RELATED PARTY ARRANGEMENTS - Expense Reimbursements, O&O Costs and Expense Support Agreement (Details)			3 Months Ended			9 Months Ended	12 Months Ended
	Mar. 24, 2020 USD ($)	Apr. 25, 2016 USD ($)	Dec. 31, 2022 USD ($)	Mar. 23, 2020 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 01, 2016 USD ($)	Dec. 31, 2015 USD ($)
Related Party Transaction [Line Items]
Due to affiliates			$ 18,894,000				$ 18,894,000	$ 22,921,000
Minimum offering proceeds needed before expense repayment		$ 500,000,000
Due to affiliates			18,894,000				18,894,000	22,921,000
Amortization of discount on note to affiliate							181,000	174,000	$ 164,000
RREEF America
Related Party Transaction [Line Items]
Related party note payable discount										$ 1,862,000
Related party debt extinguishment	$ 1,182,000
RREEF America | Note to Affiliate
Related Party Transaction [Line Items]
Related party note payable discount	$ 946,000
Amortization of discount on note to affiliate				$ 34,000		$ 130,000
RREEF America | Note to Affiliate | Measurement Input, Discount Rate
Related Party Transaction [Line Items]
Fair value input, discount rate	0.0375			0.0193
RREEF America
Related Party Transaction [Line Items]
Reimbursable operating expenses							298,000	242,000
Expense payments											$ 9,200,000
Minimum offering proceeds needed before expense repayment										$ 250,000
Note to Affiliate			5,383,000				5,383,000	5,383,000
RREEF America | Organization and Offering Costs
Related Party Transaction [Line Items]
Expense payments											3,775,000
RREEF America | Reimbursable under the Advisory Agreement
Related Party Transaction [Line Items]
Due to affiliates			70,000				70,000	71,000
RREEF America | Operating Expense
Related Party Transaction [Line Items]
Expense payments											5,229,000
RREEF America | Waived Reimbursement of Organization and Offering Expenses
Related Party Transaction [Line Items]
Amounts of transaction	$ 3,567,000
RREEF America | Expense Support Agreement
Related Party Transaction [Line Items]
Due to affiliates			5,383,000				5,383,000
RREEF America | The Letter Agreement
Related Party Transaction [Line Items]
First period reimbursement payments			$ 250,000				250,000
First period reimbursement payments			12 months
Reimbursement payments period two			$ 198,000				198,000
Second period reimbursement payments			12 months
RREEF America | Private Offering
Related Party Transaction [Line Items]
Expense payments											$ 196,000
Affiliated Entity | RREEF America
Related Party Transaction [Line Items]
Repayments of debt					$ 250,000
Note to Affiliate					8,950,000
Affiliated Entity | RREEF America | Note to Affiliate
Related Party Transaction [Line Items]
Amortization of discount on note to affiliate							$ 181,000	$ 174,000	$ 164,000
Affiliated Entity | Organization and Offering Costs | RREEF America
Related Party Transaction [Line Items]
Note to Affiliate					3,567,000
Affiliated Entity | Private Offering Offering Costs | RREEF America
Related Party Transaction [Line Items]
Note to Affiliate					196,000
Affiliated Entity | Operating Expense | RREEF America
Related Party Transaction [Line Items]
Note to Affiliate					$ 5,187,000
Affiliated Entity | The Letter Agreement | RREEF America
Related Party Transaction [Line Items]
Amount of obligations waived	$ 3,567,000