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CondominiumResidential

21 Westerly St

WELLESLEY, MA 02482
2.03 ac
Lot SizeThe size of the land the home sits on, from county records.
1971
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
1
ParkingThe number of parking spaces on the property, including the garage.
Built 197117 units1,320–1,860 ft²
$14M
All units combinedThe sum of our current value estimates for every unit in the building — roughly what the whole building's homes are worth together.
$786K
Median unit valueThe middle unit value in this building by our estimate: half the units are worth more, half less.
$553
Median $/ft²The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.

-66.7%vs the Wellesley ZIP median sale $/ft² ($1661)

Sales Performance

$785K
Median sale (12 mo)The middle sale price among this building's units that sold in the last 12 months, from recorded deeds.
—
1-yr changeHow the building's median sale price over the last 12 months compares with the 12 months before that.
3
Sales (12 mo)Units in this building that sold in the last 12 months, from recorded arms-length deeds.
17.6%
Turnover (12 mo)The share of units that changed hands in the last 12 months. Around 4–6% a year is typical; much higher can signal investor churn or a wave of exits.
This building's own appreciationThe building's own appreciation: for every unit that sold twice (held over a year), we compute its yearly price change between the two sales and take the middle value. This is the cleanest read on how this specific building performs, because it compares each unit to itself.
+2.8%per yeartypical hold 8.2 yrsfrom 13 same-unit resales
Median sale price (yearly, all time)Every recorded arms-length sale in the building since records begin, grouped by year: the bars count sales and the line tracks the median price paid.MedianSales
19922003200720112019202220242026
Sale price per ft² (yearly, all time)The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.$/ft²
19922003200720112019202220242026

27 arms-length sales on record for this building.

Unit Mix & Floor PlansThe building's recurring floor plans, found by grouping units with identical beds, baths and square footage in county records. Larger groups are the building's standard layouts; leftover units have one-off sizes.

Every unit: size vs estimated valueEvery unit in the building as one dot: across is its size, up is our current value estimate, and color is its bedroom count. Vertical columns of dots are recurring floor plans; the height spread within a column shows how much floor, view and condition move prices for the same layout.
$730K$878K$1M$1.2M1,320 ft²1,428 ft²1,536 ft²1,644 ft²1,752 ft²1,860 ft²
2 bd3 bd
2 bed
11 units
3 bed
6 units
Recurring floor plansThe building's recurring floor plans, found by grouping units with identical beds, baths and square footage in county records. Larger groups are the building's standard layouts; leftover units have one-off sizes.
2 bd · 1.5 ba · 1,440 ft²
5 units
2 bd · 1.5 ba · 1,320 ft²
2 units
3 bd · 1.5 ba · 1,440 ft²
2 units
2 bd · 1.5 ba · 1,464 ft²
2 units
3 bd · 2.5 ba · 1,860 ft²
2 units
One-off layouts
4 units

Value DistributionHow the building's units spread across value ranges by our current estimates. A wide spread usually means big differences in size, floor or view.

$730K–$784K
8 units
$786K–$839K
5 units
$898K–$916K
2 units
$1.1M–$1.1M
1 unit
$1.2M–$1.2M
1 unit

Ownership & Financing

Owner-occupiedThe share of units where the owner lives in the unit, per county records. The rest are second homes or rentals.88%
Company-ownedUnits owned through an LLC, trust, or other company — a rough proxy for investor ownership.24%
Typical owner tenureThe middle number of years since each unit last changed hands — how long the current owners have been in place.4.7 yrs
Cash purchases (5 yrs)The share of purchases in the last 5 years with no mortgage recorded. High cash share is common in second-home and investor buildings.60%
Avg. loan-to-valueAverage current loan balance against unit value across the building. Low numbers mean owners hold lots of equity — a sign of financial stability.26%
Median owner equityThe middle dollar amount of equity (value minus loans) unit owners hold in this building.$826,232
Median tax billThe middle annual property tax bill among the building's units.$6,775
Pre-foreclosure noticesUnits with an active pre-foreclosure or foreclosure notice on file.0

Recent SalesThe latest recorded arms-length sales in the building, newest first.

