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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2021
Dec. 31, 2020
Private perpetual preferred units, series 2019    
Capital    
Private perpetual preferred units, liquidation preference (in USD per share) $ 13.52 $ 13.52
Private perpetual preferred units, issued (in shares) 4,664,038 4,664,000
Private perpetual preferred units, outstanding (in shares) 4,664,000 4,664,000
Private perpetual preferred units, series 2014    
Capital    
Private perpetual preferred units, liquidation preference (in USD per share) $ 16.62 $ 16.62
Private perpetual preferred units, issued (in shares) 1,560,000 1,560,000
Private perpetual preferred units, outstanding (in shares) 1,560,000 1,560,000
Series PR Operating Partnership Units    
Capital    
Limited partner operating partnership units, outstanding (in shares) 80,241,000 80,355,000
Series ES operating partnership units    
Capital    
Limited partner operating partnership units, outstanding (in shares) 22,923,000 23,678,000
Series 60 operating partnership units    
Capital    
Limited partner operating partnership units, outstanding (in shares) 6,112,000 6,425,000
Series 250 operating partnership units    
Capital    
Limited partner operating partnership units, outstanding (in shares) 3,045,000 3,255,000
ESRT | Series PR Operating Partnership Units    
Capital    
General partner operating partnership units, outstanding (in shares) 2,857,000 2,853,000
Limited partner operating partnership units, outstanding (in shares) 170,543,000 168,713,000