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Single Family ResidenceResidential
$1,289,290$675 / 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 93How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026

640 CASSIA ST

REDWOOD CITY, CA 94063
3
Beds
2
Baths
1,910 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.
1893
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
8
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

$1.3M
$1.2M low$1.4M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,976 (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.$257,536 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$115,447
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$142,089
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$252,487
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$535,770

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.17 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.34%
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.0.2 percent flood zone

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountySAN MATEO
Lot (acres)The size of the land the home sits on, from county records.0.12
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(5)

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
Hoover Elementary SchoolC
Elementary · Grades KG–8 · 0.5 mi
H
Sequoia High SchoolB
High · Grades 9–12 · 0.7 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

640 Cassia St 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 more than 85% of homes in Stambaugh / Heller
  • Costs less per square foot than 96% of homes in Redwood City 94063
  • Bigger than 80% of homes in Redwood City 94063
  • Has a smaller lot than 82% of homes in Redwood City 94063
  • Among the oldest homes in Redwood City 94063

What homes are worth in Redwood City 94063

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

This home
$689K$2.2M

This home is worth more than 49% of homes in Redwood City 94063.

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.

Estimated value$1,289,290
CheaperTypical $1,297,833Pricier

Pricier than 49% of homes nearby

Price per ft²$675
CheaperTypical $1042Pricier

Pricier than 4% of homes nearby

Living area1,910 ft²
SmallerTypical 1,287 ft²Bigger

Bigger than 80% of homes nearby

Lot size0.11 ac
SmallerTypical 0.13 acBigger

Bigger than 18% of homes nearby

Year built1893
OlderTypical 1949Newer

Older than almost all homes nearby

How 640 Cassia St ranks against every home in each area.
MeasureThis homeStambaugh / HellerRedwood City 94063San Mateo County
Estimated valuepricier than$1,289,29085% of homes49% of homes41% of homes
Price per ft²pricier than$67518% of homes4% of homes14% of homes
Living areabigger than1,910 ft²60% of homes80% of homes64% of homes
Lot sizebigger than0.11 ac32% of homes18% of homes24% of homes
Year builtnewer than18936% of homesalmost no homesalmost no homes

About 640 Cassia St

How much is 640 Cassia St, Redwood City, CA worth?

The TopHap Estimate for 640 Cassia St, Redwood City, CA is $1,289,290 as of Aug 30, 2026. The likely range is $1,201,914 to $1,376,666. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 640 Cassia St, Redwood City, CA last sell?

640 Cassia St, Redwood City, CA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 640 Cassia St, Redwood City, CA?

640 Cassia St, Redwood City, CA has 3 bedrooms, 2 bathrooms, 1,910 square feet of living space and a 0.12-acre lot.

When was 640 Cassia St, Redwood City, CA built?

640 Cassia St, Redwood City, CA was built in 1893, making it 133 years old. The building has 2 stories.

What schools serve 640 Cassia St, Redwood City, CA?

640 Cassia St, Redwood City, CA is assigned to Hoover Elementary School (elementary), rated C; Sequoia High School (high), rated B. All sit in Sequoia Union High School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 640 Cassia St, Redwood City, CA compare to other homes in Redwood City 94063?

Among the 4,666 homes in Redwood City 94063, it is worth more than 49% of them ($1,289,290 against a typical $1,297,833), its price per square foot is higher than 4% of them ($675 against a typical $1042), it is bigger than 80% of them (1,910 ft² against a typical 1,287 ft²), its lot is bigger than 18% of them (0.11 ac against a typical 0.13 ac) and it is newer than almost none of them (1893 against a typical 1949). Measured against all of San Mateo County, it is worth more than 41% 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 640 Cassia St, Redwood City, CA?

The 2025 property tax bill for 640 Cassia St, Redwood City, CA was $3,976. The county assessed it at $257,536.

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