Discover exceptional waterfront living in the heart of Key Colony Beach. This concrete constructed half duplex offers over 2,100 square feet with three bedrooms, three bathrooms inside and 37.5 feet of dockage. A rare and highly desirable interior staircase welcomes you from the above flood first floor, seamlessly connecting both levels of the home. Downstairs is completely built above flood and features a one bedroom, one bathroom suite with additional living area, ideal for guests or extended family. Step through sliding glass doors to a spacious wood deck and 37.5 feet of dockage. Enjoy the ocean breeze and shade under the lush buttonwood tree. Upstairs, enjoy open concept living with a bright and airy kitchen, dining, and living area designed for effortless entertaining. The primary suite boasts a recently renovated bathroom with step-in tiled shower, quartz topped double vanity and tiled flooring. Nearby, a second guest bedroom offers its own ensuite for added comfort and privacy. Recent updates include a newer AC, 2018 standing seam metal roof, and termite tenting with a transferable warranty, providing peace of mind for years to come. With its rare downstairs living, expansive square footage, and thoughtfully designed layout, this property presents a unique opportunity to own a well-cared-for waterfront residence in one of the most desirable areas of the Florida Keys. Key Colony Beach welcomes primary and seasonal guests with the 9-hole par 3 golf course, tennis and pickle ball courts, Sunset Park, City Hall, police department, multiple restaurants, boat ramp and marina. Enjoy the island lifestyle with amenities galore!
Single-familyProperty Type
1988Year Built
4,125 sq ftLot Size
$547Price/Sq.Ft.
Listed by Jo Ann Cook, Broker Associate Cook• Ocean Sotheby's International
Listed by Ally Kelley• Ocean Sotheby's International
Nice and spacious 3 bedroom, 3 bath half duplex, two stories with inside spiral staircase. 2 central a/c systems, great backyard deck and wood dock. Offered furnished and ready to live in or rent.
FLKMLS #502134
Aug 28, 2000
Listing Removed
—
Apr 6, 2000
Listed
$495,000
$229/sq ft
Year
Property tax
Land + Additions
Assessment*
2025
$6,525 (+0.5%)
2024
$6,493 (+3.3%)
2023
$6,288 (+3.9%)
2022
$6,054 (−0.8%)
2021
$6,105 (+4.7%)
$260,906 + $343,994
$604,900
2020
$5,832 (−2.5%)
$247,500 + $308,112
$555,612
2019
$5,981 (+9.4%)
$247,500 + $308,112
$555,612
2018
$5,468 (+1.1%)
$247,500 + $292,159
$539,659
2017
$5,407 (+7.3%)
$247,500 + $299,793
$547,293
2015
$5,040 (+4.2%)
$247,500 + $304,037
$551,537
2014
$4,839
Public record
Public record
Permits
Beds
3
Baths
3
Stories
2
Lot width
—
Lot depth
—
Lot size
4,125 Sq. Ft.
Year renovated
2003
Finished Sq. Ft.
2,166
Unfinished Sq. Ft.
—
Total Sq. Ft.
2,166
Year built
1988
Style
Single Family Residential
County
Monroe County
APN
0566 33 00076300000000
Parking Spaces
—
Basement
—
Accessible
—
HOA Dues
—
Garage
—
Features
—
Last updated by owner on Apr 21, 2026.
Mar 21, 2025 • Final
Building
Remodel
Permit history is from public records and may be incomplete or inaccurate. Redfin and its agents make no representations about the property condition or permit status. Buyers should independently verify all information.
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
1/10 Fire Factor
Unlikely to be in a wildfire in next 30 years
Heat Factor
We're working on getting current and accurate heat risk information for this home.
10/10 Wind Factor
99% chance of strong winds in next 30 years
1/10 Air Factor
0 unhealthy days expected this year, 0 days in 30 years
Provided by First Street
Historical weather
Key Colony Beach, FL • 33051
Average low and high temperatures (°F)
73
64
75
68
79
71
81
75
85
79
87
81
89
82
90
82
87
79
84
78
79
73
77
70
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
93/ 100
Exceptional sunlight
Sunscore
There appears to be minimal shading by surrounding buildings, terrain, and vegetation.
9.3 hrs
6.8 hrs
JuneDecember
Provided by Shadowmap
Redfin Estimate for 391 10th St
$1,176,332
$8,668 under list price of $1.19M
Nearby comparable homes
The Redfin Estimate uses 6 recent nearby sales, priced between $995K to $1.3M.