OFF MARKET

Off market aug 2015 for $1.2M

$2,772,410

Est. refi paymentEst. refi $3,006/mo

•

2,462

sq ft

100 12 St, Key Colony Beach, FL 33051

About this home

Single-familyProperty Type

1961Year Built

0.67 acresLot Size

$1,126Est. Price/Sq.Ft.

1 garage spacesParking

Listed by Gail Borysiewicz • Gail's Island Realty, Inc.

Bought with Kimberly Portner • American Caribbean Real Estate - Middle Keys

Redfin checked: a few seconds ago

•Source:FLKMLS #568361

Redfin Estimate

$2,772,410

$1.6M since sold in August 2015$14K since September

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 36.5% higher than the average sale price ($2.03M) of 6 comparable homes.

SOLD SEP 1, 2026
$1,790,000
A
4 beds3 baths1,860 sq ft
600 12Th St, Key Colony, FL 33051
SOLD JUL 31, 2026
$1,400,000
B
4 beds3 baths1,740 sq ft
11250 3rd Avenue Gulf, Marathon, FL 33050
SOLD AUG 31, 2026
$1,450,000
C
4 beds3 baths1,926 sq ft
11295 3rd Avenue Gulf, Marathon, FL 33050
SOLD JUN 30, 2026
$2,246,845
D
3 beds3 baths2,452 sq ft
11399 6th Ave Ocean, Marathon, FL 33050
SOLD JUN 26, 2026
$2,050,000
E
5 beds3 baths2,347 sq ft
125 13th St, Key Colony Beach, FL 33051
SOLD APR 9, 2026
$3,250,000
F
3 beds3 baths2,600 sq ft
781 9Th St, Key Colony Beach, FL 33051

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Earn from this home

Refinance

Est. cash available

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Rent

$4,075/mo

Redfin rental estimate

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Market trends in Key Colony Beach, FL

Last updated September 2026

Buyer's Market

Seller's Market

Buyer's market

Sale-to-list price

94.1%

1.2% MoM

Median sale price

$1.3M

$516K MoM

Avg. days on market

203d

1 days MoM

Recently sold homes

1 MoM

New listings for sale

NEW 29 HRS AGO
$764,000
4 beds2 baths1,380 sq ft
360 3rd St Ocean St, Key Colony, FL 33051
NEW 29 HRS AGO
$764,000
4 beds2 baths1,380 sq ft
360 3rd St, Key Colony, FL 33051
(305) 570-4305
See all

Provided by Redfin

Sale history for 100 12 St

Year

Property tax

Land + Additions

Assessment*

2025

$20,057 (+4.0%)

2024

$19,286 (+5.5%)

2023

$18,289 (+15.3%)

2022

$15,862 (+11.4%)

2021

$14,244 (+7.4%)

$849,895 + $527,631

$1,377,526

2020

$13,259 (−0.6%)

$789,188 + $536,416

$1,325,604

2019

$13,345 (−1.1%)

$789,188 + $536,416

$1,325,604

2018

$13,500 (+32.9%)

2017

$10,161 (+0.4%)

$652,598 + $486,879

$1,139,477

2015

$10,122 (+9.5%)

$573,769 + $364,894

$938,663

2014

$9,243

Tax history for 100 12 St

Year

Property tax

Land + Additions

Assessment*

2025

$20,057 (+4.0%)

2024

$19,286 (+5.5%)

2023

$18,289 (+15.3%)

2022

$15,862 (+11.4%)

2021

$14,244 (+7.4%)

$849,895 + $527,631

$1,377,526

2020

$13,259 (−0.6%)

$789,188 + $536,416

$1,325,604

2019

$13,345 (−1.1%)

$789,188 + $536,416

$1,325,604

2018

$13,500 (+32.9%)

2017

$10,161 (+0.4%)

$652,598 + $486,879

$1,139,477

2015

$10,122 (+9.5%)

$573,769 + $364,894

$938,663

2014

$9,243

*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.

Public record

Beds

Baths

Stories

Lot width

—

Lot depth

—

Lot size

7,150 Sq. Ft.

Year renovated

2006

Sq. Ft.

3,497

Year built

1961

Style

Single Family Residential

County

Monroe County

APN

0566 33 00077690000000

Parking Spaces

—

Basement

—

Accessible

—

HOA Dues

—

Garage

—

Features

—

Last updated by owner on Apr 21, 2026.

Property details

Parking

Parking / Garage Information
Vehicle Storage: Auto Door Opener, Garage
Vehicle Storage: Car(s): 2

Interior

Interior Features
Interior Features: Cathedral Ceilings, Smoke Alarms, Wet Bar, Storage, Split Bedroom, Dade County Pine, Drapes/Blinds Incl
Flooring: Carpet, Tile Floor
Windows/Doors: Aluminum Windows, Sliding Glass Doors
Cooling/Heating: Ceiling Fans, Window/Wall Unit, Central A/C
Appliances: Dryer, Washer, Wine Cooler, Refrigerator, Microwave, Oven
Furnished: Furnished

Bathroom Information
# of Full Baths: 3

Exterior

Boat Slip/Dock Information
Dockage: Seawall: Concrete
Dockage: Boat Lift
Dockage: Dock: Wood

