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Single Family ResidenceResidential
$6,031,074$1,217 / 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 76How 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

421 PROSPECT SQ

PASADENA, CA 91103
8
Beds
6
Baths
4,954 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.
0.76 ac
Lot SizeThe size of the land the home sits on, from county records.
1915
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
22
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$6M
$4.6M low$7.5M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$14,380 (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.$1,203,599 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$316,983
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$886,616
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,180,000

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.0.76
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
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.Yes

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
James Madison Elementary SchoolD-
Elementary · Grades KG–5 · 1.2 mi
M
Octavia E. Butler Magnet Middle SchoolD+
Middle · Grades 6–8 · 1.5 mi
H
John Muir High SchoolC-
High · Grades 9–12 · 1.7 mi

District: Pasadena Unified School District

Neighborhood · ZIP 91103These 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.135
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.102
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.609

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.21%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.19%
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.26,272
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,318 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$80,857
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$117,608
Average tempThe average temperature here across a full year.64°F
Annual precipHow much rain and melted snow falls here in a typical year.21 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

421 Prospect Sq 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 Pasadena 91103
  • Costs more per square foot than 96% of homes in Los Angeles County
  • Bigger than 98% of homes in Brookside Park / Arroyo Terrace
  • Has a bigger lot than 89% of homes in Los Angeles County
  • Older than 97% of homes in Los Angeles County

What homes are worth in Pasadena 91103

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

This home
$537K$4.9M

This home is worth more than almost all homes in Pasadena 91103.

How it measures up in Pasadena 91103

The dot is this home. The mark in the middle is the typical home in Pasadena 91103.

Estimated value$6,031,074
CheaperTypical $997,836Pricier

Pricier than almost all homes nearby

Price per ft²$1217
CheaperTypical $754Pricier

Pricier than 91% of homes nearby

Living area4,954 ft²
SmallerTypical 1,553 ft²Bigger

Bigger than 97% of homes nearby

Lot size0.76 ac
SmallerTypical 0.22 acBigger

Bigger than 88% of homes nearby

Year built1915
OlderTypical 1947Newer

Newer than 15% of homes nearby

How 421 Prospect Sq ranks against every home in each area.
MeasureThis homeBrookside Park / Arroyo TerracePasadena 91103Los Angeles County
Estimated valuepricier than$6,031,07498% of homesalmost all homesalmost all homes
Price per ft²pricier than$121788% of homes91% of homes96% of homes
Living areabigger than4,954 ft²98% of homes97% of homes96% of homes
Lot sizebigger than0.76 ac72% of homes88% of homes89% of homes
Year builtnewer than19157% of homes15% of homes3% of homes

About 421 Prospect Sq

How much is 421 Prospect Sq, Pasadena, CA worth?

The TopHap Estimate for 421 Prospect Sq, Pasadena, CA is $6,031,074 as of Sep 24, 2026. The likely range is $4,573,362 to $7,488,786. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 421 Prospect Sq, Pasadena, CA last sell?

421 Prospect Sq, Pasadena, CA last sold on Feb 3, 2010, according to the county's recorded deed.

How big is 421 Prospect Sq, Pasadena, CA?

421 Prospect Sq, Pasadena, CA has 8 bedrooms, 6 bathrooms, 4,954 square feet of living space and a 0.76-acre lot.

When was 421 Prospect Sq, Pasadena, CA built?

421 Prospect Sq, Pasadena, CA was built in 1915, making it 111 years old. It is a conventional home. The building has 2 stories.

What schools serve 421 Prospect Sq, Pasadena, CA?

421 Prospect Sq, Pasadena, CA is assigned to James Madison Elementary School (elementary), rated D-; Octavia E. Butler Magnet Middle School (middle), rated D+; John Muir High School (high), rated C-. All sit in Pasadena Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 421 Prospect Sq, Pasadena, CA compare to other homes in Pasadena 91103?

Among the 5,719 homes in Pasadena 91103, it is worth more than almost all of them ($6,031,074 against a typical $997,836), its price per square foot is higher than 91% of them ($1217 against a typical $754), it is bigger than 97% of them (4,954 ft² against a typical 1,553 ft²), its lot is bigger than 88% of them (0.76 ac against a typical 0.22 ac) and it is newer than 15% of them (1915 against a typical 1947). Measured against all of Los Angeles County, it is worth more than almost all 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 421 Prospect Sq, Pasadena, CA?

The 2025 property tax bill for 421 Prospect Sq, Pasadena, CA was $14,380. The county assessed it at $1,203,599.

More homes on Prospect Sq

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Assigned schools

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