Jump on the fence after climbing on the vent cover. Go across the fence, then jump to the other side of the horizontal fence. Turn left, and go to the end. Jump up and to the right to the air conditioning unit box on the corner of the next building. Once on the next building, go to the left corner. Jump to the top branch of the tree below you. You will lose a lot of health after landing; however, you will be at the next safe room.