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CONCENTRATIONS (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 USD ($) property state | Jun. 30, 2018 | Jun. 30, 2019 USD ($) property state | Jun. 30, 2018 | Dec. 31, 2018 USD ($) property state
Concentrations |  |  |  |  |
Number of states in which properties are owned | state | 2 |  | 2 |  | 2
Office properties |  |  |  |  |
Concentrations |  |  |  |  |
Number of real estate properties owned | 10 |  | 10 |  | 16
Hotel properties |  |  |  |  |
Concentrations |  |  |  |  |
Number of real estate properties owned | 1 |  | 1 |  | 1
Parking garages |  |  |  |  |
Concentrations |  |  |  |  |
Number of real estate properties owned | 1 |  | 1 |  | 2
Development site |  |  |  |  |
Concentrations |  |  |  |  |
Number of real estate properties owned | 2 |  | 2 |  | 2
Parking lot |  |  |  |  |
Concentrations |  |  |  |  |
Number of real estate properties owned | 1 |  | 1 |  | 1
Revenues | Tenant Revenue Concentrations | Governmental Tenants |  |  |  |  |
Concentrations |  |  |  |  |
Amounts due from tenant revenue concentrations | $ | $ 1,528 |  | $ 1,528 |  | $ 2,899
Revenues | Tenant Revenue Concentrations | Kaiser Foundation Health Plan, Inc. |  |  |  |  |
Concentrations |  |  |  |  |
Amounts due from tenant revenue concentrations | $ | $ 131 |  | $ 131 |  | $ 331
Revenues | Tenant Revenue Concentrations | Kaiser Foundation Health Plan, Inc. | California |  |  |  |  |
Concentrations |  |  |  |  |
Number of properties occupied by tenant revenue concentrations |  |  | 2 |  |
Revenues | Geographical concentrations |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk, percent | 100.00% | 100.00% | 100.00% | 100.00% |
Revenues | Geographical concentrations | California |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk, percent | 74.40% | 77.70% | 75.60% | 77.30% |
Revenues | Geographical concentrations | Washington, D.C. |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk, percent | 20.40% | 19.10% | 20.10% | 19.50% |
Revenues | Geographical concentrations | Texas |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk, percent | 5.20% | 3.20% | 4.30% | 3.20% |
Real Estate Investments | Geographical concentrations |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk, percent |  |  | 100.00% |  | 100.00%
Real Estate Investments | Geographical concentrations | California |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk, percent |  |  | 72.70% |  | 70.60%
Real Estate Investments | Geographical concentrations | Washington, D.C. |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk, percent |  |  | 23.60% |  | 27.20%
Real Estate Investments | Geographical concentrations | Texas |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk, percent |  |  | 3.70% |  | 2.20%
Office Properties Segment | Revenues | Tenant Revenue Concentrations | Governmental Tenants |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk, percent | 21.90% | 24.70% | 22.70% | 25.40% |
Office Properties Segment | Revenues | Tenant Revenue Concentrations | Kaiser Foundation Health Plan, Inc. |  |  |  |  |
Concentrations |  |  |  |  |
Concentration risk, percent | 16.90% | 12.20% | 13.50% | 12.90% |

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