4260 Gem Ave, Castro Valley, CA 94546 Property Records

Alameda County property record for 4260 Gem Ave, Castro Valley, CA 94546

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,480 sqft · built 1947
Lot Size	0.137 acres (5,985 sqft)
Owner	Company Name on Record
Last Sale	$325,000 (Jun 2002)
Tax Bill	$7,576 (2025)
Deeds & Mortgages	Jan 2021 Mortgage Mar 2017 Transfer
Flood Zone	Zone X (minimal risk)
APN	`84C-669-28`

Property Details

APN / Parcel Number

Primary APN	`84C-669-28`
Alternative APN	`084C-0669-028-00`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Total Rooms	6 Rooms
Stories	1 Story
Building Area	1,480 sqft Living Area

Exterior

Year Built	Built 1947
Effective Year Built	Effective 1970
Architectural Style	L-Shape
Construction Type	Wood
Lot Area	5,985 sqft (0.137 acres)
Parking Spaces	1 Parking Space

Location & Zoning

Street Address	4260 GEM AVE
City	CASTRO VALLEY
State	CA
Zip	94546-4617
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT: 00011 BLK: 0001 TR: 0807
Legal Subdivision	TRACT 807
Legal Tract	0807
Legal Block	1
Legal Lot Number	11
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	Company Name on Record
Mailing Address	4260 GEM AVE, CASTRO VALLEY, CA 94546-4617
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust

Deeds, Mortgages & Sale History

Date	Document
Jan 25, 2021	Deed of Trust, Mortgage · Conventional Mortgage ZILLOW HOME LOANS LLC
Mar 15, 2017	Quit Claim Deed, Transfer Quitclaim

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Jun 3, 2002 · Amount on Record
Deed Sale	Jun 3, 2002 · Amount on Record
Prior Sale	Mar 7, 1997 · Amount on Record
Deed Document Number	2002243940
Last Transfer Date	Feb 27, 2017
Transfer Doc	0000062811
Record Updated	Oct 29, 2026

January 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	4260 GEM AVE, CASTRO VALLEY, CA 94546-4617
Transaction Type	Mortgage
Record Updated	Apr 5, 2021
Title Company	BOSTON NATIONAL TITLE CO

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	4260 GEM AVE, CASTRO VALLEY, CA 94546-4617

Mortgage

Document Number	0000029359
Date	Jan 25, 2021
Instrument	2021029359

Lender

Name	ZILLOW HOME LOANS LLC
Type	Mortgage Company
Address	LEAWOOD, KS 66211

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	181 Months
Due	Feb 1, 2036

March 2017: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	ALAMEDA CA
Recording Date	Mar 15, 2017
Property Address	4260 GEM AVE, CASTRO VALLEY, CA 94546-4617
Document Number	0000062811
Instrument Date	Feb 27, 2017
Instrument	62811
Transaction Type	Transfer
Record Updated	Mar 28, 2017

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Personal Trust
Address	4260 GEM AVE CASTRO VALLEY CA 945464617, CASTRO VALLEY, CA 94546-4617

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		$579,883 (+0.78%) Land $146,907 Building $439,976
2025	$7,576.00 (+4.11%) Homeowner's exemption	$575,377 (+4.04%) Land $144,027 Building $431,350
2023	$7,277.00 Homeowner's exemption	$553,039 Land $138,435 Building $414,604	$887,760

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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