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Single Family ResidenceResidential
$4,490,565$1,123 / 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 86How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026
Last sold for $1,805,000 on Aug 28, 1997

20 ROCK RD

GREENBRAE, CA 94904
4
Beds
3.5
Baths
3,998 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.
0.77 ac
Lot SizeThe size of the land the home sits on, from county records.
1955
Year BuiltThe year the home was originally built, according to county records.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$4.5M
$3.9M low$5.1M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,805,000 · Aug 28, 1997

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$38,278 (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.$2,959,996 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,331,416
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,628,580
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$2,901,962

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
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.1996
Lot (acres)The size of the land the home sits on, from county records.0.77
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.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 2,448 ft²

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.

M
Kent Middle SchoolA+
Middle · Grades 5–8 · 0.8 mi
E
Bacich Elementary SchoolA+
Elementary · Grades KG–4 · 1.2 mi
H
Redwood High SchoolA+
High · Grades 9–12 · 2.3 mi

District: Tamalpais Union High School District

Neighborhood · ZIP 94904These 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.65
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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.38%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.1%
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.12,542
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,071 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$168,659
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$250,743
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.45 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

20 Rock Rd 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 95% of homes in Marin County
  • Costs more per square foot than 82% of homes in Marin County
  • Bigger than 96% of homes in Marin County
  • Has a bigger lot than 92% of homes in Marin County
  • Older than 66% of homes in Marin County

What homes are worth in Greenbrae 94904

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

This home
$542K$9.6M

This home is worth more than 88% of homes in Greenbrae 94904.

How it measures up in Greenbrae 94904

The dot is this home. The mark in the middle is the typical home in Greenbrae 94904.

Estimated value$4,490,565
CheaperTypical $2,086,716Pricier

Pricier than 88% of homes nearby

Price per ft²$1123
CheaperTypical $943Pricier

Pricier than 70% of homes nearby

Living area3,998 ft²
SmallerTypical 2,174 ft²Bigger

Bigger than 90% of homes nearby

Lot size0.77 ac
SmallerTypical 0.21 acBigger

Bigger than 89% of homes nearby

Year built1955
OlderTypical 1960Newer

Newer than 38% of homes nearby

How 20 Rock Rd ranks against every home in each area.
MeasureThis homeGreenbrae 94904Marin County
Estimated valuepricier than$4,490,56588% of homes95% of homes
Price per ft²pricier than$112370% of homes82% of homes
Living areabigger than3,998 ft²90% of homes96% of homes
Lot sizebigger than0.77 ac89% of homes92% of homes
Year builtnewer than195538% of homes34% of homes

About 20 Rock Rd

How much is 20 Rock Rd, Greenbrae, CA worth?

The TopHap Estimate for 20 Rock Rd, Greenbrae, CA is $4,490,565 as of Aug 30, 2026. The likely range is $3,861,578 to $5,119,552. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Rock Rd, Greenbrae, CA last sell?

20 Rock Rd, Greenbrae, CA last sold on Aug 28, 1997 for $1,805,000, according to the county's recorded deed.

How big is 20 Rock Rd, Greenbrae, CA?

20 Rock Rd, Greenbrae, CA has 4 bedrooms, 3.5 bathrooms, 3,998 square feet of living space and a 0.77-acre lot.

When was 20 Rock Rd, Greenbrae, CA built?

20 Rock Rd, Greenbrae, CA was built in 1955, making it 71 years old.

What schools serve 20 Rock Rd, Greenbrae, CA?

20 Rock Rd, Greenbrae, CA is assigned to Kent Middle School (middle), rated A+; Bacich Elementary 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 20 Rock Rd, Greenbrae, CA compare to other homes in Greenbrae 94904?

Among the 3,924 homes in Greenbrae 94904, it is worth more than 88% of them ($4,490,565 against a typical $2,086,716), its price per square foot is higher than 70% of them ($1123 against a typical $943), it is bigger than 90% of them (3,998 ft² against a typical 2,174 ft²), its lot is bigger than 89% of them (0.77 ac against a typical 0.21 ac) and it is newer than 38% of them (1955 against a typical 1960). Measured against all of Marin County, it is worth more than 95% 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 20 Rock Rd, Greenbrae, CA?

The 2025 property tax bill for 20 Rock Rd, Greenbrae, CA was $38,278. The county assessed it at $2,959,996.

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