CondominiumResidential
500 Union St
WESTBOROUGH, MA 01581
1.19 ac
Lot SizeThe size of the land the home sits on, from county records.
2007
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
Built 200754 floors44 units1,017–1,532 ft²
$23M
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.
$525K
Median unit valueThe middle unit value in this building by our estimate: half the units are worth more, half less.
$375
Median $/ft²The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.
-6.7%vs the Westborough ZIP median sale $/ft² ($402)
Sales Performance
—
Median sale (12 mo)The middle sale price among this building's units that sold in the last 12 months, from recorded deeds.
—
1-yr changeHow the building's median sale price over the last 12 months compares with the 12 months before that.
0
Sales (12 mo)Units in this building that sold in the last 12 months, from recorded arms-length deeds.
0.0%
Turnover (12 mo)The share of units that changed hands in the last 12 months. Around 4–6% a year is typical; much higher can signal investor churn or a wave of exits.
This building's own appreciationThe building's own appreciation: for every unit that sold twice (held over a year), we compute its yearly price change between the two sales and take the middle value. This is the cleanest read on how this specific building performs, because it compares each unit to itself.
+4.2%per yeartypical hold 8.6 yrsfrom 29 same-unit resales
Median sale price (yearly, all time)Every recorded arms-length sale in the building since records begin, grouped by year: the bars count sales and the line tracks the median price paid.MedianSales
20092011201320152018202120232025
Sale price per ft² (yearly, all time)The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.$/ft²
20092011201320152018202120232025
72 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.
1 bd2 bd
1 bed
6 units$415K · $401/ft²
2 bed
38 units$527K · $374/ft²
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 · 2 ba · 1,423 ft²
6 units$530K · $373/ft²
2 bd · 2 ba · 1,296 ft²
4 units$502K · $387/ft²
2 bd · 2 ba · 1,413 ft²
4 units$523K · $370/ft²
2 bd · 2 ba · 1,342 ft²
3 units$513K · $382/ft²
2 bd · 2 ba · 1,369 ft²
3 units$524K · $382/ft²
1 bd · 1.5 ba · 1,017 ft²
2 units$408K · $401/ft²
1 bd · 1.5 ba · 1,027 ft²
2 units$420K · $409/ft²
1 bd · 1.5 ba · 1,071 ft²
2 units$417K · $389/ft²
2 bd · 2 ba · 1,310 ft²
2 units$512K · $391/ft²
2 bd · 2 ba · 1,421 ft²
2 units$524K · $369/ft²
2 bd · 2 ba · 1,429 ft²
2 units$539K · $377/ft²
2 bd · 2 ba · 1,448 ft²
2 units$540K · $373/ft²
2 bd · 2 ba · 1,483 ft²
2 units$558K · $376/ft²
2 bd · 2 ba · 1,519 ft²
2 units$550K · $362/ft²
One-off layouts
6 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.
$407K–$425K
6 units
$498K–$502K
3 units
$503K–$521K
4 units
$522K–$539K
20 units
$541K–$560K
11 units
Value by Floor & LineAverage estimated price per square foot by floor range, using unit numbers to infer floors. Higher floors usually price higher — the gap shows how much the view is worth here.
Unit lines by $/ft²Condo units stacked vertically share a unit line — the last digits of the unit number (like 05 in 1205, 1305, 1405). Lines share a layout and exposure, so comparing estimated $/ft² by line shows which position in the building commands a premium.
Line ·03
$397/ft²3 units · +6%
Line ·07
$396/ft²3 units · +6%
Line ·09
$392/ft²3 units · +5%
Line ·14
$384/ft²3 units · +3%
Line ·16
$383/ft²3 units · +2%
Line ·01
$383/ft²3 units · +2%
Line ·04
$379/ft²3 units · +1%
Line ·06
$374/ft²3 units · +0%
Line ·11
$374/ft²3 units · +0%
Line ·15
$373/ft²3 units · -1%
Line ·12
$372/ft²3 units · -1%
Line ·05
$372/ft²3 units · -1%
Ownership & Financing
Owner-occupiedThe share of units where the owner lives in the unit, per county records. The rest are second homes or rentals.14%
Company-ownedUnits owned through an LLC, trust, or other company — a rough proxy for investor ownership.20%
Typical owner tenureThe middle number of years since each unit last changed hands — how long the current owners have been in place.11.0 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.36%
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.37%
Median owner equityThe middle dollar amount of equity (value minus loans) unit owners hold in this building.$530,520
Median tax billThe middle annual property tax bill among the building's units.$7,652
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 5203Jun 13, 2025$517,125$399/ft²Unit 5416May 28, 2025$525,000$391/ft²Unit 5404May 22, 2025$560,000$394/ft²Unit 5414Feb 28, 2025$505,000$385/ft²Unit 5304Oct 25, 2024$535,000$376/ft²Unit 5407Sep 13, 2024$428,000$417/ft²Unit 5408Apr 30, 2024$425,000$397/ft²Unit 5314Apr 30, 2024$500,000$386/ft²Unit 5216Jul 21, 2023$500,000$373/ft²Unit 5216Oct 21, 2022$480,000$358/ft²
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
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.6 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
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.Condominium
StyleThe architectural style of the home, such as ranch or colonial.Condo/Apartment
CountyWORCESTER
ConstructionThe main material the home's frame and walls are built from.Steel Frame
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
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.
