OFF MARKET

Off market apr 2022 for $2.9M

$3,113,173

Est. refi paymentEst. refi $20,778/mo

•

3 ba

•

2,024

sq ft

800 12th St, Key Colony Beach, FL 33051

About this home

3 or 4 bedrooms plus 2 living areas, pool jacuzzi, tiki hut, beautiful waterside entertaining deck and covered poolside patio. 112 foot of seawalled dockage with boat lift. 4th lot in form opening of Shelter Bay and Vaca Cut. The dockage at this home is ONE OF THE VERY FEW in the Keys that has 6.5 ft of water depth at the dock! Generator, impact windows and doors! The home is professionally decorated and is gorgeous!

Single-familyProperty Type

1973Year Built

110 sq ftLot Size

$1,538Est. Price/Sq.Ft.

4 spacesParking

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

Bought with Samuel Williams • Coldwell Banker Schmitt Real Estate Co.

Bought with Caitlin McKinney • Coldwell Banker Schmitt Real Estate Co.

Source:FLKMLS #592625

Redfin Estimate

$3,113,173

$163K since sold in April 2022$101K since October

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 59.4% higher than the average sale price ($1.95M) 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 AUG 31, 2026
$1,450,000
B
4 beds3 baths1,926 sq ft
11295 3rd Avenue Gulf, Marathon, FL 33050
SOLD AUG 7, 2026
$2,229,000
C
3 beds3 baths2,001 sq ft
641 12th St, Key Colony Beach, FL 33051
SOLD OCT 20, 2026
$1,600,000
D
3 beds3 baths2,312 sq ft
11260 6th Avenue Gulf, Marathon, FL 33050
SOLD JUL 31, 2026
$1,400,000
E
4 beds3 baths1,740 sq ft
11250 3rd Avenue Gulf, Marathon, FL 33050
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

$3,460/mo

Redfin rental estimate

List your home for rent

Market trends in Key Colony Beach, FL

Last updated October 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

$764,000
4 beds2 baths1,380 sq ft
360 3rd St Ocean St, Key Colony, FL 33051
$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 800 12th St

Date

Event

Price

Public Records

Apr 25, 2022

Sold

$2,950,000

$1,458/sq ft

FLKMLS #592625

Mar 5, 2021

Sold

$1,745,000

$862/sq ft

Sep 18, 2020

Listed

$1,950,000

$963/sq ft

+13

Public Records

Aug 3, 2017

Sold

$1,475,000

$729/sq ft

Public Records

Sep 25, 2014

Sold

$1,100,000

$543/sq ft

Public Records

May 7, 2004

Sold

$1,100,000

$543/sq ft

Year

Property tax

Land + Additions

Assessment*

2025

$23,511 (−0.7%)

$1,274,130 + $1,209,323

$2,483,453

2024

$23,672

$1,210,424 + $1,219,947

$2,430,371

2023

$23,656 (+46.2%)

$1,210,424 + $1,193,979

$2,404,403

2022

$16,182 (+31.3%)

$978,764 + $663,399

$1,642,163

2021

$12,323 (+4.9%)

2020

$11,746 (+2.2%)

2019

$11,493 (−7.3%)

2018

$12,403 (+24.5%)

$768,580 + $518,290

$1,286,870

2017

$9,964 (+7.0%)

$539,575 + $545,223

$1,084,798

2016

$9,308 (−0.6%)

$475,701 + $460,846

$936,547

2015

$9,368 (+47.2%)

$475,701 + $460,846

$936,547

2014

$6,364

Tax history for 800 12th St

Year

Property tax

Land + Additions

Assessment*

2025

$23,511 (−0.7%)

$1,274,130 + $1,209,323

$2,483,453

2024

$23,672

$1,210,424 + $1,219,947

$2,430,371

2023

$23,656 (+46.2%)

$1,210,424 + $1,193,979

$2,404,403

2022

$16,182 (+31.3%)

$978,764 + $663,399

$1,642,163

2021

$12,323 (+4.9%)

2020

$11,746 (+2.2%)

2019

$11,493 (−7.3%)

2018

$12,403 (+24.5%)

$768,580 + $518,290

$1,286,870

2017

$9,964 (+7.0%)

$539,575 + $545,223

$1,084,798

2016

$9,308 (−0.6%)

$475,701 + $460,846

$936,547

2015

$9,368 (+47.2%)

$475,701 + $460,846

$936,547

2014

$6,364

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

Permits

Dec 22, 2023 • Final

Building

Pool and hot tub

Permit history is from public records and may be incomplete or inaccurate. Redfin and its agents make no representations about the property condition or permit status. Buyers should independently verify all information.

