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CONCENTRATIONS (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) property | Mar. 31, 2019 | Dec. 31, 2019 USD ($) property state
Concentration Risk [Line Items] |  |  |
Number of states in which properties are owned | state |  |  | 2
Office properties |  |  |
Concentration Risk [Line Items] |  |  |
Number of real estate properties owned | 8 |  | 8
Hotel properties |  |  |
Concentration Risk [Line Items] |  |  |
Number of real estate properties owned | 1 |  | 1
Parking garages |  |  |
Concentration Risk [Line Items] |  |  |
Number of real estate properties owned | 1 |  | 1
Development site |  |  |
Concentration Risk [Line Items] |  |  |
Number of real estate properties owned | 1 |  | 1
Revenues | Tenant Revenue Concentrations | Kaiser Foundation Health Plan, Inc. |  |  |
Concentration Risk [Line Items] |  |  |
Amounts due from tenant revenue concentrations | $ | $ 11 |  | $ 23
Revenues | Tenant Revenue Concentrations | Kaiser Foundation Health Plan, Inc. | California |  |  |
Concentration Risk [Line Items] |  |  |
Number of properties occupied by tenant revenue concentrations | 2 |  |
Revenues | Tenant Revenue Concentrations | Governmental Tenants |  |  |
Concentration Risk [Line Items] |  |  |
Amounts due from tenant revenue concentrations | $ | $ 101 |  | $ 282
Revenues | Geographical concentrations |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percent | 100.00% | 100.00% |
Revenues | Geographical concentrations | California |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percent | 91.90% | 76.50% |
Revenues | Geographical concentrations | Texas |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percent | 7.70% | 3.60% |
Revenues | Geographical concentrations | Washington, D.C. |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percent | 0.40% | 19.90% |
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 Properties Segment | Revenues | Tenant Revenue Concentrations | Kaiser Foundation Health Plan, Inc. |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percent | 25.30% | 11.30% |
Office Properties Segment | Revenues | Tenant Revenue Concentrations | Governmental Tenants |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percent | 2.20% | 23.30% |

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