646 William St, Key West, FL 33040
Property image
Property image
FOR SALE
NEW - 3 HRS AGO

$1,400,000

  • 3 Beds
  • 2 Baths
  • 1,780 sqft

646 William St, Key West, FL 33040

Old Town
Est. Mortgage $8,551/mo*
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Home Highlights

Multi-Family
Built in 1928
$787/sqft

Local Information

  • Map ViewExplore the area around 646 William St.
  • Schools1 Preschool School1 Elementary School1 Middle School1 High School
  • Shop & Eat
-- mins to
Commute Destination

About this House

What's unique:Two-and-a-half-story homeThree bathroomsFour bedrooms
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.
Last check for updates: about 3 hours ago
Listing courtesy of Louis M Paez, (305) 395-1081
Coldwell Banker Schmitt Real Estate Co. (KW)
Source: FLKMLS, MLS#621406
Also Listed on FLKMLS.

Home Details for 646 William St

Interior Features

Beds & Baths
Number of Bedrooms: 3Number of Bathrooms: 2Number of Bathrooms (full): 2
Dimensions and Layout
Living Area: 1780 Square Feet
Heating & Cooling
Heating: Has Heating Unspecified TypeHas CoolingAir Conditioning: Wall/Window Unit(s)Has HeatingHeating Fuel: Has Heating Unspecified Type
Windows, Doors, Floors & Walls
Flooring: Combination
Levels, Entrance, & Accessibility
Floors: Combination
View
No View
Security
Security: No Security

Exterior Features

Exterior Home Features
Patio / Porch: Open Porch/BalconyNo Private Pool
Parking & Garage
No Attached Garage
Frontage
Not on Waterfront

Days on Market

Days on Market: <1 day on Trulia

Property Information

Year Built
Year Built: 1928
Property Type / Style
Property Type: ResidentialProperty Subtype: DuplexArchitecture: Conch
Building
Construction Materials: FrameNot a New Construction
Property Information
Condition: FixerParcel Number: 00018810000000

Price & Status

Price
List Price: $1,400,000Price Per Sqft: $787

Active Status

MLS Status: Active

Location

Direction & Address
City: Key WestCommunity: Old Town - Unlisted (1.0)

Agent Information

Listing Agent
Listing ID: 621406

Building

Building Area
Building Area: 1780 Square Feet

HOA

HOA Fee Includes: NoneNo HOAHOA Fee: No HOA Fee

Lot Information

Lot Area: 3920.4 sqft

Offer

Listing Terms: Cash, Conventional

Miscellaneous

Mls Number: 621406

Around this home

Neighborhood Overview

Old Town
See Local Highlights
Neighborhood stats provided by third party data sources.

What Locals Say about Old Town

At least 1 Trulia users voted on each feature.

  • 100 % Say it's dog friendly

  • 100 % Say people would walk alone at night

  • 100 % Say there are sidewalks

  • 100 % Say streets are well-lit

  • 100 % Say neighbors are friendly

  • 100 % Say it's quiet

  • 100 % Say it's walkable to grocery stores

  • 100 % Say it's walkable to restaurants

  • 100 % Say parking is easy

  • 100 % Say car is needed

  • 67 % Say there's holiday spirit

  • 60 % Say they plan to stay for at least 5 years

  • 50 % Say there are community events

  • 50 % Say kids play outside

Sourced by Trulia users. Learn more about our methodology.
  • David Atkinson
    "I so look forward to getting to Key West. I volunteer at the Tropic and love it. It feels like home."
    0
    Flag
  • Trulia User
    "Dogs are welcomed at 90% of the restaurants. Everyone will remember your dogs name but not yours! I love living here with my dog Jack."
    0
    Flag
  • Trulia User
    "Key West is a huge dog community. They even are allowed in some restaurants . When I walk my dog on the main tourist street (Duval St) I get stopped many times from people wanting to pet my dog. A group of dog owners meet up at the park in the morning every day."
    0
    Flag
  • Sgarvin3281
    " Bikes are all you need small island. Safe and secure. No commute I do t work here it is a vacation community."
    0
    Flag
  • Trulia User
    "Everywhere dogs are welcome here in key west, Florida. Come joining us here in key west. Most food and service places, boats, and entertainment venues are good with dogs."
    0
    Flag
  • Trulia User
    "Feels very safe, super clean, super walkable in old town, and Catholic school looks very vibrant. "
    0
    Flag
  • Trulia User
    "Great people, great neighborhood, great police, family friendly events. Lots of things to do within a decent drive. Very family friendly generally "
    0
    Flag
  • Key W. B. F.
    "Gatherings on the local Mangia Mangia bench at 900 Southard street, safe & friendly town. Feel connected & welcomed in Key West. Enjoy the peaceful neighborhood & the tropical weather! You can walk or bike to everything you need & want!"
    0
    Flag
  • Kfowler
    "I am not currently aware of any neighborhood events that would bring the neighbors closer. However, both my husband and I would be open to any such event that would do so and would improve the neighborhood. The area is beautiful and well maintained, with a few exceptions. "
    2
    Flag
  • Hannah B.
    "Vintage Cottage houses, small island feel, Duval Street in a few minutes with hundreds of worldly trendy restaurants "
    6
    Flag
  • Drlynmar
    "Neighborhood newsletter. Proximity to OldTown events, festivals and parades. Walk to everything. Parks, beaches, dog park. Grocery and restaurant delivery. "
    2
    Flag
  • Venomousink1970
    "the neighborhood is great I myself do not like living in Key West anymore and looking to relocate and Asheville North Carolina or the surrounding areas people are very friendly here except for the homeless vagrants that beg for money and yell at you when you don't give them any"
    0
    Flag
  • Lorettamdt
    "Old Town is historic. Our neighbors are friendly. We walk everywhere. No need for a car. Restaurants are within walking distance. Beaches are a bicycle ride away. "
    0
    Flag
  • mangiamangia
    "Lived in this neighborhood for 25 years. Walk and anywhere. Far enough of Duval to escape the noise and drunks."
    0
    Flag
  • Sajsk
    "vacationed in that area -- charming and great location and amenities, yet quiet."
    0
    Flag
  • Rjones
    "This is a great street and great neighborhood. Qiet, yet close enough to Duval and White streets to enjoy all Key West has to offer. "
    0
    Flag

