Segment Reporting - Summary of Financial Results by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenues
Rental revenue	$ 29,672	$ 8,270
Total revenues	29,672	8,270
Expenses
Rental property operating	11,292	3,033
Income from investments in real estate debt	5,182	1,478
Income from investments in real estate-related and other securities	23	1,081
Segment net operating income (loss)	23,585	7,796
Depreciation and amortization	(14,948)	(3,558)
General and administrative	(1,845)	(1,647)
Mandatorily redeemable instruments interest costs	(573)	(1,186)
Interest expense	(9,310)	(2,488)
Other income, net	114	2,743
Net (loss) income	(2,977)	1,660
Net loss attributable to non-controlling interests in consolidated joint ventures	(199)	(21)
Net (loss) income attributable to JPMREIT stockholders	(2,778)	1,681
Multifamily
Revenues
Rental revenue	15,808	4,195
Total revenues	15,808	4,195
Expenses
Rental property operating	7,463	1,579
Income from investments in real estate debt	(0)
Segment net operating income (loss)	8,345	2,616
Depreciation and amortization	(7,166)	(1,635)
Industrial
Revenues
Rental revenue	9,607	1,963
Total revenues	9,607	1,963
Expenses
Rental property operating	2,052	300
Segment net operating income (loss)	7,555	1,663
Depreciation and amortization	(5,854)	(949)
Single-family rental
Revenues
Rental revenue	1,019	603
Total revenues	1,019	603
Expenses
Rental property operating	489	484
Segment net operating income (loss)	530	119
Depreciation and amortization	(384)	(385)
Retail
Revenues
Rental revenue	3,238	1,509
Total revenues	3,238	1,509
Expenses
Rental property operating	1,288	664
Segment net operating income (loss)	1,950	845
Depreciation and amortization	(1,544)	(589)
Investments in real estate debt, real estate-related and other securities
Expenses
Rental property operating	0	6
Income from investments in real estate debt	5,182	1,478
Income from investments in real estate-related and other securities	23	1,081
Segment net operating income (loss)	5,205	2,553
Depreciation and amortization	$ 0	$ 0