That may be one of the sheds they added for backup generators. In 1988 as part of the safety sweep they added flood lights to each of the Skyride towers and generators in sheds at the base of each one. The Parachuter's Perch also had them added. Any time power goes out to the park they all kick on. I assume that's why the towers have not been fully removed as well. When things would "get bad" during Fright Fest they would also turn them on.