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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Non-controlling Interest in Consolidated Joint Venture (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net book value	$ 3,194,079		$ 3,370,877
Investments in real estate-related securities	246,059		345,828
Debt outstanding	2,970,116		3,170,289
Net proceeds from sale of liquid corporate senior loans	4,788	$ 446,974
CMBS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investments in real estate-related securities	188,511
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	21,730
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	142,700
VIE, Primary Beneficiary \| N P J V Holdings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Equity securities	152,700
VIE, Not Primary Beneficiary \| CIM Commercial Lending REIT (CLR)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt outstanding	870,800
VIE, Not Primary Beneficiary \| OFSI BSL XIV CLO, Ltd
Accounts, Notes, Loans and Financing Receivable [Line Items]
Equity securities	$ 21,700