Skip to content
Skip to content
TopHapOpen in map
Duplex (2 Units, Any Combination)Residential
Last sold for $220,000 on Apr 12, 2012

521 S 21ST ST

RICHMOND, CA 94804
4
Beds
2
Baths
1,352 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.
0.11 ac
Lot SizeThe size of the land the home sits on, from county records.
1960
Year BuiltThe year the home was originally built, according to county records.
1
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

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$220,000 · Apr 12, 2012
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$325,000
MUSE INC · recorded Jan 20, 2022

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$10,297 (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.$273,072 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$227,563
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$45,509
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$267,718

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.21
10
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
1
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
17
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
44
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
36
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.7 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Duplex (2 Units, Any Combination)
StyleThe architectural style of the home, such as ranch or colonial.Duplex Single
CountyCONTRA COSTA
Lot (acres)The size of the land the home sits on, from county records.0.12
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(5)

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
Coronado Elementary SchoolD+
Elementary · Grades KG–6 · 0.2 mi
M
DeJean Middle SchoolF
Middle · Grades 7–8 · 0.9 mi
H
Kennedy High SchoolD
High · Grades 9–12 · 1.1 mi

District: West Contra Costa Unified School District

Neighborhood · ZIP 94804These 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.133
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.84
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.561

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.19%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.15%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.44,926
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,044 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$80,581
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$109,956
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.22 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.78%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Absentee owner
Company ownedWhether the owner is a company or trust rather than a person.No

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

521 S 21st 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.

  • Smaller than 71% of homes in Contra Costa County
  • Has a smaller lot than 73% of homes in Contra Costa County
  • Newer than 82% of homes in Coronado

How it measures up in Richmond 94804

The dot is this home. The mark in the middle is the typical home in Richmond 94804.

Living area1,352 ft²
SmallerTypical 1,193 ft²Bigger

Bigger than 63% of homes nearby

Lot size0.11 ac
SmallerTypical 0.1 acBigger

Bigger than 55% of homes nearby

Year built1960
OlderTypical 1951Newer

Newer than 62% of homes nearby

How 521 S 21st St ranks against every home in each area.
MeasureThis homeCoronadoRichmond 94804Contra Costa County
Living areabigger than1,352 ft²66% of homes63% of homes29% of homes
Lot sizebigger than0.11 ac36% of homes55% of homes27% of homes
Year builtnewer than196082% of homes62% of homes26% of homes

About 521 S 21st St

When did 521 S 21st St, Richmond, CA last sell?

521 S 21st St, Richmond, CA last sold on Apr 12, 2012 for $220,000, according to the county's recorded deed.

How big is 521 S 21st St, Richmond, CA?

521 S 21st St, Richmond, CA has 4 bedrooms, 2 bathrooms, 1,352 square feet of living space and a 0.12-acre lot.

When was 521 S 21st St, Richmond, CA built?

521 S 21st St, Richmond, CA was built in 1960, making it 66 years old. It is a duplex single home. The building has 1 story.

What schools serve 521 S 21st St, Richmond, CA?

521 S 21st St, Richmond, CA is assigned to Coronado Elementary School (elementary), rated D+; DeJean Middle School (middle), rated F; Kennedy High School (high), rated D. All sit in West Contra Costa Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 521 S 21st St, Richmond, CA compare to other homes in Richmond 94804?

Among the 11,870 homes in Richmond 94804, it is bigger than 63% of them (1,352 ft² against a typical 1,193 ft²), its lot is bigger than 55% of them (0.11 ac against a typical 0.1 ac) and it is newer than 62% of them (1960 against a typical 1951). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 521 S 21st St, Richmond, CA?

The 2025 property tax bill for 521 S 21st St, Richmond, CA was $10,297. The county assessed it at $273,072.

Closest homes

More homes in Richmond 94804

Assigned schools

Explore the area

See this home in context

Open 521 S 21st St 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