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Single Family ResidenceResidential
$1,531,312$922 / 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 94How 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

509 STARBOARD DR

SAN MATEO, CA 94404
3
Beds
2.5
Baths
1,660 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.
2,423 ft²
Lot SizeThe size of the land the home sits on, from county records.
1967
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.5M
$1.4M low$1.6M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,227 (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.$397,251 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$198,527
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$198,724
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$389,463
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,593,360

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountySAN MATEO
Lot (acres)The size of the land the home sits on, from county records.0.06
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Basement
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.

M
Bayside AcademyB-
Middle · Grades KG–8 · 0.3 mi
E
LEAD Elementary SchoolD
Elementary · Grades KG–5 · 0.7 mi
H
Aragon High SchoolA+
High · Grades 9–12 · 2.5 mi

District: San Mateo-Foster City Elementary School District

Neighborhood · ZIP 94404These 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.78
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.88
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.469

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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.35%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.34,562
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.7,017 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$165,214
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$197,174
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.18 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.66%

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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

509 Starboard Dr 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 82% of homes in Mariner's Isle
  • Costs more per square foot than 81% of homes in Mariner's Isle
  • Bigger than 81% of homes in Mariner's Isle
  • Has a smaller lot than 96% of homes in San Mateo County
  • Older than 96% of homes in Mariner's Isle

What homes are worth in San Mateo 94404

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

This home
$587K$2.8M

This home is worth more than 48% of homes in San Mateo 94404.

How it measures up in San Mateo 94404

The dot is this home. The mark in the middle is the typical home in San Mateo 94404.

Estimated value$1,531,312
CheaperTypical $1,569,662Pricier

Pricier than 48% of homes nearby

Price per ft²$922
CheaperTypical $915Pricier

Pricier than 52% of homes nearby

Living area1,660 ft²
SmallerTypical 1,670 ft²Bigger

Bigger than 49% of homes nearby

Lot size2,423 ft²
SmallerTypical 0.14 acBigger

Bigger than 19% of homes nearby

Year built1967
OlderTypical 1974Newer

Newer than 18% of homes nearby

How 509 Starboard Dr ranks against every home in each area.
MeasureThis homeMariner's IsleSan Mateo 94404San Mateo County
Estimated valuepricier than$1,531,31282% of homes48% of homes53% of homes
Price per ft²pricier than$92281% of homes52% of homes45% of homes
Living areabigger than1,660 ft²81% of homes49% of homes53% of homes
Lot sizebigger than2,423 ft²13% of homes19% of homes4% of homes
Year builtnewer than19674% of homes18% of homes64% of homes

About 509 Starboard Dr

How much is 509 Starboard Dr, San Mateo, CA worth?

The TopHap Estimate for 509 Starboard Dr, San Mateo, CA is $1,531,312 as of Aug 30, 2026. The likely range is $1,432,048 to $1,630,576. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 509 Starboard Dr, San Mateo, CA last sell?

509 Starboard Dr, San Mateo, CA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 509 Starboard Dr, San Mateo, CA?

509 Starboard Dr, San Mateo, CA has 3 bedrooms, 2.5 bathrooms, 1,660 square feet of living space and a 0.06-acre lot.

When was 509 Starboard Dr, San Mateo, CA built?

509 Starboard Dr, San Mateo, CA was built in 1967, making it 59 years old. The building has 2 stories.

What schools serve 509 Starboard Dr, San Mateo, CA?

509 Starboard Dr, San Mateo, CA is assigned to Bayside Academy (middle), rated B-; LEAD Elementary School (elementary), rated D; Aragon High School (high), rated A+. All sit in San Mateo-Foster City Elementary School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 509 Starboard Dr, San Mateo, CA compare to other homes in San Mateo 94404?

Among the 10,362 homes in San Mateo 94404, it is worth more than 48% of them ($1,531,312 against a typical $1,569,662), its price per square foot is higher than 52% of them ($922 against a typical $915), it is bigger than 49% of them (1,660 ft² against a typical 1,670 ft²), its lot is bigger than 19% of them (2,423 ft² against a typical 0.14 ac) and it is newer than 18% of them (1967 against a typical 1974). Measured against all of San Mateo County, it is worth more than 53% 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 509 Starboard Dr, San Mateo, CA?

The 2025 property tax bill for 509 Starboard Dr, San Mateo, CA was $6,227. The county assessed it at $397,251.

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