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)
 3 Months Ended
Mar. 31, 2013
state
sqft
property
Real Estate Properties [Line Items]  
Number of properties owned or investment interests 279
Aggregate square feet of the property owned or investment interest 31,600,000
Number of states where properties are located 7
Office And Office/Flex Buildings [Member]
  
Real Estate Properties [Line Items]  
Number of properties owned or investment interests 257
Aggregate square feet of the property owned or investment interest 31,100,000
Unconsolidated Joint Venture Office Buildings [Member]
  
Real Estate Properties [Line Items]  
Number of properties owned or investment interests 4
Aggregate square feet of the property owned or investment interest 800,000
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
Multi-Family Properties [Member]
  
Real Estate Properties [Line Items]  
Number of properties owned or investment interests 8
Number of units 2,907
Unconsolidated Joint Venture Multi-Family Properties [Member]
  
Real Estate Properties [Line Items]  
Number of properties owned or investment interests 7
Number of units 2,597
Retail [Member]
  
Real Estate Properties [Line Items]  
Number of properties owned or investment interests 4
Aggregate square feet of the property owned or investment interest 98,800
Unconsolidated Joint Venture Retail Buildings [Member]
  
Real Estate Properties [Line Items]  
Number of properties owned or investment interests 2
Aggregate square feet of the property owned or investment interest 81,500
Unconsolidated Joint Venture Hotel [Member]
  
Real Estate Properties [Line Items]  
Number of properties owned or investment interests 1
Number of units 350
Land [Member]
  
Real Estate Properties [Line Items]  
Number of properties owned or investment interests 3