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Organization (Details)
9 Months Ended
Sep. 30, 2011
sqfeet
property
Wholly owned operating office properties
 
Investments in real estate 
Number of real estate properties246
Square footage of real estate properties (in square feet)20,200,000
Wholly owned office properties under construction, development or redevelopment
 
Investments in real estate 
Number of real estate properties16
Square footage of real estate properties (in square feet)2,100,000
Wholly owned properties under construction, development or redevelopment which are partially operational.
 
Investments in real estate 
Number of real estate properties3
Wholly owned land parcels
 
Investments in real estate 
Developable square footage of real estate properties (in square feet)13,100,000
Acres of real estate property (in acres)1,520
Wholly owned, partially operational, wholesale data center
 
Investments in real estate 
Expected initial stabilization critical load (in megawatts)18