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Single Family ResidenceResidential
$3,870,862$702 / 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 95How 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 $388,500 on May 27, 2021

891 UNION ST

ALAMEDA, CA 94501
6
Beds
5.5
Baths
5,514 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.
0.34 ac
Lot SizeThe size of the land the home sits on, from county records.
1896
Year BuiltThe year the home was originally built, according to county records.
3
StoriesHow many floors the home has above ground.
15
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$3.9M
$3.7M low$4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$388,500 · May 27, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$46,210 (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.$3,476,309 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,219,158
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$2,264,151
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$3,408,034
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$3,286,620

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.1913
Lot (acres)The size of the land the home sits on, from county records.0.34
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Builtup (layered Asphalt)
HeatingThe type of heating system in the home.Steam
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(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
Franklin Elementary SchoolA
Elementary · Grades KG–5 · 0.3 mi
M
Wood Middle SchoolB
Middle · Grades 6–8 · 0.3 mi
H
Encinal Jr. & Sr. High School SchoolB+
High · Grades 6–12 · 1.7 mi

District: Alameda City Unified School District

Neighborhood · ZIP 94501These 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.124
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.88
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.409

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.93%
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.8.8%
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.61,491
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,332 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$122,273
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$153,309
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.20 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

891 Union 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 most valuable homes in Bronze Coast
  • Among the largest homes in Alameda County
  • Has a bigger lot than 86% of homes in Alameda 94501
  • Among the oldest homes in Alameda County

What homes are worth in Alameda 94501

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

This home
$408K$2.2M

This home is worth more than almost all homes in Alameda 94501.

How it measures up in Alameda 94501

The dot is this home. The mark in the middle is the typical home in Alameda 94501.

Estimated value$3,870,862
CheaperTypical $1,113,009Pricier

Pricier than almost all homes nearby

Price per ft²$702
CheaperTypical $718Pricier

Pricier than 46% of homes nearby

Living area5,514 ft²
SmallerTypical 1,654 ft²Bigger

Bigger than 98% of homes nearby

Lot size0.34 ac
SmallerTypical 0.11 acBigger

Bigger than 86% of homes nearby

Year built1896
OlderTypical 1933Newer

Newer than 9% of homes nearby

How 891 Union St ranks against every home in each area.
MeasureThis homeBronze CoastAlameda 94501Alameda County
Estimated valuepricier than$3,870,862almost all homesalmost all homesalmost all homes
Price per ft²pricier than$70264% of homes46% of homes58% of homes
Living areabigger than5,514 ft²96% of homes98% of homesalmost all homes
Lot sizebigger than0.34 ac79% of homes86% of homes86% of homes
Year builtnewer than189618% of homes9% of homesalmost no homes

About 891 Union St

How much is 891 Union St, Alameda, CA worth?

The TopHap Estimate for 891 Union St, Alameda, CA is $3,870,862 as of Jul 14, 2026. The likely range is $3,693,581 to $4,048,144. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 891 Union St, Alameda, CA last sell?

891 Union St, Alameda, CA last sold on May 27, 2021 for $388,500, according to the county's recorded deed. TopHap holds 5 recorded sales for this parcel.

How big is 891 Union St, Alameda, CA?

891 Union St, Alameda, CA has 6 bedrooms, 5.5 bathrooms, 5,514 square feet of living space and a 0.34-acre lot.

When was 891 Union St, Alameda, CA built?

891 Union St, Alameda, CA was built in 1896, making it 130 years old. It is a custom design home. The building has 3 stories.

What schools serve 891 Union St, Alameda, CA?

891 Union St, Alameda, CA is assigned to Franklin Elementary School (elementary), rated A; Wood Middle School (middle), rated B; Encinal Jr. & Sr. High School School (high), rated B+. All sit in Alameda City Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 891 Union St, Alameda, CA compare to other homes in Alameda 94501?

Among the 14,878 homes in Alameda 94501, it is worth more than almost all of them ($3,870,862 against a typical $1,113,009), its price per square foot is higher than 46% of them ($702 against a typical $718), it is bigger than 98% of them (5,514 ft² against a typical 1,654 ft²), its lot is bigger than 86% of them (0.34 ac against a typical 0.11 ac) and it is newer than 9% of them (1896 against a typical 1933). Measured against all of Alameda County, it is worth more than almost all 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 891 Union St, Alameda, CA?

The 2025 property tax bill for 891 Union St, Alameda, CA was $46,210. The county assessed it at $3,476,309.

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