Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Stamford SM LLC) (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (Stamford SM LLC) (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 3 Months Ended
Feb. 17, 2012
Class A Portfolio In Stamford, Connecticut [Member]
sqft
Feb. 17, 2012
Class A Office Space [Member]
property
sqft
Feb. 17, 2012
Residential Space [Member]
item
sqft
Mar. 31, 2013
Stamford SM LLC [Member]
Mar. 31, 2013
Mezz Loan [Member]
Feb. 17, 2012
Mezz Loan [Member]
Schedule of Equity Method Investments [Line Items]            
Area of property (in square feet) 1,700,000 1,670,000 70,500      
Venture property acquisition cost $ 40.0          
Mortgage loan face amount           50
Number of properties   7        
Number of rental units     106      
Mortgage loan carrying amount         43.0  
Threshold of which excess proceeds are paid to another party         $ 47  
Spread over LIBOR         3.25%  
Mortgage loan scheduled to mature         Aug. 01, 2013  
Loan extension period         1 year  
Percentage of interest in venture       80.00%    
Third party ownership percentage       20.00%    
Holding and distribution pattern under operating agreement       The operating agreement of Stamford SM provides, among other things, for distributions of net available cash in accordance with its members' respective ownership percentages. The Company holds an 80 percent interest in the venture. The Company and the 20 percent member share equally in decision-making on all major decisions involving the operations of the venture.