Unit 3Jun 12, 2026$785,000Unit 10May 14, 2026$825,000Unit 15Nov 18, 2025$765,000Unit 8Mar 1, 2024$725,000Unit 13Jan 22, 2024$715,000Unit 6Jul 26, 2023$690,000Unit 14May 24, 2023$700,000Unit 16Dec 23, 2022$625,000Unit 11Jan 28, 2022$750,000Unit 12Dec 30, 2021$650,000

Values are TopHap estimates, not appraisals. Sales, ownership and tax figures come from recorded county documents via ATTOM and can lag by several weeks.

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.
16
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
60
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.

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Condominium
StyleThe architectural style of the home, such as ranch or colonial.Condo/Apartment
CountyNORFOLK
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.1983
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
CoolingThe type of cooling or air conditioning in the home.Yes
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
Isaac Sprague Elementary SchoolA
Elementary · Grades KG–5 · 0.3 mi
M
Wellesley Middle SchoolA
Middle · Grades 6–8 · 0.4 mi
H
Wellesley High SchoolA+
High · Grades 9–12 · 0.9 mi

District: Wellesley School District

Neighborhood · ZIP 02482These 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.79
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.99
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.70

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.93%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.27%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.4%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.9%
PopulationHow many people live in this area.13,654
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,850 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$209,564
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$298,285
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%

All UnitsEvery property record the county has at this street address, such as the units in a condo building. Prices shown are our estimates, not asking prices.

21 Westerly St
2 bd · 1.5 ba · 1,500 ft²
$839K
21 Westerly St
2 bd · 1.5 ba · 1,320 ft²
$730K
21 Westerly St # 3
2 bd · 1.5 ba · 1,320 ft²
$784K
21 Westerly St # 4
3 bd · 2.5 ba · 1,860 ft²
$1.1M
21 Westerly St # 5
2 bd · 1.5 ba · 1,440 ft²
$779K
21 Westerly St # 6
2 bd · 1.5 ba · 1,440 ft²
$839K
21 Westerly St # 7
3 bd · 2.5 ba · 1,860 ft²
$1.2M
21 Westerly St # 8
2 bd · 1.5 ba · 1,440 ft²
$761K
21 Westerly St # 9
2 bd · 1.5 ba · 1,464 ft²
$799K
21 Westerly St # 10
2 bd · 1.5 ba · 1,464 ft²
$823K
21 Westerly St # 11
2 bd · 1.5 ba · 1,440 ft²
$898K
21 Westerly St # 12
2 bd · 1.5 ba · 1,440 ft²
$759K
21 Westerly St # 13
3 bd · 1.5 ba · 1,440 ft²
$759K
21 Westerly St # 14
3 bd · 1.5 ba · 1,440 ft²
$772K
21 Westerly St # 15
3 bd · 2.5 ba · 1,464 ft²
$765K
21 Westerly St # 16
3 bd · 1.5 ba · 1,464 ft²
$786K
21 Westerly St # 17
2 bd · 1.5 ba · 1,620 ft²
$916K

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

About 21 Westerly St

How many units are in 21 Westerly St, Wellesley, MA?

21 Westerly St, Wellesley, MA has 17 residential units across built in 1971, according to county assessor records.

What is a unit at 21 Westerly St, Wellesley, MA worth?

The median TopHap Estimate across the 17 units at 21 Westerly St, Wellesley, MA is $786,444. That works out to $553 per square foot. Units run from 1,320 to 1,860 square feet. Estimates are modelled from recorded sales and assessments, not appraisals.

Is 21 Westerly St, Wellesley, MA expensive for Wellesley?

Units at 21 Westerly St, Wellesley, MA carry a median of $553 per square foot, 67% below the Wellesley median of $1661 per square foot.

How often do units sell at 21 Westerly St, Wellesley, MA?

3 units at 21 Westerly St, Wellesley, MA sold in the last 12 months, out of 27 recorded arms-length sales all time. That is a turnover rate of 17.6% of the building per year. The median sale over that period was $785K.

Have units at 21 Westerly St, Wellesley, MA appreciated?

Across 13 repeat sales of the same unit, 21 Westerly St, Wellesley, MA returned a median 2.8% per year. Because each pair is the same unit bought and sold, the figure is not distorted by which units traded. The median owner held for 8.2 years.

What floor plans does 21 Westerly St, Wellesley, MA have?

The most common plan at 21 Westerly St, Wellesley, MA is a 2-bedroom of 1,440 square feet, repeated 5 times, with a median estimate of $778,999. TopHap identifies 5 recurring plans in the building.

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