Exterior Features
Exterior Features: Detached Guest Qtrs, Sprinkler System, Storage, Privacy Wall/Fence, Fruit Tree(s)
Porch/Balcony: Patio

Security
Patrolled Area

Property Features
On Waterfront
Waterfront Type: Canal Front
Waterview: Canal View

Property Information
Deed Restrictions: No
Pets: Pets Allowed
Rentals Allowed: Yes

Lot Information
Acres: 0.67
Zoning: R-1A - Key Colony Single Family
Land Size: 1/2 - Less Than 1 AC
Control Depth: 6
Flood Zone: AE

Building Information
Year Built: 1,961
Sq. Ft. Source: Tax Records
Building Style: Ground Level
Building Style: Above Flood: Unknown
Construction: CBS
Roof: Tar/Gravel Roof

Subdivision/Neighborhood
Subdivision: Key Colony Bch 1st Addn Amd Plat (53.5)

Financial

Tax Information
Taxes: $9,243.72
Tax Year: 2,014
Tax Exemptions: Homestead

Financial Information
Terms: Buyer Obtain Finance

Utilities

Utility Information
Utilities: Community Sewer Plant, Elect Separate Meter, FKAA
Pre-Wired: Cable
Has Public Sewer Hook-up

Location

Multi-Unit Information
# of Total Units: 1

Homeowners Association Information
Fee Includes: None

Location Information
Side: Ocean
Mile Marker: 53.50

Neighborhood Features
Tennis Courts

Public facts

Beds: 4
Baths: 3.0
Sq. Ft.: 3,497
Stories: 1.0
Lot Size: 7,150 square feet
Style: Single Family Residential
Year Built: 1961
Year Renovated: 2006
County: Monroe County
APN: 0566 33 00077690000000

Home facts updated by county records on Apr 21, 2026

Around this home

Schools

Stanley Switlik Elementary School

Public PreK-5 • Assigned • 4.4mi

4/10

Marathon School

Public 6-12 • Assigned • 3.5mi

4/10

Provided by GreatSchools

Lifestyle

Provided by Walk Score and Local Logic

Climate risks

1/10 Flood Factor

Minimal risk of a flood reaching the building in the next 30 years

1/10 Fire Factor

Unlikely to be in a wildfire in next 30 years

Heat Factor

We're working on getting current and accurate heat risk information for this home.

10/10 Wind Factor

99% chance of strong winds in next 30 years

1/10 Air Factor

0 unhealthy days expected this year, 0 days in 30 years

Provided by First Street

Historical weather

Key Colony Beach, FL • 33051

Average low and high temperatures (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sun exposure

In this area, properties receive around 10 hours in June and 7.3 hours in December, placing it above the U.S. average for solar exposure.

10 hrs

7.3 hrs

JuneDecember

Provided by Shadowmap

Estimated sale price

$2.63M – $3.19M

Sell confidently with a local market expert in Key Colony Beach. 3 minutes to get started.

Nearby similar homes

NEW 6 HRS AGO

$1,500,000

3 beds2 baths1,188 sq ft

387 82nd Street Ocean St, Marathon, FL 33050

Heated pool • Outdoor kitchen • Income potential

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3 beds3 baths2,166 sq ft

391 10th St, Key Colony Beach, FL 33051

Waterfront living • Interior staircase • Wood deck

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3 beds2 baths1,834 sq ft

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Waterfront residence • Private pool • Dock

NEW CONSTRUCTION

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Open-concept layouts • Chef's kitchens • Smart refrigerator

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Bay access • Ocean access • Deep-water dock

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New listings for sale in 33051

NEW 29 HRS AGO

$764,000

4 beds2 baths1,380 sq ft

360 3rd St Ocean St, Key Colony, FL 33051

Spacious backyard • Patio • Storage

NEW 29 HRS AGO

$764,000

4 beds2 baths1,380 sq ft

360 3rd St, Key Colony, FL 33051

Spacious backyard • Patio • Storage

(305) 570-4305

Home values near 100 12 St

Data from public records.

Address	Redfin Estimate
181 12th St, Key Colony Beach, FL 3 Beds \| 2 Baths \| 1775 Sq. Ft.	—
12 12th St, Key Colony Beach, FL 1 Beds \| 2 Baths \| 780 Sq. Ft.	$671,551

Address	Redfin Estimate
161 12th St, Key Colony Beach, FL 5 Beds \| 5 Baths \| 6007 Sq. Ft.	$10,167,799
161 11th St, Key Colony Beach, FL 3 Beds \| 3 Baths \| 1425 Sq. Ft.	$2,034,110

Address	Redfin Estimate
150 12th St, Key Colony Beach, FL 5 Beds \| 4 Baths \| 5567 Sq. Ft.	$4,499,952
1058 West Ocean Dr, Key Colony Beach, FL 2 Beds \| 2.5 Baths \| 1418 Sq. Ft.	$902,991

Property information provided by FLKMLS when last listed in 2015. This data may not match . Learn more.

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GreatSchools Ratings provided by GreatSchools.org.

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About this home

Redfin Estimate

Earn from this home

Market trends in Key Colony Beach, FL

Sale history for 100 12 St

Tax history for 100 12 St

Public record

Property details

Around this home

Schools

Lifestyle

Climate risks

Historical weather

Sun exposure

Nearby similar homes

New listings for sale in 33051

Home values near 100 12 St

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