Contra Costa County property record for 524 Main St, Martinez, CA 94553 · Last verified July 2026
| Property Type | Commercial > Office > Commercial Office |
|---|---|
| Year Built | Built 1960 |
| Square Footage | 10,904 sqft Gross Area |
| Lot Size | 13,750 sqft (0.316 acres) |
| Last Sale | $1,500,000 (2023) |
| Tax Bill | $20,449.00 (2025) |
| Primary APN | 373-226-010-8 |
|---|---|
| Alternative APN |
|
| Building Area | 10,904 sqft Gross Area |
|---|---|
| 1st Floor | 10,904 sqft 1st Floor |
| Stories | 1 Stories |
| Year Built | Built 1924 |
|---|---|
| Effective Year Built | Effective 1960 |
| Lot Area | 13,750 sqft (0.316 acres) |
| Street Address | 524 MAIN ST |
|---|---|
| City | MARTINEZ |
| State | CA |
| Zip | 94553-1140 |
| Property Usage | Commercial Property Usage |
| Type | Commercial > Office > Commercial Office |
| Legal Description | ORIG SURVEY MTZ LOT 2 & POR 5 6 & 7 |
| Legal Subdivision | MARTINEZ |
| Legal Block | 21 |
| Legal Lot Number | 2 |
| Jurisdiction | CONTRA COSTA CA |
| Minor Civil Division | CENTRAL CONTRA COSTA |
| Census Blockgroup | 1 |
| Census Block | 1039 |
| Census Tract | 316000 |
Source: Contra Costa County records · APN 373-226-010-8
Assessment roll updated July 14, 2026 · Last verified July 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | 4169 ARTHUR RD, MARTINEZ, CA 94553-1403 |
| Owner Type | Owner is a Company |
| Date | Document |
|---|---|
| May 31, 2023 | Grant Deed, Transfer · Commercial Mortgage THE ROBERT L LAFLEUR TRUST |
| Apr 27, 2023 | Deed of Trust, Mortgage · Commercial Mortgage JOSE E GUERRERO JR TRUST |
| Deed Names | Verified Name on Deed |
|---|---|
| Last Sale | May 31, 2023 · Amount on Record |
| Deed Sale | May 31, 2023 · Amount on Record |
| Deed Doc Number | 202351708 |
| Prior Transfer Date | Aug 19, 1998 |
| Prior Transfer Doc | 0000258392 |
| Record Refreshed | Sep 20, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | May 31, 2023 |
| Property Address | 524 MAIN ST, MARTINEZ, CA 94553-1140 |
| Document Number | 0000051708 |
| Instrument Date | May 26, 2023 |
| Instrument | 2023-051708 |
| Transaction Type | Transfer |
| Record Updated | Jun 09, 2023 |
| Title Company | OLD REPUBLIC TITLE, OLD REPUBLIC TITLE COMPANY |
| Amount | Amount Recorded |
|---|---|
| Downpayment | Downpayment on File |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $0.00 |
| Amount Accuracy | Rounded Values by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 4169 ARTHUR RD, MARTINEZ, CA 94553-1403 |
| Document Number | 0000051709 |
|---|---|
| Date | May 31, 2023 |
| Instrument | 2023-051709 |
| Name | THE ROBERT L LAFLEUR TRUST |
|---|---|
| Type | Private Party |
| Type | Commercial Mortgage |
|---|---|
| Amount | Amount Recorded |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Property Address | 524 MAIN ST, MARTINEZ, CA 94553-1140 |
| Transaction Type | Mortgage |
| Record Updated | May 08, 2023 |
| Title Company | FIDELITY NATIONAL TITLE |
| Name | Verified Name |
|---|---|
| Address | 777 SHELL AVE, MARTINEZ, CA 94553-3229 |
| Document Number | 0000039003 |
|---|---|
| Date | Apr 27, 2023 |
| Instrument | 2023-039003 |
| Name | JOSE E GUERRERO JR TRUST |
|---|---|
| Type | Private Party |
| Address | 1160 BASSWOOD PL, CONCORD, CA 94521 |
| Type | Commercial Mortgage |
|---|---|
| Amount | Amount Recorded |
Source: Contra Costa County records · Assessment roll updated July 14, 2026 · Last verified July 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Martinez City |
| Unified School District | Martinez Unified School District (KG - 12) |
Assessed value is set for property tax purposes and is not a market price estimate.
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $1,591,812 (+2%) Land $530,604 Building $1,061,208 | |
| 2025 | $20,449.00 (-10.52%) | $1,560,600 (-16.51%) Land $520,200 Building $1,040,400 |
| 2023 | $22,852.00 (+1.52%) | $1,869,169 Land $610,081 Building $1,259,088 |
| 2022 | $22,510.00 |
524 Main St is in FEMA Zone AO, inside the Special Flood Hazard Area, with indirect wildfire exposure (Moderate risk).
Source: FEMA National Flood Hazard Layer · Contra Costa County (06013C), updated October 12, 2026
| FEMA Flood Zone | Zone AO 1% annual chance, sheet flow 1–3 ft |
|---|---|
| Special Flood Hazard Area | Yes flood insurance required for federally backed mortgages |
| Floodway | No |
| Base Flood Elevation | Varies along the reach; see FIRM |
Source: USDA Forest Service Wildfire Risk to Communities · 2nd edition (2024), fuels as of 2020
| Wildfire Risk to Homes | Moderate 46th percentile of exposed land nationally · 27th in California |
|---|---|
| Wildfire Likelihood | Moderate — about 1 in 1,282 per year |
| Exposure | Indirect within ember reach of burnable land |
Values are read at the parcel center point; lenders make the official flood determination.
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