Marin County property record for 440 William Ave, Larkspur, CA 94939
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 3 ba · 1,535 sqft · built 1941 |
| Lot Size | 0.133 acres (5,775 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $1,240,000 (Sep 2013) |
| Tax Bill | $26,792 (2025) |
| Deeds & Mortgages | Jan 2021 Mortgage |
| Flood Zone | Zone AE (high risk) |
| APN | 021-212-16 |
| Primary APN | 021-212-16 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 3 Baths |
| Building Area | 1,535 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1941 |
|---|---|
| Effective Year Built | Effective 1975 |
| Architectural Style | Contemporary |
| Lot Area | 5,775 sqft (0.133 acres) |
| Garage Area | 264 sqft |
| Deck Area | 287 sqft |
| Patio Area | 287 sqft |
| Heating System | Central |
|---|
| Street Address | 440 WILLIAM AVE |
|---|---|
| City | LARKSPUR |
| State | CA |
| Zip | 94939-1530 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 89 |
| Legal Subdivision | HEATHER GARDENS 02 |
| Legal Lot Number | 89 |
| Jurisdiction | MARIN CA |
| Township / Civil Division | ROSS VALLEY |
| Census Block Group | 1 |
| Census Block | 1005 |
| Census Tract | 120002 |
440 William Ave is owned and occupied by two individuals who acquired it in February 2017.
Source: Marin County records, as of July 13, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 440 WILLIAM AVE, LARKSPUR, CA 94939-1530 |
| Occupancy | Owner Occupied |
| 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 | Sep 4, 2013 · Amount on File |
| Deed Sale | Sep 4, 2013 · Amount on File |
| Prior Sale | Jul 8, 1994 · Amount on File |
| Deed Document Number | 201358140 |
| Last Transfer Date | Feb 16, 2017 |
| Transfer Doc | 0000007302 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | MARIN CA |
| Property Address | 440 WILLIAM AVE, LARKSPUR, CA 94939-1530 |
| Transaction Type | Mortgage |
| Record Updated | Feb 9, 2021 |
| Name | Verified Name |
|---|---|
| Address | 440 WILLIAM AVE, LARKSPUR, CA 94939-1530 |
| Document Number | 0000006102 |
|---|---|
| Date | Jan 28, 2021 |
| Instrument | 2021-0006102 |
| Name | PREMIER LENDING INC |
|---|---|
| Type | Mortgage Company |
| Address | CHARLOTTE, NC 28277 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Feb 1, 2051 |
The 2025 property tax bill for 440 William Ave was $26,792 with a homeowner's exemption.
Source: Marin County assessment roll, as of July 13, 2026
| Type | Name |
|---|---|
| State | California |
| County | Marin County |
| Municipality | Larkspur City |
| Elementary School District | Larkspur Elementary School District (KG - 08) |
| Secondary School District | Tamalpais Union High School District (09 - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $2,071,597 (+2%) Land $1,479,712 Building $591,885 | |
| 2025 | $26,792.00 Homeowner's exemption | $2,030,980 Land $1,450,700 Building $580,280 |
| 2023 | $25,345.00 (+1.12%) Homeowner's exemption | $1,952,125 Land $1,394,375 Building $557,750 |
| 2022 | $25,064.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 440 William Ave in Zone AE, a high-risk flood area; flood insurance is required for federally backed loans.
Source: FEMA National Flood Hazard Layer, effective October 18, 2023 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone AE high risk |
|---|---|
| 100-Year Floodplain | Yes 1% annual chance |
| Floodway | No |
| Base Flood Elevation | 10.0 ft |
| Flood Insurance Requirement | Required federally backed loans |
| Flood Insurance Cost | Premium on File median of 23 policies |
| Nearby Flood Policies | 23 in force |
| Nearby Flood Claims | 2 (2014–2017) |
| Most Recent Claim | Jan 2017 · Severe Winter Storms, Flooding, And Mudslides |
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 440 William 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 | None beyond 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 416 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Unwired Fixed Wireless | 300 / 25 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T DSL · Fiber in parts of the area | 100 / 20 |
May also be available: Verizon.
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