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Commercial Office (General)Commercial
Last sold for $10,000,000 on Apr 26, 2019

1320 ARNOLD DR

MARTINEZ, CA 94553
0
Baths
97,840 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.
4.94 ac
Lot SizeThe size of the land the home sits on, from county records.
1983
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$10,000,000 · Apr 26, 2019

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$153,977 (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.$10,200,000 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$3,671,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$6,528,100
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$11,155,184

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.
39
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
43
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
14
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.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%

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Commercial Office (General)
CountyCONTRA COSTA
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1984
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(6)

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
Hidden Valley Elementary SchoolB+
Elementary · Grades KG–5 · 0.9 mi
H
College Park High SchoolB+
High · Grades 9–12 · 2.5 mi
M
Valley View Middle SchoolB
Middle · Grades 6–8 · 2.5 mi

District: Mount Diablo Unified School District

Neighborhood · ZIP 94553These 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.84
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.490

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.29%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.4%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.5%
PopulationHow many people live in this area.49,416
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.869 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$125,557
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$148,117
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.23 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.78%

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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

1320 Arnold 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.

  • Among the largest homes in Martinez 94553
  • Among the largest lots in Contra Costa County
  • Newer than 73% of homes in Martinez 94553

How it measures up in Martinez 94553

The dot is this home. The mark in the middle is the typical home in Martinez 94553.

Living area97,840 ft²
SmallerTypical 1,550 ft²Bigger

Bigger than almost all homes nearby

Lot size4.94 ac
SmallerTypical 0.14 acBigger

Bigger than 98% of homes nearby

Year built1983
OlderTypical 1973Newer

Newer than 73% of homes nearby

How 1320 Arnold Dr ranks against every home in each area.
MeasureThis homeMartinez 94553Contra Costa County
Living areabigger than97,840 ft²almost all homesalmost all homes
Lot sizebigger than4.94 ac98% of homesalmost all homes
Year builtnewer than198373% of homes60% of homes

About 1320 Arnold Dr

When did 1320 Arnold Dr, Martinez, CA last sell?

1320 Arnold Dr, Martinez, CA last sold on Apr 26, 2019 for $10,000,000, according to the county's recorded deed. TopHap holds 5 recorded sales for this parcel.

When was 1320 Arnold Dr, Martinez, CA built?

1320 Arnold Dr, Martinez, CA was built in 1983, making it 43 years old. The building has 1 story.

What schools serve 1320 Arnold Dr, Martinez, CA?

1320 Arnold Dr, Martinez, CA is assigned to Hidden Valley Elementary School (elementary), rated B+; College Park High School (high), rated B+; Valley View Middle School (middle), rated B. All sit in Mount Diablo Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 1320 Arnold Dr, Martinez, CA compare to other homes in Martinez 94553?

Among the 16,278 homes in Martinez 94553, it is bigger than almost all of them (97,840 ft² against a typical 1,550 ft²), its lot is bigger than 98% of them (4.94 ac against a typical 0.14 ac) and it is newer than 73% of them (1983 against a typical 1973). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 1320 Arnold Dr, Martinez, CA?

The 2025 property tax bill for 1320 Arnold Dr, Martinez, CA was $153,977. The county assessed it at $10,200,000.

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