BRANDYWINE REALTY TRUST

Item 1.05 Material Cybersecurity Incidents. On May 1, 2024, Brandywine Realty Trust (the “Company”) detected what was determined to be a cybersecurity incident, whereby a third party gained unauthorized access to portions of its information technology (“IT”) environment. Upon detecting the unauthorized occurrences, the Company promptly initiated its previously established response protocols and began taking steps to contain, assess and remediate the incident, including beginning an investigation with leading external cybersecurity experts, activating its incident response plan, shutting down some systems and notifying law enforcement. The cybersecurity incident consisted of unauthorized access and deployment of encryption by a third party to a portion of the Company’s internal corporate IT systems. The incident caused disruptions to, and limitation of access to, portions of the Company’s business applications supporting aspects of the Company’s operations and corporate functions, including financial and operating reporting systems. Based on the information reviewed to date, the Company believes the unauthorized activity has been contained and is working diligently to bring the impacted portions of its IT systems back online. Although the Company ascertained that certain files were exfiltrated, it is still investigating the extent of any sensitive information contained within the accessed IT systems, including any personal information. The Company is evaluating what, if any, regulatory and legal notifications are required as a result of this incident and will issue such notifications based on its findings. As the investigation of the incident is ongoing, the full scope, nature and impact of the incident are not yet known. The Company’s real estate operations have continu