Right now you're facing towards a wall. Now slightly turn left and climb up the stairs. Now again turn left and climb up the steps completely. Now turn left, there are two open doors in front of you, move towards the open door which is to your left and slightly turn left. Now pass through the open door, you can see an another open door in front of you, move towards the door and pass through it. Now turn left, there is a chair in front of you, move towards the chair and cross the chair. Now stand in front of the window and it is your end point.