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Single Family ResidenceResidential
$745,144$657 / 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 96How 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

17666 VIA ROSAS

SAN LORENZO, CA 94580
3
Beds
1
Baths
1,134 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.
0.13 ac
Lot SizeThe size of the land the home sits on, from county records.
1947
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$745K
$712K low$778K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,055 (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.$83,605 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$49,771
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$33,834
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$81,966
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$563,310

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
Lot (acres)The size of the land the home sits on, from county records.0.14
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(2)

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
Bohannon Middle SchoolC-
Middle · Grades 6–8 · 0.2 mi
E
Del Rey Elementary SchoolC+
Elementary · Grades KG–5 · 0.8 mi
H
Arroyo High SchoolB+
High · Grades 9–12 · 1.0 mi

District: San Lorenzo Unified School District

Neighborhood · ZIP 94580These 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.45
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.89
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.582

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.23%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.8%
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.28,849
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.8,205 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$97,479
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$130,534
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

17666 Via Rosas 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 73% of homes in Alameda County
  • Costs more per square foot than 78% of homes in San Lorenzo 94580
  • Smaller than 79% of homes in Alameda County
  • Has a bigger lot than 72% of homes in San Lorenzo 94580
  • Older than 72% of homes in San Lorenzo 94580

What homes are worth in San Lorenzo 94580

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

This home
$486K$997K

This home is worth more than 46% of homes in San Lorenzo 94580.

How it measures up in San Lorenzo 94580

The dot is this home. The mark in the middle is the typical home in San Lorenzo 94580.

Estimated value$745,144
CheaperTypical $754,891Pricier

Pricier than 46% of homes nearby

Price per ft²$657
CheaperTypical $571Pricier

Pricier than 78% of homes nearby

Living area1,134 ft²
SmallerTypical 1,291 ft²Bigger

Bigger than 36% of homes nearby

Lot size0.13 ac
SmallerTypical 0.12 acBigger

Bigger than 72% of homes nearby

Year built1947
OlderTypical 1951Newer

Newer than 28% of homes nearby

How 17666 Via Rosas ranks against every home in each area.
MeasureThis homeSan Lorenzo 94580Alameda County
Estimated valuepricier than$745,14446% of homes27% of homes
Price per ft²pricier than$65778% of homes49% of homes
Living areabigger than1,134 ft²36% of homes21% of homes
Lot sizebigger than0.13 ac72% of homes47% of homes
Year builtnewer than194728% of homes28% of homes

About 17666 Via Rosas

How much is 17666 Via Rosas, San Lorenzo, CA worth?

The TopHap Estimate for 17666 Via Rosas, San Lorenzo, CA is $745,144 as of Aug 30, 2026. The likely range is $711,813 to $778,475. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 17666 Via Rosas, San Lorenzo, CA last sell?

17666 Via Rosas, San Lorenzo, CA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 17666 Via Rosas, San Lorenzo, CA?

17666 Via Rosas, San Lorenzo, CA has 3 bedrooms, 1 bathrooms, 1,134 square feet of living space and a 0.14-acre lot.

When was 17666 Via Rosas, San Lorenzo, CA built?

17666 Via Rosas, San Lorenzo, CA was built in 1947, making it 79 years old. It is a custom design home. The building has 1 story.

What schools serve 17666 Via Rosas, San Lorenzo, CA?

17666 Via Rosas, San Lorenzo, CA is assigned to Bohannon Middle School (middle), rated C-; Del Rey Elementary School (elementary), rated C+; Arroyo High School (high), rated B+. All sit in San Lorenzo Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 17666 Via Rosas, San Lorenzo, CA compare to other homes in San Lorenzo 94580?

Among the 8,131 homes in San Lorenzo 94580, it is worth more than 46% of them ($745,144 against a typical $754,891), its price per square foot is higher than 78% of them ($657 against a typical $571), it is bigger than 36% of them (1,134 ft² against a typical 1,291 ft²), its lot is bigger than 72% of them (0.13 ac against a typical 0.12 ac) and it is newer than 28% of them (1947 against a typical 1951). Measured against all of Alameda County, it is worth more than 27% 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 17666 Via Rosas, San Lorenzo, CA?

The 2025 property tax bill for 17666 Via Rosas, San Lorenzo, CA was $2,055. The county assessed it at $83,605.

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