Walk outside the door, and turn right. Walk all the way forward towards the end room on your left. Enter inside the room, and stop near the staircase.
Turn right to walk out of the bathroom.Walk straight past the sink on the left and the open doorway. Turn left through the doorway and walk to the staircase. Pause as the staircase.
With the sink behind you, walk through the door in front of you. Turn right, and walk to the double doors on your left. Go through those doors, walking up to the staircase.