Welcome to this inviting east facing, waterfront, stilted half duplex in Key Colony Beach, offering three bedrooms, four bathrooms, and nearly 1,600 square feet of interior living space. With 37.5 feet of concrete seawall, step down wooden dock with concrete pilings, heated and chilled pool, and a spacious concrete patio for lounging and entertaining, this property is perfectly designed for the Keys lifestyle. Peace of mind features include metal roof, Hardie board siding, recently upgraded impact windows and doors, and a 2020 AC. A generous carport and driveway provide ample parking, along with a downstairs enclosure that features a full convenience bathroom, air conditioned cabana room, and a one car garage for storage of toys and gear. Saltillo tile flows throughout the first level, where you will find an open concept great room with soaring ceilings that connect the kitchen, dining, and living areas. Enjoy indoor to outdoor living from the large covered second floor patio ideal for al fresco meals, morning coffee, or watching stunning sunrises over the canal. The newly renovated primary bathroom showcases a spacious step-in tiled shower, quartz topped vanity, and elegant gold finishes. A comfortable guest bedroom and bathroom are conveniently located on the same level, with laundry in the hallway closet. Upstairs, the loft offers a third bedroom and full bathroom with plank flooring, creating a private retreat for guests or family. Your Key Colony Beach haven awaits. The City of Key Colony Beach offers its own police department, City Hall, tennis and pickleball courts, dog park, nine hole par three golf course, two playgrounds, and two new restaurants opening soon. Enjoy the walkable island lifestyle and the best of coastal living here!
Single-familyProperty Type
1988Year Built
4,125 sq ftLot Size
$932Est. Price/Sq.Ft.
1 spaceParking
Listed by Karen Raspe• Ocean Sotheby's International
Listed by Ally Kelley• Ocean Sotheby's International
Bought with Nate Bartlett• Berkshire Hathaway HomeServices Keys Real Estate
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Earn from this home
Refinance
$0
Est. cash available
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Rent
$3,345/mo
Redfin rental estimate
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Market trends in Key Colony Beach, FL
Last updated September 2026
Buyer's Market
Seller's Market
Buyer's market
Sale-to-List Price
95.3%
+0.0% MoM
Median sale price
$1.8M
$215K MoM
Avg. days on market
204d
20 days MoM
Recently sold homes
18
3 MoM
Provided by Redfin
Sale history for 640 9th St
Date
Event
Price
Public Records
Mar 4, 2026
Sold
$1,310,000
$821/sq ft
FLKMLS #617620
Mar 4, 2026
Listing Removed
—
Mar 4, 2026
Sold
$1,310,000
$821/sq ft
Jan 23, 2026
Contingent
—
Dec 6, 2025
Listed
$1,400,000
$877/sq ft
FLKMLS #600605
Jun 10, 2022
Sold
$1,352,000
$847/sq ft
Apr 25, 2022
Contingent
—
Apr 15, 2022
Listed
$1,352,000
$847/sq ft
+46
Here is your Pool in Paradise! This east facing, nearly 1600 sq ft, stilted half duplex has everything you need for your retirement home, weekend getaway or vacation rental. Fantastic space for entertaining family and friends! Open great room with soaring cathedral ceilings plus three roomy, en-suite bedrooms. A large covered balcony offers amazing views of the 100 ft wide canal and a comfortable place to relax, dine or just get together. Ground level entertaining features a refreshing pool, 37.5 ft dock, sun deck, covered patio and a cabana studio with full bath. New appliances, washer and dryer and HVAC are some of the many upgrades to this home. Gross annual rentals were $69K with sellers in residence for 4 months in 2021. And all of this is less than 5 minutes to open ocean and gulf, located in Key Colony Beach the ''GEM'' of the Florida Keys.
Public Records
Feb 25, 2020
Sold
$735,000
$461/sq ft
FLKMLS #568932
Jun 17, 2016
Sold
$550,000
$345/sq ft
Nov 11, 2015
Listed
$598,000
$375/sq ft
+18
THIS CANAL FRONT, EAST FACING, HALF DUPLEX IS A MUST SEE. 2 BEDROOM, THREE BATH WELL MAINTAINED HOME WITH A LOFT. VERY SPACIOUS, LOTS OF STORAGE UPSTAIRS AND DOWNSTAIRS. SMALL WORKSHOP IN THE GARAGE AND PLENTY OF ROOM FOR OUTDOOR ENTERTAINING. LOFT WINDOWS ARE IMPACT RESISTANT AS WELL AS SIDE DOOR IS HURRICANE RATED.
