20459 Gernside Dr, Diamond Bar (Walnut), CA 91789 Property Records

Los Angeles County property record for 20459 Gernside Dr, Diamond Bar, CA 91789

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,767 sqft · built 1975
Lot Size	0.215 acres (9,375 sqft)
Owner	2 Individual Names on Record
Last Sale	$486,000 (May 2011)
Tax Bill	$8,129 (2025)
Deeds & Mortgages	Sep 2020 Mortgage Jun 2018 Mortgage
Flood Zone	Zone X (minimal risk)
APN	`8763-021-012`

Property Details

APN / Parcel Number

Primary APN	`8763-021-012`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Building Area	1,767 sqft Living Area

Exterior

Year Built	Built 1975
Effective Year Built	Effective 1975
Construction Type	Wood
Lot Area	9,375 sqft (0.215 acres)

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	20459 GERNSIDE DR
City	WALNUT
State	CA
Zip	91789-3738
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	LCR110000*
Legal Description	TRACT NO 32109 LOT 114
Legal Subdivision	32109
Legal Tract	32109
Legal Block	3
Legal Lot Number	114
Jurisdiction	LOS ANGELES CA
Township / Civil Division	EAST SAN GABRIEL VALLEY
Census Block Group	3
Census Block	3009
Census Tract	408707

Owner

Source: Los Angeles County records, as of August 25, 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	20459 GERNSIDE DR, WALNUT, CA 91789-3738
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Joint Tenants

Deeds, Mortgages & Sale History

Date	Document
Sep 8, 2020	Deed of Trust, Mortgage · Conventional Mortgage PENNYMAC LOAN SERVICES LLC
Jun 20, 2018	Deed of Trust, Mortgage · Conventional Mortgage PENNYMAC

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	May 13, 2011 · Amount on Record
Deed Sale	May 13, 2011 · Amount on Record
Prior Sale	Nov 18, 2010
Deed Document Number	2011681769
Prior Transfer Date	Feb 14, 2007
Prior Transfer Doc	0000370755
Record Updated	Oct 29, 2026

September 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	20459 GERNSIDE DR, DIAMOND BAR, CA 91789-3738
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	SERVICELINK

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	20459 GERNSIDE DR, WALNUT, CA 91789-3738

Mortgage

Document Number	0001070734
Date	Sep 8, 2020
Instrument	20-1070734

Lender

Name	PENNYMAC LOAN SERVICES LLC
Type	Mortgage Company
Address	WESTLAKE VILLAGE, CA 91361

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	252 Months
Due	Sep 1, 2041

June 2018: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	20459 GERNSIDE DR, DIAMOND BAR, CA 91789-3738
Document Number	0000667483
Instrument Date	Jun 20, 2018
Transaction Type	Mortgage
Record Updated	Jul 12, 2018
Title Company	SERVICELINK

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants with Right of Survivorship
Address	20459 GERNSIDE DR WALNUT CA 917893738, WALNUT, CA 91789-3738

Mortgage

Document Number	0000667483
Date	Jul 3, 2018
Instrument	667483

Lender

Name	PENNYMAC
Address	WESTLAKE VILLAGE, CA 91361

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	300 Months
Due	Jul 2, 2043

Tax Assessment & Valuation

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		$634,439 (+2%) Land $441,169 Building $193,270
2025	$8,129.00 (+8.03%)	$622,000 (+4.04%) Land $432,519 Building $189,481
2023	$7,525.00 (+2.13%)	$597,849 Land $415,725 Building $182,124
2022	$7,368.00

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

Flood

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

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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