Continue to the bottom of the stairs and turn left. Continue down the hallway with the windows and doors leading to the outside towards your right. You'll eventually reach two steps leading upwards. Climb those steps and then stop.
Go down the stairs, and take a left. Walk down the hall and go up the first set of two stairs. Stop before you reach the doors to the patio.
Walk forward and then turn left. Walk straight down the hallway. Once you go up the first set of 2 steps, stop in front of the black doors leading to outside.