18508 Mountain Ln, Castro Valley, CA 94552 Property Records

Alameda County property record for 18508 Mountain Ln, Castro Valley, CA 94552

Property Summary

Property Type	Single Family Home
Details	5 bd · 2 ba · 2,039 sqft · built 1963
Lot Size	0.312 acres (13,578 sqft)
Owner	2 Individual Names on File
Last Sale	$2,100,000 (Aug 2026)
Tax Bill	$20,926 (2025)
Deeds & Mortgages	Aug 2026 Sale & Mortgage May 2018 Sale & Mortgage + 3 more
Flood Zone	Zone X (minimal risk)
APN	`85-1606-40`

Property Details

APN / Parcel Number

Primary APN	`85-1606-40`
Alternative APN	`085-1606-040-00`

Interior

Bedrooms	5 Beds
Full Baths	2 Baths
Total Rooms	7 Rooms
Stories	1 Story
Building Area	2,039 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1963
Effective Year Built	Effective 1964
Architectural Style	H-Shape
Construction Type	Wood
Lot Area	13,578 sqft (0.312 acres)

Utilities, Heating & Cooling

Heating System	Radiant

Location & Zoning

Street Address	18508 MOUNTAIN LN
City	CASTRO VALLEY
State	CA
Zip	94552-1834
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT: 00003 BLK: 000B TR: 2295
Legal Subdivision	PORTION OF MOUNTAIN COURT
Legal Tract	2295
Legal Lot Number	3
Jurisdiction	ALAMEDA CA
Township / Civil Division	HAYWARD
Census Block Group	1
Census Block	1013
Census Tract	430102

Owner

18508 Mountain Ln is owned and occupied by two individuals who bought it in August 2026.

Source: Alameda County records, as of October 13, 2026

Owner of Record	2 Individual Names on File
Mailing Address	18508 MOUNTAIN LN, CASTRO VALLEY, CA 94552-1834
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Joint Tenants

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 19, 2026	Grant Deed, Transfer · Conventional Mortgage CROSSCOUNTRY MORTGAGE
May 4, 2018	Grant Deed, Transfer OPES ADVISORS
Mar 30, 2018	Quit Claim Deed, Transfer ATTORNEY ONLY
Nov 8, 2017	Grant Deed, Transfer PLACER TITLE COMPANY
Aug 21, 2017	Grant Deed, Transfer · Line of Credit LENDINGHOME FUNDING CORP

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Aug 19, 2026 · Amount on File
Deed Sale	Aug 19, 2026 · Amount on File
Prior Sale	May 4, 2018 · Amount on File
Deed Document Number	2026106736
Prior Transfer Date	Mar 6, 2016
Prior Transfer Doc	0000063678
Record Updated	Oct 29, 2026

August 2026: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	ALAMEDA CA
Recording Date	Aug 19, 2026
Property Address	18508 MOUNTAIN LN, CASTRO VALLEY, CA 94552-1834
Document Number	0000106736
Instrument Date	Aug 11, 2026
Instrument	2026106736
Transaction Type	Transfer
Record Updated	Sep 30, 2026
Title Company	REPUBLIC TITLE COMPANY, OLD REPUBLIC TITLE COMPANY

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$233,310.00
Amount Accuracy	Full Amount Stated
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants
Address	18508 MOUNTAIN LN, CASTRO VALLEY, CA 94552-1834

Mortgage

Document Number	0000106737,
Date	Aug 19, 2026
Instrument	2026106737

Lender

Name	CROSSCOUNTRY MORTGAGE

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	360 Months
Due	Sep 1, 2056

Interest

Rate Type	Fixed Rate
Initial Type	Fixed Rate
Max Rate	-1%

May 2018: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	ALAMEDA CA
Recording Date	May 4, 2018
Property Address	18508 MOUNTAIN LN, CASTRO VALLEY, CA 94552-1834
Document Number	0000090145
Instrument Date	May 1, 2018
Instrument	90145
Transaction Type	Transfer
Record Updated	May 23, 2018
Title Company	CHICAGO TITLE COMPANY

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$1,650.00
Amount Accuracy	Full Value
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Community Property
Address	18508 MOUNTAIN LN CASTRO VALLEY CA 945521834, CASTRO VALLEY, CA 94552-1834

Mortgage

Document Number	90146
Date	May 4, 2018
Instrument	90146

Lender

Name	OPES ADVISORS
Address	TROY, MI 48098

Agreement

Amount	Amount on Record
Term	360 Months
Due	May 3, 2048

March 2018: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	ALAMEDA CA
Recording Date	Mar 30, 2018
Property Address	18508 MOUNTAIN LN, CASTRO VALLEY, CA 94552-1834
Document Number	0000065697
Instrument Date	Dec 1, 2017
Instrument	65697
Transaction Type	Transfer
Record Updated	Apr 12, 2018
Title Company	ATTORNEY ONLY

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Living Trust
Address	9426 BLESSING DR PLEASANTON CA 945884605, PLEASANTON, CA 94588-4605

November 2017: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	ALAMEDA CA
Recording Date	Nov 8, 2017
Property Address	18508 MOUNTAIN LN, CASTRO VALLEY, CA 94552-1834
Document Number	0000246893
Instrument Date	Oct 24, 2017
Instrument	246893
Transaction Type	Transfer
Record Updated	Dec 6, 2017
Title Company	PLACER TITLE COMPANY

Transaction

Amount	Amount on Record
Tax	$951.00
Amount Accuracy	Full Value
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Living Trust
Address	PO BOX 115 PLEASANTON CA 945660011, PLEASANTON, CA 94566-0011

August 2017: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	ALAMEDA CA
Recording Date	Aug 21, 2017
Property Address	18508 MOUNTAIN LN, CASTRO VALLEY, CA 94552-1834
Document Number	0000182855
Map Reference	MB45 PG8
Instrument Date	Aug 9, 2017
Instrument	2017182855
Transaction Type	Transfer
Record Updated	Aug 19, 2021
Title Company	PLACER TITLE COMPANY

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
Address	7388 N REMINGTON AVE STE 101, 101, FRESNO, CA 93711-5721
Investor	Possibly a Property Investor

Mortgage

Document Number	0000182856
Date	Aug 21, 2017
Instrument	2017182856

Lender

Name	LENDINGHOME FUNDING CORP
Type	Funding / Finance Company

Agreement

Type	Line of Credit
Amount	Amount on Record

Tax Assessment & Valuation

The 2025 property tax bill for 18508 Mountain Ln was $20,926.

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		$1,733,840 (+1.59%) Land $522,252 Building $1,218,588
2025	$20,926.00 Homeowner's exemption	$1,706,714 Land $512,014 Building $1,194,700
2023	$20,185.00 Homeowner's exemption	$1,640,444 Land $492,133 Building $1,148,311	$1,440,900

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

Flood

FEMA maps place 18508 Mountain Ln in Zone X, an area of minimal flood risk.

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

Wildfire risk around 18508 Mountain Ln is high, ranking above 71% of the US, with a 0.3% annual chance of wildfire.

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

Wildfire Risk	High above 71% of the US · above 46% 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 389 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
AT&T Fiber · DSL in parts of the area	5,000 / 5,000
Xfinity Cable	2,000 / 250
Verizon Fixed Wireless	300 / 20
Etheric Networks Fixed Wireless	250 / 100
T-Mobile Fixed Wireless	100 / 20

May also be available: Unwired.

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