Google street view image for 21378 Rizzo Ave, Castro Valley, CA 94546

Off market jan 2008 for $407K

$892,048

Est. refi paymentEst. refi $3,861/mo

•

1,237

sq ft

21378 Rizzo Ave, Castro Valley, CA 94546

About this home

Single-familyProperty Type

1946Year Built

6,256 sq ftLot Size

$721Est. Price/Sq.Ft.

1 spaceParking

Listed by Mike Southwick •DRE #01019265 • Mike Southwick, RE Broker

Bought with Wendy Brown •DRE #00876622 • Empire Realty Associates

Redfin checked: a minute ago

•Source:bridgeMLS, Bay East AOR, or Contra Costa AOR #40313554

Redfin Estimate

$892,048

$485K since sold in January 2008$3,000 since September

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 5.3% lower than the average sale price ($942K) of 6 comparable homes.

SOLD JUL 9, 2026
$984,777
A
3 beds2 baths1,650 sq ft
21451 Rizzo Ave, Castro Valley, CA 94546
SOLD JUL 28, 2026
$844,500
B
3 beds2 baths1,586 sq ft
2305 Star Ave, Castro Valley, CA 94546
SOLD JUL 20, 2026
$1,045,000
C
3 beds2 baths1,314 sq ft
3228 Kerr St, Castro Valley, CA 94546
SOLD APR 1, 2026
$910,000
D
3 beds2 baths1,185 sq ft
21330 Tyee St, Castro Valley, CA 94546
SOLD SEP 24, 2026
$925,000
E
3 beds2 baths1,539 sq ft
20927 Nunes Ave, Castro Valley, CA 94546
SOLD AUG 28, 2026
$940,000
F
3 beds2 baths1,262 sq ft
2337 Bentley Ct, Castro Valley, CA 94546

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Earn from this home

Sell

$675,840

Est. take-home

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Refinance

Est. cash available

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Rent

$3,620/mo

Redfin rental estimate

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Market trends in 94546, CA

Last updated September 2026

Buyer's Market

Seller's Market

Seller's market

Sale-to-List Price

103.4%

0.6% MoM

Median sale price

$1.1M

$823 MoM

Avg. days on market

18d

3 days MoM

Recently sold homes

7 MoM

New listings for sale

OPEN WED, 10AM TO 1PM
$1,249,000
3 beds2 baths1,731 sq ft
19431 Garrison Ave, Castro Valley, CA 94546
$549,988
3 beds2 baths1,354 sq ft
21239 Gary Dr #518, Hayward, CA 94546
OPEN SUN, 12PM TO 3PM
$895,000
3 beds2 baths1,509 sq ft
17494 Ehle St, Castro Valley, CA 94546
3D WALKTHROUGH
$699,900
2 beds1 bath1,188 sq ft
2223 Lessley Ave, Castro Valley, CA 94546
$2,600,000
5 beds6 baths4,216 sq ft
4683 Proctor Rd, Castro Valley, CA 94546
$1,490,000
4 beds2 baths1,916 sq ft
4475 Hillsborough Dr, Castro Valley, CA 94546
3D & VIDEO TOUR
$949,000
3 beds2.5 baths1,918 sq ft
20061 Santa Maria Ave, Castro Valley, CA 94546
3D & VIDEO TOUR
$1,188,000
4 beds2.5 baths2,295 sq ft
2783 Jennifer Dr, Castro Valley, CA 94546
OPEN SAT, 2PM TO 4PM
$1,175,000
3 beds2 baths1,795 sq ft
19563 Helen Pl, Castro Valley, CA 94546
$1,200,000
4 beds3 baths1,897 sq ft
18153 Judy St, Castro Valley, CA 94546
See all

Provided by Redfin

Sale history for 21378 Rizzo Ave

Date

Event

Price

bridgeMLS, Bay East AOR, or Contra Costa AOR #40313554

Jan 24, 2008

Sold

$407,500

$329/sq ft

Dec 29, 2007

Listing Removed

—

Dec 12, 2007

Listed

$409,000

$331/sq ft

bridgeMLS, Bay East AOR, or Contra Costa AOR #40260435

May 25, 2007

Listing Removed

—

bridgeMLS, Bay East AOR, or Contra Costa AOR #40154656

Jun 21, 2006

Sold

$572,000

$462/sq ft

May 12, 2006

Listing Removed

—

Mar 31, 2006

Listed

$559,950

$453/sq ft

Year

Property tax

Land + Additions

Assessment*

2025

$7,263 (+2.6%)

