1 E Sister Rock Island, Marathon, FL

$16,000,000

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4

Beds

3

Baths

2,304

Square feet

280,526

Land Size

About 1 E Sister Rock Island

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.

Features of 1 E Sister Rock Island

MLS® # 620952
Price $16,000,000
Bedrooms 4
Bathrooms 3.00
Full Baths 3
Square Footage 2,304
Land Size 280,526
Year Built 1980
Type Residential
Sub-Type Off Shore Island
Status Active

Community Information

Address 1 E Sister Rock Island
Area 14 - Sombrero Area
Subdivision Misc Sombrero Area (50.0)
City Marathon
County Monroe
State FL
Zip Code 33050

Amenities

Utilities Septic Tank, Whole House Generatr, Satellite Dish, Solar Power
View Ocean View, Open Water View
Is Waterfront Yes
Waterfront Oceanfront
Has Pool Yes
Pool In Ground, Decked

Interior

Interior Features Built-in Cabinets, Granite Counter Top, Walk-in Closet(s), Bar
Appliances Washer, Dryer, Dishwasher, Refrigerator, Range, Oven, Microwave, Stainless Steel Appliance(s)
Heating Central
Cooling Central Air
Fireplace No
Has Basement No

Exterior

Exterior Features Detached Guest Qtrs
Lot Description 5 Less Than 10 Acres
Windows Impact Rstnce Window
Roof Metal Roof
Construction CBS, Concrete

Additional Information

Date Listed August 12th, 2026
Days on Market 1
Zoning RM-1 - Residential Medium - 1
Short Sale No
RE / Bank Owned No

Listing Details

AgentVladimir Rochebrun
OfficeCompass Florida, LLC

Listing Map

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