The main building that houses the restaurant, bar, spa and lobby of the adults-only, all-inclusive Bungalows resort in Key Largo was destroyed after a large fire raged there early Sunday morning. Firefighters continued to pour water on the smoldering remains of the building Monday afternoon at the mile marker 99 bay side resort, which is closed until further notice, according to its website. “The upstairs is completely destroyed,” Chief Don Bock, with the Key Largo Volunteer Fire Department, said Monday. “And, the downstairs has a lot of water damage.” The cause of the fire, which started around 4:30 a.m. Sunday, is under investigation by the state Fire Marshal.