18805 Masterson Pl, Castro Valley, CA 94552 Property Records

Alameda County property record for 18805 Masterson Pl, Castro Valley, CA 94552

Property Summary

Property Type	Single Family Home
Details	5 bd · 2.5 ba · 2,519 sqft · built 1985
Lot Size	0.135 acres (5,880 sqft)
Owner	2 Individual Names on File
Last Sale	$722,000 (Oct 2013)
Tax Bill	$11,312 (2025)
Deeds & Mortgages	Apr 2019 Line of Credit Sep 2020 Mortgage + 2 more
Flood Zone	Zone X (minimal risk)
APN	`85A-6403-71`

Property Details

APN / Parcel Number

Primary APN	`85A-6403-71`
Alternative APN	`085A-6403-071-00`

Interior

Bedrooms	5 Beds
Full Baths	2.5 Baths
Half Baths	1 Half Bath
Total Rooms	10 Rooms
Stories	2 Stories
Building Area	2,519 sqft Living Area

Exterior

Year Built	Built 1985
Effective Year Built	Effective 1985
Architectural Style	L-Shape
Construction Type	Wood
Lot Area	5,880 sqft (0.135 acres)
Parking Spaces	2 Parking Spaces

Location & Zoning

Street Address	18805 MASTERSON PL
City	CASTRO VALLEY
State	CA
Zip	94552-5083
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT: 00068 BLK: TR: 4468
Legal Subdivision	TRACT NO 4468
Legal Tract	4468
Legal Lot Number	4468
Jurisdiction	ALAMEDA CA
Township / Civil Division	HAYWARD
Census Block Group	3
Census Block	3003
Census Tract	430101

Owner

18805 Masterson Pl is owned and occupied by two individuals who acquired it in April 2020.

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

Owner of Record	2 Individual Names on File
Mailing Address	18805 MASTERSON PL, CASTRO VALLEY, CA 94552-5083
Occupancy	Owner Occupied
Owner Type	Individual

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
Apr 29, 2019	Deed of Trust, Mortgage · Line of Credit FREMONT BANK
Sep 2, 2020	Deed of Trust, Mortgage · Conventional Mortgage OWNING CORPORATION
Nov 16, 2020	Deed of Trust, Mortgage · Line of Credit FREMONT BANK
Apr 21, 2020	Intrafamily Transfer, Transfer · Conventional Mortgage FREMONT BANK

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Oct 30, 2013 · Amount on File
Deed Sale	Oct 30, 2013 · Amount on File
Deed Document Number	2013348883
Last Transfer Date	Apr 2, 2020
Transfer Doc	0000089866
Record Updated	Oct 29, 2026

April 2019: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	18805 MASTERSON PL, CASTRO VALLEY, CA 94552-5083
Transaction Type	Mortgage
Record Updated	Jul 19, 2022
Title Company	FIDELITY NATIONAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000077159
Date	Apr 29, 2019
Instrument	2019077159

Lender

Name	FREMONT BANK
Type	Bank
Address	LIVERMORE, CA 94551

Agreement

Type	Line of Credit
Amount	Amount on Record
Term	360 Months
Due	Apr 23, 2049

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

September 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	18805 MASTERSON PL, CASTRO VALLEY, CA 94552-5083
Transaction Type	Mortgage
Record Updated	Jul 19, 2022

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	18805 MASTERSON PL, CASTRO VALLEY, CA 94552-5083

Mortgage

Document Number	0000219075
Date	Sep 2, 2020
Instrument	2020219075

Lender

Name	OWNING CORPORATION
Type	Non-Lending Institution
Address	ORANGE, CA 92868

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	360 Months
Due	Sep 1, 2050

November 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	18805 MASTERSON PL, CASTRO VALLEY, CA 94552-5083
Transaction Type	Mortgage
Record Updated	Jul 19, 2022
Title Company	SERVICELINK

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	18805 MASTERSON PL, CASTRO VALLEY, CA 94552-5083

Mortgage

Document Number	0000311909
Date	Nov 16, 2020
Instrument	2020311909

Lender

Name	FREMONT BANK
Type	Bank
Address	LIVERMORE, CA 94551

Agreement

Type	Line of Credit
Amount	Amount on Record
Term	360 Months
Due	Nov 1, 2050

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

April 2020: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	ALAMEDA CA
Recording Date	Apr 21, 2020
Property Address	18805 MASTERSON PL, CASTRO VALLEY, CA 94552-5083
Document Number	0000089866
Map Reference	MB 117 PG 1-14
Instrument Date	Apr 2, 2020
Instrument	2020089866
Transaction Type	Transfer
Record Updated	Jul 19, 2022
Title Company	FIDELITY NATIONAL TITLE

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	Joint Tenants
Address	18805 MASTERSON PL, CASTRO VALLEY, CA 94552-5083

Mortgage

Document Number	0000089867
Date	Apr 21, 2020
Instrument	2020089867

Lender

Name	FREMONT BANK
Type	Bank

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	May 1, 2050

Tax Assessment & Valuation

The 2025 property tax bill for 18805 Masterson Pl was $11,312.

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		$902,730 (+2%) Land $270,819 Building $631,911
2025	$11,312.00	$885,034 Land $265,510 Building $619,524
2023	$10,893.00	$850,674 Land $255,202 Building $595,472	$1,320,930

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

Flood

FEMA maps place 18805 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 18805 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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