Los Angeles County property record for 423 Deep Hill Rd, Diamond Bar, CA 91765
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,553 sqft · built 1975 |
| Lot Size | 0.208 acres (9,055 sqft) |
| Owner | 2 Trust Names on File |
| Tax Bill | $4,705 (2025) |
| Deeds & Mortgages | Jul 2022 Mortgage Apr 2022 Transfer + 3 more |
| Flood Zone | Zone X (minimal risk) |
| APN | 8718-020-018 |
| Primary APN | 8718-020-018 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 8 Rooms |
| Stories | 1 Story |
| Building Area | 1,553 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1975 |
|---|---|
| Effective Year Built | Effective 1975 |
| Architectural Style | Conventional |
| Exterior Material | Stucco |
| Construction Type | Wood |
| Roof Type | Gable |
| Roof Material | Wood Shingle |
| Lot Area | 9,055 sqft (0.208 acres) |
| Lot Dimensions | 135 ft deep x 66 ft wide |
| Garage Type | Attached |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Water Source | Commercial |
| Street Address | 423 DEEP HILL RD |
|---|---|
| City | DIAMOND BAR |
| State | CA |
| Zip | 91765-1204 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | LCR18000* |
| Legal Description | TRACT NO 28065 LOT 24 |
| Legal Subdivision | 28065 |
| Legal Tract | 28065 |
| Legal Block | 1 |
| Legal Lot Number | 24 |
| Jurisdiction | LOS ANGELES CA |
| Township / Civil Division | EAST SAN GABRIEL VALLEY |
| Census Block Group | 1 |
| Census Block | 1018 |
| Census Tract | 403327 |
423 Deep Hill Rd is owner-occupied and held in a trust since July 2022.
Source: Los Angeles County records, as of August 25, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 423 DEEP HILL RD, DIAMOND BAR, CA 91765-1204 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust, Family Trust |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Jul 20, 2022 | Intrafamily Transfer, Transfer · Closed-End Mortgage UNITED CATHOLICS FCU |
| Apr 28, 2022 | Intrafamily Transfer, Transfer |
| Jul 20, 2022 | Intrafamily Transfer, Transfer FIRST AMERICAN TITLE COMPANY |
| Dec 31, 2018 | Deed of Trust, Mortgage · Line of Credit UNITED CATHOLICS FCU |
| Feb 13, 2020 | Deed of Trust, Mortgage · Line of Credit UNITED CATHOLICS FCU |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Transfer Date | Jul 13, 2022 |
| Transfer Doc | 0000741990 |
| Record Updated | Oct 29, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | LOS ANGELES CA |
| Recording Date | Jul 20, 2022 |
| Property Address | 423 DEEP HILL RD, DIAMOND BAR, CA 91765-1204 |
| Document Number | 0000741990 |
| Map Reference | MB 839 PG 35-36 |
| Instrument Date | Jul 13, 2022 |
| Instrument | 22-0741990 |
| Transaction Type | Transfer |
| Record Updated | Jul 28, 2022 |
| Title Company | FIRSTAMERICAN TITLE COMPANY, FIRST AMERICAN TITLE COMPANY |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|---|
| Address | 423 DEEP HILL RD, 423, DIAMOND BAR, CA 91765-1204 |
| Name | Verified Name |
|---|---|
| Relationship | Joint Tenants |
| Address | 423 DEEP HILL RD, DIAMOND BAR, CA 91765-1204 |
| Document Number | 0000741991 |
|---|---|
| Date | Jul 20, 2022 |
| Instrument | 22-0741991 |
| Name | UNITED CATHOLICS FCU |
|---|---|
| Type | Credit Union |
| Type | Closed-End Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 120 Months |
| Due | Jul 15, 2032 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | LOS ANGELES CA |
| Recording Date | Apr 28, 2022 |
| Property Address | 423 DEEP HILL RD, DIAMOND BAR, CA 91765-1204 |
| Document Number | 0000464574 |
| Map Reference | MB 839 PG 35--36 |
| Instrument Date | Apr 21, 2022 |
| Instrument | 22-0464574 |
| Transaction Type | Transfer |
| Record Updated | Jun 7, 2023 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Family Trust |
| Address | 423 DEEP HILL RD, DIAMOND BAR, CA 91765-1204 |
| Investor | Possibly a Property Investor |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | LOS ANGELES CA |
| Recording Date | Jul 20, 2022 |
| Property Address | 423 DEEP HILL RD, DIAMOND BAR, CA 91765-1204 |
| Document Number | 0000741992 |
| Map Reference | MB 839 PG 35-36 |
| Instrument Date | Apr 21, 2022 |
| Instrument | 22-0741992 |
| Transaction Type | Transfer |
| Record Updated | Jun 7, 2023 |
| Title Company | FIRST AMERICAN TITLE COMPANY |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Family Trust |
| Address | 423 DEEP HILL RD, DIAMOND BAR, CA 91765-1204 |
| Investor | Possibly a Property Investor |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | LOS ANGELES CA |
| Property Address | 423 DEEP HILL RD, DIAMOND BAR, CA 91765-1204 |
| Transaction Type | Mortgage |
| Record Updated | Feb 5, 2021 |
| Title Company | AMERICAN TITLE COMPANY |
| Name | Verified Name |
|---|
| Document Number | 0001319891 |
|---|---|
| Date | Dec 31, 2018 |
| Instrument | 18-1319891 |
| Name | UNITED CATHOLICS FCU |
|---|---|
| Type | Credit Union |
| Address | COVINA, CA 91723 |
| Type | Line of Credit |
|---|---|
| Amount | Amount on Record |
| Term | 85 Months |
| Due | Jan 5, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | LOS ANGELES CA |
| Property Address | 423 DEEP HILL RD, DIAMOND BAR, CA 91765-1204 |
| Transaction Type | Mortgage |
| Record Updated | Feb 5, 2021 |
| Title Company | FIRST AMERICAN TITLE COMPANY |
| Name | Verified Name |
|---|
| Document Number | 0000179941 |
|---|---|
| Date | Feb 13, 2020 |
| Instrument | 20-0179941 |
| Name | UNITED CATHOLICS FCU |
|---|---|
| Type | Credit Union |
| Address | COVINA, CA 91723 |
| Type | Line of Credit |
|---|---|
| Amount | Amount on Record |
| Term | 121 Months |
| Due | Mar 1, 2030 |
The 2025 property tax bill for 423 Deep Hill Rd was $4,705 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 | Pomona Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $325,356 (+2%) Land $130,135 Building $195,221 | |
| 2025 | $4,705.00 Homeowner's exemption | $318,978 Land $127,584 Building $191,394 |
| 2023 | $4,202.00 (+1.67%) Homeowner's exemption | $306,594 Land $122,631 Building $183,963 |
| 2022 | $4,133.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 423 Deep Hill Rd 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 423 Deep Hill Rd 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 65% of the US · lower than 79% 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 355 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 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T Fixed Wireless | 100 / 20 |
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