Alameda County  »  94546  »  Gem CT  »  20031 Gem CT

20031 Gem Court, Castro Valley, CA 94546 - Property report

Also known as: 20031 Gem CT

Property image for 20031 Gem Court, Castro Valley, CA 94546
static Mapbox map

Property type

Single Family Residential Homes Used as Such (1100)

Year built

1950

Acreage

2.04

Sale price

$1,100,000

General Information

Address
Primary address
20031 Gem Ct
Castro Valley, CA 94546
Zip code
94546
County
Alameda
Parcel ID
84C-1064-58

Owner

Find out who owns 20031 Gem Court, Castro Valley, CA 94546. Uncover corporate and individual owners with a free account.

Sales
Sale date
08/20/2024
Sale price
$1,100,000
Arm's length
Tax
Tax year
2026-2027
Base tax
$13,060
Current property tax
$12,979
Tax per sq. ft.
$6
Building
Property type
Single Family Residential Homes Used as Such
Building sq. ft.
2,032
Stories
20
Year built
1950
Building material
Wood/wood and steel frames
Last altered
1969
Rooms
8
Elevator
Bedrooms
4
Bathrooms
25
Lot
Acreage
2.04
Zoning & use
Zoning
Single Family Residential (R1-CSU-RV)
Units
1

Area overview

Walk score
56 /100.  Somewhat Walkable
Transit score
29 /100.  Some Transit
Bike score
33 /100.  Somewhat Bikeable
School district
CASTRO VLY UNIF SCH
Ownership

Ownership information for 20031 Gem Court, Castro Valley, CA

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

Sales history for 20031 Gem Court, Castro Valley, CA 94546

Sale date Sale price Buyer name Seller name
08/20/2024 $1,100,000 XXXXXX XXXXX; XXXXXX XXXXXXX XXXXXXXX XXXXXXX X XX; XXXXXXX XXXXXX XXX XX; XXXXXXXX XXXX XXXXX; XXXXXXXX XXXX XX; XXXXXXXX XXXXX XXXXXX XX; XXXXXXXX XXXXXX XXXXX; XXXXXXXX XXXXXXX X XX
06/16/2000 $320,000 XXXXXXXX, XXXXXXX X & XXXXXXX X XX XXXXXXX XXXXX
02/15/2000 $190,900 XXXXXXX XXXXX XXXXXX, XXXXXX X & XXXX X

*Most recent sales on record for this property.

More about Alameda County property records.

Title documents

Date Type Amount Party 1 Party 2
09/04/2025 Ucc fin stmt(3&+pgs) XXXXXX XXXXX XXXXX XXXX
08/20/2024 Deed of trust XXXXXX XXXXX XXXXX XXXXX XXXX X X
08/20/2024 Grant Deed XXXXXXXX XXXXXXX X XX XXXXXX XXXXX
06/12/2008 Deed XXXXXXXX, XXXX XXXXXXXX XXXX XXXXX
08/12/2003 Deed XXXXXXXX, XXXXX & XXXXXX XXXXXXXX, XX
06/16/2000 Deed XXXXXXX XXXXX XXXXXXXX, XXXXXXX X & XXXXXXX X XX
02/15/2000 Deed XXXXXX, XXXXXX X & XXXX X XXXXXXX XXXXX

*Most recent recorded documents on file for this property.

R: Recorded date
D: Document date

Tax

Property taxes for 20031 Gem 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
2026-2027
Base tax
$13,060
Current property tax
$12,979
Tax per sq. ft.
$6
Recent tax assessments
Market value
$1,122,000
Land value
$336,600
Building value
$785,400

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 $1,100,000 1.164 $12,804 +125.22%
2024-2025 $482,163 1.1791 $5,685 -48.84%
2023-2024 $472,710 2.3508 $11,112 +101.36%
2022-2023 $463,443 1.1908 $5,519 +2.52%
2021-2022 $454,358 1.1848 $5,383 +2.28%
2020-2021 $449,702 1.1703 $5,263 -1.99%
2019-2020 $440,886 1.218 $5,370 +2.87%
2018-2019 $432,243 1.2077 $5,220 +2.65%
2017-2018 $423,769 1.2001 $5,086 +18.18%
2016-2017 $415,462 1.0358 $4,303 -4.87%
Permits

Permit information for 20031 Gem Court, Castro Valley, CA

Issued date Permit number Permit type Sub type Valuation Finaled date Status
05/13/2025
03/11/2025
11/23/2024
09/26/2024

