Los Angeles County property record for 421 S Shamrock Ave, Monrovia, CA 91016
| Property Type | Single Family Home |
|---|---|
| Details | 1 bd · 1 ba · 745 sqft · built 1912 |
| Lot Size | 0.059 acres (2,568 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $88,000 (Apr 1994) |
| Tax Bill | $2,237 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 8517-008-016 |
| Primary APN | 8517-008-016 |
|---|
| Bedrooms | 1 Bed |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 5 Rooms |
| Stories | 1 Story |
| Building Area | 745 sqft Living Area |
| Year Built | Built 1912 |
|---|---|
| Effective Year Built | Effective 1912 |
| Architectural Style | Conventional |
| Exterior Material | Stucco |
| Construction Type | Wood |
| Roof Type | Gable |
| Roof Material | Composition Shingle |
| Lot Area | 2,568 sqft (0.059 acres) |
| Lot Dimensions | 69 ft deep x 40 ft wide |
| Heating System | Floor/Wall Furnace |
|---|
| Street Address | 421 S SHAMROCK AVE |
|---|---|
| City | MONROVIA |
| State | CA |
| Zip | 91016-3027 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | MORM* |
| Legal Description | AMENDED MAP OF THE PACIFIC VIEW TRACT N 40 FT OF LOT 14 BLK F |
| Legal Subdivision | AMENDED MAP OF PACIFIC VIEW TRACT |
| Legal Tract | N |
| Legal Block | F |
| Legal Lot Number | 14 |
| Jurisdiction | LOS ANGELES CA |
| Township / Civil Division | UPPER SAN GABRIEL VALLEY |
| Census Block Group | 1 |
| Census Block | 1019 |
| Census Tract | 431004 |
421 S Shamrock Ave is owner-occupied and held in a trust since April 1994.
Source: Los Angeles County records, as of August 25, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 421 S SHAMROCK AVE, MONROVIA, CA 91016-3027 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
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 | 2 Names on Deed |
|---|---|
| Last Sale | Apr 11, 1994 · Amount on File |
| Deed Sale | Apr 11, 1994 · Amount on File |
| Deed Document Number | 1994698077 |
| Prior Transfer Date | Oct 20, 1993 |
| Prior Transfer Doc | 0002168679 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 421 S Shamrock Ave was $2,237 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 | Monrovia City |
| Unified School District | Monrovia Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $152,528 (+2%) Land $122,033 Building $30,495 | |
| 2025 | $2,237.00 Homeowner's exemption | $149,539 Land $119,641 Building $29,898 |
| 2023 | $2,119.00 (+2.96%) Homeowner's exemption | $143,735 Land $114,997 Building $28,738 |
| 2022 | $2,058.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 421 S Shamrock Ave 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 421 S Shamrock Ave is low, with a 0.01% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 80% of the US · lower than 88% of California |
|---|---|
| Wildfire Likelihood | 0.01% 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 | MONROVIA-CITY, WATER DEPT. serves 37,931 people · EPA ID CA1910090 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Sep 2024 |
| 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 835 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Frontier Fiber | 5,000 / 5,000 |
| Spectrum Cable · Fiber in parts of the area | 1,000 / 1,000 |
| Giggle Fiber Cable | 1,000 / 40 |
| Verizon Fixed Wireless | 300 / 20 |
| AT&T Fixed Wireless | 100 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: GeoLinks.
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