X0202 4 2006-04-03 0001037540 BOSTON PROPERTIES INC BXP 0001217098 KOOP BRYAN J C/O BOSTON PROPERTIES, INC. 111 HUNTINGTON AVENUE BOSTON MA 02199 0 1 0 0 Senior Vice President Common Stock, par value $.01 2006-04-03 4 M 0 20000 39.33 A 31281.7704 D Common Stock, par value $.01 2006-04-03 4 S 0 500 92.48 D 30781.7704 D Common Stock, par value $.01 2006-04-03 4 S 0 5200 92.47 D 25581.7704 D Common Stock, par value $.01 2006-04-03 4 S 0 1300 92.46 D 24281.7704 D Common Stock, par value $.01 2006-04-03 4 S 0 13000 92.45 D 11281.7704 D Employee Stock Option (right to buy) 39.33 2006-04-03 4 M 0 20000 0 D 2011-01-18 Common Stock 20000 18854 D In October 2005, the issuer paid a special dividend of $2.50 per share of common stock to all stockholders of record as of the close of business on September 30, 2005. In connection with this special dividend, the issuer's Board of Directors adjusted all options that were awarded, but not exercised, prior to the ex-dividend date for the special dividend to account for the effect of the special dividend. The number of shares subject to each such option was increased and the exercise price correspondingly decreased such that each option had the same fair value to the holder before and after giving effect to the payment of the special dividend. Pursuant to this adjustment, the number of shares underlying Mr. Koop's options increased by 1,354 from 37,500 to 38,854 and the per share exercise price was correspondingly decreased. The options vested in three equal annual installments beginning on January 18, 2002. /s/ Kelli A. DiLuglio, as Attorney-in-Fact 2006-04-05