Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Boston-Downtown Crossing) (Details)

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Investments In Unconsolidated Joint Ventures (Boston-Downtown Crossing) (Details) (Boston-Downtown Crossing [Member], USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Jan. 29, 2007
Oct. 31, 2006
sqft
Dec. 31, 2008
Boston-Downtown Crossing [Member]
     
Percentage of interest in venture   15.00%  
Area of office property   1,200,000  
Venture property acquisition cost $ 100    
Impairment of real estate     $ 69.5
Holding and distribution pattern under operating agreement  

 

Distributions will generally be in proportion to its members' respective ownership interests and, depending upon the development unit, promotes will be available to specified partners after the achievement of certain internal rates of return ranging from 10 to 15 percent.