Behind some meager fortifications, the mall opens to a main lobby with a staircase leading to the second floor. Through the door marked for "employees only" there are some Protectron pods and a maintenance room, as well as a door that leads to he Congress Street garage, and a staircase leading to the second floor. The second floor holds a few rooms, the eastern most of which contains an armor workbench and weapons workbench.
An elevator is on the western wall of the second floor and leads up to the eighth floor, which is protected by a few Protectrons. A collapsed floor allows access to the Haymarket Mall roof and the garden terrace, a hop, skip and jump from the broken monorail.
Haymarket Mall appears only in Fallout 4.