BANK 2021-BNK31 $documentTitle

Understanding an SEC filing can be complex, especially for specialized investments. This summary cuts through the jargon of BANK 2021-BNK31's annual report, providing a clear, concise overview of its operations, financial standing, and potential risks. Our goal is to help you grasp the essentials of this investment vehicle and its performance for the fiscal year ending December 31, 2021.

Business Overview: What is BANK 2021-BNK31?

BANK 2021-BNK31 is not a traditional operating company. Instead, it functions as a Commercial Mortgage-Backed Securities (CMBS) trust, specifically an "issuing entity." This means it's a specialized investment vehicle created to hold a collection, or "pool," of commercial mortgage loans. These loans are then bundled and transformed into tradable securities, similar to bonds, which are sold to investors.

When you invest in BANK 2021-BNK31, you are essentially investing in the cash flow generated by these specific commercial properties. You receive payments as the underlying borrowers repay their loans. The trust itself operates passively; its primary function is to hold these loans and distribute payments according to its established governing documents.

This annual report, filed as a Form 10-K, details the trust's activities for the fiscal year that concluded on December 31, 2021. Wells Fargo Commercial Mortgage Securities, Inc. prepared the report. Major financial institutions, including Wells Fargo Bank, Morgan Stanley, Bank of America, and National Cooperative Bank, acted as original sponsors, playing a key role in the trust's creation and launch.

The Loan Portfolio: What assets does the trust hold?

The trust's core assets consist of a collection of commercial mortgage loans, which originally totaled approximately $1.2 billion. These loans finance various commercial properties for businesses, such as office buildings, retail centers, industrial facilities, multifamily apartments, and hotels. By December 31, 2021, the outstanding balance of these loans was approximately $1.1 billion. While the portfolio diversifies across property types and geographic regions, it does show notable concentrations in specific markets.

The report highlights the largest loans in the portfolio at the trust's formation, or "cut-off date," in July 2021:

• McClellan Park Mortgage Loan: Represented about 9.9% of the total original loan pool.
• 605 Third Avenue Mortgage Loan: Represented about 8.8% of the pool.
• Miami Design District Mortgage Loan: Also represented about 8.8% of the pool.
• 250 West 57th Street Mortgage Loan: Represented about 4.2% of the pool.
• McDonald’s Global HQ Mortgage Loan: Represented about 3.8% of the pool.
• ExchangeRight Net Leased Portfolio #41 Mortgage Loan: Represented about 2.9% of the pool.
• Coleman Highline Mortgage Loan: Represented about 2.4% of the pool.
• Fresh Pond Cambridge Mortgage Loan: Represented about 2.2% of the pool.

It's important to understand that some of these loans are part of larger "loan combinations." This means BANK 2021-BNK31 holds only a portion of the loan, while other parts of the same loan may be held by different trusts (such as BANK 2020-BNK29, BANK 2020-BNK30, or BANK 2021-BNK33). This structure creates an interconnected risk, as the performance of these specific properties can affect multiple investment vehicles.

Financial Performance

Unlike a traditional company's financial statements, this 10-K does not present typical revenue and profit figures. Instead, the trust's financial performance directly reflects the health of its underlying loan portfolio and the cash flow it generates.

• Overall Loan Performance: Most loans within the trust performed as expected, with borrowers making timely payments.
• Delinquencies: A small portion of loans, representing approximately 3% of the outstanding balance, were 30-60 days delinquent.
• Special Servicing: Approximately 5 loans, totaling 8% of the outstanding balance, transferred to special servicing. This occurs when a loan faces payment default or imminent default. For instance, the Miami Design District, 250 West 57th Street, and Coleman Highline loans were already under special servicer management due to performance concerns.
• Credit Metrics: Investors typically evaluate individual loan risk using metrics like Loan-to-Value (LTV) and Debt Service Coverage Ratio (DSCR). These detailed metrics, along with property-specific information, are available in supplemental servicer reports, which are essential for a comprehensive view.

For a CMBS trust, "revenue" primarily comes from interest income collected on mortgage loans, plus any prepayment penalties or other fees. "Profit" represents the net income after deducting trust expenses, such as servicing, trustee, and administrative fees, before distributions are made to certificate holders. Servicers earn fees paid from the trust's cash flow, which constitutes its primary expense.

Management Discussion (MD&A Highlights)

As a passive CMBS trust, BANK 2021-BNK31 does not have traditional "management" making strategic operational decisions. Instead, the "management discussion" for such an entity focuses on how designated servicers and the trustee oversee and administer the loan portfolio.

