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Organization and Basis of Presentation (Details) (SL Green Operating Partnership)
1 Months Ended
Jun. 30, 1997
Dec. 31, 2013
Dec. 31, 2012
Organization      
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent) 100.00%    
Noncontrolling interest in the operating partnership (as a percent)   2.96% 2.94%
Service Corporation
     
Organization      
Economic interest in variable interest entity (as a percent) 95.00%