20503 Gernside Dr, Diamond Bar (Walnut), CA 91789 Property Records

Los Angeles County property record for 20503 Gernside Dr, Diamond Bar, CA 91789

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,609 sqft · built 1975
Lot Size	0.216 acres (9,406 sqft)
Owner	2 Individual Names on File
Last Sale	$346,000 (Dec 2002)
Tax Bill	$6,738 (2025)
Deeds & Mortgages	Aug 2019 Line of Credit Feb 2017 Mortgage
Flood Zone	Zone X (minimal risk)
APN	`8763-021-011`

Property Details

APN / Parcel Number

Primary APN	`8763-021-011`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Building Area	1,609 sqft Living Area

Exterior

Year Built	Built 1975
Effective Year Built	Effective 1975
Construction Type	Wood
Lot Area	9,406 sqft (0.216 acres)

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	20503 GERNSIDE DR
City	WALNUT
State	CA
Zip	91789-3740
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	LCR110000*
Legal Description	TRACT NO 32109 LOT 113
Legal Subdivision	32109
Legal Tract	32109
Legal Block	3
Legal Lot Number	113
Jurisdiction	LOS ANGELES CA
Township / Civil Division	EAST SAN GABRIEL VALLEY
Census Block Group	3
Census Block	3009
Census Tract	408707

Owner

20503 Gernside Dr is owned and occupied by two individuals who bought it in December 2002.

Source: Los Angeles County records, as of August 25, 2026

Owner of Record	2 Individual Names on File
Mailing Address	20503 GERNSIDE DR, WALNUT, CA 91789-3740
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 23, 2019	Deed of Trust, Mortgage · Line of Credit WELLS FARGO BANK NA
Feb 9, 2017	Deed of Trust, Mortgage · Conventional Mortgage STEARNS LNDG

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Dec 24, 2002 · Amount on File
Deed Sale	Dec 24, 2002 · Amount on File
Prior Sale	Oct 8, 1999 · Amount on File
Deed Document Number	20023163268
Prior Transfer Date	Aug 18, 1998
Prior Transfer Doc	0001584315
Record Updated	Oct 29, 2026

August 2019: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	20503 GERNSIDE DR, DIAMOND BAR, CA 91789-3740
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	ACCURATE GROUP LLC

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000854456
Date	Aug 23, 2019
Instrument	19-0854456

Lender

Name	WELLS FARGO BANK NA
Type	Bank
Address	SIOUX FALLS, SD 57104

Agreement

Type	Line of Credit
Amount	Amount on Record
Term	361 Months
Due	Sep 2, 2049

February 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	20503 GERNSIDE DR, DIAMOND BAR, CA 91789-3740
Document Number	0000193693
Instrument Date	Feb 9, 2017
Transaction Type	Mortgage
Record Updated	Feb 22, 2017
Title Company	WFG TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants with Right of Survivorship
Address	20503 GERNSIDE DR DIAMOND BAR CA 917893740, DIAMOND BAR, CA 91789-3740

Mortgage

Document Number	0000193693
Date	Feb 16, 2017
Instrument	193693

Lender

Name	STEARNS LNDG
Address	SANTA ANA, CA 92707-8788

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	180 Months
Due	Feb 15, 2032

Tax Assessment & Valuation

The 2025 property tax bill for 20503 Gernside Dr was $6,738.

Source: Los Angeles County assessment roll, as of August 25, 2026

Property Jurisdictions

Type	Name
State	California
County	Los Angeles County
Municipality	Diamond Bar City
Unified School District	Walnut Valley Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$510,825 (+2%) Land $387,188 Building $123,637
2025	$6,738.00	$500,810 Land $379,597 Building $121,213
2023	$6,213.00 (+2.1%)	$481,364 Land $364,857 Building $116,507
2022	$6,085.00

Assessed value is set for property tax purposes and is not a market price estimate.

Flood

FEMA maps place 20503 Gernside Dr in Zone X, an area of minimal flood risk.

Source: FEMA National Flood Hazard Layer, effective September 30, 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

The area around 20503 Gernside Dr has no burnable land within ember reach, so its wildfire risk is not rated.

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

Wildfire Risk	Not rated no burnable land within ember reach

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	WALNUT VALLEY WATER DISTRICT serves 100,941 people · EPA ID CA1910234
Water Source	Purchased surface water from several systems
Last State Inspection	Jun 2023
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.

Internet Providers

Source: FCC Broadband Data Collection, based on 458 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Frontier Fiber	7,000 / 7,000
Spectrum Cable	1,000 / 1,000
T-Mobile Fixed Wireless	100 / 20

May also be available: AT&T, GeoLinks, Verizon.

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