CONSOLIDATED STATEMENTS OF CASH FLOWS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 332,671	$ 109,257
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	212,422	204,215
Amortization of deferred financing costs	2,041	2,136
Amortization of above/below market lease intangibles	(18)	(18)
Amortization of discounts and premiums on debt	1,276	1,418
Amortization of deferred settlements on derivative instruments	5,631	4,390
Amortization of right-of-use assets	3,007	4,022
Write-off of pursuit costs	1,627	1,448
(Income) loss from investments in unconsolidated entities	1,157	707
Distributions from unconsolidated entities – return on capital	100	693
Net (gain) loss on sales of real estate properties	(207,977)	21
Net (gain) loss on sales of land parcels		(1)
Realized/unrealized (gain) loss on derivative instruments	25
Compensation paid with Company Common Shares	7,844	9,806
Other operating activities, net	1,805
Changes in assets and liabilities:
(Increase) decrease in other assets	(18,386)	(14,325)
Increase (decrease) in accounts payable and accrued expenses	62,573	63,789
Increase (decrease) in accrued interest payable	(927)	11,406
Increase (decrease) in lease liabilities	(621)	(554)
Increase (decrease) in other liabilities	(20,811)	(25,942)
Increase (decrease) in security deposits	(988)	1,077
Net cash provided by operating activities	382,451	373,545
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions		(258,938)
Investment in real estate – development/other	(52,204)	(45,327)
Capital expenditures to real estate	(38,342)	(34,018)
Non-real estate capital additions	(4,516)	(1,018)
Interest capitalized for real estate under development	(1,834)	(1,202)
Proceeds from disposition of real estate, net	368,364
Investments in unconsolidated entities	(5,458)	(6,281)
Purchase of investment securities and other investments	(1)	(251)
Net cash provided by (used for) investing activities	266,009	(347,035)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(181)	(1,492)
Mortgage notes payable, net:
Proceeds	78	288,120
Scheduled principal repayments	(1,941)	(1,619)
Line of credit and commercial paper:
Line of credit proceeds	720,000	1,995,000
Line of credit repayments	(740,000)	(1,995,000)
Commercial paper proceeds	1,905,818	3,985,661
Commercial paper repayments	(2,291,000)	(4,140,000)
Proceeds from (payments on) settlement of derivative instruments	(25)
Proceeds from Employee Share Purchase Plan (ESPP)	869	1,126
Proceeds from exercise of EQR options	11,151	29,860
Contributions – Noncontrolling Interests – Partially Owned Properties	341
Contributions – Limited Partners	12
Distributions:
OP Units – General Partner	(211,239)	(199,749)
Preference Units	(773)
OP Units – Limited Partners	(8,484)	(7,256)
Noncontrolling Interests – Partially Owned Properties	(9,315)	(3,968)
Net cash provided by (used for) financing activities	(624,689)	(49,317)
Net increase (decrease) in cash and cash equivalents and restricted deposits	23,771	(22,807)
Cash and cash equivalents and restricted deposits, beginning of period	116,999	116,313
Cash and cash equivalents and restricted deposits, end of period	140,770	93,506
Cash and cash equivalents	82,335	29,391
Restricted deposits	58,435	64,115
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	75,561	74,777
Net cash paid (received) for income and other taxes	266	531
Amortization of deferred financing costs:
Investment in real estate, net	60
Other assets	584	603
Mortgage notes payable, net	403	416
Notes, net	1,114	1,117
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	595	736
Notes, net	681	682
Amortization of deferred settlements on derivative instruments:
Other liabilities	(3)	(3)
Accumulated other comprehensive income	5,634	4,393
Write-off of pursuit costs:
Investment in real estate, net	1,586	1,437
Other assets	33	11
Accounts payable and accrued expenses	8
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	830	364
Other liabilities	327	343
Realized/unrealized (gain) loss on derivative instruments:
Other assets		1,337
Notes, net		1,255
Other liabilities	992	11,828
Accumulated other comprehensive income	(967)	(14,420)
Investments in unconsolidated entities:
Investments in unconsolidated entities	(4,558)	(5,561)
Other liabilities	(900)	(720)
Debt financing costs:
Other assets	(181)	145
Mortgage notes payable, net		(1,632)
Notes, net		(5)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets		(438,705)
Other assets		184,116
Lease liabilities		282,791
Other liabilities		28,202
