Sonoma County property record for 605 W Sierra Ave, Cotati, CA 94931
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 1 ba · 1,460 sqft · built 1935 |
| Lot Size | 3.45 acres (150,282 sqft) |
| Owner | Company Name on File |
| Last Sale | $1,150,000 (Mar 2020) |
| Tax Bill | $13,634 (2025) |
| Deeds & Mortgages | Apr 2020 Mortgage Mar 2020 Line of Credit + 1 more |
| Flood Zone | Zone X (minimal risk) |
| APN | 144-330-003-000 |
| Primary APN | 144-330-003-000 |
|---|---|
| Alternative APN |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 4 Rooms |
| Stories | 1 Story |
| Building Area | 1,460 sqft Living Area |
| Gross Area | 2,060 sqft |
| 1st Floor Area | 1,460 sqft |
| Year Built | Built 1935 |
|---|---|
| Effective Year Built | Effective 1980 |
| Construction Type | Wood |
| Fire Resistance | Wood or Wood & Steel Frame |
| Lot Area | 150,282 sqft |
| Garage Type | Attached |
| Garage Area | 600 sqft |
| Parking Spaces | 2 Parking Spaces |
| Porch | Porch |
| Cooling System | HVAC |
|---|
| Old Parcel Number | 144-330-003 |
|---|---|
| Street Address | 605 W SIERRA AVE |
| City | COTATI |
| State | CA |
| Zip | 94931-4279 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | CITYCO |
| Legal Subdivision | COTATI RHO 04 |
| Legal Block | 2 |
| Legal Lot Number | 70,71 |
| Jurisdiction | SONOMA CA |
| Township / Civil Division | PETALUMA |
| Census Block Group | 2 |
| Census Block | 2010 |
| Census Tract | 151206 |
605 W Sierra Ave is owned by a company that bought it in March 2020.
Source: Sonoma County records, as of September 1, 2026
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | PO BOX 7525, COTATI, CA 94931-7525 |
| Owner Type | Company |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Apr 6, 2020 | Deed of Trust, Mortgage BOSTON PRIVATE BK |
| Mar 20, 2020 | Deed of Trust, Mortgage · Line of Credit BOSTON PRIVATE BK |
| Mar 12, 2020 | Grant Deed, Transfer · Commercial Mortgage BOSTON PRIVATE BANK & TRUST COMPANY |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Mar 12, 2020 · Amount on File |
| Deed Sale | Mar 12, 2020 · Amount on File |
| Prior Sale | Dec 21, 2000 · Amount on File |
| Deed Document Number | 202019094 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SONOMA CA |
| Property Address | 605 W SIERRA AVE, COTATI, CA 94931-4279 |
| Document Number | 0000027779 |
| Instrument Date | Apr 6, 2020 |
| Transaction Type | Mortgage |
| Record Updated | May 7, 2020 |
| Title Company | FIRST AMERICAN TITLE |
| Additional |
|
|---|
| Name | Verified Name |
|---|---|
| Relationship | Company |
| Address | 640 W SCHOOL ST COTATI CA 949314164, COTATI, CA 94931-4164 |
| Document Number | 0000027779 |
|---|---|
| Date | Apr 14, 2020 |
| Instrument | 27779 |
| Name | BOSTON PRIVATE BK |
|---|---|
| Type | Bank |
| Address | SAN FRANCISCO, CA 94111 |
| Amount | Amount on Record |
|---|
| Rate Type | Adjustable Rate |
|---|
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SONOMA CA |
| Property Address | 605 W SIERRA AVE, COTATI, CA 94931-4279 |
| Document Number | 0000027781 |
| Instrument Date | Mar 20, 2020 |
| Transaction Type | Mortgage |
| Record Updated | May 7, 2020 |
| Title Company | NOT AVAILABLE |
| Additional |
|
|---|
| Name | Verified Name |
|---|---|
| Relationship | Company |
| Address | 605 W SIERRA AVE COTATI CA 949314279, COTATI, CA 94931-4279 |
| Document Number | 0000027781 |
|---|---|
| Date | Apr 14, 2020 |
| Instrument | 27781 |
| Name | BOSTON PRIVATE BK |
|---|---|
| Type | Bank |
| Address | SAN FRANCISCO, CA 94111-5610 |
| Type | Line of Credit |
|---|---|
| Amount | Amount on Record |
| Term | 120 Months |
| Due | Apr 13, 2030 |
| Rate Type | Adjustable Rate |
|---|
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | SONOMA CA |
| Recording Date | Mar 12, 2020 |
| Property Address | 605 W SIERRA AVE, COTATI, CA 94931-4279 |
| Document Number | 0000019094 |
| Map Reference | MB 10 PG 3 |
| Instrument Date | Mar 6, 2020 |
| Instrument | 2020019094 |
| Transaction Type | Transfer |
| Record Updated | Jul 25, 2022 |
| Title Company | FIRST AMERICAN TITLE COMPANY |
| Amount | Amount on Record |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $1,265.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | PO BOX 7525, COTATI, CA 94931-7525 |
| Document Number | 0000019095 |
|---|---|
| Date | Mar 12, 2020 |
| Instrument | 2020019095 |
| Name | BOSTON PRIVATE BANK & TRUST COMPANY |
|---|---|
| Type | Bank |
| Type | Commercial Mortgage |
|---|---|
| Amount | Amount on Record |
The 2025 property tax bill for 605 W Sierra Ave was $13,634.
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 | $1,176,867 (+2%) Land $780,861 Building $396,006 | |
| 2025 | $13,634.00 | $1,153,792 Land $765,550 Building $388,242 |
| 2023 | $13,248.00 (+1.76%) | $1,108,991 Land $735,824 Building $373,167 |
| 2022 | $13,019.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 605 W Sierra Ave in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective February 15, 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 |
| Nearby Flood Policies | 1 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 605 W Sierra Ave is moderate, ranking above 44% of the US, with a 0.1% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Moderate above 44% of the US · lower than 74% of California |
|---|---|
| Wildfire Likelihood | 0.1% annual chance |
| Exposure | Direct burnable vegetation |
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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