Los Angeles County property record for 20551 Crestline Dr, Diamond Bar, CA 91765
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 5 ba · 3,537 sqft · built 1996 |
| Lot Size | 0.27 acres (11,775 sqft) |
| Owner | Individual Name on File |
| Last Sale | $1,000,000 (Jul 2010) |
| Tax Bill | $16,761 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 8269-090-027 |
| Primary APN | 8269-090-027 |
|---|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 5 Baths |
| Building Area | 3,537 sqft Living Area |
| Year Built | Built 1996 |
|---|---|
| Effective Year Built | Effective 1996 |
| Construction Type | Wood |
| Lot Area | 11,775 sqft (0.27 acres) |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 20551 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 50 |
| Legal Subdivision | 44478 |
| Legal Tract | 44478 |
| Legal Block | 3 |
| Legal Lot Number | 50 |
| Jurisdiction | LOS ANGELES CA |
| Township / Civil Division | EAST SAN GABRIEL VALLEY |
| Census Block Group | 3 |
| Census Block | 3000 |
| Census Tract | 408703 |
20551 Crestline Dr is owned and occupied by an individual who bought it in July 2010.
Source: Los Angeles County records, as of August 25, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 20551 CRESTLINE DR, DIAMOND BAR, CA 91765-4708 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
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 | Name on Deed |
|---|---|
| Last Sale | Jul 22, 2010 · Amount on File |
| Deed Sale | Jul 22, 2010 · Amount on File |
| Prior Sale | Jul 15, 1996 · Amount on File |
| Deed Document Number | 20101006543 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 20551 Crestline Dr was $16,761 with a homeowner's exemption.
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 | $1,355,287 (+2%) Land $784,074 Building $571,213 | |
| 2025 | $16,761.00 Homeowner's exemption | $1,328,713 Land $768,700 Building $560,013 |
| 2023 | $15,481.00 (+2.44%) Homeowner's exemption | $1,277,119 Land $738,851 Building $538,268 |
| 2022 | $15,112.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 20551 Crestline Dr in Zone X, an area of minimal flood risk.
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.
Wildfire risk around 20551 Crestline Dr is moderate, ranking above 62% of the US, with a 0.2% annual chance of wildfire.
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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