Los Angeles County property record for 20403 Gernside Dr, Diamond Bar, CA 91789
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,767 sqft · built 1975 |
| Lot Size | 0.219 acres (9,520 sqft) |
| Owner | Individual Name on Record |
| Last Sale | $567,000 (Mar 2014) |
| Tax Bill | $8,978 (2025) |
| Deeds & Mortgages | May 2019 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 8763-023-004 |
| Primary APN | 8763-023-004 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Building Area | 1,767 sqft Living Area |
| Year Built | Built 1975 |
|---|---|
| Effective Year Built | Effective 1975 |
| Construction Type | Wood |
| Lot Area | 9,520 sqft (0.219 acres) |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 20403 GERNSIDE DR |
|---|---|
| City | WALNUT |
| State | CA |
| Zip | 91789-3737 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | LCR110000* |
| Legal Description | TRACT NO 32109 LOT 4 |
| Legal Subdivision | 32109 |
| Legal Tract | 32109 |
| Legal Block | 3 |
| Legal Lot Number | 4 |
| Jurisdiction | LOS ANGELES CA |
| Township / Civil Division | EAST SAN GABRIEL VALLEY |
| Census Block Group | 3 |
| Census Block | 3008 |
| Census Tract | 408707 |
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 | Individual Name on Record |
|---|---|
| Mailing Address | 20403 GERNSIDE DR, WALNUT, CA 91789-3737 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Sole Owner |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Mar 4, 2014 · Amount on Record |
| Deed Sale | Mar 4, 2014 · Amount on Record |
| Deed Document Number | 2014220544 |
| Prior Transfer Date | Feb 21, 2014 |
| Prior Transfer Doc | 0000220543 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | LOS ANGELES CA |
| Property Address | 20403 GERNSIDE DR, DIAMOND BAR, CA 91789-3737 |
| Transaction Type | Mortgage |
| Record Updated | Feb 5, 2021 |
| Title Company | WFG NATIONAL TITLE COMPANY |
| Name | Verified Name |
|---|
| Document Number | 0000454677 |
|---|---|
| Date | May 17, 2019 |
| Instrument | 19-0454677 |
| Name | NMSI INC |
|---|---|
| Type | Mortgage Company |
| Address | LOS ANGELES, CA 90010 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 361 Months |
| Due | Jun 1, 2049 |
Source: Los Angeles County assessment roll, as of August 25, 2026
| Type | Name |
|---|---|
| State | California |
| County | Los Angeles County |
| Municipality | Diamond Bar City |
| Unified School District | Walnut Valley Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $708,957 (+2%) Land $547,537 Building $161,420 | |
| 2025 | $8,978.00 (+7.48%) | $695,056 (+4.04%) Land $536,801 Building $158,255 |
| 2023 | $8,353.00 (+2.11%) | $668,067 Land $515,957 Building $152,110 |
| 2022 | $8,180.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
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.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 95% of the US · lower than 97% of California |
|---|---|
| Wildfire Likelihood | 0.03% annual chance |
| Exposure | Direct burnable vegetation |
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
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 |
| 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.
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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