21047 Sherman Dr, Castro Valley, CA 94552 Property Records

Alameda County property record for 21047 Sherman Dr, Castro Valley, CA 94552

Property Summary

Property Type	Single Family Home
Details	4 bd · 2.5 ba · 1,940 sqft · built 1998
Lot Size	0.1 acres (4,361 sqft)
Owner	2 Individual Names on File
Last Sale	$360,000 (Jan 1999)
Tax Bill	$7,436 (2025)
Deeds & Mortgages	Mar 2017 Transfer
Flood Zone	Zone X (minimal risk)
APN	`85A-6414-109-1`

Property Details

APN / Parcel Number

Primary APN	`85A-6414-109-1`
Alternative APN	`085A-6414-109-01`

Interior

Bedrooms	4 Beds
Full Baths	2.5 Baths
Half Baths	1 Half Bath
Total Rooms	8 Rooms
Stories	2 Stories
Building Area	1,940 sqft Living Area

Exterior

Year Built	Built 1998
Effective Year Built	Effective 1998
Architectural Style	L-Shape
Construction Type	Wood
Lot Area	4,361 sqft (0.1 acres)
Parking Spaces	2 Parking Spaces

Location & Zoning

Street Address	21047 SHERMAN DR
City	CASTRO VALLEY
State	CA
Zip	94552-5347
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT: 00056 BLK: TR: 5973
Legal Tract	5973
Jurisdiction	ALAMEDA CA
Township / Civil Division	HAYWARD
Census Block Group	4
Census Block	4008
Census Tract	430101

Owner

Source: Alameda County records · APN 85A-6414-109-1

Assessment roll updated August 5, 2026 · Last verified August 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 File
Mailing Address	21047 SHERMAN DR, CASTRO VALLEY, CA 94552-5347
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Community Property

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Verified Names on Deed
Last Sale	Jan 19, 1999 · Amount on Record
Deed Sale	Jan 19, 1999 · Amount on Record
Deed Document Number	199921290
Last Transfer Date	Feb 18, 2017
Transfer Doc	0000054909
Record Updated	Sep 20, 2026

March 2017: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	ALAMEDA CA
Recording Date	Mar 03, 2017
Property Address	21047 SHERMAN DR, CASTRO VALLEY, CA 94552-5347
Document Number	0000054909
Instrument Date	Feb 18, 2017
Instrument	54909
Transaction Type	Transfer
Record Updated	Mar 17, 2017

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Community Property
Address	21047 SHERMAN DR CASTRO VALLEY CA 945525347, CASTRO VALLEY, CA 94552-5347

Tax Assessment & Valuation

Source: Alameda County records · Assessment roll updated August 5, 2026 · Last verified August 2026

Property Jurisdictions

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

Tax Bill & Assessment History

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

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$567,822 (+0.76%) Land $171,887 Building $402,935
2025	$7,436.00 (+4.12%) Homeowner's exemption	$563,552 (+4.04%) Land $168,517 Building $395,035
2023	$7,142.00 Homeowner's exemption	$541,674 Land $161,975 Building $379,699	$1,224,360

Flood & Wildfire

Source: FEMA National Flood Hazard Layer as of May 25, 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 2026

Flood

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

Wildfire

Wildfire Risk	High above 77% of the US · above 53% of California
Wildfire Likelihood	0.5% annual chance
Exposure	Indirect within ember reach
Adjoins Burnable Land	Yes

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

Internet Providers

Source: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026

Provider	Max Down / Up (Mbps)
Xfinity Cable	2,000 / 250
Verizon Fixed Wireless	300 / 20
Etheric Communications, LLC. Fixed Wireless	250 / 100
AT&T DSL	100 / 20

May also be available: Unwired.

Based on FCC filings for 496 locations within half a mile of this property.

Drinking Water

Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026

Water System	EAST BAY MUD serves 1,468,000 people
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 as reported to EPA, 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. The full violation and enforcement history is in the system's EPA record.