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Single Family ResidenceResidential
$1,238,820$628 / 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 83How 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 $900,000 on Mar 19, 2015

109 DIAPIAN BAY

ALAMEDA, CA 94502
3
Beds
2.5
Baths
1,972 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.
2,480 ft²
Lot SizeThe size of the land the home sits on, from county records.
1991
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.

Valuation

$1.2M
$1M low$1.4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$900,000 · Mar 19, 2015

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$15,458 (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.$1,103,255 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$330,976
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$772,279
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,081,628
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,348,200

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.6 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
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.0.2 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
Lot (acres)The size of the land the home sits on, from county records.0.06
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(5)

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
Bay Farm SchoolA
Elementary · Grades KG–8 · 0.3 mi
H
Alameda High SchoolA+
High · Grades 9–12 · 1.7 mi

District: Alameda City Unified School District

Neighborhood · ZIP 94502These 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.90
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.379

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.45%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.8%
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.15,069
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,016 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$164,486
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$194,499
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

109 Diapian Bay 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 67% of homes in Alameda 94502
  • Bigger than 70% of homes in Alameda County
  • Has a smaller lot than 94% of homes in Alameda County
  • Newer than 88% of homes in Harbor Bay Isle

What homes are worth in Alameda 94502

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

This home
$643K$2.2M

This home is worth more than 67% of homes in Alameda 94502.

How it measures up in Alameda 94502

The dot is this home. The mark in the middle is the typical home in Alameda 94502.

Estimated value$1,238,820
CheaperTypical $1,065,200Pricier

Pricier than 67% of homes nearby

Price per ft²$628
CheaperTypical $617Pricier

Pricier than 55% of homes nearby

Living area1,972 ft²
SmallerTypical 1,701 ft²Bigger

Bigger than 66% of homes nearby

Lot size2,480 ft²
SmallerTypical 4,008 ft²Bigger

Bigger than 34% of homes nearby

Year built1991
OlderTypical 1984Newer

Newer than 88% of homes nearby

How 109 Diapian Bay ranks against every home in each area.
MeasureThis homeHarbor Bay IsleAlameda 94502Alameda County
Estimated valuepricier than$1,238,82044% of homes67% of homes62% of homes
Price per ft²pricier than$62849% of homes55% of homes43% of homes
Living areabigger than1,972 ft²44% of homes66% of homes70% of homes
Lot sizebigger than2,480 ft²16% of homes34% of homes6% of homes
Year builtnewer than199188% of homes88% of homes80% of homes

About 109 Diapian Bay

How much is 109 Diapian Bay, Alameda, CA worth?

The TopHap Estimate for 109 Diapian Bay, Alameda, CA is $1,238,820 as of Aug 30, 2026. The likely range is $1,029,797 to $1,447,843. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 109 Diapian Bay, Alameda, CA last sell?

109 Diapian Bay, Alameda, CA last sold on Mar 19, 2015 for $900,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 109 Diapian Bay, Alameda, CA?

109 Diapian Bay, Alameda, CA has 3 bedrooms, 2.5 bathrooms, 1,972 square feet of living space and a 0.06-acre lot.

When was 109 Diapian Bay, Alameda, CA built?

109 Diapian Bay, Alameda, CA was built in 1991, making it 35 years old. The building has 2 stories.

What schools serve 109 Diapian Bay, Alameda, CA?

109 Diapian Bay, Alameda, CA is assigned to Bay Farm School (elementary), rated A; Alameda High School (high), rated A+. All sit in Alameda City Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 109 Diapian Bay, Alameda, CA compare to other homes in Alameda 94502?

Among the 5,176 homes in Alameda 94502, it is worth more than 67% of them ($1,238,820 against a typical $1,065,200), its price per square foot is higher than 55% of them ($628 against a typical $617), it is bigger than 66% of them (1,972 ft² against a typical 1,701 ft²), its lot is bigger than 34% of them (2,480 ft² against a typical 4,008 ft²) and it is newer than 88% of them (1991 against a typical 1984). Measured against all of Alameda County, it is worth more than 62% 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 109 Diapian Bay, Alameda, CA?

The 2025 property tax bill for 109 Diapian Bay, Alameda, CA was $15,458. The county assessed it at $1,103,255.

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