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CondominiumResidential
$1,340,664$638 / 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 96How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026
Last sold for $1,350,000 on Aug 10, 2018

100 HARBOR SEAL CT

SAN MATEO, CA 94404
3
Beds
2.5
Baths
2,100 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.
2.52 ac
Lot SizeThe size of the land the home sits on, from county records.
1979
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.

Valuation

$1.3M
$1.3M low$1.4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,350,000 · Aug 10, 2018

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$18,758 (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.$1,536,063 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$460,817
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,075,246
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,505,945
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,370,250

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Condominium
StyleThe architectural style of the home, such as ranch or colonial.Condo/Apartment
CountySAN MATEO
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Carport (Unspecified)
PoolWhether the property has a pool, and what kind, such as in-ground.Yes
ViewThe type of view from the property, or another feature of the site that affects value.End Unit

Transaction History(6)

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 · 0.7 mi
E
LEAD Elementary SchoolD-
Elementary · Grades KG–5 · 1.1 mi
H
Aragon High SchoolA
High · Grades 9–12 · 2.3 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

100 Harbor Seal Ct 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 77% of homes in Mariner's Isle
  • Among the lowest price per square foot in Mariner's Isle
  • Bigger than 94% of homes in Mariner's Isle
  • Has a bigger lot than 92% of homes in San Mateo County
  • Newer than 86% 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
$592K$2.8M

This home is worth more than 38% 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$1,340,664
CheaperTypical $1,550,344Pricier

Pricier than 38% of homes nearby

Price per ft²$638
CheaperTypical $893Pricier

Pricier than 7% of homes nearby

Living area2,100 ft²
SmallerTypical 1,670 ft²Bigger

Bigger than 74% of homes nearby

Lot size2.52 ac
SmallerTypical 0.14 acBigger

Bigger than 83% of homes nearby

Year built1979
OlderTypical 1974Newer

Newer than 75% of homes nearby

How 100 Harbor Seal Ct ranks against every home in each area.
MeasureThis homeMariner's IsleSan Mateo 94404San Mateo County
Estimated valuepricier than$1,340,66477% of homes38% of homes44% of homes
Price per ft²pricier than$638almost no homes7% of homes10% of homes
Living areabigger than2,100 ft²94% of homes74% of homes70% of homes
Lot sizebigger than2.52 ac91% of homes83% of homes92% of homes
Year builtnewer than197986% of homes75% of homes80% of homes

About 100 Harbor Seal Ct

How much is 100 Harbor Seal Ct, San Mateo, CA worth?

The TopHap Estimate for 100 Harbor Seal Ct, San Mateo, CA is $1,340,664 as of Oct 21, 2026. The likely range is $1,290,445 to $1,390,883. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 100 Harbor Seal Ct, San Mateo, CA last sell?

100 Harbor Seal Ct, San Mateo, CA last sold on Aug 10, 2018 for $1,350,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 100 Harbor Seal Ct, San Mateo, CA?

100 Harbor Seal Ct, San Mateo, CA has 3 bedrooms, 2.5 bathrooms and 2,100 square feet of living space.

When was 100 Harbor Seal Ct, San Mateo, CA built?

100 Harbor Seal Ct, San Mateo, CA was built in 1979, making it 47 years old. It is a condo/apartment home. The building has 2 stories.

What schools serve 100 Harbor Seal Ct, San Mateo, CA?

100 Harbor Seal Ct, 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 100 Harbor Seal Ct, 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 38% of them ($1,340,664 against a typical $1,550,344), its price per square foot is higher than 7% of them ($638 against a typical $893), it is bigger than 74% of them (2,100 ft² against a typical 1,670 ft²), its lot is bigger than 83% of them (2.52 ac against a typical 0.14 ac) and it is newer than 75% of them (1979 against a typical 1974). Measured against all of San Mateo County, it is worth more than 44% 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 100 Harbor Seal Ct, San Mateo, CA?

The 2025 property tax bill for 100 Harbor Seal Ct, San Mateo, CA was $18,758. The county assessed it at $1,536,063.

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