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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%

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