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Single Family ResidenceResidential
$814,458$619 / 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

20 SINALOA AVE

FOREST KNOLLS, CA 94933
1
Beds
1
Baths
1,316 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.
0.53 ac
Lot SizeThe size of the land the home sits on, from county records.
1991
Year BuiltThe year the home was originally built, according to county records.

Valuation

$814K
$704K low$925K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,808 (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.$504,821 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$221,025
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$283,796
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$494,922

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.1992
Lot (acres)The size of the land the home sits on, from county records.0.53
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

Transaction History(3)

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
Lagunitas Elementary SchoolB+
Elementary · Grades KG–8 · 0.9 mi
H
Archie Williams High SchoolA+
High · Grades 9–12 · 6.5 mi

District: Tamalpais Union High School District

Neighborhood · ZIP 94933These 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.142
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.82
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.466

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.31%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.4%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.271
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.440 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$112,150
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$122,546
Average tempThe average temperature here across a full year.59°F
Annual precipHow much rain and melted snow falls here in a typical year.39 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 Sinaloa 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 less than 84% of homes in Marin County
  • Costs less per square foot than 72% of homes in Marin County
  • Smaller than 79% of homes in Marin County
  • Has a bigger lot than 88% of homes in Marin County
  • Newer than 94% of homes in Forest Knolls 94933

What homes are worth in Forest Knolls 94933

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

This home
$342K$1.9M

This home is worth more than 41% of homes in Forest Knolls 94933.

How it measures up in Forest Knolls 94933

The dot is this home. The mark in the middle is the typical home in Forest Knolls 94933.

Estimated value$814,458
CheaperTypical $883,697Pricier

Pricier than 41% of homes nearby

Price per ft²$619
CheaperTypical $636Pricier

Pricier than 43% of homes nearby

Living area1,316 ft²
SmallerTypical 1,432 ft²Bigger

Bigger than 42% of homes nearby

Lot size0.53 ac
SmallerTypical 0.34 acBigger

Bigger than 68% of homes nearby

Year built1991
OlderTypical 1930Newer

Newer than 94% of homes nearby

How 20 Sinaloa Ave ranks against every home in each area.
MeasureThis homeForest Knolls 94933Marin County
Estimated valuepricier than$814,45841% of homes16% of homes
Price per ft²pricier than$61943% of homes28% of homes
Living areabigger than1,316 ft²42% of homes21% of homes
Lot sizebigger than0.53 ac68% of homes88% of homes
Year builtnewer than199194% of homes90% of homes

About 20 Sinaloa Ave

How much is 20 Sinaloa Ave, Forest Knolls, CA worth?

The TopHap Estimate for 20 Sinaloa Ave, Forest Knolls, CA is $814,458 as of Aug 30, 2026. The likely range is $703,943 to $924,973. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Sinaloa Ave, Forest Knolls, CA last sell?

20 Sinaloa Ave, Forest Knolls, CA last sold on Jan 1, 1900, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 20 Sinaloa Ave, Forest Knolls, CA?

20 Sinaloa Ave, Forest Knolls, CA has 1 bedrooms, 1 bathrooms, 1,316 square feet of living space and a 0.53-acre lot.

When was 20 Sinaloa Ave, Forest Knolls, CA built?

20 Sinaloa Ave, Forest Knolls, CA was built in 1991, making it 35 years old. It is a contemporary home.

What schools serve 20 Sinaloa Ave, Forest Knolls, CA?

20 Sinaloa Ave, Forest Knolls, CA is assigned to Lagunitas Elementary School (elementary), rated B+; Archie Williams 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 Sinaloa Ave, Forest Knolls, CA compare to other homes in Forest Knolls 94933?

Among the 306 homes in Forest Knolls 94933, it is worth more than 41% of them ($814,458 against a typical $883,697), its price per square foot is higher than 43% of them ($619 against a typical $636), it is bigger than 42% of them (1,316 ft² against a typical 1,432 ft²), its lot is bigger than 68% of them (0.53 ac against a typical 0.34 ac) and it is newer than 94% of them (1991 against a typical 1930). Measured against all of Marin County, it is worth more than 16% 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 Sinaloa Ave, Forest Knolls, CA?

The 2025 property tax bill for 20 Sinaloa Ave, Forest Knolls, CA was $5,808. The county assessed it at $504,821.

More homes on Sinaloa Ave

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Assigned schools

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