Marin County property record for 20 Florence Ave, Mill Valley, CA 94941
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2.5 ba · 2,370 sqft · built 1954 |
| Lot Size | 0.238 acres (10,375 sqft) |
| Owner | 2 Trust Names on File |
| Tax Bill | $5,355 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 028-151-05 |
| Primary APN | 028-151-05 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Building Area | 2,370 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1954 |
|---|---|
| Effective Year Built | Effective 1969 |
| Architectural Style | Contemporary |
| Lot Area | 10,375 sqft (0.238 acres) |
| Heating System | Central |
|---|
| Street Address | 20 FLORENCE AVE |
|---|---|
| City | MILL VALLEY |
| State | CA |
| Zip | 94941-2612 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Subdivision | TAMALPAIS LAND & WATER CO |
| Legal Lot Number | 238 |
| Jurisdiction | MARIN CA |
| Township / Civil Division | SOUTHEAST MARIN |
| Census Block Group | 2 |
| Census Block | 2004 |
| Census Tract | 127000 |
20 Florence Ave is owner-occupied and held in a trust since August 2011.
Source: Marin County records, as of July 13, 2026
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 20 FLORENCE AVE, MILL VALLEY, CA 94941-2612 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust, Living Trust |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Transfer Date | Aug 1, 2011 |
| Transfer Doc | 0000038857 |
| Record Updated | Sep 20, 2026 |
The 2025 property tax bill for 20 Florence Ave was $5,355 with a homeowner's exemption.
Source: Marin County assessment roll, as of July 13, 2026
| Type | Name |
|---|---|
| State | California |
| County | Marin County |
| Municipality | Mill Valley City |
| Elementary School District | Mill Valley Elementary School District (KG - 08) |
| Secondary School District | Tamalpais Union High School District (09 - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $154,680 (+2%) Land $43,749 Building $110,931 | |
| 2025 | $5,355.00 Homeowner's exemption | $151,647 Land $42,891 Building $108,756 |
| 2023 | $5,130.00 (+6.83%) Homeowner's exemption | $145,759 Land $41,226 Building $104,533 |
| 2022 | $4,802.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 20 Florence 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 October 18, 2023 · OpenFEMA NFIP redacted claims and policies, as of September 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 |
| Nearby Flood Policies | 1 in force |
| Nearby Flood Claims | 3 (1982–1983) |
| Claims Outside the SFHA | 3 of 3 |
| Most Recent Claim | Feb 1983 · Coastal Storms, Floods, Slides & Tornadoes |
| Claims by Event |
|
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 20 Florence Ave is low, with a 0.02% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 80% of the US · lower than 88% of California |
|---|---|
| Wildfire Likelihood | 0.02% annual chance |
| Exposure | Indirect within ember reach |
| Adjoins Burnable Land | Yes |
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 | MARIN MUNICIPAL WATER DISTRICT serves 188,116 people · EPA ID CA2110002 |
|---|---|
| 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, 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.
Source: FCC Broadband Data Collection, based on 351 locations within half a mile, as of December 31, 2025
| 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, Unwired, Verizon.
5G (outdoors only) and 4G LTE
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