Contra Costa County property record for 342 Diablo Rd, Danville, CA 94526
| Property Type | Commercial Office |
|---|---|
| Details | 6,372 sqft · built 1987 |
| Lot Size | 0.453 acres (19,724 sqft) |
| Owner | Trust Name on File |
| Last Sale | $1,900,000 (Sep 1998) |
| Tax Bill | $34,304 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 196-210-052-3 |
| Primary APN | 196-210-052-3 |
|---|---|
| Alternative APN |
|
| Total Rooms | 3 Rooms |
|---|---|
| Stories | 1 Story |
| Building Area | 6,372 sqft Gross Area |
| 1st Floor Area | 6,372 sqft |
| Year Built | Built 1987 |
|---|---|
| Effective Year Built | Effective 1987 |
| Lot Area | 19,724 sqft (0.453 acres) |
| Street Address | 342 DIABLO RD, 360 |
|---|---|
| City | DANVILLE |
| State | CA |
| Zip | 94526 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Commercial Office |
| Legal Description | POR RO SAN RAMON |
| Legal Subdivision | SAN RAMON RHO |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 3 |
| Census Block | 3002 |
| Census Tract | 345203 |
342 Diablo Rd is held in a trust since December 2012.
Source: Contra Costa County records, as of July 14, 2026
| Owner of Record | Trust Name on File |
|---|---|
| Mailing Address | 285 SAINT JAMES DR, PIEDMONT, CA 94611-3622 |
| 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 | Name on Deed |
|---|---|
| Last Sale | Sep 23, 1998 · Amount on File |
| Deed Sale | Sep 23, 1998 · Amount on File |
| Deed Document Number | 1998230964 |
| Last Transfer Date | Dec 20, 2012 |
| Transfer Doc | 0000326773 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 342 Diablo Rd was $34,304.
Source: Contra Costa County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Danville Town |
| Unified School District | San Ramon Valley Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $3,038,236 (+2%) Land $959,437 Building $2,078,799 | |
| 2025 | $34,304.00 | $2,978,664 Land $940,625 Building $2,038,039 |
| 2023 | $33,052.00 (+1.23%) | $2,863,000 (+2%) Land $904,100 Building $1,958,900 |
| 2022 | $32,650.00 | $2,806,864 Land $886,373 Building $1,920,491 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 342 Diablo Rd in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.
Source: FEMA National Flood Hazard Layer, effective October 12, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Nearest Special Flood Hazard Area | Zone A, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 5 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 342 Diablo Rd 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 | 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 398 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 2,000 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
| AT&T Fixed Wireless · DSL · Fiber in parts of the area | 100 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
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