Quarterly report pursuant to Section 13 or 15(d)

Organization (Details)

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Organization (Details)
 9 Months Ended
Sep. 30, 2013
sqft
acre
Operating office properties
  
Investments in real estate  
Number of real estate properties 210
Square footage of real estate properties (in square feet) 19,200,000
Office propertiesunder, or contractually committed for, construction or approved for redevelopment
  
Investments in real estate  
Number of real estate properties 11
Square footage of real estate properties (in square feet) 1,500,000
Office properties under construction or redevelopment which are partially operational
  
Investments in real estate  
Number of real estate properties 1
Land held or under pre-construction
  
Investments in real estate  
Area of land held or under pre-construction (in acres) 1,721
Area of land parcels controlled but not owned (in acres) 56
Developable square footage of real estate properties (in square feet) 20,400,000
Partially operational, wholesale data center
  
Investments in real estate  
The expected stabilization critical load after completion of development (in megawatts) 18