BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Lease incentives	$ 4,000,000	$ 4,000,000
Lease incentives, accumulated amortization	2,700,000	2,400,000
Allowance for uncollectible accounts receivable	579,000	1,900,000
Tenant recoveries outside of lease agreements	0	$ 0
Performance obligations	$ 0