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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Distributions $ (4,699) $ (6,631) $ (78,855)
Acquisition of subsidiary interest from noncontrolling interest (29,817)   (1,536)
Net (loss) income (5,794) 25,457 20,016
Accumulated other comprehensive income allocation $ 5,827 1,042 (2,299)
Series B Preferred Stock      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Preferred units, issued (in shares) 0    
SL Green Operating Partnership      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Balance at beginning of period $ 344,252 358,262  
Distributions (16,272) (15,749)  
Issuance of common units 22,855 18,678  
Acquisition of subsidiary interest from noncontrolling interest (40,901) (53,289)  
Net (loss) income (5,794) 25,457  
Accumulated other comprehensive income allocation 5,827 1,042  
Fair value adjustment (39,974) 9,851  
Balance at end of period $ 269,993 $ 344,252 358,262
SL Green Operating Partnership      
Organization      
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares) 3,670,343 3,781,565  
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) 3,670,343    
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Distributions $ (4,699) $ (6,631) (78,855)
Acquisition of subsidiary interest from noncontrolling interest (29,817)   (1,536)
Accumulated other comprehensive income allocation $ 5,827 $ 1,042 $ (2,299)
SL Green Operating Partnership | Operating Partnership      
Organization      
Noncontrolling interest in the operating partnership (as a percent) 5.39% 5.57%  
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 3.50%    
Preferred Units, shares authorized (in shares) 109,161    
Number of preferred units issued (in shares) 109,161    
Number of Units Outstanding (in shares) 109,161    
Annual dividends on preferred units (in dollars per share) $ 35.0000    
Liquidation preference of preferred units (in dollars per share) 1,000    
Conversion Price Per Unit (in dollars per share) $ 0    
Number of company common stock issued on conversion of Series B preferred units 6.71348    
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    
Number of Units 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    
Number of Units 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    
Number of Units Outstanding (in shares) 372,634    
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 P 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) 200,000    
Number of preferred units issued (in shares) 200,000    
Number of Units Outstanding (in shares) 200,000    
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 Q 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) 268,000    
Number of preferred units issued (in shares) 268,000    
Number of Units Outstanding (in shares) 268,000    
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) $ 148.95    
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    
Number of Units 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    
Number of Units 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 3.50%    
Preferred Units, shares authorized (in shares) 40,000    
Number of preferred units issued (in shares) 40,000    
Number of Units Outstanding (in shares) 40,000    
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) $ 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    
Number of Units Outstanding (in shares) 1    
Preferred stock, dividend, multiplier per common unit distribution 1,350