Investments in Unconsolidated Entities - Schedule of Activity Related to Investment in Unconsolidated Entities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Investments in Unconsolidated Entities [Roll Forward]
Equity method investments, beginning balance	$ 4,452,000	$ 0
Contributions	207,119,000	7,200,000
Distributions	(1,509,000)	0	$ 0
(Loss) Income From Unconsolidated Entities	8,307,000	(2,748,000)	0
Accumulated Other Comprehensive Loss	(881,000)	0	0
Equity method investments, ending balance	217,488,000	4,452,000	0
Net Lease Joint Venture
Investments in Unconsolidated Entities [Roll Forward]
Equity method investments, beginning balance	4,452,000	0
Contributions	104,274,000	7,200,000
Distributions	0	0
(Loss) Income From Unconsolidated Entities	(1,367,000)	(2,748,000)
Accumulated Other Comprehensive Loss	(881,000)	0
Equity method investments, ending balance	106,478,000	4,452,000	$ 0
Bank Loan Portfolio Joint Venture
Investments in Unconsolidated Entities [Roll Forward]
Equity method investments, beginning balance	0
Contributions	102,845,000
Distributions	(1,509,000)
(Loss) Income From Unconsolidated Entities	9,674,000
Accumulated Other Comprehensive Loss	0
Equity method investments, ending balance	$ 111,010,000	$ 0

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

- Definition

Amount of income (loss) for proportionate share of equity method investee's income (loss).

+ References + Details

BLACKSTONE MORTGAGE TRUST, INC. 10-K