Billionaire Palantir CEO Alex Karp — who  recently made headlines for a controversial manifesto posted on X about how the US should adapt to AI — is building a massive waterfront compound in Miami Beach, Gimme Shelter can reveal.  Karp has now shelled out almost $75 million on property alone with 265 feet on the water — joining a group of California titans who appear to be hedging their bets on Florida as the Golden State weighs in on a proposed tax on billionaires . Karp just shelled out $28.5 million for a waterfront teardown at 29 East San Marino Drive in the Venetian Islands, sources told Gimme Shelter. Alex Karp is expanding his footprint in Miami Beach. Getty Images Karp just closed on a $28.5 million teardown (left) that’s adjacent to a $46 million property he also owns (right).…