*Most recent permits on record 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 20031 Gem 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)
Independent Elementary School 8 Public K-5 634 0.42
Marshall Elementary School 9 Public K-5 491 0.44
Early Bird Montessori School NR Private PK, K-1 30 0.52
Early Bird Montessori School NR Private PK, K-1 30 0.52
Northstar School NR Private PK-8 152 0.62
Northstar School NR Private PK-8 152 0.62
Vannoy Elementary School 7 Public K-5 441 0.72
Special Education-Preschool-Laurel NR Public 1 0.95
Redwood Christian Elementary School NR Private K-5 282 1.02
Castro Valley Adult And Career Education NR Public 0 1.04
Nearest middle schools

Name Rating Type Grade range No of students Distance (miles)
Creekside Middle School 8 Public 6-8 760 0.24
Northstar School NR Private PK-8 152 0.62
Canyon Middle School 6 Public 6-8 1,332 0.68
Special Education-Preschool-Laurel NR Public 1 0.95
Castro Valley Adult And Career Education NR Public 0 1.04
Alma Preschool NR Public 52 1.07
Redwood Christian Schools NR Private K-12 706 1.09
Our Lady Of Grace School NR Private K-8 218 1.39
Liberty School NR Private 1-12 0 1.53
Stellar Preparatory High School NR Private 9 0 1.57
Nearest high schools

Name Rating Type Grade range No of students Distance (miles)
Special Education-Preschool-Laurel NR Public 1 0.95
Castro Valley Adult And Career Education NR Public 0 1.04
Alma Preschool NR Public 52 1.07
Redwood Christian Schools NR Private K-12 706 1.09
Castro Valley High School 9 Public 9-12 2,799 1.21
Liberty School NR Private 1-12 0 1.53
Stellar Preparatory High School NR Private 9 0 1.57
Anchor Education, Inc. NR Private 3-12 18 1.80
Sterling West San Francisco Campus NR Private 3-11 27 1.82
Hayward High School 5 Public 9-12 1,712 1.84

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

Neighbors for 20031 Gem Court, Castro Valley, CA

20025 Gem CT, Castro Valley 20321 Sapphire St, Castro Valley 4236 David St, Castro Valley 20058 Gem CT, Castro Valley 20036 Gem CT, Castro Valley 20030 Gem CT, Castro Valley 20077 Emerald CT, Castro Valley 20037 Gem CT, Castro Valley 4419 Gem Ave, Castro Valley 20024 Gem CT, Castro Valley 4748 Rollinghills Way, Castro Valley 4431 Gem Ave, Castro Valley 4458 Paradise Knls, Castro Valley 20076 Emerald CT, Castro Valley 20088 Emerald CT, Castro Valley 4393 Gem Ave, Castro Valley 20052 Center St, Castro Valley 4248 David St, Castro Valley 4224 David St, Castro Valley 5170 Proctor Rd, Castro Valley

Nearby ZIP codes for 20031 Gem Court, Castro Valley, CA

94541, Alameda County, CA 94542, Alameda County, CA 94544, Alameda County, CA 94545, Alameda County, CA 94552, Alameda County, CA 94577, Alameda County, CA 94578, Alameda County, CA 94579, Alameda County, CA 94580, Alameda County, CA 94601, Alameda County, CA 94603, Alameda County, CA 94605, Alameda County, CA 94613, Alameda County, CA 94619, Alameda County, CA 94621, Alameda County, CA

Frequently asked questions

What is the year built for 20031 Gem Court, Castro Valley, CA 94546?

The development at 20031 Gem Court, Castro Valley, CA 94546 was built in 1950.

What is the total square footage of 20031 Gem Court, Castro Valley, CA 94546?

20031 Gem Court, Castro Valley, CA 94546 has a total of 2,032 square feet.

When was 20031 Gem Court, Castro Valley, CA 94546 last sold and what was the sale price?

20031 Gem Court, Castro Valley, CA 94546 was last sold on 08/20/2024 for $1,100,000.

What is the assessed value of 20031 Gem Court, Castro Valley, CA 94546?

20031 Gem Court, Castro Valley, CA 94546 is currently assessed at $1,100,000.

What are the property taxes for 20031 Gem Court, Castro Valley, CA 94546?

The property taxes for 20031 Gem Court, Castro Valley, CA 94546 total $12,804.

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