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Capital - Summary of ESRT restricted stock and LTIP unit activity (Details)
 12 Months Ended
Dec. 31, 2022
$ / shares
shares
Weighted Average Grant Fair Value  
Unvested, beginning balance (in dollars per share) | $ / shares $ 7.02
Vested (in dollars per share) | $ / shares 9.28
Granted (in dollars per share) | $ / shares 7.21
Forfeited or unearned (in dollars per share) | $ / shares 6.84
Unvested, ending balance (in dollars per share) | $ / shares $ 6.69
ESRT Restricted Stock  
Restricted Stock and LTIP Units  
Unvested, beginning balance (in shares) 214,408
Vested (in shares) (69,545)
Granted (in shares) 232,448
Forfeited or unearned (in shares) (18,018)
Unvested, ending balance (in shares) 359,293
Time-based LTIPs  
Restricted Stock and LTIP Units  
Unvested, beginning balance (in shares) 2,499,592
Vested (in shares) (1,300,504)
Granted (in shares) 1,514,434
Forfeited or unearned (in shares) 0
Unvested, ending balance (in shares) 2,713,522
Market-based LTIPs  
Restricted Stock and LTIP Units  
Unvested, beginning balance (in shares) 5,039,134
Vested (in shares) (113,576)
Granted (in shares) 780,155
Forfeited or unearned (in shares) (1,635,176)
Unvested, ending balance (in shares) 4,070,537
Performance-based LTIPs  
Restricted Stock and LTIP Units  
Unvested, beginning balance (in shares) 0
Vested (in shares) (35,695)
Granted (in shares) 578,943
Forfeited or unearned (in shares) (32,259)
Unvested, ending balance (in shares) 510,989