$16,000,000
4 bd · 3 ba · 2,304 sq ft · Single Family Residence
1 E Sister Rck Is, Marathon FL 33050
For Sale · Active listing
Est. payment $88,625/mo · Mortgage calculator
Listed by Compass Florida, LLC / Vladimir Rochebrun
Contact: 305-690-5851 (listing contact).
Shown through Slice Realty. Requests from this page reach Slice Realty / Propiedad Futura, not the listing agent.
About this home
Own an entire private island in the Florida Keys, just ¼ mile offshore from Marathon! East Sister Rock Island offers extraordinary privacy surrounded by turquoise waters, yet is only minutes from the mainland. The property encompasses approx. 6.5 acres, including approx. 5.8 acres of surrounding seabed, creating an exceptional marine setting for snorkeling, swimming, kayaking, paddleboarding, fishing and watersports. The beautifully updated 3-bedroom, 2-bath main residence and detached guest house offer over 5,000 total SF of living and entertaining space. Recent renovations include an updated kitchen with gorgeous countertops and modern finishes. A 12-ft-wide wraparound veranda captures panoramic water views, sunrises and spectacular Keys sunsets. Amenities include a waterfront pool and spa, tropical landscaping, outdoor entertaining areas, and a 100-ft deep-water dock. Self-sufficient infrastructure includes solar and wind power, battery storage, backup generator, desalination system and freshwater cistern capacity. Private helipad provides additional access. Seller is open to select Joint Venture opportunities.
Facts
- MLS #
- A12069701
- Subdivision
- Off Shore Island
- Property type
- Residential
- Property subtype
- Single Family Residence
- Sq. ft.
- 2,304
- Price per sq. ft.
- $6,944 / sq ft
- Year built
- 2015
- Days on market
- 34
- County
- Monroe County
- Date listed
- Aug 12, 2026
- Last updated
- Sep 15, 2026
Financial considerations
- Taxes
- $25,482 (2025)
Exterior features
- Waterfront
- Yes
- View
- Ocean, Direct Ocean
- Construction
- Concrete Block Construction
- Roof
- Metal Roof
- Additional features
- Lighting, Fruit Trees
Interior features
- Heating
- Solar
- Cooling
- Central Air
- Appliances
- Dishwasher, Dryer, Electric Range, Microwave, Other Equipment/Appliances, Refrigerator, Solar Hot Water, Trash Compactor, Wall Oven, Washer
- Window features
- Complete Impact Glass, Hurricane Shutters
- Additional features
- First Floor Entry, Built-in Features, Closet Cabinetry, 3 Bedroom Split, Family Room
Additional features
- Community
- Boating
Mortgage calculator
Includes principal and interest, taxes and insurance.
Rate: Freddie Mac 30-year average (2026-10-15). Estimate only.
Local context (our analysis)
Area stats are available for our covered neighborhoods. See neighborhoods.
Source: Southeast Florida MLS (SEFMLS). Last updated Sep 15, 2026, 5:18 PM ET
Listing data is deemed reliable but is not guaranteed accurate by the MLS. Information is provided for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.