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Noncontrolling Interests on the Company's Consolidated Financial Statements - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Distributions $ (11,053) $ (2,777) $ (4,699)
Acquisition of subsidiary interest from noncontrolling interest (9,216)   (29,817)
Net income (loss) 497 (37,465) (5,794)
Accumulated other comprehensive income (loss) allocation $ 151 $ (1,960) 5,827
SL Green Operating Partnership      
Organization      
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares) 4,509,953 3,949,448  
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Distributions $ (11,053) $ (2,777) (4,699)
Acquisition of subsidiary interest from noncontrolling interest (9,216)   (29,817)
Accumulated other comprehensive income (loss) allocation $ 151 $ (1,960) 5,827
SL Green Operating Partnership | Operating Partnership      
Organization      
Noncontrolling interest in the operating partnership (as a percent) 5.97% 5.75%  
SL Green Operating Partnership | Series A Preferred Units      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Stated Distribution Rate 6.00%    
Preferred Units, shares authorized (in shares) 109,161    
Number of preferred units issued (in shares) 109,161    
Preferred units, shares outstanding (in shares) 109,161    
Annual dividends on preferred units (in dollars per share) $ 60.0000    
Liquidation preference of preferred units (in dollars per share) 1,000    
Conversion Price Per Unit (in dollars per share) $ 0    
SL Green Operating Partnership | Series F Preferred Units      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Stated Distribution Rate 7.00%    
Preferred Units, shares authorized (in shares) 60    
Number of preferred units issued (in shares) 60    
Preferred units, shares outstanding (in shares) 60    
Annual dividends on preferred units (in dollars per share) $ 70.0000    
Liquidation preference of preferred units (in dollars per share) 1,000    
Conversion Price Per Unit (in dollars per share) $ 29.12    
SL Green Operating Partnership | Series K Preferred Units      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Stated Distribution Rate 3.50%    
Preferred Units, shares authorized (in shares) 700,000    
Number of preferred units issued (in shares) 563,954    
Preferred units, shares outstanding (in shares) 341,677    
Annual dividends on preferred units (in dollars per share) $ 0.8750    
Liquidation preference of preferred units (in dollars per share) 25.00    
Conversion Price Per Unit (in dollars per share) $ 134.67    
SL Green Operating Partnership | Series L Preferred Units      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Stated Distribution Rate 4.00%    
Preferred Units, shares authorized (in shares) 500,000    
Number of preferred units issued (in shares) 378,634    
Preferred units, shares outstanding (in shares) 272,783    
Annual dividends on preferred units (in dollars per share) $ 1.0000    
Liquidation preference of preferred units (in dollars per share) 25.00    
Conversion Price Per Unit (in dollars per share) $ 0    
SL Green Operating Partnership | Series R Preferred Units      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Stated Distribution Rate 3.50%    
Preferred Units, shares authorized (in shares) 400,000    
Number of preferred units issued (in shares) 400,000    
Preferred units, shares outstanding (in shares) 400,000    
Annual dividends on preferred units (in dollars per share) $ 0.8750    
Liquidation preference of preferred units (in dollars per share) 25.00    
Conversion Price Per Unit (in dollars per share) $ 154.89    
SL Green Operating Partnership | Series S Preferred Units      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Stated Distribution Rate 4.00%    
Preferred Units, shares authorized (in shares) 1,077,280    
Number of preferred units issued (in shares) 1,077,280    
Preferred units, shares outstanding (in shares) 1,077,280    
Annual dividends on preferred units (in dollars per share) $ 1.0000    
Liquidation preference of preferred units (in dollars per share) 25.00    
Conversion Price Per Unit (in dollars per share) $ 0    
SL Green Operating Partnership | Series V Preferred Stock      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Stated Distribution Rate 5.00%    
Preferred Units, shares authorized (in shares) 40,000    
Number of preferred units issued (in shares) 40,000    
Preferred units, shares outstanding (in shares) 40,000    
Annual dividends on preferred units (in dollars per share) $ 1.2500    
Liquidation preference of preferred units (in dollars per share) 25.00    
Conversion Price Per Unit (in dollars per share) $ 0    
SL Green Operating Partnership | Series W      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Preferred Units, shares authorized (in shares) 1    
Number of preferred units issued (in shares) 1    
Preferred units, shares outstanding (in shares) 1    
Preferred stock, dividend, multiplier per common unit distribution 1,350    
Partnership Interest      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Balance at beginning of period $ 238,051 $ 269,993  
Distributions (13,915) (14,779)  
Issuance of common units 20,790 25,365  
Acquisition of subsidiary interest from noncontrolling interest (28,663) (18,589)  
Net income (loss) 497 (37,465)  
Accumulated other comprehensive income (loss) allocation 151 (1,960)  
Fair value adjustment 72,030 15,486  
Balance at end of period $ 288,941 $ 238,051 $ 269,993