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Duplex (2 Units, Any Combination)Residential
Last sold for $820,000 on Dec 14, 2021

129 PROSPECT AVE

MAMARONECK, NY 10543
4
Beds
2
Baths
2,267 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.
0.11 ac
Lot SizeThe size of the land the home sits on, from county records.
1910
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.$820,000 · Dec 14, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$20,281 (2026)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$928,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$161,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$767,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$884,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$928,000

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.40
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
1
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
66
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
83
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
49
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
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.minimal

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.Traditional/Old
CountyWESTCHESTER
Lot (acres)The size of the land the home sits on, from county records.0.11
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 148 ft²

Transaction History(3)

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

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Mamaroneck Avenue Elementary SchoolB-
Elementary · Grades KG–5 · 0.7 mi
H
Mamaroneck High SchoolA
High · Grades 9–12 · 0.8 mi
M
Hommocks Middle SchoolA+
Middle · Grades 6–8 · 1.2 mi

District: Mamaroneck Union Free School District

Neighborhood · ZIP 10543These 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.73
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.112
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.108

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.32%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.19,378
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,436 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$142,458
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$176,817
Average tempThe average temperature here across a full year.53°F
Annual precipHow much rain and melted snow falls here in a typical year.49 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.55%

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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

129 Prospect Ave 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.

  • Has a smaller lot than 75% of homes in Westchester County
  • Older than 91% of homes in Westchester County

How it measures up in Mamaroneck 10543

The dot is this home. The mark in the middle is the typical home in Mamaroneck 10543.

Living area2,267 ft²
SmallerTypical 2,126 ft²Bigger

Bigger than 55% of homes nearby

Lot size0.11 ac
SmallerTypical 0.17 acBigger

Bigger than 27% of homes nearby

Year built1910
OlderTypical 1953Newer

Newer than 13% of homes nearby

How 129 Prospect Ave ranks against every home in each area.
MeasureThis homeMamaroneck 10543Westchester County
Living areabigger than2,267 ft²55% of homes57% of homes
Lot sizebigger than0.11 ac27% of homes25% of homes
Year builtnewer than191013% of homes9% of homes

About 129 Prospect Ave

When did 129 Prospect Ave, Mamaroneck, NY last sell?

129 Prospect Ave, Mamaroneck, NY last sold on Dec 14, 2021 for $820,000, according to the county's recorded deed.

How big is 129 Prospect Ave, Mamaroneck, NY?

129 Prospect Ave, Mamaroneck, NY has 4 bedrooms, 2 bathrooms, 2,267 square feet of living space and a 0.11-acre lot.

When was 129 Prospect Ave, Mamaroneck, NY built?

129 Prospect Ave, Mamaroneck, NY was built in 1910, making it 116 years old. It is a traditional/old home. The building has 2 stories.

What schools serve 129 Prospect Ave, Mamaroneck, NY?

129 Prospect Ave, Mamaroneck, NY is assigned to Mamaroneck Avenue Elementary School (elementary), rated B-; Mamaroneck High School (high), rated A; Hommocks Middle School (middle), rated A+. All sit in Mamaroneck Union Free School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 129 Prospect Ave, Mamaroneck, NY compare to other homes in Mamaroneck 10543?

Among the 4,764 homes in Mamaroneck 10543, it is bigger than 55% of them (2,267 ft² against a typical 2,126 ft²), its lot is bigger than 27% of them (0.11 ac against a typical 0.17 ac) and it is newer than 13% of them (1910 against a typical 1953). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 129 Prospect Ave, Mamaroneck, NY?

The 2026 property tax bill for 129 Prospect Ave, Mamaroneck, NY was $20,281. The county assessed it at $928,000.

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