Alameda County  »  94546  »  Topaz CT  »  20057 Topaz CT

20057 Topaz Court, Castro Valley, CA 94546 - Property report

Also known as: 20057 Topaz CT

Property image for 20057 Topaz Court, Castro Valley, CA 94546
static Mapbox map

Property type

2 Units, Single Family Residence with Attached Accessory Dwelling Unit (2501)

Year built

1947

Acreage

0.14

Sale price

$569,000

General Information

Address
Primary address
20057 Topaz Ct
Castro Valley, CA 94546
Zip code
94546
County
Alameda
Parcel ID
84C-669-48

Owner

Find out who owns 20057 Topaz Court, Castro Valley, CA 94546. Uncover corporate and individual owners with a free account.

Sales
Sale date
08/24/2006
Sale price
$569,000
Arm's length
Tax
Tax year
2025-2026
Property tax
$8,707
Tax per sq. ft.
$7
Building
Property type
2 Units, Single Family Residence with Attached Accessory Dwelling Unit
Building sq. ft.
1,289
Stories
1
Year built
1947
Building material
Wood/wood and steel frames
Rooms
7
Elevator
Bedrooms
3
Bathrooms
2
Lot
Acreage
0.14
Zoning & use
Zoning
Single Family Residential (R1-CSU-RV)
Units
1

Area overview

Walk score
63 /100.  Somewhat Walkable
Transit score
35 /100.  Some Transit
Bike score
43 /100.  Somewhat Bikeable
School district
CASTRO VLY UNIF SCH
Ownership

Ownership information for 20057 Topaz Court, Castro Valley, CA

Property owner name
Registered owner
Source
Deed
Owner contact information
Phone number
Owner address
Documents

Sales history for 20057 Topaz Court, Castro Valley, CA 94546

Sale date Sale price Buyer name Seller name
08/24/2006 $569,000 XXXX, XXXX XXXX, XXXXXX X X
08/24/2006 $121,000 XXXX, XXXXXX X X XXXX, XXXX X
08/03/2000 $284,000 XXXX, XXXX X XXXX XXXXXXX, XXXXX & XXXXXXX

*Most recent sales on record for this property.

More about Alameda County property records.

Title documents

Date Type Amount Party 1 Party 2
04/19/2017 Reconveyance
Substitution of Trustee		 XXXX XXXX X XXX XXXXXXXXXX XXXX
12/22/2016 Deed of Trust XXXXXXXX XXXX XXXXXXXXXXX XX XXX XXXXX XXXXXXXX XXXX
12/22/2016 Grant Deed XXXX XXXX XXXXXXXX XXXX XXXXXXXXXXX XX XXX
02/07/2014 Assignment of Rents XXXX XXXX XXX XXXXXXXXXX XXXX
02/07/2014 Deed of Trust XXXX XXXX XXX XXXXXXXXXX XXXX
09/25/2012 Deed of Trust XXXX XXXX XXXX
09/25/2012 Reconveyance
Substitution of Trustee		 XXXXX XXXXX XXXXXXXXX XXX XXXX XXXXX
09/25/2012 Reconveyance
Substitution of Trustee		 XXXXX XXXXX XXXXXXXXX XXX XXXXXX XXXXXXX
08/24/2006 Deed XXXX, XXXXXX X X XXXX, XXXX
08/24/2006 Deed XXXX, XXXX X XXXX, XXXXXX X X

*Most recent recorded documents on file for this property.

R: Recorded date
D: Document date

Tax

Property taxes for 20057 Topaz Court, Castro Valley, CA

Property tax data includes tax amount, market value and assessed value, exemptions, abatements and assessment history.

Current property tax
Tax year
2025-2026
Property tax
$8,707
Tax per sq. ft.
$7
Recent tax assessments
Market value
$748,002
Land value
$107,387
Building value
$640,615

More about Alameda County property taxes

Assessment history

See the assessment and property tax history, including the evolution of the total tax rate and corresponding property tax amount.

Tax year Assessed value Tax rate Property tax Y-o-Y change
2025-2026 $748,002 1.164 $8,707 +0.69%
2024-2025 $733,338 1.1791 $8,647 -37.34%
2023-2024 $587,060 2.3508 $13,801 +189.51%
2022-2023 $400,314 1.1908 $4,767 +21.67%
2021-2022 $330,701 1.1848 $3,918 +2.28%
2020-2021 $327,313 1.1703 $3,831 -1.51%
2019-2020 $320,898 1.212 $3,889 +2.36%
2018-2019 $314,608 1.2077 $3,800 +2.65%
2017-2018 $308,440 1.2001 $3,702 +18.55%
2016-2017 $302,393 1.0326 $3,123 -5.16%
Permits

Permit information for 20057 Topaz Court, Castro Valley, CA

No recently recorded permits for this property.

Neighborhood

Castro Valley residential market stats

Access a detailed real estate market overview of Castro Valley so you can assess current trends, home values, types of properties sold and transaction volume. View the median home sale price in Castro Valley and compare it to other neighborhoods in Alameda.

