Date
Details
Price
Change
Source
8/12/2026
Listed
$16,000,000
—
MLS
Disclaimer: Historical sales information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.
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1/25
$16,000,000
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Property Description
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.
Full Property Details
Full Property Details for 1 E Sister Rck Island
General
- Price: $16,000,000
- Taxes: $25,482 (2025)
- Status: Active
- Type: Single Family
- Source: Greater_Miami
- MLS ID: A12069701
- Updated: 8/12/2026
- Added to Site: 10 day(s) ago
Interior
- Interior Features: First Floor Entry, Built-in Features, Closet Cabinetry, 3 Bedroom Split, Family Room
- Fireplace: Yes
- Fireplace(s): Fireplace
- Appliances: Dishwasher, Dryer, Electric Range, Microwave, Other Equipment/Appliances, Refrigerator, Solar Hot Water, Trash Compactor, Wall Oven, Washer
- Flooring: Other, Tile
Rooms
Bathrooms
- Total Bathrooms: 3
- Full Bathrooms: 3
Bedrooms
- Total Bedrooms: 4
- Bedroom Features: Entry Level, Primary Bath Shower
Other Rooms
- Living Room: Family Room, Guest House Sq. Ft.
- Eat-in kitchen: Yes
- Dining Room: Dining/Living Room, Eat-In Kitchen
Additional Information
- Pool: Yes
- Pool Description: In Ground, 16x39
- Equipment: Satellite Dish
Exterior
- Exterior Features: Lighting, Fruit Trees
- Deck/Patio: Deck, Open Porch, Wrap Around
Parking
- Parking Features: None
Location
- Area: Off Shore Island
- County: Monroe County
- Subdivision: Off Shore Island
- Building Name: Off Shore Island
- Direction Faces: East
Community
- Community Name: Off Shore Island
Heating & Cooling
- Air Conditioning: Yes
- Cooling Type: Central Air
- Heating Type: Solar
Utilities
- Sewer: Septic Tank
- Water: Other
Structural Information
- Architectural Style: Detached, One Story
- Structure Type: House
- Detached/Attached: Detached
- Construction: Concrete Block Construction
- Roof: Metal Roof
- Windows: Complete Impact Glass, Hurricane Shutters
- Doors: High Impact Doors
- Building Size: 5760
- Square Feet: 2,304
- Living Area: 2,304 Sq. Ft.
- Year Built: 2015
Additional Structures
- Other Structures: Guest House
Lot Features
- Property View: Ocean, Direct Ocean
- Lot Size (Sq. Ft.): 280,628
- Frontage Feet: 800
- Lot Features: 5 To Less Than 10 Acre Lot
- Zoning: 0S
Water Features
- Water Front: Yes
- Water Front Desc.: Ocean Access, Navigable Water, Ocean Front
Financial Considerations
- Price Per Sq. Ft.: $6,944.44
- Tax Amount: $25,482
- Tax Year: 2025
- Terms: All Cash, Conventional
Disclosures and Reports
- Legal Description: 23 66 32 LOT 2 (US PATENT 1186533) EAST SISTER ROCK AND ADJACENT BAY BOTTOM G71-513(II DEED 20369) OR374-139/40 OR752-1640 OR752-1642 OR755-
- Restrictions: No Restrictions
- Inclusions: Deeded Dock, Dock Available, Private Dock, Unrestricted Salt Water Access
- Property ID: 00105590-000000
Listed by Compass Florida, LLC
We Value Your Privacy
We Value Your Privacy
We Value Your Privacy
Listing agents
— 1 E Sister Rck Island —
Compass Florida, LLC
Compass Florida, LLC
NMLS#: 1598647Get Pre-Approved Today
Schools
Schools serving 1 E Sister Rck Island
School District:Monroe County School District, Middle Torch Key, FL
Disclaimer:
School attendance boundaries provided by ATTOM Data Solutions and are for reference only. Contact the school directly to verify enrollment eligibility.
Price & Sales History for 1 E Sister Rck Island
Estimate the Cost
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1 E Sister Rck Is, Marathon, FL 33050 (MLS# A12069701) is a Single Family property with 4 bedrooms and 3 full bathrooms. 1 E Sister Rck Is is currently listed for $16,000,000 and was received on August 12, 2026. Want to learn more about 1 E Sister Rck Is? Do you have questions about finding other Single Family real estate for sale in Marathon? You can browse all Marathon real estate or contact a Coldwell Banker agent to request more information.