CONSOLIDATED STATEMENTS OF CASH FLOWS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 305,032	$ 220,071
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	225,695	215,830
Amortization of deferred financing costs	1,918	1,979
Amortization of discounts and premiums on debt	1,267	868
Amortization of deferred settlements on derivative instruments	608	1,092
Amortization of right-of-use assets	3,231	3,150
Write-off of pursuit costs	548	1,332
(Income) loss from investments in unconsolidated entities	1,698	1,382
Distributions from unconsolidated entities – return on capital	159	151
Net (gain) loss on sales of real estate properties	(188,185)	(100,209)
Realized (gain) loss on investment securities		87
Unrealized (gain) loss on investment securities	(7,061)
Compensation paid with Company Common Shares	9,469	9,044
Changes in assets and liabilities:
(Increase) decrease in other assets	22,737	26,257
Increase (decrease) in accounts payable and accrued expenses	54,289	45,357
Increase (decrease) in accrued interest payable	(16,526)	(16,534)
Increase (decrease) in lease liabilities	(499)	(334)
Increase (decrease) in other liabilities	7,011	(16,032)
Increase (decrease) in security deposits	(360)	(212)
Net cash provided by operating activities	421,031	393,279
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(837)
Investment in real estate – development/other	(25,491)	(16,786)
Capital expenditures to real estate	(73,520)	(55,392)
Non-real estate capital additions	(534)	(600)
Interest capitalized for real estate and unconsolidated entities under development	(3,150)	(3,393)
Proceeds from disposition of real estate, net	247,334	133,916
Investments in unconsolidated entities - development/other	(7,812)	(14,480)
Distributions from unconsolidated entities – return of capital	16	6
Proceeds from sale of investment securities		452
Net cash provided by (used for) investing activities	136,006	43,723
Mortgage notes payable, net:
Proceeds	0	14,090
Lump sum payoffs	0
Scheduled principal repayments		(40)
Line of credit and commercial paper:
Commercial paper proceeds	1,186,790	1,323,145
Commercial paper repayments	(1,370,000)	(1,453,100)
Finance ground lease principal payments	(719)	(665)
Proceeds from EQR's Employee Share Purchase Plan (ESPP)	1,644	1,452
Proceeds from exercise of EQR options	4,401	8,112
Redemption of Preference Units	(20,125)
Other financing activities, net	(7)
Contributions – Noncontrolling Interests – Partially Owned Properties	235
Contributions – Limited Partners	2
Distributions:
OP Units – General Partner	(251,334)	(236,561)
Preference Units	(964)	(1,544)
OP Units – Limited Partners	(8,154)	(7,380)
Noncontrolling Interests – Partially Owned Properties	(2,323)	(2,598)
Net cash provided by (used for) financing activities	(500,472)	(355,089)
Net increase (decrease) in cash and cash equivalents and restricted deposits	56,565	81,913
Cash and cash equivalents and restricted deposits, beginning of period	139,995	137,172
Cash and cash equivalents and restricted deposits, end of period	196,560	219,085
Cash and cash equivalents	44,535	133,460
Restricted deposits	152,025	85,625
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	77,149	79,693
Net cash paid (received) for income and other taxes	410	348
Amortization of deferred financing costs:
Investment in real estate, net		(127)
Other assets	696	697
Mortgage notes payable, net	262	449
Notes, net	960	960
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	706	306
Notes, net	561	562
Amortization of deferred settlements on derivative instruments:
Other liabilities	(2)	(3)
Accumulated other comprehensive income	610	1,095
Write-off of pursuit costs:
Investment in real estate, net	128	225
Investments in unconsolidated entities	355	649
Other assets	65	458
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	1,390	1,071
Other liabilities	308	311
Realized/unrealized (gain) loss on derivative instruments:
Other assets		7,410
Other liabilities		2,370
Accumulated other comprehensive income		(9,780)
Interest capitalized for real estate and unconsolidated entities under development:
Investment in real estate, net	(1,159)	(1,422)
Investments in unconsolidated entities	(1,991)	(1,971)
Investments in unconsolidated entities - development/other:
Investments in unconsolidated entities	(7,152)	(13,700)
Other liabilities	(660)	(780)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets		(7,105)
Lease liabilities		7,105
Non-cash share distribution and other transfers from unconsolidated entities:
Investments in unconsolidated entities		539
Other assets		(539)
Non-cash change in Supplemental Executive Retirement Plan (SERP) balances:
Other assets	4,561	8,373
Other liabilities	(4,334)	(8,864)
Paid in capital	(227)	491
