Summary of Significant Accounting Policies - Additional Information (Detail)		1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 28, 2018 USD ($)	Feb. 29, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($) Lease Segment	Dec. 31, 2023 USD ($) Lease	Oct. 01, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Net impact to rental revenues due to the amortization of above market and below market leases				$ 400,000	$ 600,000
Amortization to below market leases				534,000	1,079,000
Income (loss) from investment				221,000	189,000
Assets of investments in unconsolidated affiliates				15,900,000	16,500,000
Liabilities of investments in unconsolidated affiliates				8,600,000	9,000,000
Revenues				78,750,000	75,273,000
Expenses				45,792,000	41,078,000
Impairment related to long-lived assets				$ 0	0
Number of reportable segments | Segment				1
Number of operating segment | Segment				1
Write off of tenant receivable			$ 100,000
Settlement agreement with tenant and received		$ 600,000
Aggregate future lease obligations				$ 2,818,000
Incremental borrowing rate						3.86%
Right-of-use asset - operating lease, net				2,285,000	2,555,000	$ 3,100,000
Right-of-use liability - operating lease				$ 2,486,000	2,739,000	$ 3,100,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]						us-gaap:OtherLiabilitiesMember
Income Tax Holiday, Description				The Company is organized and conducts its operations to qualify as a REIT for Federal income tax purposes. Accordingly, the Company is generally not subject to Federal income taxation on the portion of its distributable income that qualifies as REIT taxable income, to the extent that it distributes at least 90% of its REIT taxable income to its stockholders and complies with certain other requirements as defined in the Code.
Uncertain tax positions				$ 0	0
Standard maximum deposit insurance amount				250,000
Annual rental lease rent				$ 78,750,000	$ 75,273,000
Customer Concentration Risk [Member] | Sales Revenue Net [Member] | Federal Express [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of operating leases | Lease				6	6
Annual rental lease rent				$ 11,600,000	$ 10,900,000
Percentage of rental income				15.00%	15.00%
Customer Concentration Risk [Member] | Sales Revenue Net [Member] | Avis Rent A Car Systems, Inc. [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of operating leases | Lease				1	1
Annual rental lease rent				$ 7,700,000	$ 7,700,000
Percentage of rental income				10.00%	10.00%
Customer Concentration Risk [Member] | Sales Revenue Net [Member] | New York [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of operating leases | Lease				5	5
Annual rental lease rent				$ 9,500,000	$ 9,500,000
Percentage of rental income				12.00%	13.00%
Accounting Standards Update 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Lease term of contract						10 years
Aggregate future lease obligations				$ 2,800,000	$ 3,200,000
Accounting Standards Update 2023-07 [Member]
Summary Of Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]				true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]				true
Two CPS Developers LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of interest purchased	50.00%
Business combination, consideration transferred	$ 5,250,000
Income (loss) from investment				$ 200,000	$ 200,000
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Proportion of taxable income distributed to stockholders				90.00%	90.00%
Minimum [Member] | Properties and Property Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life				5 years
Minimum [Member] | Furniture, Fixtures and Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life				5 years
Maximum [Member] | Properties and Property Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life				40 years
Maximum [Member] | Furniture, Fixtures and Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life				10 years
Above Market Lease [Member]
Summary Of Significant Accounting Policies [Line Items]
Acquired lease intangible assets, net				$ 700,000	$ 800,000
In-place Lease [Member]
Summary Of Significant Accounting Policies [Line Items]
Acquired lease intangible assets, net				5,014,000	5,000,000.0
Buildings and Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Real estate under development				0	0
Other Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Tenant receivables				1,200,000	500,000
Investments in Unconsolidated Affiliates [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenues				1,800,000	1,800,000
Expenses				$ 1,400,000	$ 1,400,000