Quarterly report pursuant to Section 13 or 15(d)

Organization And Basis Of Presentation (Details)

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Organization And Basis Of Presentation (Details)
 9 Months Ended
Sep. 30, 2012
state
sqft
property
Real Estate Properties [Line Items]  
Number of properties owned or investment interests 276
Aggregate square feet of the property owned or investment interest 32,200,000
Number of states where properties are located 5
Office And Office/Flex Buildings [Member]
  
Real Estate Properties [Line Items]  
Number of properties owned or investment interests 264
Aggregate square feet of the property owned or investment interest 31,800,000
Unconsolidated Joint Ventures [Member]
  
Real Estate Properties [Line Items]  
Number of properties owned or investment interests 8
Aggregate square feet of the property owned or investment interest 1,200,000
Industrial/Warehouse Facilities [Member]
  
Real Estate Properties [Line Items]  
Number of properties owned or investment interests 6
Aggregate square feet of the property owned or investment interest 387,400
Retail [Member]
  
Real Estate Properties [Line Items]  
Number of properties owned or investment interests 2
Aggregate square feet of the property owned or investment interest 17,300
Hotel [Member]
  
Real Estate Properties [Line Items]  
Number of properties owned or investment interests 1
Land [Member]
  
Real Estate Properties [Line Items]  
Number of properties owned or investment interests 3