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Single Family ResidenceResidential
$1,304,120$480 / 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 89How 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
Last sold for $429,500 on Oct 20, 1999

580 GRASS VALLEY ST

SIMI VALLEY, CA 93065
4
Beds
3
Baths
2,717 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.
0.28 ac
Lot SizeThe size of the land the home sits on, from county records.
1998
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
9
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

$1.3M
$1.2M low$1.5M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$429,500 · Oct 20, 1999

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,937 (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.$673,302 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$269,319
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$403,983
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$660,100

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.47
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
82
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
39
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
31
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
85
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
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
CountyVENTURA
Lot (acres)The size of the land the home sits on, from county records.0.28
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 200 ft²

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.

E
Wood Ranch Elementary SchoolB
Elementary · Grades KG–6 · 0.2 mi
M
Sinaloa Middle SchoolB-
Middle · Grades 6–8 · 2.9 mi
H
Royal High SchoolA-
High · Grades 9–12 · 3.2 mi

District: Simi Valley Unified School District

Neighborhood · ZIP 93065These 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.62
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.111
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.455

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.27%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.1%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.5%
PopulationHow many people live in this area.71,047
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,633 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$111,647
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$142,797
Average tempThe average temperature here across a full year.64°F
Annual precipHow much rain and melted snow falls here in a typical year.17 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.73%

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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

580 Grass Valley 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 more than 89% of homes in Simi Valley 93065
  • Bigger than 86% of homes in Ventura County
  • Has a bigger lot than 80% of homes in Simi Valley 93065
  • Newer than 84% of homes in Ventura County

What homes are worth in Simi Valley 93065

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

This home
$440K$1.7M

This home is worth more than 89% of homes in Simi Valley 93065.

How it measures up in Simi Valley 93065

The dot is this home. The mark in the middle is the typical home in Simi Valley 93065.

Estimated value$1,304,120
CheaperTypical $789,549Pricier

Pricier than 89% of homes nearby

Price per ft²$480
CheaperTypical $460Pricier

Pricier than 60% of homes nearby

Living area2,717 ft²
SmallerTypical 1,745 ft²Bigger

Bigger than 83% of homes nearby

Lot size0.28 ac
SmallerTypical 0.18 acBigger

Bigger than 80% of homes nearby

Year built1998
OlderTypical 1979Newer

Newer than 82% of homes nearby

How 580 Grass Valley St ranks against every home in each area.
MeasureThis homeSimi Valley 93065Ventura County
Estimated valuepricier than$1,304,12089% of homes85% of homes
Price per ft²pricier than$48060% of homes42% of homes
Living areabigger than2,717 ft²83% of homes86% of homes
Lot sizebigger than0.28 ac80% of homes79% of homes
Year builtnewer than199882% of homes84% of homes

About 580 Grass Valley St

How much is 580 Grass Valley St, Simi Valley, CA worth?

The TopHap Estimate for 580 Grass Valley St, Simi Valley, CA is $1,304,120 as of Sep 24, 2026. The likely range is $1,157,911 to $1,450,329. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 580 Grass Valley St, Simi Valley, CA last sell?

580 Grass Valley St, Simi Valley, CA last sold on Oct 20, 1999 for $429,500, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 580 Grass Valley St, Simi Valley, CA?

580 Grass Valley St, Simi Valley, CA has 4 bedrooms, 3 bathrooms, 2,717 square feet of living space and a 0.28-acre lot.

When was 580 Grass Valley St, Simi Valley, CA built?

580 Grass Valley St, Simi Valley, CA was built in 1998, making it 28 years old. The building has 2 stories.

What schools serve 580 Grass Valley St, Simi Valley, CA?

580 Grass Valley St, Simi Valley, CA is assigned to Wood Ranch Elementary School (elementary), rated B; Sinaloa Middle School (middle), rated B-; Royal High School (high), rated A-. All sit in Simi Valley Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 580 Grass Valley St, Simi Valley, CA compare to other homes in Simi Valley 93065?

Among the 21,571 homes in Simi Valley 93065, it is worth more than 89% of them ($1,304,120 against a typical $789,549), its price per square foot is higher than 60% of them ($480 against a typical $460), it is bigger than 83% of them (2,717 ft² against a typical 1,745 ft²), its lot is bigger than 80% of them (0.28 ac against a typical 0.18 ac) and it is newer than 82% of them (1998 against a typical 1979). Measured against all of Ventura County, it is worth more than 85% 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 580 Grass Valley St, Simi Valley, CA?

The 2025 property tax bill for 580 Grass Valley St, Simi Valley, CA was $7,937. The county assessed it at $673,302.

More homes on Grass Valley St

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