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Summary of Significant Accounting Policies (Policies) | 9 Months Ended
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Sep. 30, 2025
Accounting Policies [Abstract] |
Basis of Presentation | Basis of Presentation—The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with the instructions to Form 10-Q and Article 10-01 of Regulation S-X for interim financial statements. Accordingly, they do not include all the information and footnotes required by generally accepted accounting principles in the United States of America (“GAAP”) for complete financial statements. These unaudited consolidated financial statements and related notes should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 (the “2024 Annual Report”). The preparation of these consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the dates of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. Certain prior year amounts have been reclassified in the Company's consolidated financial statements and the related notes to conform to the current period presentation. In the opinion of management, the accompanying consolidated financial statements contain all adjustments consisting of normal recurring adjustments necessary for a fair statement of the results for the interim periods presented. Such operating results may not be indicative of the expected results for any other interim periods or the entire year.
Principles of Consolidation | Principles of Consolidation—The consolidated financial statements include the accounts and operations of the Company, its wholly-owned subsidiaries and VIEs for which the Company is the primary beneficiary. All intercompany balances and transactions have been eliminated in consolidation. Consolidated VIEs—The Company consolidates VIEs for which it is considered the primary beneficiary. As of September 30, 2025, the total assets of these consolidated VIEs were $78.4 million and total liabilities were $30.1 million. The classifications of these assets are primarily within “Net investment in sales-type leases,” “Real estate, net,” “Real estate-related intangible assets, net” and “Deferred operating lease income receivable” on the Company’s consolidated balance sheets. The classifications of liabilities are primarily within “Debt obligations, net” and “Accounts payable, accrued expenses and other liabilities” on the Company’s consolidated balance sheets. The liabilities of these VIEs are non-recourse to the Company and can only be satisfied from each VIE’s respective assets. The Company has provided no financial support to VIEs that it was not previously contractually required to provide and did not have any unfunded commitments related to consolidated VIEs as of September 30, 2025.
Loans receivable, net | Loans receivable, net—Loans receivable, net includes senior mortgages that the Company originated to certain of its Ground Lease tenants in connection with Ground Leases (refer to Note 6). The Company’s loans receivable are classified as held-for-investment and are reported at their outstanding unpaid principal balance net of any unamortized acquisition premiums or discounts, unamortized deferred loan costs or fees and credit loss allowances. ​ The Company performs a quarterly analysis of its loans receivable that incorporates management’s current judgments about credit quality based on all known and relevant internal and external factors that may affect collectability. The Company considers, among other things, payment status, lien position, borrower financial resources and investment collateral, collateral type, project economics and other economic factors. The Company estimates its expected loss on its loans receivable (including unfunded commitments) based on relevant information including current market conditions and reasonable and supportable forecasts that affect the collectability of its investments. The estimate of the Company’s expected loss requires significant judgment. The Company calculates its expected loss through the use of third-party historical market data for loans with similar characteristics to the Company’s loan portfolio. The Company also utilizes a third-party to provide forecasts to incorporate current and future economic conditions that may impact the performance of the commercial real estate assets securing its investments. ​ The Company will consider a loan to be non-performing and place it on non-accrual status at such time as: (1) interest payments become 90 days delinquent; (2) it has a maturity default; or (3) management determines it is probable that it will be unable to collect all amounts due according to the contractual terms of the loan. Non-accrual loans will be returned to accrual status when they have become contractually current and management believes all amounts contractually owed will be received. ​ The Company made the accounting policy election to record accrued interest on its loans receivable separate from its loans receivable and to exclude accrued interest from its amortized cost basis disclosures. Any accrued interest receivable is recorded in “Deferred expenses and other assets, net” on the Company’s consolidated balance sheets. As of September 30, 2025, the Company had $0.2 million of accrued interest on its consolidated balance sheet. The Company will place its loans on non-accrual status once interest on the loan becomes 90 days delinquent and will reverse any accrued interest as a reduction to interest income or recognize a credit loss expense at such time. As such, the Company elected the practical expedient to not record an allowance against accrued interest receivable. During the three and nine months ended September 30, 2025, the Company did not reverse any accrued interest on its loans receivable.
Interest Income | Interest Income—Interest income on the Company’s loans receivable (refer to Note 6) is recognized on an accrual basis using the effective interest method and is recorded in “Interest income” in the Company’s consolidated statements of operations.
