Key Colony Beach Legal DUPLEX. Being Sold in AS IS condition! NEW METAL ROOF IS PLACE. INVESTMENT OPPORTUNITY IN FABULOUS KEY COLONY BEACH, MARATHON. Multi-Unit/Duplex located offers many great features and is in close proximity to marinas, shopping, restaurants, schools, etc. Each side has 2 bedrooms & 2 full baths, full kitchen, open floor plan. Great yard, fenced, with grass, carport for each side, & separate stairs & parking for each side. Great Price! Just a few yards from the Beach! Two electric and water meters. Call Today!
Multi-familyProperty Type
1988Year Built
6,600 sq ftLot Size
$634Est. Price/Sq.Ft.
2 spacesParking
Listed by Robert Valenzuela, PA• Century 21 Circle
Claim this home to receive a free report every month with insights on the changing estimate.
Market trends in 33051, FL
Last updated September 2026
Buyer's Market
Seller's Market
Buyer's market
Sale-to-List Price
96.5%
+0.1% MoM
Median sale price
$497K
$38K MoM
Avg. days on market
256d
173 days MoM
Recently sold homes
2
1 MoM
Provided by Redfin
Sale history for 280 - 290 3rd St
Date
Event
Price
FLKMLS #574054
May 31, 2018
Sold
$435,000
$283/sq ft
Feb 1, 2017
Listed
$450,000
$293/sq ft
As the MLS and public records start to fill up, we'll list the details here.
Public record
Beds
—
Baths
—
Stories
—
Lot width
—
Lot depth
—
Lot size
—
Year renovated
—
Sq. Ft.
—
Year built
—
Style
Multi-Family (2-4 Unit)
County
Monroe County
APN
00072600-000000
Parking Spaces
—
Basement
—
Accessible
—
HOA Dues
—
Garage
—
Features
—
Last updated by owner on Oct 1, 2026.
Property details
Parking
Parking / Garage Information
Vehicle Storage: Carport, Covered Parking
Vehicle Storage: Car(s): 2
Interior
Interior Features
Flooring: Tile Floor
Cooling/Heating: Central A/C, Ceiling Fans
Appliances: Dishwasher, Oven, Range, Refrigerator
Furnished: Unfurnished
Bathroom Information
# of Full Baths: 4
Multi-Unit Information
# of Total Units: 2
Exterior
Boat Slip/Dock Information
Dockage: Other Dockage, None
Exterior Features
Porch/Balcony: Open Porch/Balcony, Patio
Property Features
Waterfront Type: None
Waterview: No Waterview
Property Information
Deed Restrictions: Unknown
Pets: Pets w/Restrictions: unknown
Rentals Allowed: With Restrictions
Min Rental Days: 7
Lot Information
Acres: 0.15
Zoning: R-3 - Multi Unit Res
Land Size: Less Than 1/4 Acre
Flood Zone: AE
Building Information
Year Built: 1,988
Sq. Ft. Source: Property Data Card
Building Style: Above Flood: No
Construction: CBS, Combo Construction, Frame
Roof: Shingle Roof
Subdivision/Neighborhood
Subdivision: Key Colony Beach (53.5)
Financial
Tax Information
Taxes: $3,596.24
Tax Year: 2,016
Tax Exemptions: None
Utilities
Utility Information
Utilities: FKAA, Elect Separate Meter, Water Separate Meter, Municipal Sewer
Has Public Sewer Hook-up
Location
Homeowners Association Information
Association Info: 1st Right of Refusal: No
Fee Includes: None
Location Information
Side: Ocean
Mile Marker: 53.50
Directions: Overseas Hwy (US 1) traffic light at Sadowski Causeway which is Key Colony Beach Entrance drive towards the Ocean make a left at end of road Make a left at 3rd Street, property will be on your right.
Public facts
Beds: —
Baths: —
Sq. Ft.: —
Stories: —
Lot Size: —
Style: Multi-Family (2-4 Unit)
Year Built: —
Year Renovated: —
County: Monroe County
APN: 00072600-000000
Home facts updated by county records on Oct 1, 2026
Around this home
Schools
Stanley Switlik Elementary School
Public PreK-5 • Assigned • 5.1mi
5/10
Marathon School
Public 6-12 • Assigned • 4.2mi
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, 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
This home receives average direct sun exposure in Key Colony. There appears to be minimal shading by surrounding buildings, terrain, and vegetation.
8.9 hrs
6.4 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$926,000 – $1.12M
Sell confidently with a local market expert in Key Colony. 3 minutes to get started.