NOTES PAYABLE - Mortgage Loans Payable (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Long-term Debt, Gross	$ 275,955
Mortgage loans payable, net	190,433	$ 191,001
Mortgage Loans Payable
Line of Credit Facility [Line Items]
Long-term Debt, Gross	191,155	191,872
Deduct: Deferred financing costs, less accumulated amortization	(722)	(871)
Mortgage loans payable, net	$ 190,433	191,001
Talcott Resolution Life Insurance Company | Mortgage Loans Payable | Commerce Corner
Line of Credit Facility [Line Items]
Interest rate	3.41%
Long-term Debt, Gross	$ 11,933	12,213
Nationwide Life Insurance Company | Mortgage Loans Payable | Flats at Carrs Hill
Line of Credit Facility [Line Items]
Interest rate	3.63%
Long-term Debt, Gross	$ 14,500	14,500
Nationwide Life Insurance Company | Mortgage Loans Payable | Providence Square, Marietta, GA, Retail
Line of Credit Facility [Line Items]
Interest rate	3.67%
Long-term Debt, Gross	$ 29,700	29,700
State Farm Life Insurance Company | Mortgage Loans Payable | Elston Plaza
Line of Credit Facility [Line Items]
Interest rate	3.89%
Long-term Debt, Gross	$ 17,149	17,470
Massachusetts Mutual Life Insurance Company | Mortgage Loans Payable | The Glenn
Line of Credit Facility [Line Items]
Interest rate	3.02%
Long-term Debt, Gross	$ 66,000	66,000
Transamerica Life Insurance Company | Mortgage Loans Payable | Wallingford Plaza
Line of Credit Facility [Line Items]
Interest rate	4.56%
Long-term Debt, Gross	$ 6,733	6,849
JPMorgan Chase Bank | Mortgage Loans Payable | Seattle East Industrial, Redmond, WA
Line of Credit Facility [Line Items]
Interest rate	3.87%
Long-term Debt, Gross	$ 45,140	$ 45,140