Median sale price

$1,013,750

-2.9% Y-o-Y

Median price/sq. ft.

$619

-9.8% Y-o-Y

Alameda county median sale price

$955,000

-6.4% Y-o-Y

Check out recently sold homes in Castro Valley and see how their prices compare.

Risk

Create a free account to unlock expanded risk information, such as crime incidents in the area, tsunami and landslides risks, or its location relative to FEMA flood zones and the Coastal Barriers Resources System Area (COBRA).

FEMA flood zones

FEMA flood zones
X
Landslides and liquefaction map

Fire hazard zones

Faults and tsunami inundation zones map

Transportation

Daily traffic map
View daily traffic map

Access the detailed traffic volume map for 20057 Topaz Court, Castro Valley, CA 94546 to see estimated average daily traffic on streets surrounding the property as well as the types of properties in its vicinity.

Schools

Nearest elementary schools

Name Rating Type Grade range No of students Distance (miles)
Marshall Elementary School 9 Public K-5 491 0.08
Early Bird Montessori School NR Private PK, K-1 30 0.41
Early Bird Montessori School NR Private PK, K-1 30 0.41
Vannoy Elementary School 7 Public K-5 441 0.70
Redwood Christian Elementary School NR Private K-5 282 0.72
Independent Elementary School 8 Public K-5 634 0.76
Castro Valley Adult And Career Education NR Public 0 0.78
Redwood Christian Schools NR Private K-12 706 0.80
Special Education-Preschool-Laurel NR Public 1 0.80
Alma Preschool NR Public 52 0.81
Nearest middle schools

Name Rating Type Grade range No of students Distance (miles)
Creekside Middle School 8 Public 6-8 760 0.23
Castro Valley Adult And Career Education NR Public 0 0.78
Redwood Christian Schools NR Private K-12 706 0.80
Special Education-Preschool-Laurel NR Public 1 0.80
Alma Preschool NR Public 52 0.81
Northstar School NR Private PK-8 152 0.87
Canyon Middle School 6 Public 6-8 1,332 0.87
Our Lady Of Grace School NR Private K-8 218 1.04
Anchor Education, Inc. NR Private 3-12 18 1.45
Sterling West San Francisco Campus NR Private 3-11 27 1.47
Nearest high schools

Name Rating Type Grade range No of students Distance (miles)
Castro Valley Adult And Career Education NR Public 0 0.78
Redwood Christian Schools NR Private K-12 706 0.80
Special Education-Preschool-Laurel NR Public 1 0.80
Alma Preschool NR Public 52 0.81
Castro Valley High School 9 Public 9-12 2,799 0.88
Anchor Education, Inc. NR Private 3-12 18 1.45
Sterling West San Francisco Campus NR Private 3-11 27 1.47
Anchor Education, Inc. School NR Private 3-12 0 1.47
Stellar Preparatory High School NR Private 9 0 1.49
Roy A. Johnson High School NR Public 9-12 24 1.82

Data provided by GreatSchools.org © 2026. All rights reserved.

Neighbors for 20057 Topaz Court, Castro Valley, CA

4247 Gem Ave, Castro Valley 20020 Onyx CT, Castro Valley 20055 Onyx CT, Castro Valley 20076 Onyx CT, Castro Valley 20054 Onyx CT, Castro Valley 4271 Gem Ave, Castro Valley 4207 Gem Ave, Castro Valley 4210 Gem Ave, Castro Valley 20022 Topaz CT, Castro Valley 4253 Gem Ave, Castro Valley 4226 Gem Ave, Castro Valley 4238 Gem Ave, Castro Valley 20056 Topaz CT, Castro Valley 20059 Garnet CT, Castro Valley 4204 Gem Ave, Castro Valley 4272 Gem Ave, Castro Valley 4277 Gem Ave, Castro Valley 4216 Gem Ave, Castro Valley 4222 Gem Ave, Castro Valley 4232 Gem Ave, Castro Valley

Nearby ZIP codes for 20057 Topaz Court, Castro Valley, CA

94542, Alameda County, CA 94579, Alameda County, CA 94601, Alameda County, CA 94613, Alameda County, CA 94619, Alameda County, CA

Frequently asked questions

What is the year built for 20057 Topaz Court, Castro Valley, CA 94546?

The development at 20057 Topaz Court, Castro Valley, CA 94546 was built in 1947.

What is the total square footage of 20057 Topaz Court, Castro Valley, CA 94546?

20057 Topaz Court, Castro Valley, CA 94546 has a total of 1,289 square feet.

When was 20057 Topaz Court, Castro Valley, CA 94546 last sold and what was the sale price?

20057 Topaz Court, Castro Valley, CA 94546 was last sold on 08/24/2006 for $569,000.

What is the assessed value of 20057 Topaz Court, Castro Valley, CA 94546?

20057 Topaz Court, Castro Valley, CA 94546 is currently assessed at $748,002.

What are the property taxes for 20057 Topaz Court, Castro Valley, CA 94546?

The property taxes for 20057 Topaz Court, Castro Valley, CA 94546 total $8,706.

How many residential units does this building have?

This building has 1 residential unit(s).

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