Marin County property record for 421 Wellesley Ave, Mill Valley, CA 94941
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 4.5 ba · 3,722 sqft · built 2006 |
| Lot Size | 0.62 acres (27,000 sqft) |
| Owner | 2 Company Names on File |
| Last Sale | $3,950,000 (Feb 2007) |
| Tax Bill | $57,064 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 050-081-29 |
| Primary APN | 050-081-29 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 4.5 Baths |
| Half Baths | 1 Half Bath |
| Building Area | 3,722 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 2006 |
|---|---|
| Effective Year Built | Effective 2006 |
| Architectural Style | Contemporary |
| Lot Area | 27,000 sqft (0.62 acres) |
| Garage Area | 837 sqft |
| Parking Spaces | 3 Parking Spaces |
| Deck Area | 400 sqft |
| Patio Area | 400 sqft |
| Heating System | Radiant |
|---|
| Street Address | 421 WELLESLEY AVE |
|---|---|
| City | MILL VALLEY |
| State | CA |
| Zip | 94941-3713 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Jurisdiction | MARIN CA |
| Township / Civil Division | SOUTHEAST MARIN |
| Census Block Group | 1 |
| Census Block | 1000 |
| Census Tract | 128100 |
Source: Marin County records · APN 050-081-29
Assessment roll updated July 13, 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 | 421 WELLESLEY AVE, MILL VALLEY, CA 94941-3713 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Feb 15, 2007 · Amount on Record |
| Deed Sale | Feb 15, 2007 · Amount on Record |
| Deed Document Number | 20079193 |
| Last Transfer Date | Nov 12, 2007 |
| Transfer Doc | 0000065833 |
| Record Updated | Sep 20, 2026 |
Source: Marin County records · Assessment roll updated July 13, 2026 · Last verified July 2026
| Type | Name |
|---|---|
| State | California |
| County | Marin County |
| Elementary School District | Mill Valley Elementary School District (KG - 08) |
| Secondary School District | Tamalpais Union High School District (09 - 12) |
Assessed value is set for property tax purposes and is not a market price estimate.
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $4,400,000 (-) Land $2,138,500 Building $2,261,500 | |
| 2025 | $57,064.00 (+2.27%) Homeowner's exemption | $4,400,000 (+2.33%) Land $2,138,500 Building $2,261,500 |
| 2023 | $55,797.00 (-12.86%) Homeowner's exemption | $4,300,000 Land $2,090,000 Building $2,210,000 |
| 2022 | $64,028.00 |
Source: FEMA National Flood Hazard Layer, Marin County (06041C), as of October 18, 2023 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 060411281001, as of September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition, as of 2020 · 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 | 4 (1982–1998) |
| Claims Outside the SFHA | 4 of 4 |
| Most Recent Claim | Apr 1998 · Severe Winter Storms And Flooding |
| Wildfire Risk | Low lower than 80% of the US · lower than 88% of California |
|---|---|
| Wildfire Likelihood | 0.02% annual chance |
| Exposure | Direct burnable vegetation at the parcel |
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) |
|---|---|
| AT&T Fiber · DSL in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
May also be available: T-Mobile USA, Unwired, Verizon.
Based on FCC filings for 496 locations within half a mile of this property.
5G and 4G LTE (outdoors only)
Source: EPA Safe Drinking Water Information System, water system CA2110002, as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026
| Water System | MARIN MUNICIPAL WATER DISTRICT serves 188,116 people |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Aug 2023 |
| Lead | Under 1 ppb (2019–2021) 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. This system sells water to local utilities; the supplier billing this address may be one of them. The full violation and enforcement history is in the system's EPA record.
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