X0305 4 2012-05-22 0001043121 BOSTON PROPERTIES LTD PARTNERSHIP N/A 0001229890 BACOW LAWRENCE S HARVARD GRADUATE SCHOOL OF EDUCATION 420 GUTMAN HALL, 13 APPIAN WAY CAMBRIDGE MA 02138 1 0 0 0 LTIP Units 2012-05-22 4 A 0 823 .25 A Common OP Units 823 2231 D Issued as long term incentive compensation pursuant to Boston Properties, Inc.'s, the Issuer's general partner, equity based incentive 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 unit. The 823 LTIP Units will vest on the earlier of (i) May 22, 2013 and (ii) the date of Boston Properties, Inc.'s 2013 annual meeting of stockholders. /s/ Kelli A. DiLuglio, as Attorney-in-Fact 2012-05-24