Sonoma County property record for 405 W Sierra Ave, Cotati, CA 94931
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 3 ba · 2,102 sqft · built 1951 |
| Lot Size | 0.393 acres (17,136 sqft) |
| Owner | Trust Name on File |
| Last Sale | $650,000 (Feb 2021) |
| Tax Bill | $8,488 (2025) |
| Deeds & Mortgages | Feb 2021 Sale & Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 144-340-023-000 |
| Primary APN | 144-340-023-000 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 4 Rooms |
| Stories | 1 Story |
| Building Area | 2,102 sqft Living Area |
| 1st Floor Area | 2,102 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1951 |
|---|---|
| Effective Year Built | Effective 1985 |
| Architectural Style | Custom Design |
| Exterior Material | Wood Siding |
| Construction Type | Wood |
| Lot Area | 17,136 sqft (0.393 acres) |
| Garage Type | Carport |
| Garage Area | 100 sqft |
| Carport | Carport |
| Carport Area | 100 sqft |
| Porch | Porch |
| Cooling System | HVAC |
|---|---|
| Sewer | Municipal |
| Water Source | Commercial |
| Old Parcel Number | 144-340-023 |
|---|---|
| Street Address | 405 W SIERRA AVE |
| City | COTATI |
| State | CA |
| Zip | 94931-4287 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | CITYCO |
| Legal Description | 73 FORM 23 PT TO 24 MD & PT TO ST BY OR 2744-084 |
| Legal Subdivision | PARCEL MAP NO 18 |
| Legal Block | 3 |
| Jurisdiction | SONOMA CA |
| Township / Civil Division | PETALUMA |
| Census Block Group | 3 |
| Census Block | 3000 |
| Census Tract | 151204 |
405 W Sierra Ave is held in a trust since February 2021.
Source: Sonoma County records, as of September 1, 2026
| Owner of Record | Trust Name on File |
|---|---|
| Mailing Address | 405 W SIERRA AVE, COTATI, CA 94931-4287 |
| 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 | Feb 25, 2021 · Amount on File |
| Deed Sale | Feb 25, 2021 · Amount on File |
| Prior Sale | May 25, 2007 · Amount on File |
| Deed Document Number | 202122827 |
| Prior Transfer Date | Jun 29, 1998 |
| Prior Transfer Doc | 0000082899 |
| Record Updated | Oct 29, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | SONOMA CA |
| Recording Date | Feb 25, 2021 |
| Property Address | 405 W SIERRA AVE, COTATI, CA 94931-4287 |
| Document Number | 0000022827 |
| Map Reference | MB 187 PG 39 |
| Instrument Date | Feb 5, 2021 |
| Instrument | 2021022827 |
| Transaction Type | Transfer |
| Record Updated | Jun 7, 2023 |
| Title Company | CORNERSTONE TITLE COMPANY |
| Amount | Amount on Record |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $715.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Living Trust |
| Address | 405 W SIERRA AVE, COTATI, CA 94931-4287 |
| Investor | Possibly a Property Investor |
| Document Number | 0000022828 |
|---|---|
| Date | Feb 25, 2021 |
| Instrument | 2021022828 |
| Name | AMERICAN PACIFIC MORTGAGE CORP |
|---|---|
| Type | Mortgage Company |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Mar 1, 2051 |
| Document Number | 0000022829 |
|---|---|
| Date | Feb 25, 2021 |
| Instrument | 2021022829 |
| Name | ALASKA USA FCU |
|---|---|
| Type | Credit Union |
| Address | ANCHORAGE, AK 99519 |
| Type | Line of Credit |
|---|---|
| Amount | Amount on Record |
| Term | 360 Months |
| Due | Feb 24, 2051 |
The 2025 property tax bill for 405 W Sierra Ave was $8,488.
Source: Sonoma County assessment roll, as of September 1, 2026
| Type | Name |
|---|---|
| State | California |
| County | Sonoma County |
| Municipality | Cotati City |
| Unified School District | Cotati-Rohnert Park Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $717,651 (+2%) Land $276,020 Building $441,631 | |
| 2025 | $8,488.00 | $703,580 Land $270,608 Building $432,972 |
| 2023 | $8,244.00 (+1.77%) | $676,260 Land $260,100 Building $416,160 |
| 2022 | $8,101.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 405 W Sierra Ave 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 February 15, 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Nearest Special Flood Hazard Area | Zone AE, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
Wildfire risk around 405 W Sierra Ave is low, with less than 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 99.1% of the US · lower than 99.2% of California |
|---|---|
| Wildfire Likelihood | Under 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 | CITY OF COTATI serves 7,290 people · EPA ID CA4910016 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Aug 2024 |
| Lead | Under 1 ppb (2024–2026) 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 321 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T DSL | 100 / 20 |
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