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$11,500,000 Just Listed
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Property Description & Video
57478 Overseas Hwy, Marathon, FLVideo Tour of 57478 Overseas Hwy, Marathon, FL.
Rare oceanfront development opportunity in the heart of the Florida Keys. Encompassing nearly 6 acres of pristine oceanfront land in Grassy Key, this exceptional parcel presents an ideal canvas for developers seeking to create luxury residential units with direct oceanfront and beach access. Surrounded by unspoiled natural beauty and tranquil beaches, the property offers immediate proximity to shopping, fine dining, spas, marinas, and world-class boating. Residents will enjoy unparalleled access to deep-sea fishing, scuba diving, snorkeling, and vibrant coral reefs, all set against the backdrop of the Keys' iconic turquoise waters. Located in Marathon, often referred to as the Heart of the Florida Keys, the site benefits from a highly desirable central Keys location, conveniently positioned between the Upper Keys-such as Islamorada-and the Lower Keys, including Key West. Marathon is known for its rich maritime history, local airport, and accessibility, serving as a central hub comprising islands such as Vaca Key, Duck Key, and Grassy Key. A truly rare offering combining scale, location, and oceanfront presence-an exceptional opportunity to develop a legacy project in one of Florida's most coveted coastal destinations. Please read the broker's remarks for detailed information on this offering.
Full Property Details
Full Property Details for 57478 Overseas Hwy
General
- Price: $11,500,000
- Taxes: $4,222 (2025)
- Status: Active
- Type: Commercial Land
- Source: Greater_Miami
- MLS ID: A11940104
- Updated: 1/16/2026
- Added to Site: 5 day(s) ago
Location
- Area: Crains Subd
- County: Monroe County
- Subdivision: CRAINS SUBD
- Building Name: CRAINS SUBD
Community
- Community Name: Crains Subd
Utilities
- Sewer: Other
- Water: Municipal Water
- Utility Description: Other Utilities Available, None
Structural Information
- Detached/Attached: Detached
- Current Bldg. Use: Unimproved Multi Family (5+Units), Other Style
Lot Features
- Lot Size (Acres): 6
- Lot Size (Sq. Ft.): 103,025
- Lot Dimensions: 360 x 465
- Frontage Feet: 360
- Lot Features: Beach Area, 2.5-5 Acres
- Potential Use: Other Plan Use
- Zoning: SC
Water Features
- Water Front: Yes
- Water Front Desc.: Ocean Access, Ocean Front
Financial Considerations
- Tax Amount: $4,222
- Tax Year: 2025
- Terms: All Cash, Conventional
Disclosures and Reports
- Legal Description: BK 58 LT 10 CRAINS SUBD PB1-51 OF GRASSY KEY OR135-95-96 OR140-29-30 OR407-765-768 OR474-436-438 OR683-887 OR685-713 OR908-1005 OR1572-584 O
- Inclusions: Deeded Beach Access, Other
- Property ID: 00374650-000000
- Lot Number: 103025
Listed by Compass Florida, LLC
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Schools
Schools serving 57478 Overseas Hwy
School District:Monroe County School District, Middle Torch Key, FL
| Name | Grades | Distance |
|---|---|---|
Stanley Switlik Elementary School 3400 Overseas Highway, Marathon, FL 33050 | PK-5 | 8.7 mi |
Marathon School 350 Sombrero Beach Road, Marathon, FL 33050 | 6-12 | 7.9 mi |
Disclaimer:
School attendance boundaries provided by Pitney Bowes and are for reference only. Contact the school directly to verify enrollment eligibility.
Price & Sales History for 57478 Overseas Hwy
Date
Details
Price
Change
Source
1/12/2026
Listed
$11,500,000
142.11%
MLS
2/24/2006
Sold
$4,750,000
—
Public Record
Disclaimer: Historical sales information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.
Tax History
Tax History for 57478 Overseas Hwy
Year
Property Taxes
Change
Tax Assessment
Change
2024
$6,710
-3%
$736,768
—
2023
$6,923
-30%
$737,261
-2%
2021
$9,864
—
$754,244
—
2022
$9,827
—
$754,244
-9%
2021
$9,864
16%
$825,211
58%
2019
$8,538
12%
$521,518
—
2018
$7,651
3%
$522,349
5%
2017
$7,417
-3%
$496,187
-2%
2016
$7,649
—
$504,197
-1%
2015
$7,679
-2%
$509,687
—
2014
$7,806
-1%
$508,741
—
2013
$7,849
—
$508,741
—
Disclaimer: Historical tax information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.
Estimate the Cost
Estimate the Cost for 57478 Overseas Hwy
57478 Overseas Hwy, Marathon, FL 33050 (MLS# A11940104) is a Commercial Land property with a lot size of 6 acres. 57478 Overseas Hwy is currently listed for $11,500,000 and was received on January 12, 2026. Want to learn more about 57478 Overseas Hwy? Do you have questions about finding other Commercial Land real estate for sale in Marathon? You can browse all Marathon real estate or contact a Coldwell Banker agent to request more information.
