Sonoma County property record for 640 Mountain Ave, Sonoma, CA 95476
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2.5 ba · 3,304 sqft · built 1985 |
| Lot Size | 2.2 acres (95,832 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $1,920,000 (Oct 2018) |
| Tax Bill | $25,529 (2025) |
| Deeds & Mortgages | Jan 2019 Mortgage Oct 2018 Sale |
| Flood Zone | Zone X (minimal risk) |
| APN | 056-341-033-000 |
| Primary APN | 056-341-033-000 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 7 Rooms |
| Stories | 2 Stories |
| Building Area | 3,304 sqft Living Area |
| Gross Area | 4,240 sqft |
| 1st Floor Area | 2,628 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1985 |
|---|---|
| Effective Year Built | Effective 1995 |
| Architectural Style | Custom Design |
| Construction Type | Wood |
| Lot Area | 95,832 sqft |
| Garage Type | Attached |
| Garage Area | 936 sqft |
| Parking Spaces | 4 Parking Spaces |
| Cooling System | HVAC |
|---|---|
| Heating System | Central |
| Old Parcel Number | 056-341-033 |
|---|---|
| Street Address | 640 MOUNTAIN AVE |
| City | SONOMA |
| State | CA |
| Zip | 95476-8564 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | RR5 |
| Legal Subdivision | AGUA CALIENTE RANCHO |
| Legal Block | 3 |
| Legal Lot Number | 4 |
| Jurisdiction | SONOMA CA |
| Township / Civil Division | SONOMA |
| Census Block Group | 3 |
| Census Block | 3004 |
| Census Tract | 150306 |
640 Mountain Ave is owner-occupied and held in a trust since October 2018.
Source: Sonoma County records, as of September 1, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 640 MOUNTAIN AVE, SONOMA, CA 95476-8564 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust, Family Trust |
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 |
|---|---|
| Jan 17, 2019 | Intrafamily Transfer, Transfer · Conventional Mortgage MORGAN STANLEY PRIVATE BANK NA |
| Oct 31, 2018 | Grant Deed, Transfer FIRST AMERICAN TITLE |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Oct 31, 2018 · Amount on File |
| Deed Sale | Oct 31, 2018 · Amount on File |
| Prior Sale | Nov 14, 2000 · Amount on File |
| Deed Document Number | 201875566 |
| Prior Transfer Date | Aug 4, 1998 |
| Prior Transfer Doc | 0000090686 |
| Record Updated | Oct 29, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | SONOMA CA |
| Recording Date | Jan 17, 2019 |
| Property Address | 640 MOUNTAIN AVE, SONOMA, CA 95476-8564 |
| Document Number | 0000003192 |
| Instrument Date | Dec 31, 2018 |
| Instrument | 2019003192 |
| Transaction Type | Transfer |
| Record Updated | Aug 19, 2021 |
| Title Company | FIRST AMERICAN TITLE INS CO |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|---|
| Address | 00000 |
| Name | Verified Name |
|---|---|
| Relationship | Family Trust |
| Address | 4795 REGENT BLVD 1006 A, MCKINNEY, TX 75069 |
| Document Number | 0000003193 |
|---|---|
| Date | Jan 17, 2019 |
| Instrument | 2019003193 |
| Name | MORGAN STANLEY PRIVATE BANK NA |
|---|---|
| Type | Bank |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 360 Months |
| Due | Jan 1, 2049 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | SONOMA CA |
| Recording Date | Oct 31, 2018 |
| Property Address | 640 MOUNTAIN AVE, SONOMA, CA 95476-8564 |
| Document Number | 0000075566 |
| Instrument Date | Oct 16, 2018 |
| Instrument | 75566 |
| Transaction Type | Transfer |
| Record Updated | Nov 15, 2018 |
| Title Company | FIRST AMERICAN TITLE |
| Amount | Amount on Record |
|---|---|
| Tax | $2,112.00 |
| Amount Accuracy | Full Value |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Community Property |
| Address | 1972 BYWOOD DR OAKLAND CA 946021936, OAKLAND, CA 94602-1936 |
The 2025 property tax bill for 640 Mountain Ave was $25,529.
Source: Sonoma County assessment roll, as of September 1, 2026
| Type | Name |
|---|---|
| State | California |
| County | Sonoma County |
| Unified School District | Sonoma Valley Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $2,269,535 (+2%) Land $1,137,827 Building $1,131,708 | |
| 2025 | $25,529.00 | $2,225,035 Land $1,115,517 Building $1,109,518 |
| 2023 | $24,594.00 (+1.22%) | $2,138,636 Land $1,072,201 Building $1,066,435 |
| 2022 | $24,297.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 640 Mountain 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 |
| Community Rating System | Class 10 (0% premium discount) |
| Nearby Flood Policies | 2 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 640 Mountain Ave is moderate, ranking above 56% 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 56% of the US · lower than 67% 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 | VALLEY OF THE MOON WATER DISTRICT serves 23,140 people · EPA ID CA4910013 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Sep 2022 |
| 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 343 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · DSL · Fixed Wireless in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| Starlink Satellite | 280 / 30 |
| T-Mobile Fixed Wireless | 100 / 20 |
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