Google street view image for 21735 Ada St, Castro Valley, CA 94546

Off market aug 2016 for $585K

$856,592

Est. refi paymentEst. refi $4,451/mo

•

1,170

sq ft

21735 Ada St, Castro Valley, CA 94546

About this home

Single-familyProperty Type

1947Year Built

6,030 sq ftLot Size

1 car garageParking

Listed by Danielle Keil •DRE #01280917 • KW Advisors East Bay

Listed by Rebecca Sayami •DRE #01461001 • Coldwell Banker Realty

Bought with Ines Eiras •DRE #00987307 • BHG Tri-Valley Realty

Redfin checked: a minute ago

•Source:bridgeMLS, Bay East AOR, or Contra Costa AOR #40746036

Redfin Estimate

$856,592

$272K since sold in August 2016$14K since October

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 3.7% higher than the average sale price ($826K) of 6 comparable homes.

SOLD OCT 22, 2026
$880,000
A
3 beds1 bath1,245 sq ft
21367 Rizzo Ave, Castro Valley, CA 94546
SOLD APR 3, 2026
$840,000
B
3 beds1 bath1,162 sq ft
2690 Watson St, Castro Valley, CA 94546
SOLD OCT 22, 2026
$822,000
C
2 beds1 bath1,188 sq ft
2220 Farley St, Castro Valley, CA 94546
SOLD APR 27, 2026
$768,000
D
3 beds1 bath871 sq ft
2226 Vegas Ave, Castro Valley, CA 94546
SOLD APR 22, 2026
$800,000
E
3 beds1.5 baths1,073 sq ft
2672 Watson St, Castro Valley, CA 94546
SOLD JUL 28, 2026
$844,500
F
3 beds2 baths1,586 sq ft
2305 Star Ave, Castro Valley, CA 94546

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Earn from this home

Sell

$446,221

Est. take-home

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Refinance

Est. cash available

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Rent

$3,269/mo

Redfin rental estimate

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Market trends in 94546, CA

Last updated October 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

COMING SOON
$925,000
3 beds1 bath1,088 sq ft
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COMING SOON
$879,000
3 beds1 bath1,106 sq ft
3443 Middleton Ave, Castro Valley, CA 94546
COMING SOON
$799,950
3 beds2 baths1,085 sq ft
Castro Valley, CA 94546
OPEN SAT, 1PM TO 4PM
$796,888
3 beds1 bath1,288 sq ft
2234 Grove Way, Castro Valley, CA 94546
$859,000
3 beds2 baths1,597 sq ft
3898 Link Ct, Castro Valley, CA 94546
OPEN SAT, 1PM TO 3PM
$75,000
1 bed1 bath528 sq ft
3913 Castro Valley Blvd #43, Castro Valley, CA 94546
eXp Realty of California Inc.
$799,000
2 beds1 bath902 sq ft
4011 Berdina Rd, Castro Valley, CA 94546
OPEN FRI, 5PM TO 7PM
$850,000
2 beds2 baths1,194 sq ft
20114 Normandy Ct, Castro Valley, CA 94546
$899,999
3 beds2 baths1,461 sq ft
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Vista Sotheby's International Realty
COMING SOON
$975,000
3 beds1.5 baths1,311 sq ft
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See all

Provided by Redfin

Sale history for 21735 Ada St

Date

Event

Price

bridgeMLS, Bay East AOR, or Contra Costa AOR #40746036

Aug 19, 2016

Sold

$585,000

$500/sq ft

Jul 3, 2016

Pending

—

Jun 22, 2016

Listed

bridgeMLS, Bay East AOR, or Contra Costa AOR #40666958

Aug 8, 2014

Listing Removed

—

bridgeMLS, Bay East AOR, or Contra Costa AOR #40027680

Aug 23, 2004

Sold

$445,500

$381/sq ft

Jul 21, 2004

Listing Removed

—

Jul 13, 2004

Listed

bridgeMLS, Bay East AOR, or Contra Costa AOR #11107531

Nov 16, 2001

Sold

$310,000

$265/sq ft

Oct 3, 2001

Listing Removed

—

Aug 7, 2001

Listed

Year

Property tax

Land + Additions

Assessment*

2025

$8,971 (+2.5%)

