CONSOLIDATED STATEMENTS OF CASH FLOWS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 364,933	$ 306,476
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	437,185	453,767
Amortization of deferred financing costs	3,996	4,201
Amortization of discounts and premiums on debt	1,740	2,891
Amortization of deferred settlements on derivative instruments	2,195	4,875
Amortization of right-of-use assets	6,357	6,103
Write-off of pursuit costs	1,993	2,515
(Income) loss from investments in unconsolidated entities	2,605	2,429
Distributions from unconsolidated entities – return on capital	290	164
Net (gain) loss on sales of real estate properties	(100,122)	(107,795)
Realized (gain) loss on sale of investment securities	87	(2,064)
Compensation paid with Company Common Shares	20,845	18,600
Changes in assets and liabilities:
(Increase) decrease in other assets	(13,258)	(2,096)
Increase (decrease) in accounts payable and accrued expenses	25,424	22,615
Increase (decrease) in accrued interest payable	(72)	(473)
Increase (decrease) in lease liabilities	(658)	(817)
Increase (decrease) in other liabilities	(8,047)	(23,985)
Increase (decrease) in security deposits	487	3,468
Net cash provided by operating activities	745,980	690,874
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(186,676)	(113,046)
Investment in real estate – development/other	(46,815)	(55,491)
Capital expenditures to real estate	(135,247)	(83,304)
Non-real estate capital additions	(1,043)	(981)
Interest capitalized for real estate and unconsolidated entities under development	(6,979)	(2,267)
Proceeds from disposition of real estate, net	133,916	255,922
Investments in unconsolidated entities - acquisitions	(989)
Investments in unconsolidated entities - development/other	(25,413)	(48,577)
Distributions from unconsolidated entities – return of capital	15	9
Purchase of investment securities and other investments	(2,500)	(1,034)
Proceeds from sale of investment securities	452	3,434
Net cash provided by (used for) investing activities	(271,279)	(45,335)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs		(228)
Mortgage notes payable, net:
Proceeds	22,896	14,586
Lump sum payoffs	(64,722)	(260,874)
Scheduled principal repayments	(54)	(2,985)
Line of credit and commercial paper:
Commercial paper proceeds	2,382,619	2,836,037
Commercial paper repayments	(2,328,100)	(2,966,121)
Finance ground lease principal payments	(1,329)	(1,229)
Proceeds from Employee Share Purchase Plan (ESPP)	2,124	2,378
Proceeds from exercise of EQR options	11,358	18,928
Payment of offering costs		(487)
Other financing activities, net	(31)	(31)
Acquisition of Noncontrolling Interests – Partially Owned Properties	(3,737)	(32,178)
Contributions – Noncontrolling Interests – Partially Owned Properties	9	603
Contributions – Limited Partners	1	1
Distributions:
OP Units – General Partner	(487,483)	(461,605)
Preference Units	(2,319)	(1,545)
OP Units – Limited Partners	(15,233)	(15,142)
Noncontrolling Interests – Partially Owned Properties	(3,230)	(17,232)
Net cash provided by (used for) financing activities	(487,231)	(887,124)
Net increase (decrease) in cash and cash equivalents and restricted deposits	(12,530)	(241,585)
Cash and cash equivalents and restricted deposits, beginning of period	137,172	360,236
Cash and cash equivalents and restricted deposits, end of period	124,642	118,651
Cash and cash equivalents	35,701	45,010
Restricted deposits	88,941	73,641
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	125,518	136,787
Net cash paid (received) for income and other taxes	911	687
Amortization of deferred financing costs:
Investment in real estate, net	(211)	(253)
Other assets	1,392	1,170
Mortgage notes payable, net	895	1,159
Notes, net	1,920	2,125
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	616	1,545
Notes, net	1,124	1,346
Amortization of deferred settlements on derivative instruments:
Other liabilities	(6)	(6)
Accumulated other comprehensive income	2,201	4,881
Write-off of pursuit costs:
Investment in real estate, net	316	761
Investments in unconsolidated entities	1,111	1,637
Other assets	566	117
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	1,972	1,797
Other liabilities	633	632
Realized/unrealized (gain) loss on derivative instruments:
Other assets	(3,359)
Other liabilities	(695)	1,259
Accumulated other comprehensive income	4,054	(1,259)
Interest capitalized for real estate and unconsolidated entities under development:
Investment in real estate, net	(2,988)	(675)
Investments in unconsolidated entities	3,991	1,592
Investments in unconsolidated entities - development/other:
Investments in unconsolidated entities	(24,633)	(47,887)
Debt financing costs:
Mortgage notes payable, net		(228)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets	(7,105)	(224)
Lease liabilities	7,105	224
Non-cash share distribution and other transfers from unconsolidated entities:
Investments in unconsolidated entities	539	4,048
Other assets	(539)	(4,048)
