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Subsequent Events (Details) (USD $) |  |  | 1 Months Ended
--- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Apr. 30, 2014 Subsequent Event [Member] Bismarck Office Building [Member] sqft
Subsequent Event [Line Items] |  |  |
Purchase price |  |  | $ 5,400,000
Rentable square feet |  |  | 99,200
Down payment for the property acquired |  |  | 3,900,000
Promissory note issued for property acquired | $ 88,911,866 | $ 89,551,724 | $ 2,500,000
Fixed interest rate on mortgage (in hundredths) |  |  | 6.12%
Maturity date |  |  | Oct. 01, 2016

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