$207,751 + $484,753

$692,504

2024

$8,750 (+1.9%)

$203,678 + $475,249

$678,927

2023

$8,590 (+2.3%)

$199,685 + $465,933

$665,618

2022

$8,397 (+1.1%)

$191,932 + $447,841

$639,773

2021

$8,308 (+1.3%)

$191,932 + $447,841

$639,773

2020

$8,201 (−0.7%)

$188,169 + $439,061

$627,230

2019

$8,263 (+6.5%)

$186,240 + $434,561

$620,801

2018

$7,756 (+2.5%)

$182,590 + $426,043

$608,633

2017

$7,564 (+18.6%)

$175,500 + $409,500

$585,000

2016

$6,375 (+19.1%)

$175,500 + $409,500

$585,000

2015

$5,354 (+9.6%)

$149,700 + $349,300

$499,000

2014

$4,883 (+18.0%)

$117,000 + $273,000

$390,000

2013

$4,137 (+9.1%)

$117,000 + $273,000

$390,000

2012

$3,794 (+1.8%)

$97,500 + $227,500

$325,000

2011

$3,728 (−3.1%)

$88,500 + $206,500

$295,000

2010

$3,846 (−1.4%)

$87,000 + $203,000

$290,000

2009

$3,899 (−30.7%)

$91,800 + $214,200

$306,000

2008

$5,629

$92,100 + $214,900

$307,000

Tax history for 21735 Ada St

Year

Property tax

Land + Additions

Assessment*

2025

$8,971 (+2.5%)

$207,751 + $484,753

$692,504

2024

$8,750 (+1.9%)

$203,678 + $475,249

$678,927

2023

$8,590 (+2.3%)

$199,685 + $465,933

$665,618

2022

$8,397 (+1.1%)

$191,932 + $447,841

$639,773

2021

$8,308 (+1.3%)

$191,932 + $447,841

$639,773

2020

$8,201 (−0.7%)

$188,169 + $439,061

$627,230

2019

$8,263 (+6.5%)

$186,240 + $434,561

$620,801

2018

$7,756 (+2.5%)

$182,590 + $426,043

$608,633

2017

$7,564 (+18.6%)

$175,500 + $409,500

$585,000

2016

$6,375 (+19.1%)

$175,500 + $409,500

$585,000

2015

$5,354 (+9.6%)

$149,700 + $349,300

$499,000

2014

$4,883 (+18.0%)

$117,000 + $273,000

$390,000

2013

$4,137 (+9.1%)

$117,000 + $273,000

$390,000

2012

$3,794 (+1.8%)

$97,500 + $227,500

$325,000

2011

$3,728 (−3.1%)

$88,500 + $206,500

$295,000

2010

$3,846 (−1.4%)

$87,000 + $203,000

$290,000

2009

$3,899 (−30.7%)

$91,800 + $214,200

$306,000

2008

$5,629

$92,100 + $214,900

$307,000

*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

Beds

Baths

Stories

Lot width

—

Lot depth

—

Lot size

6,030

Year renovated

1955

Sq. Ft.

1,170

Year built

1947

Style

Single Family Residential

County

Alameda County

APN

415 009001200

Parking Spaces

Basement

Accessible

Yes

HOA Dues

—

Garage

Yes

Features

—

Last updated by owner on Jan 29, 2025.

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

Property details

Parking

Parking Information
Garage Spaces: 1
Covered Spaces: 1
Parking Features: Attached, Off Street, RV/Boat Parking

Interior

Bathroom Information
# of Bathrooms Total: 1
# of Bathrooms Full: 1
Other Bathrooms Included Features: Shower Over Tub, Updated Baths

Interior Features
Interior Features: Office
Appliances: Dishwasher
Laundry Features: Laundry Room
Street Level Features: 3 Bedrooms, 1 Bath, Laundry Facility, Main Entry
Flooring: Hardwood, Tile, Carpet

Room Information
Kitchen Features: Dishwasher,Eat-in Kitchen
Rooms Total: 6
Room Type: Office

Exterior

Building Information
Construction Materials: Wood Siding
Building Area Total: 1,170

