18778 Masterson Pl, Castro Valley, CA 94552 Property Records

Alameda County property record for 18778 Masterson Pl, Castro Valley, CA 94552

Property Summary

Property Type	Single Family Home
Details	4 bd · 2.5 ba · 2,634 sqft · built 1985
Lot Size	0.171 acres (7,427 sqft)
Owner	Trust Name on File
Last Sale	$1,200,000 (Sep 2018)
Tax Bill	$16,664 (2025)
Deeds & Mortgages	Aug 2022 Transfer Sep 2018 Sale & Mortgage
Flood Zone	Zone X (minimal risk)
APN	`85A-6403-79`

Property Details

APN / Parcel Number

Primary APN	`85A-6403-79`
Alternative APN	`085A-6403-079-00`

Interior

Bedrooms	4 Beds
Full Baths	2.5 Baths
Half Baths	1 Half Bath
Total Rooms	8 Rooms
Stories	2 Stories
Building Area	2,634 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1985
Effective Year Built	Effective 1990
Architectural Style	L-Shape
Exterior Material	Stucco
Construction Type	Wood
Roof Material	Tile
Lot Area	7,427 sqft (0.171 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	18778 MASTERSON PL
City	CASTRO VALLEY
State	CA
Zip	94552-5082
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1
Legal Description	LOT: 00076 BLK: TR: 4468
Legal Subdivision	TRACT 4468 FILED FEBRUARY 19 1980
Legal Tract	4468
Legal Block	3
Legal Lot Number	76
Jurisdiction	ALAMEDA CA
Township / Civil Division	HAYWARD
Census Block Group	3
Census Block	3003
Census Tract	430101

Owner

18778 Masterson Pl is held in a trust since June 2022.

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

Owner of Record	Trust Name on File
Mailing Address	10018 FOXBORO CIR, SAN RAMON, CA 94583-2627
Owner Type	Company
Vesting	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
Aug 30, 2022	Intrafamily Transfer, Transfer
Sep 25, 2018	Grant Deed, Transfer · ARM FREMONT BANK

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Sep 25, 2018 · Amount on File
Deed Sale	Sep 25, 2018 · Amount on File
Deed Document Number	2018185824
Last Transfer Date	Jun 20, 2022
Transfer Doc	0000150454
Record Updated	Sep 20, 2026

August 2022: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	ALAMEDA CA
Recording Date	Aug 30, 2022
Property Address	18778 MASTERSON PL, CASTRO VALLEY, CA 94552-5082
Document Number	0000150454
Map Reference	MB 117 PG 1-14
Instrument Date	Jun 20, 2022
Instrument	2022150454
Transaction Type	Transfer
Record Updated	Jun 7, 2023

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	10018 FOXBORO CIR, SAN RAMON, CA 94583-2627

September 2018: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	ALAMEDA CA
Recording Date	Sep 25, 2018
Property Address	18778 MASTERSON PL, CASTRO VALLEY, CA 94552-5082
Document Number	0000185824
Map Reference	MB 117 PG 1-14
Instrument Date	Sep 14, 2018
Instrument	2018185824
Transaction Type	Transfer
Record Updated	Aug 19, 2021
Title Company	FIDELITY NATIONAL TITLE COMP

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$0.00
Amount Accuracy	Rounded by County
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants
Address	18778 MASTERSON PL, CASTRO VALLEY, CA 94552-5082

Mortgage

Document Number	0000185825
Date	Sep 25, 2018
Instrument	2018185825

Lender

Name	FREMONT BANK
Type	Bank

Agreement

Type	ARM
Amount	Amount on Record
Term	361 Months
Due	Oct 1, 2048

Interest

Rate Type	Adjustable Rate
Rate	4.12%
Type Change Date	Oct 1, 2023
Change Frequency	Annually
Min Rate At Change	2.87%
Max Rate At Change	6.12%
Index	1-Year LIBOR
Max Rate	9.12%

Tax Assessment & Valuation

The 2025 property tax bill for 18778 Masterson Pl was $16,664.

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		$1,365,371 (+2%) Land $409,611 Building $955,760
2025	$16,664.00	$1,338,600 Land $401,580 Building $937,020
2023	$15,985.00 Homeowner's exemption	$1,286,627 Land $385,988 Building $900,639	$1,385,010

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

Flood

FEMA maps place 18778 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 18778 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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