Billionaire Ken Griffin's $250 million superyacht wouldn't fit at his mansion, so he built a 3.7-acre private marina in Miami. Now he wants a private helipad and fly in to avoid rush-hour traffic

Hedge fund billionaire Ken Griffin has already gotten permission to build a private marina (Waterfront facility) for his 308-foot superyacht on Miami's Terminal Island. Now he wants Miami Beach to go a step further by changing its zoning rules so he can add a private waterfront helipad and avoid the city's traffc.

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