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TownhouseResidential
$620,298$239 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 96How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $565,000 on Sep 18, 2023

21825 FORMOSA SQ

STERLING, VA 20164
3
Beds
3.5
Baths
2,593 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.
1,742 ft²
Lot SizeThe size of the land the home sits on, from county records.
1991
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$620K
$593K low$648K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$565,000 · Sep 18, 2023

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,597 (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.$571,090 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$165,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$406,090
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$567,950
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$571,090

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.39
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
4
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
78
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
78
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
34
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.Townhouse
StyleThe architectural style of the home, such as ranch or colonial.Townhouse
CountyLOUDOUN
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.2001
Lot (acres)The size of the land the home sits on, from county records.0.04
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(4)

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

Foreclosure Filings(1)

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

E
Rolling Ridge Elementary SchoolD
Elementary · Grades PK–5 · 0.3 mi
H
Park View High SchoolF
High · Grades 9–12 · 1.0 mi
M
Sterling Middle SchoolF
Middle · Grades 6–8 · 1.4 mi

District: Loudoun County Public Schools

Neighborhood · ZIP 20164These 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.108
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.82
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.39

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.98%
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.8.9%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.0%
PopulationHow many people live in this area.44,608
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,821 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$120,134
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$148,041
Average tempThe average temperature here across a full year.54°F
Annual precipHow much rain and melted snow falls here in a typical year.43 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.63%

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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

21825 Formosa Sq 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.

  • Worth less than 74% of homes in Loudoun County
  • Costs less per square foot than 97% of homes in Sterling 20164
  • Bigger than 90% of homes in Sterling 20164
  • Among the smallest lots in Sterling 20164
  • Newer than 82% of homes in Sterling 20164

What homes are worth in Sterling 20164

Each bar is how many homes fall in that price range. The marker is this home.

This home
$308K$951K

This home is worth more than 61% of homes in Sterling 20164.

How it measures up in Sterling 20164

The dot is this home. The mark in the middle is the typical home in Sterling 20164.

Estimated value$620,298
CheaperTypical $589,028Pricier

Pricier than 61% of homes nearby

Price per ft²$239
CheaperTypical $324Pricier

Pricier than 3% of homes nearby

Living area2,593 ft²
SmallerTypical 1,732 ft²Bigger

Bigger than 90% of homes nearby

Lot size1,742 ft²
SmallerTypical 0.19 acBigger

Smaller than almost all homes nearby

Year built1991
OlderTypical 1977Newer

Newer than 82% of homes nearby

How 21825 Formosa Sq ranks against every home in each area.
MeasureThis homeSterling 20164Loudoun County
Estimated valuepricier than$620,29861% of homes26% of homes
Price per ft²pricier than$2393% of homes11% of homes
Living areabigger than2,593 ft²90% of homes47% of homes
Lot sizebigger than1,742 ft²almost no homes3% of homes
Year builtnewer than199182% of homes22% of homes

About 21825 Formosa Sq

How much is 21825 Formosa Sq, Sterling, VA worth?

The TopHap Estimate for 21825 Formosa Sq, Sterling, VA is $620,298 as of Sep 24, 2026. The likely range is $593,005 to $647,591. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21825 Formosa Sq, Sterling, VA last sell?

21825 Formosa Sq, Sterling, VA last sold on Sep 18, 2023 for $565,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 21825 Formosa Sq, Sterling, VA?

21825 Formosa Sq, Sterling, VA has 3 bedrooms, 3.5 bathrooms, 2,593 square feet of living space and a 0.04-acre lot.

When was 21825 Formosa Sq, Sterling, VA built?

21825 Formosa Sq, Sterling, VA was built in 1991, making it 35 years old. It is a townhouse home. The building has 2 stories.

What schools serve 21825 Formosa Sq, Sterling, VA?

21825 Formosa Sq, Sterling, VA is assigned to Rolling Ridge Elementary School (elementary), rated D; Park View High School (high), rated F; Sterling Middle School (middle), rated F. All sit in Loudoun County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21825 Formosa Sq, Sterling, VA compare to other homes in Sterling 20164?

Among the 12,131 homes in Sterling 20164, it is worth more than 61% of them ($620,298 against a typical $589,028), its price per square foot is higher than 3% of them ($239 against a typical $324), it is bigger than 90% of them (2,593 ft² against a typical 1,732 ft²), its lot is bigger than almost none of them (1,742 ft² against a typical 0.19 ac) and it is newer than 82% of them (1991 against a typical 1977). Measured against all of Loudoun County, it is worth more than 26% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 21825 Formosa Sq, Sterling, VA?

The 2026 property tax bill for 21825 Formosa Sq, Sterling, VA was $4,597. The county assessed it at $571,090.

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