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$4,950,000
143 Dorsett Drive
Marathon, FL 33050
MLS# 621424
4 beds  |  3 baths  |  2121 sqft


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Property Description
Introducing - Casa Del Mar Estate - this exceptional new home offers a rare level of privacy, scale, and waterfront living on an expansive 26,000+ square foot lot accessed by a private road. Designed to take full advantage of its spectacular setting, the property enjoys unobstructed ocean views and an effortless connection between the residence and the surrounding water. The main living quarters offer four bedrooms and three bathrooms, complemented by substantial finished storage space on the lower level. Built with quality and longevity in mind, the residence features impact-resistant windows and doors, a durable metal roof, concrete construction, and premium finishes throughout, offering the ideal combination of style, security, and peace of mind for waterfront living in the Florida Keys. Beyond the residence, the grounds have been thoughtfully designed for refined outdoor living and entertaining, with a resort-style pool positioned directly toward the ocean and a beautifully appointed gazebo creating the perfect setting for sunset gatherings and private celebrations. An outdoor kitchen, pool table, and table tennis area further extend the living space outdoors, creating an environment equally suited to relaxed afternoons with family or elegant entertaining with guests. The waterfront experience is equally impressive, with generous dockage and a new 20,000-pound boat lift, providing exceptional convenience for boating. Two substantial outdoor sheds offer additional storage for boat side essentials, tools, fishing equipment, and water toys, while the expansive grounds provide something rarely found in the Keys: meaningful room for future expansion. A generous portion of the property remains available for new owners to reimagine and potentially add a guest house, A rare combination of privacy, expansive oceanfront grounds, unobstructed views, exceptional boating amenities, and future expansion potential, offering the ultimate Florida Keys lifestyle.

