Quarterly report pursuant to Section 13 or 15(d)

Properties, net (Details 5)

 v2.3.0.11
Properties, net (Details 5)
6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Fully operational office properties
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 2  
Square footage of real estate properties (in square feet) 228,000  
Square feet placed in service on properties as of prior year end (in square feet)   79,000
Fully operational office properties | Baltimore/Washington Corridor
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 1  
Fully operational office properties | Greater Baltimore
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 1  
Properties under construction
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 10  
Square footage of real estate properties (in square feet) 1,200,000  
Properties under construction | Baltimore/Washington Corridor
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 4  
Properties under construction | Greater Baltimore
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 2  
Properties under construction | San Antonio
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 1  
Properties under construction | Northern Virginia
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 1  
Properties under construction | Huntsville
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 1  
Properties under construction | St. Mary's County
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 1  
Properties under development
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 8  
Square footage of real estate properties (in square feet) 1,000,000  
Properties under development | Baltimore/Washington Corridor
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 3  
Properties under development | San Antonio
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 2  
Properties under development | Northern Virginia
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 1  
Properties under development | Huntsville
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 2  
Properties under redevelopment
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 2  
Square footage of real estate properties (in square feet) 297,000  
Properties under redevelopment | Northern Virginia
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 1  
Properties under redevelopment | Greater Philadelphia
   
2011 Construction, Development and Redevelopment Activities    
Number of real estate properties 1