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Duplex (2 Units, Any Combination)Residential
Last sold for $390,000 on Sep 22, 1998

21 GARDEN LN

SAN MATEO, CA 94403
2
Beds
2
Baths
1,100 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.
0.12 ac
Lot SizeThe size of the land the home sits on, from county records.
1947
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$390,000 · Sep 22, 1998

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,427 (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.$623,612 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$187,077
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$436,535
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$611,385

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.Duplex Single
CountySAN MATEO
Lot (acres)The size of the land the home sits on, from county records.0.12
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.

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

E
Laurel Elementary SchoolD
Elementary · Grades KG–5 · 0.4 mi
M
Abbott Middle SchoolC
Middle · Grades 6–8 · 0.8 mi
H
Hillsdale High SchoolA-
High · Grades 9–12 · 0.9 mi

District: San Mateo-Foster City Elementary School District

Neighborhood · ZIP 94403These 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.104
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.85
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.516

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.7.9%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.43,216
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.7,529 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$160,514
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$196,016
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.21 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.66%

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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

21 Garden Ln 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.

  • Smaller than 91% of homes in Westwood Knolls
  • Has a smaller lot than 89% of homes in Westwood Knolls
  • Older than 83% of homes in San Mateo 94403

How it measures up in San Mateo 94403

The dot is this home. The mark in the middle is the typical home in San Mateo 94403.

Living area1,100 ft²
SmallerTypical 1,530 ft²Bigger

Bigger than 18% of homes nearby

Lot size0.12 ac
SmallerTypical 0.14 acBigger

Bigger than 22% of homes nearby

Year built1947
OlderTypical 1955Newer

Newer than 17% of homes nearby

How 21 Garden Ln ranks against every home in each area.
MeasureThis homeWestwood KnollsSan Mateo 94403San Mateo County
Living areabigger than1,100 ft²9% of homes18% of homes18% of homes
Lot sizebigger than0.12 ac11% of homes22% of homes31% of homes
Year builtnewer than194744% of homes17% of homes20% of homes

About 21 Garden Ln

When did 21 Garden Ln, San Mateo, CA last sell?

21 Garden Ln, San Mateo, CA last sold on Sep 22, 1998 for $390,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 21 Garden Ln, San Mateo, CA?

21 Garden Ln, San Mateo, CA has 2 bedrooms, 2 bathrooms, 1,100 square feet of living space and a 0.12-acre lot.

When was 21 Garden Ln, San Mateo, CA built?

21 Garden Ln, San Mateo, CA was built in 1947, making it 79 years old. It is a duplex single home. The building has 1 story.

What schools serve 21 Garden Ln, San Mateo, CA?

21 Garden Ln, San Mateo, CA is assigned to Laurel Elementary School (elementary), rated D; Abbott Middle School (middle), rated C; Hillsdale High School (high), rated A-. All sit in San Mateo-Foster City Elementary School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Garden Ln, San Mateo, CA compare to other homes in San Mateo 94403?

Among the 11,698 homes in San Mateo 94403, it is bigger than 18% of them (1,100 ft² against a typical 1,530 ft²), its lot is bigger than 22% of them (0.12 ac against a typical 0.14 ac) and it is newer than 17% of them (1947 against a typical 1955). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 21 Garden Ln, San Mateo, CA?

The 2025 property tax bill for 21 Garden Ln, San Mateo, CA was $9,427. The county assessed it at $623,612.

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Assigned schools

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