Los Angeles County property record for 1233 Hillmar Dr, Diamond Bar, CA 91765
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 3 ba · 2,050 sqft · built 1978 |
| Lot Size | 0.29 acres (12,639 sqft) |
| Owner | 2 Company Names on File |
| Tax Bill | $5,222 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 8293-009-037 |
| Primary APN | 8293-009-037 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 11 Rooms |
| Stories | 2 Stories |
| Building Area | 2,050 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1978 |
|---|---|
| Effective Year Built | Effective 1978 |
| Architectural Style | Conventional |
| Exterior Material | Stucco |
| Construction Type | Wood |
| Roof Type | Gable |
| Roof Material | Tile |
| Lot Area | 12,639 sqft (0.29 acres) |
| Lot Dimensions | 151 ft deep x 86 ft wide |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Water Source | Commercial |
| Street Address | 1233 HILLMAR DR |
|---|---|
| City | DIAMOND BAR |
| State | CA |
| Zip | 91765-2414 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | LCR18000* |
| Legal Description | *TR=31677 LOT 17 |
| Legal Subdivision | 31677 |
| Legal Tract | 31677 |
| Legal Block | 1 |
| Legal Lot Number | 17 |
| Jurisdiction | LOS ANGELES CA |
| Township / Civil Division | EAST SAN GABRIEL VALLEY |
| Census Block Group | 1 |
| Census Block | 1009 |
| Census Tract | 403323 |
1233 Hillmar Dr is owned by a company that acquired it in October 1993 and is owner-occupied.
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 Company Names on File |
|---|---|
| Mailing Address | 1233 HILLMAR DR, DIAMOND BAR, CA 91765-2414 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Borrower in Default |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Transfer Date | Oct 26, 1993 |
| Transfer Doc | 0000370038 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 1233 Hillmar Dr was $5,222 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 | $369,658 (+2%) Land $147,861 Building $221,797 | |
| 2025 | $5,222.00 Homeowner's exemption | $362,411 Land $144,962 Building $217,449 |
| 2023 | $4,648.00 (+3.29%) Homeowner's exemption | $348,340 Land $139,334 Building $209,006 |
| 2022 | $4,500.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 1233 Hillmar 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 1233 Hillmar Dr is low, with a 0.04% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 67% of the US · lower than 81% of California |
|---|---|
| Wildfire Likelihood | 0.04% 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 368 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Spectrum Cable | 1,000 / 1,000 |
May also be available: GeoLinks, T-Mobile, Verizon.
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