HME
Westborough High SchoolA
High · Grades 9–12 · 0.5 mi
Sarah W. Gibbons Middle SchoolA
Middle · Grades 7–8 · 0.7 mi
Elsie A.Hastings Elementary SchoolA
Elementary · Grades KG–3 · 0.8 mi
District: Westborough School District
Neighborhood · ZIP 01581These 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.65
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 100.59
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.33%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.5%
PopulationHow many people live in this area.21,880
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,023 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$137,510
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$171,995
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.48 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.50%
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.
500 Union St # 5201
2 bd · 2 ba · 1,369 ft²
500 Union St # 5202
2 bd · 2 ba · 1,421 ft²
500 Union St # 5203
2 bd · 2 ba · 1,296 ft²
500 Union St # 5204
2 bd · 2 ba · 1,423 ft²
500 Union St # 5205
2 bd · 2 ba · 1,413 ft²
500 Union St # 5206
2 bd · 2 ba · 1,483 ft²
500 Union St # 5207
2 bd · 2 ba · 1,455 ft²
500 Union St # 5209
2 bd · 2 ba · 1,420 ft²
500 Union St # 5210
2 bd · 2 ba · 1,519 ft²
500 Union St # 5211
2 bd · 2 ba · 1,413 ft²
500 Union St # 5212
2 bd · 2 ba · 1,423 ft²
500 Union St # 5214
2 bd · 2 ba · 1,296 ft²
500 Union St # 5215
2 bd · 2 ba · 1,448 ft²
500 Union St # 5216
2 bd · 2 ba · 1,342 ft²
500 Union St # 5301
2 bd · 2 ba · 1,369 ft²
500 Union St # 5302
2 bd · 2 ba · 1,421 ft²
500 Union St # 5303
2 bd · 2 ba · 1,296 ft²
500 Union St # 5304
2 bd · 2 ba · 1,423 ft²
500 Union St # 5305
2 bd · 2 ba · 1,413 ft²
500 Union St # 5306
2 bd · 2 ba · 1,483 ft²
500 Union St # 5307
1 bd · 1.5 ba · 1,017 ft²
500 Union St # 5308
1 bd · 1.5 ba · 1,071 ft²
500 Union St # 5309
1 bd · 1.5 ba · 1,017 ft²
500 Union St # 5310
2 bd · 2 ba · 1,519 ft²
500 Union St # 5311
2 bd · 2 ba · 1,413 ft²
500 Union St # 5312
2 bd · 2 ba · 1,423 ft²
500 Union St # 5314
2 bd · 2 ba · 1,296 ft²
500 Union St # 5315
2 bd · 2 ba · 1,448 ft²
500 Union St # 5316
2 bd · 2 ba · 1,342 ft²
500 Union St # 5401
2 bd · 2 ba · 1,369 ft²
500 Union St # 5402
2 bd · 2 ba · 1,430 ft²
500 Union St # 5403
2 bd · 2 ba · 1,310 ft²
500 Union St # 5404
2 bd · 2 ba · 1,423 ft²
500 Union St # 5405
2 bd · 2 ba · 1,429 ft²
500 Union St # 5406
2 bd · 2 ba · 1,496 ft²
500 Union St # 5407
1 bd · 1.5 ba · 1,027 ft²
500 Union St # 5408
1 bd · 1.5 ba · 1,071 ft²
500 Union St # 5409
1 bd · 1.5 ba · 1,027 ft²
500 Union St # 5410
2 bd · 2 ba · 1,532 ft²
500 Union St # 5411
2 bd · 2 ba · 1,429 ft²
500 Union St # 5412
2 bd · 2 ba · 1,423 ft²
500 Union St # 5414
2 bd · 2 ba · 1,310 ft²
500 Union St # 5415
2 bd · 2 ba · 1,457 ft²
500 Union St # 5416
2 bd · 2 ba · 1,342 ft²
Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.
About 500 Union St
How many units are in 500 Union St, Westborough, MA?
500 Union St, Westborough, MA has 44 residential units across 54 floors, built in 2007, according to county assessor records.
What is a unit at 500 Union St, Westborough, MA worth?
The median TopHap Estimate across the 44 units at 500 Union St, Westborough, MA is $525,069. That works out to $375 per square foot. Units run from 1,017 to 1,532 square feet. Estimates are modelled from recorded sales and assessments, not appraisals.
Is 500 Union St, Westborough, MA expensive for Westborough?
