Go down the stairs to the main entryway and turn left. Stop in the entryway to the office on the left.
Go down the stairs and stop wen you are in the middle of the stairways. Turn right and go down the stairs towards the front door. Turn left and go towards the room with the desk and bookshelf. Your final destination is in the entryway of that room.
Walk down the stairs and turn right at the plant. Walk down the stairs and turn left. Walk into the room and stop in the doorway.