Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$655,454$635 / 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 93How 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 $165,000 on Feb 16, 1999

17270 ROBERTO ST

CASTRO VALLEY, CA 94546
2
Beds
1
Baths
1,032 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.
0.16 ac
Lot SizeThe size of the land the home sits on, from county records.
1938
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
4
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$655K
$608K low$703K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$165,000 · Feb 16, 1999
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$490,454
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$392,363
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.25%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$165,000
LARSEN LOREN L & S A TRUST · recorded Oct 1, 2012

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,871 (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.$256,829 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$79,948
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$183,881
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$251,657
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$595,440

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.0.16
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.

M
Edendale Middle SchoolF
Middle · Grades 6–8 · 1.0 mi
H
San Lorenzo High SchoolC-
High · Grades 9–12 · 1.3 mi
E
Corvallis Elementary SchoolC
Elementary · Grades KG–5 · 2.9 mi

District: San Lorenzo Unified School District

Neighborhood · ZIP 94546These 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.78
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 100.657

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.27%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.9%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.46,776
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,466 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$117,352
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$142,642
Average tempThe average temperature here across a full year.57°F
Annual precipHow much rain and melted snow falls here in a typical year.23 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.78%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
Company ownedWhether the owner is a company or trust rather than a person.No

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

17270 Roberto 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.

  • Worth less than 95% of homes in Castro Valley
  • Smaller than 92% of homes in Castro Valley
  • Older than 97% of homes in Castro Valley

What homes are worth in Castro Valley 94546

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

This home
$450K$1.7M

This home is worth more than 9% of homes in Castro Valley 94546.

How it measures up in Castro Valley 94546

The dot is this home. The mark in the middle is the typical home in Castro Valley 94546.

Estimated value$655,454
CheaperTypical $971,847Pricier

Pricier than 9% of homes nearby

Price per ft²$635
CheaperTypical $625Pricier

Pricier than 54% of homes nearby

Living area1,032 ft²
SmallerTypical 1,545 ft²Bigger

Bigger than 10% of homes nearby

Lot size0.16 ac
SmallerTypical 0.16 acBigger

Bigger than 53% of homes nearby

Year built1938
OlderTypical 1955Newer

Newer than 3% of homes nearby

How 17270 Roberto St ranks against every home in each area.
MeasureThis homeCastro ValleyCastro Valley 94546Alameda County
Estimated valuepricier than$655,4545% of homes9% of homes19% of homes
Price per ft²pricier than$63551% of homes54% of homes44% of homes
Living areabigger than1,032 ft²8% of homes10% of homes14% of homes
Lot sizebigger than0.16 ac56% of homes53% of homes63% of homes
Year builtnewer than19383% of homes3% of homes22% of homes

About 17270 Roberto St

How much is 17270 Roberto St, Castro Valley, CA worth?

The TopHap Estimate for 17270 Roberto St, Castro Valley, CA is $655,454 as of Jul 14, 2026. The likely range is $607,631 to $703,277. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 17270 Roberto St, Castro Valley, CA last sell?

17270 Roberto St, Castro Valley, CA last sold on Feb 16, 1999 for $165,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 17270 Roberto St, Castro Valley, CA?

17270 Roberto St, Castro Valley, CA has 2 bedrooms, 1 bathrooms, 1,032 square feet of living space and a 0.16-acre lot.

When was 17270 Roberto St, Castro Valley, CA built?

17270 Roberto St, Castro Valley, CA was built in 1938, making it 88 years old. The building has 1 story.

What schools serve 17270 Roberto St, Castro Valley, CA?

17270 Roberto St, Castro Valley, CA is assigned to Edendale Middle School (middle), rated F; San Lorenzo High School (high), rated C-; Corvallis Elementary School (elementary), rated C. All sit in San Lorenzo Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 17270 Roberto St, Castro Valley, CA compare to other homes in Castro Valley 94546?

Among the 13,493 homes in Castro Valley 94546, it is worth more than 9% of them ($655,454 against a typical $971,847), its price per square foot is higher than 54% of them ($635 against a typical $625), it is bigger than 10% of them (1,032 ft² against a typical 1,545 ft²), its lot is bigger than 53% of them (0.16 ac against a typical 0.16 ac) and it is newer than 3% of them (1938 against a typical 1955). Measured against all of Alameda County, it is worth more than 19% 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 17270 Roberto St, Castro Valley, CA?

The 2025 property tax bill for 17270 Roberto St, Castro Valley, CA was $3,871. The county assessed it at $256,829.

Closest homes

More homes in Castro Valley 94546

Assigned schools

Explore the area

See this home in context

Open 17270 Roberto St on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map