99 E Ocean E, Marathon, FL 33050

New Listing

$16,000,000

Virtual Tour

https://www.propertypanorama.com/instaview/mia/A12037474

Property Type: Residential Bedrooms: 4 Baths: 3 Square Footage: 2,304 Status: Active

Current Price: $16,000,000 List Date: 6/15/2026 Last Modified: 6/18/2026

Overview

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, lux ... (Read more)

Listing Details MLS# A12037474

General Property Information

Property Sub Type: Single Family Residence
Bedrooms Total: 4
Bathrooms Total: 3
Bathrooms Full: 3
Living Area Main: 2304
Adjusted Area Main: 5184
Year Built: 1980
Carport YN: Yes
Carport Spaces: 4
Covered Spaces: 4
Lot Size Area: 1334
Lot Size Acres: 0.03
Lot Size Dimensions: 1.25
Senior Community YN: No
Guest House YN: Yes
Waterfront YN: Yes
Water Frontage Feet: 500
Outdoor Living Spaces YN: Yes
Stories Total: Yes
Direction Faces: North
Fireplace YN: Yes
Pool Private YN: Yes
Spa YN: Yes
Furnished: Furnished

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

Contract Information

Comp Sale YN: No
Original List Price: 16000000
Occupant Type: Call Listing Agent

Location and Legal

Country: United States
County Or Parish: Monroe
County Parish Name: Monroe
Street Number: 99
Street Direction Prefix: E
Street Name: Ocean
Street Direction Suffix: E
City Name: Marathon
State Or Province: FL
Postal Code: 33050
Postal Code +4: 2551
Postal Zip: 33050
Subdivision Name: Ocean E
Area: 5940 - Other Florida County
Geographic Area: Other
Elementary School: Stanley Switlik
Middle Or Junior School: Marathon
High School: Coral Shores
Parcel Number: 00104670000401
Zoning: is
Flood Zone: VE

Financial Information

Association Fee: 500
Association Fee Frequency: Annually
Membership Fee Required YN: No
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

Status Change Information

Major Change Timestamp: 2026-06-15T04:00:00Z
Major Change Type: New Listing
Status Change Date: 2026-06-18

More Information

Entry Information

Entry Level: Yes

Guest House Area Details

Living Area Guest House: 600

Boat and Dock Information

Dock: Yes

Pool Size Details

Pool Size (WxL): 10x42

Storm Protection

Accordian Shutters: Complete
Impact Glass: Complete
Permanent Generator: Whole House

Price Calculations

Current Price To SqFt: 6944.44

Section Details

Parcel Number MLX: 5590

Originating Details

Originating System Key: 513832185
Originating System ID: M00000151

Office/Member Information

DXORIGMLSID: SEF

Amenities

Street Lights: Yes

Association Amenities

Gated: Yes

Dining Area

Eat-In Kitchen: Yes
Family/Dining Combination: Yes
Florida/Dining Combination: Yes
Kitchen Dining: Yes
Snack Bar/Counter: Yes

Electric

Circuit Breakers: Yes

Exterior Features

Barbecue: Yes
Outdoor Shower: Yes

Flooring

Vinyl: Yes

Guest House Features

1 Bath: Yes
1 Bedrooms: Yes
Kitchen: Yes
Living Room: Yes

Parking Features

Driveway: Yes

Property Condition

Updated/Remodeled: Yes

Spa Features

Fiberglass: Yes

Other Structures

Outbuilding: Yes

Possession

Close Of Escrow: Yes
Negotiable: Yes

Sewer

Septic Tank: Yes

Special Information

Sold As-Is: Yes

Utilities

Cable Not Available: Yes

View

Water: Yes

Heating

Central: Yes
Window/Wall: Yes

Water Access

No Fixed Bridge: Yes

Water View

Direct Ocean: Yes
Ocean: Yes

Appliances

Dishwasher: Yes
Dryer: Yes
Gas Range: Yes
Ice Maker: Yes
Microwave: Yes
Refrigerator: Yes
Solar Hot Water: Yes
Washer: Yes
Water Purifier: Yes

Construction Materials

CBS: Yes

Green Energy Efficient

Appliances: Yes
Construction: Yes
Doors: Yes
HVAC: Yes
Water Heater: Yes

Interior Features

Bar: Yes
Closet Cabinetry: Yes
High Ceilings: Yes
Pantry: Yes

Levels

One: Yes

Listing Terms

Cash: Yes
Conventional: Yes
Cryptocurrency: Yes
Owner Will Carry: Yes

Other Equipment

Fuel Tank(s): Yes
Satellite Dish: Yes

Pool Features

Fiberglass: Yes
In Ground: Yes

Road Frontage Type

Private Road: Yes

Road Surface Type

Paved: Yes

Roof

Aluminum: Yes

Security Features

Fire Alarm: Yes
Smoke Detector(s): Yes

Water Source

Other: Yes

Waterfront Features

Ocean Front: Yes

Water Heater Details

Electric Water Heater: Yes
Gas Water Heater: Yes

Boat and Dock Features

Deeded Dock: Yes
Private Dock: Yes

Cooling

Central Air: Yes
Wall/Window Unit(s): Yes

Association Type

Homeowner Association: Yes

Showing Requirements

Appointment Only: Yes

Master Bedroom/Bath

Bedroom On Entry Level: Yes
Dual Sinks: Yes
Separate Shower: Yes

Pets Allowed YN

Yes: Yes

Restrictions

See Remarks: Yes

Tax Information

City/County: Yes
Other Exemption: Yes

Outdoor Living Spaces

Deck: Yes
Porch: Yes

Porch Details

Porch - Wrap Around: Yes

Acreage Description

1 To Less Than 2 Acre Lot: Yes

Listing Office: Frank Taylor Real Estate Inc

Last Updated: June - 18 - 2026

This information is not verified for authenticity or accuracy and is not guaranteed and may not reflect all real estate activity in the market. Copyright 2026 Beaches Multiple Listing Service, Inc. All rights reserved. Information Not Guaranteed and Must Be Confirmed by End User. Site contains live data.

99 E Ocean E, Marathon, FL 33050 (MLS# A12037474)