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Noncontrolling Interests on the Company's Consolidated Financial Statements - Schedule of Common Unit Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Rollforward Analysis of Preferred Unit Activity          
Contributions to consolidated joint venture interests $ 1,310 $ 1,823 $ 4,747 $ 1,823  
Redemption of preferred units (15,631)   (15,631) (5,674)  
SL Green Operating Partnership          
Rollforward Analysis of Preferred Unit Activity          
Contributions to consolidated joint venture interests 1,310 $ 1,823 4,747 1,823  
Redemption of preferred units       (5,674)  
SL Green Operating Partnership | Preferred stock          
Rollforward Analysis of Preferred Unit Activity          
Balance at beginning of period     164,210 $ 166,501 $ 166,501
Contributions to consolidated joint venture interests     0   0
Redemption of preferred units     0   (2,503)
Dividends paid on preferred units     (3,787)   (4,453)
Accrued dividends on preferred units     3,793   4,665
Balance at end of period $ 164,216   $ 164,216   $ 164,210