Details
Maps
Contract Information
Listing Board: Marathon/Lower Keys
Current Price: $4,950,000
Listing Date: 2026-09-28
List Price: $4,950,000
Location, Tax & Legal
City: MARATHON
Mile Marker: 59
Marathon Neighborhood: Grassy Key
Side: Bay/Gulf
Alternate Key #: 1459526
Parcel #: 00376450000000
Zoning: RM - Residential Medium
Deed Restrictions: Unknown
Legal: Lot 14 And Reserved Parcel / Amended Plat Of Dorsett Subd Pb2-153 Grassy Key Pt Of Gov Lot 1 Sec 19 Twp-65S Rge-34E Or75
Taxes: 21084.91
Tax Year: 2025
Pub Sewer HkUp: Yes
Street #: 143
Street Name: Dorsett
Street Suffix: Drive
Key/Island: Marathon
State/Province: FL
Zip Code: 33050
County: Monroe
Subdivision: Dorsett Sub (59.0)
Area: 19 - Crawl Key & Grassy Key
General Property Description
Realtor.COM Type: Residential - Single Family
Waterfront: Yes
Control Depth: 5
Lot Size: X
Lot SqFt: 26498.56
Pool: Yes
Lot Sqft Source: Survey
Acres: 0.66
SqFt Source: Property Data Card
Rentals Allowed: Yes
Min Rental Days: 7
Style: Single Family
Year Built: 2024
Living Apx SqFt: 2121
Total Bedrooms: 4
Full Baths: 3
Total Baths: 3
Remarks & Misc
Remarks – Consumer: Introducing - Casa Del Mar Estate - this exceptional new home offers a rare level of privacy, scale, and waterfront living on an expansive 26,000+ square foot lot accessed by a private road. Designed to take full advantage of its spectacular setting, the property enjoys unobstructed ocean views and an effortless connection between the residence and the surrounding water. The main living quarters offer four bedrooms and three bathrooms, complemented by substantial finished storage space on the lower level. Built with quality and longevity in mind, the residence features impact-resistant windows and doors, a durable metal roof, concrete construction, and premium finishes throughout, offering the ideal combination of style, security, and peace of mind for waterfront living in the Florida Keys. Beyond the residence, the grounds have been thoughtfully designed for refined outdoor living and entertaining, with a resort-style pool positioned directly toward the ocean and a beautifully appointed gazebo creating the perfect setting for sunset gatherings and private celebrations. An outdoor kitchen, pool table, and table tennis area further extend the living space outdoors, creating an environment equally suited to relaxed afternoons with family or elegant entertaining with guests. The waterfront experience is equally impressive, with generous dockage and a new 20,000-pound boat lift, providing exceptional convenience for boating. Two substantial outdoor sheds offer additional storage for boat side essentials, tools, fishing equipment, and water toys, while the expansive grounds provide something rarely found in the Keys: meaningful room for future expansion. A generous portion of the property remains available for new owners to reimagine and potentially add a guest house, A rare combination of privacy, expansive oceanfront grounds, unobstructed views, exceptional boating amenities, and future expansion potential, offering the ultimate Florida Keys lifestyle.
Directions: Take US-1 to Dorsett Drive, turn North onto Dorsett, house at the very end on the right.
Association Info
Mandatory Home Owners Asc: No
1st Right of Refusal: No
Association Fee $: 0
Fee Includes
None: 1
Dockage
Boat Lift: 1
Tax Exemptions
None: 1
Appliances
Dishwasher: 1
Dryer: 1
Freezer: 1
Ice Machine: 1
Microwave: 1
Oven: 1
Range: 1
Refrigerator: 1
Stainless Steel Appliance(s): 1
Washer: 1
Pets
Pets Allowed: 1
Cooling
Ceiling Fans(s): 1
Central Air: 1
Waterfront
Bay Front: 1
Gulf Front: 1
Open Water: 1
Waterview
Bay/Gulf View: 1
Open Water View: 1
Floor
Tile: 1
Interior Features
Built-in Cabinets: 1
Quartz Countertops: 1
Walk-in Closet(s): 1
Property Condition
New Construction: 1
Specialty Rooms
Laundry Room: 1
Building Style
Above Flood: Yes
Windows/Doors
French Doors: 1
Impact Rstnce Doors: 1
Impact Rstnce Window: 1
Vehicle Storage
Car(s): 4+
Covered Parking: 1
Open Parking: 1
RV Parking Open: 1
Trailer Storage: 1
Security
Patrolled Area: 1
Construction
CBS: 1
Land Size
1/2 - Less Than 1 AC: 1
Furnished
Negotiable: 1
Terms
Cash: 1
Conventional: 1
VA: 1
Utilities
FKAA: 1
Municipal Sewer: 1
Porch/Balcony
Open Porch/Balcony: 1
Screened Patio: 1
Exterior Features
Fencing: 1
Gazebo: 1
Outdoor Kitchen: 1
Shed: 1
Storage: 1
Pool Info
In Ground: 1
Concrete: 1
Roof
Metal Roof: 1
Status Change Info
Status: Active
Property Features
Fee Includes: None
Tax Exemptions: None
Waterfront: Bay Front; Gulf Front; Open Water
Waterview: Bay/Gulf View; Open Water View
Dockage: Boat Lift
Property Condition: New Construction
Vehicle Storage: Covered Parking; Open Parking; RV Parking Open; Trailer Storage
Furnished: Negotiable
Cooling: Ceiling Fans(s); Central Air
Utilities: FKAA; Municipal Sewer
Interior Features: Built-in Cabinets; Quartz Countertops; Walk-in Closet(s)
Specialty Rooms: Laundry Room
Appliances: Dishwasher; Dryer; Freezer; Ice Machine; Microwave; Oven; Range; Refrigerator; Stainless Steel Appliance(s); Washer
Exterior Features: Fencing; Gazebo; Outdoor Kitchen; Shed; Storage
Pool Info: In Ground; Concrete
Construction: CBS
Floor: Tile
Roof: Metal Roof
Pets: Pets Allowed
Security: Patrolled Area
Land Size: 1/2 - Less Than 1 AC
Terms: Cash; Conventional; VA

Listing Office: Engel & Völkers Marathon

Last Updated: September - 28 - 2026

The data relating to real estate for sale on this web site comes in part from the Florida Keys MLS, Inc. Information provided is deemed reliable but not guaranteed. All properties are subject to prior sale, change or withdrawal. The information being provided is for consumers’ personal, non-commeral use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. IDX data is deemed reliable but is not guaranteed accurate by the MLS.