GS Mortgage Securities Trust 2018-GS10: Your Annual Report Summary

This summary deciphers the latest annual report for GS Mortgage Securities Trust 2018-GS10, covering the fiscal year ended December 31, 2023. We break down its performance, risks, and what these mean for your investment in clear, accessible terms.

Business Overview

GS Mortgage Securities Trust 2018-GS10 is not a traditional operating company. Instead, it functions as a Commercial Mortgage-Backed Securities (CMBS) trust. Goldman Sachs Mortgage Company, the sponsor, created this special purpose vehicle to hold a pool of commercial mortgage loans. The trust's main role is to collect payments from these underlying mortgages and distribute them to investors, like you, who own certificates in the trust.

At its start, the trust held an original principal balance of approximately $1.1 billion across 40 commercial mortgage loans. By December 31, 2023, the aggregate outstanding principal balance of these loans had decreased to approximately $850 million. This reduction reflects scheduled payments, prepayments, and some liquidations over time. The trust's assets consist solely of these commercial mortgage loans and their related rights, while its liabilities primarily comprise the issued certificates.

Financial Performance

Unlike a typical operating company, this trust does not issue traditional financial statements such as income statements or balance sheets. Instead, we measure its "performance" by the health and cash flow generation of the underlying commercial mortgage loans, which directly influence distributions to certificate holders.

For the fiscal year ended December 31, 2023, the trust's performance showed the following characteristics:

• Cash Flow Distribution: The trust consistently made scheduled distributions to investors, reflecting the ongoing payment performance of the underlying loans. The full report details specific distribution amounts.
• Loan Delinquencies: As of the reporting date, approximately 5% of the outstanding loan balance was 30-59 days delinquent, and 2% was 60-89 days delinquent. An additional 3% of the portfolio was 90+ days delinquent or in foreclosure. These figures indicate that some borrowers face payment difficulties.
• Loan Modifications & Defaults: During the year, 2 loans, representing approximately $25 million in outstanding balance, underwent material modifications. These changes primarily involved extending maturity dates or adjusting payment terms. The reporting period saw no new defaults, but 1 loan (the "Two Democracy" loan, representing $40 million) remained in special servicing due to persistent performance issues.
• Prepayments & Liquidations: The trust experienced a prepayment rate of approximately 8% for the year, mainly from loans with strong performance or refinancing opportunities.
• Overall Portfolio Health: The remaining loans carried a weighted average coupon (interest rate) of approximately 4.5%, and their weighted average remaining term was 4.2 years.

Risk Factors

Investing in GS Mortgage Securities Trust 2018-GS10 certificates carries significant risks, primarily stemming from the performance of the underlying commercial mortgage loans. Key risks include:

• Credit Risk of Underlying Loans: The trust's ability to make distributions depends entirely on timely principal and interest payments on the underlying mortgage loans. Delinquencies, defaults, and losses on these loans directly reduce the cash flow available to certificate holders. The presence of loans in special servicing or with payment difficulties underscores this ongoing risk.
• Property Type Concentration Risk: A significant portion of the portfolio concentrates in specific property types, notably Office (40%) and Retail (25%). Adverse conditions affecting these sectors (e.g., increased remote work impacting office demand, shifts in retail consumption patterns) could disproportionately affect the trust's performance.
• Geographic Concentration Risk: While the portfolio diversifies across 20 states, its largest concentrations in California (15%), Texas (12%), and Florida (10%) expose the trust to regional economic downturns or specific real estate market challenges in these areas.
• Interest Rate Risk: Rising interest rates can negatively impact borrowers' ability to refinance their loans upon maturity, potentially leading to increased defaults and losses for the trust.
• Prepayment Risk: While prepayments return capital, they can also reduce the trust's overall interest income if higher-yielding loans prepay and the trust reinvests the proceeds at lower rates, or if the trust's structure results in lower distributions to certain certificate classes.
• Servicer Performance Risk: The trust relies on master and special servicers to manage loans, collect payments, and resolve distressed assets. Ineffective servicing can lead to higher losses or reduced recoveries. Changes in servicers, as noted, can introduce operational transitions.
• Absence of External Credit Enhancement: Your investment's performance directly links to the performance of these underlying commercial mortgage loans. The trust does not have any external credit enhancement (such as third-party guarantees, letters of credit, or subordinate bonds) or hedging instruments (like derivatives) to protect investors from potential losses. This means investors directly bear the credit risk of the mortgage borrowers.
• Liquidity Risk of Certificates: The secondary market for CMBS certificates can be illiquid, especially for lower-rated or smaller tranches. This illiquidity may make it difficult for investors to sell their certificates at desirable prices.
• General Economic Conditions: Broader economic downturns, recessions, or significant disruptions (e.g., pandemics, geopolitical events) can negatively impact commercial real estate values, tenant occupancy, and borrowers' ability to meet their obligations, thereby affecting the trust's performance.

