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646 William Street, 
Key West, FL 33040

$1,400,000

3

Beds

2

Baths

1,780

Sq Ft

Multi-Family

Active

Listed by

Louis M Paez

Coldwell Banker Schmitt Real Estate Co. (Kw)

Last updated:

October 1, 2026, 03:54 PM

MLS#

621406

Source:

FL FKBOR

About This Home

646 William Street

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.

Home Facts

Multi-Family

2 Baths

3 Bedrooms

Built in 1928

Subdivision & Development:

Old Town - Unlisted (1.0)

Price Summary

1,400,000

$786 per Sq. Ft.

MLS #:

621406

Last Updated:

October 1, 2026, 03:54 PM

Added:

10 day(s) ago

Rooms & Interior

Bedrooms

Total Bedrooms:

3

Bathrooms

Total Bathrooms:

2

Structure

Structure

Building Area:

1,780 Sq. Ft.

Year Built:

1928

Lot

Lot Size (Sq. Ft):

4,116

Finances & Disclosures

Finances

Price:

$1,400,000

Price per Sq. Ft:

$786 per Sq. Ft.

Source:FL FKBOR
The information being provided by Florida Keys Board Of REALTORS®, Inc. is for the consumer’s personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. The information is deemed reliable but not guaranteed and should therefore be independently verified. © 2026 Florida Keys Board Of REALTORS®, Inc. All rights reserved. FL FKBOR Member Broker: Brian Schmitt

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Contact an Agent

Yes, I would like more information. Please use and/or share my information with a Coldwell Banker ® affiliated agent to contact me about my real estate needs. By clicking Contact, I request to be contacted by phone or text message and consent to being contacted by automated means. I understand that my consent to receive calls or texts is not a condition of purchasing any property, goods, or services. Alternatively, I understand that I can access real estate services by email or I can contact the agent myself.

If a Coldwell Banker affiliated agent is not available in the area where I need assistance, I agree to be contacted by a real estate agent affiliated with another brand owned or licensed by Anywhere Real Estate (BHGRE®, CENTURY 21®, Corcoran®, ERA®, or Sotheby's International Realty®). I acknowledge that I have read and agree to the terms of use and privacy notice.