Walk up the stairs on the left side of the room. On the landing, turn right and go up that set of stairs. Walk into the big room and stop.
Turn left and walk up the steps in the corner. Turn right and walk up more steps. Once at the top, stop beside the desk to your left.
Exit the room via the steps with no guardrail. Then keep going through a doorway up the next set up steps. Stop at the top of the steps, next to the computer desk.