Corporate Office Properties Trust (“COPT” or the “Company”) (NYSE: OFC) announced that its operating partnership, Corporate Office Properties, L.P. (the "Operating Partnership"), has priced an offering of $250 million aggregate principal amount of 5.25% senior unsecured notes due February 15, 2024 (the "Notes") at a price equal to 98.783% of the principal amount. The Notes will be senior unsecured obligations of the Operating Partnership and will be fully and unconditionally guaranteed by COPT. The Operating Partnership intends to use the net proceeds from the offering of the Notes to repay borrowings under its senior unsecured revolving credit facility and for general corporate purposes. The sale of the Notes is expected to close on September 16, 2013, subject to customary conditions. Wells Fargo Securities, LLC, Barclays Capital Inc. and Citigroup Global Markets Inc. are acting as joint book-running managers. Copies of the prospectus supplement, when available, and the accompanying prospectus relating to the Notes may be obtained without charge from Wells Fargo Securities, LLC, 1525 West W.T. Harris Blvd. NC0675, Attn: Capital Markets Client Support, (800) 326-5897 or by email at firstname.lastname@example.org; Barclays Capital Inc. c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717, (888) 603-5847 or by email at email@example.com; or Citigroup Global Markets Inc., c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717, (800) 831-9146 or by email at firstname.lastname@example.org. A copy of the prospectus supplement and accompanying base prospectus may also be obtained without charge by visiting the SEC website at www.sec.gov. This announcement shall not constitute an offer to sell or the solicitation of an offer to buy the Notes or related guarantee nor shall there be any sale of the Notes 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.