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CondominiumResidential

20340 Forest Ave

CASTRO VALLEY, CA 94546
0.81 ac
Lot SizeThe size of the land the home sits on, from county records.
1993
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
2
ParkingThe number of parking spaces on the property, including the garage.
Built 199312 units1,372–1,700 ft²
$8.6M
All units combinedThe sum of our current value estimates for every unit in the building — roughly what the whole building's homes are worth together.
$694K
Median unit valueThe middle unit value in this building by our estimate: half the units are worth more, half less.
$495
Median $/ft²The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.

-22.1%vs the Castro Valley ZIP median sale $/ft² ($636)

Sales Performance

—
Median sale (12 mo)The middle sale price among this building's units that sold in the last 12 months, from recorded deeds.
—
1-yr changeHow the building's median sale price over the last 12 months compares with the 12 months before that.
0
Sales (12 mo)Units in this building that sold in the last 12 months, from recorded arms-length deeds.
0.0%
Turnover (12 mo)The share of units that changed hands in the last 12 months. Around 4–6% a year is typical; much higher can signal investor churn or a wave of exits.
This building's own appreciationThe building's own appreciation: for every unit that sold twice (held over a year), we compute its yearly price change between the two sales and take the middle value. This is the cleanest read on how this specific building performs, because it compares each unit to itself.
+3.1%per yeartypical hold 5.1 yrsfrom 12 same-unit resales
Median sale price (yearly, all time)Every recorded arms-length sale in the building since records begin, grouped by year: the bars count sales and the line tracks the median price paid.MedianSales
19941998200120042007201020212025
Sale price per ft² (yearly, all time)The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.$/ft²
19941998200120042007201020212025

22 arms-length sales on record for this building.

Unit Mix & Floor PlansThe building's recurring floor plans, found by grouping units with identical beds, baths and square footage in county records. Larger groups are the building's standard layouts; leftover units have one-off sizes.

Every unit: size vs estimated valueEvery unit in the building as one dot: across is its size, up is our current value estimate, and color is its bedroom count. Vertical columns of dots are recurring floor plans; the height spread within a column shows how much floor, view and condition move prices for the same layout.
$636K$707K$778K$849K1,372 ft²1,438 ft²1,503 ft²1,569 ft²1,634 ft²1,700 ft²
3 bd4+ bd
3 bed
10 units
4 bed
2 units
Recurring floor plansThe building's recurring floor plans, found by grouping units with identical beds, baths and square footage in county records. Larger groups are the building's standard layouts; leftover units have one-off sizes.
3 bd · 2.5 ba · 1,372 ft²
10 units
4 bd · 2.5 ba · 1,700 ft²
2 units

Value DistributionHow the building's units spread across value ranges by our current estimates. A wide spread usually means big differences in size, floor or view.

$636K–$643K
3 units
$678K–$688K
3 units
$700K–$700K
1 unit
$734K–$734K
1 unit
$774K–$790K
3 units
$849K–$849K
1 unit

Ownership & Financing

Owner-occupiedThe share of units where the owner lives in the unit, per county records. The rest are second homes or rentals.83%
Company-ownedUnits owned through an LLC, trust, or other company — a rough proxy for investor ownership.33%
Typical owner tenureThe middle number of years since each unit last changed hands — how long the current owners have been in place.17.1 yrs
Cash purchases (5 yrs)The share of purchases in the last 5 years with no mortgage recorded. High cash share is common in second-home and investor buildings.0%
Avg. loan-to-valueAverage current loan balance against unit value across the building. Low numbers mean owners hold lots of equity — a sign of financial stability.48%
Median owner equityThe middle dollar amount of equity (value minus loans) unit owners hold in this building.$784,877
Median tax billThe middle annual property tax bill among the building's units.$6,705
Pre-foreclosure noticesUnits with an active pre-foreclosure or foreclosure notice on file.0

Recent SalesThe latest recorded arms-length sales in the building, newest first.

