Los Angeles County property record for 21865 Copley Dr, Diamond Bar, CA 91765
| Property Type | Commercial Office |
|---|---|
| Lot Size | 20 acres (875,328 sqft) |
| Owner | 2 Company Names on File |
| Flood Zone | Zone X (minimal risk) |
| APN | 8293-050-900 |
| Primary APN | 8293-050-900 |
|---|
| Stories | 1 Story |
|---|
| Lot Area | 875,328 sqft |
|---|
| Street Address | 21865 COPLEY DR |
|---|---|
| City | DIAMOND BAR |
| State | CA |
| Zip | 91765-4178 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Commercial Office |
| Local Zoning Code | LCR110000* |
| Legal Description | TR=39679 LOT 1 |
| Legal Subdivision | 39679 |
| Legal Tract | 39679 |
| Legal Block | 1 |
| Legal Lot Number | 1 |
| Jurisdiction | LOS ANGELES CA |
| Township / Civil Division | EAST SAN GABRIEL VALLEY |
| Census Block Group | 1 |
| Census Block | 1013 |
| Census Tract | 403323 |
21865 Copley Dr, a commercial property, is owned by a company.
Source: Los Angeles County records, as of August 25, 2026
| Owner of Record | 2 Company Names on File |
|---|---|
| Mailing Address | 21865 COPLEY DR, DIAMOND BAR, CA 91765-4178 |
| Owner Type | Company |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | 2 Names on Deed |
|---|---|
| Record Updated | Oct 29, 2026 |
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 | Assessed Value |
|---|---|
| 2026 | $8,750,000 (-) Land $8,750,000 |
| 2025 | $8,750,000 Land $8,750,000 |
| 2023 | $8,750,000 Land $8,750,000 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 21865 Copley 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 risk around 21865 Copley Dr is low, with a 0.01% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 97% of the US · lower than 97.8% of California |
|---|---|
| Wildfire Likelihood | 0.01% annual chance |
| Exposure | None beyond 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 130 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Spectrum Cable | 1,000 / 35 |
| Verizon Fixed Wireless | 300 / 20 |
| Starlink Satellite | 280 / 30 |
May also be available: AT&T, GeoLinks, T-Mobile.
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