A series of back-rooms, actually. Getting back here requires passing a bouncer that has no qualms about knocking people senseless, so good luck. Upstairs, there's a plushly-appointed office that looks through a one-way window to the dance floor below. There's a private bar, well-stocked, and invitation-only, high-stakes poker games are played now and then. In the basement, there's a place where... well, let's just say, there's a reason for the drain in the middle of the tiled floor; it smells like bleach in there, too.
There are also places for employees only - a stock-room and an employee break room, but the employees here know better than to go where they shouldn't be.