

Leases - Summary of Residenti_2

Leases - Summary of Residential and Non-Residential Accounts Receivable and Straight-Line Receivable Balances (Parenthetical) (Details)	Sep. 30, 2020
Leases [Abstract]
Holding percentage of residential security deposits of net receivable	31.30%

Leases - Summary of Residenti_3

Leases - Summary of Residential Bad Debt for Company's Properties (Details) - Residential Leases [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Lessor Lease Description [Line Items]
Bad debt, net	$ 29,419	$ 9,021
Rental Income [Member]
Lessor Lease Description [Line Items]
% of rental income	1.50%	0.50%

Debt - Mortgage Notes Payable -

Debt - Mortgage Notes Payable - Summary of Mortgage Notes Payable Activity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	$ 1,941,610
Proceeds	505,375	$ 295,713
Lump sum payoffs	(127,767)	(723,021)
Scheduled principal repayments	(5,821)
Amortization of premiums/ discounts	1,791	$ 8,017
Amortization of deferred financing costs, net	(1,355)
Mortgage notes payable, net ending balance	2,313,833
Fixed Rate Debt [Member] | Secured – Conventional [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	1,574,699
Proceeds	495,000
Lump sum payoffs	(127,767)
Scheduled principal repayments	(5,821)
Amortization of premiums/ discounts	858
Amortization of deferred financing costs, net	(1,683)
Mortgage notes payable, net ending balance	1,935,286
Floating Rate Debt [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	366,911
Proceeds	10,375
Amortization of premiums/ discounts	933
Amortization of deferred financing costs, net	328
Mortgage notes payable, net ending balance	378,547
Floating Rate Debt [Member] | Secured – Conventional [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	7,050
Proceeds	10,375
Amortization of deferred financing costs, net	180
Mortgage notes payable, net ending balance	17,605
Floating Rate Debt [Member] | Secured – Tax Exempt [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	359,861
Amortization of premiums/ discounts	933
Amortization of deferred financing costs, net	148
Mortgage notes payable, net ending balance	$ 360,942

Debt - Mortgage Notes Payable_2

Debt - Mortgage Notes Payable - Summary of Mortgage Notes Payable Activity (Parenthetical) (Details)	9 Months Ended
	Sep. 30, 2020
Debt Instrument [Line Items]
Debt instrument, maturity date	Nov. 1, 2024
Fannie Mae Loan Pool [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.60%
Debt instrument, maturity date	May 1, 2030

Debt - Mortgage Notes Payable_3

Debt - Mortgage Notes Payable - Summary of Debt Extinguishment Costs on Mortgages Recorded as Additional Interest Expense (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)
Debt Disclosure [Abstract]
Write-offs of unamortized deferred financing costs	$ 37

Debt - Mortgage Notes Payable_4

Debt - Mortgage Notes Payable - Summary of Certain Interest Rate and Maturity Date Information (Details) - Mortgages [Member]	9 Months Ended
	Sep. 30, 2020
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.39%
Maturity Date Ranges, Start	2021
Maturity Date Ranges, End	2061
Minimum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	0.10%
Maximum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	4.88%

Debt - Mortgage Notes Payable_5

Debt - Mortgage Notes Payable - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Mortgage notes payable	$ 2,313,833	$ 1,941,610
Credit Enhanced Debt [Member]
Debt Instrument [Line Items]
Mortgage notes payable	$ 281,700

Debt - Notes - Summary of Notes

Debt - Notes - Summary of Notes Activity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Notes, net beginning balance	$ 6,077,513
Proceeds		$ 1,194,468
Lump sum payoffs		(450,000)
Amortization of premiums/ discounts	2,043	$ 2,120
Notes, net ending balance	6,082,897
Fixed Rate Debt [Member] | Unsecured – Public [Member]
Debt Instrument [Line Items]
Notes, net beginning balance	6,077,513
Amortization of premiums/ discounts	2,043
Amortization of deferred financing costs, net	3,341
Notes, net ending balance	$ 6,082,897

Debt - Notes - Summary of Certa

Debt - Notes - Summary of Certain Interest Rate and Maturity Date Information (Details) - Notes [Member]	9 Months Ended
	Sep. 30, 2020
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.04%
Maturity Date Ranges, Start	2021
Maturity Date Ranges, End	2047
Minimum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	2.50%
Maximum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	7.57%

