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Partners' Capital of the Operating Partnership - Additional Information (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Stockholders' Equity          
Common stock shares excluded from the diluted shares outstanding (shares) 352,917 1,574,571 352,917 135,000  
SL Green Operating Partnership          
Stockholders' Equity          
Shares, issued (in shares) 71,024,627   71,024,627    
Units outstanding (units) 71,024,627   71,024,627    
Number of units of operating partnership owned by the noncontrolling interest unit holders (units) 4,852,552   4,852,552   4,509,953
Common stock shares excluded from the diluted shares outstanding (shares) 352,917 1,574,571 352,917 135,000  
SL Green Operating Partnership | Operating Partnership          
Stockholders' Equity          
Noncontrolling interest in the operating partnership (as a percent) 6.40%   6.40%   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