$163,777 + $382,146

$545,923

2024

$7,081 (+1.9%)

$160,566 + $374,655

$535,221

2023

$6,947 (+2.4%)

$157,418 + $367,310

$524,728

2022

$6,787 (+1.1%)

$151,307 + $353,051

$504,358

2021

$6,711 (+1.3%)

$151,307 + $353,051

$504,358

2020

$6,623 (−0.7%)

$148,341 + $346,130

$494,471

2019

$6,670 (+6.4%)

$146,821 + $342,582

$489,403

2018

$6,267 (+2.5%)

$143,943 + $335,867

$479,810

2017

$6,111 (+6.0%)

$138,355 + $322,828

$461,183

2016

$5,765 (+2.6%)

$138,355 + $322,828

$461,183

2015

$5,617 (+5.7%)

$135,642 + $316,499

$452,141

2014

$5,314 (+19.7%)

$130,989 + $305,642

$436,631

2013

$4,441 (+8.4%)

$130,989 + $305,642

$436,631

2012

$4,098 (+5.8%)

$108,000 + $252,000

$360,000

2011

$3,872 (−8.9%)

$99,000 + $231,000

$330,000

2010

$4,249 (+9.6%)

$93,000 + $217,000

$310,000

2009

$3,877 (−30.8%)

$105,000 + $245,000

$350,000

2008

$5,599

$93,600 + $218,400

$312,000

Tax history for 21378 Rizzo Ave

Year

Property tax

Land + Additions

Assessment*

2025

$7,263 (+2.6%)

$163,777 + $382,146

$545,923

2024

$7,081 (+1.9%)

$160,566 + $374,655

$535,221

2023

$6,947 (+2.4%)

$157,418 + $367,310

$524,728

2022

$6,787 (+1.1%)

$151,307 + $353,051

$504,358

2021

$6,711 (+1.3%)

$151,307 + $353,051

$504,358

2020

$6,623 (−0.7%)

$148,341 + $346,130

$494,471

2019

$6,670 (+6.4%)

$146,821 + $342,582

$489,403

2018

$6,267 (+2.5%)

$143,943 + $335,867

$479,810

2017

$6,111 (+6.0%)

$138,355 + $322,828

$461,183

2016

$5,765 (+2.6%)

$138,355 + $322,828

$461,183

2015

$5,617 (+5.7%)

$135,642 + $316,499

$452,141

2014

$5,314 (+19.7%)

$130,989 + $305,642

$436,631

2013

$4,441 (+8.4%)

$130,989 + $305,642

$436,631

2012

$4,098 (+5.8%)

$108,000 + $252,000

$360,000

2011

$3,872 (−8.9%)

$99,000 + $231,000

$330,000

2010

$4,249 (+9.6%)

$93,000 + $217,000

$310,000

2009

$3,877 (−30.8%)

$105,000 + $245,000

$350,000

2008

$5,599

$93,600 + $218,400

$312,000

*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.

Public record

Public record
Zoning
Permits

Beds

Baths

Stories

Lot width

—

Lot depth

—

Lot size

6,256 Sq. Ft.

Year renovated

1946

Sq. Ft.

1,300

Year built

1946

Style

Single Family Residential

County

Alameda County

APN

415 006003900

Parking Spaces

—

Basement

—

Accessible

—

HOA Dues

—

Garage

—

Features

—

Last updated by owner on Sep 16, 2026.

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

Aug 21, 2020 • Final

Reroof - single family residential

Remove existing wood shingles and shakes from a residential building. Install a new plywood roof deck and composition asphalt shingles.

Roofing

Dec 13, 2017 • Final

Building

Legalize a bathroom addition.

