It was built as the winter White house it definitely has an underneath . https://therealdeal.com/miami/2017/04/13/did-you-know-mar-a-lagos-has-three-bomb-shelters/
I was a land surveyor in that very county. Your right many places don't have basements.
It was built by Marjorie Merriweather Post (the cereal heir). It was not built to be the winter white house.
Respectfully, it was built for the heiress who later donated it to the govt in "hopes" it would be used as the winter white house. That only occurred in the 1970s.
Doesn't Flarda have a lot of karst topography?
Yes, much of it.
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