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Multi-Family Dwellings (Generic, Any Combination)Residential
Last sold for $15,000,000 on Sep 1, 2023

3900 HORNER ST

UNION CITY, CA 94587
20
Beds
20
Baths
44,800 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.
2.54 ac
Lot SizeThe size of the land the home sits on, from county records.
1986
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
80
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$15,000,000 · Sep 1, 2023

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$233,373 (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.$15,605,088 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$4,993,920
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$10,580,868
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$15,299,700

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Multi-Family Dwellings (Generic, Any Combination)
CountyALAMEDA
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
GarageWhether the property has a garage, and details like whether it is attached to the home.Carport (Unspecified)
PoolWhether the property has a pool, and what kind, such as in-ground.Yes

Transaction History(11)

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
Alvarado Elementary SchoolB
Elementary · Grades KG–5 · 0.2 mi
M
Itliong-Vera Cruz Middle SchoolB+
Middle · Grades 6–8 · 0.2 mi
H
James Logan High SchoolB+
High · Grades 9–12 · 3.0 mi

District: New Haven Unified School District

Neighborhood · ZIP 94587These 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.43
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.87
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.552

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.98%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.30%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.66,162
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,241 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$129,537
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$155,780
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.19 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

3900 Horner 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.

  • Among the largest homes in Union City 94587
  • Has a bigger lot than 96% of homes in Union City 94587
  • Newer than 74% of homes in Alameda County

How it measures up in Union City 94587

The dot is this home. The mark in the middle is the typical home in Union City 94587.

Living area44,800 ft²
SmallerTypical 1,565 ft²Bigger

Bigger than almost all homes nearby

Lot size2.54 ac
SmallerTypical 0.14 acBigger

Bigger than 96% of homes nearby

Year built1986
OlderTypical 1977Newer

Newer than 71% of homes nearby

How 3900 Horner St ranks against every home in each area.
MeasureThis homeUnion City 94587Alameda County
Living areabigger than44,800 ft²almost all homesalmost all homes
Lot sizebigger than2.54 ac96% of homes96% of homes
Year builtnewer than198671% of homes74% of homes

About 3900 Horner St

When did 3900 Horner St, Union City, CA last sell?

3900 Horner St, Union City, CA last sold on Sep 1, 2023 for $15,000,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 3900 Horner St, Union City, CA?

3900 Horner St, Union City, CA has 20 bedrooms, 20 bathrooms and 44,800 square feet of living space.

When was 3900 Horner St, Union City, CA built?

3900 Horner St, Union City, CA was built in 1986, making it 40 years old. The building has 2 stories.

What schools serve 3900 Horner St, Union City, CA?

3900 Horner St, Union City, CA is assigned to Alvarado Elementary School (elementary), rated B; Itliong-Vera Cruz Middle School (middle), rated B+; James Logan High School (high), rated B+. All sit in New Haven Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 3900 Horner St, Union City, CA compare to other homes in Union City 94587?

Among the 17,568 homes in Union City 94587, it is bigger than almost all of them (44,800 ft² against a typical 1,565 ft²), its lot is bigger than 96% of them (2.54 ac against a typical 0.14 ac) and it is newer than 71% of them (1986 against a typical 1977). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 3900 Horner St, Union City, CA?

The 2025 property tax bill for 3900 Horner St, Union City, CA was $233,373. The county assessed it at $15,605,088.

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