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Noncontrolling Interests on the Company's Consolidated Financial Statements - Common Unit Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Rollforward Analysis of Preferred Unit Activity        
Redemption of preferred units $ (29,817)   $ (29,817)  
SL Green Operating Partnership        
Rollforward Analysis of Preferred Unit Activity        
Redemption of preferred units $ (29,817)   (29,817)  
SL Green Operating Partnership | Series I Preferred Units        
Rollforward Analysis of Preferred Unit Activity        
Balance at beginning of period   $ 177,943 $ 196,075 $ 196,075
Issuance of preferred units   0   0
Redemption of preferred units   (11,700)   (17,967)
Dividends paid on preferred units   (4,582)   (6,198)
Accrued dividends on preferred units   4,840   6,033
Balance at end of period   $ 166,501   $ 177,943