
Constellation Group, The Boschetti Group, and Vietmar
59720 Overseas Highway, Grassy Key (Marathon), Florida 33050
SeaGlass Cove brings a set of substantial single-family homes to Grassy Key in Marathon, a quieter stretch of the Florida Keys along the Overseas Highway. The residences run four to five bedrooms across more than 4,800 square feet on three stories, each with a two-car garage.
The project is a joint effort by Constellation Group, The Boschetti Group, and Vietmar. It is currently under construction, with the earliest residences completed in 2024.
Marathon sits at the midpoint of the Florida Keys, and life on Grassy Key leans heavily on the water and the outdoors. Everyday needs, dining, and marine services are found along the Overseas Highway corridor that runs through the city, while the surrounding Keys offer fishing, boating, diving, and beach access that define the region's lifestyle. For specifics on the closest shops, schools, and services, buyers should confirm current options directly, as the immediate area is largely residential and resort in character.
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The Overseas Highway (US-1) is the single road that threads the Florida Keys together, and SeaGlass Cove sits directly on it at Grassy Key. That highway connects Marathon north toward Islamorada and Key Largo and south to Key West, and is the primary route for residents traveling anywhere in the island chain. Marathon also has a general-aviation airport nearby for regional flights.
SeaGlass Cove is being developed by Constellation Group, The Boschetti Group, and Vietmar, working together on this Florida Keys community. The partners bring their combined experience to residential development in South Florida. Prospective buyers are encouraged to review the team's portfolio and confirm project details directly with the developers.
Buying a new single-family home like those at SeaGlass Cove often begins with registering early for access to floor plans, pricing, and the first release of homes. Getting on the list ahead of a public launch can matter when a limited number of residences are available.
Purchase agreements for new construction typically involve a deposit paid in stages, followed by a closing once the home is complete and ready for occupancy. Because SeaGlass Cove is a collection of single-family houses rather than condominium units, Florida's statutory condominium rescission period does not apply here; the specific terms are set out in the purchase contract.
Review any agreement carefully and consider independent legal and financial advice before signing. Deposit structures and other specifics will be confirmed by the developers.
SeaGlass Cove is a single-family home development on Grassy Key in Marathon, Florida, in the Florida Keys. It is being built by Constellation Group, The Boschetti Group, and Vietmar.
The community offers four- and five-bedroom homes of more than 4,800 square feet, laid out over three stories and including a two-car garage.
Pricing starts from $3,000,000 CAD. Final pricing and availability should be confirmed directly with the developers, as figures can change during a sales program.
The project is under construction, and the first residences were completed in 2024. Timing for remaining homes will be confirmed by the builder.
The community is at 59720 Overseas Highway on Grassy Key in Marathon, Florida (33050), directly along US-1 in the middle Florida Keys.
SeaGlass Cove is a joint development by Constellation Group, The Boschetti Group, and Vietmar.
You can register your interest to receive updates on availability, floor plans, and pricing. A representative will follow up with the current details as the sales program progresses.
Information last updated July 24, 2026. Details are provided by the builder and may change without notice.
First access to pricing, floorplans, and availability — before the public.