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Real Estate Assets and Lease Intangibles, Acquisitions of Properties (Details) (USD $) |  |  | 1 Months Ended | 9 Months Ended |  | 1 Months Ended | 9 Months Ended |  | 1 Months Ended | 9 Months Ended |
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Sep. 30, 2014 | Dec. 31, 2013 | Aug. 31, 2014 Union Terrace Office Building [Member] sqft | Sep. 30, 2014 Union Terrace Office Building [Member] | Dec. 31, 2013 Union Terrace Office Building [Member] | Aug. 31, 2014 3 Model Homes In Arizona [Member] Unit | Apr. 30, 2014 Bismarck Office Building [Member] sqft | Sep. 30, 2014 Bismarck Office Building [Member] | Dec. 31, 2013 Bismarck Office Building [Member] | Feb. 28, 2014 6 Model Home properties in Pennsylvania [Member] Unit | Sep. 30, 2014 Model Home Properties [Member] | Dec. 31, 2013 Model Home Properties [Member]
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired (in units) |  |  |  |  |  | 3 |  |  |  | 6 |  |
Purchase price of property acquired |  |  | $ 9,400,000 |  |  | $ 1,000,000 | $ 5,400,000 |  |  | $ 1,800,000 |  |
Cash payment for the properties acquired |  |  | 2,800,000 |  |  | 400,000 | 2,200,000 |  |  | 700,000 |  |
Mortgage notes payable | 99,402,457 | 89,551,724 | 6,600,000 | 6,600,000 | 0 | 600,000 | 3,200,000 | 3,337,405 | 0 | 1,100,000 | 8,014,803 | 12,438,797
Interest rate (in hundredths) |  |  | 4.50% | 4.50% |  |  | 6.12% | 6.12% |  |  |  |
Maturity date |  |  |  | Aug. 31, 2024 |  |  |  | Oct. 01, 2016 |  |  |  |
Rentable square feet |  |  | 84,000 |  |  |  | 93,000 |  |  |  |  |
Allocated Purchase Price of Properties Acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Land |  |  |  | 1,717,000 |  |  |  | 413,000 |  |  | 371,300 |
Buildings and other |  |  |  | 5,267,900 |  |  |  | 4,233,700 |  |  | 1,410,000 |
Tenant improvements |  |  |  | 1,643,300 |  |  |  | 474,400 |  |  | 0 |
In-place leases |  |  |  | 370,100 |  |  |  | 164,300 |  |  | 0 |
Leasing costs |  |  |  | 426,700 |  |  |  | 64,600 |  |  | 0 |
Total purchase price |  |  |  | $ 9,425,000 |  |  |  | $ 5,350,000 |  |  | $ 1,781,300 |

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