• Servicer Roles and Changes: Managing a large pool of mortgage loans is a complex task, involving several parties who handle day-to-day operations, payment collection, and problem resolution. These are called "servicers," and their performance directly influences the trust's stability and investor returns.
  • Wells Fargo Bank, National Association initially served as the master servicer and primary contact for many loans. They also act as the "certificate administrator" (managing investment certificates) and "custodian" (holding loan documents).
  • Trimont LLC assumed the role of master servicer and primary servicer for many loans during 2021. Such a change can indicate a strategic shift, a contractual transition, or a need for more specialized oversight.
  • Special Servicers: These entities intervene when a loan encounters difficulties, such as a borrower's inability to make payments. Rialto Capital Advisors, LLC handles this for some loans (e.g., Miami Design District, 250 West 57th Street, and Coleman Highline), while Greystone Servicing Company LLC manages others (e.g., 605 Third Avenue and McDonald’s Global HQ).
  • Midland Loan Services (a division of PNC Bank) also became a special servicer for specific loans in 2021, taking over from Greystone for those assets.
  • Wilmington Trust, National Association acts as the "trustee," overseeing the entire operation to ensure compliance with the trust's governing documents and protect certificate holders' interests.
  • Other companies, like CoreLogic Solutions, LLC and Computershare Trust Company, National Association (CTCNA), provide support for specific administrative tasks, such as tax payments.
• Impact of Servicer Actions: The effectiveness of master and special servicers in managing the loan portfolio and resolving distressed assets (e.g., through loan modifications, foreclosures, or property sales) is crucial for minimizing investor losses. Their actions directly affect the trust's cash flow and distributions to certificate holders. The transfer of loans to special servicing, as noted in the Financial Performance section, demonstrates active management of underperforming assets.

Financial Health

BANK 2021-BNK31's financial health is directly tied to the performance of its underlying commercial mortgage loans and its ability to generate sufficient cash flow to meet its obligations and distribute funds to certificate holders.

• Assets: The trust's primary assets are its commercial mortgage loans, with an outstanding balance of approximately $1.1 billion as of December 31, 2021. The quality and performance of these assets are paramount to the trust's stability.
• Liabilities (Debt): The trust's "debt" consists of the various classes of CMBS certificates issued. These certificates represent investors' claims on the cash flow from the loan pool. The total original principal balance of these certificates was approximately $1.2 billion, matching the original loan pool. The outstanding balance of the certificates decreases as principal payments are made on the underlying loans.
• Cash Flow and Liquidity: The trust generates liquidity from the scheduled principal and interest payments received from its underlying mortgage loans. This cash flow first covers servicing fees, trustee fees, and other administrative expenses. The remaining funds are then distributed to certificate holders according to a predefined payment hierarchy, often called a "waterfall structure." The trust's ability to maintain liquidity depends on timely loan payments and the servicers' effectiveness in managing delinquencies and defaults.

Future Outlook

As a passive CMBS trust, BANK 2021-BNK31 does not offer traditional forward-looking guidance or strategic plans like an operating company. Its future outlook depends entirely on the performance of its underlying commercial mortgage loans and the broader commercial real estate market.

• Loan Performance: The trust's future cash flow and distributions will be driven by the continued performance of its loan portfolio, including the successful resolution of any currently delinquent or specially serviced loans. Factors such as property market conditions, borrower financial health, and the effectiveness of special servicing actions will directly influence future principal and interest receipts.
• Market Conditions: Future economic trends, interest rate movements, and changes in commercial property values (especially in sectors and regions where the trust has significant concentrations) will impact borrowers' ability to refinance or sell properties. This, in turn, affects loan maturities and the potential for prepayments or defaults.
• Servicer Actions: The ongoing management by master and special servicers, including any loan modifications, foreclosures, or sales of Real Estate Owned (REO) properties, will shape the trust's future financial results.

The trust's core "strategy" remains to hold its designated pool of commercial mortgage loans and distribute payments to certificate holders in accordance with its governing agreement.

Risk Factors

Investors in CMBS trusts face several inherent risks that are crucial to understand:

• Default Risk: The primary risk is that underlying borrowers may default on their mortgage payments, potentially leading to losses for the trust. This risk increases with concentrations in specific property types or geographic areas, as highlighted by the largest loans.
• Property Market Risk: A downturn in commercial real estate values, particularly in sectors like office or retail, could negatively impact the collateral securing the loans. Economic slowdowns or shifts in consumer behavior can directly affect property income and values, making it harder for borrowers to repay or refinance.
• Interest Rate Risk: While many CMBS are fixed-rate, changes in interest rates can affect property values and refinancing options for borrowers, especially as loans approach maturity. Rising rates could make refinancing more difficult or costly, increasing default risk.
• Prepayment Risk: If loans are paid off early (e.g., due to refinancing at lower rates or property sales), investors might receive their principal back sooner than expected, potentially at lower reinvestment rates.
• Servicer Performance Risk: The effectiveness of master and special servicers in managing the loan portfolio and resolving distressed assets directly impacts investor returns. Ineffective management can worsen losses.
• Concentration Risk: A high concentration of loans in a single property type, geographic region, or to a single borrower (as seen with the top loans) means that issues with one or a few properties can disproportionately affect the trust's overall performance.
• Interconnected Risk: As some loans are part of larger "loan combinations" with other trusts, issues affecting a single property can create ripple effects across multiple investment vehicles.

For a complete understanding of the trust's financial health and performance, investors should consult the original prospectus (for detailed risk factors at issuance) and ongoing servicer reports. These reports, often found on platforms like Bloomberg or Trepp, provide granular, loan-level data on delinquencies, special servicing transfers, property valuations, and other critical metrics. This 10-K offers a structural overview, but those supplemental reports provide real-time performance data.

Competitive Position

The concept of "competitive position" does not apply to BANK 2021-BNK31. As a passive Commercial Mortgage-Backed Securities (CMBS) trust, it functions as an issuing entity that holds a static pool of commercial mortgage loans and distributes cash flows to investors. It does not engage in competitive business activities, seek market share, or compete with other entities for customers or services. Its performance is solely determined by the quality and performance of its underlying collateral and the efficiency of its appointed servicers and trustee, rather than by any competitive advantage in a market.