COPT shareholders elect all 10 trustees, approve say-on-pay, ratify auditor

Proposal 3: Advisory Vote to Approve Compensation of Named Executive Officers 102,032,681 2,427,364 81,357 1,902,367 Votes Cast Broker Non-Votes For Against Abstain

Proposal 4: Ratification of the Appointment of PricewaterhouseCoopers LLP as Independent Registered Public Accounting Firm for the Current Fiscal Year 101,496,756 4,878,615 68,398 N/A

Proposal 2: Advisory Vote on Frequency of Future Advisory Votes on Executive Compensation 102,121,146 35,299 2,318,916 66,041 N/A Votes Cast Broker Non-Votes For Against Abstain

On May 11, 2023, Corporate Office Properties Trust (the “Company”) held its 2023 Annual Meeting of Shareholders. At such meeting, the shareholders voted on proposals relating to: • the election of ten trustees, each for a one-year term; • an advisory vote on the frequency of future advisory votes on executive compensation; • an advisory vote to approve the compensation of the Company’s named executive officers as disclosed in its proxy statement filed on March 30, 2023; and • the ratification of the appointment of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting firm for the current fiscal year. The voting results at the meeting were as follows: Proposal 1: Election of Trustees Name of Nominee Shares For Shares Against Shares Withheld Broker Non-Votes Thomas F. Brady 99,033,619 5,430,976 76,807 1,902,367 Stephen E. Budorick 102,202,922 2,271,995 66,485 1,902,367 Robert L. Denton, Sr. 97,810,183 6,650,124 81,095 1,902,367 Philip L. Hawkins 103,372,077