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CONCENTRATIONS (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 USD ($) property | Sep. 30, 2019 state | Sep. 30, 2020 USD ($) property | Sep. 30, 2019 state | Dec. 31, 2019 USD ($) property
Concentration Risk [Line Items] |  |  |  |  |
Number of states in which properties are owned | state |  | 2 |  | 2 |
Office properties |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of real estate properties owned | 8 |  | 8 |  | 8
Hotel properties |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of real estate properties owned | 1 |  | 1 |  | 1
Parking garages |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of real estate properties owned | 1 |  | 1 |  | 1
Development site |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of real estate properties owned | 1 |  | 1 |  | 1
Revenues | Customer Concentration Risk | Kaiser Foundation Health Plan, Inc. |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Amounts due from tenant revenue concentrations | $ | $ 51 |  | $ 51 |  | $ 23
Revenues | Customer Concentration Risk | Kaiser Foundation Health Plan, Inc. | California |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of properties occupied by tenant revenue concentrations |  |  | 2 |  |
Revenues | Customer Concentration Risk | Governmental Tenants |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Amounts due from tenant revenue concentrations | $ | $ 3 |  | $ 3 |  | $ 282
Revenues | Geographical concentrations |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percent | 100.00% | 100.00% | 100.00% | 100.00% |
Revenues | Geographical concentrations | California |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percent | 88.60% | 84.10% | 90.00% | 77.70% |
Revenues | Geographical concentrations | Texas |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percent | 11.40% | 7.40% | 9.80% | 5.10% |
Revenues | Geographical concentrations | Washington, D.C. |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percent | 0.00% | 8.50% | 0.20% | 17.20% |
Real Estate Investments | Geographical concentrations |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percent |  |  | 100.00% |  | 100.00%
Real Estate Investments | Geographical concentrations | California |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percent |  |  | 93.90% |  | 94.40%
Real Estate Investments | Geographical concentrations | Texas |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percent |  |  | 6.10% |  | 5.60%
Office | Revenues | Customer Concentration Risk | Kaiser Foundation Health Plan, Inc. |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percent | 27.90% | 22.20% | 26.10% | 15.60% |
Office | Revenues | Customer Concentration Risk | Governmental Tenants |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percent | 2.50% | 11.20% | 2.30% | 20.00% |

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