Waterfront Half Duplex with
391 10th Street Key Colony Beach, FL 33051
391 10th Street, Key Colony Beach, FL, 33051
$1,225,000
For Sale
$1,225,000
SINGLE_FAMILY - Key Colony, FL
Property Size2,166 SF
Lot Size0.09 Acres
Price / SF$565.56
Days on Market109
Property Features for 391 10th Street
General Information
- Property type
- Residential
- Property subtype
- Duplex
- Zoning
- R-2A - Key Colony Two Fam
- Bedrooms
- 3
- Bathrooms
- 3
- Rooms
- Bedroom 1, Bathroom 1, Bedroom 2, Bedroom 3, Bathroom 2, Bathroom 3
- Parking features
- Open
- Patio and Porch features
- Porch, Deck
- Pets allowed
- Yes
- Interior features
- Storage, Quartz Countertops
- Exterior features
- Fencing
- Fencing
- Fenced
- Appliances
- Washer, Dryer, Dishwasher, Refrigerator, Oven, Microwave, Disposal, Stainless Steel Appliance(s)
- Standard status
- Active
- APN
- 00076300000000
- Size
- 2,166 SF
- Lot size
- 0.09 Acres
Taxes and HOA fees
- Tax Year
- 2025
- Tax Description
- BK 11 NLY 1/2 LT 14 KEY COLONY BEACH FIRST ADDN AMENDED PLAT PB4-11 SHELTER KEY
- Tax Annual Amount
- 6525
Utilities
- Utilities
- Cable Available
- Cooling system
- Central Air
- Water front
- 1
Building Details
- Year built
- 1988
- Flooring type
- Laminate, Tile
- Building materials
- CBS
- Roof type
- Metal
- Additional Structures
- Storage
Listing Agency
Ocean Sotheby's International
(305) 735-4447
12420 Overseas Highway, Marathon, FL
Listed by
Ally Kelley · License #SL3352184
(727) 459-0493
Added: Apr 2 Checked: Jul 19 at 8:06 am
MLS# 619329
Listing URL
Copyright © 2026 Marathon and Lower Keys Association of Realtors. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.
Investment Insights
Based on property information with market context.
This concrete-constructed half duplex offers a waterfront layout with three bedrooms and three bathrooms across two levels. The home includes a downstairs one-bedroom, one-bath suite with additional living area, connected to the upper level by an interior staircase. Sliding glass doors lead to a spacious wood deck, and the property provides 37.5 feet of dockage.
Additional features include a brighter, open concept upper living area with kitchen, dining, and living space. The primary suite includes a recently renovated bathroom with a step-in tiled shower, quartz-topped double vanity, and tiled flooring. A second guest bedroom upstairs also has its own ensuite.
Recent updates listed include a newer AC, a 2018 standing seam metal roof, and termite tenting with a transferable warranty. The property is located in Key Colony Beach, within an R-2A zoning designation for a two-family use.
Additional features include a brighter, open concept upper living area with kitchen, dining, and living space. The primary suite includes a recently renovated bathroom with a step-in tiled shower, quartz-topped double vanity, and tiled flooring. A second guest bedroom upstairs also has its own ensuite.
Recent updates listed include a newer AC, a 2018 standing seam metal roof, and termite tenting with a transferable warranty. The property is located in Key Colony Beach, within an R-2A zoning designation for a two-family use.
Key Highlights
- Concrete half‑duplex built in 1988 with over 2,100 SF and 3 bedrooms, 3 bathrooms
- 37.5 ft of dockage with a wood deck and sliding glass doors to outdoor living
- Interior staircase connects above‑flood first floor to the main living area
Local Financial Insights For Multifamily LT 5
Simulate Cap Rate and NOI
NOI Build-Up
- Vacancy
- income lost from leasable area expected to sit empty during the year — subtracted from gross rent.
- EGI (Effective Gross Income)
- gross rent minus vacancy losses — the realistic income before paying operating costs.
- OpEx (Operating Expenses)
- recurring costs to operate the property (property tax, insurance, utilities, maintenance, management) — excludes financing and capital improvements.
- NOI (Net Operating Income)
- income a property generates after operating costs but before financing and taxes.
| Component | $ | $/SF |
|---|---|---|
| Gross rent | $55.4k | $25.56 |
| − Vacancy | −$3.5k | −$1.63 |
| EGI | $51.8k | $23.93 |
| − OpEx | −$15.6k | −$7.18 |
| NOI | $36.3k | $16.75 |
2,166 SF · lease $25.56/SF/yr · vacancy 6.37% · expense 30.00%
Alternative Uses
Best Use
Multifamily LT 5
$518.4K
$453.6K – $604.8K
NOI $36,285 @ 7.0% cap · market cap 2.96%
Second Best
Apartment 5plus
$480.2K
$420.1K – $560.2K
NOI $33,611 @ 7.0% cap · market cap 2.74%
Theoretical Best
Office A
$871.3K
$762.4K – $1.02M
NOI $60,988 @ 7.0% cap · market cap 4.98%
Zoning and permitted uses should be independently verified with local authorities.
Property Analytics
Property Profile
Location Intelligence
Current Use by Public Records
Duplexes
Similar For Sale Nearby
FAQs
What type of property is this?
Duplex - Concrete-built half duplex includes three bedrooms, three bathrooms, wood deck, and 37.5 feet of dockage.
Where is this duplex located?
The property is located at 391 10th Street Key Colony Beach, FL.
What is the asking price?
The asking price for this property is $1,225,000.
What are key features of this property?
This property features: Concrete half‑duplex built in 1988 with over 2,100 SF and 3 bedrooms, 3 bathrooms; 37.5 ft of dockage with a wood deck and sliding glass doors to outdoor living; Interior staircase connects above‑flood first floor to the main living area
