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Single Family ResidenceResidential
$1,034,512$588 / 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 91How 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

3821 WALNUT GROVE AVE

ROSEMEAD, CA 91770
3
Beds
3
Baths
1,759 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.
0.24 ac
Lot SizeThe size of the land the home sits on, from county records.
1984
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$1M
$937K low$1.1M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,938 (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.$284,328 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$113,727
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$170,601
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$278,754

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.6 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
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
StyleThe architectural style of the home, such as ranch or colonial.Conventional
CountyLOS ANGELES
Lot (acres)The size of the land the home sits on, from county records.0.24
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(1)

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
Mildred B. Janson Elementary SchoolA+
Elementary · Grades KG–6 · 0.2 mi
M
Muscatel Middle SchoolA
Middle · Grades 7–8 · 0.6 mi
H
Rosemead High SchoolA-
High · Grades 9–12 · 0.8 mi

District: Rosemead Elementary School District

Neighborhood · ZIP 91770These 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.57
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.109
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.386

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.11%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.6%
PopulationHow many people live in this area.57,788
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.8,576 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$63,486
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$83,265
Average tempThe average temperature here across a full year.65°F
Annual precipHow much rain and melted snow falls here in a typical year.16 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

3821 Walnut Grove 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 more than 85% of homes in Rosemead 91770
  • Has a bigger lot than 82% of homes in Rosemead 91770
  • Newer than 85% of homes in Rosemead 91770

What homes are worth in Rosemead 91770

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

This home
$473K$1.4M

This home is worth more than 85% of homes in Rosemead 91770.

How it measures up in Rosemead 91770

The dot is this home. The mark in the middle is the typical home in Rosemead 91770.

Estimated value$1,034,512
CheaperTypical $810,598Pricier

Pricier than 85% of homes nearby

Price per ft²$588
CheaperTypical $558Pricier

Pricier than 57% of homes nearby

Living area1,759 ft²
SmallerTypical 1,524 ft²Bigger

Bigger than 62% of homes nearby

Lot size0.24 ac
SmallerTypical 0.16 acBigger

Bigger than 82% of homes nearby

Year built1984
OlderTypical 1953Newer

Newer than 85% of homes nearby

How 3821 Walnut Grove Ave ranks against every home in each area.
MeasureThis homeRosemead 91770Los Angeles County
Estimated valuepricier than$1,034,51285% of homes67% of homes
Price per ft²pricier than$58857% of homes56% of homes
Living areabigger than1,759 ft²62% of homes60% of homes
Lot sizebigger than0.24 ac82% of homes71% of homes
Year builtnewer than198485% of homes80% of homes

About 3821 Walnut Grove Ave

How much is 3821 Walnut Grove Ave, Rosemead, CA worth?

The TopHap Estimate for 3821 Walnut Grove Ave, Rosemead, CA is $1,034,512 as of Aug 30, 2026. The likely range is $937,444 to $1,131,580. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 3821 Walnut Grove Ave, Rosemead, CA last sell?

3821 Walnut Grove Ave, Rosemead, CA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 3821 Walnut Grove Ave, Rosemead, CA?

3821 Walnut Grove Ave, Rosemead, CA has 3 bedrooms, 3 bathrooms, 1,759 square feet of living space and a 0.24-acre lot.

When was 3821 Walnut Grove Ave, Rosemead, CA built?

3821 Walnut Grove Ave, Rosemead, CA was built in 1984, making it 42 years old. It is a conventional home. The building has 2 stories.

What schools serve 3821 Walnut Grove Ave, Rosemead, CA?

3821 Walnut Grove Ave, Rosemead, CA is assigned to Mildred B. Janson Elementary School (elementary), rated A+; Muscatel Middle School (middle), rated A; Rosemead High School (high), rated A-. All sit in Rosemead Elementary School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 3821 Walnut Grove Ave, Rosemead, CA compare to other homes in Rosemead 91770?

Among the 11,982 homes in Rosemead 91770, it is worth more than 85% of them ($1,034,512 against a typical $810,598), its price per square foot is higher than 57% of them ($588 against a typical $558), it is bigger than 62% of them (1,759 ft² against a typical 1,524 ft²), its lot is bigger than 82% of them (0.24 ac against a typical 0.16 ac) and it is newer than 85% of them (1984 against a typical 1953). Measured against all of Los Angeles County, it is worth more than 67% 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 3821 Walnut Grove Ave, Rosemead, CA?

The 2025 property tax bill for 3821 Walnut Grove Ave, Rosemead, CA was $3,938. The county assessed it at $284,328.

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