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CONSOLIDATED STATEMENTS OF CASH FLOWS OF ERP OPERATING LIMITED PARTNERSHIP - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 1,070,975	$ 868,488	$ 806,995
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	952,191	888,709	882,168
Amortization of deferred financing costs	7,834	8,941	8,729
Amortization of discounts and premiums on debt	5,151	4,091	5,004
Amortization of deferred settlements on derivative instruments	2,488	3,725	11,059
Amortization of right-of-use assets	14,548	12,795	12,157
Write-off of pursuit costs	5,155	3,647	4,780
(Income) loss from investments in unconsolidated entities	8,974	5,378	5,031
Distributions from unconsolidated entities – return on capital	555	559	398
Net (gain) loss on sales of real estate properties	(546,797)	(282,539)	(304,325)
Realized (gain) loss on investment securities	1,992	(1,504)	(2,061)
Unrealized (gain) loss on investment securities	(19,880)	(13,466)
Compensation paid with Company Common Shares	31,287	31,815	29,513
Changes in assets and liabilities:
(Increase) decrease in other assets	(11,813)	(10,203)	10,893
Increase (decrease) in accounts payable and accrued expenses	3,249	8,911	(266)
Increase (decrease) in accrued interest payable	8,460	(594)	(3,200)
Increase (decrease) in lease liabilities	(3,863)	(1,551)	(1,524)
Increase (decrease) in other liabilities	36,668	5,358	(13,394)
Increase (decrease) in security deposits	6,433	238	2,799
Net cash provided by operating activities	1,573,607	1,532,798	1,454,756
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(1,595,100)	(324,497)	(113,046)
Investment in real estate – development/other	(129,822)	(78,197)	(109,345)
Capital expenditures to real estate	(301,434)	(319,342)	(221,086)
Non-real estate capital additions	(2,766)	(1,851)	(4,050)
Interest capitalized for real estate and unconsolidated entities under development	(14,489)	(12,347)	(7,105)
Proceeds from disposition of real estate, net	960,398	374,018	720,302
Investments in unconsolidated entities – acquisitions	(31,286)	(2,800)	(49,855)
Investments in unconsolidated entities - development/other	(78,435)	(47,180)	(109,846)
Distributions from unconsolidated entities – return of capital	1,409	42	300
Purchase of investment securities and other investments		(2,500)	(2,061)
Proceeds from sale of investment securities	15,041	3,042	3,584
Consolidation of previously unconsolidated entities		2,108
Net cash provided by (used for) investing activities	(1,176,484)	(409,504)	107,792
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(5,307)	(4,106)	(9,894)
Mortgage notes payable, net:
Proceeds		572,896	48,054
Lump sum payoffs		(932,598)	(286,461)
Scheduled principal repayments	(6,100)	(3,354)	(3,392)
Notes, net:
Proceeds	597,954
Lump sum payoffs			(500,000)
Line of credit and commercial paper:
Line of credit proceeds	392,000
Line of credit repayments	(392,000)
Commercial paper proceeds	33,116,303	6,124,068	6,036,083
Commercial paper repayments	(32,981,755)	(5,844,892)	(6,221,158)
Proceeds from (payments on) settlement of derivative instruments	(3,989)	25,169
Finance ground lease principal payments	(2,880)	(2,662)	(2,463)
Proceeds from sale of OP Units			139,623
Proceeds from Employee Share Purchase Plan (ESPP)	3,522	3,517	4,178
Proceeds from exercise of EQR options	23,000	23,632	25,069
Redemption of Preference Units	(20,125)
Premium on redemption of Preference Units	(1,444)
Payment of offering costs			(783)
Other financing activities, net	(94)	(75)	(63)
Acquisition of Noncontrolling Interests - Partially Owned Properties	(3,129)	(3,737)	(32,178)
Contributions – Noncontrolling Interests – Partially Owned Properties	583	9	603
Contributions – Limited Partners	2	1	1
Distributions:
OP Units – General Partner	(1,019,050)	(990,148)	(931,783)
Preference Units	(2,386)	(3,090)	(2,318)
OP Units – Limited Partners	(30,419)	(30,253)	(30,324)
Noncontrolling Interests – Partially Owned Properties	(3,164)	(5,743)	(18,406)
Net cash provided by (used for) financing activities	(376,952)	(1,120,471)	(1,785,612)
Net increase (decrease) in cash and cash equivalents and restricted deposits	20,171	2,823	(223,064)
Cash and cash equivalents and restricted deposits, beginning of year	139,995	137,172	360,236
Cash and cash equivalents and restricted deposits, end of year	160,166	139,995	137,172
Cash and cash equivalents	62,302	50,743	53,869
Restricted deposits	97,864	89,252	83,303
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	241,034	248,990	267,612
Net cash paid (received) for income and other taxes	1,339	1,091	748
Real estate acquisitions/dispositions/other:
Mortgage loans assumed		42,256