Property details

Interior

Bathroom Information
# of Full Baths: 3

Heating & Cooling
Heating Type: Forced Air

Exterior

Exterior Information
Physical Condition: Average
Floor Construction Type: Concrete
Foundation Type: Concrete
Exterior Wall: Concrete Block
Roof Covering Type: Clay/concrete Tile
Roof Shape Type: Gable/Hip
Building Type: Residential

Pool Information
Has Pool

Property Information
Subdivision Name: KEY COLONY BEACH 2ND ADD
Living Sq. Ft: 2,024
Gross Sq. Ft: 4,449
Ground Floor Sq. Ft: 2,024
Building Sq. Ft: 2,024
# of Units: 1
# of Stories: 2
Legal Description: BK 12 LT 41 AND N 1/2 LT 42 KEY COLONY BEACH SECOND ADDN SHELTER KEY PB4-94 OR186-480 OR327-264 OR463-666 OR521-241E OR558-1085C OR922-1509 OR2000-2076 OR2704-1241 OR2867-1066 OR3080-0052 OR3096-0354 OR3169-1676

Parking & Garage Information
Parking Type: Finished Block Garage
Garage/Parking Sq. Ft: 414
Garage / Carport Type: Finished Block

Lot Information
# of Buildings: 1
Land Sq. Ft: 110
Legal Lot Number: 41
Legal Block Number: 12
Municipality Type: KCB
Municipality Name: CITY OF KEY COLONY BEACH
Acres: 0.0025
Depth Footage: 110
Front Footage: 1
Zoning Code: INC
County Use Description: SINGLE FAMILY RES
State Use Description: SINGLE FAMILY

Location Information
Parcel Location Influence: Canal

Financial

Assessor Information
Assessment Year: 2025
Tax District County: CITY OF KEY COLONY BEACH
Tax Area: CITY OF KEY COLONY BEACH

Public facts

Beds: 4
Baths: 3.0
Sq. Ft.: 2,024
Stories: 2.0
Lot Size: 110 square feet
Style: Single Family Residential
Year Built: 1973
Year Renovated: 2013
County: Monroe County
APN: 0566 33 00077360000000

Home facts updated by county records on Apr 21, 2026

Around this home

Schools

K - 12
Preschool & daycare

Stanley Switlik Elementary School

Public PreK-5 • Assigned • 4.4mi

4/10

Marathon School

Public 6-12 • Assigned • 3.6mi

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

$2.96M – $3.58M

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

Nearby similar homes

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New listings for sale in 33051

$764,000

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Spacious backyard • Patio • Storage

$764,000

4 beds2 baths1,380 sq ft

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Spacious backyard • Patio • Storage

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Home values near 800 12th St

Data from public records.

Address	Redfin Estimate
751 12th Street, Key Colony Beach, FL 4 Beds \| 4 Baths \| 5094 Sq. Ft.	$4,633,232
701 12th Street, Key Colony Beach, FL 3 Beds \| 3 Baths \| 2509 Sq. Ft.	$2,422,641
771 12th Street, Key Colony Beach, FL 3 Beds \| 3.5 Baths \| 2773 Sq. Ft.	$3,817,380
700 12th Street, Key Colony Beach, FL 4 Beds \| 3.5 Baths \| 4180 Sq. Ft.	$4,393,661
861 12th Street, Key Colony Beach, FL 4 Beds \| 3 Baths \| 5186 Sq. Ft.	$3,544,230
781 11th Street, Key Colony Beach, FL 3 Beds \| 3.5 Baths \| 2233 Sq. Ft.	$2,098,399
761 11th Street, Key Colony Beach, FL 3 Beds \| 3 Baths \| 2166 Sq. Ft.	$2,085,363

Address	Redfin Estimate
831 12th Street, Key Colony Beach, FL 4 Beds \| 3.5 Baths \| 2314 Sq. Ft.	$3,003,719
840 12th Street, Key Colony Beach, FL 6 Beds \| 5 Baths \| 4224 Sq. Ft.	$4,037,632
760 12th Street, Key Colony Beach, FL 4 Beds \| 3.5 Baths \| 3737 Sq. Ft.	$3,837,771
731 12th Street, Key Colony Beach, FL 3 Beds \| 3.5 Baths \| 3490 Sq. Ft.	$2,717,116
800 12th Street, Key Colony, FL 4 Beds \| 3 Baths \| 2024 Sq. Ft.	$2,647,764
721 11th Street, Key Colony Beach, FL 3 Beds \| 3 Baths \| 2238 Sq. Ft.	$1,773,539
801 11th Street, Key Colony Beach, FL 5 Beds \| 5 Baths \| 3243 Sq. Ft.	$3,177,038

Address	Redfin Estimate
860 12th Street, Key Colony Beach, FL 3 Beds \| 2 Baths \| 1900 Sq. Ft.	$3,401,501
740 12th Street, Key Colony Beach, FL 3 Beds \| 2.5 Baths \| 1800 Sq. Ft.	$2,408,107
811 12th Street, Key Colony Beach, FL 3 Beds \| 4.5 Baths \| 4162 Sq. Ft.	$3,633,581
820 12th Street, Key Colony Beach, FL 6 Beds \| 3.5 Baths \| 3333 Sq. Ft.	$3,206,319
831 12th Street, Key Colony Beach, FL 3 Beds \| 3 Baths \| 2316 Sq. Ft.	$2,435,837
741 11th Street, Key Colony Beach, FL 4 Beds \| 4 Baths \| 1913 Sq. Ft.	$2,757,624
821 11th Street, Key Colony Beach, FL 3 Beds \| 3.5 Baths \| 3035 Sq. Ft.	$3,335,722

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About this home

Redfin Estimate

Earn from this home

Market trends in Key Colony Beach, FL

Sale history for 800 12th St

Tax history for 800 12th St

Permits

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 800 12th St

More real estate resources