18908 Mount Lassen Dr, Castro Valley, CA 94552 Property Records

Alameda County property record for 18908 Mount Lassen Dr, Castro Valley, CA 94552

Property Summary

Property Type	Single Family Home
Details	4 bd · 3 ba · 2,738 sqft · built 1989
Lot Size	0.135 acres (5,900 sqft)
Owner	2 Individual Names on Record
Last Sale	$800,000 (Mar 2007)
Tax Bill	$14,209 (2025)
Deeds & Mortgages	Apr 2021 Mortgage Feb 2023 Line of Credit + 1 more
Flood Zone	Zone X (minimal risk)
APN	`85A-6408-87`

Property Details

APN / Parcel Number

Primary APN	`85A-6408-87`
Alternative APN	`085A-6408-087-00`

Interior

Bedrooms	4 Beds
Full Baths	3 Baths
Total Rooms	9 Rooms
Stories	2 Stories
Building Area	2,738 sqft Living Area

Exterior

Year Built	Built 1989
Effective Year Built	Effective 1995
Architectural Style	Custom Design
Construction Type	Wood
Lot Area	5,900 sqft (0.135 acres)

Location & Zoning

Street Address	18908 MOUNT LASSEN DR
City	CASTRO VALLEY
State	CA
Zip	94552-1919
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT: 00004 BLK: TR: 5500
Legal Subdivision	TRACT 5500
Legal Tract	5500
Legal Lot Number	4
Jurisdiction	ALAMEDA CA
Township / Civil Division	HAYWARD
Census Block Group	2
Census Block	2006
Census Tract	430101

Owner

Source: Alameda County records, as of August 5, 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 Record
Mailing Address	18908 MOUNT LASSEN DR, CASTRO VALLEY, CA 94552-1919
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Community Property

Deeds, Mortgages & Sale History

Date	Document
Apr 9, 2021	Deed of Trust, Mortgage · Conventional Mortgage QUICKEN LOANS LLC
Feb 27, 2023	Intrafamily Transfer, Transfer · Line of Credit FIRST REPUBLIC BANK
Apr 6, 2020	Deed of Trust, Mortgage · Conventional Mortgage QUICKEN LNS

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Mar 6, 2007 · Amount on Record
Deed Sale	Mar 6, 2007 · Amount on Record
Prior Sale	Jan 17, 2002 · Amount on Record
Deed Document Number	200795009
Last Transfer Date	Feb 10, 2023
Transfer Doc	0000024044
Record Updated	Oct 29, 2026

April 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	18908 MOUNT LASSEN DR, CASTRO VALLEY, CA 94552-1919
Transaction Type	Mortgage
Record Updated	Jun 8, 2026

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	18908 MOUNT LASSEN DR, CASTRO VALLEY, CA 94552-1919

Mortgage

Document Number	0000143246
Date	Apr 9, 2021
Instrument	2021143246

Lender

Name	QUICKEN LOANS LLC
Type	Mortgage Company
Address	DETROIT, MI 48226

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	May 1, 2051

Interest

Rate Type	Adjustable Rate
Rate	1.87%
Type Change Date	May 1, 2026
Change Frequency	Annually
Min Rate At Change	3%
Max Rate At Change	3.87%
Index	Other
Margin	3
Max Rate	6.87%

February 2023: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	ALAMEDA CA
Recording Date	Feb 27, 2023
Property Address	18908 MOUNT LASSEN DR, CASTRO VALLEY, CA 94552-1919
Document Number	0000024044
Map Reference	MB 160 PG 96-100
Instrument Date	Feb 10, 2023
Instrument	2023024044
Transaction Type	Transfer
Record Updated	Sep 28, 2023
Title Company	FIRSTAMERICAN TITLE COMPANY, FIRST AMERICAN TITLE COMPANY

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	18908 MOUNT LASSEN DR, CASTRO VALLEY, CA 94552-1919

Mortgage

Document Number	0000024045
Date	Feb 27, 2023
Instrument	2023024045

Lender

Name	FIRST REPUBLIC BANK
Type	Bank

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	300 Months
Due	Feb 26, 2048

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

April 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	18908 MOUNT LASSEN DR, CASTRO VALLEY, CA 94552-1919
Document Number	0000091322
Instrument Date	Apr 6, 2020
Transaction Type	Mortgage
Record Updated	Jun 17, 2020
Title Company	OTHER

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Husband and Wife
Address	18908 MOUNT LASSEN DR CASTRO VALLEY CA 945521919, CASTRO VALLEY, CA 94552-1919

Mortgage

Document Number	0000091322
Date	Apr 22, 2020
Instrument	91322

Lender

Name	QUICKEN LNS
Type	Funding / Finance Company
Address	DETROIT, MI 48226

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	360 Months
Due	Apr 21, 2050

Interest

Rate Type	Adjustable Rate
Rate	2.62%

Tax Assessment & Valuation

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		$1,153,102 (+2%) Land $327,952 Building $825,150
2025	$14,209.00 (+9.1%)	$1,130,495 (+9.74%) Land $321,523 Building $808,972
2023	$13,024.00	$1,030,135 Land $309,040 Building $721,095	$1,197,450

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

Flood

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

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

Wildfire Risk	High above 74% of the US · above 49% of California
Wildfire Likelihood	0.3% 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 207 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 · Fiber in parts of the area	100 / 20

May also be available: Etheric Networks.

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