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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Depreciation and Amortization, Construction-in-Progress, and Ground Leases (Details)
 12 Months Ended
Dec. 31, 2019
Minimum  
Construction in Progress [Line Items]  
Buildings and improvements useful life 5 years
Tenant improvements useful lives 1 year
Maximum  
Construction in Progress [Line Items]  
Buildings and improvements useful life 55 years
Tenant improvements useful lives 16 years