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© 2026 DockOnly™. All rights reserved.

DockOnly™ and Dock Score™ are trademarks of Blue Mar Real Estate Group Inc.

Blue Mar Real Estate Group

Blue Mar Real Estate Group Inc.

Licensed Florida Real Estate Broker

DBPR License CQ1018554

Listing data provided by Miami Realtors MLS via Bridge Data Output. Information deemed reliable but not guaranteed. Dock Score™ is a DockOnly.com rating and is not provided by or affiliated with the MLS or listing broker. NOAA chart data is public domain and for reference only — not for navigation. Full MLS Compliance

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+16

99 E Ocean E

Marathon, FL, 33050

Active

$16,000,000

99 E Ocean E

Marathon, FL, 33050

Active

$16,000,000

4

Bedrooms

3

Bathrooms

2,304 sqft

Living Area

1980

Year Built

Mortgage Calculator

Estimate your monthly payment for this waterfront property

20%

$3,200,000 down

%
Principal & Interest$83,021/mo
Property Tax (est. ~1.2%, varies by county)$16,000/mo
Home Insurance (est.)$250/mo
HOA Fees$42/mo
Total Monthly Payment$99,312
Loan Amount: $12,800,000Rate: 6.75%
Get Pre-Qualified

Estimated payments only. Actual rates and terms may vary.

Comparable Sales

$16,000,000Tour the dockSchedule a Showing
Navigation note: Navigation routes show the shortest mapped path to open water. A vessel taller than the binding bridge clearance may still reach open water via a longer alternate route that we don't currently map — verify navigability with a local captain or surveyor before relying on it.

1,334

Lot Size (sqft)

$500

HOA / Annually

3

Days on Market

Dock Score™

DockOnly
87
Excellent

What shaped this score

✓Ocean Front
✓Dock present
✓Bridge-free to bay & ocean
✓Fits boats up to ~72ft (est.)

DockOnly.com rating — not provided by the MLS or listing broker.

Dock & Water AccessMLS

Ocean AccessOcean Front📝 deep water

AI Aerial Imagery Detection

Dock DetectedSeawall DetectedDeep Water Indicators~61-83 ft dock

Detected by AI from open-source aerial mapping imagery and may not reflect current conditions. This information was not provided by the MLS or listing broker. Always verify dock infrastructure with the listing agent.

Navigation RouteDockOnly

Data sources: SFWMD AHED waterway polygons · FHWA National Bridge Inventory 2024 · Not provided by the MLS or listing broker.

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.

Schedule a Showing

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Location

Marathon, FL, 33050

No price history available for this property.

Listing courtesy of Frank Taylor Real Estate Inc

Last updated: 6/19/2026

© 2026 Miami Association of REALTORS®, Inc. All rights reserved. The data relating to real estate for sale on this website comes in part from the Internet Data Exchange program of the Miami Association of REALTORS®. Information is deemed reliable but not guaranteed. All properties are subject to prior sale, change, or withdrawal.

IDX information is provided exclusively for consumers' personal, non-commercial use. It may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.

Dock Score™

DockOnly
87
Excellent

What shaped this score

✓Ocean Front
✓Dock present
✓Bridge-free to bay & ocean
✓Fits boats up to ~72ft (est.)

DockOnly.com rating — not provided by the MLS or listing broker.

Nearest Bridge Clearances

Florida Keys — critical for tall/large vessels

No bridge data available for this location.
FEMA Flood Zone AE
BFE: 9ft

Special Flood Hazard Area

View FEMA Flood Map →
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