Amortization of deferred financing costs:
Investment in real estate, net		(211)	(506)
Other assets	2,785	2,785	2,768
Mortgage notes payable, net	1,047	2,527	2,080
Notes, net	4,002	3,840	4,387
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	2,841	1,843	2,184
Notes, net	2,310	2,248	2,820
Amortization of deferred settlements on derivative instruments:
Other liabilities	(11)	(12)	(12)
Accumulated other comprehensive income	2,499	3,737	11,071
Write-off of pursuit costs:
Investment in real estate, net	2,809	527	1,150
Investments in unconsolidated entities	1,717	2,186	2,898
Other assets	629	934	732
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	7,739	4,132	3,778
Other liabilities	1,235	1,246	1,253
Realized/unrealized (gain) loss on derivative instruments:
Other assets		(3,749)	(21,865)
Other liabilities	3,989	(765)	1,211
Accumulated other comprehensive income	(3,989)	4,514	20,654
Investment in real estate - acquisitions:
Investment in real estate, net	(1,573,920)	(324,497)	(113,046)
Right-of-use assets	(12,727)
Other assets	(8,453)
Interest capitalized for real estate and unconsolidated entities under development:
Investment in real estate, net	6,328	4,010	2,365
Investments in unconsolidated entities	(8,161)	(8,337)	(4,740)
Investments in unconsolidated entities - development/other:
Investments in unconsolidated entities	(76,455)	(45,770)	(108,556)
Other liabilities	(1,980)	(1,410)	(1,290)
Consolidation of previously unconsolidated entities:
Investment in real estate, net		(50,315)
Investments in unconsolidated entities		46,327
Other liabilities		2,000
Noncontrolling Interests - Partially Owned Properties		4,021
Debt financing costs:
Other assets			(9,566)
Mortgage notes payable, net		(4,106)	(228)
Notes, net	(5,307)		(100)
Proceeds from (payments on) settlement of derivative instruments:
Other assets		25,613
Other liabilities	(3,989)	(444)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets		(7,105)	(400)
Lease liabilities		7,105	400
Non-cash share distribution and other transfers from unconsolidated entities:
Investments in unconsolidated entities		636	4,201
Other assets		(636)	(4,201)
Non-cash change in Supplemental Executive Retirement Plan (SERP) balances:
Other assets	(1,457)	24,767	31,405
Other liabilities	2,051	(56,845)	(31,136)
Paid in capital	(594)	32,078	(269)
ERPOP [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	1,070,975	868,488	806,995
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	952,191	888,709	882,168
Amortization of deferred financing costs	7,834	8,941	8,729
Amortization of discounts and premiums on debt	5,151	4,091	5,004
Amortization of deferred settlements on derivative instruments	2,488	3,725	11,059
Amortization of right-of-use assets	14,548	12,795	12,157
Write-off of pursuit costs	5,155	3,647	4,780
(Income) loss from investments in unconsolidated entities	8,974	5,378	5,031
Distributions from unconsolidated entities – return on capital	555	559	398
Net (gain) loss on sales of real estate properties	(546,797)	(282,539)	(304,325)
Realized (gain) loss on investment securities	1,992	(1,504)	(2,061)
Unrealized (gain) loss on investment securities	(19,880)	(13,466)
Compensation paid with Company Common Shares	31,287	31,815	29,513
Changes in assets and liabilities:
(Increase) decrease in other assets	(11,813)	(10,203)	10,893
Increase (decrease) in accounts payable and accrued expenses	3,249	8,911	(266)
Increase (decrease) in accrued interest payable	8,460	(594)	(3,200)
Increase (decrease) in lease liabilities	(3,863)	(1,551)	(1,524)
Increase (decrease) in other liabilities	36,668	5,358	(13,394)
Increase (decrease) in security deposits	6,433	238	2,799
Net cash provided by operating activities	1,573,607	1,532,798	1,454,756
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(1,595,100)	(324,497)	(113,046)
Investment in real estate – development/other	(129,822)	(78,197)	(109,345)
Capital expenditures to real estate	(301,434)	(319,342)	(221,086)
Non-real estate capital additions	(2,766)	(1,851)	(4,050)
Interest capitalized for real estate and unconsolidated entities under development	(14,489)	(12,347)	(7,105)
Proceeds from disposition of real estate, net	960,398	374,018	720,302
Investments in unconsolidated entities – acquisitions	(31,286)	(2,800)	(49,855)
Investments in unconsolidated entities - development/other	(78,435)	(47,180)	(109,846)
Distributions from unconsolidated entities – return of capital	1,409	42	300
Purchase of investment securities and other investments		(2,500)	(2,061)
Proceeds from sale of investment securities	15,041	3,042	3,584
Consolidation of previously unconsolidated entities		2,108
