Los Angeles County property record for 20559 Crestline Dr, Diamond Bar, CA 91765
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 4 ba · 3,453 sqft · built 1996 |
| Lot Size | 0.248 acres (10,793 sqft) |
| Owner | 2 Individual Names on Record |
| Last Sale | $1,360,000 (Nov 2016) |
| Tax Bill | $19,715 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 8269-090-028 |
| Primary APN | 8269-090-028 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 4 Baths |
| Building Area | 3,453 sqft Living Area |
| Year Built | Built 1996 |
|---|---|
| Effective Year Built | Effective 1996 |
| Construction Type | Wood |
| Lot Area | 10,793 sqft (0.248 acres) |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 20559 CRESTLINE DR |
|---|---|
| City | DIAMOND BAR |
| State | CA |
| Zip | 91765-4708 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | LCR18000-R |
| Legal Description | TR=44478 LOT 51 |
| Legal Subdivision | 44478 |
| Legal Tract | 44478 |
| Legal Block | 3 |
| Legal Lot Number | 51 |
| Jurisdiction | LOS ANGELES CA |
| Township / Civil Division | EAST SAN GABRIEL VALLEY |
| Census Block Group | 3 |
| Census Block | 3000 |
| Census Tract | 408703 |
Source: Los Angeles County records, as of August 25, 2026
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Owner of Record | 2 Individual Names on Record |
|---|---|
| Mailing Address | 20559 CRESTLINE DR, DIAMOND BAR, CA 91765-4708 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Nov 1, 2016 · Amount on Record |
| Deed Sale | Nov 1, 2016 · Amount on Record |
| Prior Sale | Mar 18, 2015 · Amount on Record |
| Deed Document Number | 20161349174 |
| Prior Transfer Date | Mar 30, 2013 |
| Prior Transfer Doc | 0000500766 |
| 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 | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $1,609,957 (+2%) Land $591,897 Building $1,018,060 | |
| 2025 | $19,715.00 (+8.18%) | $1,578,391 (+4.04%) Land $580,292 Building $998,099 |
| 2023 | $18,225.00 (+2.11%) | $1,517,102 Land $557,759 Building $959,343 |
| 2022 | $17,849.00 |
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 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 6 (20% premium discount) |
| Nearby Flood Policies | 1 in force |
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Moderate above 62% of the US · lower than 62% of California |
|---|---|
| Wildfire Likelihood | 0.2% 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 257 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 / 50 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T Fixed Wireless | 100 / 20 |
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