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Single Family ResidenceResidential
$2,076,140$635 / 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
Last sold for $1,300,000 on Nov 10, 2005

612 FORTRESS ISLE

ALAMEDA, CA 94501
4
Beds
4
Baths
3,271 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.
0.16 ac
Lot SizeThe size of the land the home sits on, from county records.
1963
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
13
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$2.1M
$2M low$2.2M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,300,000 · Nov 10, 2005
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.$676,140
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$540,912
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.66%
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.$1,400,000
Null Placeholder · 6.22% · recorded Apr 21, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$28,693 (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.$2,140,357 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$646,913
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$1,500,444
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$2,098,261
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,778,220

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.20 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.1970
Lot (acres)The size of the land the home sits on, from county records.0.16
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.Yes

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.

Foreclosure Filings(1)

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 · 0.2 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

612 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 97% of homes in Alameda 94501
  • Costs less per square foot than 68% of homes in Alameda 94501
  • Bigger than 93% of homes in Alameda County
  • Has a bigger lot than 71% of homes in Alameda 94501
  • Newer than 76% 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
$406K$2.2M

This home is worth more than 97% 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$2,076,140
CheaperTypical $1,113,947Pricier

Pricier than 97% of homes nearby

Price per ft²$635
CheaperTypical $717Pricier

Pricier than 32% of homes nearby

Living area3,271 ft²
SmallerTypical 1,658 ft²Bigger

Bigger than 91% of homes nearby

Lot size0.16 ac
SmallerTypical 0.11 acBigger

Bigger than 71% of homes nearby

Year built1963
OlderTypical 1932Newer

Newer than 68% of homes nearby

How 612 Fortress Isle ranks against every home in each area.
MeasureThis homeBronze CoastAlameda 94501Alameda County
Estimated valuepricier than$2,076,14092% of homes97% of homes92% of homes
Price per ft²pricier than$63547% of homes32% of homes44% of homes
Living areabigger than3,271 ft²80% of homes91% of homes93% of homes
Lot sizebigger than0.16 ac45% of homes71% of homes63% of homes
Year builtnewer than196376% of homes68% of homes50% of homes

About 612 Fortress Isle

How much is 612 Fortress Isle, Alameda, CA worth?

The TopHap Estimate for 612 Fortress Isle, Alameda, CA is $2,076,140 as of Jul 14, 2026. The likely range is $1,996,532 to $2,155,748. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 612 Fortress Isle, Alameda, CA last sell?

612 Fortress Isle, Alameda, CA last sold on Nov 10, 2005 for $1,300,000, according to the county's recorded deed.

How big is 612 Fortress Isle, Alameda, CA?

612 Fortress Isle, Alameda, CA has 4 bedrooms, 4 bathrooms, 3,271 square feet of living space and a 0.16-acre lot.

When was 612 Fortress Isle, Alameda, CA built?

612 Fortress Isle, Alameda, CA was built in 1963, making it 63 years old. The building has 2 stories.

What schools serve 612 Fortress Isle, Alameda, CA?

612 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 612 Fortress Isle, Alameda, CA compare to other homes in Alameda 94501?

Among the 14,890 homes in Alameda 94501, it is worth more than 97% of them ($2,076,140 against a typical $1,113,947), its price per square foot is higher than 32% of them ($635 against a typical $717), it is bigger than 91% of them (3,271 ft² against a typical 1,658 ft²), its lot is bigger than 71% of them (0.16 ac against a typical 0.11 ac) and it is newer than 68% of them (1963 against a typical 1932). Measured against all of Alameda County, it is worth more than 92% 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 612 Fortress Isle, Alameda, CA?

The 2025 property tax bill for 612 Fortress Isle, Alameda, CA was $28,693. The county assessed it at $2,140,357.

Closest homes

More homes in Alameda 94501

Assigned schools

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