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KBRA Downgrades Four Ratings and Affirms All Other Ratings for BANK 2018-BNK15

10 Oct 2025   |   New York

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KBRA downgrades the ratings of four classes of certificates and affirms all other outstanding ratings for BANK 2018-BNK15, a $972.1 million CMBS conduit transaction. The rating actions follow a surveillance review of the transaction, which has exhibited a worsening in pool performance since securitization. The rating actions also reflect KBRA’s estimated losses for ten K-LOCs (21.6% of the pool balance) and the resulting loss-adjusted C/E levels.

As of the September 2025 remittance period, there are two (3.6%) specially serviced loans, of which one (0.1%) is 90+ days delinquent and one (3.5%) is 60 days delinquent. KBRA identified ten K-LOCs (21.6%), three (16.1%) of which have estimated losses. The K-LOCs are depicted in the table below.

Loss Given Default (000s) Loss Severity 2 Starwood Hotel Portfolio LO $100,000 10.3% N C N DSCR 01/29/2025 $44,471 44.5% 7 Harvard Park OF $34,000 3.5% Y 60+ N DSCR 01/05/2023 $21,806 64.1% 15 Embassy Suites St Louis LO $22,323 2.3% N C N DSCR 08/13/2020 $2,223 10.0% 21 The Center at Coldwater RT $16,900 1.7% N C N DSCR 12/12/2023 - - 24 Desert Sky Esplanade RT $11,817 1.2% N C N Occupancy 10/15/2024 - - 27 Algonquin Galleria RT $10,671 1.1% N C N DSCR 02/13/2023 - - 36 Fairway Executive Building OF $6,300 0.6% N C N Recent Delinquency 03/11/2025 - - 43 Omega Self Storage SS $4,452 0.5% N C N DSCR 01/11/2021 - - 60 CVS Spotsylvania RT $2,300 0.2% N C N Occupancy 08/11/2025 - - 67 The Birch Street Corporation CH $1,143 0.1% Y 90+ N Specially Serviced 02/07/2024 - - Total K-LOCs $209,905 21.6% $68,501 1. K-LOC Date is the date when the most recent K-LOC was initially determined. 2. Loss Given Default assumes a 100% probability of default (PD). KBRA may determine a lower PD when estimating losses to a transaction. KBRA Estimated 2 K-LOCs Prosp. ID Loan Name Prop Type Current In- Trust Balance (000s) % of Deal Balance SS Loan Status Mod (Y/N) Primary K-LOC Reason K-LOC Date 1
Source: KBRA

Excluding the K-LOCs with estimated losses, the transaction's WA KLTV is 78.1%, compared to 90.2% at last review and 86.1% at securitization. The KDSC is 2.19x, compared to 2.19x at last review and 2.18x at issuance.

Details concerning the ratings adjustments are as follows:

  • Class F to B- (sf) from BB (sf)
  • Class G to CCC (sf) from B- (sf)
  • Class X-F to B- (sf) from BB (sf)
  • Class X-G to CCC (sf) from B- (sf)

To access ratings and relevant documents, click here.

Click here to view the report.

Related Publication

Methodologies

Disclosures

Further information on key credit considerations, sensitivity analyses that consider what factors can affect these credit ratings and how they could lead to an upgrade or a downgrade, and ESG factors (where they are a key driver behind the change to the credit rating or rating outlook) can be found in the full rating report referenced above.

A description of all substantially material sources that were used to prepare the credit rating and information on the methodology(ies) (inclusive of any material models and sensitivity analyses of the relevant key rating assumptions, as applicable) used in determining the credit rating is available in the Information Disclosure Form(s) located here.

Information on the meaning of each rating category can be located here.

Further disclosures relating to this rating action are available in the Information Disclosure Form(s) referenced above. Additional information regarding KBRA policies, methodologies, rating scales and disclosures are available at www.kbra.com.

About KBRA

Kroll Bond Rating Agency, LLC (KBRA), one of the major credit rating agencies (CRA), is a full-service CRA registered with the U.S. Securities and Exchange Commission as an NRSRO. Kroll Bond Rating Agency Europe Limited is registered as a CRA with the European Securities and Markets Authority. Kroll Bond Rating Agency UK Limited is registered as a CRA with the UK Financial Conduct Authority. In addition, KBRA is designated as a Designated Rating Organization (DRO) by the Ontario Securities Commission for issuers of asset-backed securities to file a short form prospectus or shelf prospectus. KBRA is also recognized as a Qualified Rating Agency by Taiwan’s Financial Supervisory Commission and is recognized by the National Association of Insurance Commissioners as a Credit Rating Provider (CRP) in the U.S.

Doc ID: 1011688