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INVESTMENTS IN REAL ESTATE - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) property
Business Acquisition [Line Items] |  |
Depreciation expense | $ | $ 16.9 | $ 17.7
Number of property dispositions | property | 0 | 0
Kaiser Foundation Health Plan, Inc. | Revenues | Customer Concentration Risk |  |
Business Acquisition [Line Items] |  |
Concentration risk | 30.90% |
1037 North Sycamore, Los Angeles, CA |  |
Business Acquisition [Line Items] |  |
Percentage of ownership acquired | 100.00% |
1021 East 7th Street, Austin, TX |  |
Business Acquisition [Line Items] |  |
Percentage of ownership acquired |  | 100.00%

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