Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$9,999,999$1,730 / 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 75How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $1,500,000 on Oct 12, 2001

81 ROCK RD

GREENBRAE, CA 94904
5
Beds
5.5
Baths
5,780 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.
0.55 ac
Lot SizeThe size of the land the home sits on, from county records.
2009
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

$10M
$8.5M 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.$1,500,000 · Oct 12, 2001

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$71,167 (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.$6,068,983 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,585,133
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$4,483,850
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$5,950,021

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
Lot (acres)The size of the land the home sits on, from county records.0.55
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 · 1,784 ft²Patio · 1,784 ft²

Transaction History(4)

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%

Owner Tools

Do you own this home?
Claim this home

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

81 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 97% of homes in Marin County
  • Among the largest homes in Marin County
  • Has a bigger lot than 88% of homes in Marin County
  • Among the newest 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
$556K$9.7M

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 $2,211,603Pricier

Pricier than almost all homes nearby

Price per ft²$1730
CheaperTypical $993Pricier

Pricier than 94% of homes nearby

Living area5,780 ft²
SmallerTypical 2,164 ft²Bigger

Bigger than 97% of homes nearby

Lot size0.55 ac
SmallerTypical 0.21 acBigger

Bigger than 82% of homes nearby

Year built2009
OlderTypical 1960Newer

Newer than almost all homes nearby

How 81 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$173094% of homes97% of homes
Living areabigger than5,780 ft²97% of homesalmost all homes
Lot sizebigger than0.55 ac82% of homes88% of homes
Year builtnewer than2009almost all homes98% of homes

About 81 Rock Rd

How much is 81 Rock Rd, Greenbrae, CA worth?

The TopHap Estimate for 81 Rock Rd, Greenbrae, CA is $9,999,999 as of Sep 24, 2026. The likely range is $8,543,971 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 81 Rock Rd, Greenbrae, CA last sell?

81 Rock Rd, Greenbrae, CA last sold on Oct 12, 2001 for $1,500,000, according to the county's recorded deed.

How big is 81 Rock Rd, Greenbrae, CA?

81 Rock Rd, Greenbrae, CA has 5 bedrooms, 5.5 bathrooms, 5,780 square feet of living space and a 0.55-acre lot.

When was 81 Rock Rd, Greenbrae, CA built?

81 Rock Rd, Greenbrae, CA was built in 2009, making it 17 years old. It is a contemporary home.

What schools serve 81 Rock Rd, Greenbrae, CA?

81 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 81 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 $2,211,603), its price per square foot is higher than 94% of them ($1730 against a typical $993), it is bigger than 97% of them (5,780 ft² against a typical 2,164 ft²), its lot is bigger than 82% of them (0.55 ac against a typical 0.21 ac) and it is newer than almost all of them (2009 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 81 Rock Rd, Greenbrae, CA?

The 2025 property tax bill for 81 Rock Rd, Greenbrae, CA was $71,167. The county assessed it at $6,068,983.

More homes on Rock Rd

Closest homes

More homes in Greenbrae 94904

Assigned schools

Explore the area

See this home in context

Open 81 Rock Rd on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map