1 E Sister Rck Is

Marathon, FL
$ 16,000,000 Beds 4 Baths 3 Sq 2,304 Virtual Tour
Monthly Estimate* How much can I afford?

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.

Active

  • Price
  • $ 16,000,000
  • City
  • Marathon
  • Bedrooms
  • 4
  • Full Bathrooms
  • 3
  • County
  • Monroe
  • Half Bathrooms
  • 0
  • Area
  • 98 Florida Keys
  • Lot Size
  • Zip
  • 33050
  • Sqr Footage
  • 2,304
  • Year Built
  • 2015
  • Taxes
  • $ 25482
  • Style
  • MLS#
  • A12069701
Listed By: This listing is courtesy of Compass Florida, LLC
Data Source: Southeast Florida MLS (SEFMLS)

Features

General

Sewer Septic Tank
Heating Solar
Cooling Central Air
Possession Closing & Funding
Roof Metal
Appliances Built-In Oven,Dryer,Dishwasher,Electric Range,Microwave,Other,Refrigerator,Solar Hot Water,Trash Compactor,Washer
Patio/Porch Features Deck,Open,Porch,Wrap Around
Architectural Style Detached,One Story
Pool Features In Ground,Pool
Restrictions No Restrictions
Construction Materials Block
Year Built 2015
View Ocean
Stories Count 1
Property Subtype Single Family Residence
Tax Year 2025
Waterfront Features Navigable Water,Ocean Access,Ocean Front
Community Features Boat Facilities
County Monroe
Property Type Residential
Subdivision Name Off Shore Island
Facing Direction East
Garage Y/N false
Other Structures Guest House
Full Baths 3
Special Listing Conditions Listed As-Is
Status Active
City Marathon
Senior Community Y/N false
Zoning Description 0S
MLS Area 98 Florida Keys
Lot Size Units Square Feet
Lot Size Square Feet 280628
Carport Y/N false
Listing Terms Cash,Conventional,Other
Year Built Details Effective Year Built
Tax Annual Amount 25482
MLS Area Minor Other Geographic Area (Out Of Area Only)
Lease Considered Y/N false
Standard Status Active
Occupancy Type Call Agent
Property Sub Type Additional Single Family Residence
PostalCity Marathon
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-

Interior Features

Interior Amenities Built-in Features,Bedroom on Main Level,Closet Cabinetry,Eat-in Kitchen,First Floor Entry,Fireplace,Living/Dining Room,Split Bedrooms
Flooring Other,Tile
Air Conditioning Y/N true
Window Features Impact Glass
Fireplace Y/N true
Total Bedrooms 4
Total Baths 3

Exterior Features

Exterior Amenities Deck,Fruit Trees,Security/High Impact Doors,Lighting,Porch,Storm/Security Shutters
Parking Features None
Lot Features 5-10 Acres
Water Source Other
Lot Size Area 280628
Building Area Total 5760
Frontage Length 800
Private Pool true
Waterfront Y/N true
Other Equipment Satellite Dish

Amenities

  • Foreclosure
  • Views
  • Short Sale
  • New Construction
  • Adult 55+
  • Lease To Own
  • No HOA Fees
  • Furnished
  • Primary On Main
  • Air Conditioning
  • Seller Finance
  • Green
  • Fixer Upper
  • Horse
  • Golf
  • Fireplace
  • Deck
  • Garage
  • Basement
  • Pool

Affordability Calculator

$3,786

Per Month

Based on the average sale price from the Miami Beach, FL office

  • Monthly Principal & interest $2,658
  • Monthly Property Taxes $1,062
  • Monthly Home Insurance $67
Adjust Payment Options
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Let's determine your purchasing power. Working with my mortgage partner, you'll have the information you need to shop for a home with confidence.

Default based on a 30-year fixed rate of 6.49% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA, or jumbo loans.

Mortgage calculator provided courtesy of Inside Real Estate.

Schools

Elementary School Unknown Elementary School
Middle School Unknown Middle School
High School Unknown High School

Price History

8/12/2026 Listed $16,000,000

Property vs Zip Code Average in 33050

Price
AVG $3.09M
$16M
Taxes
AVG $12,272
$25,482
Year Built
AVG 1995
2015

Areas That We Cover

1 E Sister Rck Is Marathon, FL is a Single Family Home for sale at $16000000 with 2304 sqft and a lot size of Acre(s). 1 E Sister Rck Is Marathon has 4 bedrooms, 3 baths and was built in 2015. The property's zip code is 33050 which is in Marathon, FL

*Information deemed reliable but not guaranteed.

Financial calculator disclaimer: Default based on a 30-year fixed rate of 6.49% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.

Mortgage calculator provided courtesy of Inside Real Estate.

All information deemed reliable, but not guaranteed, and should be independently verified. The real estate information and related content displayed on this site 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.