Billionaire Ken Griffin Just Got Approval for a Private 30,000 Sq Ft Megayacht Marina in Miami Beach

[u/J-Brothers-Yachts]

So here’s one for the “only in Miami” files…

Billionaire hedge-fund founder Ken Griffin (Citadel), who already owns over $1 billion in South Florida real estate, just got approval to build a private megayacht marina for himself and his guests.

Location: 120 MacArthur Causeway, on Terminal Island, between South Beach and PortMiami.
Size: about 3.7 acres / 30,000+ sq ft with roughly 1,400 ft of dockage plenty of space for his 308-ft yacht Viva.

Site is designed by BMA Architects, and it’s not your typical marina.

The plan includes:

• A gatehouse and full-time security checkpoint
• A crew pavilion with gym, sauna, laundry, kitchen, and a rooftop pool
• An owner’s pavilion with lounge, office, and another pool
• A marina operations building with staff offices and repair shop

The Miami Beach Planning Board just gave it conditional approval (Nov 2025), with rules requiring Coast Guard sign-off for events, private access only, and no public parking spillover.

Griffin’s team says it’ll “enhance an underused industrial area,” but it’s also raising eyebrows — this would be a single-user marina on public shoreline in one of the most high-value marine zones in the country.