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Subsequent Events (Details) (USD $)
 6 Months Ended 12 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Redeemable Convertible Series 6.3% Preferred Stock [Member]
Dec. 31, 2013
Redeemable Convertible Series 6.3% Preferred Stock [Member]
Jun. 30, 2014
Port of San Diego Complex [Member]
Dec. 31, 2013
Port of San Diego Complex [Member]
Aug. 13, 2014
Subsequent Event [Member]
Redeemable Convertible Series 6.3% Preferred Stock [Member]
Aug. 13, 2014
Subsequent Event [Member]
Private Placement [Member]
Aug. 13, 2014
Subsequent Event [Member]
Private Placement [Member]
Series B Preferred Stock [Member]
Aug. 13, 2014
Subsequent Event [Member]
Union Terrace Office Building [Member]
Story
sqft
Aug. 13, 2014
Subsequent Event [Member]
Port of San Diego Complex [Member]
Acquisition of Real Estate [Abstract]                      
Purchase price of property acquired                   $ 9,400,000  
Number of stories in building                   4  
Rentable square feet                   84,000  
Down payment for the property acquired                   2,800,000  
Mortgage notes payable 95,421,185 89,551,724     10,489,729 10,608,385       6,600,000  
Interest rate (in hundredths)         4.75%         4.50%  
Maturity date         Mar. 05, 2020         Aug. 01, 2024  
Private Placement Transaction [Abstract]                      
Maximum amount of private placement transaction               40,000,000      
Initial investment               15,000,000      
Additional investment after initial investment               25,000,000      
Term to make additional investment after initial investment               1 year      
Number of shares issued at close of transaction (in shares)     1,649 1,649         15,000    
Preferred stock total return on funds invested (in hundredths)                 14.00%    
Preferred stock dividend rate percentage (in hundredths)     6.30% 6.30%     6.30%   10.00%    
Preferred stock dividend rate percentage accrued and compounded monthly (in hundredths)                 4.00%    
Term to redeem preferred stock after closing date                 3 years    
Term to extend redemption of preferred stock                 2 years    
Payment to redeem preferred stock             $ 1,649,000        
Ownership interest (in hundredths)                     100.00%