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Slice RealtyPropiedad Futura

$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.

Loan amount$12,800,000
Total cost of mortgage$31,904,861
Monthly payment$88,625

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.