San Mateo County property record for 850 4th Ave, Half Moon Bay, CA 94019
| Property Type | Duplex |
|---|---|
| Details | 6 bd · 4 ba · 3,630 sqft · built 1978 |
| Lot Size | 0.128 acres (5,566 sqft) |
| Owner | 2 Trust Names on File |
| Tax Bill | $5,965 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 064-124-120 |
| Primary APN | 064-124-120 |
|---|
| Bedrooms | 6 Beds |
|---|---|
| Full Baths | 4 Baths |
| Total Rooms | 12 Rooms |
| Stories | 2 Stories |
| Building Area | 3,630 sqft Living Area |
| Year Built | Built 1978 |
|---|---|
| Effective Year Built | Effective 1978 |
| Architectural Style | Duplex Single |
| Lot Area | 5,566 sqft (0.128 acres) |
| Lot Dimensions | 86 ft deep x 65 ft wide |
| Parking Spaces | 4 Parking Spaces |
| Street Address | 850 FOURTH AVE |
|---|---|
| City | HALF MOON BAY |
| State | CA |
| Zip | 94019-2162 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Local Zoning Code | R20000 |
| Legal Description | PARCEL B PARCEL MAP VOL 31/45 & ADJ PTN OF ALLEY ABAND |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | HALF MOON BAY |
| Census Block Group | 3 |
| Census Block | 3019 |
| Census Tract | 613702 |
850 4th Ave, a duplex, is held in a trust since August 1996.
Source: San Mateo County records, as of July 15, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 895 SECOND AVE, HALF MOON BAY, CA 94019-2046 |
| 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 Transfer Date | Aug 27, 1996 |
| Transfer Doc | 0000107265 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 850 4th Ave was $5,965.
Source: San Mateo County assessment roll, as of July 15, 2026
| Type | Name |
|---|---|
| State | California |
| County | San Mateo County |
| Municipality | Half Moon Bay City |
| Unified School District | Cabrillo Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $263,002 (+2%) Land $9,348 Building $253,654 | |
| 2025 | $5,965.00 | $257,846 Land $9,165 Building $248,681 |
| 2023 | $5,321.00 (+6.04%) | $247,835 Land $8,810 Building $239,025 |
| 2022 | $5,018.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 850 4th Ave in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective September 10, 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 |
| Nearby Flood Policies | 3 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 850 4th Ave is low, with a 0.05% 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 | 0.05% annual chance |
| Exposure | Indirect within 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 | COASTSIDE COUNTY WATER DISTRICT serves 19,033 people · EPA ID CA4110011 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Jul 2023 |
| Lead | 2 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 335 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Cruzio Fixed Wireless | 1,000 / 1,000 |
May also be available: AT&T, Verizon.
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