Debt - Line of Credit and Comme

Debt - Line of Credit and Commercial Paper - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2020	Nov. 04, 2019	Nov. 03, 2019	Nov. 01, 2019	Oct. 31, 2019
Line of Credit Facility [Line Items]
Unsecured revolving credit facility				$ 2,500,000,000	$ 2,000,000,000
Debt instrument, maturity date	Nov. 1, 2024
Commercial paper balance outstanding	$ 1,000,000,000	$ 1,000,000,000	$ 500,000,000
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Weighted average interest rates	1.81%
Weighted average amount outstanding	$ 347,200,000
Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Unsecured revolving credit facility	2,500,000,000
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%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Weighted average interest rates	1.47%

Debt - Line of Credit and Com_2

Debt - Line of Credit and Commercial Paper - Schedule of Unsecured Revolving Credit Facility (Details) - USD ($)	9 Months Ended
	Sep. 30, 2020	Nov. 04, 2019	Nov. 03, 2019	Nov. 01, 2019	Oct. 31, 2019
Line of Credit Facility [Line Items]
Unsecured revolving credit facility commitment				$ 2,500,000,000	$ 2,000,000,000
Commercial paper balance outstanding	$ (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
Other restricted amounts	(100,949,000)
Unsecured revolving credit facility availability	$ 2,399,051,000

Derivative and Other Fair Val_3

Derivative and Other Fair Value Instruments - Summary of Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	$ 8,396,730	$ 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	9,336,938	9,607,999
Mortgage Notes Payable, Net [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	2,313,833	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	2,346,248	1,930,710
Unsecured Debt [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	6,082,897	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	$ 6,990,690	$ 7,677,289

Derivative and Other Fair Val_4

Derivative and Other Fair Value Instruments - Summary of Fair Value Measurements for Each Major Category of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Fair Value Of SERP Investments	$ 146,679	$ 151,889
Other Liabilities, Fair Value Disclosure	146,679	151,889
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	293,706	463,400	$ 494,999	$ 379,106
Fair Value, Inputs, Level 1 [Member]
Derivatives, Fair Value [Line Items]
Fair Value Of SERP Investments	146,679	151,889
Other Liabilities, Fair Value Disclosure	146,679	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	293,706	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_5

Derivative and Other Fair Value Instruments - Summary of Effect of Fair Value Hedges on the Accompanying Consolidated Statements of Operations and Comprehensive Income (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative	$ 2,277
Amount of Gain/(Loss) Recognized in Income on Hedged Item	(2,277)
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative	2,277
Amount of Gain/(Loss) Recognized in Income on Hedged Item	$ (2,277)

Derivative and Other Fair Val_6

Derivative and Other Fair Value Instruments - Summary of Effect of Cash Flow Hedges on the Accompanying Consolidated Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion - Amount of Gain/(Loss) Recognized in OCI on Derivative	$ (1,190)	$ (33,765)
Effective Portion - Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income	(17,275)	(14,659)
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)
Effective Portion - Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income	$ (17,275)	$ (14,659)

Derivative and Other Fair Val_7

Derivative and Other Fair Value Instruments - Additional Information (Details) $ in Millions	1 Months Ended	9 Months Ended	12 Months Ended
	Apr. 30, 2020USD ($)DerivativeInstrument	Sep. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Derivative [Line Items]
Unrealized gain (loss) on interest rate cash flow hedges, pretax, accumulated other comprehensive income (loss)		$ 61.5	$ 77.6
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net		$ 24.3
Forward Starting Swaps [Member]
Derivative [Line Items]
Payments for settlement of derivative instruments	$ 1.2
Forward starting swaps settled | DerivativeInstrument	2
Increase (decrease) in charges hedge termination activities	$ 1.2
Mortgage notes period	5 years
Mortgages [Member] | Forward Starting Swaps [Member]
Derivative [Line Items]
Debt instrument face amount	$ 495
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	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 95,365	$ 277,846	$ 699,517	$ 708,402
Allocation to Noncontrolling Interests – Operating Partnership	(3,376)	(9,910)	(24,624)	(25,339)
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	(703)	(830)	(14,113)	(2,450)
Preferred distributions	(773)	(773)	(2,318)	(2,318)
Net income available to Common Shares	90,513	266,333	658,462	678,295
Numerator for net income per share – diluted	$ 93,889	$ 276,243	$ 683,086	$ 703,634
Weighted average Common Shares outstanding	371,869	370,768	371,749	370,227
OP Units	13,002	12,941	13,010	12,915
Dilutive Securities Options	781	3,187	1,214	3,035
Denominator for net income per share – diluted	385,652	386,896	385,973	386,177
Net income per share – basic	$ 0.24	$ 0.72	$ 1.77	$ 1.83
Net income per share – diluted	$ 0.24	$ 0.71	$ 1.77	$ 1.82