FLKMLS #408899
Apr 15, 1999
Sold
$290,000
$182/sq ft
Jan 23, 1998
Listed
$290,000
$182/sq ft
Public Records
Oct 21, 1993
Sold
$200,000
$125/sq ft
Year
Property tax
Land + Additions
Assessment*
2025
$8,762 (−2.3%)
$486,750 + $393,977
$880,727
2024
$8,972 (−1.1%)
$478,500 + $401,492
$879,992
2023
$9,068 (+33.6%)
$474,375 + $413,870
$888,245
2022
$6,788 (+12.4%)
2021
$6,036 (+5.0%)
$260,906 + $295,288
$556,194
2020
$5,747 (+2.1%)
$247,500 + $299,302
$546,802
2019
$5,627 (+14.4%)
$247,500 + $299,302
$546,802
2018
$4,916 (+1.7%)
$247,500 + $232,730
$480,230
2017
$4,832 (+0.8%)
$247,500 + $236,303
$483,803
2015
$4,796 (−5.0%)
$247,500 + $250,066
$497,566
2014
$5,048
Tax history for 640 9th St
Year
Property tax
Land + Additions
Assessment*
2025
$8,762 (−2.3%)
$486,750 + $393,977
$880,727
2024
$8,972 (−1.1%)
$478,500 + $401,492
$879,992
2023
$9,068 (+33.6%)
$474,375 + $413,870
$888,245
2022
$6,788 (+12.4%)
2021
$6,036 (+5.0%)
$260,906 + $295,288
$556,194
2020
$5,747 (+2.1%)
$247,500 + $299,302
$546,802
2019
$5,627 (+14.4%)
$247,500 + $299,302
$546,802
2018
$4,916 (+1.7%)
$247,500 + $232,730
$480,230
2017
$4,832 (+0.8%)
$247,500 + $236,303
$483,803
2015
$4,796 (−5.0%)
$247,500 + $250,066
$497,566
2014
$5,048
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Public record
Public record
Permits
Beds
3
Baths
4
Stories
3
Lot width
—
Lot depth
—
Lot size
4,125 Sq. Ft.
Year renovated
2008
Sq. Ft.
1,596
Year built
1988
Style
Single Family Residential
County
Monroe County
APN
0566 33 00075170000100
Parking Spaces
—
Basement
—
Accessible
—
HOA Dues
—
Garage
—
Features
—
Last updated by owner on Apr 21, 2026.
Nov 21, 2023 • Final
Building
HVAC
Sep 26, 2023 • Final
Building
Electrical
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.
Building Style: Stilt Column Height: Medium - 5Ft - 9Ft
Construction: CBS
Roof: Metal Roof
Subdivision/Neighborhood
Subdivision: Key Colony Beach (53.5)
Marathon Neighborhood: Marathon East - Gulf (Airport to Vaca)
Financial
Tax Information
Taxes: $8,412
Tax Year: 2,025
Tax Exemptions: None
Utilities
Utility Information
Utilities: FKAA, Cable Available, Buyer to Verify, Community Sewer Plant
Pre-Wired: Cable
Has Public Sewer Hook-up
Location
Homeowners Association Information
Association Info: 1st Right of Refusal: No
Association Info: Association Fee $: 0.00
Fee Includes: None
Location Information
Side: Ocean
Mile Marker: 53.50
Directions: From US-1, turn at light onto Sadowski / KCB Causeway. Turn right onto W Ocean Dr. Turn right onto 9th Street & follow to 640 9th toward the end.
Neighborhood Features
Community Boat Ramp, Bike Paths, Airstrip, Beach, Tennis Courts
Public facts
Beds: 3
Baths: 4.0
Sq. Ft.: 1,596
Stories: 3.0
Lot Size: 4,125 square feet
Style: Single Family Residential
Year Built: 1988
Year Renovated: 2008
County: Monroe County
APN: 0566 33 00075170000100
Home facts updated by county records on Apr 21, 2026
Around this home
Schools
Stanley Switlik Elementary School
Public PreK-5 • Assigned • 4.6mi
5/10
Marathon School
Public 6-12 • Assigned • 3.8mi
5/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
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)
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87
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84
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79
73
77
70
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
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Oct
Nov
Dec
Sun exposure
In this area, properties receive around 10 hours in
June and 7.3 hours in December, placing it above the
U.S. average for solar exposure.
10 hrs
7.3 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$1.41M – $1.71M
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