Los Angeles County property record for 20559 Gernside Dr, Diamond Bar, CA 91789
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 3 ba · 2,304 sqft · built 1975 |
| Lot Size | 0.206 acres (8,959 sqft) |
| Owner | 2 Company Names on Record |
| Tax Bill | $3,128 (2025) |
| Deeds & Mortgages | Mar 2018 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 8763-021-004 |
| Primary APN | 8763-021-004 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 3 Baths |
| Building Area | 2,304 sqft Living Area |
| Year Built | Built 1975 |
|---|---|
| Effective Year Built | Effective 1975 |
| Construction Type | Wood |
| Lot Area | 8,959 sqft (0.206 acres) |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 20559 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 106 |
| Legal Subdivision | 32109 |
| Legal Tract | 32109 |
| Legal Block | 3 |
| Legal Lot Number | 106 |
| Jurisdiction | LOS ANGELES CA |
| Township / Civil Division | EAST SAN GABRIEL VALLEY |
| Census Block Group | 3 |
| Census Block | 3009 |
| 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 | 2 Company Names on Record |
|---|---|
| Mailing Address | 20559 GERNSIDE DR, WALNUT, CA 91789-3740 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust, Family Trust |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Transfer Date | Dec 15, 2017 |
| Transfer Doc | 0000213193 |
| Record Updated | Oct 29, 2026 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | LOS ANGELES CA |
| Recording Date | Mar 5, 2018 |
| Property Address | 20559 GERNSIDE DR, DIAMOND BAR, CA 91789-3740 |
| Document Number | 0000213193 |
| Instrument Date | Dec 15, 2017 |
| Instrument | 213193 |
| Transaction Type | Transfer |
| Record Updated | Mar 20, 2018 |
| Title Company | ATTORNEY ONLY |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Personal Trust |
| Address | 20559 GERNSIDE DR WALNUT CA 917893740, WALNUT, CA 91789-3740 |
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 | $198,461 (+2%) Land $38,213 Building $160,248 | |
| 2025 | $3,128.00 (+12.32%) Homeowner's exemption | $194,570 (+4.04%) Land $37,464 Building $157,106 |
| 2023 | $2,785.00 (+2.2%) Homeowner's exemption | $187,016 Land $36,010 Building $151,006 |
| 2022 | $2,725.00 |
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 | 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.
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 496 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: GeoLinks, Verizon.
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