$16,000,000
Marathon, FL 33050
MLS# A12037474
4 beds | 3 baths
1 / 21
Property Description
PRIVATE ISLAND INVESTMENT OPPORTUNITY IN THE FLORIDA KEYS! East Sister Rock is a rare, income-producing private island located just ¼ mile offshore from Marathon. Successfully operating as a luxury vacation rental and event venue for over 20 years, this one-of-a-kind property offers an exceptional blend of lifestyle, hospitality, and investment potential. Open to partnership and fractional ownership opportunities. A short boat ride across crystal-clear waters brings you to a self-sustaining tropical retreat featuring a 3BR/2BA main residence, detached guest house, a 100-foot deep-water dock capable of accommodating multiple vessels, helipad, wind and solar power, whole-house generator, and freshwater cistern. Guests enjoy world-class snorkeling, fishing, diving, kitesurfing, and watersports directly from the property. Wake to unobstructed Atlantic sunrises from the wraparound veranda and end each day with spectacular Florida Keys sunsets. Whether seeking a private family compound, luxury rental asset, event destination, or unique investment opportunity, East Sister Rock delivers an unparalleled ownership experience. Visit Floridaisland.com for details.
Details
Maps
Contract Information
Comp Sale YN: No
Occupant Type: Call Listing Agent
Listing Date: 2026-06-15
Status: Active
Original List Price: 16000000
List Price: $16,000,000
Current Price: $16,000,000
Location and Legal
County Or Parish: Monroe
County Parish Name: Monroe
City Name: Marathon
Postal Zip: 33050
Geographic Area: Other
Flood Zone: VE
Country: United States
Street Number: 99
Street Direction Prefix: E
Street Name: Ocean
Street Direction Suffix: E
State Or Province: FL
Postal Code: 33050
Postal Code +4: 2551
Subdivision Name: Ocean E
Area: 5940 - Other Florida County
Elementary School: Stanley Switlik
Middle Or Junior School: Marathon
High School: Coral Shores
Parcel Number: 00104670000401
Zoning: is
General Property Information
Adjusted Area Main: 5184
Living Area Main: 2304
Lot Size Dimensions: 1.25
Lot Size Area: 1334
Water Frontage Feet: 500
Senior Community YN: No
Outdoor Living Spaces YN: Yes
Furnished: Furnished
Stories Total: 1
Fireplace YN: Yes
Pool Private YN: Yes
Spa YN: Yes
Guest House YN: Yes
Property Sub Type: Single Family Residence
Bedrooms Total: 4
Bathrooms Total: 3
Bathrooms Full: 3
Year Built: 1980
Carport YN: 1
Carport Spaces: 4
Covered Spaces: 4
Lot Size Acres: 0.03
Waterfront YN: 1
Direction Faces: North
Financial Information
Estimated Monthly Assoc Recurring Fee: 42
Membership Fee Required YN: No
Association Fee: 500
Association Fee Frequency: Annually
Tax Annual Amount: 16899
Tax Year: 2025
Tax Legal Description: 14 66 32 BOOT KEY (AKA UNRECORDED OCEAN EAST INC REV SURVEY 4-14-75 PT LOT 1) OR555-203 OR589-894 OR772-1173 OR983-1569 OR1364-739 OR1547-23
Office/Member Information
DXORIGMLSID: SEF
Amenities
Street Lights: 1
Association Amenities
Gated: 1
Dining Area
Eat-In Kitchen: 1
Family/Dining Combination: 1
Florida/Dining Combination: 1
Kitchen Dining: 1
Snack Bar/Counter: 1
Electric
Circuit Breakers: 1
Entry Information
Entry Level: 1
Exterior Features
Barbecue: 1
Outdoor Shower: 1
Flooring
Vinyl: 1
Guest House Area Details
Living Area Guest House: 600
Guest House Features
1 Bath: 1
1 Bedrooms: 1
Kitchen: 1
Living Room: 1
Parking Features
Driveway: 1
Property Condition
Updated/Remodeled: 1
Spa Features
Fiberglass: 1
Other Structures
Outbuilding: 1
Possession
Close Of Escrow: 1
Negotiable: 1
Sewer
Septic Tank: 1
Special Information
Sold As-Is: 1
Utilities
Cable Not Available: 1
View
Water: 1
Heating
Central: 1
Window/Wall: 1
