RELATED-PARTY TRANSACTIONS - Asset Management Fees Calculation (Details) - C I M Urban REIT Management L P $ in Thousands	Dec. 31, 2020 USD ($)
0 - 500,000
Related Party Transaction [Line Items]
Quarterly fee percentage	0.25%
0 - 500,000 | Minimum
Related Party Transaction [Line Items]
Daily average adjusted fair value of investments	$ 0
0 - 500,000 | Maximum
Related Party Transaction [Line Items]
Daily average adjusted fair value of investments	$ 500,000
500,000 - 1,000,000
Related Party Transaction [Line Items]
Quarterly fee percentage	0.2375%
500,000 - 1,000,000 | Minimum
Related Party Transaction [Line Items]
Daily average adjusted fair value of investments	$ 500,000
500,000 - 1,000,000 | Maximum
Related Party Transaction [Line Items]
Daily average adjusted fair value of investments	$ 1,000,000
1,000,000 - 1,500,000
Related Party Transaction [Line Items]
Quarterly fee percentage	0.225%
1,000,000 - 1,500,000 | Minimum
Related Party Transaction [Line Items]
Daily average adjusted fair value of investments	$ 1,000,000
1,000,000 - 1,500,000 | Maximum
Related Party Transaction [Line Items]
Daily average adjusted fair value of investments	$ 1,500,000
1,500,000 - 4,000,000
Related Party Transaction [Line Items]
Quarterly fee percentage	0.2125%
1,500,000 - 4,000,000 | Minimum
Related Party Transaction [Line Items]
Daily average adjusted fair value of investments	$ 1,500,000
1,500,000 - 4,000,000 | Maximum
Related Party Transaction [Line Items]
Daily average adjusted fair value of investments	$ 4,000,000
4,000,000 - 20,000,000
Related Party Transaction [Line Items]
Quarterly fee percentage	0.10%
4,000,000 - 20,000,000 | Minimum
Related Party Transaction [Line Items]
Daily average adjusted fair value of investments	$ 4,000,000
4,000,000 - 20,000,000 | Maximum
Related Party Transaction [Line Items]
Daily average adjusted fair value of investments	$ 20,000,000