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$3,700,000

  • For Sale
  • Active
  • Single Family
  • 4 Beds
  • 4 Full Baths
  • 4,369 Sq. Ft.

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Open House: 11:00 AM - 1:00 PM

Saturday 7/4 11:00 AM - 1:00 PM

431 12th Street,Key Colony, FL 33051

431 12th StreetKey ColonyFL33051

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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.

Full Property Details for 431 12th St

General

  • Price: $3,700,000
  • Taxes: $14,023 (2025)
  • Status: Active
  • Type: Single Family
  • Source: 927
  • MLS ID: 619302
  • Updated: 5/13/2026
  • Added to Site: 101 day(s) ago

Interior

  • Interior Features: Entrance Foyer, Walk-in Closet(s), Built-in Cabinets, Cathedral Ceilings, Drapes/Blinds Incl, Granite Counter Top, Smoke Alarms, Split Bedroom, Storage, Window Treatments
  • Appliances: Dishwasher, Disposal, Dryer, Ice Machine, Microwave, Range, Refrigerator, Washer
  • Flooring: Tile, Carpet

Rooms

Bathrooms

  • Total Bathrooms: 4
  • Full Bathrooms: 4

Bedrooms

  • Total Bedrooms: 4

Other Rooms

  • Laundry: Laundry Room

Additional Information

  • Shared Amenities: Fire Hydrant, Bike Paths, Tennis Court(s)
  • Pool: Yes
  • Pool Description: Concrete, Heated, In Ground
  • Security/Safety: No Security

Exterior

  • Exterior Features: Rain Gutters, Lighting, Fencing, Gazebo, Sprinkler System
  • Deck/Patio: Patio
  • Porch/Patio/Deck: Patio

Parking

  • Garage: Yes
  • Attached garage: Yes
  • Parking Features: Guest, Attached

Location

  • Area: 17 - Vaca Cut - Both Sides Holiday Inn/Key Colony
  • County: Monroe
  • Subdivision: Coury Sub (53.5)
  • Driving Directions: Overseas Highway to Sadowski Causeway. Turn right onto W Ocean Dr. Turn right onto 12th St to 431 12th St on the left.

Community

  • Assoc. Fees Include: None
  • Pets Allowed: Yes

Heating & Cooling

  • Central air: Yes
  • Air Conditioning: Yes
  • Cooling Type: Central Air, Ceiling Fans(s), Attic Fan

Structural Information

  • Architectural Style: Above Flood
  • Construction: CBS, Concrete
  • Roof: Metal
  • Windows/Doors: Impact Rstnce Doors, Impact Rstnce Window, Other Windows/Doors, Shutters
  • Square Feet: 4,369
  • Sq. Ft. Source: Property Data Card
  • Year Built: 1993

Lot Features

  • Property View: Canal
  • Lot Size (Acres): 0.22
  • Lot Size (Sq. Ft.): 9,600
  • Lot Size Source: Property Data Card
  • Lot Dimensions: 80 x 120
  • Zoning: R-1A - Key Colony Single Family

Water Features

  • Water Front: Yes
  • Water View: Yes
  • Water Front Desc.: Canal Front

Financial Considerations

  • Tax Amount: $14,023.44
  • Tax Year: 2025
  • Terms: Cash, Conventional

Disclosures and Reports

  • Legal Description: Lt 13 Coury Subdivision Pb7-13 Key Colony Or801-2296 Or892-197 Or929-1531 Or940-336 Or942-2002C Or1050-558 Or1072-1943 O
  • Flood Zone: AE
  • APN: 79871001300

Listed by Florida Keys Real Estate Group, Brenner Scheel Casey (305) 783-3395

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Listing agent

— 431 12th St —

  • Brenner Scheel Casey

    Florida Keys Real Estate Group

Get Pre-Approved Today

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Schools serving 431 12th St

School District:Monroe County School District, Middle Torch Key, FL
NameGradesDistance
Stanley Switlik Elementary School
3400 Overseas Highway, Marathon, FL 33050
PK-54.4 mi
Marathon School
350 Sombrero Beach Road, Marathon, FL 33050
6-123.5 mi
Disclaimer: School attendance boundaries provided by ATTOM Data Solutions and are for reference only. Contact the school directly to verify enrollment eligibility.

Price & Sales History for 431 12th St Get Price Alerts and Save Property

Date
Details
Price
Change
Source
3/23/2026
Listed
$3,700,000
237.13%
MLS
8/09/2013
Sold
$1,097,500
—
Public Record
Get Price Alerts and Save Property
Disclaimer: Historical sales information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

Tax History for 431 12th St

Year
Property Taxes
Change
Tax Assessment
Change
2025
$14,023
—
$1,494,967
3%
2024
$14,001
2%
$1,452,835
3%
2023
$13,685
3%
$1,410,520
6%
2021
$13,347
1%
$1,329,551
-3%
2022
$13,176
-1%
$1,369,437
20%
2021
$13,347
13%
$1,145,578
-2%
2019
$11,807
—
$1,174,021
-2%
2018
$11,820
13%
$1,200,877
7%
2017
$10,440
6%
$1,122,045
13%
2016
$9,837
-3%
$992,460
-2%
2015
$10,119
1%
$1,008,422
3%
2014
$10,053
-9%
$974,515
-7%
2013
$11,077
—
$1,050,615
—
View All
Disclaimer: Historical tax information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

Estimate the Cost for 431 12th St

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*These costs are estimates, and the interest rates assume exceptional credit standing.

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Listed by Florida Keys Real Estate Group, Brenner Scheel Casey (305) 783-3395

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431 12th Street, Key Colony, FL 33051 (MLS# 619302) is a Single Family property with 4 bedrooms and 4 full bathrooms. 431 12th Street is currently listed for $3,700,000 and was received on March 23, 2026. Want to learn more about 431 12th Street? Do you have questions about finding other Single Family real estate for sale in Key Colony? You can browse all Key Colony real estate or contact a Coldwell Banker agent to request more information.

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