Segment Reporting - Summary of Financial Results by Segment (Details) - USD ($) $ in Thousands	3 Months Ended								9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	[1]	Mar. 31, 2022	[1]	Sep. 30, 2023	Sep. 30, 2022
Revenues
Rental revenue	$ 4,774								$ 12,634
Total revenues	4,774								12,634
Expenses
Rental property operating	1,468								3,826
Income from investment in real estate debt	447			$ 105					1,287	$ 105
Loss from investments in real estate-related and other securities	(318)								(366)
Segment net operating income (loss)	3,435								9,729
Depreciation and amortization	(1,674)			(4)					(6,044)	(4)
General and administrative	(989)			(1,527)					(3,274)	(1,528)
Mandatorily redeemable instruments interest costs	(1,376)			(27)					(6,045)	(27)
Interest expense	(1,708)			(55)					(5,632)	(55)
Other income (expenses), net	114			(152)					(11)	(153)
Net loss	(2,198)	$ (2,608)	$ (6,471)	(1,660)	$ (2)		$ 0		(11,277)	(1,662)
Net loss attributable to non-controlling interests in consolidated joint ventures	(10)								(89)
Net loss attributable to JPMREIT stockholders, basic	(2,188)			$ (1,660)					(11,188)	$ (1,662)
Multifamily
Revenues
Rental revenue	3,613								10,926
Total revenues	3,613								10,926
Expenses
Rental property operating	1,334								3,690
Segment net operating income (loss)	2,279								7,236
Depreciation and amortization	(1,081)								(5,281)
Industrial
Revenues
Rental revenue	1,161								1,708
Total revenues	1,161								1,708
Expenses
Rental property operating	134								136
Segment net operating income (loss)	1,027								1,572
Depreciation and amortization	(589)								(750)
Investment in real estate debt, real estate-related and other securities
Expenses
Income from investment in real estate debt	447								1,287
Loss from investments in real estate-related and other securities	(318)								(366)
Segment net operating income (loss)	$ 129								$ 921

[1] J.P. Morgan Real Estate Income Trust, Inc. was formed on November 5, 2021 and commenced operations on September 2, 2022, accordingly, there were minimal operations during the three months ended March 31, 2022 and June 30, 2022.