Built into Fizztop Mountain, the Grille was once one of the most popular restaurants in the amusement park, bar none. Reknowned for the quality of its food, it has come a long way since and not in the good sense of the expression. Notably, the Mountain was taken over by Colter, for use as his private residence as he ruled over the Nuka-World with an iron fist.
There is a lift in front of Fizztop Mountain that takes one up to the semi-circular patio built into the bar, which hosts the restaurant and bar. The bar has been converted into the Overboss's sleeping quarters, with a power armor station, bed, Expert-locked safe and steamer trunk in the east, and a kitchenette with a chemistry station in the west. Doors at the base of the mountain and behind the bar leading inside the restaurant.
The ground floor entrance leads into a reception area, with an elevator in the corner. This leads to the restaurant, which has been made into the Overboss's main quarters. The main room holds a bed, another power armor station, a weapons workbench, an armor workbench, and Colter's personal terminal.
Off to the sides are a couple bathrooms, a hallway that leads out onto the patio, and a kitchen. The kitchen contains a chemistry station and a cooking stove, as well as an adjacent storage room.
There is a fusion core in the Overboss's sleeping quarters, on the bedside table.