21924 Ada St, Castro Valley, CA 94546 Property Records

Alameda County property record for 21924 Ada St, Castro Valley, CA 94546

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,530 sqft · built 1948
Lot Size	0.116 acres (5,040 sqft)
Owner	Individual Name on File
Last Sale	$960,000 (Apr 2025)
Tax Bill	$8,307 (2025)
Deeds & Mortgages	Feb 2020 Mortgage May 2022 Line of Credit + 3 more
Flood Zone	Zone X (moderate risk)
APN	`415-90-85`

Property Details

APN / Parcel Number

Primary APN	`415-90-85`
Alternative APN	`415-0090-085-00`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Total Rooms	6 Rooms
Stories	1 Story
Building Area	1,530 sqft Living Area

Exterior

Year Built	Built 1948
Effective Year Built	Effective 1948
Architectural Style	L-Shape
Construction Type	Wood
Lot Area	5,040 sqft (0.116 acres)
Parking Spaces	1 Parking Space

Location & Zoning

Street Address	21924 ADA ST
City	CASTRO VALLEY
State	CA
Zip	94546-6306
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT: 00014 BLK: 0001 TR: 0871
Legal Subdivision	871 EDEN TOWNSHIP
Legal Tract	0871
Legal Block	1
Legal Lot Number	14
Jurisdiction	ALAMEDA CA
Township / Civil Division	HAYWARD
Census Block Group	1
Census Block	1003
Census Tract	431200

Owner

21924 Ada St is owned and occupied by an individual who bought it in April 2025.

Source: Alameda County records, as of August 5, 2026

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Owner of Record	Individual Name on File
Mailing Address	21924 ADA ST, CASTRO VALLEY, CA 94546-6306
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Tenants in Common

Deeds, Mortgages & Sale History

Date	Document
Feb 24, 2020	Deed of Trust, Mortgage · Conventional Mortgage FREMONT BANK
May 23, 2022	Deed of Trust, Mortgage · Line of Credit FREMONT BANK
Aug 31, 2018	Quit Claim Deed, Transfer CHICAGO TITLE COMPANY
Aug 31, 2018	Grant Deed, Transfer · Conventional Mortgage FREMONT BANK
Feb 23, 2017	Affidavit of Death, Transfer ATTORNEY ONLY

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Apr 7, 2025 · Amount on File
Deed Sale	Apr 7, 2025 · Amount on File
Prior Sale	Aug 31, 2018 · Amount on File
Deed Document Number	202546822
Prior Transfer Date	Aug 29, 2018
Prior Transfer Doc	0000171574
Record Updated	Oct 29, 2026

February 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	21924 ADA ST, HAYWARD, CA 94546-6306
Transaction Type	Mortgage
Record Updated	Jul 19, 2022
Title Company	FIDELITY NATIONAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000043010
Date	Feb 24, 2020
Instrument	2020043010

Lender

Name	FREMONT BANK
Type	Bank
Address	LIVERMORE, CA 94551

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Mar 1, 2050

May 2022: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	21924 ADA ST, HAYWARD, CA 94546-6306
Transaction Type	Mortgage
Record Updated	Jul 19, 2022
Title Company	FIDELITY NATIONAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	207 MARSH CT, SAN RAMON, CA 94583-2023

Mortgage

Document Number	0000098771
Date	May 23, 2022
Instrument	2022098771

Lender

Name	FREMONT BANK
Type	Bank
Address	LIVERMORE, CA 94551

Agreement

Type	Line of Credit
Amount	Amount on Record
Term	360 Months
Due	May 20, 2052

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

August 2018: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	ALAMEDA CA
Recording Date	Aug 31, 2018
Property Address	21924 ADA ST, HAYWARD, CA 94546-6306
Document Number	0000171574
Instrument Date	Aug 29, 2018
Instrument	171574
Transaction Type	Transfer
Record Updated	Sep 21, 2018
Title Company	CHICAGO TITLE COMPANY

