4207 Gem Ave, Castro Valley, CA 94546 Property Records

Alameda County property record for 4207 Gem Ave, Castro Valley, CA 94546

Property Summary

Property Type	Single Family Home
Details	3 bd · 1 ba · 1,216 sqft · built 1947
Lot Size	0.136 acres (5,940 sqft)
Owner	2 Trust Names on File
Last Sale	$144,000 (Oct 2025)
Tax Bill	$4,387 (2025)
Deeds & Mortgages	Dec 2025 Transfer Oct 2025 Sale & Mortgage + 2 more
Flood Zone	Zone X (minimal risk)
APN	`84C-669-39`

Property Details

APN / Parcel Number

Primary APN	`84C-669-39`
Alternative APN	`084C-0669-039-00`

Interior

Bedrooms	3 Beds
Full Baths	1 Bath
Total Rooms	6 Rooms
Stories	1 Story
Building Area	1,216 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1947
Effective Year Built	Effective 1947
Architectural Style	L-Shape
Exterior Material	Wood Siding
Construction Type	Wood
Roof Material	Composition Shingle
Lot Area	5,940 sqft (0.136 acres)

Utilities, Heating & Cooling

Heating System	Floor/Wall Furnace
Sewer	Municipal
Water Source	Commercial

Location & Zoning

Street Address	4207 GEM AVE
City	CASTRO VALLEY
State	CA
Zip	94546-4616
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT: 00001 BLK: 0002 TR: 0807
Legal Subdivision	TRACT 807
Legal Tract	0807
Legal Block	2
Legal Lot Number	1
Jurisdiction	ALAMEDA CA
Township / Civil Division	HAYWARD
Census Block Group	3
Census Block	3011
Census Tract	430800

Owner

4207 Gem Ave is owner-occupied and held in a trust since October 2025.

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

Owner of Record	2 Trust Names on File
Mailing Address	4207 GEM AVE, CASTRO VALLEY, CA 94546-4616
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust, Family 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
Dec 31, 2025	Intrafamily Transfer, Transfer
Oct 13, 2025	Grant Deed, Transfer · Conventional Mortgage COMERICA BANK
Mar 11, 2024	Intrafamily Transfer, Transfer
Mar 11, 2024	Intrafamily Transfer, Transfer

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Oct 13, 2025 · Amount on File
Deed Sale	Oct 13, 2025 · Amount on File
Deed Document Number	2025128189
Prior Transfer Date	Feb 27, 2024
Prior Transfer Doc	0000034773
Record Updated	Sep 20, 2026

December 2025: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	ALAMEDA CA
Recording Date	Dec 31, 2025
Property Address	4207 GEM AVE, CASTRO VALLEY, CA 94546-4616
Document Number	0000167092
Instrument Date	Dec 31, 2025
Instrument	2025167092
Transaction Type	Transfer
Record Updated	Feb 5, 2026

Transaction

Tax	$0.00
Amount Accuracy	No Consideration Stated
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	4207 GEM AVE, CASTRO VALLEY, CA 94546-4616

October 2025: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	ALAMEDA CA
Recording Date	Oct 13, 2025
Property Address	4207 GEM AVE, CASTRO VALLEY, CA 94546-4616
Document Number	0000128189
Map Reference	MB 19 PG 94 & 95
Instrument Date	Oct 1, 2025
Instrument	2025128189
Transaction Type	Transfer
Record Updated	Apr 2, 2026
Title Company	FIDELITY NATIONAL TITLE, FIDELITY NATIONAL TITLE CO

Transaction

Amount	Amount on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$158.40
Amount Accuracy	Rounded by County

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Tenants in Common
Address	4207 GEM AVE, CASTRO VALLEY, CA 94546-4616

Mortgage

Document Number	0000128190
Date	Oct 13, 2025
Instrument	2025128190

Lender

Name	COMERICA BANK
Type	Bank

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Nov 1, 2055

March 2024: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	ALAMEDA CA
Recording Date	Mar 11, 2024
Property Address	4207 GEM AVE, CASTRO VALLEY, CA 94546-4616
Document Number	0000034772
Map Reference	MB 19 PG 94&95
Instrument Date	Feb 27, 2024
Instrument	2024034772
Transaction Type	Transfer
Record Updated	Apr 18, 2024

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Community Property with Right of Survivorship
Address	4207 GEM AVE, CASTRO VALLEY, CA 94546-4616

March 2024: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	ALAMEDA CA
Recording Date	Mar 11, 2024
Property Address	4207 GEM AVE, CASTRO VALLEY, CA 94546-4616
Document Number	0000034773
Map Reference	MB 19 PG 94&95
Instrument Date	Feb 27, 2024
Instrument	2024034773
Transaction Type	Transfer
Record Updated	Apr 18, 2024

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Family Trust
Address	4207 GEM AVE, CASTRO VALLEY, CA 94546-4616

Tax Assessment & Valuation

The 2025 property tax bill for 4207 Gem Ave was $4,387.

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		$304,211 (-0.29%) Land $93,363 Building $217,848
2025	$4,387.00 Homeowner's exemption	$305,110 Land $91,533 Building $213,577
2023	$4,193.00 Homeowner's exemption	$293,263 Land $87,979 Building $205,284	$823,050

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

Flood

FEMA maps place 4207 Gem Ave in Zone X, an area of minimal flood risk.

Source: FEMA National Flood Hazard Layer, effective May 25, 2026

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it

Values are read at the parcel center point; lenders make the official flood determination.

Wildfire

Wildfire risk around 4207 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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