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	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income	$ 95,365	$ 277,846	$ 699,517	$ 708,402
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	$ (703)	$ (830)	$ (14,113)	$ (2,450)
Dilutive Securities Options	781	3,187	1,214	3,035
Denominator for net income per share – diluted	385,652	386,896	385,973	386,177
Net income per Unit – basic	$ 0.24	$ 0.72	$ 1.77	$ 1.83
Net income per Unit – diluted	$ 0.24	$ 0.71	$ 1.77	$ 1.82
ERPOP [Member]
Net income	$ 95,365	$ 277,846	$ 699,517	$ 708,402
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	(703)	(830)	(14,113)	(2,450)
Allocation to Preference Units	(773)	(773)	(2,318)	(2,318)
Numerator for net income per Unit – basic and diluted	$ 93,889	$ 276,243	$ 683,086	$ 703,634
Denominator for net income per Unit – basic	384,871	383,709	384,759	383,142
Dilutive Securities Options	781	3,187	1,214	3,035
Denominator for net income per share – diluted	385,652	386,896	385,973	386,177
Net income per Unit – basic	$ 0.24	$ 0.72	$ 1.77	$ 1.83
Net income per Unit – diluted	$ 0.24	$ 0.71	$ 1.77	$ 1.82

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020USD ($)PropertyApartmentUnitAgreement
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 | $	$ 265.1
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

Reportable Segments - Additiona

Reportable Segments - Additional Information (Details) - Customer	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Number of customer contributed 10% or more of total revenue	0	0
Non-residential Leases [Member] | Revenue [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	2.00%

Reportable Segments - Reconcili

Reportable Segments - Reconciliation of NOI from Rental Real Estate Specific to Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Rental income	$ 622,433	$ 685,120	$ 1,958,270	$ 2,016,796
Property and maintenance expense	(113,065)	(114,966)	(333,333)	(338,497)
Real estate taxes and insurance expense	(95,273)	(87,546)	(288,043)	(270,434)
Operating income	182,410	368,338	961,384	947,232
Same Store, Non-same Store and Other
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Rental income	622,433	685,120	1,958,270	2,016,796
Property and maintenance expense	(113,065)	(114,966)	(333,333)	(338,497)
Real estate taxes and insurance expense	(95,273)	(87,546)	(288,043)	(270,434)
Total operating expenses	(208,338)	(202,512)	(621,376)	(608,931)
Operating income	$ 414,095	$ 482,608	$ 1,336,894	$ 1,407,865