Exterior Features
Exterior Features: Back Yard, Front Yard, Garden/Play, Side Yard, Sprinklers Automatic, Sprinklers Front, Sprinklers Side, Storage
Fencing: Fenced
Roof: Shingle

Property Information
Living Area: 1170
Living Area Units: Square Feet
Property Type: Residential
Property Sub Type: Single Family Residence
Year Built: 1947

Lot Information
Lot Size Square Feet: 6030
Lot Size Area: 0.13843
Lot Size Units: Acres
Lot Size Acres: 0.13843
Lot Features: Corner Lot, Level, Premium Lot, Sprinklers In Rear
Zoning: 1001

Utilities

Utility Information
Water Source: Public
Sewer: Public Sewer

Heating & Cooling
Has Heating
Heating: Floor Furnace
Cooling: Ceiling Fan(s)

Location

Homeowners Association Information
Pets Allowed: Yes

Public facts

Beds: 3
Baths: 1.0
Sq. Ft.: 1,170
Stories: 1.0
Parking Spaces: 1
Basement: No
Accessible: Yes
Lot Size: 6,030 square feet
Style: Single Family Residential
Year Built: 1947
Year Renovated: 1955
County: Alameda County
APN: 415 009001200
HOA Dues: —
Garage: Yes
Features: —

Home facts updated by owner on Jan 29, 2025

Around this home

Schools

Fairview Elementary School

Public K-6 • Assigned • 1.3mi

2/10

Bret Harte Middle School

Public 7-8 • Assigned • 1.3mi

4/10

Hayward High School

Public 9-12 • Assigned • 1.2mi

5/10

Provided by GreatSchools

Lifestyle

Provided by Walk Score and Local Logic

Local insights from Redfin agents

Castro Valley remains a highly competitive market. On average, homes are selling for 103.7% of their asking price, with nearly 60% of properties closing above list price.
2 weeks ago • Castro Valley
Karan Kandel
Redfin agent
13 deals
Was this helpful?
Hayward's fall market offers fantastic value for East Bay buyers. With median prices holding around $845K and homes averaging 20 days on market, you have breathing room to negotiate on older homes. Yet pristine, turnkey properties still move fast....
1 month ago • Hayward
Johnny Singh
Redfin Premier agent
150 deals
Was this helpful?

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

$814,000 – $986,000

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COMING SOON

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$859,000

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5,120 sq ft lot • 2 garage spots • Built 1959

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eXp Realty of California Inc.

$799,000

2 beds1 bath902 sq ft

4011 Berdina Rd, Castro Valley, CA 94546

Hardwood floors • Updated kitchen • Quartz countertops

OPEN FRI, 5PM TO 7PM3D WALKTHROUGH

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2 beds2 baths1,194 sq ft

20114 Normandy Ct, Castro Valley, CA 94546

Granite countertops • Attached sunroom • Private backyard

$899,999

3 beds2 baths1,461 sq ft

19371 Brusk Ct, Castro Valley, CA 94546

Fresh interior paint • Updated lighting • Repairs completed

Vista Sotheby's International Realty

Home values near 21735 Ada St

Data from public records.

Address	Redfin Estimate
21723 Ada Street, Castro Valley, CA 2 Beds \| 1.5 Baths \| 1170 Sq. Ft.	$912,415
21738 Ada Street, Castro Valley, CA 3 Beds \| 1 Baths \| 1104 Sq. Ft.	$784,521

Address	Redfin Estimate
21852 Ada Street, Castro Valley, CA 2 Beds \| 1 Baths \| 905 Sq. Ft.	$831,311
21886 Ada Street, Castro Valley, CA 2 Beds \| 1 Baths \| 1015 Sq. Ft.	$805,732

Address	Redfin Estimate
21724 Ada Street, Castro Valley, CA 3 Beds \| 1 Baths \| 1028 Sq. Ft.	$811,943
21895 Ada Street, Castro Valley, CA 3 Beds \| 2 Baths \| 1552 Sq. Ft.	$953,816

Property information provided by bridgeMLS, Bay East AOR, or Contra Costa AOR when last listed in 2016. This data may not show owner updates. 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 21735 Ada St

Tax history for 21735 Ada St

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 21735 Ada St

More real estate resources