After flipping up a framed photograph of two cabaret girls on the wall, you're greeted with the sight of a hidden window, which slides open just a few moments after you knock on the wood. You can see what looks to be a small gathering of people smoking, drinking and playing 8-ball on a pool table behind him. Hey! You must be here for the, uh...party, hehe. The man flashes a grin before pointing to the right. Go down the hallway, there's a sliding door.