Gulffront Paradise Asking $33.5 Million Sets a New Standard for Ultra-Luxury Living in the Grassy Key
Set along one of the most secluded waterfront corridors in the Middle Keys, 57783 Morton St emerges as a newly completed architectural statement on the edge of the Gulf of Mexico. Listed at US$33.5 million, this expansive 10-bedroom, 11-bathroom estate spans nearly 8,000 square feet of interior space and rests on a rare 1.18-acre parcel with more than 200 feet of private Gulf frontage. In a region where waterfront intimacy and open-water panoramas shape the essence of daily life, the home in Grassy Key for sale elevates the concept of coastal luxury to a new level, combining resilience, scale, and seclusion with a private-resort sensibility.
A Dramatic Rebirth Rooted in the History of Grassy Key
The journey of 57783 Morton St is one of remarkable transformation. Originally sold in 2018 for approximately US$1.59 million, the previous structure was eventually removed to make way for a bolder architectural vision. Completed in 2025 by Alderuccio Corporation, the new residence embraces a concrete-elevated building philosophy that reflects the modern priorities of Gulffront construction: durability, storm resilience, and seamless engagement with the natural environment. Rather than simply replacing what came before, the developer reimagined the site entirely, shaping a home that expresses strength in form while drawing in light, water, and horizon at every turn.
The result is a monumental Gulf-facing estate that mirrors the movement of contemporary coastal design across Florida, homes that are at once sculptural and protective, open yet anchored, engineered for longevity while celebrating the emotional impact of living beside endless water.
A Private Resort Within the Gulf of America
Inside, 57783 Morton St offers approximately 7,934 square feet of living space across two levels, arranged to prioritize privacy, natural light, and fluid indoor–outdoor flow. Instead of a traditional layout, the home is divided into three distinct finished wings, allowing the estate to function much like a private boutique resort. This spatial concept enables multi-generational living, long-term hosting, or the ability to create separate programmatic zones, such as wellness, entertainment, or extended-stay guest quarters, without compromising the intimacy of the main residence.
Floor-to-ceiling impact-rated glass spans the facades, framing the Gulf in uninterrupted vistas. Wide terraces, shaded balconies, and generous alfresco living platforms extend the interior outward, encouraging a quiet rhythm of sunrise contemplation and sunset gathering. The architectural palette of concrete, glass, and coastal tones provides a neutral backdrop for the play of Gulf light throughout the day.
Amenities echo the resort character of 57783 Morton St, anchored by a heated gunite pool, spa, outdoor shower, and integrated barbecue set within expansive waterfront patios. The Grassy Key home for sale’s practical side is equally well considered, with three garage bays, extensive additional parking, and designated boat or RV spaces, an essential feature in the boating culture of the Florida Keys.
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Waterfront Experience
What distinguishes 57783 Morton St most profoundly is its rare 200-foot private waterfront, a stretch of shoreline that ensures panoramic open-water views and uncompromised privacy. The seawall and navigable waterfront allow direct access to the Gulf, making the property ideal for fishing excursions, reef diving adventures, offshore cruising, or quiet evening sails. In a region where waterfront access is among the most coveted assets, the scale and usability of this shoreline elevate the estate into a category of its own.
Sunlight over the Gulf becomes part of the residence’s daily choreography: morning reflections across calm water, midday brilliance, and evenings punctuated by vast, cinematic sunsets. Few homes in the Keys offer such an immersive visual relationship with open water, and almost none at this magnitude.
An Intimate Island with a Deep Sense of Place
While 57783 Morton St delivers profound seclusion, it also benefits from its setting on Grassy Key, a compact island known for its natural beauty, gentle pace, and strong connection to the marine environment. Incorporated into the city of Marathon in 1999, Grassy Key retains its small-island identity with protected landscapes, tidal estuaries, and quiet residential pockets that appeal to those seeking privacy without sacrificing access to everyday conveniences.
For boating enthusiasts, nearby Grassy Key Marina serves as a hub for marine activity, offering wet slips, dry storage, rentals, and essential services. The island also hosts the renowned Dolphin Research Center, a longtime attraction that contributes to the broader cultural and scientific fabric of the Keys. Although discreet, Grassy Key’s position along the Overseas Highway ensures smooth connectivity to restaurants, markets, marinas, and air travel via Marathon or Key West.
SEE MORE: Exquisite $11.3 Million Contemporary Estate with Resort-Style Luxury in Boca Raton
A Standout in the Florida Keys Luxury Segment
In the landscape of Middle Keys real estate, 57783 Morton St stands in a category of its own. The asking price equates to roughly US$4,222 per square foot, positioning the home at the upper tier of the entire 33050 market. The dramatic price appreciation from its 2018 sale reflects both the extraordinary redevelopment and the surging demand for large-scale waterfront compounds across the Keys.
Most properties in the region offer modest footprints or shared shorelines. By contrast, the sheer acreage, privacy, architectural ambition, and waterfront capacity of 57783 Morton St place it closer to the rare ultra-luxury compounds typically found in Islamorada or the Lower Keys. For buyers seeking a self-contained sanctuary, one that fuses Gulf exposure, contemporary craftsmanship, and expansive living, this home answers a demand seldom met in the Middle Keys.
A Vision of Elevated Coastal Living
Represented by Brett Harris of Bespoke Real Estate Florida LLC, 57783 Morton St has been described by the listing agent as “a resilient elevated retreat built for the modern connoisseur.” Speaking with Luxury Houses Magazine, Harris elaborated: “We envisioned a home that isn’t just about square footage, but about how one lives, where every sunrise and sunset over the Gulf becomes part of the daily rhythm. The owner spared no expense. From the structural concrete to the impact glass to the three separate wings, this is coastal luxury reimagined, designed to weather storms and host generations.”
A Rare Jewel at the Edge of the Gulf
More than a residence, 57783 Morton St is an elevated expression of what Gulffront living in the Florida Keys can be: private yet connected, expansive yet intimate, architecturally confident yet deeply tied to its natural surroundings. For buyers seeking a home that feels like a lifelong sanctuary, a place where the horizon becomes part of daily life, this Grassy Key masterpiece stands as one of the most compelling offerings in Florida luxury real estate. To know more about this Grassy Key real estate, view on Zillow listing.
For inquiries or to schedule a private showing, please contact:
Brett Harris
305-764-9401
Bespoke Real Estate Florida LLC
* This property might not for sale at the moment you read this post; please check property status at the above Zillow or Agent website links*
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