Boston Properties Inc. announced that holders of the 3.75% Exchangeable Senior Notes due 2036 of its operating partnership, Boston Properties Limited Partnership, have the right to surrender their Notes for purchase by the Operating Partnership pursuant to their option (the Put Right) under the Indenture governing the Notes, dated as of December 13, 2002, as supplemented by Supplemental Indenture No. 5, dated as of April 6, 2006 (the Supplemental Indenture and, together with the Base Indenture, the Indenture)). Boston Properties Inc. announced that Boston Properties Limited Partnership issued a notice of redemption to the holders of the Notes to redeem, on May 18, 2013 (the Redemption Date), all of the Notes outstanding on the Redemption Date pursuant to its option under the Indenture. In connection with the redemption, holders of the Notes have the right to exchange their Notes prior to 5:00 p.m., New York City time, on May 16, 2013 in accordance with the terms of, and for the consideration set forth in, the Indenture. Notes with respect to which the Put Right is not exercised (or with respect to which the Put Right is exercised and subsequently withdrawn prior to the withdrawal deadline) and that are not surrendered for exchange prior to 5:00 p.m., New York City time, on May 16, 2013, will be redeemed by the Operating Partnership on the Redemption Date at a redemption price equal to 100% of the principal amount of the Notes plus accrued and unpaid interest thereon to, but excluding, the Redemption Date. As of April 15, 2013, there was approximately $450,000,000 aggregate principal amount of the Notes outstanding.

On April 11, 2013, Boston Properties Inc.’s operating partnership, Boston Properties Limited Partnership, completed the issuance and sale of $500 million aggregate principal amount of the company’s 3.125% Senior Notes due 2023. The net proceeds to the company from the sale of the Notes, after deducting underwriting discounts and estimated transaction expenses, are estimated to be approximately $492.5 million. The company plans to use the net proceeds from the offering for general business purposes, which may include investment opportunities and debt reduction. The Notes were issued under the Indenture, dated as of December 13, 2002, between the company and The Bank of New York Mellon Trust Company, N.A. (as successor to The Bank of New York), as supplemented by Supplemental Indenture No. 13 dated as of April 11, 2013. The offer and sale of the Notes were registered with the Securities and Exchange Commission pursuant to a registration statement on Form S-3 (File No. 333-176157-01) under the Securities Act of 1933, as amended (the “Securities Act”).

Boston Properties Limited Partnership entered into an underwriting agreement with Citigroup Global Markets Inc., Deutsche Bank Securities Inc., Merrill Lynch, Pierce, Fenner & Smith Incorporated and Morgan Stanley & Co. LLC, as managers of the several underwriters named in Schedule II thereto, whereby the company has agreed to sell and the Underwriters have agreed to purchase from the company, subject to and upon the terms and conditions set forth in the Underwriting Agreement, $500,000,000 aggregate principal amount of 3.125% Senior Notes due 2023 to be issued by the company. The company expects to complete the issuance and sale of the Notes on April 11, 2013.