Contra Costa County property record for 4500 Blum Rd, Martinez, CA 94553
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,993 sqft · built 1957 |
| Lot Size | 2 acres (87,120 sqft) |
| Owner | 2 Company Names on File |
| Last Sale | $850,000 (Mar 2018) |
| Tax Bill | $12,366 (2025) |
| Deeds & Mortgages | Mar 2018 Sale May 2017 Line of Credit |
| Flood Zone | Zone X (minimal risk) |
| APN | 159-170-028-9 |
| Primary APN | 159-170-028-9 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,993 sqft Living Area |
| 1st Floor Area | 1,993 sqft |
| Year Built | Built 1957 |
|---|---|
| Effective Year Built | Effective 1957 |
| Lot Area | 87,120 sqft |
| Garage Type | Attached |
| Garage Area | 615 sqft |
| Parking Spaces | 2 Parking Spaces |
| Heating System | Central |
|---|
| Street Address | 4500 BLUM RD |
|---|---|
| City | MARTINEZ |
| State | CA |
| Zip | 94553-3600 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R7 |
| Legal Description | PCL MAP 102 PG 15 PCL A |
| Legal Subdivision | SUBDIVISION 8738 |
| Legal Tract | 102PM15 |
| Legal Lot Number | 2 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 1 |
| Census Block | 1003 |
| Census Tract | 320004 |
Source: Contra Costa County records · APN 159-170-028-9
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 | 2 Company Names on File |
|---|---|
| Mailing Address | 1435 MONTROSE DR, SAN LEANDRO, CA 94577-6353 |
| Owner Type | Company |
| Vesting | Tenants in Common |
| Date | Document |
|---|---|
| Mar 13, 2018 | Grant Deed, Transfer NORTH AMERICAN TITLE |
| May 05, 2017 | Deed of Trust, Mortgage · Line of Credit BANK OF AMERICA |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Mar 13, 2018 · Amount on Record |
| Deed Sale | Mar 13, 2018 · Amount on Record |
| Deed Document Number | 201838648 |
| Prior Transfer Date | Oct 31, 2007 |
| Prior Transfer Doc | 0000316727 |
| Record Updated | Sep 20, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Mar 13, 2018 |
| Property Address | 4500 BLUM RD, MARTINEZ, CA 94553-3600 |
| Document Number | 0000038648 |
| Instrument Date | Mar 09, 2018 |
| Instrument | 38648 |
| Transaction Type | Transfer |
| Record Updated | Mar 20, 2018 |
| Title Company | NORTH AMERICAN TITLE |
| Amount | Amount Recorded |
|---|---|
| Tax | $935.00 |
| Amount Accuracy | Full Value |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Company |
| Address | 1435 MONTROSE DR SAN LEANDRO CA 945776353, SAN LEANDRO, CA 94577-6353 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Property Address | 4500 BLUM RD, MARTINEZ, CA 94553-3600 |
| Document Number | 0000100523 |
| Instrument Date | May 05, 2017 |
| Transaction Type | Mortgage |
| Record Updated | Jun 23, 2017 |
| Title Company | OTHER |
| Name | Verified Name |
|---|---|
| Address | 4500 BLUM RD MARTINEZ CA 945533600, MARTINEZ, CA 94553-3600 |
| Document Number | 0000100523 |
|---|---|
| Date | Jun 06, 2017 |
| Instrument | 100523 |
| Name | BANK OF AMERICA |
|---|---|
| Type | Bank |
| Address | TAMPA, FL 33634 |
| Type | Line of Credit |
|---|---|
| Amount | Amount Recorded |
| Rate Type | Adjustable Rate |
|---|
Source: Contra Costa County records · Assessment roll updated July 14, 2026 · Last verified July 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| 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 | $986,491 (+2%) Land $974,888 Building $11,603 | |
| 2025 | $12,366.00 (+6.88%) | $967,149 (+4.04%) Land $955,773 Building $11,376 |
| 2023 | $11,570.00 (+2.31%) | $929,595 Land $918,660 Building $10,935 |
| 2022 | $11,309.00 |
Source: FEMA National Flood Hazard Layer as of October 12, 2026 · FEMA NFIP claims and policies as of September 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 6 (20% premium discount) |
| Nearby Flood Policies | 4 in force |
| Nearby Flood Claims | 1 (2017) |
| Claims Outside the SFHA | 1 of 1 |
| Most Recent Claim | Jan 2017 · Severe Winter Storms, Flooding, And Mudslides |
| Wildfire Risk | Low lower than 99.1% of the US · lower than 99.2% of California |
|---|---|
| Wildfire Likelihood | Under 0.01% annual chance |
| Exposure | None beyond ember reach |
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: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Radiate Holdings Fiber · Cable in parts of the area | 1,500 / 1,500 |
| Unwired Fixed Wireless | 300 / 25 |
| T-Mobile USA Fixed Wireless | 100 / 20 |
May also be available: AT&T, Verizon.
Based on FCC filings for 244 locations within half a mile of this property.
5G (outdoors only) and 4G LTE
Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026
| Water System | CONTRA COSTA WATER DISTRICT serves 210,500 people |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Jan 2022 |
| Lead | Under 1 ppb (2026–2028) 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 as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.
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