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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)