ERPOP [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	364,933	306,476
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	437,185	453,767
Amortization of deferred financing costs	3,996	4,201
Amortization of discounts and premiums on debt	1,740	2,891
Amortization of deferred settlements on derivative instruments	2,195	4,875
Amortization of right-of-use assets	6,357	6,103
Write-off of pursuit costs	1,993	2,515
(Income) loss from investments in unconsolidated entities	2,605	2,429
Distributions from unconsolidated entities – return on capital	290	164
Net (gain) loss on sales of real estate properties	(100,122)	(107,795)
Realized (gain) loss on sale of investment securities	87	(2,064)
Compensation paid with Company Common Shares	20,845	18,600
Changes in assets and liabilities:
(Increase) decrease in other assets	(13,258)	(2,096)
Increase (decrease) in accounts payable and accrued expenses	25,424	22,615
Increase (decrease) in accrued interest payable	(72)	(473)
Increase (decrease) in lease liabilities	(658)	(817)
Increase (decrease) in other liabilities	(8,047)	(23,985)
Increase (decrease) in security deposits	487	3,468
Net cash provided by operating activities	745,980	690,874
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(186,676)	(113,046)
Investment in real estate – development/other	(46,815)	(55,491)
Capital expenditures to real estate	(135,247)	(83,304)
Non-real estate capital additions	(1,043)	(981)
Interest capitalized for real estate and unconsolidated entities under development	(6,979)	(2,267)
Proceeds from disposition of real estate, net	133,916	255,922
Investments in unconsolidated entities - acquisitions	(989)
Investments in unconsolidated entities - development/other	(25,413)	(48,577)
Distributions from unconsolidated entities – return of capital	15	9
Purchase of investment securities and other investments	(2,500)	(1,034)
Proceeds from sale of investment securities	452	3,434
Net cash provided by (used for) investing activities	(271,279)	(45,335)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs		(228)
Mortgage notes payable, net:
Proceeds	22,896	14,586
Lump sum payoffs	(64,722)	(260,874)
Scheduled principal repayments	(54)	(2,985)
Line of credit and commercial paper:
Commercial paper proceeds	2,382,619	2,836,037
Commercial paper repayments	(2,328,100)	(2,966,121)
Finance ground lease principal payments	(1,329)	(1,229)
Proceeds from Employee Share Purchase Plan (ESPP)	2,124	2,378
Proceeds from exercise of EQR options	11,358	18,928
Payment of offering costs		(487)
Other financing activities, net	(31)	(31)
Acquisition of Noncontrolling Interests – Partially Owned Properties	(3,737)	(32,178)
Contributions – Noncontrolling Interests – Partially Owned Properties	9	603
Contributions – Limited Partners	1	1
Distributions:
OP Units – General Partner	(487,483)	(461,605)
Preference Units	(2,319)	(1,545)
OP Units – Limited Partners	(15,233)	(15,142)
Noncontrolling Interests – Partially Owned Properties	(3,230)	(17,232)
Net cash provided by (used for) financing activities	(487,231)	(887,124)
Net increase (decrease) in cash and cash equivalents and restricted deposits	(12,530)	(241,585)
Cash and cash equivalents and restricted deposits, beginning of period	137,172	360,236
Cash and cash equivalents and restricted deposits, end of period	124,642	118,651
Cash and cash equivalents	35,701	45,010
Restricted deposits	88,941	73,641
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	125,518	136,787
Net cash paid (received) for income and other taxes	911	687
Amortization of deferred financing costs:
Investment in real estate, net	(211)	(253)
Other assets	1,392	1,170
Mortgage notes payable, net	895	1,159
Notes, net	1,920	2,125
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	616	1,545
Notes, net	1,124	1,346
Amortization of deferred settlements on derivative instruments:
Other liabilities	(6)	(6)
Accumulated other comprehensive income	2,201	4,881
Write-off of pursuit costs:
Investment in real estate, net	316	761
Investments in unconsolidated entities	1,111	1,637
Other assets	566	117
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	1,972	1,797
Other liabilities	633	632
Realized/unrealized (gain) loss on derivative instruments:
Other assets	(3,359)
Other liabilities	(695)	1,259
Accumulated other comprehensive income	4,054	(1,259)
Interest capitalized for real estate and unconsolidated entities under development:
Investment in real estate, net	(2,988)	(675)
Investments in unconsolidated entities	(3,991)	(1,592)
Investments in unconsolidated entities - development/other:
Investments in unconsolidated entities	(24,633)	(47,887)
Other liabilities	(780)	(690)
Debt financing costs:
Mortgage notes payable, net		(228)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets	(7,105)	(224)
Lease liabilities	7,105	224
Non-cash share distribution and other transfers from unconsolidated entities:
Investments in unconsolidated entities	539	4,048
Other assets	$ (539)	$ (4,048)