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Investment in Real Estate - Schedule of Discontinued Operations (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
May 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations          
Impairment loss from discontinued operations $ 0 $ 5,435,000 $ 0 $ 5,435,000  
Loss from discontinued operations (60,000) 883,000 (126,000) 1,618,000  
City Plaza
         
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations          
Sale price         56,000,000
Impairment loss from discontinued operations   5,600,000      
Total office revenues 0 1,965,000 0 3,962,000  
Office operating expenses (60,000) (766,000) (126,000) (1,555,000)  
Depreciation and amortization 0 (316,000) 0 (789,000)  
Loss from discontinued operations $ (60,000) $ 883,000 $ (126,000) $ 1,618,000