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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Capital:    
General partner operating partnership units, outstanding (in shares) 171,600,000  
Limited partner operating partnership units, outstanding (in shares) 113,700,000  
Private Perpetual Preferred Units, Series 2019    
Capital:    
Private perpetual preferred units, liquidation preference per share (in dollars per share) $ 13.52 $ 13.52
Private perpetual preferred units, issued (in shares) 4,664,038 4,610,383
Private perpetual preferred units, outstanding (in shares) 4,664,038 4,610,383
Private Perpetual Preferred Units, Series 2014    
Capital:    
Private perpetual preferred units, liquidation preference per share (in dollars per share) $ 16.62 $ 16.62
Private perpetual preferred units, issued (in shares) 1,560,360 1,560,360
Private perpetual preferred units, outstanding (in shares) 1,560,360 1,560,360
Series PR Operating Partnership Units    
Capital:    
Limited partner operating partnership units, outstanding (in shares) 80,355,297 81,387,763
Series ES Operating Partnership Units Limited Partners    
Capital:    
Limited partner operating partnership units, outstanding (in shares) 23,677,975 25,809,604
Series 60 Operating Partnership Units Limited Partners    
Capital:    
Limited partner operating partnership units, outstanding (in shares) 6,424,567 7,025,089
Series 250 Operating Partnership Units Limited Partners    
Capital:    
Limited partner operating partnership units, outstanding (in shares) 3,255,480 3,535,197
ESRT | Series PR Operating Partnership Units    
Capital:    
General partner operating partnership units, outstanding (in shares) 2,852,787 2,996,520
Limited partner operating partnership units, outstanding (in shares) 168,712,617 178,897,876