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Key West Legal Duplex
For Sale
$1,250,000

1911 Seidenberg Avenue, Key West, FL 33040

MULTI_FAMILY - Other - Key West, FL

Property Size1,119 SF
Lot Size0.12 Acres
Price / SF$1,117
Days on Market109

Property Features for 1911 Seidenberg Avenue

General Information

Property type Residential Multi Family
Property subtype Other
Zoning SF - Single Family
Bedrooms 2
Bathrooms 2
Full bathrooms 2
Rooms Bedroom 2, Bathroom 2, Bedroom 1, Bathroom 1
Parking features Off Street
Patio and Porch features Deck, Porch, Patio
Interior features Built-in Cabinets
Exterior features Fencing, Fruit Tree(s), Rain Gutters, Privacy Wall/Fence, Shed
Fencing Fenced, Privacy
Appliances Washer, Dryer, Refrigerator, Range, Oven
Subdivision Key West Realty Cos Sub (3.0)
View Water
Standard status Active
APN 00047280000000
Size 1,119 SF
Lot size 0.12 Acres

Taxes and HOA fees

Tax Year 2025
Tax Description Kw Kw Realty Co's First Sub Pb1-43 Lot 4 Sqr 19 Tr 21 Or300-449/50 Or402-1080-1081 Or2928-1201
Tax Annual Amount 7059
Legal Description Kw Kw Realty Co's First Sub Pb1-43 Lot 4 Sqr 19 Tr 21 Or300-449/50 Or402-1080-1081 Or2928-1201

Utilities

Utilities Cable Available
Cooling system Window Unit(s), Wall/Window Unit(s)

Building Details

Year built 1943
Flooring type Wood, Vinyl, Concrete
Building materials Frame
Roof type Metal
Architectural style Other
Listing Agency: Ocean Sotheby's International Realty
Listed By: Everett H Smith · License #670558
Added: Apr 30 Changed: Jul 24 Last Checked: Aug 16 at 12:06PM
MLS# 619758

Copyright © 2026 Key West 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 well-maintained two-story property, configured as a legal duplex, offers an investment opportunity in Key West. The property features two separately metered 1-bedroom, 1-bath units. Set on a 0.12-acre lot, the property is surrounded by mature tropical landscaping, creating a private, shaded setting. Two large screened porches and additional open-air spaces provide indoor-outdoor living, complemented by an outdoor shower. The 1,119 square foot home has been updated and features Mitsubishi mini-split A/C systems in both units, a new hot water heater, new ceiling fans, impact windows upstairs, new gutters, updated appliances, and soft-close cabinetry. Interior finishes include a mix of pine, vinyl, and concrete flooring, along with stainless, Formica, and butcher block countertops. Both units offer full bathrooms with tubs. Additional highlights include two off-street parking spaces and low-maintenance grounds. Located in Midtown East, the property is positioned minutes from Key West attractions. The property is ideal for investors seeking rental potential, business owners looking for employee housing, or owner-occupants wanting to offset costs by renting one unit while living in the other.

Key Highlights

  • Legal duplex with two separately metered 1‑bedroom, 1‑bath units
  • Two‑story frame construction built in 1943 with metal roof
  • Mitsubishi mini‑split A/C systems in both units; window/wall A/C units also listed

Property Analytics

Current Use

Duplexes

Suggested Use

Top Pick (Bike/Boat/Book/etc) Store Auto Repair Shop Cosmetic Store Daycare Center Tattoo & Piercing Shop Catering Service

Score = modeled unmet demand for each use within ~1 mi (higher = bigger opportunity). Zoning and permitted uses should be independently verified with local authorities.

Lease Details

2
Residential units

Location Intelligence

Trade Area within ½ mile

1,586
Businesses Nearby

Demographics for 33040, FL

35,958
Population
19,001
Households
1.9
Avg Household Size
44
Median Age
38%
College-Educated
92%
High-School Grad
17.7 sq mi
ZIP Area
2,032
Density / Sq Mi
$79,038
Median Household Income
$42,458
Median Earnings
$2,079
Median Rent
$766,400
Median Home Value

Market

Vacancy Rate% for Multifamily in South region

8.5% 2022
10.2% 2023
11.4% 2024
11.3% 2025
Rey
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Frequently Asked Questions

What type of property is this?
Duplex - Well-maintained two-story duplex in Key West's Midtown East.
Where is this duplex located?
The property is located at 1911 Seidenberg Avenue Key West, FL.
What is the asking price?
The asking price for this property is $1,250,000.
What are key features of this property?
This property features: Legal duplex with two separately metered 1‑bedroom, 1‑bath units; Two‑story frame construction built in 1943 with metal roof; Mitsubishi mini‑split A/C systems in both units; window/wall A/C units also listed
More about this property
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