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Noncontrolling Interests on the Company's Consolidated Financial Statements - Additional Information (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
shares
$ / shares
Dec. 31, 2019
USD ($)
unit
Dec. 31, 2018
USD ($)
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Distributions | $ $ (78,855) $ (478) $ (8,364)
Acquisition of subsidiary interest from noncontrolling interest | $ (1,536) (25,845)  
Net income | $ 20,016 13,301 12,216
Accumulated other comprehensive loss allocation | $ $ (2,299) (2,276) (66)
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 | $ $ 409,862 387,805  
Distributions | $ (12,652) (14,729)  
Issuance of common units | $ 12,018 19,403  
Acquisition of subsidiary interest from noncontrolling interest | $ (36,085) (27,962)  
Net income | $ 20,016 13,301  
Accumulated other comprehensive loss allocation | $ (2,299) (2,276)  
Fair value adjustment | $ (32,598) 34,320  
Balance at end of period | $ $ 358,262 $ 409,862 387,805
SL Green Operating Partnership      
Organization      
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares) 3,938,823 4,195,875  
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares) 3,938,823    
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Distributions | $ $ (78,855) $ (478) (8,364)
Acquisition of subsidiary interest from noncontrolling interest | $ (1,536) (25,845)  
Accumulated other comprehensive loss allocation | $ $ (2,299) $ (2,276) $ (66)
SL Green Operating Partnership | Operating Partnership      
Organization      
Noncontrolling interest in the operating partnership (as a percent) 5.44% 5.17%  
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) | $ / shares $ 35.0000    
Liquidation preference of preferred units (in dollars per share) | $ / shares 1,000.00    
Conversion Price Per Unit (in dollars per share) | $ / shares $ 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) | $ / shares $ 70.0000    
Liquidation preference of preferred units (in dollars per share) | $ / shares 1,000.00    
Conversion Price Per Unit (in dollars per share) | $ / shares $ 29.12    
SL Green Operating Partnership | Series G Preferred Units      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Stated Distribution Rate 4.50%    
Preferred Units, shares authorized (in shares) 1,902,000    
Number of preferred units issued (in shares) 1,902,000    
Number of Units Outstanding (in shares) 863,972    
Annual dividends on preferred units (in dollars per share) | $ / shares $ 1.1250    
Liquidation preference of preferred units (in dollars per share) | $ / shares 25.00    
Conversion Price Per Unit (in dollars per share) | $ / shares $ 88.50    
Number of company common stock issue on redemption of operation partnership common units 1    
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) | $ / shares $ 0.8750    
Liquidation preference of preferred units (in dollars per share) | $ / shares 25.00    
Conversion Price Per Unit (in dollars per share) | $ / shares $ 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) | $ / shares $ 1.0000    
Liquidation preference of preferred units (in dollars per share) | $ / shares 25.00    
Conversion Price Per Unit (in dollars per share) | $ / shares $ 0    
SL Green Operating Partnership | Series M Preferred Units      
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership      
Stated Distribution Rate 3.75%    
Preferred Units, shares authorized (in shares) 1,600,000    
Number of preferred units issued (in shares) 1,600,000    
Number of Units Outstanding (in shares) 96,357    
Annual dividends on preferred units (in dollars per share) | $ / shares $ 0.9375    
Liquidation preference of preferred units (in dollars per share) | $ / shares 25.00    
Conversion Price Per Unit (in dollars per share) | $ / shares $ 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) | $ / shares $ 1.0000    
Liquidation preference of preferred units (in dollars per share) | $ / shares 25.00    
Conversion Price Per Unit (in dollars per share) | $ / shares $ 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) | $ / shares $ 0.8750    
Liquidation preference of preferred units (in dollars per share) | $ / shares 25.00    
Conversion Price Per Unit (in dollars per share) | $ / shares $ 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) | $ / shares $ 0.8750    
Liquidation preference of preferred units (in dollars per share) | $ / shares 25.00    
Conversion Price Per Unit (in dollars per share) | $ / shares $ 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) | $ / shares $ 1.0000    
Liquidation preference of preferred units (in dollars per share) | $ / shares 25.00    
Conversion Price Per Unit (in dollars per share) | $ / shares $ 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) | $ / shares $ 0.8750    
Liquidation preference of preferred units (in dollars per share) | $ / shares 25.00    
Conversion Price Per Unit (in dollars per share) | $ / shares $ 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    
Annual dividends on preferred units (in dollars per share) | $ / shares $ (6)    
Preferred stock, dividend, multiplier per common unit distribution 1,350