ERPOP [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	305,032	220,071
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	225,695	215,830
Amortization of deferred financing costs	1,918	1,979
Amortization of discounts and premiums on debt	1,267	868
Amortization of deferred settlements on derivative instruments	608	1,092
Amortization of right-of-use assets	3,231	3,150
Write-off of pursuit costs	548	1,332
(Income) loss from investments in unconsolidated entities	1,698	1,382
Distributions from unconsolidated entities – return on capital	159	151
Net (gain) loss on sales of real estate properties	(188,185)	(100,209)
Realized (gain) loss on investment securities		87
Unrealized (gain) loss on investment securities	(7,061)
Compensation paid with Company Common Shares	9,469	9,044
Changes in assets and liabilities:
(Increase) decrease in other assets	22,737	26,257
Increase (decrease) in accounts payable and accrued expenses	54,289	45,357
Increase (decrease) in accrued interest payable	(16,526)	(16,534)
Increase (decrease) in lease liabilities	(499)	(334)
Increase (decrease) in other liabilities	7,011	(16,032)
Increase (decrease) in security deposits	(360)	(212)
Net cash provided by operating activities	421,031	393,279
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(837)
Investment in real estate – development/other	(25,491)	(16,786)
Capital expenditures to real estate	(73,520)	(55,392)
Non-real estate capital additions	(534)	(600)
Interest capitalized for real estate and unconsolidated entities under development	(3,150)	(3,393)
Proceeds from disposition of real estate, net	247,334	133,916
Investments in unconsolidated entities - development/other	(7,812)	(14,480)
Distributions from unconsolidated entities – return of capital	16	6
Proceeds from sale of investment securities		452
Net cash provided by (used for) investing activities	136,006	43,723
Mortgage notes payable, net:
Proceeds		14,090
Scheduled principal repayments		(40)
Line of credit and commercial paper:
Commercial paper proceeds	1,186,790	1,323,145
Commercial paper repayments	(1,370,000)	(1,453,100)
Finance ground lease principal payments	(719)	(665)
Proceeds from EQR's Employee Share Purchase Plan (ESPP)	1,644	1,452
Proceeds from exercise of EQR options	4,401	8,112
OP Units repurchased and retired	(38,474)
Redemption of Preference Units	(20,125)
Premium on redemption of Preference Units	(1,444)
Other financing activities, net	(7)
Contributions – Noncontrolling Interests – Partially Owned Properties	235
Contributions – Limited Partners	2
Distributions:
OP Units – General Partner	(251,334)	(236,561)
Preference Units	(964)	(1,544)
OP Units – Limited Partners	(8,154)	(7,380)
Noncontrolling Interests – Partially Owned Properties	(2,323)	(2,598)
Net cash provided by (used for) financing activities	(500,472)	(355,089)
Net increase (decrease) in cash and cash equivalents and restricted deposits	56,565	81,913
Cash and cash equivalents and restricted deposits, beginning of period	139,995	137,172
Cash and cash equivalents and restricted deposits, end of period	196,560	219,085
Cash and cash equivalents	44,535	133,460
Restricted deposits	152,025	85,625
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	77,149	79,693
Net cash paid (received) for income and other taxes	410	348
Amortization of deferred financing costs:
Investment in real estate, net		(127)
Other assets	696	697
Mortgage notes payable, net	262	449
Notes, net	960	960
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	706	306
Notes, net	561	562
Amortization of deferred settlements on derivative instruments:
Other liabilities	(2)	(3)
Accumulated other comprehensive income	610	1,095
Write-off of pursuit costs:
Investment in real estate, net	128	225
Investments in unconsolidated entities	355	649
Other assets	65	458
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	1,390	1,071
Other liabilities	308	311
Realized/unrealized (gain) loss on derivative instruments:
Other assets		7,410
Other liabilities		2,370
Accumulated other comprehensive income		(9,780)
Interest capitalized for real estate and unconsolidated entities under development:
Investment in real estate, net	(1,159)	(1,422)
Investments in unconsolidated entities	(1,991)	(1,971)
Investments in unconsolidated entities - development/other:
Investments in unconsolidated entities	(7,152)	(13,700)
Other liabilities	(660)	(780)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets		(7,105)
Lease liabilities		7,105
Non-cash share distribution and other transfers from unconsolidated entities:
Investments in unconsolidated entities		539
Other assets		(539)
Non-cash change in Supplemental Executive Retirement Plan (SERP) balances:
Other assets	4,561	8,373
Other liabilities	(4,334)	(8,864)
Paid in capital	$ (227)	$ 491