Right now you are on the stair case, walk all the way down through the stairs, now you can find two washing machines on the right side, now keep moving forward, you can find two closed doors, now turn right and go straight, you will find frame on the wall, go near the frame and turn right, you will find a step, go through the step, on the left side you will find a closed room, on the right side you will find lift, stand in between them, that will be your final destination.