20451 Gernside Dr, Diamond Bar (Walnut), CA 91789 Property Records

Los Angeles County property record for 20451 Gernside Dr, Diamond Bar, CA 91789

Property Summary

Property Type	Single Family Home
Details	4 bd · 3 ba · 2,307 sqft · built 1975
Lot Size	0.218 acres (9,509 sqft)
Owner	2 Company Names on File
Last Sale	$239,000 (Feb 1996)
Tax Bill	$5,516 (2025)
Flood Zone	Zone X (minimal risk)
APN	`8763-021-013`

Property Details

APN / Parcel Number

Primary APN	`8763-021-013`

Interior

Bedrooms	4 Beds
Full Baths	3 Baths
Building Area	2,307 sqft Living Area

Exterior

Year Built	Built 1975
Effective Year Built	Effective 1975
Construction Type	Wood
Lot Area	9,509 sqft (0.218 acres)

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	20451 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 115
Legal Subdivision	32109
Legal Tract	32109
Legal Block	3
Legal Lot Number	115
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 · APN 8763-021-013

Assessment roll updated May 21, 2026 · Last verified June 2026

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record	2 Company Names on File
Mailing Address	20451 GERNSIDE DR, WALNUT, CA 91789-3738
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Borrower in Default

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Verified Names on Deed
Last Sale	Feb 29, 1996 · Amount on Record
Deed Sale	Feb 29, 1996 · Amount on Record
Prior Sale	Oct 18, 1995 · Amount on Record
Deed Document Number	1996326315
Last Transfer Date	Sep 09, 2010
Transfer Doc	0000563771
Record Updated	Sep 20, 2026

Tax Assessment & Valuation

Source: Los Angeles County records · Assessment roll updated May 21, 2026 · Last verified June 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

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

Year	Tax Bill	Assessed Value
2025	$5,516.00 (+9.31%) Homeowner's exemption	$397,017 (+4.04%) Land $183,723 Building $213,294
2023	$5,046.00 (+2.13%) Homeowner's exemption	$381,602 Land $176,590 Building $205,012
2022	$4,941.00

Flood & Wildfire

Source: FEMA National Flood Hazard Layer as of September 30, 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 2026

Flood

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it

Wildfire

Wildfire Risk	Not rated no burnable land within ember reach

Values are read at the parcel center point; lenders make the official flood determination.

Internet Providers

Source: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026

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

May also be available: AT&T, California Internet, Verizon.

Based on FCC filings for 458 locations within half a mile of this property.

Drinking Water

Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026

Water System	WALNUT VALLEY WATER DISTRICT serves 100,941 people
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 as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.