Segment Reporting - Schedule of Financial Results by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenues
Rental revenue	$ 46,827	$ 44,216	$ 137,516	$ 133,080
Income from commercial mortgage loans	6,658	7,871	20,824	23,252
Total revenues	53,485	52,087	158,340	156,332
Expenses:
Total segment expenses	16,770	16,075	48,252	47,573
Realized gain on sale of real estate investments	0	0	0	15
Realized and unrealized gain from real estate-related securities	3,353	14,910	3,654	12,080
Realized and unrealized gain from real estate debt	181	508	382	2,528
Gain (loss) from equity investments in unconsolidated international affiliated funds	3,380	(1,718)	1,683	(4,347)
Unrealized gain (loss) from interest rate derivatives	1	(394)	52	(339)
Segment net operating income	44,774	50,558	116,529	119,822
Depreciation and amortization	(20,315)	(20,061)	(60,628)	(59,818)
General and administrative expenses	(2,335)	(1,970)	(6,741)	(6,375)
Advisory fee due to affiliates	(7,815)	(7,434)	(22,893)	(22,298)
Interest income	2,444	1,980	7,171	5,651
Interest expense	(11,134)	(11,610)	(33,133)	(33,756)
Net income	5,510	10,999	467	2,992
Net income (loss) attributable to non-controlling interests	11	(6)	25	(20)
Net income attributable to preferred stock	4	4	11	11
Net income attributable to common stockholders	5,495	11,001	431	3,001
Mortgages
Expenses:
Unrealized (loss) gain on commercial mortgage loans and note payable	1,145	846	722	787
Loans Payable
Expenses:
Unrealized (loss) gain on commercial mortgage loans and note payable	(110)	(70)	110	105
Industrial
Revenues
Rental revenue	13,990	12,592	39,843	38,206
Income from commercial mortgage loans	0	0	0	0
Total revenues	13,990	12,592	39,843	38,206
Expenses:
Total segment expenses	3,835	3,845	11,021	11,707
Segment net operating income	10,155	8,747	28,822	26,499
Depreciation and amortization	(5,967)	(5,738)	(17,601)	(17,434)
Healthcare
Revenues
Rental revenue	11,128	11,257	33,545	33,572
Income from commercial mortgage loans	0	0	0	0
Total revenues	11,128	11,257	33,545	33,572
Expenses:
Total segment expenses	4,019	3,939	12,269	11,593
Segment net operating income	7,109	7,318	21,276	21,979
Depreciation and amortization	(5,909)	(6,337)	(17,746)	(18,284)
Multifamily
Revenues
Rental revenue	8,312	7,996	24,389	24,050
Income from commercial mortgage loans	0	0	0	0
Total revenues	8,312	7,996	24,389	24,050
Expenses:
Total segment expenses	3,738	3,525	10,246	10,090
Segment net operating income	4,574	4,471	14,143	13,960
Depreciation and amortization	(2,562)	(2,534)	(7,843)	(7,440)
Retail
Revenues
Rental revenue	6,234	4,690	18,041	14,277
Income from commercial mortgage loans	0	0	0	0
Total revenues	6,234	4,690	18,041	14,277
Expenses:
Total segment expenses	1,783	1,424	5,133	4,312
Segment net operating income	4,451	3,266	12,908	9,965
Depreciation and amortization	(2,734)	(2,134)	(7,908)	(6,412)
Single-Family Housing
Revenues
Rental revenue	2,853	2,802	8,506	8,487
Income from commercial mortgage loans	0	0	0	0
Total revenues	2,853	2,802	8,506	8,487
Expenses:
Total segment expenses	1,536	1,496	4,118	4,419
Realized gain on sale of real estate investments				15
Segment net operating income	1,317	1,306	4,388	4,083
Depreciation and amortization	(1,264)	(1,065)	(3,626)	(3,301)
Office
Revenues
Rental revenue	3,225	3,757	9,986	11,418
Income from commercial mortgage loans	0	0	0	0
Total revenues	3,225	3,757	9,986	11,418
Expenses:
Total segment expenses	1,115	1,054	3,383	3,169
Segment net operating income	2,110	2,703	6,603	8,249
Depreciation and amortization	(1,455)	(1,835)	(4,632)	(5,507)
Self-Storage
Revenues
Rental revenue	1,085	1,122	3,206	3,070
Income from commercial mortgage loans	0	0	0	0
Total revenues	1,085	1,122	3,206	3,070
Expenses:
Total segment expenses	744	792	2,082	2,283
Segment net operating income	341	330	1,124	787
Depreciation and amortization	(424)	(418)	(1,272)	(1,440)
Commercial Mortgage Loans
Revenues
Rental revenue	0	0	0	0
Income from commercial mortgage loans	6,658	7,871	20,824	23,252
Total revenues	6,658	7,871	20,824	23,252
Expenses:
Total segment expenses	0	0	0	0
Unrealized (loss) gain on commercial mortgage loans and note payable	1,145	846
Segment net operating income	7,803	8,717	21,546	24,039
Depreciation and amortization	0	0	0	0
Commercial Mortgage Loans \| Mortgages
Expenses:
Unrealized (loss) gain on commercial mortgage loans and note payable			722	787
Real Estate-Related Securities
Revenues
Rental revenue	0	0	0	0
Income from commercial mortgage loans	0	0	0	0
Total revenues	0	0	0	0
Expenses:
Total segment expenses	0	0	0	0
Realized and unrealized gain from real estate-related securities	3,353	14,910	3,654	12,080
Realized and unrealized gain from real estate debt	181	508	382	2,528
Segment net operating income	3,534	15,418	4,036	14,608
Depreciation and amortization	0	0	0	0
International Affiliated Funds
Revenues
Rental revenue	0	0	0	0
Income from commercial mortgage loans	0	0	0	0
Total revenues	0	0	0	0
Expenses:
Total segment expenses	0	0	0	0
Gain (loss) from equity investments in unconsolidated international affiliated funds	3,380	(1,718)	1,683	(4,347)
Segment net operating income	3,380	(1,718)	1,683	(4,347)
Depreciation and amortization	0	0	0	0
Other
Revenues
Rental revenue	0	0	0	0
Income from commercial mortgage loans	0	0	0	0
Total revenues	0	0	0	0
Expenses:
Total segment expenses	0	0	0	0
Unrealized gain (loss) from interest rate derivatives	1	(394)	52	(339)
Segment net operating income	0	0	0	0
Depreciation and amortization	0	0	0	0
General and administrative expenses	(2,335)	(1,970)	(6,741)	(6,375)
Advisory fee due to affiliates	(7,815)	(7,434)	(22,893)	(22,298)
Interest income	2,444	1,980	7,171	5,651
Interest expense	(11,134)	(11,610)	(33,133)	(33,756)
Other \| Loans Payable
Expenses:
Unrealized (loss) gain on commercial mortgage loans and note payable	$ (110)	$ (70)	$ 110	$ 105

Nuveen Global Cities REIT, Inc. 10-Q