Go straight and pass the stairs going up. Head toward the stairs going down and go down the steps. After you go down turn left and wait by the table and chairs.
Walk around the circular glass panels to the right and continue down the stairs. At the bottom of the stairs, turn left and wait in front of the glass table.
With the window to your right, head forward to the stairs leading down. Climb down to the bottom of those stairs and then at the bottom, turn left and take three more steps downwards.