Unit 7Jul 21, 2025$730,000Unit 8Dec 24, 2024$780,000Unit 9Jul 22, 2021$760,000Unit 4Nov 1, 2019$649,000Unit 1May 31, 2019$690,000Unit 6Nov 19, 2010$379,000Unit 2Sep 4, 2008$370,000Unit 4Apr 10, 2007$500,000Unit 2Jan 19, 2007$518,500Unit 4Jun 30, 2005$490,000

Values are TopHap estimates, not appraisals. Sales, ownership and tax figures come from recorded county documents via ATTOM and can lag by several weeks.

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.9 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.Condominium
CountyALAMEDA
Lot (acres)The size of the land the home sits on, from county records.0.81
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

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Marshall Elementary SchoolA
Elementary · Grades KG–5 · 0.1 mi
M
Creekside Middle SchoolA
Middle · Grades 6–8 · 0.5 mi
H
Castro Valley High SchoolA-
High · Grades 9–12 · 0.7 mi

District: Castro Valley Unified School District

Neighborhood · ZIP 94546These 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.91
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.657

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.27%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.9%
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.46,776
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,466 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$117,352
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$142,642
Average tempThe average temperature here across a full year.57°F
Annual precipHow much rain and melted snow falls here in a typical year.23 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.78%

All UnitsEvery property record the county has at this street address, such as the units in a condo building. Prices shown are our estimates, not asking prices.

20340 Forest Ave # 1
4 bd · 2.5 ba · 1,700 ft²
$786K
20340 Forest Ave
3 bd · 2.5 ba · 1,372 ft²
$681K
20340 Forest Ave
3 bd · 2.5 ba · 1,372 ft²
$688K
20340 Forest Ave
3 bd · 2.5 ba · 1,372 ft²
$849K
20340 Forest Ave # 5
3 bd · 2.5 ba · 1,372 ft²
$678K
20340 Forest Ave # 6
3 bd · 2.5 ba · 1,372 ft²
$640K
20340 Forest Ave # 7
3 bd · 2.5 ba · 1,372 ft²
$700K
20340 Forest Ave # 8
3 bd · 2.5 ba · 1,372 ft²
$734K
20340 Forest Ave # 9
3 bd · 2.5 ba · 1,372 ft²
$790K
20340 Forest Ave # 10
3 bd · 2.5 ba · 1,372 ft²
$643K
20340 Forest Ave # 11
3 bd · 2.5 ba · 1,372 ft²
$636K
20340 Forest Ave # 12
4 bd · 2.5 ba · 1,700 ft²
$774K

Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

About 20340 Forest Ave

How many units are in 20340 Forest Ave, Castro Valley, CA?

20340 Forest Ave, Castro Valley, CA has 12 residential units across built in 1993, according to county assessor records.

What is a unit at 20340 Forest Ave, Castro Valley, CA worth?

The median TopHap Estimate across the 12 units at 20340 Forest Ave, Castro Valley, CA is $693,972. That works out to $495 per square foot. Units run from 1,372 to 1,700 square feet. Estimates are modelled from recorded sales and assessments, not appraisals.

Is 20340 Forest Ave, Castro Valley, CA expensive for Castro Valley?

Units at 20340 Forest Ave, Castro Valley, CA carry a median of $495 per square foot, 22% below the Castro Valley median of $636 per square foot.

How often do units sell at 20340 Forest Ave, Castro Valley, CA?

0 units at 20340 Forest Ave, Castro Valley, CA sold in the last 12 months, out of 22 recorded arms-length sales all time. That is a turnover rate of 0.0% of the building per year.

Have units at 20340 Forest Ave, Castro Valley, CA appreciated?

Across 12 repeat sales of the same unit, 20340 Forest Ave, Castro Valley, CA returned a median 3.1% per year. Because each pair is the same unit bought and sold, the figure is not distorted by which units traded. The median owner held for 5.1 years.

What floor plans does 20340 Forest Ave, Castro Valley, CA have?

The most common plan at 20340 Forest Ave, Castro Valley, CA is a 3-bedroom of 1,372 square feet, repeated 10 times, with a median estimate of $684,862. TopHap identifies 2 recurring plans in the building.

More homes on Forest Ave

Closest homes

More homes in Castro Valley 94546

Assigned schools

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