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Duplex (2 Units, Any Combination)Residential

509 DOUGLAS AVE

REDWOOD CITY, CA 94063
2
Beds
2
Baths
2,294 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.
0.11 ac
Lot SizeThe size of the land the home sits on, from county records.
1950
Year BuiltThe year the home was originally built, according to county records.
2
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.
3
ParkingThe number of parking spaces on the property, including the garage.

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,454 (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.$98,538 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$17,503
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$81,035
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$96,607

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.7 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.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
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(3)

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
Taft Elementary SchoolD-
Elementary · Grades KG–5 · 1.0 mi
H
Sequoia High SchoolB
High · Grades 9–12 · 1.4 mi
M
John F. Kennedy Middle SchoolB-
Middle · Grades 6–8 · 1.9 mi

District: Sequoia Union High School District

Neighborhood · ZIP 94063These 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.111
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.89
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.462

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.92%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.20%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.12%
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.34,095
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,580 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$105,296
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$143,498
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.18 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

509 Douglas Ave 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.

  • Bigger than 87% of homes in Redwood City 94063
  • Has a smaller lot than 82% of homes in Redwood City 94063
  • Older than 71% of homes in San Mateo County

How it measures up in Redwood City 94063

The dot is this home. The mark in the middle is the typical home in Redwood City 94063.

Living area2,294 ft²
SmallerTypical 1,288 ft²Bigger

Bigger than 87% of homes nearby

Lot size0.11 ac
SmallerTypical 0.13 acBigger

Bigger than 18% of homes nearby

Year built1950
OlderTypical 1949Newer

Newer than 56% of homes nearby

How 509 Douglas Ave ranks against every home in each area.
MeasureThis homeRedwood City 94063San Mateo County
Living areabigger than2,294 ft²87% of homes77% of homes
Lot sizebigger than0.11 ac18% of homes24% of homes
Year builtnewer than195056% of homes29% of homes

About 509 Douglas Ave

When did 509 Douglas Ave, Redwood City, CA last sell?

509 Douglas Ave, Redwood City, CA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 509 Douglas Ave, Redwood City, CA?

509 Douglas Ave, Redwood City, CA has 2 bedrooms, 2 bathrooms, 2,294 square feet of living space and a 0.12-acre lot.

When was 509 Douglas Ave, Redwood City, CA built?

509 Douglas Ave, Redwood City, CA was built in 1950, making it 76 years old. It is a duplex single home. The building has 2 stories.

What schools serve 509 Douglas Ave, Redwood City, CA?

509 Douglas Ave, Redwood City, CA is assigned to Taft Elementary School (elementary), rated D-; Sequoia High School (high), rated B; John F. Kennedy Middle School (middle), rated B-. All sit in Sequoia Union High School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 509 Douglas Ave, Redwood City, CA compare to other homes in Redwood City 94063?

Among the 4,666 homes in Redwood City 94063, it is bigger than 87% of them (2,294 ft² against a typical 1,288 ft²), its lot is bigger than 18% of them (0.11 ac against a typical 0.13 ac) and it is newer than 56% of them (1950 against a typical 1949). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 509 Douglas Ave, Redwood City, CA?

The 2025 property tax bill for 509 Douglas Ave, Redwood City, CA was $3,454. The county assessed it at $98,538.

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