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Gulf Of Mexico Boulevard, 
Marathon, FL 33050

$9,999,999


Bed


Bath


-

Sq Ft


13.20

Acres (Lot)


Land


Virtual Tour

Active

Listed by

Samuel Davis Williams

Brian Schmitt

Coldwell Banker Schmitt Real Estate Co.

305-743-5181

Last updated:

January 7, 2026, 03:34 PM

MLS#

613238

Source:

FL FKBOR

About This Land

Gulf Of Mexico Boulevard

Discover unparalleled privacy and luxury on SeaWatch Island, a breathtaking 13.2-acre private island in the heart of the Florida Keys. This one-of-a-kind property offers a rare opportunity with building entitlement in hand to build a custom 9,500 sq. ft. estate. In addition to the main residence, the property allows for the construction of a stand-alone garage and pool house, offering ample space for vehicles, recreational amenities, and more. Boating enthusiasts, take note! The island is a true boater's paradise, featuring a protected marina with a concrete bulkhead and multiple deep-water slip configurations. Designed for big boat dockage, the marina accommodates Vikings, sportfishers, catamarans, and other large vessels. Whether you're a passionate yachtsman or a fishing aficionado, this property provides a safe, convenient harbor for your fleet. Inquire for more details on this unparalleled dockage opportunity. Fully equipped with a Development Agreement and Building Right, SeaWatch Island simplifies the process of creating your dream sanctuary. The island's concrete bridge ensures easy access while maintaining the ultimate seclusion. The property offers expansive open water views and immediate access to the Atlantic Ocean and Gulf of Mexico, placing world-class fishing, boating, and diving at your fingertips. For additional convenience, MARATHON International Airport is just a short distance away, ensuring seamless connectivity to the rest of the world. This private oasis is more than a propertyit's an exceptional lifestyle. Don't miss the chance to build your legacy on SeaWatch Island, where luxury and tranquility come together like nowhere else.

Land Facts

Description/Design:

Land

Lot Size (Acres)

13.20

MLS #:

613238

Last Updated:

January 7, 2026, 03:34 PM


Finances & Disclosures

Finances

Price:

$9,999,999

Source:FL FKBOR
The information being provided by Florida Keys Board Of REALTORS®, Inc. is for the consumer’s personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. The information is deemed reliable but not guaranteed and should therefore be independently verified. © 2026 Florida Keys Board Of REALTORS®, Inc. All rights reserved.

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Contact an Agent

Yes, I would like more information. Please use and/or share my information with a Coldwell Banker ® affiliated agent to contact me about my real estate needs. By clicking Contact, I request to be contacted by phone or text message and consent to being contacted by automated means. I understand that my consent to receive calls or texts is not a condition of purchasing any property, goods, or services. Alternatively, I understand that I can access real estate services by email or I can contact the agent myself.

If a Coldwell Banker affiliated agent is not available in the area where I need assistance, I agree to be contacted by a real estate agent affiliated with another brand owned or licensed by Anywhere Real Estate (BHGRE®, CENTURY 21®, Corcoran®, ERA®, or Sotheby's International Realty®). I acknowledge that I have read and agree to the terms of use and privacy notice.