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Duplex (2 Units, Any Combination)Residential
Last sold for $8,500,000 on Apr 30, 2025

400 SOUTH ST

KEY WEST, FL 33040
5
Beds
6.5
Baths
4,008 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
0.4 ac
Lot SizeThe size of the land the home sits on, from county records.
1958
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$8,500,000 · Apr 30, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$37,725 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$4,641,974 (2025)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$4,511,151
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$9,744,773

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.39 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.100%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.1 percent coastal flood zone

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Duplex (2 Units, Any Combination)
StyleThe architectural style of the home, such as ranch or colonial.Duplex Single
CountyMONROE
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.2015
Lot (acres)The size of the land the home sits on, from county records.0.40
ConstructionThe main material the home's frame and walls are built from.Concrete Blocks
RoofThe main material covering the roof, such as asphalt shingle or tile.Metal
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
CoolingThe type of cooling or air conditioning in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.Yes
ViewThe type of view from the property, or another feature of the site that affects value.Waterfront
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 4,790 ft²ElevatorPatio · 5,140 ft²Porch · 769 ft²Boat access

Transaction History(5)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Neighborhood · ZIP 33040These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.102
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.88
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.1

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.82%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.23%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.14%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.7%
PopulationHow many people live in this area.31,854
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.222 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$86,370
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$116,488
Average tempThe average temperature here across a full year.78°F
Annual precipHow much rain and melted snow falls here in a typical year.41 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.76%

Owner Tools

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Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

400 South St measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Among the largest homes in Key West 33040
  • Has a bigger lot than 83% of homes in Key West 33040
  • Older than 87% of homes in Monroe County

How it measures up in Key West 33040

The dot is this home. The mark in the middle is the typical home in Key West 33040.

Living area4,008 ft²
SmallerTypical 1,286 ft²Bigger

Bigger than almost all homes nearby

Lot size0.4 ac
SmallerTypical 0.12 acBigger

Bigger than 83% of homes nearby

Year built1958
OlderTypical 1973Newer

Newer than 35% of homes nearby

How 400 South St ranks against every home in each area.
MeasureThis homeKey West 33040Monroe County
Living areabigger than4,008 ft²almost all homes97% of homes
Lot sizebigger than0.4 ac83% of homes77% of homes
Year builtnewer than195835% of homes13% of homes

About 400 South St

When did 400 South St, Key West, FL last sell?

400 South St, Key West, FL last sold on Apr 30, 2025 for $8,500,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 400 South St, Key West, FL?

400 South St, Key West, FL has 5 bedrooms, 6.5 bathrooms, 4,008 square feet of living space and a 0.40-acre lot.

When was 400 South St, Key West, FL built?

400 South St, Key West, FL was built in 1958, making it 68 years old. It is a duplex single home. The building has 2 stories.

How does 400 South St, Key West, FL compare to other homes in Key West 33040?

Among the 11,960 homes in Key West 33040, it is bigger than almost all of them (4,008 ft² against a typical 1,286 ft²), its lot is bigger than 83% of them (0.4 ac against a typical 0.12 ac) and it is newer than 35% of them (1958 against a typical 1973). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 400 South St, Key West, FL?

The 2024 property tax bill for 400 South St, Key West, FL was $37,725. The county assessed it at $4,641,974.

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