4,369 Sq. Ft.
$847 / Sq. Ft.
4,369
Sq. Ft.
$847
per Sq. Ft.

Description

Discover an exceptional D'Asign Source designer home in prestigious Key Colony Beach, set on a beautifully landscaped lot with effortless access to both the bay and the open ocean. This spacious 4 bedroom 4 bath, light-filled residence offers generous living areas with soaring ceilings and oversized windows that seamlessly connect the indoors with the stunning natural surroundings. The expansive ground floor is perfectly designed for entertaining and family living, featuring a large living room,...Discover an exceptional D'Asign Source designer home in prestigious Key Colony Beach, set on a beautifully landscaped lot with effortless access to both the bay and the open ocean. This spacious 4 bedroom 4 bath, light-filled residence offers generous living areas with soaring ceilings and oversized windows that seamlessly connect the indoors with the stunning natural surroundings. The expansive ground floor is perfectly designed for entertaining and family living, featuring a large living room, gourmet kitchen, formal dining area, and a dedicated media room and one guest bedroom and a two-car garage currently used as a versatile game room. A whole-home stereo system adds to the refined ambiance throughout. Built with enduring quality, the waterfront home features all-concrete construction and a brand-new custom metal imitation barrel tile roof. At the heart of this private oasis lies a beautiful swimming pool with an inviting tiki hut -- an ideal retreat for family gatherings and relaxed entertaining. Complementing this is a deep-water dock equipped with a powerful 30,000-pound hydraulic boat lift, offering effortless access to the bay and beyond. Perfectly suited for a large family or those who love to host, this magnificent Key Colony Beach estate delivers space, luxury, and unparalleled waterfront living in one of the Florida Keys' most sought-after communities.
  1. Listed by Brenner Scheel Casey • Florida Keys Real Estate Group

Property Details for 431 12th Street

Waterfront
Canal Front
Waterfront
Yes
Zoning
R-1A - Key Colony Single Family
Subdivision
Coury Sub (53.5)
Directions
Overseas Highway to Sadowski Causeway. Turn right onto W Ocean Dr. Turn right onto 12th St to 431 12th St on the left.
Building Style
Split Level
Vehicle Storage
Garage, Guest Parking, Attached
Pets
Pets Allowed
LISTING UPDATED: 04/29/2026 11:15 AM

Property Details for 431 12th Street

StatusActive
MLS #619302
Days on Market37
Taxes$14,023 / year
HOA Fees-
Condo/Co-op Fees-
Property TypeSingle Family
MLS TypeResidential / Single Family
Year Built1993
Lot Size0.22 AC / 9,600 SF
CountyMonroe County

Location

Listing Courtesy of Florida Keys Real Estate Group
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Building Information for 431 12th Street

Stories2Year Built1993Building Size-Lot Size0.22 AC / 9,600 SF

Payment Calculator

$19,800 per month

30 year fixed, 6.46% Interest

Principal and Interest

$18,631

Property Taxes

$1,169

HOA Dues

$0

The Payment Calculator is for illustrative purposes only.

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Property Information for 431 12th Street

Summary
Location and General Information
  • Waterview: Canal View
  • Area: 17 - Vaca Cut - Both Sides Holiday Inn/Key Colony
  • Absolute Longitude: 81.025879
  • Control Depth: 6
  • Listing Board: Marathon/Lower Keys
  • Side: Ocean
  • Mile Marker: 53.5
  • Marathon Neighborhood: N/A
  • Accessibility Feat: None
  • Neighborhood Feature: Tennis Courts, Bike Paths, Fire Hydrant
  • Key/Island: Key Colony
Taxes and HOA Information
  • Association Info: Mandatory Home Owners Asc: No
  • Association Info: 1st Right of Refusal: No
  • Fee Includes: None
  • Furnished: Negotiable
  • Tax Year: 2025
  • Tax Exemptions: None
Property
Lot Information
  • Lot Size: 80 X 120
  • Acres: 0.22
  • Parcel #: 00079871001300
  • Land Size: Less Than 1/4 Acre
Property and Assessments
  • Legal: Lt 13 Coury Subdivision Pb7-13 Key Colony Or801-2296 Or892-197 Or929-1531 Or940-336 Or942-2002C Or1050-558 Or1072-1943 O
  • MLS Approved: Y
  • SqFt Source: Property Data Card
  • Flood Zone: AE
  • Rentals Allowed: Yes
  • Deed Restrictions: Unknown
  • Picture Count: 31
  • Document Count: 0
  • Building Style: Above Flood: Unknown
  • Security: No Security
  • Title: Title Ins - Buyer
Utilities
  • Utilities: FKAA, Elect Separate Meter, Municipal Sewer
  • Pub Sewer HkUp: Yes
  • Pool: Yes
  • Pool Info: Heated: Yes
  • Pool Info: In Ground, Concrete
  • Porch/Balcony: Patio
Interior and Exterior Features
Interior Features
  • Floor: Tile, Carpet
  • Interior Features: Drapes/Blinds Incl, Built-in Cabinets, Window Treatments, Walk-in Closet(s), Storage, Smoke Alarms, Granite Counter Top, Entrance Foyer, Split Bedroom, Cathedral Ceilings
  • Appliances: Washer, Ice Machine, Disposal, Microwave, Range, Refrigerator, Dishwasher, Dryer
Exterior Features
  • Roof: Metal Roof
  • Shutters: Other
  • Dockage: Dock Length: 80
  • Dockage: Dock: Composite
  • Construction: CBS, Concrete
  • Dockage: Boat Lift
  • Exterior Features: Fencing, Sprinkler System, Lighting, Rain Gutters, Gazebo
  • Windows/Doors: Other Windows/Doors, Impact Rstnce Window, Impact Rstnce Doors
Room Information
  • Specialty Rooms: Laundry Room

