Quarterly report pursuant to Section 13 or 15(d)

Properties, net (Details 3)

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Properties, net (Details 3)
 3 Months Ended
Mar. 31, 2013
Property
sqft
Newly constructed properties placed in service
  
Construction and Redevelopment Activities  
Square Feet of Properties Placed in Service 236,000
Number of Real Estate Properties Placed In Service 3
Properties under construction or contractually committed for construction
  
Construction and Redevelopment Activities  
Number of real estate properties 9
Square footage of real estate properties (in square feet) 1,100,000
Properties under construction or contractually committed for construction | Baltimore and Washington Corridor
  
Construction and Redevelopment Activities  
Number of real estate properties 3
Properties under construction or contractually committed for construction | Northern Virginia
  
Construction and Redevelopment Activities  
Number of real estate properties 3
Properties under construction or contractually committed for construction | Huntsville
  
Construction and Redevelopment Activities  
Number of real estate properties 3
Properties under redevelopment | Greater Philadelphia
  
Construction and Redevelopment Activities  
Number of real estate properties 1
Square footage of real estate properties (in square feet) 183,000