4238 Gem Ave, Castro Valley, CA 94546 Property Records

Alameda County property record for 4238 Gem Ave, Castro Valley, CA 94546

Property Summary

Property Type	Single Family Home
Details	2 bd · 1 ba · 1,144 sqft · built 1947
Lot Size	0.14 acres (6,090 sqft)
Owner	2 Individual Names on Record
Last Sale	$700,000 (May 2018)
Tax Bill	$10,185 (2025)
Deeds & Mortgages	Jun 2021 Mortgage May 2018 Sale & Mortgage
Flood Zone	Zone X (minimal risk)
APN	`84C-669-32`

Property Details

APN / Parcel Number

Primary APN	`84C-669-32`
Alternative APN	`084C-0669-032-00`

Interior

Bedrooms	2 Beds
Full Baths	1 Bath
Total Rooms	5 Rooms
Stories	1 Story
Building Area	1,144 sqft Living Area

Exterior

Year Built	Built 1947
Effective Year Built	Effective 1947
Architectural Style	L-Shape
Construction Type	Wood
Lot Area	6,090 sqft (0.14 acres)

Location & Zoning

Street Address	4238 GEM AVE
City	CASTRO VALLEY
State	CA
Zip	94546-4617
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT: 00007 BLK: 0001 TR: 0807
Legal Tract	0807
Jurisdiction	ALAMEDA CA
Township / Civil Division	HAYWARD
Census Block Group	4
Census Block	4000
Census Tract	430800

Owner

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

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record	2 Individual Names on Record
Mailing Address	4238 GEM AVE, CASTRO VALLEY, CA 94546-4617
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Community Property

Deeds, Mortgages & Sale History

Date	Document
Jun 15, 2021	Deed of Trust, Mortgage · Conventional Mortgage QUICKEN LOANS LLC
May 25, 2018	Grant Deed, Transfer · Conventional Mortgage QUICKEN LNS

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	May 25, 2018 · Amount on Record
Deed Sale	May 25, 2018 · Amount on Record
Deed Document Number	2018104681
Record Updated	Oct 29, 2026

June 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	4238 GEM AVE, CASTRO VALLEY, CA 94546-4617
Transaction Type	Mortgage
Record Updated	Jul 5, 2021
Title Company	OLD REPUBLIC TITLE COMPANY CASTRO V, OLD REPUBLIC TTL CO CASTRO V

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	4238 GEM AVE, CASTRO VALLEY, CA 94546-4617

Mortgage

Document Number	0000216844
Date	Jun 15, 2021
Instrument	2021216844

Lender

Name	QUICKEN LOANS LLC
Type	Mortgage Company
Address	DETROIT, MI 48226

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Jul 1, 2051

May 2018: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	ALAMEDA CA
Recording Date	May 25, 2018
Property Address	4238 GEM AVE, CASTRO VALLEY, CA 94546-4617
Document Number	0000104681
Instrument Date	May 20, 2018
Instrument	104681
Transaction Type	Transfer
Record Updated	Jun 14, 2018
Title Company	FIDELITY NATIONAL TITLE

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$770.00
Amount Accuracy	Full Value
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Community Property
Address	4238 GEM AVE CASTRO VALLEY CA 945464617, CASTRO VALLEY, CA 94546-4617

Mortgage

Document Number	104682
Date	May 25, 2018
Instrument	104682

Lender

Name	QUICKEN LNS
Type	Funding / Finance Company
Address	DETROIT, MI 48226-1906

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	360 Months
Due	May 24, 2048

Tax Assessment & Valuation

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		$805,391 (+1.12%) Land $243,717 Building $568,674
2025	$10,185.00 (+3.94%) Homeowner's exemption	$796,466 (+4.04%) Land $238,940 Building $557,526
2023	$9,799.00 Homeowner's exemption	$765,540 Land $229,662 Building $535,878	$823,590

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

Flood

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

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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