DIVERSIFIED HEALTHCARE TRUST

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Trustees and Shareholders of Diversified Healthcare Trust

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Diversified Healthcare Trust (the "Company") as of December 31, 2024 and 2023, the related consolidated statements of comprehensive income (loss), shareholders' equity, and cash flows, for each of the three years in the period ended December 31, 2024, and the related notes and the schedule listed in the Index at Item 15(a) (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 25, 2025, expressed an unqualified opinion on the Company's internal control over financial reporting.

Basis for Opinion

These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matter

The critical audit matter communicated below is a matter arising from the current-period audit of the financial statements that was communicated or required to be communicated to the audit committee and that (1) relates to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

Impairment of Real Estate Properties -Refer to Note 3 to the financial statements

Critical Audit Matter Description

The Company's real estate properties are evaluated for impairment periodically or when events or changes in circumstances indicate that the carrying amount of a real estate property may not be recoverable. Impairment indicators may include declining tenant or resident occupancy, weak or declining profitability from the property, decreasing tenant cash flows or liquidity, the Company's decision to dispose of a property before the end of its estimated useful life, and legislative, market or industry changes that could permanently reduce the value of a property. If indicators of impairment are identified for any real estate property, the Company evaluates the recoverability of that real estate property by comparing undiscounted future cash flows expected to be generated by the real estate property over the Company's expected remaining hold period to the respective carrying amount. The Company's undiscounted future cash flows analysis requires management to make significant estimates and assumptions related to expected remaining hold periods, market rents, and terminal capitalization rates.

We identified the impairment of real estate properties as a critical audit matter, specifically the significant estimates and assumptions management makes to evaluate the recoverability of real estate properties. This required a high degree of auditor judgment and an increased extent of effort when performing audit procedures to evaluate the reasonableness of the significant estimates and assumptions related to expected remaining hold periods, market rents, and terminal capitalization rates within management's undiscounted future cash flows analysis which are sensitive to future market or industry considerations.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to the undiscounted cash flows analysis for each real estate property or group of properties with possible impairment indicators included the following among others:

•We tested the effectiveness of controls over management's evaluation of the recoverability of real estate properties, including the key assumptions utilized in estimating the undiscounted future cash flows.

•We evaluated the undiscounted cash flow analysis including estimates of expected remaining hold period, market rents, and terminal capitalization rates for each real estate property or group of properties with possible impairment indicators by (1) evaluating the source information and assumptions used by management and (2) comparing management's projections to external market sources and evidence obtained in other areas of our audit.

•We evaluated the reasonableness of management's undiscounted future cash flows analysis by developing an independent expectation of future undiscounted cash flows based on third party market data and compared that independent estimate to the carrying amount of the real estate property or group of properties with possible indicators of impairment. We compared our analysis of the recoverability of the real estate property or group of properties to the Company's analysis.

•We made inquiries of management about the current status of potential transactions and about management's judgments to understand the probability of future events that could affect the expected remaining hold period and other cash flow assumptions for the properties.

/s/Deloitte & Touche LLP

Boston, Massachusetts

February 25, 2025

We have served as the Company's auditor since 2020.

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Trustees and Shareholders of Diversified Healthcare Trust

Opinion on Internal Control over Financial Reporting

We have audited the internal control over financial reporting of Diversified Healthcare Trust (the “Company”) as of December 31, 2024, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control — Integrated Framework (2013) issued by COSO.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated financial statements as of and for the year ended December 31, 2024, of the Company and our report dated February 25, 2025, expressed an unqualified opinion on those financial statements.

Basis for Opinion

The Company's management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management Report on Assessment of Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company's internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control over Financial Reporting

A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ Deloitte & Touche LLP

Boston, Massachusetts

February 25, 2025