Have you been dreaming of your perfect Florida Keys island home & wondering where to build it? Look no further. Build your dream home on one of Marathon's most sought-after streets & waterfront neighborhoods. Tucked away on a quiet dead-end street just moments from Sombrero Beach, this exceptional homesite offers 65 feet of water frontage and the opportunity to create a custom island retreat in the heart of the Florida Keys. Located on desirable Treasure Road, this peaceful enclave is known for its privacy, family-friendly atmosphere, & unbeatable convenience. This is a street you only drive down if you live there, offering a sense of seclusion and tranquility while remaining close to everything Marathon has to offer. Depending on the design and elevation of the future home, buyers may enjoy peek-a-boo ocean views & refreshing breezes from upper-level living areas & balconies. Neighboring homes enjoy water views, showcasing the potential of this unique location. The property is currently in the City of Marathon's BPAS allocation system & ranked #17 in the most recent allocation round w/ 68 points. The seller has a newer set of plans for a 3-bed, 2-bath residence that may be submitted by the next owner, offering a valuable head start in the building process. Alternatively, buyers may choose to submit new plans designed to potentially increase allocation points and improve their ranking. Buyers should verify all BPAS & building requirements & permitting w/ the City of Marathon. You'll love the convenience of being just minutes from Sombrero Beach, restaurants, shopping, & grocery stores in a golf cart friendly neighborhood where daily errands, evening bike rides, & sunset beach walks are all w/ in easy reach. Whether you're planning a primary residence, seasonal getaway, future vacation home, or weekly rental property, this rare waterfront lot offers the opportunity to build exactly what you've been dreaming of while enjoying the very best of the FL Keys.
Vacant landProperty Type
8,870 sq ftLot Size
$68Price/Sq.Ft.
Listed by Monica Barrett• Coldwell Banker Schmitt Real Estate Co.
Directions: From US 1 turn onto Sombrero Beach Road, follow to the beach, turn left on Treasure Rd., go over the bridge — the lot is on the right after the blue house
Home design
Land parcel
Zoned RM (Residential Medium)
Utilities
Underground utilities
Financial info
Annual tax noted
Electricity and solar
View estimated energy costs and solar savings for this home
As the MLS and public records start to fill up, we'll list the details here.
Public record
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Vacant Land
County
Monroe County
APN
00105240-001900
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Last updated by owner on Jun 13, 2026.
Historical weather
Marathon, FL • 33050
Average low and high temperatures (°F)
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Sun exposure
96/ 100
Exceptional sunlight
Sunscore
This home ranks in the top 30% for direct sun exposure in Marathon. There appears to be minimal shading by surrounding buildings, terrain, and vegetation.
10.5 hrs
8.2 hrs
JuneDecember
Provided by Shadowmap
Redfin Estimate for Vacant 3A Treasure Rd
We cannot show automated home-value estimates for this home.
Nearby homes have recently sold between $675,000 and $1,940,000.
Nearby comparable homes
The Redfin Estimate uses 6 recent nearby sales, priced between $675K to $1.9M.