Brandywine Operating Partnership 8-K Brandywine Realty Trust Prices $350 Million of 7.550% Guaranteed Notes Due 2028

Exhibit 99.1

Company / Investor Contact: Tom Wirth EVP & CFO 610-832-7434 tom.wirth@bdnreit.com

Brandywine Realty Trust Prices $350 Million of 7.550% Guaranteed Notes Due 2028

PHILADELPHIA, PA, December 6, 2022 — Brandywine Realty Trust (the “Company”) (NYSE:BDN) announced today that its operating partnership, Brandywine Operating Partnership, L.P. (the “Operating Partnership”), has priced an underwritten public offering of $350 million of its 7.550% guaranteed notes due 2028 (the “Notes”). Interest on the Notes will be payable semi-annually on March 15 and September 15 of each year, commencing March 15, 2023.

The Notes are being offered to investors at a price of 99.058% of their principal amount, plus accrued interest, if any, from December 13, 2022, with a re-offer yield of 7.776%. The sale of the Notes is expected to close on December 13, 2022, subject to customary closing conditions.

The net proceeds of the offering, after deducting underwriting discounts and estimated transaction expenses related to this offering, are expected to be approximately $344.1 million. The Operating Partnership intends to use the net proceeds of the offering to repurchase or redeem the $350 million outstanding principal amount of its 3.95% Guaranteed Notes due February 15, 2023 and for general corporate purposes, which may include the repayment, repurchase or other retirement of other indebtedness.

The joint book-running managers for the offering are BofA Securities, Inc., Citigroup Global Markets Inc., PNC Capital Markets LLC, Truist Securities, Inc., U.S. Bancorp Investments, Inc. and Wells Fargo Securities, LLC. The senior co-managers for the offering are BNY Mellon Capital Markets, LLC, Citizens Capital Markets, Inc., M&T Securities, Inc. and TD Securities (USA) LLC. The co-managers for the offering are Samuel A. Ramirez & Company, Inc. and Synovus Securities, Inc.

This offering is being made pursuant to an effective shelf registration statement and related prospectus and preliminary prospectus supplement filed by the Company with the Securities and Exchange Commission. This press release shall not constitute an offer to sell or the solicitation of an offer to buy any securities nor will there be any sale of these securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction.

Copies of the prospectus supplement and prospectus relating to the offering may be obtained from BofA Securities, Inc., Attn: Prospectus Department, 200 North College Street, NC1-004-03-43, Charlotte, NC 28255-0001 or by email at dg.prospectus_requests@bofa.com or by calling toll-free 1-800-294-1322; and Citigroup Global Markets Inc., c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717, telephone: 1-800-831-9146 or e-mail: prospectus@citi.com.

About Brandywine Realty Trust

Brandywine Realty Trust (NYSE: BDN) is one of the largest, publicly traded, full-service, integrated real estate companies in the United States with a core focus in the Philadelphia, Austin and Washington, D.C. markets. Organized as a real estate investment trust (REIT), we own, develop, lease and manage an urban, town center and transit-oriented portfolio comprising 164 properties and 23.0 million square feet as of September 30, 2022, which excludes assets held for sale. Our purpose is to shape, connect and inspire the world around us through our expertise, the relationships we foster, the communities in which we live and work, and the history we build together. For more information, please visit www.brandywinerealty.com.

Forward-Looking Statements

This press release contains certain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Such forward-looking statements can generally be identified by our use of forward-looking terminology such as “will,” “strategy,”

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“expects,” “seeks,” “believes,” “potential,” or other similar words. Because such statements involve known and unknown risks, uncertainties and contingencies, actual results may differ materially from the expectations, intentions, beliefs, plans or predictions of the future expressed or implied by such forward-looking statements. These forward-looking statements are based upon the current beliefs and expectations of our management and are inherently subject to significant business, economic and competitive uncertainties and contingencies, many of which are difficult to predict and not within our control. Such risks, uncertainties and contingencies include, among others: risks related to the impact of COVID-19 and other potential future outbreaks of infectious diseases on our financial condition, results of operations and cash flows and those of our tenants as well as on the economy and real estate and financial markets; reduced demand for office space and pricing pressures, including from competitors, that could limit our ability to lease space or set rents at expected levels or that could lead to declines in rent; uncertainty and volatility in capital and credit markets, including changes that reduce availability, and increase costs, of capital; the effect of inflation and interest rate fluctuations, including on the costs of our planned debt refinancing; the potential loss or bankruptcy of tenants or the inability of tenants to meet their rent and other lease obligations; risks of acquisitions and dispositions, including unexpected liabilities and integration costs; delays in completing, and cost overruns incurred in connection with, our developments and redevelopments; disagreements with joint venture partners; unanticipated operating and capital costs; uninsured casualty losses and our ability to obtain adequate insurance, including coverage for terrorist acts; asset impairments; our dependence upon certain geographic markets; changes in governmental regulations, tax laws and rates and similar matters; unexpected costs of REIT qualification compliance; and costs and disruptions as the result of a cybersecurity incident or other technology disruption. The declaration and payment of future dividends (both timing and amount) is subject to the determination of our Board of Trustees, in its sole discretion, after considering various factors, including our financial condition, historical and forecast operating results, and available cash flow, as well as any applicable laws and contractual covenants and any other relevant factors. Our Board’s practice regarding declaration of dividends may be modified at any time and from time to time. Additional information on factors which could impact us and the forward-looking statements contained herein are included in our filings with the Securities and Exchange Commission, including our Form 10-K for the year ended December 31, 2021. We assume no obligation to update or supplement forward-looking statements that become untrue because of subsequent events except as required by law.

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