Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$1,410,495$533 / 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 Oct 21, 2026

20231 PORTSIDE DR

WALNUT, CA 91789
4
Beds
3
Baths
2,648 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.
0.27 ac
Lot SizeThe size of the land the home sits on, from county records.
1987
Year BuiltThe year the home was originally built, according to county records.

Valuation

$1.4M
$1.3M low$1.5M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,055 (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.$517,348 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$155,193
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$362,155
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$507,204

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyLOS ANGELES
Lot (acres)The size of the land the home sits on, from county records.0.27
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
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.

H
John A. Rowland High SchoolA-
High · Grades 9–12 · 1.4 mi
E
Ybarra Academy for the Arts and TechnologyB+
Elementary · Grades KG–8 · 1.4 mi

District: Rowland Unified School District

Neighborhood · ZIP 91789These 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.33
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.103
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.413

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.36%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.8%
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.45,013
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,690 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$110,530
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$137,487
Average tempThe average temperature here across a full year.64°F
Annual precipHow much rain and melted snow falls here in a typical year.18 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.73%

Owner Tools

Do you own this home?
Claim this home

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

20231 Portside Dr 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 82% of homes in Los Angeles County
  • Costs less per square foot than 69% of homes in Walnut 91789
  • Bigger than 84% of homes in Los Angeles County
  • Has a bigger lot than 75% of homes in Los Angeles County
  • Newer than 83% of homes in Los Angeles County

What homes are worth in Walnut 91789

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

This home
$503K$2.6M

This home is worth more than 76% of homes in Walnut 91789.

How it measures up in Walnut 91789

The dot is this home. The mark in the middle is the typical home in Walnut 91789.

Estimated value$1,410,495
CheaperTypical $1,103,521Pricier

Pricier than 76% of homes nearby

Price per ft²$533
CheaperTypical $563Pricier

Pricier than 31% of homes nearby

Living area2,648 ft²
SmallerTypical 1,984 ft²Bigger

Bigger than 81% of homes nearby

Lot size0.27 ac
SmallerTypical 0.23 acBigger

Bigger than 64% of homes nearby

Year built1987
OlderTypical 1983Newer

Newer than 78% of homes nearby

How 20231 Portside Dr ranks against every home in each area.
MeasureThis homeWalnut 91789Los Angeles County
Estimated valuepricier than$1,410,49576% of homes82% of homes
Price per ft²pricier than$53331% of homes40% of homes
Living areabigger than2,648 ft²81% of homes84% of homes
Lot sizebigger than0.27 ac64% of homes75% of homes
Year builtnewer than198778% of homes83% of homes

About 20231 Portside Dr

How much is 20231 Portside Dr, Walnut, CA worth?

The TopHap Estimate for 20231 Portside Dr, Walnut, CA is $1,410,495 as of Oct 21, 2026. The likely range is $1,336,252 to $1,484,738. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20231 Portside Dr, Walnut, CA last sell?

20231 Portside Dr, Walnut, CA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 20231 Portside Dr, Walnut, CA?

20231 Portside Dr, Walnut, CA has 4 bedrooms, 3 bathrooms, 2,648 square feet of living space and a 0.27-acre lot.

When was 20231 Portside Dr, Walnut, CA built?

20231 Portside Dr, Walnut, CA was built in 1987, making it 39 years old.

What schools serve 20231 Portside Dr, Walnut, CA?

20231 Portside Dr, Walnut, CA is assigned to John A. Rowland High School (high), rated A-; Ybarra Academy for the Arts and Technology (elementary), rated B+. All sit in Rowland Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20231 Portside Dr, Walnut, CA compare to other homes in Walnut 91789?

Among the 13,202 homes in Walnut 91789, it is worth more than 76% of them ($1,410,495 against a typical $1,103,521), its price per square foot is higher than 31% of them ($533 against a typical $563), it is bigger than 81% of them (2,648 ft² against a typical 1,984 ft²), its lot is bigger than 64% of them (0.27 ac against a typical 0.23 ac) and it is newer than 78% of them (1987 against a typical 1983). Measured against all of Los Angeles County, it is worth more than 82% 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 20231 Portside Dr, Walnut, CA?

The 2025 property tax bill for 20231 Portside Dr, Walnut, CA was $7,055. The county assessed it at $517,348.

More homes on Portside Dr

Closest homes

More homes in Walnut 91789

Assigned schools

Explore the area

See this home in context

Open 20231 Portside Dr on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map