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This building is found between Old North Church and Pickman Gallery. There is a sign above that says Madden's and the entrance is a light green door. It is made up of one large room. There is a boxing ring in the middle of the room. On the left hand side is what used to be an office with a safe inside. Over on the right hand side is a weightlifting space, complete with various weights.
- In the corner next to an ice chest, a toy alien can be found "lifting" a 160 pound dumbbell. There is a bottle of Buffout sitting next to him.
The boxing gym only appears in Fallout 4.