520 12th St, Key Colony, FL 33051 - Photo 1

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$2,350,000

For Sale
Active
Single Family
2 Beds
2 Full Baths
1,584 Sq. Ft.
Updated 20 hours ago

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Property Description

Welcome to an exceptional island retreat in the heart of Key Colony Beach. This beautifully elevated single-family residence embodies refined coastal luxury, offering 3 bedrooms and 2 bathrooms, additional space with no detail overlooked. Thoughtfully renovated, the home features a new metal roof, impact-rated windows and doors, elegant LVT flooring, designer lighting, custom cabinetry, and exquisite Cambria quartz countertops throughout. Outdoors, the property transforms into a private resort. Lush tropical landscaping and ambient exterior lighting set the tone, while an outdoor shower, custom bar, and sparkling pool create the perfect setting for entertaining or unwinding in complete privacy. Boating enthusiasts will appreciate 75 feet of concrete dockage with a composite step-down system, seamlessly blending function with style. An expansive, titled upper deck offers a sophisticated space for gatherings, sunset cocktails, and elevated island living. Ideally positioned just moments from the iconic Sunset Park, this residence delivers a rare combination of luxury, lifestyle, and location. A truly turnkey opportunity to own a distinguished piece of paradise in Key Colony Beach. Schedule your private showing today.

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Full Property Details

Full Property Details for 520 12th St

General

Price: $2,350,000
Taxes: $14,635 (2025)
Status: Active
Type: Single Family
Source: Greater_Miami
MLS ID: A11972821
Updated: 2/26/2026
Added to Site: 51 day(s) ago

Interior

Interior Features: Second Floor Entry, Other
Appliances: Dishwasher, Dryer, Microwave, Electric Range, Refrigerator, Washer
Flooring: Tile

Rooms

Bathrooms

Total Bathrooms: 2
Full Bathrooms: 2
Primary Bathroom: None

Bedrooms

Total Bedrooms: 2
Bedroom Features: None

Other Rooms

Living Room: Other Sq. Ft.

Additional Information

Pool: Yes
Pool Description: Fiberglass

Exterior

Exterior Features: Open Balcony
Deck/Patio: Open Balcony, Patio

Parking

Garage: Yes
Garage Spaces: 1
Covered Spaces: 1
Parking Features: Driveway

Location

Area: Key Colony Beach 2nd Add
County: Monroe County
Subdivision: KEY COLONY BEACH 2ND ADD
Building Name: KEY COLONY BEACH 2ND ADD
Driving Directions: Follow Overseas Highway to Marathon. Take a left at Key Colony Beach/Sadowski Causeway. Follow the road to Ocean Drive. Take a right. Proceed to 12th Street. Take a right. The home is on the right.
Direction Faces: Southwest

Community

Community Name: Key Colony Beach 2nd Add

Heating & Cooling

Air Conditioning: Yes
Cooling Type: Central Air
Heating Type: None

Utilities

Sewer: Public Sewer
Water: Municipal Water

Structural Information

Architectural Style: Attached, One Story
Structure Type: House
Detached/Attached: Detached
Construction: Concrete Block Construction
Roof: Metal Roof
Windows: Partial Impact Glass
Building Size: 4326
Square Feet: 1,584
Living Area: 1,584 Sq. Ft.
Year Built: 1985

Lot Features

Property View: Canal
Lot Size (Sq. Ft.): 8,250
Frontage Feet: 75
Lot Features: Less Than 1/4 Acre Lot
Zoning: R-1A

Water Features

Water Front: Yes
Water View: Yes
Water Front Desc.: Ocean Access, Canal Front

Financial Considerations

Price Per Sq. Ft.: $1,483.59
Tax Amount: $14,635
Tax Year: 2025
Terms: All Cash, Conventional

Disclosures and Reports

Legal Description: BK 12 N 62.5 FT LT 55 AND S 12.5 FT LT 54 KEY COLONY BEACH SECOND ADDN PB4-94 SHELTER KEY OR186-480 OR452-463 OR909-1625 OR910-96 OR1268-140
Restrictions: No Restrictions
Inclusions: Private Dock
Property ID: 00077500-000000

Listed by Florida Keys Real Estate Group

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Schools

Schools serving 520 12th St

School District:Monroe County School District, Middle Torch Key, FL

Name	Grades	Distance
Stanley Switlik Elementary School 3400 Overseas Highway, Marathon, FL 33050	PK-5	4.4 mi
Marathon School 350 Sombrero Beach Road, Marathon, FL 33050	6-12	3.5 mi

Disclaimer: School attendance boundaries provided by Pitney Bowes and are for reference only. Contact the school directly to verify enrollment eligibility.

Price & Sales History for 520 12th St Get Price Alerts and Save Property

Date

Details

Price

Change

Source

1/08/2026

Listed

$2,350,000

38.24%

MLS

12/18/2024

Sold

$1,700,000

—

Public Record

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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

Tax History for 520 12th St

Year

Property Taxes

Change

Tax Assessment

Change

2024

$6,119

—

$1,518,899

142%

2024

$6,119

3%

$626,494

3%

2023

$5,918

2%

$608,247

6%

2021

$5,785

1%

$573,333

-3%

2022

$5,739

-1%

$590,532

4%

2021

$5,785

7%

$565,418

2%

2019

$5,402

6%

$552,706

2%

2018

$5,109

4%

$542,401

2%

2017

$4,889

-2%

$531,245

2%

2016

$4,981

—

$520,319

1%

2015

$4,984

-2%

$516,702

1%

2014

$5,070

-1%

$512,601

1%

2013

$5,113

—

$505,026

—

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

Estimate the Cost for 520 12th St

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Sold

$2,675,000

101 Windy Point Cir Marathon, FL 33050

Single Family
Closed

4
Beds
3
Total Baths
3,260
Sq. Ft.

Listed by Bluecastle Real Estate, Martin Baglioni
Sold by Coldwell Banker Schmitt Real Estate Co., Teri Hiller

335 Calzada De Bouganvillea, Marathon, FL 33050 - Photo 1

Sold

$2,525,000

335 Calzada De Bouganvillea Marathon, FL 33050

Single Family
Closed

3
Beds
3
Total Baths

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Sold

$2,525,000

335 Calzada De Bougainvillea Marathon, FL 33050

Single Family
Closed

3
Beds
3
Total Baths
2,430
Sq. Ft.

Listed by Venture Realty Group, Tracey E. Petrusha and Venture Realty Group, Michael Petrusha
Sold by Compass FLORIDA, Maria Macias

58618 Overseas Hwy, Marathon, FL 33050 - Photo 1

Sold

$2,200,000

58618 Overseas Hwy Marathon, FL 33050

Single Family
Closed

4
Beds
5
Total Baths
2,433
Sq. Ft.

Listed by Gilles Rais Fine Homes Team

520 12th St, Key Colony, FL 33051 (MLS# A11972821) is a Single Family property with 2 bedrooms and 2 full bathrooms. 520 12th St is currently listed for $2,350,000 and was received on January 08, 2026. Want to learn more about 520 12th St? 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.

520 12th St Key Colony, FL 33051