Market trends in Key West

Last updated August 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
$1.14M
$143KMoM
Sale-to-List Price
—
Price per sq ft
$865
$67MoM
Available listings
255
17MoM

Home Value

Trulia Estimate
$1.56M
Since last month
Increased$64K (+4.3%)
Since last year
Increased$4K (+0.2%)
Learn more about this home's value by checking out its Trulia Estimate, the value of nearby homes, and how much similar homes have sold for.

Trulia Estimate

The of this home's value increased by +43% in the last 10 years
MonthEstimated value
2026
September 2026$1.56M
August 2026$1.49M
July 2026$1.52M
June 2026$1.52M
May 2026$1.53M
April 2026$1.52M
March 2026$1.52M
February 2026$1.54M
January 2026$1.5M
2025
2024
2023
2020

Comparable sales

These are recently sold homes that have a similar location or other similar features to this home, like bedrooms, bathrooms, and square footage. Get a sense of the expected prices in the area by viewing these homes.
Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
621 Elizabeth St, Key West, FL
0.09
Multi-Family Home
$1,625,000
04/20/26
3
2
1,594
708 William St, Key West, FL
0.04
Multi-Family Home
$1,752,000
11/17/25
4
3.5
1,967
1022 Fleming St, Key West, FL
0.32
Multi-Family Home
$1,600,000
07/31/26
4
2
2,016
620 White St, Key West, FL
0.35
Multi-Family Home
$800,000
02/24/26
3
2
1,421
514 Margaret St, Key West, FL
0.19
Multi-Family Home
$1,400,000
01/14/26
5
3.5
2,068
1119 Simonton St #A1 & A2-c1, Key West, FL
0.36
Multi-Family Home
$1,425,000
06/17/26
2
2
1,092
1030 James St, Key West, FL
0.41
Multi-Family Home
$1,800,000
05/26/26
3
3
1,700
1113 Watson St, Key West, FL
0.39
Multi-Family Home
$1,300,000
03/20/26
5
3
1,819

Nearby home prices

Get a sense of expected prices in the area by checking the value of nearby homes.
Address
Distance
Price
Bed
Bath
Sqft
Status
628 William St, Key West, FL 33040
0.04
$2,647,700
3
2.5
1,524
Off Market
719 Windsor Ln, Key West, FL 33040
0.03
$1,411,900
3
2
1,268
Off Market
715 Windsor Ln, Key West, FL 33040
0.03
$1,665,100
3
2.5
1,524
Off Market
718 Bakers Ln, Key West, FL 33040
0.07
$1,755,900
3
2.5
1,714
Off Market
729 Windsor Ln, Key West, FL 33040
0.01
$865,000
2
1
723
Recently Sold
709 Windsor Ln #D, Key West, FL 33040
0.06
$3,342,400
4
3.5
3,353
Off Market
708 Bakers Ln, Key West, FL 33040
0.08
$1,400,000
1
1
684
Recently Sold
812 Carsten Ln, Key West, FL 33040
0.07
$2,599,000
3
2
1,204
For Sale
732 Windsor Ln, Key West, FL 33040
0.02
$1,367,400
2
2
1,060
Off Market
651 William St #1, Key West, FL 33040
0.02
$618,000
1
1
599
Off Market
708 Windsor Ln, Key West, FL 33040
0.06
$1,315,500
2
2
1,224
Off Market

Price and Tax history

DateEventPrice
Sep 25, 2026
Source: FLKMLS #621406
Listed For Sale
$1,400,000

LGBTQ Local Legal Protections

Louis M Paez, Coldwell Banker Schmitt Real Estate Co. (KW)
Agent Phone: (305) 395-1081
MLS Internet Data Exchange (IDX) information is provided exclusively for consumers’ personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing, and that the data is deemed reliable but is not guaranteed accurate by the Florida Keys MLS.

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Frequently asked questions about 646 William St

  • What is the estimated monthly payment for 646 William St?
    Based on a $1,400,000 list price with 20% down at today's rates, the estimated monthly payment for 646 William St in Key West, FL is approximately $8,834 (about $7,802 principal & interest, $957 property taxes, and $75 homeowner's insurance). This is an estimate. Actual payment depends on your loan terms.
  • How does the list price for 646 William St compare to homes in Key West?
    646 William St in Key West, FL is listed at $1,400,000, about 23% above the $1.14M median sale price in Key West.
  • What are the closest schools to 646 William St?
    The closest schools to 646 William St in Key West, FL are Horace O'bryant School (Pre-K/Elementary/Middle, rated 3/10), Key West High School (rated 4/10).
  • What is 646 William St estimated to be worth?
    Trulia's estimated value for 646 William St in Key West, FL is $1,557,000.
  • Does 646 William St have air conditioning?
    Yes, 646 William St in Key West, FL has air conditioning.
646 William St, Key West, FL 33040 is a 3 bedroom, 2 bathroom, 1,780 sqft multi-family built in 1928. 646 William St is located in Old Town, Key West. This property is currently available for sale and was listed by FLKMLS on Sep 25, 2026. The MLS # for this home is MLS# 621406.