Contra Costa County property record for 1740 Argonne Dr, Concord, CA 94518
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 3 ba · 2,218 sqft · built 1970 |
| Lot Size | 0.221 acres (9,636 sqft) |
| Owner | 2 Company Names on Record |
| Last Sale | $1,175,000 (Oct 2026) |
| Tax Bill | $2,232 (2025) |
| Deeds & Mortgages | Oct 2026 Sale & Line of Credit Feb 2023 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 145-090-033-5 |
| Primary APN | 145-090-033-5 |
|---|---|
| Alternative APN |
|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 11 Rooms |
| Stories | 1 Story |
| Building Area | 2,218 sqft Living Area |
| 1st Floor Area | 2,218 sqft |
| Year Built | Built 1970 |
|---|---|
| Effective Year Built | Effective 1971 |
| Lot Area | 9,636 sqft (0.221 acres) |
| Garage Type | Attached |
| Garage Area | 462 sqft |
| Parking Spaces | 2 Parking Spaces |
| Street Address | 1740 ARGONNE DR |
|---|---|
| City | CONCORD |
| State | CA |
| Zip | 94518-3505 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10 |
| Legal Description | PARCEL MAP 9 PG 26 PCL A |
| Legal Subdivision | PM 9 26 |
| Legal Tract | 9PM26 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 1 |
| Census Block | 1005 |
| Census Tract | 338201 |
Source: Contra Costa County records, as of October 21, 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 Record |
|---|---|
| Mailing Address | 1740 ARGONNE DR, CONCORD, CA 94518-3505 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust, Family Trust |
| Date | Document |
|---|---|
| Oct 9, 2026 | Grant Deed, Transfer · Line of Credit CORNERSTONE MORTGAGE INC |
| Feb 9, 2023 | Intrafamily Transfer, Transfer |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Oct 9, 2026 · Amount on Record |
| Deed Sale | Oct 9, 2026 · Amount on Record |
| Deed Document Number | 2026109097 |
| Prior Transfer Date | Feb 19, 2015 |
| Prior Transfer Doc | 0000030247 |
| Record Updated | Oct 29, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Oct 9, 2026 |
| Property Address | 1740 ARGONNE DR, CONCORD, CA 94518-3505 |
| Document Number | 0000109097 |
| Instrument Date | Oct 5, 2026 |
| Instrument | 2026109097 |
| Transaction Type | Transfer |
| Record Updated | Oct 20, 2026 |
| Title Company | CHICAGO TITLE W, CHICAGO TITLE |
| Amount | Amount Recorded |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $130,542.50 |
| Amount Accuracy | Full Amount Stated |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Family Trust |
| Address | 1740 ARGONNE DR, CONCORD, CA 94518-3505 |
| Document Number | 0000109098, |
|---|---|
| Date | Oct 9, 2026 |
| Instrument | 2026109098 |
| Name | CORNERSTONE MORTGAGE INC |
|---|
| Type | Line of Credit |
|---|---|
| Amount | Amount Recorded |
| Term | 360 Months |
| Due | Nov 1, 2056 |
| Max Rate | -1% |
|---|
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Feb 9, 2023 |
| Property Address | 1740 ARGONNE DR, CONCORD, CA 94518-3505 |
| Document Number | 0000011793 |
| Map Reference | MB 9 PG 26 |
| Instrument Date | Feb 7, 2023 |
| Instrument | 2023-011793 |
| Transaction Type | Transfer |
| Record Updated | Jun 7, 2023 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Living Trust |
| Address | 1740 ARGONNE DR, CONCORD, CA 94518-3505 |
Source: Contra Costa County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Concord City |
| Unified School District | Mount Diablo Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $126,073 (+2%) Land $38,476 Building $87,597 | |
| 2025 | $2,232.00 (+6.9%) Homeowner's exemption | $123,602 (+4.04%) Land $37,722 Building $85,880 |
| 2023 | $2,088.00 (+2.76%) Homeowner's exemption | $118,805 Land $36,258 Building $82,547 |
| 2022 | $2,032.00 |
Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.
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 |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 7 (15% premium discount) |
| Nearby Flood Policies | 9 in force |
| Nearby Flood Claims | 1 (1982) |
| Most Recent Claim | Jan 1982 · Severe Storms, Flood, Mudslides & High Tide |
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 | CONTRA COSTA WATER DISTRICT serves 210,500 people · EPA ID CA0710003 |
|---|---|
| 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, 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 406 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Astound Broadband Cable | 1,500 / 50 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
| AT&T Fixed Wireless · DSL | 100 / 20 |
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