Billionaire Ken Griffin Plans Personal Mega-Yacht Marina on Miami Beach’s Terminal Island

Key Points

• $77M site purchase: Billionaire investor Ken Griffin acquired a 3.71-acre waterfront site at 120 MacArthur Causeway.

• Private marina concept: The proposed One Island Park project includes space for 3–6 yachts, four new buildings, and full-time staff operations.

• Personal use only: This marina won’t be open to the public — it’s strictly for Griffin, his guests, and private events like Art Basel or the Miami Grand Prix.

Why It Matters

Billionaire hedge fund titan Ken Griffin is expanding his Miami footprint again — this time with a private mega yacht marina proposal on Terminal Island, strategically located between South Beach and PortMiami.

The project, called One Island Park, is set to go before Miami Beach's Planning Board on November 4 and could add another ultra-luxury element to Miami’s booming waterfront redevelopment scene.

Project Breakdown: One Island Park

Prime Location with Rare Access

• Address: 120 MacArthur Causeway, Miami Beach

• Site size: 3.71 acres, approximately 1,400 feet of shoreline

• Previous owner: Related Group (initially planned for an office building)

• Purchase price: $77 million in 2023

• Owner: One Island Park LLC, tied to Ken Griffin

What's Proposed

• Yacht Marina:

  • 3 to 6 slips for mega yachts (Griffin owns the 308-foot Viva)

  • Not open to the public

  • 24/7 staffing, 10 employees per shift

• Buildings totaling 36,935 square feet:

  • Guardhouse with secure access

  • Marine crew pavilion: kitchen, laundry, gym, rooftop pool

  • Owner’s pavilion: office, lounge, private pool

  • Marina operations building

  • Recreational courts for pickleball and padel

• Parking: 11 spaces on-site

• Also under review by Miami-Dade’s Shoreline Review Committee

Bigger Picture: Griffin’s Miami Strategy

Ken Griffin has significantly increased his South Florida presence. He moved Citadel’s headquarters from Chicago to Miami in 2022 and is planning a landmark office and hotel complex on Brickell Bay Drive.

He has also assembled approximately 6.5 acres of property on Star Island, one of Miami Beach’s most exclusive neighborhoods. His philanthropy includes major donations to local institutions such as Nicklaus Children’s Hospital, Mount Sinai Medical Center, Baptist Health, and the University of Miami Health System.

Griffin’s expanding portfolio now spans luxury homes, corporate real estate, and marine infrastructure — a rare trifecta for a single private investor in Miami.

What This Signals

• Private Control of Coastal Assets: High-net-worth individuals are now customizing waterfront infrastructure at scale, often bypassing public use.

• Lower Impact Than Office Use: The marina may generate less local traffic and infrastructure strain than the previously proposed office building.

• Market Influence: Griffin’s aggressive and diversified investment into Miami real estate could influence other institutional buyers and ultra-wealthy individuals to follow suit.

Capital Buys Exclusivity

Griffin’s development is more than a marina — it’s a signal of what’s to come. As luxury capital continues to target Miami’s coastline, expect heightened competition for scarce waterfront parcels, with exclusivity becoming the new standard.