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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Non-controlling Interest in Consolidated Joint Venture (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net book value	$ 3,220,476		$ 3,370,877
Investments in real estate-related securities	295,155		345,828
Debt outstanding	3,026,195		3,170,289
Net proceeds from sale of liquid corporate senior loans	4,788	$ 120,015
CMBS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investments in real estate-related securities	238,705
Liquid corporate senior loans \| Due to affiliates
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan sales, traded			265,400
Net proceeds from sale of liquid corporate senior loans			259,700
Loss on sale of loans receivable			(2,900)
CLO subordinated note
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investments in real estate-related securities	23,089
Investment in equity securities			$ 27,600
VIE, Primary Beneficiary \| CIM Commercial Lending REIT (CLR) \| Senior Secured Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net book value	1,100,000
VIE, Primary Beneficiary \| CIM Commercial Lending REIT (CLR) \| CMBS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investments in real estate-related securities	195,300
VIE, Primary Beneficiary \| N P J V Holdings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Equity securities	155,400
VIE, Not Primary Beneficiary \| CIM Commercial Lending REIT (CLR)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt outstanding	934,300
VIE, Not Primary Beneficiary \| OFSI BSL XIV CLO, Ltd
Accounts, Notes, Loans and Financing Receivable [Line Items]
Equity securities	$ 23,100