4288 Gem Ave, Castro Valley, CA 94546 Property Records

Alameda County property record for 4288 Gem Ave, Castro Valley, CA 94546

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,399 sqft · built 1947
Lot Size	0.137 acres (5,985 sqft)
Owner	Company Name on Record
Last Sale	$159,500 (Sep 1997)
Tax Bill	$4,856 (2025)
Deeds & Mortgages	May 2021 Line of Credit May 2021 Mortgage + 2 more
Flood Zone	Zone X (minimal risk)
APN	`84C-669-23`

Property Details

APN / Parcel Number

Primary APN	`84C-669-23`
Alternative APN	`084C-0669-023-00`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Total Rooms	5 Rooms
Stories	1 Story
Building Area	1,399 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1947
Effective Year Built	Effective 1970
Architectural Style	L-Shape
Exterior Material	Wood
Construction Type	Wood
Roof Material	Composition Shingle
Lot Area	5,985 sqft (0.137 acres)
Lot Dimensions	105 ft deep x 56 ft wide

Utilities, Heating & Cooling

Heating System	Floor/Wall Furnace
Heating Fuel	Gas
Sewer	Municipal
Water Source	Commercial

Location & Zoning

Street Address	4288 GEM AVE
City	CASTRO VALLEY
State	CA
Zip	94546-4617
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1
Legal Description	LOT: 00016 BLK: 0001 TR: 0807
Legal Subdivision	TRACT NO 807
Legal Tract	0807
Legal Lot Number	16
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	4288 GEM AVE, CASTRO VALLEY, CA 94546-4617
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust

Deeds, Mortgages & Sale History

Date	Document
May 27, 2021	Deed of Trust, Mortgage · Line of Credit PATELCO CU
May 3, 2021	Deed of Trust, Mortgage · Conventional Mortgage PATELCO CU
May 19, 2020	Quit Claim Deed, Transfer ATTORNEY ONLY
Apr 7, 2017	Deed of Trust, Mortgage · Line of Credit FREMONT BK

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Sep 30, 1997 · Amount on Record
Deed Sale	Sep 30, 1997 · Amount on Record
Deed Document Number	1997255220
Last Transfer Date	May 11, 2020
Transfer Doc	0000116138
Record Updated	Sep 20, 2026

May 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	4288 GEM AVE, CASTRO VALLEY, CA 94546-4617
Transaction Type	Mortgage
Record Updated	Jun 16, 2021
Title Company	NATIONAL CLOSING SOLUTIONS

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	4288 GEM AVE, CASTRO VALLEY, CA 94546-4617

Mortgage

Document Number	0000198800
Date	May 27, 2021
Instrument	2021198800

Lender

Name	PATELCO CU
Type	Credit Union
Address	DUBLIN, CA 94568

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	302 Months
Due	Jun 30, 2046

Interest

Rate Type	Adjustable Rate
Rate	3.5%
Change Frequency	Monthly

May 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	4288 GEM AVE, CASTRO VALLEY, CA 94546-4617
Transaction Type	Mortgage
Record Updated	May 19, 2021
Title Company	E-PLACER TITLE, PLACER TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	4288 GEM AVE, CASTRO VALLEY, CA 94546-4617

Mortgage

Document Number	0000170053
Date	May 3, 2021
Instrument	2021170053

Lender

Name	PATELCO CU
Type	Credit Union
Address	DUBLIN, CA 94568

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	180 Months
Due	May 1, 2036

May 2020: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	ALAMEDA CA
Recording Date	May 19, 2020
Property Address	4288 GEM AVE, CASTRO VALLEY, CA 94546-4617
Document Number	0000116138
Instrument Date	May 11, 2020
Instrument	116138
Transaction Type	Transfer
Record Updated	Jul 3, 2020
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	Revocable Trust
Address	4288 GEM AVE CASTRO VALLEY CA 945464617, CASTRO VALLEY, CA 94546-4617

April 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	4288 GEM AVE, CASTRO VALLEY, CA 94546-4617
Document Number	0000082961
Instrument Date	Apr 7, 2017
Transaction Type	Mortgage
Record Updated	Apr 26, 2017
Title Company	FIRST AMERICAN TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants with Right of Survivorship
Address	4288 GEM AVE CASTRO VALLEY CA 945464617, CASTRO VALLEY, CA 94546-4617

Mortgage

Document Number	0000082961
Date	Apr 12, 2017
Instrument	82961

Lender

Name	FREMONT BK
Type	Bank
Address	LIVERMORE, CA 94551

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	300 Months
Due	Apr 11, 2042

Interest

Rate Type	Adjustable Rate

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		$344,797 (-0.03%) Land $78,009 Building $273,788
2025	$4,856.00 (+4.5%) Homeowner's exemption	$344,901 (+4.04%) Land $76,480 Building $268,421
2023	$4,647.00 Homeowner's exemption	$331,510 Land $73,511 Building $257,999	$844,560

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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