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Single Family ResidenceResidential
$636,854$573 / 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
Last sold for $93,200 on Sep 28, 2010

257 ALLAN AVE

ROHNERT PARK, CA 94928
3
Beds
2
Baths
1,112 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.
1959
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
3
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$637K
$611K low$663K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$93,200 · Sep 28, 2010

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,968 (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.$341,081 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$131,164
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$209,917
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$334,394

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.16
54
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
1
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
27
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.17 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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.minimal

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
CountySONOMA
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.1960
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)
HeatingThe type of heating system in the home.None
CoolingThe type of cooling or air conditioning in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(6)

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
John Reed Elementary SchoolD-
Elementary · Grades KG–5 · 0.2 mi
M
Technology Middle SchoolF
Middle · Grades 6–8 · 0.5 mi
H
Rancho Cortate High SchoolC-
High · Grades 9–12 · 1.3 mi

District: Cotati-Rohnert Park Unified School District

Neighborhood · ZIP 94928These 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.74
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.87
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.429

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.20%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.1%
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.38,270
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,396 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$93,170
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$115,834
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.33 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

257 Allan Ave 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 Sonoma County
  • Costs more per square foot than 96% of homes in Rohnert Park 94928
  • Smaller than 84% of homes in Rohnert Park 94928
  • Has a bigger lot than 71% of homes in Rohnert Park 94928
  • Older than 98% of homes in Rohnert Park 94928

What homes are worth in Rohnert Park 94928

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

This home
$329K$999K

This home is worth more than 34% of homes in Rohnert Park 94928.

How it measures up in Rohnert Park 94928

The dot is this home. The mark in the middle is the typical home in Rohnert Park 94928.

Estimated value$636,854
CheaperTypical $699,668Pricier

Pricier than 34% of homes nearby

Price per ft²$573
CheaperTypical $427Pricier

Pricier than 96% of homes nearby

Living area1,112 ft²
SmallerTypical 1,546 ft²Bigger

Bigger than 16% of homes nearby

Lot size0.16 ac
SmallerTypical 0.13 acBigger

Bigger than 71% of homes nearby

Year built1959
OlderTypical 1980Newer

Newer than 2% of homes nearby

How 257 Allan Ave ranks against every home in each area.
MeasureThis homeRohnert Park 94928Sonoma County
Estimated valuepricier than$636,85434% of homes27% of homes
Price per ft²pricier than$57396% of homes71% of homes
Living areabigger than1,112 ft²16% of homes18% of homes
Lot sizebigger than0.16 ac71% of homes46% of homes
Year builtnewer than19592% of homes22% of homes

About 257 Allan Ave

How much is 257 Allan Ave, Rohnert Park, CA worth?

The TopHap Estimate for 257 Allan Ave, Rohnert Park, CA is $636,854 as of Aug 30, 2026. The likely range is $610,760 to $662,948. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 257 Allan Ave, Rohnert Park, CA last sell?

257 Allan Ave, Rohnert Park, CA last sold on Sep 28, 2010 for $93,200, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 257 Allan Ave, Rohnert Park, CA?

257 Allan Ave, Rohnert Park, CA has 3 bedrooms, 2 bathrooms, 1,112 square feet of living space and a 0.16-acre lot.

When was 257 Allan Ave, Rohnert Park, CA built?

257 Allan Ave, Rohnert Park, CA was built in 1959, making it 67 years old. The building has 1 story.

What schools serve 257 Allan Ave, Rohnert Park, CA?

257 Allan Ave, Rohnert Park, CA is assigned to John Reed Elementary School (elementary), rated D-; Technology Middle School (middle), rated F; Rancho Cortate High School (high), rated C-. All sit in Cotati-Rohnert Park Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 257 Allan Ave, Rohnert Park, CA compare to other homes in Rohnert Park 94928?

Among the 13,012 homes in Rohnert Park 94928, it is worth more than 34% of them ($636,854 against a typical $699,668), its price per square foot is higher than 96% of them ($573 against a typical $427), it is bigger than 16% of them (1,112 ft² against a typical 1,546 ft²), its lot is bigger than 71% of them (0.16 ac against a typical 0.13 ac) and it is newer than 2% of them (1959 against a typical 1980). Measured against all of Sonoma 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 257 Allan Ave, Rohnert Park, CA?

The 2025 property tax bill for 257 Allan Ave, Rohnert Park, CA was $3,968. The county assessed it at $341,081.

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