ERPOP [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	332,671	109,257
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	212,422	204,215
Amortization of deferred financing costs	2,041	2,136
Amortization of above/below market lease intangibles	(18)	(18)
Amortization of discounts and premiums on debt	1,276	1,418
Amortization of deferred settlements on derivative instruments	5,631	4,390
Amortization of right-of-use assets	3,007	4,022
Write-off of pursuit costs	1,627	1,448
(Income) loss from investments in unconsolidated entities	1,157	707
Distributions from unconsolidated entities – return on capital	100	693
Net (gain) loss on sales of real estate properties	(207,977)	21
Net (gain) loss on sales of land parcels		(1)
Realized/unrealized (gain) loss on derivative instruments	25
Compensation paid with Company Common Shares	7,844	9,806
Other operating activities, net	1,805
Changes in assets and liabilities:
(Increase) decrease in other assets	(18,386)	(14,325)
Increase (decrease) in accounts payable and accrued expenses	62,573	63,789
Increase (decrease) in accrued interest payable	(927)	11,406
Increase (decrease) in lease liabilities	(621)	(554)
Increase (decrease) in other liabilities	(20,811)	(25,942)
Increase (decrease) in security deposits	(988)	1,077
Net cash provided by operating activities	382,451	373,545
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions		(258,938)
Investment in real estate – development/other	(52,204)	(45,327)
Capital expenditures to real estate	(38,342)	(34,018)
Non-real estate capital additions	(4,516)	(1,018)
Interest capitalized for real estate under development	(1,834)	(1,202)
Proceeds from disposition of real estate, net	368,364
Investments in unconsolidated entities	(5,458)	(6,281)
Purchase of investment securities and other investments	(1)	(251)
Net cash provided by (used for) investing activities	266,009	(347,035)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(181)	(1,492)
Mortgage notes payable, net:
Proceeds	78	288,120
Scheduled principal repayments	(1,941)	(1,619)
Line of credit and commercial paper:
Line of credit proceeds	720,000	1,995,000
Line of credit repayments	(740,000)	(1,995,000)
Commercial paper proceeds	1,905,818	3,985,661
Commercial paper repayments	(2,291,000)	(4,140,000)
Proceeds from (payments on) settlement of derivative instruments	(25)
Proceeds from Employee Share Purchase Plan (ESPP)	869	1,126
Proceeds from exercise of EQR options	11,151	29,860
Contributions – Noncontrolling Interests – Partially Owned Properties	341
Contributions – Limited Partners	12
Distributions:
OP Units – General Partner	(211,239)	(199,749)
Preference Units	(773)
OP Units – Limited Partners	(8,484)	(7,256)
Noncontrolling Interests – Partially Owned Properties	(9,315)	(3,968)
Net cash provided by (used for) financing activities	(624,689)	(49,317)
Net increase (decrease) in cash and cash equivalents and restricted deposits	23,771	(22,807)
Cash and cash equivalents and restricted deposits, beginning of period	116,999	116,313
Cash and cash equivalents and restricted deposits, end of period	140,770	93,506
Cash and cash equivalents	82,335	29,391
Restricted deposits	58,435	64,115
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	75,561	74,777
Net cash paid (received) for income and other taxes	266	531
Amortization of deferred financing costs:
Investment in real estate, net	(60)
Other assets	584	603
Mortgage notes payable, net	403	416
Notes, net	1,114	1,117
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	595	736
Notes, net	681	682
Amortization of deferred settlements on derivative instruments:
Other liabilities	(3)	(3)
Accumulated other comprehensive income	5,634	4,393
Write-off of pursuit costs:
Investment in real estate, net	1,586	1,437
Other assets	33	11
Accounts payable and accrued expenses	8
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	830	364
Other liabilities	327	343
Realized/unrealized (gain) loss on derivative instruments:
Other assets		1,337
Notes, net		1,255
Other liabilities	992	11,828
Accumulated other comprehensive income	(967)	(14,420)
Investments in unconsolidated entities:
Investments in unconsolidated entities	(4,558)	(5,561)
Other liabilities	(900)	(720)
Debt financing costs:
Other assets	$ (181)	145
Mortgage notes payable, net		(1,632)
Notes, net		(5)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets		(438,705)
Other assets		184,116
Lease liabilities		282,791
Other liabilities		$ (28,202)