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Organization and Basis of Presentation (Tables)
 12 Months Ended
Dec. 31, 2012
Organization and Basis of Presentation  
Schedule of Investment in real estate properties
Location
  Ownership   Number of
Properties		   Square Feet   Weighted
Average
Occupancy(1)		  

Manhattan

   Consolidated properties     27     18,347,945     93.8 %

   Unconsolidated properties     9     5,934,434     95.0 %

Suburban

  

Consolidated properties

    
25		    
3,863,000		    
79.9
%

 

   Unconsolidated properties     5     1,539,700     84.7 %
                   

         66     29,685,079     91.7 %
                   
(1)
The weighted average occupancy represents the total leased square feet divided by total available rentable square feet.