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Single Family ResidenceResidential
$2,242,196
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 88How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026

BLACKSTONE CT

CASTRO VALLEY, CA 94542
0
Baths
1,438 ft²
Lot SizeThe size of the land the home sits on, from county records.

Valuation

$2.2M
$2M low$2.5M high

Tax & Assessment

Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,019,160

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.0.03
PoolWhether the property has a pool, and what kind, such as in-ground.No

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Fairview Elementary SchoolD-
Elementary · Grades KG–6 · 0.8 mi
H
Hayward High SchoolC
High · Grades 9–12 · 1.7 mi
M
Bret Harte Middle SchoolC-
Middle · Grades 7–8 · 2.2 mi

District: Hayward Unified School District

Neighborhood · ZIP 94542These 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.63
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.91
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.725

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.30%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.9%
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.13,844
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,518 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$126,651
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$163,268
Average tempThe average temperature here across a full year.57°F
Annual precipHow much rain and melted snow falls here in a typical year.25 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

Blackstone Ct 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 Castro Valley
  • Among the smallest lots in Hayward 94542

What homes are worth in Hayward 94542

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

This home
$500K$2.7M

This home is worth more than 91% of homes in Hayward 94542.

How it measures up in Hayward 94542

The dot is this home. The mark in the middle is the typical home in Hayward 94542.

Estimated value$2,242,196
CheaperTypical $1,242,412Pricier

Pricier than 91% of homes nearby

Lot size1,438 ft²
SmallerTypical 0.21 acBigger

Smaller than almost all homes nearby

How Blackstone Ct ranks against every home in each area.
MeasureThis homeCastro ValleyHayward 94542Alameda County
Estimated valuepricier than$2,242,196almost all homes91% of homes93% of homes
Lot sizebigger than1,438 ft²2% of homesalmost no homes2% of homes

About Blackstone Ct

How much is Blackstone Ct, Castro Valley, CA worth?

The TopHap Estimate for Blackstone Ct, Castro Valley, CA is $2,242,196 as of Sep 24, 2026. The likely range is $1,972,492 to $2,511,900. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did Blackstone Ct, Castro Valley, CA last sell?

Blackstone Ct, Castro Valley, CA last sold on Jan 1, 1900, according to the county's recorded deed.

What schools serve Blackstone Ct, Castro Valley, CA?

Blackstone Ct, Castro Valley, CA is assigned to Fairview Elementary School (elementary), rated D-; Hayward High School (high), rated C; Bret Harte Middle School (middle), rated C-. All sit in Hayward Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does Blackstone Ct, Castro Valley, CA compare to other homes in Hayward 94542?

Among the 4,392 homes in Hayward 94542, it is worth more than 91% of them ($2,242,196 against a typical $1,242,412) and its lot is bigger than almost none of them (1,438 ft² against a typical 0.21 ac). Measured against all of Alameda County, it is worth more than 93% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

More homes on Blackstone Ct

Closest homes

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Assigned schools

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