A penthouse at 450 Alton Road in Miami Beach sold for $23.5 million on July 24, 2026. Eddy Martinez and Roland Ortiz of One Sotheby's International Realty represented both the seller and the buyer.
A penthouse of approximately 9,000 square feet at 450 Alton Road in Miami Beach sold for $23.5 million on July 24, 2026. The sellers, a trust tied to Yves Mongeau and Sylvie Guilbault, had held the six-bedroom residence since 2013, when they acquired it for $15 million. The buyer took title as Akron Warwick Exchange LLC.
Eddy Martinez and Roland Ortiz of One Sotheby's International Realty represented both sides of the transaction. Dual representation at this level is uncommon and tends to indicate a relationship-sourced buyer rather than an open-market process.
The trade returns roughly fifty-seven percent over a thirteen-year hold, a rate of appreciation that sits below the compressed gains recorded across Miami Beach in the years immediately following 2020.