Silver's hideout is located somewhere beneath Central Park. It is where Silver and his gang of Monkey Thieves hang out and where Silver stashes his ill-gotten gains.
The main chamber has rock climbing walls, vines hanging from the ceiling, trees, a chess board floor, antique thirteenth century rug and a long staircase leading down from a smaller room. Scattered around the main chamber are paintings, rugs, vases, statues and other indications that Silver likes the finer things in life. There are other rooms leading off of the main chamber.
One of those spaces is Silver’s office, which is also quite large. Stairs lead down to where Silver has his desk and beneath and behind the staircase is a smaller room with a door, though it is not shown where that door leads. In front of the desk, the space opens out and is filled with boxes, crates and furniture. At least two other doorways can be seen. This space does not have rock climbing walls.
The interior décor changes from episode to episode, as items are moved around, added, or taken away.