Exhibit 1

Report of Independent Accountants on Applying

Agreed-Upon Procedures

Barclays Capital Inc.

745 7th Avenue

New York, NY 10019

We (“us” or “PwC”) have performed the procedures enumerated below, which were agreed to by Barclays Capital Inc. (the “Company,” as the engaging party), and Barclays Commercial Mortgage Securities LLC, Barclays Capital Real Estate Inc., Goldman Sachs & Co. LLC, Goldman Sachs Bank USA, Goldman Sachs Mortgage Company, and Mesirow Financial, Inc., who are collectively referred to as the “Specified Parties”, solely to assist you in performing certain procedures related to the accuracy of certain attributes and calculations within the Final Data File (defined below). The procedures were performed with respect to the DATA 2026-800D Mortgage Trust, Commercial Mortgage Pass-Through Certificates, Series 2026-800D securitization (the “Transaction”). The Company (the “Responsible Party”) is responsible for the Transaction and the accuracy of the information contained in the Final Data File.

In an agreed-upon procedures engagement, we perform specific procedures that the Specified Parties have agreed to and acknowledged to be appropriate for the intended purpose of the engagement and we report on findings based on the procedures performed. The procedures performed may not address all the items of interest to a user of this report and may not meet the needs of all users of this report and, as such, users are responsible for determining whether the procedures performed are appropriate for their purposes. The Specified Parties have agreed to and acknowledged that the procedures performed are appropriate for their purposes. This report may not be suitable for any other purpose.

Procedures and Findings

In connection with the Transaction, the Specified Parties have requested that the procedures be performed on 1 mortgage loan (the “Mortgage Loan Asset”) secured by 1 mortgaged property (the “Mortgaged Property”, collectively with the Mortgage Loan Asset, the “Collateral”) within the Transaction.

This agreed-upon procedures engagement was not conducted for the purpose of satisfying any criteria for due diligence published by a nationally recognized statistical rating organization.

In addition, PwC should not be regarded as having in any way warranted or given any assurance as to the following items:

We have not performed any procedures with respect to the fair value of the securities being offered in the Transaction and PwC expresses no opinion on the fair value of these securities. PwC should not be regarded as having performed any procedures other than those detailed in this report.

With respect to any terms or requirements of the Transaction documents that do not appear in this report, we performed no procedures and, accordingly, the procedures we performed would not ensure that any requirements are satisfied. Further, we have performed only the following agreed-upon procedures and therefore make no representations regarding the adequacy of disclosures or whether any material facts have been omitted from the Transaction documents.

It should be understood that we make no representations as to:

These procedures should not be taken to supplant any additional inquiries or procedures that the Specified Parties would undertake in consideration of the Transaction.

For the purpose of this report:

Source Documents included in the Loan File:

The documents made available to us by the Company for purposes of performing the procedures may have included drafts, unsigned, or non-final versions. We have not verified that such documents were executed or represent the final agreed-upon terms, and did not perform any procedures to compare such documents to executed versions, if any. We did not validate, confirm, or review any signatures for authenticity. Accordingly, we make no representation regarding the completeness, accuracy, or finality of such documents.

The procedures performed and results thereof are described below. In performing this engagement, we received one or more preliminary data file(s) and performed certain procedures as set forth in Exhibit A and Exhibit B. The procedures identified differences, which were communicated to the Responsible Party. The Responsible Party revised one or more of the preliminary data files based on such communicated differences, where they determined it to be appropriate. We then performed these procedures on the Final Data File, and the results of those procedures are described below.

From May 22, 2026 through August 24, 2026, the Company provided us with the Source Documents related to the Collateral for which we:

The recalculation methodology associated with the Recalculated Attributes is listed in Exhibit B. For each procedure where a recalculation was performed, if necessary, we compared the underlying attributes to the corresponding Source Documents and found them to be in agreement. We did not perform any procedures denoted with a Source Document of “None - Company Provided”, in Exhibit A.

This agreed-upon procedures engagement was conducted in accordance with attestation standards established by the American Institute of Certified Public Accountants. We were not engaged to, and did

not conduct an audit or an examination engagement, the objective of which would be the expression of an opinion, or a review engagement, the objective of which would be the expression of a conclusion, on the Final Data File.  Accordingly, we do not express such an opinion or conclusion.  Had we performed additional procedures, other matters might have come to our attention that would have been reported to you.

In performing this engagement, we are required to be independent of the Responsible Party and to meet our ethical responsibilities, in accordance with the relevant ethical requirements related to our agreed-upon procedures engagement.

This report is intended solely for the information and use of the Specified Parties (including for the purpose of substantiating the Specified Parties' “due diligence defense” under the Securities Act of 1933), and is not intended to be and should not be used by anyone other than the Specified Parties.

If a party has obtained, or has access to, this report without having executed an agreement with PwC wherein such party accepts responsibility for the appropriateness of the procedures performed (such party is referred to as a “Non-Specified Party”), that Non-Specified Party cannot:

A Non-Specified Party may not disclose or distribute this report or any of the report’s contents to any

other party (including but not limited to electronic distribution and/or posting to a website pursuant to Rule 17g-5 of the Securities Exchange Act of 1934).

The procedures enumerated above were performed as of the date of this report, and we disclaim any consideration of any events and circumstances occurring after the date of this report. Further, we have no obligation to update this report because of events occurring, or data or information coming to our attention, subsequent to the date of this report.

/s/ PricewaterhouseCoopers LLP

New York, NY

August 25, 2026

Exhibits

Exhibit A – Loan File Review Procedures

Exhibit B – Recalculation Methodology

Exhibit A – Loan File Review Procedures

* The fields for the noted Specified Attributes were either not populated in the Final Data File or populated with the term “NAP”. As such, we were instructed by the Company to not perform any procedures on these Specified Attributes.

Exhibit B – Recalculation Methodology