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1 E Sister Rck Is, Marathon FL 33050

House For Sale
$16,000,000

BTC: 205.61588383

ETH: 6,666.66666667

10 days
Waterfront
4 bds
3 ba
2,304 sqft

Overview

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.

Location

Details

Type:
Residential
Parking:
None
Year Built:
2015
Lot:
280628 Square Feet
Heating:
Solar
Price/sqft:
$6,944
Cooling:
Central Air
HOA:
No Data

Highlights

Annual tax
$25,482
2025
Pool
In Ground
View
Ocean, Direct Ocean
Waterfront
Ocean Access, Navigable Water
All facts and features
  • Flooring

    • Other

    • Tile

    Heating

    • Solar

    Cooling

    • Central Air

    Appliances

    • Dishwasher

    • Dryer

    • Electric Range

    • Microwave

    • Other Equipment/Appliances

    • Refrigerator

    • Solar Hot Water

    • Trash Compactor

    • Wall Oven

    • Washer

    Other interior features

    • First Floor Entry

    • Built-in Features

    • Closet Cabinetry

    • 3 Bedroom Split

    • Family Room

    Bedrooms and bathrooms

    • Bedrooms: 4

    • Full bathrooms: 3

  • Parking

    • None

    Property

    • Exterior Features: Lighting / Fruit Trees

    Lot

    • Lot: 280628 Square Feet

    Other Property Information

    • Parcel Number: 00105590-000000

    • Zoning: 0S

  • Type and style

    • Property Type: Residential

    • Property Sub Type: Single Family Residence

  • Other financial information

    • Annual tax amount: $25,482

  • Source details

    • MLS ID: A12069701

    Other facts

    • Construction Materials: Concrete Block Construction

    • Fireplace Features: Fireplace

    • Lot Features: 5 To Less Than 10 Acre Lot

    • Patio And Porch Features: Deck / Open Porch / Wrap Around

    • Pool Features: In Ground

    • Window Features: Complete Impact Glass / Hurricane Shutters

    • Direction Faces: East

    • Other Structures: Guest House

    • Architectural Style: Detached / One Story

    • Waterfront: Yes

    • Fireplace: Yes

    • Living Area: 2304

    • Water Source: Other

    • Subdivision Name: Off Shore Island

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The multiple listing information is provided by the Miami Association of REALTORS® from a copyrighted compilation of listings. The compilation of listings and each individual listing are ©2026-present Miami Association of REALTORS®. All Rights Reserved. The information provided is for consumers' personal, noncommercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. All properties are subject to prior sale or withdrawal. All information provided is deemed reliable but is not guaranteed accurate, and should be independently verified. Listing courtesy of: Compass Florida, LLC