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Office BuildingCommercial
Last sold for $161,500 on Dec 18, 1997

20 WILLIAM ST

WELLESLEY, MA 02481
0
Baths
3.24 ac
Lot SizeThe size of the land the home sits on, from county records.
2001
Year BuiltThe year the home was originally built, according to county records.
1
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.$161,500 · Dec 18, 1997

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$433,991 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$42,217,000 (2025)
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$42,217,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$44,930,000

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.44
34
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
6
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
57
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
92
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
32
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.8 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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.Office Building
CountyNorfolk
Lot (acres)The size of the land the home sits on, from county records.3.24
HeatingThe type of heating system in the home.None
PoolWhether the property has a pool, and what kind, such as in-ground.No

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

E
Joseph E. Fiske Elementary SchoolA
Elementary · Grades KG–5 · 1.0 mi
H
Wellesley High SchoolA+
High · Grades 9–12 · 2.7 mi
M
Wellesley Middle SchoolA
Middle · Grades 6–8 · 3.2 mi

District: Wellesley School District

Neighborhood · ZIP 02481These 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.58
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.101
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.74

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.34%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.5%
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.16,028
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,822 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$238,777
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$335,604
Average tempThe average temperature here across a full year.49°F
Annual precipHow much rain and melted snow falls here in a typical year.47 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.52%

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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

20 William 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 lots in Wellesley Hills 02481
  • Newer than 89% of homes in Norfolk County

How it measures up in Wellesley Hills 02481

The dot is this home. The mark in the middle is the typical home in Wellesley Hills 02481.

Lot size3.24 ac
SmallerTypical 0.37 acBigger

Bigger than almost all homes nearby

Year built2001
OlderTypical 1948Newer

Newer than 84% of homes nearby

How 20 William St ranks against every home in each area.
MeasureThis homeWellesley Hills 02481Norfolk County
Lot sizebigger than3.24 acalmost all homes92% of homes
Year builtnewer than200184% of homes89% of homes

About 20 William St

When did 20 William St, Wellesley, MA last sell?

20 William St, Wellesley, MA last sold on Dec 18, 1997 for $161,500, according to the county's recorded deed.

When was 20 William St, Wellesley, MA built?

20 William St, Wellesley, MA was built in 2001, making it 25 years old. The building has 1 story.

What schools serve 20 William St, Wellesley, MA?

20 William St, Wellesley, MA is assigned to Joseph E. Fiske Elementary School (elementary), rated A; Wellesley High School (high), rated A+; Wellesley Middle School (middle), rated A. All sit in Wellesley School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 William St, Wellesley, MA compare to other homes in Wellesley Hills 02481?

Among the 4,594 homes in Wellesley Hills 02481, its lot is bigger than almost all of them (3.24 ac against a typical 0.37 ac) and it is newer than 84% of them (2001 against a typical 1948). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 20 William St, Wellesley, MA?

The 2025 property tax bill for 20 William St, Wellesley, MA was $433,991. The county assessed it at $42,217,000.

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Assigned schools

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