4226 Gem Ave, Castro Valley, CA 94546 Property Records

Alameda County property record for 4226 Gem Ave, Castro Valley, CA 94546

Property Summary

Property Type	Single Family Home
Details	5 bd · 3 ba · 1,968 sqft · built 1947
Lot Size	0.133 acres (5,775 sqft)
Owner	Trust Name on File
Tax Bill	$3,835 (2025)
Deeds & Mortgages	Nov 2019 Line of Credit Sep 2018 Transfer
Flood Zone	Zone X (minimal risk)
APN	`84C-669-34`

Property Details

APN / Parcel Number

Primary APN	`84C-669-34`
Alternative APN	`084C-0669-034-00`

Interior

Bedrooms	5 Beds
Full Baths	3 Baths
Total Rooms	10 Rooms
Units	2 Units
Stories	1 Story
Building Area	1,968 sqft Living Area

Exterior

Year Built	Built 1947
Effective Year Built	Effective 1975
Architectural Style	L-Shape
Construction Type	Wood
Lot Area	5,775 sqft (0.133 acres)
Parking Spaces	1 Parking Space

Location & Zoning

Street Address	4226 GEM AVE
City	CASTRO VALLEY
State	CA
Zip	94546-4617
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT: 00005 BLK: 0001 TR: 0807
Legal Subdivision	TRACT 807
Legal Tract	0807
Legal Block	1
Legal Lot Number	5
Jurisdiction	ALAMEDA CA
Township / Civil Division	HAYWARD
Census Block Group	4
Census Block	4000
Census Tract	430800

Owner

4226 Gem Ave is owner-occupied and held in a trust since August 2016.

Source: Alameda County records, as of September 28, 2026

Owner of Record	Trust Name on File
Mailing Address	4226 GEM AVE, CASTRO VALLEY, CA 94546-4617
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust

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

Deeds, Mortgages & Sale History

Date	Document
Nov 8, 2019	Deed of Trust, Mortgage · Line of Credit WELLS FARGO BANK NA
Sep 28, 2018	Quit Claim Deed, Transfer ATTORNEY ONLY

Assessor's Deed Record

Deed Names	Name on Deed
Last Transfer Date	Aug 29, 2016
Transfer Doc	0000218574
Record Updated	Oct 29, 2026

November 2019: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	4226 GEM AVE, CASTRO VALLEY, CA 94546-4617
Transaction Type	Mortgage
Record Updated	Aug 19, 2021

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000230010
Date	Nov 8, 2019
Instrument	2019230010

Lender

Name	WELLS FARGO BANK NA
Type	Bank
Address	SIOUX FALLS, SD 57104

Agreement

Type	Line of Credit
Amount	Amount on Record
Term	360 Months
Due	Nov 15, 2049

September 2018: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	ALAMEDA CA
Recording Date	Sep 28, 2018
Property Address	4226 GEM AVE, CASTRO VALLEY, CA 94546-4617
Document Number	0000189308
Instrument Date	Sep 14, 2018
Instrument	189308
Transaction Type	Transfer
Record Updated	Oct 22, 2018
Title Company	ATTORNEY ONLY

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Living Trust
Address	4226 GEM AVE CASTRO VALLEY CA 945464617, CASTRO VALLEY, CA 94546-4617

Tax Assessment & Valuation

The 2025 property tax bill for 4226 Gem Ave was $3,835 with a homeowner's exemption.

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

Property Jurisdictions

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

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$192,606 (-1.58%) Land $36,734 Building $162,872
2025	$3,835.00 Homeowner's exemption	$195,693 Land $36,014 Building $159,679
2023	$3,610.00 Homeowner's exemption	$188,095 Land $34,615 Building $153,480	$1,173,600

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

Flood

FEMA maps place 4226 Gem Ave in Zone X, an area of minimal flood risk.

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 minimal risk
Flood Insurance Requirement	Not required lenders may require it
Community Rating System	Class 7 (15% premium discount)
Nearby Flood Policies	1 in force

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

Wildfire risk around 4226 Gem Ave is low, with a 0.01% annual chance of wildfire.

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

Wildfire Risk	Low lower than 80% of the US · lower than 88% of California
Wildfire Likelihood	0.01% annual chance
Exposure	None beyond 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 777 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 · DSL · Fixed Wireless in parts of the area	5,000 / 5,000
Xfinity Cable	2,000 / 250
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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