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Single Family ResidenceResidential
$4,864,004$1,697 / 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 85How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026
Last sold for $4,735,000 on Sep 6, 2024

21 ALLEN AVE

ROSS, CA 94957
4
Beds
3
Baths
2,866 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.
0.28 ac
Lot SizeThe size of the land the home sits on, from county records.
1948
Year BuiltThe year the home was originally built, according to county records.

Valuation

$4.9M
$4.1M low$5.6M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$4,735,000 · Sep 6, 2024
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$2,429,004
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$1,943,203
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.51%
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.$2,435,000
LROD7 PROPERTIES LLC · recorded Sep 6, 2024

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$58,768 (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.$4,870,500 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$2,856,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$2,014,500
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$4,735,000

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.197 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.34%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.1 percent flood zone

Scores 0–100; higher = greater projected risk.

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.1983
Lot (acres)The size of the land the home sits on, from county records.0.28
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 · 500 ft²

Transaction History(9)

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 · 0.1 mi
H
Redwood High SchoolA+
High · Grades 9–12 · 2.4 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.Yes

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

21 Allen 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.

  • Worth more than 97% of homes in Marin County
  • Costs more per square foot than 97% of homes in Marin County
  • Bigger than 84% of homes in Marin County
  • Has a bigger lot than 72% of homes in Marin County
  • Older than 80% of homes in Marin County

What homes are worth in Ross 94957

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

This home
$1.7M$8.6M

This home is worth more than 69% 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.

Estimated value$4,864,004
CheaperTypical $3,829,447Pricier

Pricier than 69% of homes nearby

Price per ft²$1697
CheaperTypical $1521Pricier

Pricier than 70% of homes nearby

Living area2,866 ft²
SmallerTypical 2,775 ft²Bigger

Bigger than 53% of homes nearby

Lot size0.28 ac
SmallerTypical 0.39 acBigger

Bigger than 35% of homes nearby

Year built1948
OlderTypical 1937Newer

Newer than 62% of homes nearby

How 21 Allen Ave ranks against every home in each area.
MeasureThis homeRoss 94957Marin County
Estimated valuepricier than$4,864,00469% of homes97% of homes
Price per ft²pricier than$169770% of homes97% of homes
Living areabigger than2,866 ft²53% of homes84% of homes
Lot sizebigger than0.28 ac35% of homes72% of homes
Year builtnewer than194862% of homes20% of homes

About 21 Allen Ave

How much is 21 Allen Ave, Ross, CA worth?

The TopHap Estimate for 21 Allen Ave, Ross, CA is $4,864,004 as of Jul 14, 2026. The likely range is $4,131,034 to $5,596,974. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Allen Ave, Ross, CA last sell?

21 Allen Ave, Ross, CA last sold on Sep 6, 2024 for $4,735,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 21 Allen Ave, Ross, CA?

21 Allen Ave, Ross, CA has 4 bedrooms, 3 bathrooms, 2,866 square feet of living space and a 0.28-acre lot.

When was 21 Allen Ave, Ross, CA built?

21 Allen Ave, Ross, CA was built in 1948, making it 78 years old. It is a contemporary home.

What schools serve 21 Allen Ave, Ross, CA?

21 Allen 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 21 Allen Ave, Ross, CA compare to other homes in Ross 94957?

Among the 817 homes in Ross 94957, it is worth more than 69% of them ($4,864,004 against a typical $3,829,447), its price per square foot is higher than 70% of them ($1697 against a typical $1521), it is bigger than 53% of them (2,866 ft² against a typical 2,775 ft²), its lot is bigger than 35% of them (0.28 ac against a typical 0.39 ac) and it is newer than 62% of them (1948 against a typical 1937). Measured against all of Marin County, it is worth more than 97% 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 21 Allen Ave, Ross, CA?

The 2025 property tax bill for 21 Allen Ave, Ross, CA was $58,768. The county assessed it at $4,870,500.

More homes on Allen Ave

Closest homes

More homes in Ross 94957

Assigned schools

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