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Single Family ResidenceResidential
$1,306,447$382 / 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 95How 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 $141,500 on Jun 30, 1988

3921 MASCARI PL

SPRING VALLEY, CA 91977
5
Beds
4
Baths
3,416 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.
0.46 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.
7
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.3M
$1.2M low$1.4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$141,500 · Jun 30, 1988

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$10,071 (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.$816,040 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$92,455
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$723,585
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$800,041

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.41
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
67
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
38
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
15
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
87
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.

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
CountySAN DIEGO
Lot (acres)The size of the land the home sits on, from county records.0.46
GarageWhether the property has a garage, and details like whether it is attached to the home.Carport (Unspecified)
PoolWhether the property has a pool, and what kind, such as in-ground.Yes

Transaction History(4)

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
Spring Valley AcademyD+
Middle · Grades 6–8 · 0.3 mi
E
Murdock Elementary SchoolB
Elementary · Grades KG–5 · 0.7 mi
H
Monte Vista High SchoolB-
High · Grades 9–12 · 1.5 mi

District: La Mesa-Spring Valley School District

Neighborhood · ZIP 91977These 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.66
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.105
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.198

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.19%
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.1.3%
PopulationHow many people live in this area.61,121
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,580 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$86,172
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$118,122
Average tempThe average temperature here across a full year.63°F
Annual precipHow much rain and melted snow falls here in a typical year.13 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.68%

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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

3921 Mascari Pl 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 Spring Valley 91977
  • Costs less per square foot than 93% of homes in Casa de Oro-Mount Helix
  • Bigger than 98% of homes in Spring Valley 91977
  • Has a bigger lot than 71% of homes in Spring Valley 91977
  • Among the oldest homes in Spring Valley 91977

What homes are worth in Spring Valley 91977

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

This home
$402K$1.1M

This home is worth more than almost all homes in Spring Valley 91977.

How it measures up in Spring Valley 91977

The dot is this home. The mark in the middle is the typical home in Spring Valley 91977.

Estimated value$1,306,447
CheaperTypical $670,517Pricier

Pricier than almost all homes nearby

Price per ft²$382
CheaperTypical $457Pricier

Pricier than 18% of homes nearby

Living area3,416 ft²
SmallerTypical 1,476 ft²Bigger

Bigger than 98% of homes nearby

Lot size0.46 ac
SmallerTypical 0.23 acBigger

Bigger than 71% of homes nearby

Year built1938
OlderTypical 1976Newer

Older than almost all homes nearby

How 3921 Mascari Pl ranks against every home in each area.
MeasureThis homeCasa de Oro-Mount HelixSpring Valley 91977San Diego County
Estimated valuepricier than$1,306,44776% of homesalmost all homes76% of homes
Price per ft²pricier than$3827% of homes18% of homes8% of homes
Living areabigger than3,416 ft²89% of homes98% of homes94% of homes
Lot sizebigger than0.46 ac43% of homes71% of homes60% of homes
Year builtnewer than19382% of homesalmost no homesalmost no homes

About 3921 Mascari Pl

How much is 3921 Mascari Pl, Spring Valley, CA worth?

The TopHap Estimate for 3921 Mascari Pl, Spring Valley, CA is $1,306,447 as of Aug 30, 2026. The likely range is $1,240,331 to $1,372,563. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 3921 Mascari Pl, Spring Valley, CA last sell?

3921 Mascari Pl, Spring Valley, CA last sold on Jun 30, 1988 for $141,500, according to the county's recorded deed.

How big is 3921 Mascari Pl, Spring Valley, CA?

3921 Mascari Pl, Spring Valley, CA has 5 bedrooms, 4 bathrooms, 3,416 square feet of living space and a 0.46-acre lot.

When was 3921 Mascari Pl, Spring Valley, CA built?

3921 Mascari Pl, Spring Valley, CA was built in 1938, making it 88 years old.

What schools serve 3921 Mascari Pl, Spring Valley, CA?

3921 Mascari Pl, Spring Valley, CA is assigned to Spring Valley Academy (middle), rated D+; Murdock Elementary School (elementary), rated B; Monte Vista High School (high), rated B-. All sit in La Mesa-Spring Valley School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 3921 Mascari Pl, Spring Valley, CA compare to other homes in Spring Valley 91977?

Among the 15,108 homes in Spring Valley 91977, it is worth more than almost all of them ($1,306,447 against a typical $670,517), its price per square foot is higher than 18% of them ($382 against a typical $457), it is bigger than 98% of them (3,416 ft² against a typical 1,476 ft²), its lot is bigger than 71% of them (0.46 ac against a typical 0.23 ac) and it is newer than almost none of them (1938 against a typical 1976). Measured against all of San Diego County, it is worth more than 76% 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 3921 Mascari Pl, Spring Valley, CA?

The 2025 property tax bill for 3921 Mascari Pl, Spring Valley, CA was $10,071. The county assessed it at $816,040.

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