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Partners' Capital of the Operating Partnership - Additional Information (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Stockholders' Equity          
Common stock shares excluded from the diluted shares outstanding (in shares) 5,633,308 5,345,430 6,358,175 5,155,662  
SL Green Operating Partnership          
Stockholders' Equity          
Shares, issued (in shares) 71,028,166   71,028,166    
Units outstanding (units) 71,028,166   71,028,166    
Number of units of operating partnership owned by the noncontrolling interest unit holders (units) 4,849,771   4,849,771   4,509,953
Common stock shares excluded from the diluted shares outstanding (in shares) 1,145,802 1,734,283 2,360,021 1,418,306  
SL Green Operating Partnership | Operating Partnership          
Stockholders' Equity          
Noncontrolling interest in the operating partnership (as a percent) 6.39%   6.39%   5.97%
SL Green Operating Partnership | Series I Preferred Units          
Stockholders' Equity          
Units outstanding (units) 9,200,000   9,200,000    
Period of restriction to redeem OP Units     1 year    
Conversion of stock, shares issued     1