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CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands | Total | ERPOP [Member] | Preferred Stock [Member] ERPOP [Member] | GENERAL PARTNER [Member] ERPOP [Member] | LIMITED PARTNERS [Member] ERPOP [Member] | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Member] ERPOP [Member] | DISTRIBUTIONS [Member] ERPOP [Member] | PARTIALLY OWNED PROPERTIES [Member] ERPOP [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of year at Dec. 31, 2023 |  |  | $ 37,280 | $ 11,042,844 | $ 202,306 | $ 5,704 |  |
Balance, beginning of year at Dec. 31, 2023 |  |  |  |  |  |  |  | $ 994
Partial redemption |  |  | (20,125) |  |  |  |  |
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  | 8,234 | (8,234) |  |  |
Exercise of EQR share options |  |  |  | 17,315 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | 2,830 |  |  |  |
EQR restricted shares |  |  |  | 11,755 | 2 |  |  |
EQR share options |  |  |  | 2,973 |  |  |  |
EQR ESPP discount |  |  |  | 589 |  |  |  |
OP Units repurchased and retired |  |  |  | (38,474) |  |  |  |
Net income available to Units - General Partner |  | $ 614,014 |  | 614,014 |  |  |  |
OP Units - General Partner distributions |  |  |  | (767,779) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (597) |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  | (64,541) |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  | 4,123 | (4,123) |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  |  | 13,215 |  |  |
Net income available to Units - Limited Partners |  | 17,290 |  |  | 17,290 |  |  |
Units - Limited Partners distributions |  |  |  |  | (23,236) |  |  |
Change in book value of Redeemable Limited Partners |  |  |  |  | 1,986 |  |  |
Unrealized holding gains (losses) arising during the period | $ (3,989) | (3,989) |  |  |  | (3,989) |  |
Losses reclassified into earnings from other comprehensive income | 1,819 | 1,819 |  |  |  | 1,819 |  |
Distributions declared per Unit outstanding |  |  |  |  |  |  | $ 2.025 |
Net income attributable to Noncontrolling Interests | 637,104 | 637,104 |  |  |  |  |  | 3,098
Contributions by Noncontrolling Interests |  |  |  |  |  |  |  | 458
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (3,215)
Other |  |  |  |  |  |  |  | (1,000)
Balance, end of period at Sep. 30, 2024 |  |  | 17,155 | 10,833,286 | 199,206 | 3,534 |  |
Balance, end of period at Sep. 30, 2024 |  |  |  |  |  |  |  | 335
Balance, beginning of year at Jun. 30, 2024 |  |  | 17,155 | 10,951,818 | 204,032 | 6,914 |  |
Balance, beginning of year at Jun. 30, 2024 |  |  |  |  |  |  |  | (295)
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  | 3,186 | (3,186) |  |  |
Exercise of EQR share options |  |  |  | 10,835 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | 381 |  |  |  |
EQR restricted shares |  |  |  | 2,372 |  |  |  |
EQR share options |  |  |  | 466 |  |  |  |
EQR ESPP discount |  |  |  | 88 |  |  |  |
Net income available to Units - General Partner |  | 143,090 |  | 143,090 |  |  |  |
OP Units - General Partner distributions |  |  |  | (256,059) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | 1 |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  | (25,483) |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  | 2,591 | (2,591) |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  |  | 2,979 |  |  |
Net income available to Units - Limited Partners |  | 4,012 |  |  | 4,012 |  |  |
Units - Limited Partners distributions |  |  |  |  | (7,361) |  |  |
Change in book value of Redeemable Limited Partners |  |  |  |  | 1,321 |  |  |
Unrealized holding gains (losses) arising during the period | (3,989) | (3,989) |  |  |  | (3,989) |  |
Losses reclassified into earnings from other comprehensive income | 609 | 609 |  |  |  | 609 |  |
Distributions declared per Unit outstanding |  |  |  |  |  |  | 0.675 |
Net income attributable to Noncontrolling Interests | 148,517 | 148,517 |  |  |  |  |  | 1,059
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (429)
