Five agencies fought a structure fire on Adams Key on Friday, Nov. 6, after an unoccupied building on the remote Biscayne Bay island was found fully engulfed in flames.

Miami-Dade Fire Rescue received the call at 10:52 p.m. and dispatched four units, including Fireboat 21, Fireboat 73 and Air Rescue South, according to the Islander News. Biscayne National Park staff, the Florida Fish and Wildlife Conservation Commission (FWC), the Ocean Reef fireboat and the Miami-Dade Sheriff's Office Marine Patrol also responded.

Adams Key sits about 20 miles south of Key Biscayne and can be reached only by boat. Crews had to travel by water to reach the property, while Air Rescue South assessed the scene from overhead.

When firefighters arrived, intense flames and heavy black smoke were pouring from the structure, Local 10 reported. The building was already fully engulfed. Crews worked to extinguish the blaze and keep it from spreading to nearby structures.

No injuries were reported. The cause remains under investigation, according to Miami-Dade Fire Rescue.

The island, now a day-use area in Biscayne National Park with a picnic pavilion, a short trail, a boat dock and ranger housing closed to the public, has a storied past. It was once home to the Cocolobo Cay Club, a private retreat that hosted Presidents Warren G. Harding, Herbert Hoover, Lyndon Johnson and Richard Nixon, according to Keys Weekly.

American entrepreneur Carl G. Fisher built the club by 1918. In the 1950s, a group of investors led by Key Biscayne banker Bebe Rebozo, a close friend of Nixon, bought the property and renamed it the Coco Lobo Fishing Club.

The main club building burned down on Dec. 21, 1974, after the property was incorporated into what is now Biscayne National Park. The remaining auxiliary structures were destroyed by Hurricane Andrew in 1992.

Authorities have not identified the specific structure that burned Nov. 6 or named a cause.