Alameda County  »  94546  »  Gem Ave  »  4247 Gem Ave

4247 Gem Avenue, Castro Valley, CA 94546 - Property report

Also known as: 4247 Gem Ave

Property image for 4247 Gem Avenue, Castro Valley, CA 94546
static Mapbox map

Property type

Single Family Residential Homes Used as Such (1100)

Year built

1947

Acreage

0.13

Sale price

$755,000

General Information

Address
Primary address
4247 Gem Ave
Castro Valley, CA 94546
Zip code
94546
County
Alameda
Parcel ID
84C-669-53

Owner

Find out who owns 4247 Gem Avenue, Castro Valley, CA 94546. Uncover corporate and individual owners with a free account.

Sales
Sale date
07/29/2025
Sale price
$755,000
Arm's length
Tax
Tax year
2025-2026
Base tax
$2,152
Current property tax
$2,071
Tax per sq. ft.
$2
Building
Property type
Single Family Residential Homes Used as Such
Building sq. ft.
1,080
Stories
1
Year built
1947
Building material
Wood/wood and steel frames
Rooms
6
Elevator
Bedrooms
3
Bathrooms
1
Lot
Acreage
0.13
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 4247 Gem Avenue, Castro Valley, CA

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

Sales history for 4247 Gem Avenue, Castro Valley, CA 94546

Sale date Sale price Buyer name Seller name
07/29/2025 $755,000 XXXXXX XXXXXX XXX XXXXXXXX XXXXXX XX; XXXXXXXXX XXXXXX XXXXX

*Most recent sale on record for this property.

More about Alameda County property records.

Title documents

Date Type Amount Party 1 Party 2
07/29/2025 Deed of trust
Assignment of rents
Ucc fin stmt(1-2 pgs)		 XXXXXX XXXXXX XXX XXXXX XXXXXXX XXX
07/29/2025 Deed of trust
Assignment of rents
Ucc fin stmt(1-2 pgs)		 XXXXXX XXXXXX XXX XXXXX XXXXXXX XXX
07/29/2025 Grant Deed XXXXXXXX XXXXXX XX XXXXXX XXXXXX XXX
07/29/2025 Appointment of trustee XXXXXXXXX XXXXXX X XX XXXXXXXX XXXXXX XX

*Most recent recorded documents on file for this property.

R: Recorded date
D: Document date

Tax

Property taxes for 4247 Gem Avenue, 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
Base tax
$2,152
Current property tax
$2,071
Tax per sq. ft.
$2
Recent tax assessments
Market value
$184,908
Land value
$124,047
Building value
$60,861

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 $184,908 1.164 $2,152 +0.69%
2024-2025 $181,283 1.1791 $2,138 -48.84%
2023-2024 $177,729 2.3508 $4,178 +101.36%
2022-2023 $174,245 1.1908 $2,075 +2.52%
2021-2022 $170,829 1.1848 $2,024 +2.29%
2020-2021 $169,078 1.1703 $1,979 -1.51%
2019-2020 $165,764 1.212 $2,009 +2.36%
2018-2019 $162,514 1.2077 $1,963 +2.65%
2017-2018 $159,327 1.2001 $1,912 +18.54%
2016-2017 $156,204 1.0326 $1,613 -5.16%
Permits

Permit information for 4247 Gem Avenue, Castro Valley, CA

Issued date Permit number Permit type Sub type Valuation Finaled date Status

*Most recent permit 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 4247 Gem Avenue, 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 0.12
Early Bird Montessori School NR Private PK, K-1 30 0.39
Early Bird Montessori School NR Private PK, K-1 30 0.39
Vannoy Elementary School 7 Public K-5 441 0.68
Independent Elementary School 8 Public K-5 634 0.73
Redwood Christian Elementary School NR Private K-5 282 0.74
Castro Valley Adult And Career Education NR Public 0 0.79
Redwood Christian Schools NR Private K-12 706 0.81
Alma Preschool NR Public 52 0.82
Special Education-Preschool-Laurel NR Public 1 0.83
Nearest middle schools

Name Rating Type Grade range No of students Distance (miles)
Creekside Middle School 8 Public 6-8 760 0.19
Castro Valley Adult And Career Education NR Public 0 0.79
Redwood Christian Schools NR Private K-12 706 0.81
Alma Preschool NR Public 52 0.82
Special Education-Preschool-Laurel NR Public 1 0.83
Canyon Middle School 6 Public 6-8 1,332 0.83
Northstar School NR Private PK-8 152 0.85
Our Lady Of Grace School NR Private K-8 218 1.07
Anchor Education, Inc. NR Private 3-12 18 1.48
Sterling West San Francisco Campus NR Private 3-11 27 1.50
Nearest high schools

Name Rating Type Grade range No of students Distance (miles)
Castro Valley Adult And Career Education NR Public 0 0.79
Redwood Christian Schools NR Private K-12 706 0.81
Alma Preschool NR Public 52 0.82
Special Education-Preschool-Laurel NR Public 1 0.83
Castro Valley High School 9 Public 9-12 2,799 0.90
Anchor Education, Inc. NR Private 3-12 18 1.48
Sterling West San Francisco Campus NR Private 3-11 27 1.50
Anchor Education, Inc. School NR Private 3-12 0 1.50
Stellar Preparatory High School NR Private 9 0 1.52
Roy A. Johnson High School NR Public 9-12 24 1.85

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

Neighbors for 4247 Gem Avenue, Castro Valley, CA

20020 Onyx CT, Castro Valley 20053 Opal 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 4293 Gem Ave, Castro Valley 4210 Gem Ave, Castro Valley 4253 Gem Ave, Castro Valley 20022 Topaz CT, Castro Valley 4226 Gem Ave, Castro Valley 20075 Opal CT, Castro Valley 20056 Topaz CT, Castro Valley 20057 Topaz CT, Castro Valley 20059 Garnet CT, Castro Valley 4204 Gem Ave, Castro Valley 4277 Gem Ave, Castro Valley 4216 Gem Ave, Castro Valley 4222 Gem Ave, Castro Valley

Nearby ZIP codes for 4247 Gem Avenue, 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 4247 Gem Avenue, Castro Valley, CA 94546?

The development at 4247 Gem Avenue, Castro Valley, CA 94546 was built in 1947.

What is the total square footage of 4247 Gem Avenue, Castro Valley, CA 94546?

4247 Gem Avenue, Castro Valley, CA 94546 has a total of 1,080 square feet.

When was 4247 Gem Avenue, Castro Valley, CA 94546 last sold and what was the sale price?

4247 Gem Avenue, Castro Valley, CA 94546 was last sold on 07/29/2025 for $755,000.

What is the assessed value of 4247 Gem Avenue, Castro Valley, CA 94546?

4247 Gem Avenue, Castro Valley, CA 94546 is currently assessed at $184,908.

What are the property taxes for 4247 Gem Avenue, Castro Valley, CA 94546?

The property taxes for 4247 Gem Avenue, Castro Valley, CA 94546 total $2,152.

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