Quarterly report pursuant to Section 13 or 15(d)

Properties, Net (Details 4)

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Properties, Net (Details 4)
ft² in Thousands, $ in Millions
3 Months Ended
Feb. 15, 2017
USD ($)
ft²
Mar. 31, 2017
USD ($)
ft²
Property
Construction and Redevelopment Activities    
Sale price of land | $   $ 14.3
Gain on sale of land | $   $ 4.2
Office properties under, or contractually committed for, construction or approved for redevelopment    
Construction and Redevelopment Activities    
Square footage of real estate properties (in square feet) | ft²   1,300
Number of real estate properties | Property   9
Newly redeveloped properties placed in service    
Construction and Redevelopment Activities    
Square feet of properties placed in service | ft²   86
Number of real estate properties | Property   3
Properties under construction or contractually committed for construction    
Construction and Redevelopment Activities    
Square footage of real estate properties (in square feet) | ft²   1,300
Number of real estate properties | Property   8
Properties completed Held-for-future lease | Office properties under, or contractually committed for, construction or approved for redevelopment    
Construction and Redevelopment Activities    
Number of real estate properties | Property   2
Properties under or approved for redevelopment    
Construction and Redevelopment Activities    
Square footage of real estate properties (in square feet) | ft²   14
Number of real estate properties | Property   1
Operating Properties | Northern Virginia Defense/IT | Defense/Information Technology Locations | 3120 Fairview Park Drive    
Construction and Redevelopment Activities    
Square footage of real estate properties (in square feet) | ft² 190  
Transaction value | $ $ 39.0