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Single Family ResidenceResidential
$601,181$584 / 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 94How 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

403 E ALTERN ST

MONROVIA, CA 91016
3
Beds
1
Baths
1,029 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.
0.18 ac
Lot SizeThe size of the land the home sits on, from county records.
1949
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$601K
$566K low$637K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,046 (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.$43,935 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$16,715
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$27,220
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$43,076

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.9 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
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.0.18
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.Wood Shingle
HeatingThe type of heating system in the home.Floor/Wall Furnace
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.

M
Santa Fe Computer Science Magnet SchoolB-
Middle · Grades 6–8 · 0.6 mi
E
Plymouth Elementary SchoolA-
Elementary · Grades KG–5 · 0.8 mi
H
Monrovia High SchoolB+
High · Grades 9–12 · 1.9 mi

District: Monrovia Unified School District

Neighborhood · ZIP 91016These 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.97
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.104
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.694

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.95%
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.8.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.7%
PopulationHow many people live in this area.41,126
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,298 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$91,319
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$114,406
Average tempThe average temperature here across a full year.61°F
Annual precipHow much rain and melted snow falls here in a typical year.32 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

403 E Altern 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 less than 94% of homes in Monrovia 91016
  • Costs less per square foot than 68% of homes in Monrovia 91016
  • Smaller than 87% of homes in Monrovia 91016
  • Older than 69% of homes in Los Angeles County

What homes are worth in Monrovia 91016

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

This home
$545K$2M

This home is worth more than 6% of homes in Monrovia 91016.

How it measures up in Monrovia 91016

The dot is this home. The mark in the middle is the typical home in Monrovia 91016.

Estimated value$601,181
CheaperTypical $934,452Pricier

Pricier than 6% of homes nearby

Price per ft²$584
CheaperTypical $660Pricier

Pricier than 32% of homes nearby

Living area1,029 ft²
SmallerTypical 1,548 ft²Bigger

Bigger than 13% of homes nearby

Lot size0.18 ac
SmallerTypical 0.18 acBigger

Bigger than 47% of homes nearby

Year built1949
OlderTypical 1951Newer

Newer than 46% of homes nearby

How 403 E Altern St ranks against every home in each area.
MeasureThis homeMonrovia 91016Los Angeles County
Estimated valuepricier than$601,1816% of homes18% of homes
Price per ft²pricier than$58432% of homes52% of homes
Living areabigger than1,029 ft²13% of homes13% of homes
Lot sizebigger than0.18 ac47% of homes56% of homes
Year builtnewer than194946% of homes31% of homes

About 403 E Altern St

How much is 403 E Altern St, Monrovia, CA worth?

The TopHap Estimate for 403 E Altern St, Monrovia, CA is $601,181 as of Sep 24, 2026. The likely range is $565,562 to $636,800. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 403 E Altern St, Monrovia, CA last sell?

403 E Altern St, Monrovia, CA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 403 E Altern St, Monrovia, CA?

403 E Altern St, Monrovia, CA has 3 bedrooms, 1 bathrooms, 1,029 square feet of living space and a 0.18-acre lot.

When was 403 E Altern St, Monrovia, CA built?

403 E Altern St, Monrovia, CA was built in 1949, making it 77 years old. It is a conventional home. The building has 1 story.

What schools serve 403 E Altern St, Monrovia, CA?

403 E Altern St, Monrovia, CA is assigned to Santa Fe Computer Science Magnet School (middle), rated B-; Plymouth Elementary School (elementary), rated A-; Monrovia High School (high), rated B+. All sit in Monrovia Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 403 E Altern St, Monrovia, CA compare to other homes in Monrovia 91016?

Among the 10,401 homes in Monrovia 91016, it is worth more than 6% of them ($601,181 against a typical $934,452), its price per square foot is higher than 32% of them ($584 against a typical $660), it is bigger than 13% of them (1,029 ft² against a typical 1,548 ft²), its lot is bigger than 47% of them (0.18 ac against a typical 0.18 ac) and it is newer than 46% of them (1949 against a typical 1951). Measured against all of Los Angeles County, it is worth more than 18% 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 403 E Altern St, Monrovia, CA?

The 2025 property tax bill for 403 E Altern St, Monrovia, CA was $1,046. The county assessed it at $43,935.

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