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RELATED PARTY TRANSACTIONS - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Nov. 01, 2019
Related Party Transaction [Line Items]        
Payment for administrative fees $ 54 $ 49    
Limit of total operating expenses as a percent of net income for the four most recently completed fiscal quarters 2.00%      
Limit of total operating expenses as a percent of average invested assets 25.00%      
Due to affiliates $ 5,993   $ 5,552  
Private Placement        
Related Party Transaction [Line Items]        
Other organization and offering costs 1,500      
KBS Capital Advisors LLC        
Related Party Transaction [Line Items]        
Due to affiliates 1,300      
KBS Capital Advisors LLC | Public Offering        
Related Party Transaction [Line Items]        
Offering costs, other than selling commissions and dealer manager fees 4,400      
Organization and offering costs $ 39      
KBS Capital Advisors LLC | Public Offering | Minimum        
Related Party Transaction [Line Items]        
Reimbursable offering costs determination, gross offering costs, percentage 1.00%      
KBS Capital Advisors LLC | Public Offering | Maximum        
Related Party Transaction [Line Items]        
Reimbursable offering costs determination, gross offering costs, percentage 1.00%      
KBS Capital Advisors LLC | Second Private Placement        
Related Party Transaction [Line Items]        
Amounts of transaction $ 5,500      
KBS Capital Advisors LLC | GKP Holding LLC        
Related Party Transaction [Line Items]        
Ownership percentage       33.33%