Property History for 431 12th Street

DateEvent & SourcePriceAppreciation
Apr 28, 2026

Price Change

MiamiRE #A11992273

$3,700,000
Apr 1, 2026

Listed (Active)

MiamiRE #A11992273

$3,900,000
Mar 23, 2026

Price Change

FKMLS #619302

$3,900,000
DateEvent & SourcePrice
04/28/2026

Price Change

MiamiRE #A11992273

$3,700,000
04/01/2026

Listed (Active)

MiamiRE #A11992273

$3,900,000
03/23/2026

Price Change

FKMLS #619302

$3,900,000

For completeness, Compass often displays two records for one sale: the MLS record and the public record.

Public Records for 431 12th Street

Taxable ValueLand-Additions-Total-
Tax Record2024$14,001 ($1,167 / month)
Home Facts
Beds4Baths4Total Finished SqFt4,369 SqFtAbove Grade Finished SqFt4,369 SqFtStories2Lot Size9,600 SqFtStyleSingle Family ResidenceYear Built1993Year Renovated2008CountyMONROEAPN00079871-001300

Schools near 431 12th Street

This home is within Monroe.
Rating
School
Type
Grades
Distance
Public - PK to 5
Public - 6 to 12
Public - 9 to 12
Charter - PK to 5
Rating
School
Distance
Stanley Switlik Elementary School
PublicPK to 5

Marathon School
Public6 to 12

Coral Shores High School
Public9 to 12

Big Pine Academy
CharterPK to 5

School ratings and boundaries are provided by GreatSchools.org and Pitney Bowes. This information should only be used as a reference. Proximity or boundaries shown here are not a guarantee of enrollment. Please reach out to schools directly to verify all information and enrollment eligibility.

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431 12th Street is a single family home for sale in Key Colony Beach, FL 33051. This property was listed for sale on March 23, 2026 by Florida Keys Real Estate Group, it's currently listed at $3,700,000. It has been on the market for a total of 37 days and was last sold on July 31, 2020. This listing's school district is Monroe. Nearby schools include Stanley Switlik Elementary School, Marathon School and Coral Shores High School. 431 12th Street is a 4-bed, 4-bath, 4,369 sqft single family home built in 1993.

No guarantee, warranty or representation of any kind is made regarding the completeness or accuracy of descriptions or measurements (including square footage measurements and property condition), such should be independently verified, and Compass, Inc., its subsidiaries, affiliates and their agents and associated third parties expressly disclaims any liability in connection therewith. Photos may be virtually staged or digitally enhanced and may not reflect actual property conditions. Offers of compensation are subject to change at the discretion of the seller. No financial or legal advice provided. Equal Housing Opportunity. Subject to change at any time. Compass, Inc., its subsidiaries, affiliates and their agents and associated third parties make no guarantee, warranty or representation regarding the accuracy of any waterfront feature, water view or waterfront view.

Listing Courtesy of Florida Keys Real Estate Group

Based on information from one of the following Multiple Listing Services: Beaches Multiple Listing Service, Inc., Martin County REALTORS® of the Treasure Coast, Inc., Miami Association of REALTORS®. Information being provided is for the visitor’s personal, noncommercial use and may not be used for any purpose other than to identify prospective properties visitor may be interested in purchasing. The data contained herein is copyrighted by Beaches Multiple Listing Service, Inc., Martin County REALTORS® of the Treasure Coast, Inc., Miami Association of REALTORS® is protected by all applicable copyright laws. Any dissemination of this information is in violation of copyright laws and is strictly prohibited. Property information referenced on this web site comes from the Internet Data Exchange (IDX) program of the MLS. This web site may reference real estate listing(s) held by a brokerage firm other than the broker and/or agent who owns this web site. For the avoidance of doubt, the accuracy of all information, regardless of source, is deemed reliable but not guaranteed and should be personally verified through personal inspection by and/or with the appropriate professionals.