Balance, end of period at Sep. 30, 2024 |  |  | 17,155 | 10,833,286 | 199,206 | 3,534 |  |
Balance, end of period at Sep. 30, 2024 |  |  |  |  |  |  |  | 335
Balance, beginning of year at Dec. 31, 2024 |  |  | 17,155 | 11,023,191 | 201,942 | 4,214 |  |
Balance, beginning of year at Dec. 31, 2024 |  |  |  |  |  |  |  | (718)
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  | 35,548 | (35,548) |  |  |
Exercise of EQR share options |  |  |  | 5,358 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | 1,963 |  |  |  |
EQR restricted shares |  |  |  | 11,838 | 5 |  |  |
EQR share options |  |  |  | 3,096 |  |  |  |
EQR ESPP discount |  |  |  | 355 |  |  |  |
OP Units repurchased and retired | 94,300 |  |  | (94,287) |  |  |  |
Net income available to Units - General Partner |  | 736,932 |  | 736,932 |  |  |  |
OP Units - General Partner distributions |  |  |  | (790,106) |  |  |  |
Offering costs |  |  |  | (763) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (502) |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  | 99,701 |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  | 33,577 | (33,577) |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  |  | 13,493 |  |  |
Net income available to Units - Limited Partners |  | 19,044 |  |  | 19,044 |  |  |
Units - Limited Partners distributions |  |  |  |  | (22,350) |  |  |
Change in book value of Redeemable Limited Partners |  |  |  |  | 57,237 |  |  |
Unrealized holding gains (losses) arising during the period | (3,550) | (3,550) |  |  |  | (3,550) |  |
Losses reclassified into earnings from other comprehensive income | 1,229 | 1,229 |  |  |  | 1,229 |  |
Distributions declared per Unit outstanding |  |  |  |  |  |  | 2.0775 |
Net income attributable to Noncontrolling Interests | 760,451 | 760,451 |  |  |  |  |  | 3,408
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (4,481)
Balance, end of period at Sep. 30, 2025 |  |  | 17,155 | 11,065,901 | 200,246 | 1,893 |  |
Balance, end of period at Sep. 30, 2025 |  |  |  |  |  |  |  | (1,791)
Balance, beginning of year at Jun. 30, 2025 |  |  | 17,155 | 10,989,451 | 202,717 | 1,615 |  |
Balance, beginning of year at Jun. 30, 2025 |  |  |  |  |  |  |  | (2,463)
Conversion of OP Units held by Limited Partners into OP Units held by General Partner |  |  |  | 26,775 | (26,775) |  |  |
Exercise of EQR share options |  |  |  | 1 |  |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  |  | 550 |  |  |  |
EQR restricted shares |  |  |  | 2,499 | 1 |  |  |
EQR share options |  |  |  | 440 |  |  |  |
EQR ESPP discount |  |  |  | 97 |  |  |  |
OP Units repurchased and retired |  |  |  | (94,287) |  |  |  |
Net income available to Units - General Partner |  | 288,695 |  | 288,695 |  |  |  |
OP Units - General Partner distributions |  |  |  | (263,678) |  |  |  |
Offering costs |  |  |  | (282) |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | 238 |  |  |  |
Change in market value of Redeemable Limited Partners |  |  |  | 80,133 |  |  |  |
Adjustment for Limited Partners ownership in Operating Partnership |  |  |  | 35,269 | (35,269) |  |  |
Equity compensation associated with Units - Limited Partners |  |  |  |  | 2,900 |  |  |
Net income available to Units - Limited Partners |  | 6,716 |  |  | 6,716 |  |  |
Units - Limited Partners distributions |  |  |  |  | (6,191) |  |  |
Change in book value of Redeemable Limited Partners |  |  |  |  | 56,147 |  |  |
Losses reclassified into earnings from other comprehensive income | 278 | 278 |  |  |  | 278 |  |
Distributions declared per Unit outstanding |  |  |  |  |  |  | $ 0.6925 |
Net income attributable to Noncontrolling Interests | $ 296,868 | $ 296,868 |  |  |  |  |  | 1,101
Distributions to Noncontrolling Interests |  |  |  |  |  |  |  | (429)
Balance, end of period at Sep. 30, 2025 |  |  | $ 17,155 | $ 11,065,901 | $ 200,246 | $ 1,893 |  |
Balance, end of period at Sep. 30, 2025 |  |  |  |  |  |  |  | $ (1,791)

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