You begin looking over an L-shaped tan couch and a shag rug. Turn around to your right and enter the hallway. Keep going past the initial two doors, and keep following along the railing on your left side until you hit a staircase upwards. Ascend the staircase. You're going straight through that door at the top that opens up for you, and making an immediate left turn. Once you are standing on the... On the roof, by the two A/C units, you're done.