Los Angeles County property record for 623 Alder Ln, Diamond Bar, CA 91789
| Property Type | Planned Unit Development |
|---|---|
| Details | 2 bd · 3 ba · 1,368 sqft · built 1986 |
| Lot Size | 0.033 acres (1,416 sqft) |
| Owner | 2 Company Names on Record |
| Tax Bill | $3,948 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 8719-018-032 |
| Primary APN | 8719-018-032 |
|---|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 4 Rooms |
| Stories | 2 Stories |
| Building Area | 1,368 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1986 |
|---|---|
| Effective Year Built | Effective 1986 |
| Architectural Style | Conventional |
| Construction Type | Wood |
| Roof Material | Composition Shingle |
| Lot Area | 1,416 sqft (0.033 acres) |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 623 ALDER LN |
|---|---|
| City | WALNUT |
| State | CA |
| Zip | 91789-3345 |
| Property Category | Residential |
| Property Type | Residential > Condominium / Townhouse > Planned Unit Development |
| Local Zoning Code | LCR312UDP* |
| Legal Description | TR=39833 LOT 32 |
| Legal Subdivision | 39833 |
| Legal Tract | 39833 |
| Legal Block | 3 |
| Legal Lot Number | 32 |
| Jurisdiction | LOS ANGELES CA |
| Township / Civil Division | EAST SAN GABRIEL VALLEY |
| Census Block Group | 3 |
| Census Block | 3001 |
| Census Tract | 403328 |
Source: Los Angeles County records, as of October 5, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Company Names on Record |
|---|---|
| Mailing Address | 111 KATHRYN ADELE LN, MOUNT JULIET, TN 37122-1575 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust, Personal Trust |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Transfer Date | Sep 2, 2014 |
| Transfer Doc | 0001018796 |
| 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 | $296,172 (+2%) Land $112,209 Building $183,963 | |
| 2025 | $3,948.00 (+8.73%) Homeowner's exemption | $290,365 (+4.04%) Land $110,009 Building $180,356 |
| 2023 | $3,631.00 (+2.22%) Homeowner's exemption | $279,091 Land $105,738 Building $173,353 |
| 2022 | $3,552.00 |
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
| 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.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 96% of the US · lower than 97.4% of California |
|---|---|
| Wildfire Likelihood | 0.02% 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 200 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 |
May also be available: GeoLinks, T-Mobile, Verizon.
Search by:
By searching, you agree to: Terms • Privacy • Disclosures