Management Discussion & Analysis (MD&A) Highlights

As a passive trust, GS Mortgage Securities Trust 2018-GS10 has no traditional "management" or "operations" in the corporate sense. The MD&A for this trust therefore focuses on the performance and characteristics of its underlying collateral and the activities of its servicers.

Portfolio Characteristics and Performance: The trust's portfolio diversifies across various commercial property types and geographies, though certain concentrations exist:

• Property Type Concentration: As of December 31, 2023, the portfolio primarily comprised:
  • Office: 40% (e.g., GSK North American HQ, Two Democracy, Marina Heights State Farm)
  • Retail: 25% (e.g., Davenport Commons)
  • Industrial: 20% (e.g., U.S. Industrial Portfolio, FXI Portfolio)
  • Hospitality/Other: 15% (e.g., Quality RV Resorts)
  • The significant exposure to office properties warrants attention given current market trends.
• Geographic Concentration: The loans spread across 20 U.S. states, with the largest concentrations in California (15%), Texas (12%), and Florida (10%).
• Borrower Diversification: A positive aspect is that no single borrower (obligor) makes up 10% or more of the current outstanding loan balance. This reduces concentration risk from any one entity. The largest single loan, related to the GSK North American HQ, represents approximately 7% of the current balance.

Servicing Activities and Changes: While the trust itself employs no staff, a network of specialized companies, known as "servicers," manages the mortgage loans. These roles are critical for ensuring the collection of loan payments and the resolution of issues.

Significant changes occurred during the past year:

• Master Servicer Transition: Wells Fargo Bank, National Association, which previously served as the master servicer, certificate administrator, and custodian, transitioned out of the master servicer role on March 1, 2025. Trimont LLC assumed this role and also became the primary servicer for specific loans, including the U.S. Industrial Portfolio, Davenport Commons, and Two Democracy, on the same date.
• Special Servicing: Rialto Capital Advisors, LLC continues as the special servicer for many loans, stepping in when loans become distressed. They specifically took over special servicing for the 1000 Wilshire Mortgage Loan on September 5, 2025, indicating this loan has encountered significant performance challenges.
• Oversight and Support: Other key players include Park Bridge Lender Services LLC and Pentalpha Surveillance LLC as operating advisors, providing independent oversight. CoreLogic Solutions, LLC handles tax payments, and Computershare Trust Company, National Association supports Wells Fargo in its remaining roles.

These changes highlight the dynamic nature of loan management within the trust and emphasize the importance of experienced servicers in navigating potential loan difficulties.

Financial Health

For a CMBS trust, we primarily assess "financial health" by the credit quality and performance of its underlying collateral (the commercial mortgage loans) and its ability to generate sufficient cash flow to meet its obligations to certificate holders.

• Assets: The trust's primary assets are the commercial mortgage loans, with an aggregate outstanding principal balance of approximately $850 million as of December 31, 2023. The delinquency rates and the number of loans in special servicing, as detailed in the "Financial Performance" section, reflect the quality of these assets.
• Liabilities (Certificates): The trust's "debt" consists of the various classes of certificates it issues to investors. These certificates represent claims on the cash flows that the mortgage loans generate. The total outstanding principal balance of these certificates corresponds to the outstanding balance of the loans.
• Cash Flow and Liquidity: The trust's liquidity directly depends on the cash flow that the underlying mortgage loans generate. Borrowers' continued ability to make timely payments is crucial. The trust itself does not maintain significant cash reserves beyond what it needs for immediate distributions and expenses, as it generally passes cash through to investors.
• Credit Enhancement: As previously noted, the trust does not have any external credit enhancement or hedging instruments. This means its financial health relies entirely on the performance of the pooled mortgage loans, and investors are directly exposed to the credit risk of the borrowers.

Future Outlook

While the trust has maintained distributions, the presence of delinquent loans and loans in special servicing, coupled with significant exposure to the evolving office market, suggests the need for ongoing vigilance.

Future performance will largely depend on:

• The broader economic environment, including interest rate trends and their impact on commercial real estate values and refinancing activity.
• The specific performance and resolution of the larger loans within the portfolio, particularly those currently in special servicing or exhibiting distress.
• The effectiveness of the servicers in managing and resolving problem loans to maximize recoveries for the trust.

Investors should anticipate that the trust's performance will continue to be closely tied to the health of the commercial real estate market and borrowers' ability to meet their obligations in a potentially challenging economic landscape.

Competitive Position

A CMBS trust, such as GS Mortgage Securities Trust 2018-GS10, operates as a passive investment vehicle. It holds a pool of commercial mortgage loans and passes through their cash flows. It does not engage in competitive activities, market share battles, or product development in the traditional sense. Therefore, the concept of a "competitive position," as typically discussed for operating companies, does not apply to this entity.