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Organization and Basis of Presentation (Tables)
 6 Months Ended
Jun. 30, 2011
Organization and Basis of Presentation [Abstract]  
Summary of stabilized portfolio of operating properties
 
                                 
    Number of
 		    Rentable
 		    Number of
 		       
    Buildings     Square Feet     Tenants     Percentage Occupied  
 
Office Properties(1)
    107       11,465,821       416       87.9 %
Industrial Properties
    40       3,605,407       62       97.6 %
                                 
Total Stabilized Portfolio
    147       15,071,228       478       90.2 %
                                 
 
 
(1) Includes eight office properties acquired during the six months ended June 30, 2011 for a total amount of $413.0 million (see Note 2 for additional information).