Units at 500 Union St, Westborough, MA carry a median of $375 per square foot, 7% below the Westborough median of $402 per square foot.
How often do units sell at 500 Union St, Westborough, MA?
0 units at 500 Union St, Westborough, MA sold in the last 12 months, out of 72 recorded arms-length sales all time. That is a turnover rate of 0.0% of the building per year.
Have units at 500 Union St, Westborough, MA appreciated?
Across 29 repeat sales of the same unit, 500 Union St, Westborough, MA returned a median 4.2% 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 8.6 years.
What floor plans does 500 Union St, Westborough, MA have?
The most common plan at 500 Union St, Westborough, MA is a 2-bedroom of 1,423 square feet, repeated 6 times, with a median estimate of $530,387. TopHap identifies 14 recurring plans in the building.
More homes on Union St
- 500 Union St # 5203$522K2 bd · 2 ba · 1,296 ft² · Sold $517K · Jun 2025
- 500 Union St # 5416$522K2 bd · 2 ba · 1,342 ft² · Sold $525K · May 2025
- 500 Union St # 5404$557K2 bd · 2 ba · 1,423 ft² · Sold $560K · May 2025
- 500 Union St # 5414$502K2 bd · 2 ba · 1,310 ft² · Sold $505K · Feb 2025
- 500 Union St # 5304$531K2 bd · 2 ba · 1,423 ft² · Sold $535K · Oct 2024
- 500 Union St # 5407$425K1 bd · 1.5 ba · 1,027 ft² · Sold $428K · Sep 2024
- 500 Union St # 5408$420K1 bd · 1.5 ba · 1,071 ft² · Sold $425K · Apr 2024
- 500 Union St # 5314$498K2 bd · 2 ba · 1,296 ft² · Sold $500K · Apr 2024
- 500 Union St # 5216$508K2 bd · 2 ba · 1,342 ft² · Sold $500K · Jul 2023
- 500 Union St # 5305$526K2 bd · 2 ba · 1,413 ft² · Sold $495K · Jul 2022
- 500 Union St # 5204$530K2 bd · 2 ba · 1,423 ft² · Sold $458K · Aug 2021
- 500 Union St # 5202$523K2 bd · 2 ba · 1,421 ft² · Sold $440K · Jan 2021
Closest homes
- 500 Union St$420K0 ft · 1 bd · 1.5 ba · 1,071 ft² · Sold $425K · Apr 2024
- 500 Union St$525K0 ft · 2 bd · 2 ba · 1,369 ft² · Sold $379K · Oct 2017
- 500 Union St$531K0 ft · 2 bd · 2 ba · 1,423 ft² · Sold $535K · Oct 2024
- 500 Union St$539K0 ft · 2 bd · 2 ba · 1,448 ft² · Sold $285K · Jun 2009
- 500 Union St$500K0 ft · 2 bd · 2 ba · 1,296 ft² · Sold $401K · Apr 2019
- 500 Union St$541K0 ft · 2 bd · 2 ba · 1,457 ft² · Sold $305K · Dec 2009
- 500 Union St$557K0 ft · 2 bd · 2 ba · 1,423 ft² · Sold $560K · May 2025
- 500 Union St$502K0 ft · 2 bd · 2 ba · 1,310 ft² · Sold $505K · Feb 2025
More homes in Westborough 01581
- 129 Milk St$510K3 bd · 1.5 ba · 1,008 ft² · Sold $510K · Aug 2026
- 6312 Peters Farm Way$589K2 bd · 2 ba · 1,469 ft² · Sold $540K · Aug 2026
- 1312 Codman Way$569K2 bd · 2 ba · 1,469 ft² · Sold $590K · Aug 2026
- 4 Quick Farm Rd$1.6M4 bd · 5 ba · 5,505 ft² · Sold $1.6M · Aug 2026
- 14 Boardman St$660K3 bd · 1.5 ba · 1,172 ft² · Sold $660K · Aug 2026
- 191 Ruggles St$1.3M4 bd · 4 ba · 3,637 ft² · Sold $1.3M · Aug 2026
- 11 Quick Farm Rd$1.7M4 bd · 4 ba · 3,424 ft² · Sold $1.6M · Aug 2026
- 29 Arch St$671K3 bd · 2.5 ba · 1,745 ft² · Sold $600K · Aug 2026
- 45 Summer St6 bd · 2 ba · 2,076 ft² · Sold $630K · Aug 2026
- 3 Oneil Dr$658K2 bd · 2 ba · 1,392 ft² · Sold $658K · Aug 2026
- 9 Ward Ln$785K4 bd · 2.5 ba · 1,684 ft² · Sold $612K · Aug 2026
- 272 W Main St$1.2M3 bd · 3.5 ba · 2,495 ft² · Sold $1.2M · Jul 2026
Assigned schools
Explore the area
See this home in context
Open 500 Union St on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.
Open in map