KBRA Confirms Preliminary Ratings for BOS 2026-LYRK Transaction
KBRA has announced the assignment of preliminary credit ratings to one class of BOS 2026-LYRK, a commercial mortgage-backed securities (CMBS) single-borrower securitization backed by a newly originated office asset loan.
The transaction is supported by a $360.0 million non-recourse, first-lien mortgage loan. Structured with a five-year term, the loan requires interest-only payments throughout its duration, with no scheduled principal amortization. These payments are calculated based on an assumed fixed interest rate of 5.95%. As a non-recourse loan, repayment is secured solely by the underlying property, limiting the lender’s claim to the collateral in the event of default.
The collateral for this financing is the borrower’s leasehold interest in Lyrik, a recently completed, institutional-quality office property located in Boston’s highly desirable Back Bay neighborhood. Positioned prominently at the intersection of Boylston Street and Massachusetts Avenue, the building benefits from strong visibility, accessibility, and proximity to a wide range of amenities, transportation options, and a highly educated workforce.
Completed in 2024, Lyrik is a 20-story, Class A office tower encompassing approximately 495,275 square feet. The property has been developed to modern sustainability standards and has achieved LEED Gold certification, reflecting its energy efficiency, environmental performance, and appeal to tenants with ESG-focused priorities. The building’s design, construction quality, and location position it competitively within the Boston office market, particularly among newly delivered assets.
The majority of the building’s space—approximately 457,263 square feet, or 92.3% of the total—is dedicated to office use. The remaining 38,012 square feet, accounting for 7.7% of the property, is allocated to retail space, which is expected to enhance the overall tenant and visitor experience by providing on-site amenities and services.
As of April 2026, the property was 93.4% leased to a total of 11 tenants, indicating a strong level of occupancy for a recently delivered office building. The tenant roster is anchored by several well-known and creditworthy companies, contributing to the asset’s income stability. The five largest tenants collectively account for a substantial portion of the property’s leased area and rental income.
CarGurus is the largest tenant, contributing 46.3% of the total base rent, followed by Lego at 32.8%. Additional major tenants include Weil, Gotshal & Manges LLP, which accounts for 10.6% of base rent, Rivian at 3.4%, and Avra at 2.5%. Together, these top five tenants represent 95.7% of the total base rent and occupy approximately 90.2% of the building’s total square footage. While this concentration underscores the strength and quality of the tenant base, it also introduces a degree of tenant concentration risk that is typical in single-asset, single-borrower transactions.
In its evaluation of the transaction, KBRA conducted a comprehensive analysis of the property’s financial performance and structural characteristics. This included a detailed review of the asset’s cash flow generation using its North American CMBS Property Evaluation Methodology, as well as the application of its North American CMBS Single Borrower and Large Loan Rating Methodology. These frameworks are designed to assess the credit quality of large, single-asset transactions by examining factors such as income stability, tenant quality, lease terms, market conditions, and structural features of the loan.
Additionally, KBRA incorporated its Global Structured Finance Counterparty Methodology to evaluate the creditworthiness and risk exposure associated with transaction counterparties. The agency also considered its ESG Global Rating Methodology where relevant, reflecting the growing importance of environmental, social, and governance factors in credit analysis, particularly for newly constructed and sustainably certified properties like Lyrik.
As a result of its analysis, KBRA derived a net cash flow (KNCF) for the property of approximately $29.7 million. This figure is 10.3% lower than the net cash flow projected by the issuer, reflecting KBRA’s more conservative assumptions regarding income and expenses. Such adjustments are typical in rating agency analyses, as they aim to account for potential variability in operating performance over time.
KBRA also assigned a value to the property of approximately $359.7 million. This valuation is notably 33.8% lower than the appraised value provided in third-party reports, highlighting a more cautious approach to asset valuation amid evolving market conditions, particularly in the office sector. Factors such as changing workplace trends, hybrid work adoption, and broader economic uncertainty may contribute to more conservative valuation assumptions.
Based on KBRA’s valuation, the resulting in-trust loan-to-value (KLTV) ratio is 100.1%, indicating that the loan amount slightly exceeds the agency’s assessed value of the property. This level of leverage suggests a relatively higher risk profile compared to transactions with lower LTV ratios, as it provides less cushion against potential declines in property value or income.
In forming its credit opinion, KBRA also reviewed a range of third-party due diligence materials, including engineering, environmental, and appraisal reports. The agency conducted a site inspection of the property to assess its physical condition, quality, and market positioning firsthand. In addition, legal documentation related to the transaction was analyzed to ensure structural integrity and compliance with applicable standards.
Overall, the preliminary ratings reflect KBRA’s assessment of the transaction’s credit characteristics, taking into account the strength of the underlying asset, the quality of its tenant base, and the structural features of the loan, balanced against considerations such as tenant concentration and conservative valuation assumptions.
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