Enter the northwest teleporter. Walk forward, and the red key will be blocked off. Flip both switches in the southeast, and drop into the hall. Go through either of the doors in the north, and hit the switch. Run to the lift in the southeast, and ride it. Flip the switch in the east, and enter the southwest teleporter. Grab the red key, and take the next teleporter. Run forward, and open any of the red bars. Step onto the teleport pad, and then travel around the building to the northeast of the map. Walk under the wide shadow, and the cliff will lower. Hit the switch, and run to the northwest of the level. Press on the door.
Other points of interest
At the start of the level, open the eastern wall with exposed circuitry to find a box of shells. (sector 77)
Outside the building, hidden within the inner, southwest side of the structure is a soul sphere. (sector 239)