Enter this location on East Side Dr. From the intersection of W Side Dr. and Summer St., head Southeast on Summer St. towards D St. Turn right to enter East Side Dr. at 385-399 Summer St. Head South through East Side Dr. you reach the Garage behind 425 Summer St. The garage is underneath the Westin Seaport District Hotel and next to the Boston Convention and Exhibition Center. Follow the circle drive at the front of the hotel until you reach the parking garage ramp, which is marked by a blue 'P' sign with white lettering.