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Single Family ResidenceResidential
Last sold for $16,350,000 on Feb 11, 2026

12 UPPER AMES AVE

ROSS, CA 94957
6
Beds
8.5
Baths
6,969 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.
1.38 ac
Lot SizeThe size of the land the home sits on, from county records.
1964
Year BuiltThe year the home was originally built, according to county records.
3
ParkingThe number of parking spaces on the property, including the garage.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$16,350,000 · Feb 11, 2026
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.$10,000,000
JPMORGAN CHASE BANK N A · 5.13% 1 · recorded Apr 17, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$221,724 (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.$19,483,560 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$8,659,360
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$10,824,200
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$19,101,600

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.Contemporary
CountyMARIN
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.2000
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
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 600 ft²Patio · 720 ft²

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
Ross SchoolA+
Elementary · Grades KG–8 · 0.3 mi
H
Redwood High SchoolA+
High · Grades 9–12 · 2.7 mi

District: Tamalpais Union High School District

Neighborhood · ZIP 94957These 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.58
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.83
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.370

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.90%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.42%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.1%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.2,366
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,440 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$259,576
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$395,275
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.44 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.Owner occupied
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

12 Upper Ames Ave 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 Marin County
  • Has a bigger lot than 97% of homes in Marin County
  • Newer than 81% of homes in Ross 94957

How it measures up in Ross 94957

The dot is this home. The mark in the middle is the typical home in Ross 94957.

Living area6,969 ft²
SmallerTypical 2,775 ft²Bigger

Bigger than 95% of homes nearby

Lot size1.38 ac
SmallerTypical 0.39 acBigger

Bigger than 86% of homes nearby

Year built1964
OlderTypical 1937Newer

Newer than 81% of homes nearby

How 12 Upper Ames Ave ranks against every home in each area.
MeasureThis homeRoss 94957Marin County
Living areabigger than6,969 ft²95% of homesalmost all homes
Lot sizebigger than1.38 ac86% of homes97% of homes
Year builtnewer than196481% of homes54% of homes

About 12 Upper Ames Ave

When did 12 Upper Ames Ave, Ross, CA last sell?

12 Upper Ames Ave, Ross, CA last sold on Feb 11, 2026 for $16,350,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 12 Upper Ames Ave, Ross, CA?

12 Upper Ames Ave, Ross, CA has 6 bedrooms, 8.5 bathrooms and 6,969 square feet of living space.

When was 12 Upper Ames Ave, Ross, CA built?

12 Upper Ames Ave, Ross, CA was built in 1964, making it 62 years old. It is a contemporary home.

What schools serve 12 Upper Ames Ave, Ross, CA?

12 Upper Ames Ave, Ross, CA is assigned to Ross School (elementary), rated A+; Redwood High School (high), rated A+. All sit in Tamalpais Union High School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 12 Upper Ames Ave, Ross, CA compare to other homes in Ross 94957?

Among the 817 homes in Ross 94957, it is bigger than 95% of them (6,969 ft² against a typical 2,775 ft²), its lot is bigger than 86% of them (1.38 ac against a typical 0.39 ac) and it is newer than 81% of them (1964 against a typical 1937). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 12 Upper Ames Ave, Ross, CA?

The 2025 property tax bill for 12 Upper Ames Ave, Ross, CA was $221,724. The county assessed it at $19,483,560.

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Closest homes

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Assigned schools

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