NOTES PAYABLE Mortgage Loans Payable, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt	$ 204,041
Mortgage loans payable, net	125,595	$ 125,698
Mortgages
Debt Instrument [Line Items]
Long-term debt	126,441	126,637
Deduct: Deferred financing costs, less accumulated amortization	(846)	(939)
Mortgage loans payable, net	125,595	125,698
Mortgages \| Hartford Life Insurance Company \| Commerce Corner
Debt Instrument [Line Items]
Long-term debt	$ 12,551	12,747
Interest rate	3.41%
Mortgages \| Nationwide Life Insurance Company \| Flats at Carrs Hill
Debt Instrument [Line Items]
Long-term debt	$ 14,500	14,500
Interest rate	3.63%
Mortgages \| Nationwide Life Insurance Company \| Providence Square
Debt Instrument [Line Items]
Long-term debt	$ 29,700	29,700
Interest rate	3.67%
Mortgages \| State Farm Life Insurance Company \| Elston Plaza
Debt Instrument [Line Items]
Long-term debt	$ 17,600	17,600
Interest rate	3.89%
Mortgages \| Transamerica Life Insurance Company \| Wallingford Plaza
Debt Instrument [Line Items]
Long-term debt	$ 6,950	6,950
Interest rate	4.56%
Mortgages \| JPMorgan Chase Bank \| Seattle East Industrial
Debt Instrument [Line Items]
Long-term debt	$ 45,140	$ 45,140
Interest rate	3.87%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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