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Single Family ResidenceResidential
$1,699,784$857 / 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 Jul 14, 2026

600 FORTRESS ISLE

ALAMEDA, CA 94501
3
Beds
2
Baths
1,983 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.
0.17 ac
Lot SizeThe size of the land the home sits on, from county records.
1964
Year BuiltThe year the home was originally built, according to county records.
1
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

$1.7M
$1.6M low$1.8M high
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$644,584
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$515,667
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.64%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$611,000
FEDERAL SAVINGS BANK · recorded Nov 6, 2012
2nd MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$444,200
FREEDOM MORTGAGE CORP

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$11,015 (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.$812,436 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$297,932
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$695,175
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$798,337
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,534,680

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.14 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.0.2 percent flood zone

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyALAMEDA
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.1965
Lot (acres)The size of the land the home sits on, from county records.0.17
ConstructionThe main material the home's frame and walls are built from.Wood (Unspecified)
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(10)

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
Wood Middle SchoolB
Middle · Grades 6–8 · 0.1 mi
E
Franklin Elementary SchoolA
Elementary · Grades KG–5 · 0.4 mi
H
Alameda High SchoolA+
High · Grades 9–12 · 0.7 mi

District: Alameda City Unified School District

Neighborhood · ZIP 94501These 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.124
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 100.409

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.93%
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.8.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.61,491
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,332 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$122,273
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$153,309
Average tempThe average temperature here across a full year.58°F
Annual precipHow much rain and melted snow falls here in a typical year.20 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.78%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Absentee owner
Company ownedWhether the owner is a company or trust rather than a person.Yes

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

600 Fortress Isle 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 90% of homes in Alameda 94501
  • Costs more per square foot than 91% of homes in Bronze Coast
  • Bigger than 70% of homes in Alameda County
  • Has a bigger lot than 73% of homes in Alameda 94501
  • Newer than 81% of homes in Bronze Coast

What homes are worth in Alameda 94501

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

This home
$404K$2.2M

This home is worth more than 90% of homes in Alameda 94501.

How it measures up in Alameda 94501

The dot is this home. The mark in the middle is the typical home in Alameda 94501.

Estimated value$1,699,784
CheaperTypical $1,112,620Pricier

Pricier than 90% of homes nearby

Price per ft²$857
CheaperTypical $718Pricier

Pricier than 82% of homes nearby

Living area1,983 ft²
SmallerTypical 1,653 ft²Bigger

Bigger than 64% of homes nearby

Lot size0.17 ac
SmallerTypical 0.11 acBigger

Bigger than 73% of homes nearby

Year built1964
OlderTypical 1933Newer

Newer than 71% of homes nearby

How 600 Fortress Isle ranks against every home in each area.
MeasureThis homeBronze CoastAlameda 94501Alameda County
Estimated valuepricier than$1,699,78480% of homes90% of homes84% of homes
Price per ft²pricier than$85791% of homes82% of homes80% of homes
Living areabigger than1,983 ft²48% of homes64% of homes70% of homes
Lot sizebigger than0.17 ac50% of homes73% of homes66% of homes
Year builtnewer than196481% of homes71% of homes51% of homes

About 600 Fortress Isle

How much is 600 Fortress Isle, Alameda, CA worth?

The TopHap Estimate for 600 Fortress Isle, Alameda, CA is $1,699,784 as of Jul 14, 2026. The likely range is $1,625,853 to $1,773,715. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 600 Fortress Isle, Alameda, CA last sell?

600 Fortress Isle, Alameda, CA last sold on Oct 23, 2020, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 600 Fortress Isle, Alameda, CA?

600 Fortress Isle, Alameda, CA has 3 bedrooms, 2 bathrooms, 1,983 square feet of living space and a 0.17-acre lot.

When was 600 Fortress Isle, Alameda, CA built?

600 Fortress Isle, Alameda, CA was built in 1964, making it 62 years old. The building has 1 story.

What schools serve 600 Fortress Isle, Alameda, CA?

600 Fortress Isle, Alameda, CA is assigned to Wood Middle School (middle), rated B; Franklin Elementary School (elementary), rated A; Alameda High School (high), rated A+. All sit in Alameda City Unified School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 600 Fortress Isle, Alameda, CA compare to other homes in Alameda 94501?

Among the 14,890 homes in Alameda 94501, it is worth more than 90% of them ($1,699,784 against a typical $1,112,620), its price per square foot is higher than 82% of them ($857 against a typical $718), it is bigger than 64% of them (1,983 ft² against a typical 1,653 ft²), its lot is bigger than 73% of them (0.17 ac against a typical 0.11 ac) and it is newer than 71% of them (1964 against a typical 1933). Measured against all of Alameda County, it is worth more than 84% 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 600 Fortress Isle, Alameda, CA?

The 2025 property tax bill for 600 Fortress Isle, Alameda, CA was $11,015. The county assessed it at $812,436.

Closest homes

More homes in Alameda 94501

Assigned schools

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