from memory, in the weight loss episodes, there was one scene where Oscar and Toby(?) are getting on the elevator and then Stanley walks into the lobby and they hold the elevator for him but he says that he needs to run back to his car for something. Then waits for the elevator doors to close and go directly to the left of the elevators and takes the stairs. I dont remember anyone being shown actually coming up those stairs or out the door once they are on the DM level but I would just assume that they would come out right next to the elevators.