Net cash provided by (used for) investing activities	(1,176,484)	(409,504)	107,792
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(5,307)	(4,106)	(9,894)
Mortgage notes payable, net:
Proceeds		572,896	48,054
Lump sum payoffs		(932,598)	(286,461)
Scheduled principal repayments	(6,100)	(3,354)	(3,392)
Notes, net:
Proceeds	597,954
Lump sum payoffs			(500,000)
Line of credit and commercial paper:
Line of credit proceeds	392,000
Line of credit repayments	(392,000)
Commercial paper proceeds	33,116,303	6,124,068	6,036,083
Commercial paper repayments	(32,981,755)	(5,844,892)	(6,221,158)
Proceeds from (payments on) settlement of derivative instruments	(3,989)	25,169
Finance ground lease principal payments	(2,880)	(2,662)	(2,463)
Proceeds from sale of OP Units			139,623
Proceeds from Employee Share Purchase Plan (ESPP)	3,522	3,517	4,178
Proceeds from exercise of EQR options	23,000	23,632	25,069
OP Units repurchased and retired	(38,474)	(49,105)
Redemption of Preference Units	(20,125)
Premium on redemption of Preference Units	(1,444)
Payment of offering costs			(783)
Other financing activities, net	(94)	(75)	(63)
Acquisition of Noncontrolling Interests - Partially Owned Properties	(3,129)	(3,737)	(32,178)
Contributions – Noncontrolling Interests – Partially Owned Properties	583	9	603
Contributions – Limited Partners	2	1	1
Distributions:
OP Units – General Partner	(1,019,050)	(990,148)	(931,783)
Preference Units	(2,386)	(3,090)	(2,318)
OP Units – Limited Partners	(30,419)	(30,253)	(30,324)
Noncontrolling Interests – Partially Owned Properties	(3,164)	(5,743)	(18,406)
Net cash provided by (used for) financing activities	(376,952)	(1,120,471)	(1,785,612)
Net increase (decrease) in cash and cash equivalents and restricted deposits	20,171	2,823	(223,064)
Cash and cash equivalents and restricted deposits, beginning of year	139,995	137,172	360,236
Cash and cash equivalents and restricted deposits, end of year	160,166	139,995	137,172
Cash and cash equivalents	62,302	50,743	53,869
Restricted deposits	97,864	89,252	83,303
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	241,034	248,990	267,612
Net cash paid (received) for income and other taxes	1,339	1,091	748
Real estate acquisitions/dispositions/other:
Mortgage loans assumed		42,256
Amortization of deferred financing costs:
Investment in real estate, net		(211)	(506)
Other assets	2,785	2,785	2,768
Mortgage notes payable, net	1,047	2,527	2,080
Notes, net	4,002	3,840	4,387
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	2,841	1,843	2,184
Notes, net	2,310	2,248	2,820
Amortization of deferred settlements on derivative instruments:
Other liabilities	(11)	(12)	(12)
Accumulated other comprehensive income	2,499	3,737	11,071
Write-off of pursuit costs:
Investment in real estate, net	2,809	527	1,150
Investments in unconsolidated entities	1,717	2,186	2,898
Other assets	629	934	732
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	7,739	4,132	3,778
Other liabilities	1,235	1,246	1,253
Realized/unrealized (gain) loss on derivative instruments:
Other assets		(3,749)	(21,865)
Other liabilities	3,989	(765)	1,211
Accumulated other comprehensive income	(3,989)	4,514	20,654
Investment in real estate - acquisitions:
Investment in real estate, net	(1,573,920)	(324,497)	(113,046)
Right-of-use assets	(12,727)
Other assets	(8,453)
Interest capitalized for real estate and unconsolidated entities under development:
Investment in real estate, net	(6,328)	(4,010)	(2,365)
Investments in unconsolidated entities	(8,161)	(8,337)	(4,740)
Investments in unconsolidated entities - development/other:
Investments in unconsolidated entities	(76,455)	(45,770)	(108,556)
Other liabilities	(1,980)	(1,410)	(1,290)
Consolidation of previously unconsolidated entities:
Investment in real estate, net		(50,315)
Investments in unconsolidated entities		46,327
Accounts payable and accrued expenses		75
Other liabilities		2,000
Noncontrolling Interests - Partially Owned Properties		4,021
Debt financing costs:
Other assets			(9,566)
Mortgage notes payable, net		(4,106)	(228)
Notes, net	(5,307)		(100)
Proceeds from (payments on) settlement of derivative instruments:
Other assets		25,613
Other liabilities	(3,989)	(444)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets		(7,105)	(400)
Lease liabilities		7,105	400
Non-cash share distribution and other transfers from unconsolidated entities:
Investments in unconsolidated entities		636	4,201
Other assets		(636)	(4,201)
Non-cash change in Supplemental Executive Retirement Plan (SERP) balances:
Other assets	(1,457)	24,767	31,405
Other liabilities	2,051	(56,845)	(31,136)
Paid in capital	$ (594)	$ 32,078	$ (269)

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