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CONCENTRATIONS (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 USD ($) item | Jun. 30, 2014 | Jun. 30, 2015 USD ($) item | Jun. 30, 2014 | Dec. 31, 2014 USD ($) item
Concentrations |  |  |  |  |
Concentration risk (as a percent) |  |  | 100.00% | 100.00% |
Number of states in which real estate properties are owned | 4 |  | 4 |  | 4
Office |  |  |  |  |
Concentrations |  |  |  |  |
Number of real estate properties owned | 21 |  | 21 |  | 21
Multi-family |  |  |  |  |
Concentrations |  |  |  |  |
Number of real estate properties owned | 5 |  | 5 |  | 5
Hotel |  |  |  |  |
Concentrations |  |  |  |  |
Number of real estate properties owned | 3 |  | 3 |  | 3
California |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) |  |  | 62.80% | 60.30% |
Washington, D.C. |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) |  |  | 24.20% | 24.30% |
Texas |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) |  |  | 7.60% | 7.70% |
North Carolina |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) |  |  | 4.50% | 5.60% |
New York |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) |  |  | 0.90% | 2.10% |
Revenues | Tenant Revenue Concentrations | Governmental Tenants |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) | 22.90% | 24.50% | 22.80% | 25.10% |
Amount due from Governmental Tenants | $ | $ 6,915,000 |  | $ 6,915,000 |  | $ 7,168,000
Revenues | Geographical concentrations |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) | 100.00% | 100.00% |  |  |
Revenues | Geographical concentrations | California |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) | 63.00% | 60.20% |  |  |
Revenues | Geographical concentrations | Washington, D.C. |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) | 24.50% | 23.90% |  |  |
Revenues | Geographical concentrations | Texas |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) | 7.80% | 7.70% |  |  |
Revenues | Geographical concentrations | North Carolina |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) | 4.50% | 6.10% |  |  |
Revenues | Geographical concentrations | New York |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) | 0.20% | 2.10% |  |  |
Real estate investments | Geographical concentrations |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) |  |  | 100.00% |  | 100.00%
Real estate investments | Geographical concentrations | California |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) |  |  | 52.50% |  | 52.30%
Real estate investments | Geographical concentrations | Washington, D.C. |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) |  |  | 31.10% |  | 31.20%
Real estate investments | Geographical concentrations | Texas |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) |  |  | 7.40% |  | 7.40%
Real estate investments | Geographical concentrations | North Carolina |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) |  |  | 5.40% |  | 5.50%
Real estate investments | Geographical concentrations | New York |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk (as a percent) |  |  | 3.60% |  | 3.60%

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