WATERFRONT BEAUTIFULLY RENOVATED DUPLEX 330-340, 2BR 2BA Upper Level, 1BR 1.5BA Lower Level, both with Full Kitchens, in Key Colony Beach, a NO HOA Municipality, on Marathon Island MM53. New 15K lbs. Boat Lift 2022, 60 Ft Deep Water Dock, Extra Wide Canal, Multiple Electrical Outlets, 3 Fresh Water Spigots. House is equipped with Surge Protection, and a Transfer Switch for a portable generator. Exterior Motion Lights equipped with Security Cameras. EXCELLENT RENTAL INCOME OPPORTUNITY, 7 Day Rentals allowed. Rent the Upper and Lower units to separate parties at the same time, and or live in one and rent the other unit. Beautiful New Pool Heated-Chilled 2022, with a Saltwater system that uses a salt generator, offering lower maintenance, softer water, and reduced skin-eye irritation. New Pool-Cool Deck concrete patio in 2022, that reduces surface temperatures. Outdoor Shower. Metal Roof 2013. Hurricane Accordion and Metal Bahama Shutters in 2021. Upgraded Electrical system in 2022. Upgraded Flooring, Doors, and Windows. Mini-Split AC unit 2021. Upper Level Covered Balcony, beautiful views of the new Sparkling Pool and Boat Dock-Canal. Ample Storage, 3 large outdoor access rooms, and a shed. Excellent Parking 12 Cars, 2 RVs, and 2 Boats/Trailers storage. Ocean side, minutes to World Class Fishing-Diving in the Gulfstream, Coffins Patch Reef, and Sombrero Reef Lighthouse. Easy Bayside access via Vaca Cut in minutes. Join the Cabana Club, steps away, for beach access and excellent dining. Key Colony Beach amenities includes a Golf Course 9 Hole Par 3, Tennis and Pickle Ball Courts, Basketball, Bocce Ball, Corn Hole, Horseshoes. Enjoy the Parks, Playgrounds, Walking and Bike pathways. Key Colony Beach, Paradise Awaits!
$1,849,000
330-340 4th St, Key Colony Beach, FL 33051
3beds
2,540sqft
Duplex
Built in 1971
-- sqft lot
$1,754,500 Zestimate®
$728/sqft
$-- HOA
What's special
Extra wide canalBoth with full kitchensMultiple electrical outletsOutdoor showerUpper level covered balcony
- 200 days
- 323
- 14
Zillow last checked:
Listing updated:
Listed by:
Dan Cloud 305-396-7844,
Water Vista Realty, Inc.
Source: FLKMLS,MLS#: 619361
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 3
- Bathrooms: 4
- Full bathrooms: 3
- 1/2 bathrooms: 1
Heating
- Has Heating (Unspecified Type)
Cooling
- Central Air, Ceiling Fans(s)
Appliances
- Included: Washer, Dryer, Dishwasher, Refrigerator, Range, Oven, Freezer, Ice Maker
- Laundry: Laundry Room
Features
- Split Bedroom, Built-in Features, Storage
- Flooring: Tile, Laminate
- Windows: Window Coverings
Interior area
- Total structure area: 2,540
- Total interior livable area: 2,540 sqft
Video & virtual tour
Property
Parking
- Parking features: Open, RV Access/Parking, Storage
- Has uncovered spaces: Yes
Features
- Patio & porch: Open Porch/Balcony, Patio
- Exterior features: Lighting, Outdoor Shower, Storage
- Has private pool: Yes
- Pool features: In Ground, Salt Water, Fiberglass, Decked
- Fencing: Fenced
- On waterfront: Yes
Lot
- Size: 6,534 Square Feet
- Dimensions: 60 X 110
Details
- Additional structures: Shed(s)
- Parcel number: 00072990000000
- Zoning: R-2A - Key Colony Two Family
Construction
Type & style
- Home type: MultiFamily
- Property subtype: Duplex
Materials
- Frame, Hardi Board Siding
Condition
- Updated/Remodeled
- New construction: No
- Year built: 1971
Community & HOA
Community
- Features: Community Boat Ramp, Beach, Other, Bike Paths
- Security: Security Guard, On Premises System, Security System
- Subdivision: Key Colony Beach (53.5)
HOA
- Has HOA: No
- Services included: None
Location
- Region: Key Colony Beach
Financial & listing details
- Price per square foot: $728/sqft
- Annual tax amount: $10,604
- Date on market: 4/4/2026
- Listing terms: Cash,Conventional
Estimated market value
$1,754,500
$1.67M - $1.84M
$3,586/mo
Price history
| Date | Event | Price |
|---|---|---|
| 4/18/2026 | Price change | $1,849,000-2.6%$728/sqft |
Source: | ||
| 4/4/2026 | Listed for sale | $1,899,000$748/sqft |
Source: | ||
Public tax history
Tax history is unavailable.
Monthly payment
Est. payment






