Privacy has become one of the most valuable luxuries in today’s real estate market, but true private island ownership remains exceptionally rare, particularly in the Florida Keys. Positioned just off the coast of Marathon, East Sister Rock Island presents an opportunity that comes along perhaps once in a generation, combining the exclusivity of an island estate with the convenience of nearby mainland access. Surrounded by brilliant turquoise waters and reached by boat or private helicopter, the 6.5-acre property offers a lifestyle defined by uninterrupted ocean views, exceptional recreation, and remarkable self-sufficiency.
Listed for $16 million by Vladimir Rochebrun and Aaron Rosenthal of The Chad Carroll Group at Compass, the offering also includes 99 E Ocean Drive on the mainland, providing private dock space that makes daily access both convenient and seamless.
An Island Designed for Coastal Living
East Sister Rock encompasses approximately 6.5 total acres, including 5.8 acres of privately owned surrounding seabed, creating an expansive aquatic playground that extends well beyond the shoreline. The protected waters invite snorkeling among tropical marine life, paddleboarding across calm turquoise shallows, kayaking through the surrounding Keys, or simply enjoying a swim in one of the most picturesque settings in South Florida.
Unlike many private islands that feel disconnected from everyday conveniences, East Sister Rock balances complete privacy with accessibility. Marathon’s restaurants, shopping, and airport remain just minutes away by boat, while the property’s private helipad provides an additional level of convenience for owners and guests arriving from elsewhere in Florida.
The combination allows residents to enjoy the tranquility of island living without sacrificing the flexibility expected of a modern luxury residence.
At the center of the island is an updated three-bedroom, two-bath main residence accompanied by a separate guest house, together offering more than 5,000 square feet of living space. The home’s interiors embrace a relaxed coastal aesthetic while incorporating contemporary finishes suited to modern entertaining.
The chef’s kitchen serves as the heart of the home, featuring premium countertops and thoughtfully selected finishes that complement the surrounding ocean setting. Throughout the residence, expansive windows frame panoramic Atlantic views, ensuring the water remains a constant focal point.
Perhaps the home’s defining architectural feature is its impressive 12-foot-wide wraparound veranda. Designed to blur the line between indoor and outdoor living, the expansive terrace offers front-row seating for spectacular Atlantic sunrises while also capturing the warm pastel sunsets that have made the Florida Keys famous.
The separate guest accommodations provide additional privacy for family and visitors, creating a compound well suited for extended stays or multigenerational gatherings.
Resort Amenities in Every Direction
Outdoor living naturally takes center stage on a private island, and East Sister Rock has been designed to maximize every moment spent outside.
A waterfront pool and spa overlook the surrounding turquoise waters, creating a resort-style setting where the horizon becomes part of the landscape. Tropical plantings soften the property while providing color and privacy throughout the grounds.Dedicated outdoor lounging areas encourage quiet afternoons by the water, while alfresco dining spaces make entertaining effortless beneath the island’s open skies. Whether hosting intimate dinners or larger celebrations, nearly every outdoor space enjoys unobstructed ocean views.
For boating enthusiasts, the property’s 100-foot deep-water dock accommodates multiple vessels, making fishing excursions, diving adventures, or day trips throughout the Keys exceptionally convenient.
Sustainable Luxury Without Compromise
While many luxury homes incorporate environmentally conscious features, East Sister Rock was engineered from the ground up to operate as a fully self-sufficient island estate.
The property is powered through an integrated combination of solar energy, wind generation, battery storage, and a backup generator that provides dependable energy independence. A desalination system converts seawater into fresh water, while generous freshwater cistern capacity further enhances the island’s resilience.
These systems allow owners to enjoy modern comforts while reducing dependence on traditional utilities, demonstrating how sustainability and luxury can successfully coexist in one of the country’s most environmentally sensitive coastal regions.
As climate resilience continues to shape luxury real estate, properties capable of operating independently are becoming increasingly attractive to buyers seeking both security and long-term sustainability.
A Legacy Property in the Florida Keys
Private island opportunities in the Florida Keys rarely reach the market, particularly those offering established residences, extensive infrastructure, mainland access, and protected surrounding waters.
East Sister Rock represents more than simply another waterfront home. It offers complete ownership of an island lifestyle where boating, diving, fishing, entertaining, and quiet relaxation become part of everyday life. Combined with its sustainable infrastructure, private helipad, deep-water dock, and sweeping Atlantic views, the property stands apart as one of the region’s most distinctive luxury offerings.
For buyers seeking a residence that delivers unmatched privacy while remaining connected to the natural beauty of the Florida Keys, East Sister Rock presents an opportunity to own a truly irreplaceable coastal retreat.
Listing: $16 million
Listed by: Vladimir Rochebrun & Aaron Rosenthal, The Chad Carroll Group at Compass
Photography: Resonate Media / The Chad Carroll Group