21445 Rizzo Ave is a 1,356 square foot house on a 6,480 square foot lot with 2 bedrooms and 1 bathroom. Based on Redfin's Castro Valley data, we estimate the home's value is $855,567.
Single-familyProperty Type
1942Year Built
6,480 sq ftLot Size
$631Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$855,567
$7,000 since July
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 1.2% higher than the average sale price ($846K) of 6 comparable homes.
As the MLS and public records start to fill up, we'll list the details here.
Year
Property tax
Land + Additions
Assessment*
2025
$1,724 (+3.2%)
$36,286 + $32,853
$69,139
2024
$1,670 (+3.2%)
$36,286 + $32,853
$69,139
2023
$1,619 (+3.4%)
$35,575 + $32,209
$67,784
2022
$1,566 (+2.2%)
$34,193 + $30,959
$65,152
2021
$1,532 (+1.9%)
$34,193 + $30,959
$65,152
2020
$1,503 (−0.2%)
$33,523 + $30,352
$63,875
2019
$1,506 (+4.7%)
$33,179 + $30,041
$63,220
2018
$1,438 (+2.7%)
$32,529 + $29,452
$61,981
2017
$1,400 (+7.5%)
$31,266 + $28,308
$59,574
2016
$1,303 (+4.3%)
$31,266 + $28,308
$59,574
2015
$1,249 (+5.9%)
$30,653 + $27,753
$58,406
2014
$1,179 (+3.1%)
$29,601 + $26,801
$56,402
2013
$1,143 (+3.0%)
$29,601 + $26,801
$56,402
2012
$1,110 (+6.7%)
$29,467 + $26,680
$56,147
2011
$1,040 (+2.0%)
$28,889 + $26,157
$55,046
2010
$1,020 (+0.3%)
$28,323 + $25,644
$53,967
2009
$1,017 (+8.1%)
$28,111 + $25,452
$53,563
2008
$941
$28,178 + $25,513
$53,691
Tax history for 21445 Rizzo Ave
Year
Property tax
Land + Additions
Assessment*
2025
$1,724 (+3.2%)
$36,286 + $32,853
$69,139
2024
$1,670 (+3.2%)
$36,286 + $32,853
$69,139
2023
$1,619 (+3.4%)
$35,575 + $32,209
$67,784
2022
$1,566 (+2.2%)
$34,193 + $30,959
$65,152
2021
$1,532 (+1.9%)
$34,193 + $30,959
$65,152
2020
$1,503 (−0.2%)
$33,523 + $30,352
$63,875
2019
$1,506 (+4.7%)
$33,179 + $30,041
$63,220
2018
$1,438 (+2.7%)
$32,529 + $29,452
$61,981
2017
$1,400 (+7.5%)
$31,266 + $28,308
$59,574
2016
$1,303 (+4.3%)
$31,266 + $28,308
$59,574
2015
$1,249 (+5.9%)
$30,653 + $27,753
$58,406
2014
$1,179 (+3.1%)
$29,601 + $26,801
$56,402
2013
$1,143 (+3.0%)
$29,601 + $26,801
$56,402
2012
$1,110 (+6.7%)
$29,467 + $26,680
$56,147
2011
$1,040 (+2.0%)
$28,889 + $26,157
$55,046
2010
$1,020 (+0.3%)
$28,323 + $25,644
$53,967
2009
$1,017 (+8.1%)
$28,111 + $25,452
$53,563
2008
$941
$28,178 + $25,513
$53,691
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning and permits
Zoning
Permits
R1
Single-Family Residence Districts
Single-family residence districts, hereinafter designated as R-1 districts, are established to provide for and protect established neighborhoods of one-family dwellings, and to provide space in suitable locations for additional development of this kind, together with appropriate community facilities and allowance for restricted interim cultivation of the soil compatible with such low-density residential development.
Permitted uses
Include but are not limited to:
Housing-Single unit
Agriculture-Cropland
Agriculture-Grove / orchard
Apr 27, 2006 • Final
Building
Investigate a small area of the roof to determine the cause of damage.
Roofing
Jul 27, 2005 • Final
Building
Remove existing tar and gravel roofing and apply a new foam roofing application to the flat area on the back side of the single-family home.
Roofing
Permit history is from public records and may be incomplete or inaccurate. Redfin and its agents make no representations about the property condition or permit status. Buyers should independently verify all information.
Property details
Interior
Room Information
# of Rooms: 7
Exterior
Exterior Information
Building Style Type: Rectangular Design
Construction Type: Wood
Building Construction Quality: Average
Property Information
Living Sq. Ft: 1,356
Building Sq. Ft: 1,356
# of Units: 1
# of Stories: 2
Lot Information
# of Buildings: 1
Land Sq. Ft: 6,480
Legal Lot Number: 13
Municipality Name: HAYWARD UNINCORP
Acres: 0.1488
County Use Description: SINGLE FAMILY RESIDENTIAL HOME
Financial
Assessor Information
Assessment Year: 2025
Public facts
Beds: 2
Baths: 1.0
Sq. Ft.: 1,356
Stories: 2.0
Lot Size: 6,480 square feet
Style: Single Family Residential
Year Built: 1942
Year Renovated: 1942
County: Alameda County
APN: 415 006006600
Home facts updated by county records on Jul 27, 2026
Around this home
Schools
Fairview Elementary School
Public K-6 • Assigned • 1.6mi
2/10
Bret Harte Middle School
Public 7-8 • Assigned • 1.3mi
4/10
Hayward High School
Public 9-12 • Assigned • 1.4mi
5/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Local insights from Redfin agents
Castro Valley's late-summer market shows a clear split. While median prices hold near $1.2M, increased inventory gives buyers leverage on older properties. However, immaculate homes still go pending in under 15 days. A strong, clean offer is key!
Strong buyer demand keeps the Castro Valley market moving incredibly fast. With homes frequently selling above their $1.2 million median price, decisive action is essential. To win here, buyers need to submit competitive offers quickly and minimize...