Reportable Segments - NOI for E

Reportable Segments - NOI for Each Segment from Our Rental Real Estate Specific to Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Rental income	$ 622,433	$ 685,120	$ 1,958,270	$ 2,016,796
Operating income	182,410	368,338	961,384	947,232
Total Assets	20,623,978		20,623,978		$ 21,172,769
Capital Expenditures			92,123
Same Store
Segment Reporting Information [Line Items]
Rental income	603,097	652,330	1,854,383	1,900,820
Operating expenses	203,158	196,863	586,707	576,070
Operating income	399,939	455,467	1,267,676	1,324,750
Total Assets	17,947,180		17,947,180
Capital Expenditures			89,807
Non-same store/other
Segment Reporting Information [Line Items]
Rental income	19,336	32,790	103,887	115,976
Operating expenses	5,180	5,649	34,669	32,861
Operating income	14,156	27,141	69,218	83,115
Total Assets	2,676,798		2,676,798
Capital Expenditures			2,316
Same Store, Non-same Store and Other
Segment Reporting Information [Line Items]
Rental income	622,433	685,120	1,958,270	2,016,796
Operating expenses	208,338	202,512	621,376	608,931
Operating income	414,095	482,608	1,336,894	1,407,865
Los Angeles | Same Store
Segment Reporting Information [Line Items]
Rental income	115,208	122,506	355,122	363,258
Operating expenses	37,023	36,461	108,953	108,606
Operating income	78,185	86,045	246,169	254,652
Total Assets	3,034,765		3,034,765
Capital Expenditures			17,008
Orange County | Same Store
Segment Reporting Information [Line Items]
Rental income	26,229	26,635	79,241	78,522
Operating expenses	6,535	6,351	18,702	18,493
Operating income	19,694	20,284	60,539	60,029
Total Assets	392,632		392,632
Capital Expenditures			5,056
San Diego | Same Store
Segment Reporting Information [Line Items]
Rental income	23,581	24,064	71,430	71,088
Operating expenses	6,358	6,468	18,776	18,595
Operating income	17,223	17,596	52,654	52,493
Total Assets	377,663		377,663
Capital Expenditures			2,834
Subtotal - Southern California | Same Store
Segment Reporting Information [Line Items]
Rental income	165,018	173,205	505,793	512,868
Operating expenses	49,916	49,280	146,431	145,694
Operating income	115,102	123,925	359,362	367,174
Total Assets	3,805,060		3,805,060
Capital Expenditures			24,898
San Francisco | Same Store
Segment Reporting Information [Line Items]
Rental income	113,246	122,706	346,766	354,142
Operating expenses	31,349	30,453	89,557	87,117
Operating income	81,897	92,253	257,209	267,025
Total Assets	3,259,452		3,259,452
Capital Expenditures			11,789
Washington DC | Same Store
Segment Reporting Information [Line Items]
Rental income	99,569	101,771	294,029	295,107
Operating expenses	32,253	31,347	90,974	90,124
Operating income	67,316	70,424	203,055	204,983
Total Assets	3,092,477		3,092,477
Capital Expenditures			15,890
New York | Same Store
Segment Reporting Information [Line Items]
Rental income	100,076	118,803	325,920	348,190
Operating expenses	50,179	48,614	148,306	144,197
Operating income	49,897	70,189	177,614	203,993
Total Assets	3,948,417		3,948,417
Capital Expenditures			16,571
Boston | Same Store
Segment Reporting Information [Line Items]
Rental income	58,830	64,039	182,502	188,710
Operating expenses	18,461	17,840	53,603	53,478
Operating income	40,369	46,199	128,899	135,232
Total Assets	1,774,255		1,774,255
Capital Expenditures			13,137
Seattle | Same Store
Segment Reporting Information [Line Items]
Rental income	60,216	65,370	186,030	188,093
Operating expenses	19,073	17,569	54,125	51,884
Operating income	41,143	47,801	131,905	136,209
Total Assets	1,818,213		1,818,213
Capital Expenditures			7,010
Denver | Same Store
Segment Reporting Information [Line Items]
Rental income	6,142	6,436	13,343	13,710
Operating expenses	1,927	1,760	3,711	3,576
Operating income	4,215	4,676	9,632	10,134
Total Assets	249,306		249,306
Capital Expenditures			512
Non-same store | Non-same store/other
Segment Reporting Information [Line Items]
Rental income	19,236	9,538	87,404	33,683
Operating expenses	6,136	2,856	27,122	10,351
Operating income	13,100	6,682	60,282	23,332
Total Assets	1,679,594		1,679,594
Capital Expenditures			1,811
Other | Non-same store/other
Segment Reporting Information [Line Items]
Rental income	100	23,252	16,483	82,293
Operating expenses	(956)	2,793	7,547	22,510
Operating income	1,056	$ 20,459	8,936	$ 59,783
Total Assets	$ 997,204		997,204
Capital Expenditures			$ 505

Reportable Segments - NOI for_2

Reportable Segments - NOI for Each Segment from Our Rental Real Estate Specific to Continuing Operations (Parenthetical) (Details) - Property	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Disclosure Of Entitys Reportable Segments [Abstract]
Units in same store properties	75,596	75,596	74,264	74,264