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Separate Estate/Property
Address	21924 ADA ST CASTRO VALLEY CA 945466306, CASTRO VALLEY, CA 94546-6306

August 2018: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	ALAMEDA CA
Recording Date	Aug 31, 2018
Property Address	21924 ADA ST, HAYWARD, CA 94546-6306
Document Number	0000171573
Map Reference	MB 27 PG 68
Instrument Date	Aug 28, 2018
Instrument	2018171573
Transaction Type	Transfer
Record Updated	Jul 19, 2022
Title Company	CHICAGO TITLE COMPANY

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$0.00
Amount Accuracy	Rounded by County

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants
Address	21924 ADA ST, CASTRO VALLEY, CA 94546-6306

Mortgage

Document Number	0000171575
Date	Aug 31, 2018
Instrument	2018171575

Lender

Name	FREMONT BANK
Type	Bank

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Sep 1, 2048

February 2017: Affidavit of Death, Transfer

Document Type	Affidavit of Death
Jurisdiction	ALAMEDA CA
Recording Date	Feb 23, 2017
Property Address	21924 ADA ST, HAYWARD, CA 94546-6306
Document Number	0000047813
Instrument Date	Feb 1, 2017
Instrument	47813
Transaction Type	Transfer
Record Updated	Mar 9, 2017
Title Company	ATTORNEY ONLY

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	4509 FALKIRK BAY OXNARD CA 930353709, OXNARD, CA 93035-3709

Tax Assessment & Valuation

The 2025 property tax bill for 21924 Ada St was $8,307, up 2.5% from the year before.

Source: Alameda County assessment roll, as of August 5, 2026

Property Jurisdictions

Type	Name
State	California
County	Alameda County
Unified School District	Hayward Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$979,200 (+58.93%) Land $293,760 Building $685,440
2025	$8,307.00 (+2.52%)	$616,138 Land $187,228 Building $428,910
2024	$8,103.00 (+1.86%)
2023	$7,955.00	$592,216 Land $179,959 Building $412,257	$728,010

Assessed value and assessed market value are set for property tax purposes and are not market price estimates.

Flood

FEMA maps place 21924 Ada St in Zone X, an area of moderate flood risk, within 500 ft of a high-risk flood zone.

Source: FEMA National Flood Hazard Layer, effective May 25, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood Zone	Zone X moderate risk
500-Year Floodplain	Yes 0.2% annual chance
Nearest Special Flood Hazard Area	Zone AE, within 500 ft
Flood Insurance Requirement	Not required lenders may require it
Flood Insurance Cost	Premium on File median of 15 policies
Community Rating System	Class 7 (15% premium discount)
Nearby Flood Policies	15 in force
Nearby Flood Claims	1 (1996)
Most Recent Claim	Dec 1996 · rainfall accumulation

Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.

Wildfire

The area around 21924 Ada St has no burnable land within ember reach, so its wildfire risk is not rated.

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire Risk	Not rated no burnable land within ember reach

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water System	EAST BAY MUD serves 1,468,000 people · EPA ID CA0110005
Water Source	Surface water
Last State Inspection	Dec 2021
Lead	Under 1 ppb (2022–2024) action level 15 ppb

Violations Reported to EPA

Water Quality	None last 10 years
Treatment and Procedure	None last 10 years
Monitoring and Reporting	None last 3 years

Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes. This system sells water to local utilities; the supplier billing this address may be one of them.

Internet Providers

Source: FCC Broadband Data Collection, based on 744 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Sonic Telecom Fiber	10,000 / 10,000
AT&T Fiber · Fixed Wireless, DSL in parts of the area	5,000 / 5,000
Xfinity Cable	2,000 / 250
Unwired Fixed Wireless	300 / 25
Verizon Fixed Wireless	300 / 20
Etheric Networks Fixed Wireless	250 / 100
T-Mobile Fixed Wireless	100 / 20

May also be available: GeoLinks.

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