Under the terms of the facility, we are subject to various restrictive financial and nonfinancial covenants which, among other things, require us to maintain certain leverage ratios, cash flow and debt service coverage ratios and secured borrowing ratios. Certain of these ratios are based on our pool of unencumbered assets, which aggregated approximately $10.8 billion at June 30, 2025. The facility is recourse to us, and, as of June 30, 2025, we were in compliance with the financial and nonfinancial covenants under the facility.
Senior Unsecured Term Debt
In March 2025, we completed an issuance of five-year senior unsecured notes, with an aggregate principal amount of $350.0 million and a coupon rate of 5.40%. As of June 30, 2025, we had an aggregate principal amount of $1.8 billion of senior unsecured notes outstanding; $1.4 billion of public senior unsecured notes and $350.0 million of private senior unsecured notes, subject to a registration rights agreement. These senior unsecured notes bear a weighted average coupon rate of 3.98% and interest on these notes is paid semi-annually. The supplemental indentures governing our senior unsecured notes contain various restrictive covenants, including limitations on our ability to incur additional secured and unsecured indebtedness. As of June 30, 2025, we were in compliance with these covenants.
Prior to the inaugural issuance of public debt in March 2018, unsecured long-term debt had been issued through the private placement of notes to institutional investors. As of June 30, 2025, we had an aggregate principal amount of $82.0 million of privately placed notes outstanding. The financial covenants of the privately placed notes are similar to our current unsecured revolving credit facility. As of June 30, 2025, we were in compliance with these covenants.
We have a credit agreement with a group of lenders which provides for two unsecured, variable-rate term loans. The loans consist of an unsecured, variable-rate term loan issued in February 2023 (“February 2023 Unsecured Term Loan”) and an unsecured, variable-rate term loan issued in December 2023 (“December 2023 Unsecured Term Loan”).
As of June 30, 2025, total borrowings on the February 2023 Unsecured Term Loan were $921.1 million. The February 2023 Unsecured Term Loan matures in April 2027 and the interest rate resets daily at Daily Simple SOFR plus an adjustment of 0.10%, plus a spread ranging from 1.10% to 1.70% based on our consolidated total leverage ratio as defined in the credit agreement. As of June 30, 2025, our spread was 1.25%. Our credit agreement allows for a further reduction in the pricing of one basis point if certain environmental sustainability metrics are met. As of June 30, 2025, we had 11 interest rate swap agreements with an aggregate notional value of $921.1 million that effectively convert the term loan borrowings to an all-in fixed interest rate of 4.3469% for the remaining term of the loan.
As of June 30, 2025, total borrowings on the December 2023 Unsecured Term Loan were $727.5 million. The December 2023 Unsecured Term Loan matures in July 2026 and includes two 12-month extensions. The interest rate resets daily at Daily Simple SOFR plus an adjustment of 0.10%, plus a spread ranging from 1.20% to 1.80% based on our consolidated total leverage ratio as defined in the credit agreement. As of June 30, 2025, our spread was 1.35%. Our credit agreement allows for a further reduction in the pricing of one basis point if certain environmental sustainability metrics are met. As of June 30, 2025, we had seven interest rate swap agreements, with an aggregate notional value of $727.5 million, which effectively convert the term loan borrowings to an all-in fixed rate of 5.3699% for the remaining term of the loan.
The aggregate outstanding principal amount of our unsecured senior notes and term loans payable was $3.5 billion as of June 30, 2025.
Non-recourse Secured Debt
As of June 30, 2025, approximately 31% of our real estate investment portfolio served as collateral for outstanding borrowings under our STORE Master Funding debt program. We believe our STORE Master Funding program allows for flexibility not commonly found in non-recourse debt, often making it preferable to traditional debt issued in the commercial mortgage-backed securities market. Under the program, STORE Capital serves as both master and special servicer for the collateral pool, allowing for active portfolio monitoring and prompt issue resolution. In addition, features of the program allowing for the sale or substitution of collateral, provided certain criteria are met, facilitate active portfolio management. Through this debt program, we arrange for bankruptcy remote, special purpose entity subsidiaries to issue multiple series of investment-grade asset backed net lease mortgage notes, or ABS notes, from time to time as additional collateral is added to the collateral pool and leverage can be added in incremental note issuances based on the value of the collateral pool.
The ABS notes are generally issued by our wholly owned special purpose entity subsidiaries to institutional investors through the asset backed securities market. These ABS notes are typically issued in two classes, Class A and Class B. At the time of issuance,