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Single Family ResidenceResidential
$1,136,770$1,041 / 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 90How 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

5121 KEYSTONE DR

FREMONT, CA 94536
3
Beds
2
Baths
1,092 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.
0.16 ac
Lot SizeThe size of the land the home sits on, from county records.
1954
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$1.1M
$1M low$1.3M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,822 (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.$264,819 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$153,334
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$118,485
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$259,491
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,260,810

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Custom Design
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.1955
Lot (acres)The size of the land the home sits on, from county records.0.16
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(2)

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
John G. Mattos Elementary SchoolA-
Elementary · Grades KG–5 · 0.2 mi
M
G. M. Walters Middle SchoolA
Middle · Grades 6–8 · 1.5 mi
H
Kennedy High SchoolB+
High · Grades 9–12 · 1.7 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

5121 Keystone Dr 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 92% of homes in Glenmoor
  • Costs more per square foot than 93% of homes in Alameda County
  • Smaller than 96% of homes in Glenmoor
  • Has a smaller lot than 71% of homes in Glenmoor
  • Older than 88% of homes in Fremont 94536

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
$436K$2.4M

This home is worth more than 33% 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$1,136,770
CheaperTypical $1,371,443Pricier

Pricier than 33% of homes nearby

Price per ft²$1041
CheaperTypical $857Pricier

Pricier than 91% of homes nearby

Living area1,092 ft²
SmallerTypical 1,534 ft²Bigger

Bigger than 15% of homes nearby

Lot size0.16 ac
SmallerTypical 0.14 acBigger

Bigger than 57% of homes nearby

Year built1954
OlderTypical 1971Newer

Newer than 12% of homes nearby

How 5121 Keystone Dr ranks against every home in each area.
MeasureThis homeGlenmoorFremont 94536Alameda County
Estimated valuepricier than$1,136,7708% of homes33% of homes55% of homes
Price per ft²pricier than$104185% of homes91% of homes93% of homes
Living areabigger than1,092 ft²4% of homes15% of homes18% of homes
Lot sizebigger than0.16 ac29% of homes57% of homes62% of homes
Year builtnewer than195417% of homes12% of homes37% of homes

About 5121 Keystone Dr

How much is 5121 Keystone Dr, Fremont, CA worth?

The TopHap Estimate for 5121 Keystone Dr, Fremont, CA is $1,136,770 as of Aug 30, 2026. The likely range is $1,017,820 to $1,255,720. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 5121 Keystone Dr, Fremont, CA last sell?

5121 Keystone Dr, Fremont, CA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 5121 Keystone Dr, Fremont, CA?

5121 Keystone Dr, Fremont, CA has 3 bedrooms, 2 bathrooms, 1,092 square feet of living space and a 0.16-acre lot.

When was 5121 Keystone Dr, Fremont, CA built?

5121 Keystone Dr, Fremont, CA was built in 1954, making it 72 years old. It is a custom design home. The building has 1 story.

What schools serve 5121 Keystone Dr, Fremont, CA?

5121 Keystone Dr, Fremont, CA is assigned to John G. Mattos Elementary School (elementary), rated A-; G. M. Walters Middle School (middle), rated A; Kennedy High School (high), rated B+. All sit in Fremont Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 5121 Keystone Dr, Fremont, CA compare to other homes in Fremont 94536?

Among the 18,769 homes in Fremont 94536, it is worth more than 33% of them ($1,136,770 against a typical $1,371,443), its price per square foot is higher than 91% of them ($1041 against a typical $857), it is bigger than 15% of them (1,092 ft² against a typical 1,534 ft²), its lot is bigger than 57% of them (0.16 ac against a typical 0.14 ac) and it is newer than 12% of them (1954 against a typical 1971). Measured against all of Alameda County, it is worth more than 55% 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 5121 Keystone Dr, Fremont, CA?

The 2025 property tax bill for 5121 Keystone Dr, Fremont, CA was $3,822. The county assessed it at $264,819.

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