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REVENUES - Contract Assets and Liabilities Activity (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
Contract Assets Activity [Roll Forward]  
Balance at beginning of period $ 289,000
Tenant openings (436,000)
Executed leases 431,000
Balance at end of period 284,000
Contract Liabilities Activity [Roll Forward]  
Balance at beginning of period 265,000
Completed performance obligation (107,000)
Balance at end of period $ 158,000