Alameda County property record for 901 William Dr, San Lorenzo, CA 94580
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 3 ba · 1,722 sqft · built 2000 |
| Lot Size | 0.071 acres (3,087 sqft) |
| Owner | 2 Individual Names on Record |
| Last Sale | $495,000 (Apr 2003) |
| Tax Bill | $9,428 (2025) |
| Flood Zone | Zone AO (high risk) |
| APN | 412-20-33 |
| Primary APN | 412-20-33 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 8 Rooms |
| Stories | 2 Stories |
| Building Area | 1,722 sqft Living Area |
| Year Built | Built 2000 |
|---|---|
| Effective Year Built | Effective 2000 |
| Architectural Style | L-Shape |
| Construction Type | Wood |
| Lot Area | 3,087 sqft (0.071 acres) |
| Parking Spaces | 2 Parking Spaces |
| Street Address | 901 WILLIAM DR |
|---|---|
| City | SAN LORENZO |
| State | CA |
| Zip | 94580-1556 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT: 00033 BLK: TR: 6987 |
| Legal Tract | 6987 |
| Legal Lot Number | 33 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 4 |
| Census Block | 4006 |
| Census Tract | 435800 |
Source: Alameda County records, as of August 5, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Individual Names on Record |
|---|---|
| Mailing Address | 901 WILLIAM DR, SAN LORENZO, CA 94580-1556 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Apr 18, 2003 · Amount on Record |
| Deed Sale | Apr 18, 2003 · Amount on Record |
| Prior Sale | Feb 10, 2000 · Amount on Record |
| Deed Document Number | 2003226516 |
| Record Updated | Oct 29, 2026 |
Source: Alameda County assessment roll, as of August 5, 2026
| Type | Name |
|---|---|
| State | California |
| County | Alameda County |
| Unified School District | San Lorenzo Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $731,193 (+2%) Land $219,358 Building $511,835 | ||
| 2025 | $9,428.00 (+3.76%) | $716,858 (+4.04%) Land $215,057 Building $501,801 | |
| 2023 | $9,086.00 | $689,030 Land $206,709 Building $482,321 | $977,940 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
Source: FEMA National Flood Hazard Layer, effective May 25, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone AO high risk · sheet flow 1–3 ft |
|---|---|
| 100-Year Floodplain | Yes 1% annual chance |
| Floodway | No |
| Base Flood Elevation | Varies along the reach; see FIRM |
| Flood Insurance Requirement | Required federally backed loans |
| Flood Insurance Cost | Premium on Record median of 68 policies |
| Community Rating System | Class 7 (15% premium discount) |
| Nearby Flood Policies | 68 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.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land 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 | EAST BAY MUD serves 1,468,000 people · EPA ID CA0110005 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Dec 2021 |
| 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. This system sells water to local utilities; the supplier billing this address may be one of them.
Source: FCC Broadband Data Collection, based on 286 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| RobinsonHSS Fixed Wireless | 1,000 / 1,000 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
| Etheric Networks Fixed Wireless | 250 / 100 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T DSL · Fiber, Fixed Wireless in parts of the area | 100 / 20 |
May also be available: GeoLinks, Sonic Telecom, Tekify Fiber & Wireless.
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