Marin County property record for 11 Altamont Ave, Mill Valley, CA 94941
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 2.5 ba · 2,365 sqft · built 1943 |
| Lot Size | 0.144 acres (6,250 sqft) |
| Owner | 2 Company Names on File |
| Last Sale | $1,800,000 (Apr 2011) |
| Tax Bill | $31,180 (2025) |
| Deeds & Mortgages | Jan 2024 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 030-021-10 |
| Primary APN | 030-021-10 |
|---|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Building Area | 2,365 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1943 |
|---|---|
| Effective Year Built | Effective 2000 |
| Architectural Style | Contemporary |
| Lot Area | 6,250 sqft (0.144 acres) |
| Deck Area | 207 sqft |
| Patio Area | 826 sqft |
| Heating System | Floor/Wall Furnace |
|---|
| Street Address | 11 ALTAMONT AVE |
|---|---|
| City | MILL VALLEY |
| State | CA |
| Zip | 94941-1317 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Jurisdiction | MARIN CA |
| Township / Civil Division | SOUTHEAST MARIN |
| Census Block Group | 1 |
| Census Block | 1003 |
| Census Tract | 126100 |
11 Altamont Ave is owned by a company that acquired it in January 2024.
Source: Marin County records, as of July 13, 2026
| Owner of Record | 2 Company Names on File |
|---|---|
| Mailing Address | 11 ALTAMONT AVE, MILL VALLEY, CA 94941-1317 |
| Owner Type | Company |
| Vesting | Borrower in Default |
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 | 2 Names on Deed |
|---|---|
| Last Sale | Apr 29, 2011 · Amount on File |
| Deed Sale | Apr 29, 2011 · Amount on File |
| Prior Sale | Jul 13, 2010 · Amount on File |
| Deed Document Number | 201122705 |
| Last Transfer Date | Jan 24, 2024 |
| Transfer Doc | 0000002986 |
| Record Updated | Sep 20, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | MARIN CA |
| Recording Date | Jan 31, 2024 |
| Property Address | 11 ALTAMONT AVE, MILL VALLEY, CA 94941-1317 |
| Document Number | 0000002986 |
| Instrument Date | Jan 24, 2024 |
| Instrument | 2024-0002986 |
| Transaction Type | Transfer |
| Record Updated | Feb 13, 2024 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 11 ALTAMONT AVE, MILL VALLEY, CA 94941-1317 |
The 2025 property tax bill for 11 Altamont Ave was $31,180.
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 | $2,423,602 (+2%) Land $1,174,741 Building $1,248,861 | |
| 2025 | $31,180.00 | $2,376,084 Land $1,151,708 Building $1,224,376 |
| 2023 | $30,391.00 (+7.48%) | $2,283,849 Land $1,107,001 Building $1,176,848 |
| 2022 | $28,277.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 11 Altamont Ave in Zone X, an area of minimal flood risk, though there have been 9 flood claims nearby since 1982.
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 |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on File median of 10 policies |
| Nearby Flood Policies | 10 in force |
| Nearby Flood Claims | 9 (1982–1998) |
| Claims Outside the SFHA | 8 of 9 |
| Most Recent Claim | May 1998 · other causes |
| 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 11 Altamont Ave is low, with 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 80% of the US · lower than 88% of California |
|---|---|
| Wildfire Likelihood | 0.01% annual chance |
| Exposure | Indirect within 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 | 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 327 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
May also be available: Etheric Networks, T-Mobile.
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