Note: An unpatched version of the game is required. In "The Crane", jump on the fence after climbing on the vent cover. Go across the fence and jump to the other side of the horizontal fence, then turn left and go to the end. Jump up and to the right to an air conditioning unit box on the corner of the next building. Once on the next building, go to the left corner and jump to the top branch of the tree below you. You will lose plenty of health after landing. However, you will be at the next safe room.