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Single Family ResidenceResidential
$1,216,431$784 / 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 Aug 30, 2026
Last sold for $249,500 on Dec 31, 1996

1870 SLATE DR

UNION CITY, CA 94587
3
Beds
2.5
Baths
1,551 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.
4,149 ft²
Lot SizeThe size of the land the home sits on, from county records.
1997
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
7
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

$1.2M
$1.1M low$1.3M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$249,500 · Dec 31, 1996

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,606 (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.$413,961 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$123,258
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$290,703
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$405,844
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,130,130

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyALAMEDA
Lot (acres)The size of the land the home sits on, from county records.0.10
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(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.

H
James Logan High SchoolA-
High · Grades 9–12 · 0.6 mi
E
Guy Emanuele Elementary SchoolB+
Elementary · Grades KG–5 · 0.9 mi
M
Cesar Chavez Middle SchoolC-
Middle · Grades 6–8 · 1.8 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

1870 Slate 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.

  • Costs more per square foot than 71% of homes in Alameda County
  • Has a smaller lot than 87% of homes in Union City 94587
  • Newer than 85% of homes in Alameda County

What homes are worth in Union City 94587

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

This home
$496K$2.4M

This home is worth more than 44% of homes in Union City 94587.

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.

Estimated value$1,216,431
CheaperTypical $1,264,687Pricier

Pricier than 44% of homes nearby

Price per ft²$784
CheaperTypical $738Pricier

Pricier than 62% of homes nearby

Living area1,551 ft²
SmallerTypical 1,566 ft²Bigger

Bigger than 48% of homes nearby

Lot size4,149 ft²
SmallerTypical 0.14 acBigger

Bigger than 13% of homes nearby

Year built1997
OlderTypical 1977Newer

Newer than 83% of homes nearby

How 1870 Slate Dr ranks against every home in each area.
MeasureThis homeUnion City 94587Alameda County
Estimated valuepricier than$1,216,43144% of homes60% of homes
Price per ft²pricier than$78462% of homes71% of homes
Living areabigger than1,551 ft²48% of homes49% of homes
Lot sizebigger than4,149 ft²13% of homes21% of homes
Year builtnewer than199783% of homes85% of homes

About 1870 Slate Dr

How much is 1870 Slate Dr, Union City, CA worth?

The TopHap Estimate for 1870 Slate Dr, Union City, CA is $1,216,431 as of Aug 30, 2026. The likely range is $1,147,045 to $1,285,817. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 1870 Slate Dr, Union City, CA last sell?

1870 Slate Dr, Union City, CA last sold on Dec 31, 1996 for $249,500, according to the county's recorded deed.

How big is 1870 Slate Dr, Union City, CA?

1870 Slate Dr, Union City, CA has 3 bedrooms, 2.5 bathrooms, 1,551 square feet of living space and a 0.10-acre lot.

When was 1870 Slate Dr, Union City, CA built?

1870 Slate Dr, Union City, CA was built in 1997, making it 29 years old. The building has 2 stories.

What schools serve 1870 Slate Dr, Union City, CA?

1870 Slate Dr, Union City, CA is assigned to James Logan High School (high), rated A-; Guy Emanuele Elementary School (elementary), rated B+; Cesar Chavez Middle School (middle), rated C-. All sit in New Haven Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 1870 Slate Dr, Union City, CA compare to other homes in Union City 94587?

Among the 17,563 homes in Union City 94587, it is worth more than 44% of them ($1,216,431 against a typical $1,264,687), its price per square foot is higher than 62% of them ($784 against a typical $738), it is bigger than 48% of them (1,551 ft² against a typical 1,566 ft²), its lot is bigger than 13% of them (4,149 ft² against a typical 0.14 ac) and it is newer than 83% of them (1997 against a typical 1977). Measured against all of Alameda County, it is worth more than 60% 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 1870 Slate Dr, Union City, CA?

The 2025 property tax bill for 1870 Slate Dr, Union City, CA was $6,606. The county assessed it at $413,961.

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