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Organization and Ownership (Details)
Dec. 31, 2012
sqft
Summary of stabilized portfolio of operating properties  
Rentable square feet 13,249,780 [1]
Office Properties [Member]
 
Summary of stabilized portfolio of operating properties  
Rentable square feet 13,249,780 [1]
Development Properties [Member]
 
Summary of stabilized portfolio of operating properties  
Number of buildings 0
Rentable square feet 1,416,000 [2]
Redevelopment Properties [Member]
 
Summary of stabilized portfolio of operating properties  
Number of buildings 0
Rentable square feet 410,000 [2]
Lease Up Properties [Member]
 
Summary of stabilized portfolio of operating properties  
Number of buildings 1
Rentable square feet 98,000 [2]
Stabilized Portfolio [Member] | Office Properties [Member]
 
Summary of stabilized portfolio of operating properties  
Number of buildings 114
Rentable square feet 13,249,780
Number of Tenants 530
Percentage Occupied 92.80%
[1] Includes square footage from our stabilized portfolio.
[2] Estimated rentable square feet upon completion.