18934 Masterson Pl, Castro Valley, CA 94552 Property Records

Alameda County property record for 18934 Masterson Pl, Castro Valley, CA 94552

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,354 sqft · built 1985
Lot Size	0.152 acres (6,632 sqft)
Owner	2 Individual Names on File
Last Sale	$290,000 (Nov 1998)
Tax Bill	$6,230 (2025)
Deeds & Mortgages	Feb 2022 Mortgage
Flood Zone	Zone X (minimal risk)
APN	`85A-6403-85`

Property Details

APN / Parcel Number

Primary APN	`85A-6403-85`
Alternative APN	`085A-6403-085-00`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Total Rooms	5 Rooms
Stories	1 Story
Building Area	1,354 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1985
Effective Year Built	Effective 1985
Architectural Style	L-Shape
Exterior Material	Wood
Construction Type	Wood
Roof Material	Tile
Lot Area	6,632 sqft (0.152 acres)
Parking Spaces	2 Parking Spaces

Utilities, Heating & Cooling

Heating System	Forced Air with A/C
Heating Fuel	Gas
Sewer	Municipal
Water Source	Commercial

Location & Zoning

Street Address	18934 MASTERSON PL
City	CASTRO VALLEY
State	CA
Zip	94552-5082
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	PD
Legal Description	LOT: 00082 BLK: TR: 4468
Legal Subdivision	TRACT 4468 IN THE
Legal Tract	4468
Legal Lot Number	82
Jurisdiction	ALAMEDA CA
Township / Civil Division	HAYWARD
Census Block Group	3
Census Block	3003
Census Tract	430101

Owner

18934 Masterson Pl is owned and occupied by two individuals who acquired it in July 2009.

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

Owner of Record	2 Individual Names on File
Mailing Address	18934 MASTERSON PL, CASTRO VALLEY, CA 94552-5082
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Community Property

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

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Nov 6, 1998 · Amount on File
Deed Sale	Nov 6, 1998 · Amount on File
Prior Sale	Apr 30, 1997 · Amount on File
Deed Document Number	1998391967
Last Transfer Date	Jul 13, 2009
Transfer Doc	0000229551
Record Updated	Oct 29, 2026

February 2022: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	18934 MASTERSON PL, CASTRO VALLEY, CA 94552-5082
Transaction Type	Mortgage
Record Updated	Feb 17, 2022
Title Company	WFT NATIONAL TITLE, WFG NATIONAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	18934 MASTERSON PL, CASTRO VALLEY, CA 94552-5082

Mortgage

Document Number	0000021186
Date	Feb 1, 2022
Instrument	2022021186

Lender

Name	OPTIMUM FIRST INC
Type	Mortgage Company
Address	FOUNTAIN VALLEY, CA 92708

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	180 Months
Due	Feb 1, 2037

Tax Assessment & Valuation

The 2025 property tax bill for 18934 Masterson Pl was $6,230.

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		$463,381 (+2%) Land $139,110 Building $324,271
2025	$6,230.00	$454,295 Land $136,382 Building $317,913
2023	$5,978.00	$436,658 Land $131,088 Building $305,570	$1,044,360

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

Flood

FEMA maps place 18934 Masterson Pl in Zone X, an area of minimal flood risk, though there have been 2 flood claims nearby since 2017.

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	2 in force
Nearby Flood Claims	2 (2017–2022)
Claims Outside the SFHA	2 of 2
Most Recent Claim	Dec 2022 · Severe Winter Storms, Flooding, Landslides, And Mudslides

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

Wildfire risk around 18934 Masterson Pl is high, ranking above 76% of the US, with a 0.5% annual chance of wildfire.

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire Risk	High above 76% of the US · above 52% of California
Wildfire Likelihood	0.5% annual chance
Exposure	Indirect within ember reach
Adjoins Burnable Land	Yes

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 411 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Xfinity Cable	2,000 / 250
Unwired Fixed Wireless	300 / 25
Verizon Fixed Wireless	300 / 20
T-Mobile Fixed Wireless	100 / 20
AT&T DSL	100 / 20

May also be available: Etheric Networks.

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