Addition

Bathroom

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

Parking

Parking Information
Parking Features: Converted Garage

Interior

Bathroom Information
# of Bathrooms Total: 2
# of Bathrooms Full: 2

Interior Features
Interior Features: Bonus/Plus Room
Laundry Features: In Unit
Street Level Features: 3 Bedrooms, 2 Baths
Fireplaces Total: 1
Has Fireplace
Flooring: Hardwood, Linoleum

Room Information
Kitchen Features: Other
Rooms Total: 6
Fireplace Features: Wood Burning

Exterior

Building Information
Construction Materials: Stucco
Building Area Total: 1,237

Exterior Features
Exterior Features: Back Yard, Front Yard
Roof: Shingle

Property Information
Living Area: 1237
Living Area Units: Square Feet
Property Type: Residential
Property Sub Type: Single Family Residence
Year Built: 1946

Lot Information
Lot Size Square Feet: 6256
Lot Size Area: 0.14
Lot Size Units: Acres
Lot Size Acres: 0.14
Lot Features: Regular
Zoning: 1001

Utilities

Utility Information
Water Source: Public
Sewer: Public Sewer

Heating & Cooling
Has Heating
Heating: Forced Air
Cooling: No Air Conditioning

Location

School Information
High School District: Hayward (510) 784-2600

Public facts

Beds: 3
Baths: 2.0
Sq. Ft.: 1,300
Stories: 1.0
Lot Size: 6,256 square feet
Style: Single Family Residential
Year Built: 1946
Year Renovated: 1946
County: Alameda County
APN: 415 006003900

Home facts updated by county records on Sep 16, 2026

Around this home

Schools

Fairview Elementary School

Public K-6 • Assigned • 1.6mi

2/10

Bret Harte Middle School

Public 7-8 • Assigned • 1.4mi

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 fall market offers great buyer leverage. While median prices hold steady around $1.2M, increased inventory gives you room to negotiate on homes needing updates. Turnkey properties still move fast in under 15 days, so act quickly with...
3 weeks ago • Castro Valley
Johnny Singh
Redfin Premier agent
148 deals
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Climate risks

1/10 Flood Factor

Minimal risk of a flood reaching the building in the next 30 years

1/10 Fire Factor

Unlikely to be in a wildfire in next 30 years

4/10 Heat Factor

7 days above 88° expected this year, 14 days in 30 years

1/10 Wind Factor

Minimal risk of severe winds over next 30 years

7/10 Air Factor

12 unhealthy days expected this year, 12 days in 30 years

Provided by First Street

Historical weather

Castro Valley, CA • 94546

Average low and high temperatures (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sun exposure

In this area, properties receive around 11.2 hours in June and 4.9 hours in December, placing it above the U.S. average for solar exposure.

11.2 hrs

4.9 hrs

JuneDecember

Provided by Shadowmap

Estimated sale price

$848,000 – $1.03M

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Home values near 21378 Rizzo Ave

Data from public records.

Address	Redfin Estimate
21348 Rizzo Ave, Castro Valley, CA 2 Beds \| 1 Baths \| 1100 Sq. Ft.	$829,537
21337 Rizzo Ave, Castro Valley, CA 3 Beds \| 1 Baths \| 1100 Sq. Ft.	$899,408

Address	Redfin Estimate
21366 Rizzo Ave, Castro Valley, CA 3 Beds \| 1 Baths \| 1531 Sq. Ft.	$887,629
21367 Rizzo Ave, Castro Valley, CA 3 Beds \| 1 Baths \| 1245 Sq. Ft.	$883,368

Address	Redfin Estimate
21360 Rizzo Ave, Castro Valley, CA 3 Beds \| 2 Baths \| 1371 Sq. Ft.	$975,169
21409 Rizzo Ave, Castro Valley, CA 3 Beds \| 2 Baths \| 1633 Sq. Ft.	$1,014,807

Property information provided by bridgeMLS, Bay East AOR, or Contra Costa AOR when last listed in 2007. This data may not match . Learn more.

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GreatSchools Ratings provided by GreatSchools.org.

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About this home

Redfin Estimate

Earn from this home

Market trends in 94546, CA

Sale history for 21378 Rizzo Ave

Tax history for 21378 Rizzo Ave

Public record

Property details

Around this home

Schools

Lifestyle

Local insights from Redfin agents

Climate risks

Historical weather

Sun exposure

Nearby similar homes

New listings for sale in 94546

Home values near 21378 Rizzo Ave

More real estate resources