Fair values | Fair Values—The Company is required to disclose fair value information with regard to its financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practical to estimate fair value. The Financial Accounting Standards Board (“FASB”) guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. The following fair value hierarchy prioritizes the inputs to be used in valuation techniques to measure fair value: Level 1: unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2: quoted prices in markets that are not active, or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liability; and Level 3: prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity). The Company determines the estimated fair values of financial assets and liabilities based on a hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the Company and the Company’s own assumptions about market participant assumptions. The following table presents the carrying value and fair value for the Company’s financial instruments ($ in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of September 30, 2025 | ​ | As of December 31, 2024
​ | ​ | Carrying | ​ | Fair | ​ | Carrying | ​ | Fair
​ |  | Value |  | Value |  | Value |  | Value
Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net investment in sales-type leases(1) | ​ | $ | 3,527 | ​ | $ | 3,548 | ​ | $ | 3,455 | ​ | $ | 3,680
Ground Lease receivables(1) | ​ |  | 1,961 | ​ |  | 2,091 | ​ |  | 1,833 | ​ |  | 2,043
Loans receivable, net(1) | ​ | ​ | 45 | ​ | ​ | 45 | ​ | ​ | — | ​ | ​ | —
Loans receivable, net - related party(1) | ​ | ​ | 113 | ​ | ​ | 116 | ​ | ​ | 112 | ​ | ​ | 115
Cash and cash equivalents(2) | ​ |  | 12 | ​ |  | 12 | ​ |  | 8 | ​ |  | 8
Restricted cash(2) | ​ |  | 9 | ​ |  | 9 | ​ |  | 9 | ​ |  | 9
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Debt obligations, net(1) | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Level 1 | ​ | ​ | 1,428 | ​ | ​ | 1,403 | ​ | ​ | 1,426 | ​ | ​ | 1,335
Level 3 | ​ | ​ | 3,086 | ​ | ​ | 2,577 | ​ | ​ | 2,891 | ​ | ​ | 2,351
Total debt obligations, net | ​ | ​ | 4,514 | ​ |  | 3,980 | ​ |  | 4,317 | ​ |  | 3,686
(1) | The fair value of the Company’s net investment in sales-type leases, Ground Lease receivables, loans receivable, net and loans receivable, net – related party are classified as Level 3 within the fair value hierarchy. The fair value of the Company’s debt obligations traded in secondary markets are classified as Level 1 within the fair value hierarchy and the fair value of the Company’s debt obligations not traded in secondary markets are classified as Level 3 within the fair value hierarchy.
(2) | The Company determined the carrying values of its cash and cash equivalents and restricted cash approximated their fair values and are classified as Level 1 within the fair value hierarchy.
​
Redeemable Noncontrolling Interests | Redeemable Noncontrolling Interests—In February 2022, the Company sold 108,571 Caret units of Portfolio Holdings (refer to Note 13) for $19.0 million to third-party investors and received a commitment from an existing shareholder (which was affiliated with one of the Company’s independent directors) for the purchase of 28,571 Caret units for $5.0 million (which did not close). As part of the sale, the Company agreed to use commercially reasonable efforts to provide public market liquidity for such Caret units by seeking to provide a listing of the Caret units, or securities into which they may be exchanged, within two years of the sale. Because public market liquidity was not achieved by February 2024, the investors in the February 2022 transaction had the right to cause their Caret units purchased in February 2022 to be redeemed by Portfolio Holdings at their original purchase price less the amount of distributions previously made on such units. During the three months ended March 31, 2024, the redemption option was extended to April 2024. In April 2024, all of the investors in the February 2022 transaction exercised this right and elected to have their Caret units redeemed at the original purchase price less the amount of distributions previously made on such units. The Company classified these redeemable Caret units in accordance with Accounting Standards Codification (“ASC”) 480: Distinguishing Liabilities from Equity. ASC 480-10-S99-3A requires that equity securities redeemable at the option of the holder be classified outside of permanent stockholders’ equity. The Company classified redeemable Caret units as “Redeemable noncontrolling interests” in its consolidated balance sheets and consolidated statements of changes in equity. The redeemable noncontrolling interest’s carrying amount was equal to the higher of (i) the initial carrying amount, increased or decreased for the redeemable noncontrolling interest’s share of net income or loss and dividends; or (ii) the redemption value.

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