Marin County property record for 254 Throckmorton Ave, Mill Valley, CA 94941
| Property Type | Duplex |
|---|---|
| Details | 4 bd · 2.5 ba · 2,632 sqft · built 1908 |
| Lot Size | 0.145 acres (6,302 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $59,000 (Jan 2005) |
| Tax Bill | $19,950 (2025) |
| Deeds & Mortgages | Jan 2021 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 028-055-12 |
| Primary APN | 028-055-12 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Units | 2 Units |
| Building Area | 2,632 sqft Living Area |
| Basement Area | 50 sqft |
| Year Built | Built 1908 |
|---|---|
| Effective Year Built | Effective 1915 |
| Architectural Style | Duplex Single |
| Lot Area | 6,302 sqft (0.145 acres) |
| Garage Area | 180 sqft |
| Deck Area | 230 sqft |
| Patio Area | 230 sqft |
| Heating System | Central |
|---|
| Street Address | 254 THROCKMORTON AVE |
|---|---|
| City | MILL VALLEY |
| State | CA |
| Zip | 94941-2712 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Legal Description | PART OF LOT 17,18 |
| Legal Subdivision | TAMALPAIS LAND & WATER CO |
| Legal Lot Number | 17,18 |
| Jurisdiction | MARIN CA |
| Township / Civil Division | SOUTHEAST MARIN |
| Census Block Group | 2 |
| Census Block | 2000 |
| Census Tract | 127000 |
254 Throckmorton Ave, a duplex, is owned by two individuals who bought it in January 2005.
Source: Marin County records, as of July 13, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 1 BLACKFIELD DR, 189, BELVEDERE TIBURON, CA 94920-2053 |
| Owner Type | Individual |
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 | Jan 18, 2005 · Amount on File |
| Deed Sale | Jan 18, 2005 · Amount on File |
| Prior Sale | Oct 1, 2001 · Amount on File |
| Deed Document Number | 20053620 |
| Prior Transfer Date | Jan 29, 1993 |
| Prior Transfer Doc | 0000024554 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | MARIN CA |
| Property Address | 254 THROCKMORTON AVE, MILL VALLEY, CA 94941-2712 |
| Transaction Type | Mortgage |
| Record Updated | Jul 21, 2022 |
| Title Company | OLD REPUBLIC TITLE |
| Name | Verified Name |
|---|---|
| Address | 1 BLACKTIELD DRIVE #189 189, 189, TIBURON, CA 94920-2053 |
| Document Number | 0000000381 |
|---|---|
| Date | Jan 4, 2021 |
| Instrument | 2021-0000381 |
| Name | PRIMARY RESIDENTIAL MORTGAGE INC |
|---|---|
| Type | Mortgage Company |
| Address | SALT LAKE CITY, UT 84116 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 360 Months |
| Due | Jan 1, 2051 |
The 2025 property tax bill for 254 Throckmorton Ave was $19,950.
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 | $1,322,134 (+2%) Land $852,990 Building $469,144 | |
| 2025 | $19,950.00 | $1,296,215 Land $836,268 Building $459,947 |
| 2023 | $19,062.00 (+4.24%) | $1,245,893 Land $803,802 Building $442,091 |
| 2022 | $18,287.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 254 Throckmorton 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 254 Throckmorton 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 595 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · Fixed Wireless in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
May also be available: T-Mobile, Unwired.
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