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, 2011
sqft
years
Number of properties owned or investment interests 278
Aggregate square feet of the property owned or investment interest 32,400,000
Number of locations of properties 5
Office And Office/Flex Buildings [Member]
  
Number of properties owned or investment interests 266
Aggregate square feet of the property owned or investment interest 32,000,000
Office Buildings [Member]
  
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]
  
Number of properties owned or investment interests 6
Aggregate square feet of the property owned or investment interest 387,400
Retail [Member]
  
Number of properties owned or investment interests 2
Aggregate square feet of the property owned or investment interest 17,300
Hotels [Member]
  
Number of properties owned or investment interests 1
Land Leased [Member]
  
Number of properties owned or investment interests 3