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

• 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.
• If approved, the plan would create a private travel system by air, sea, and land for the Citadel found