X0303 4 2010-02-11 0001037540 BOSTON PROPERTIES INC BXP 0001217093 BURT FRANK D C/O BOSTON PROPERTIES, INC. 800 BOYLSTON STREET BOSTON MA 02199 0 1 0 0 Senior Vice President Common Stock, par value $.01 2010-02-11 4 M 0 4121 0 A 9207 D LTIP Units 2010-02-11 4 M 0 4121 .25 D Common Stock 4121 6559 D 4,121 of the Reporting Person's LTIP Units in Boston Properties Limited Partnership (BPLP), of which the Issuer is the sole general partner, were converted into common units of limited partnership interest (Common OP Units) in BPLP by the Reporting Person and the Common OP Units were immediately redeemed for an equal number of shares of Common Stock of the Issuer in accordance with BPLP's Partnership Agreement. Represents units of limited partnership interest in BPLP issued as long term incentive compensation pursuant to the Issuer's equity based compensatory programs. Conditioned upon minimum allocations to the capital accounts of the LTIP Units for federal income tax purposes, each LTIP Unit may be converted, at the election of the holder, into a Common OP Unit. /s/ Kelli A. DiLuglio, as attorney-in-fact 2010-02-16