646 William Street, Key West, FL 33040 (MLS# 621406)

646 William Street, Key West, FL 33040

$1,400,000
Property Type: Residential Bedrooms: 3 Baths: 2 Square Footage: 1,780 Lot Size (sq. ft.): 4,116 Status: Active
Current Price: $1,400,000 List Date: 9/25/2026 Last Modified: 9/26/2026

Overview

Description

644 William Street The property being sold is 644 William Street. The current property record/card reflects both 644 and 646 William Street, although the property being conveyed is 644 William Street. The structure at 644 William Street is a two-and-a-half-story home currently configured as a duplex and is in need of renovation. The first floor consists of two bedrooms and two bathrooms. The second floor contains two bedrooms and one bathroom. A stairwell provides access to the third floor, which is currently unfinished and is not completed or configured as living space. In its current condition, the property contains four bedrooms and three bathrooms of finished living area, with additional unfinished space on the third floor. The property is currently being used/configured as a duplex and will require renovation.

Listing Details MLS# 621406

Location, Tax & Legal

Street #
646
Street Name
William
Street Suffix
Street
Key/Island
Key West
State/Province
FL
Zip Code
33040
County
Monroe
Subdivision
Old Town - Unlisted (1.0)
Area
02 - Key West

Contract Information

Listing Board
Key West Association
Potential Short Sale
No
Bank Owned
No

General Property Description

Realtor.COM Type
Multi-family
Style
Duplex
Waterfront
No
Pool
No
Year Built
1928
Lot SqFt
4116
Acres
0.09
Living Apx SqFt
1780
SqFt Source
Property Data Card
Total Bedrooms
3
Full Baths
2
Total Baths
2
Rentals Allowed
Yes
Min Rental Days
30

Association Info

Mandatory Home Owners Asc
No
1st Right of Refusal
No

Building Style

Above Flood
Yes
# Stories
2 Stories

More Information

Financial Status

Bank Owned
No
Potential Short Sale
No

Property Features

Fee Includes: None Tax Exemptions: None License Info: Non Trans Rntl Lic Waterfront: None Waterview: No Waterview Dockage: None Property Condition: Fixer Upper Building Style: Conch Vehicle Storage: Off Street Parking Furnished: Unfurnished Cooling: Wall/Window Unit(s) Heating: Hot Water Utilities: FKAA Construction: Frame Shutters: Other Floor: Combo Roof: Metal Roof Pets: Pets Allowed Security: No Security Land Size: Less Than 1/4 Acre Terms: Cash; Conventional Title: Title Ins - Seller
Listing Office: Coldwell Banker Schmitt Real Estate Co. (KW)
Last Updated: September - 26 - 2026
The data relating to real estate for sale on this web site comes in part from the Florida Keys MLS, Inc. Information provided is deemed reliable but not guaranteed. All properties are subject to prior sale, change or withdrawal. The information being provided is for consumers’ personal, non-commeral use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. IDX data is deemed reliable but is not guaranteed accurate by the MLS.
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