You can enter the building through the 10 High Street entrance or the 155 Federal Street entrance.
Garage at Post Office Square
Enter at 130 Congress Street or 55 Pearl Street. Exit by foot on Franklin Street and take a right onto Franklin Street, crossing over Congress Street. Turn left onto Federal Street. The entrance to 155 Federal Street will be on your right just before High Street.
125 Summer Street Garage
Enter on Lincoln Street. Exit by foot onto Summer Street and cross Summer Street onto High Street. The 10 High Street entrance will be on your left, or you can take a left onto Federal Street and enter through the 155 Federal Street entrance on your left.