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The entrance is located directly south of Faneuil Hall, past a door with an Advanced lock on the south side. There is also an access point through a gap in the wall to the elevator. Both guarded by two raiders and one turret. It is also possible to gain entry from the south side through a gap in the fence and an unlocked door. There are two accessible floors to this building and the roof.
The first floor is just a stairwell. At the top of the stairwell on the third floor is a locked (Advanced) restroom with a first aid box. The third floor contains two terminals. The Easy locked one grants control to a police protectron. Behind the counter in a small vestibule is the Expert locked terminal that controls the main bank vault.
In the small office opposite the protectron is a Novice locked safe. There are two elevators. The one on the right goes up to the roof exit where the MILA needs to be installed. An exit door leads to a ruined walkway over the Financial District. It is possible to enter the building on the third floor via this walkway from the adjacent Haymarket Mall.
The Commonwealth Bank appears only in Fallout 4.
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