1 E Sister Rock Island, Marathon, FL 33050
New Listing
$16,000,000
Property Type:
Residential
Bedrooms:
4
Baths:
3
Square Footage:
2,304
Lot Size (sq. ft.):
280,526
Status:
Active
Current Price:
$16,000,000
List Date:
8/12/2026
Last Modified:
8/13/2026
Listing Details MLS# 620952
Location, Tax & Legal
- Street #
- Yes
- Direction
- E
- Street Name
- Sister Rock Island
- Key/Island
- Marathon
- State/Province
- FL
- Zip Code
- 33050
- County
- Monroe
- Subdivision
- Misc Sombrero Area (50.0)
- Area
- 14 - Sombrero Area
- City
- MARATHON
- Mile Marker
- 50
- Marathon Neighborhood
- Sombrero
- Side
- Ocean
- Alternate Key #
- 1124222
- Parcel #
- 00105590000000
- Zoning
- RM-1 - Residential Medium - 1
- Deed Restrictions
- Unknown
- Legal
- 23 66 32 Lot 2 (Us Patent 1186533) East Sister Rock And Adjacent Bay Bottom G71-513(Ii Deed 20369) Or374-139/40 Or752-16
- Taxes
- 25481.52
- Tax Year
- 2025
- Pub Sewer HkUp
- No
Contract Information
- Listing Board
- Marathon/Lower Keys
General Property Description
- Realtor.COM Type
- Residential - Single Family
- Style
- Off Shore Island
- Waterfront
- Yes
- Control Depth
- 3
- Pool
- Yes
- Year Built
- 1980
- Lot SqFt
- 280526
- Lot Sqft Source
- Tax Records
- Acres
- 6.44
- Living Apx SqFt
- 2304
- SqFt Source
- Tax Records
- Total Bedrooms
- 4
- Full Baths
- 3
- Total Baths
- 3
- Rentals Allowed
- Yes
Association Info
- Mandatory Home Owners Asc
- No
- 1st Right of Refusal
- No
- Association Fee $
- 0
License Info
- Transient Rntl Licns
- Yes
More Information
Dockage
- Dock Length
- 100
- Dock
- Wood
Building Style
- Above Flood
- Unknown
- Stories
- 1 Story
Remarks & Misc
- Remarks – Consumer
- Own an entire private island in the heart of the Florida Keys. Located just ¼ mile offshore from Marathon, East Sister Rock Island offers extraordinary privacy surrounded by turquoise waters, yet remains only minutes from the mainland. The property encompasses approximately 6.5 acres, including approximately 5.8 acres of surrounding seabed that create an exceptional marine setting for snorkeling, swimming, kayaking, paddle boarding, fishing and exploring the crystal-clear waters of the Keys. At the center of the island is a beautifully updated 3-bedroom, 2-bath main residence with a detached guest house, offering over 5,000 total SF of living and entertaining space. Recent interior renovations include a beautifully updated kitchen with gorgeous countertops and modern finishes. A 12-foot-wide wraparound veranda captures panoramic water views, Atlantic sunrises and spectacular Florida Keys sunsets. Designed for the ultimate island lifestyle, the property features a waterfront pool and spa, tropical landscaping, multiple outdoor lounging and dining areas, and a 100-foot deep-water dock with ample dockage. World-class fishing, diving, snorkeling, boating and water-sports begin just outside your door. East Sister Rock is equipped for self-sufficient island living with solar and wind power, battery storage, backup generator, desalination system and substantial freshwater cistern capacity. A private helipad provides an additional point of access. Few properties offer this combination of privacy, accessibility, marine surroundings and established island infrastructure. Seller is also open to exploring select Joint Venture opportunities. Note the sale includes 99 E Ocean Drive on the mainland which has a private dock space.
Fee Includes
- None
- Yes
Tax Exemptions
- None
- Yes
Appliances
- Dishwasher
- Yes
- Dryer
- Yes
- Microwave
- Yes
- Oven
- Yes
- Range
- Yes
- Refrigerator
- Yes
- Stainless Steel Appliance(s)
- Yes
- Washer
- Yes
Pets
- Pets Allowed
- Yes
Cooling
- Central Air
- Yes
Heating
- Central
- Yes
Waterfront
- Oceanfront
- Yes
Waterview
- Ocean View
- Yes
- Open Water View
- Yes
Floor
- Tile
- Yes
- Wood
- Yes
Interior Features
- Bar
- Yes
- Built-in Cabinets
- Yes
- Granite Counter Top
- Yes
- Walk-in Closet(s)
- Yes
Windows/Doors
- Impact Rstnce Window
- Yes
Security
- Other
- Yes
Construction
- CBS
- Yes
- Concrete
- Yes
Land Size
- 5 Less Than 10 Acres
- Yes
Terms
- Cash
- Yes
- Conventional
- Yes
- Seller Finance Psble
- Yes
- Other Specify
- Yes
Utilities
- Satellite Dish
- Yes
- Septic Tank
- Yes
- Solar Power
- Yes
- Whole House Generatr
- Yes
Porch/Balcony
- Deck
- Yes
- Open Porch/Balcony
- Yes
Exterior Features
- Detached Guest Qtrs
- Yes
Pool Info
- In Ground
- Yes
- Decked
- Yes
Roof
- Metal Roof
- Yes
Shutters
- Accordion
- Yes
Property Features
Fee Includes:
None
Tax Exemptions:
None
Waterfront:
Oceanfront
Waterview:
Ocean View; Open Water View
Cooling:
Central Air
Heating:
Central
Utilities:
Satellite Dish; Septic Tank; Solar Power; Whole House Generatr
Interior Features:
Bar; Built-in Cabinets; Granite Counter Top; Walk-in Closet(s)
Appliances:
Dishwasher; Dryer; Microwave; Oven; Range; Refrigerator; Stainless Steel Appliance(s); Washer
Exterior Features:
Detached Guest Qtrs
Pool Info:
In Ground; Decked
Construction:
CBS; Concrete
Shutters:
Accordion
Floor:
Tile; Wood
Roof:
Metal Roof
Pets:
Pets Allowed
Security:
Other
Land Size:
5 Less Than 10 Acres
Terms:
Cash; Conventional; Seller Finance Psble; Other Specify
Room Information
| Room Name | Level |
|---|---|
| Bedroom 1 | Main |
| Bedroom 2 | Main |
| Bedroom 3 | Main |
| Full Bathroom | Main |
| Full Bathroom | Main |
Listing Office:
Compass Florida, LLC
Last Updated: August - 13 - 2026
The data relating to real estate for sale on this web site comes in part from the Florida Keys MLS, Inc. Information provided is deemed reliable but not guaranteed. All properties are subject to prior sale, change or withdrawal. The information being provided is for consumers’ personal, non-commeral use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. IDX data is deemed reliable but is not guaranteed accurate by the MLS.