Water Access
No Fixed Bridge: 1
Water View
Direct Ocean: 1
Ocean: 1
Appliances
Dishwasher: 1
Dryer: 1
Gas Range: 1
Ice Maker: 1
Microwave: 1
Refrigerator: 1
Solar Hot Water: 1
Washer: 1
Water Purifier: 1
Construction Materials
CBS: 1
Green Energy Efficient
Appliances: 1
Construction: 1
Doors: 1
HVAC: 1
Water Heater: 1
Interior Features
Bar: 1
Closet Cabinetry: 1
High Ceilings: 1
Pantry: 1
Levels
One: 1
Listing Terms
Cash: 1
Conventional: 1
Cryptocurrency: 1
Owner Will Carry: 1
Other Equipment
Fuel Tank(s): 1
Satellite Dish: 1
Pool Features
Fiberglass: 1
In Ground: 1
Road Frontage Type
Private Road: 1
Road Surface Type
Paved: 1
Roof
Aluminum: 1
Security Features
Fire Alarm: 1
Smoke Detector(s): 1
Water Source
Other: 1
Waterfront Features
Ocean Front: 1
Water Heater Details
Electric Water Heater: 1
Gas Water Heater: 1
Boat and Dock Information
Dock: Yes
Boat and Dock Features
Deeded Dock: 1
Private Dock: 1
Cooling
Central Air: 1
Wall/Window Unit(s): 1
Association Type
Homeowner Association: 1
Showing Requirements
Appointment Only: 1
Master Bedroom/Bath
Bedroom On Entry Level: 1
Dual Sinks: 1
Separate Shower: 1
Pets Allowed YN
Yes: 1
Pool Size Details
Pool Size (WxL): 10x42
Restrictions
See Remarks: 1
Storm Protection
Accordian Shutters: Complete
Impact Glass: Complete
Permanent Generator: Whole House
Tax Information
City/County: 1
Other Exemption: 1
Outdoor Living Spaces
Deck: 1
Porch: 1
Porch Details
Porch - Wrap Around: 1
Price Calculations
Current Price To SqFt: 6944.44
Section Details
Parcel Number MLX: 5590
Acreage Description
1 To Less Than 2 Acre Lot: 1
Status Change Information
Major Change Timestamp: 2026-07-24T05:15:22Z
Major Change Type: Back on Market
Status Change Date: 2026-07-24
Originating Details
Originating System Key: 513832185
Originating System ID: M00000151
Property Features
Association Amenities: Gated
Dining Area: Eat-In Kitchen; Family/Dining Combination; Florida/Dining Combination; Kitchen Dining; Snack Bar/Counter
Electric: Circuit Breakers
Exterior Features: Barbecue; Outdoor Shower
Flooring: Vinyl
Guest House Features: 1 Bath; 1 Bedrooms; Kitchen; Living Room
Parking Features: Driveway
Property Condition: Updated/Remodeled
Spa Features: Fiberglass
Appliances: Dishwasher; Dryer; Gas Range; Ice Maker; Microwave; Refrigerator; Solar Hot Water; Washer; Water Purifier
Water Heater Details: Electric Water Heater; Gas Water Heater
Boat and Dock Features: Deeded Dock; Private Dock
Construction Materials: CBS
Cooling: Central Air; Wall/Window Unit(s)
Association Type: Homeowner Association
Green Energy Efficient: Appliances; Construction; Doors; HVAC; Water Heater
Heating: Central; Window/Wall
Interior Features: Bar; Closet Cabinetry; High Ceilings; Pantry
Levels: One
Listing Terms: Cash; Conventional; Cryptocurrency; Owner Will Carry
Other Equipment: Fuel Tank(s); Satellite Dish
Other Structures: Outbuilding
Pets Allowed YN: Yes
Pool Features: Fiberglass; In Ground
Possession: Close Of Escrow; Negotiable
Restrictions: See Remarks
Road Frontage Type: Private Road
Road Surface Type: Paved
Roof: Aluminum
Security Features: Fire Alarm; Smoke Detector(s)
Sewer: Septic Tank
Special Information: Sold As-Is
Tax Information: City/County; Other Exemption
Utilities: Cable Not Available
View: Water
Water Access: No Fixed Bridge
Water Source: Other
Water View: Direct Ocean; Ocean
Waterfront Features: Ocean Front
Showing Requirements: Appointment Only
Outdoor Living Spaces: Deck; Porch
Porch Details: Porch - Wrap Around
Acreage Description: 1 To Less Than 2 Acre Lot
Listing Office: Frank Taylor Real Estate Inc
Last Updated: July - 24 - 2026
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