People are speculating that the darker building is for ventalation, but I'm thinking it's a 2 generator system the 2 pipes that stick up above the roof line. The one on the left appears to have the exhaust flap up meaning its running and the other is a back up.

https://invidio.us/watch?v=wrFQxqt0Y1I :

Epstein's Pedophile Island, Little St. James USVI Drone July 2019 9 - YouTube

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