Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (BNES Associates III) (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (BNES Associates III) (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
The Offices At Crystal Lake, L.L.C. [Member]
Oct. 23, 2012
BNES Associates III's Interest In The Offices At Crystal Lake [Member]
Oct. 23, 2012
BNES Associates III [Member]
sqft
Schedule of Equity Method Investments [Line Items]      
Indirect residual ownership percentage     31.25%
Area of property (in square feet)     106,345
Percentage of interest in venture     50.00%
Investment ownership percentage   62.50%  
Mortgage loans, carrying amount $ 7.8    
Interest rate 4.76%    
Mortgage loan, maturity date November 2023