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Discontinued Operations and Properties Held for Sale (Details) (USD $)
 3 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
property
Jun. 30, 2011
property
Dec. 31, 2011
Jul. 31, 2012
Property in New York City
Jul. 12, 2012
Property in New York City
Discontinued Operations and Properties Held for Sale              
Total sales price, net of closing costs     $ 7,048,000 $ 11,544,000      
Discontinued operations and properties held for sale              
Agreed sale price of property held for sale             18,250,000
Estimated gain on sale of property held for sale           15,000,000  
Net book value of properties held for sale 2,732,000   2,732,000   7,718,000    
Related assets of properties held for sale 88,000   88,000   378,000    
Number of properties sold whose net gain is included in discontinued operations     2        
Number of properties sold whose operations are included in discontinued operations     3        
Number of properties sold whose net gain and operations are included in discontinued operations       1      
Discontinued Operations and Properties Held for Sale              
Rental income 270,000 396,000 546,000 895,000      
Depreciation and amortization 68,000 90,000 137,000 201,000      
Real estate expenses 41,000 63,000 100,000 131,000      
Interest expense 108,000 117,000 224,000 235,000      
Total expenses 217,000 270,000 461,000 567,000      
Income from operations 53,000 126,000 85,000 328,000      
Net gain on sale 2,205,000 932,000 2,205,000 932,000      
Income from discontinued operations $ 2,258,000 $ 1,058,000 $ 2,290,000 $ 1,260,000