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Single Family ResidenceResidential
$1,597,112$1,151 / 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 94How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026
Last sold for $1,375,000 on Oct 6, 2022

4273 CASTANOS ST

FREMONT, CA 94536
4
Beds
2
Baths
1,387 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.
0.15 ac
Lot SizeThe size of the land the home sits on, from county records.
1967
Year BuiltThe year the home was originally built, according to county records.
1
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.

Valuation

$1.6M
$1.5M low$1.7M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,375,000 · Oct 6, 2022

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$17,489 (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.$1,452,150 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$437,745
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,021,405
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,423,550
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,211,850

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.38
35
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
36
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
25
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
34
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
62
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.1 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.1 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
CountyALAMEDA
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.1968
Lot (acres)The size of the land the home sits on, from county records.0.15
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(6)

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
Patterson Elementary SchoolA-
Elementary · Grades KG–5 · 0.2 mi
H
American High SchoolA+
High · Grades 9–12 · 0.6 mi
M
Thornton Middle SchoolA
Middle · Grades 6–8 · 0.9 mi

District: Fremont Unified School District

Neighborhood · ZIP 94536These 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.62
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.92
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.557

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.35%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.3%
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.70,570
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,640 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$140,289
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$170,557
Average tempThe average temperature here across a full year.59°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.78%

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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

4273 Castanos 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 81% of homes in Alameda County
  • Costs more per square foot than 97% of homes in Alameda County
  • Has a bigger lot than 66% of homes in Cabrillo
  • Newer than 75% of homes in Cabrillo

What homes are worth in Fremont 94536

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

This home
$441K$2.3M

This home is worth more than 71% of homes in Fremont 94536.

How it measures up in Fremont 94536

The dot is this home. The mark in the middle is the typical home in Fremont 94536.

Estimated value$1,597,112
CheaperTypical $1,359,665Pricier

Pricier than 71% of homes nearby

Price per ft²$1151
CheaperTypical $853Pricier

Pricier than 96% of homes nearby

Living area1,387 ft²
SmallerTypical 1,537 ft²Bigger

Bigger than 37% of homes nearby

Lot size0.15 ac
SmallerTypical 0.14 acBigger

Bigger than 52% of homes nearby

Year built1967
OlderTypical 1971Newer

Newer than 43% of homes nearby

How 4273 Castanos St ranks against every home in each area.
MeasureThis homeCabrilloFremont 94536Alameda County
Estimated valuepricier than$1,597,11274% of homes71% of homes81% of homes
Price per ft²pricier than$115188% of homes96% of homes97% of homes
Living areabigger than1,387 ft²51% of homes37% of homes38% of homes
Lot sizebigger than0.15 ac66% of homes52% of homes57% of homes
Year builtnewer than196775% of homes43% of homes54% of homes

About 4273 Castanos St

How much is 4273 Castanos St, Fremont, CA worth?

The TopHap Estimate for 4273 Castanos St, Fremont, CA is $1,597,112 as of Jul 14, 2026. The likely range is $1,501,801 to $1,692,423. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 4273 Castanos St, Fremont, CA last sell?

4273 Castanos St, Fremont, CA last sold on Oct 6, 2022 for $1,375,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 4273 Castanos St, Fremont, CA?

4273 Castanos St, Fremont, CA has 4 bedrooms, 2 bathrooms, 1,387 square feet of living space and a 0.15-acre lot.

When was 4273 Castanos St, Fremont, CA built?

4273 Castanos St, Fremont, CA was built in 1967, making it 59 years old. The building has 1 story.

What schools serve 4273 Castanos St, Fremont, CA?

4273 Castanos St, Fremont, CA is assigned to Patterson Elementary School (elementary), rated A-; American High School (high), rated A+; Thornton Middle School (middle), rated A. All sit in Fremont Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 4273 Castanos St, Fremont, CA compare to other homes in Fremont 94536?

Among the 18,778 homes in Fremont 94536, it is worth more than 71% of them ($1,597,112 against a typical $1,359,665), its price per square foot is higher than 96% of them ($1151 against a typical $853), it is bigger than 37% of them (1,387 ft² against a typical 1,537 ft²), its lot is bigger than 52% of them (0.15 ac against a typical 0.14 ac) and it is newer than 43% of them (1967 against a typical 1971). Measured against all of Alameda County, it is worth more than 81% 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 4273 Castanos St, Fremont, CA?

The 2025 property tax bill for 4273 Castanos St, Fremont, CA was $17,489. The county assessed it at $1,452,150.

More homes on Castanos St

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