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Single Family ResidenceResidential
$9,999,999$1,195 / 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 82How 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 $450,000 on Jul 18, 2001

40 ROCK RD

GREENBRAE, CA 94904
5
Beds
6.5
Baths
8,367 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.
1.82 ac
Lot SizeThe size of the land the home sits on, from county records.
2000
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

$10M
$9.7M low$10M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$450,000 · Jul 18, 2001

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$89,327 (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.$8,447,000 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$7,000,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,447,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$7,387,000

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.2001
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 · 1,191 ft²Patio · 1,191 ft²

Transaction History(7)

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 · 0.6 mi
E
Bacich Elementary SchoolA+
Elementary · Grades KG–4 · 1.1 mi
H
Redwood High SchoolA+
High · Grades 9–12 · 2.2 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

40 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.

  • Among the most valuable homes in Greenbrae 94904
  • Costs more per square foot than 85% of homes in Marin County
  • Among the largest homes in Greenbrae 94904
  • Has a bigger lot than 98% of homes in Greenbrae 94904
  • Newer than 96% of homes in Greenbrae 94904

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
$524K$9.3M

This home is worth more than almost all 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$9,999,999
CheaperTypical $2,070,877Pricier

Pricier than almost all homes nearby

Price per ft²$1195
CheaperTypical $941Pricier

Pricier than 75% of homes nearby

Living area8,367 ft²
SmallerTypical 2,178 ft²Bigger

Bigger than almost all homes nearby

Lot size1.82 ac
SmallerTypical 0.21 acBigger

Bigger than 98% of homes nearby

Year built2000
OlderTypical 1960Newer

Newer than 96% of homes nearby

How 40 Rock Rd ranks against every home in each area.
MeasureThis homeGreenbrae 94904Marin County
Estimated valuepricier than$9,999,999almost all homesalmost all homes
Price per ft²pricier than$119575% of homes85% of homes
Living areabigger than8,367 ft²almost all homesalmost all homes
Lot sizebigger than1.82 ac98% of homes98% of homes
Year builtnewer than200096% of homes94% of homes

About 40 Rock Rd

How much is 40 Rock Rd, Greenbrae, CA worth?

The TopHap Estimate for 40 Rock Rd, Greenbrae, CA is $9,999,999 as of Aug 30, 2026. The likely range is $9,726,554 to $9,999,999. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 40 Rock Rd, Greenbrae, CA last sell?

40 Rock Rd, Greenbrae, CA last sold on Jul 18, 2001 for $450,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 40 Rock Rd, Greenbrae, CA?

40 Rock Rd, Greenbrae, CA has 5 bedrooms, 6.5 bathrooms and 8,367 square feet of living space.

When was 40 Rock Rd, Greenbrae, CA built?

40 Rock Rd, Greenbrae, CA was built in 2000, making it 26 years old. It is a contemporary home.

What schools serve 40 Rock Rd, Greenbrae, CA?

40 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 40 Rock Rd, Greenbrae, CA compare to other homes in Greenbrae 94904?

Among the 3,924 homes in Greenbrae 94904, it is worth more than almost all of them ($9,999,999 against a typical $2,070,877), its price per square foot is higher than 75% of them ($1195 against a typical $941), it is bigger than almost all of them (8,367 ft² against a typical 2,178 ft²), its lot is bigger than 98% of them (1.82 ac against a typical 0.21 ac) and it is newer than 96% of them (2000 against a typical 1960). Measured against all of Marin County, it is worth more than almost all 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 40 Rock Rd, Greenbrae, CA?

The 2025 property tax bill for 40 Rock Rd, Greenbrae, CA was $89,327. The county assessed it at $8,447,000.

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