328 William Ave, Larkspur, CA 94939 Property Records

Marin County property record for 328 William Ave, Larkspur, CA 94939

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,516 sqft · built 1943
Lot Size	0.11 acres (4,784 sqft)
Owner	2 Individual Names on File
Last Sale	$765,000 (Nov 2010)
Tax Bill	$17,846 (2025)
Deeds & Mortgages	Apr 2021 Mortgage Apr 2018 Line of Credit
Flood Zone	Zone X (moderate risk)
APN	`021-211-13`

Property Details

APN / Parcel Number

Primary APN	`021-211-13`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Building Area	1,516 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1943
Effective Year Built	Effective 2004
Architectural Style	Contemporary
Lot Area	4,784 sqft (0.11 acres)
Garage Area	221 sqft
Parking Spaces	1 Parking Space
Pool Area	69 sqft
Deck Area	156 sqft
Patio Area	624 sqft

Utilities, Heating & Cooling

Heating System	Central

Location & Zoning

Street Address	328 WILLIAM AVE
City	LARKSPUR
State	CA
Zip	94939-1529
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	MAP 5 PG 97 LOT 59
Legal Subdivision	HEATHER GARDENS 03
Legal Tract	3
Legal Lot Number	59
Jurisdiction	MARIN CA
Township / Civil Division	ROSS VALLEY
Census Block Group	1
Census Block	1002
Census Tract	120002

Owner

328 William Ave is owned and occupied by two individuals who acquired it in December 2020.

Source: Marin County records, as of July 13, 2026

Owner of Record	2 Individual Names on File
Mailing Address	328 WILLIAM AVE, LARKSPUR, CA 94939-1529
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Joint Tenants with Right of Survivorship

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Deeds, Mortgages & Sale History

Date	Document
Apr 27, 2021	Intrafamily Transfer, Transfer · Conventional Mortgage MEADOWBROOK FINCL MTG BANKERS CORP
Apr 5, 2018	Deed of Trust, Mortgage · Line of Credit BANK OF NAT'L TR & SVGS

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Nov 16, 2010 · Amount on File
Deed Sale	Nov 16, 2010 · Amount on File
Deed Document Number	201058475
Last Transfer Date	Dec 10, 2020
Transfer Doc	0000028257
Record Updated	Oct 29, 2026

April 2021: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	MARIN CA
Recording Date	Apr 27, 2021
Property Address	328 WILLIAM AVE, LARKSPUR, CA 94939-1529
Document Number	0000028257
Map Reference	VOL 5 PG 97
Instrument Date	Dec 10, 2020
Instrument	2021-0028257
Transaction Type	Transfer
Record Updated	May 12, 2021
Title Company	BNT TITLE COMPANY/CA, BNT TITLE COMPANY OF CA

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants with Right of Survivorship
Address	328 WILLIAM AVE, LARKSPUR, CA 94939-1529

Mortgage

Document Number	0000028258
Date	Apr 27, 2021
Instrument	2021-0028258

Lender

Name	MEADOWBROOK FINCL MTG BANKERS CORP
Type	Mortgage Company

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	357 Months
Due	Jan 1, 2051

April 2018: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	328 WILLIAM AVE, LARKSPUR, CA 94939-1529
Document Number	0000013358
Instrument Date	Apr 5, 2018
Transaction Type	Mortgage
Record Updated	Apr 26, 2018
Title Company	AMERICAN TITLE COMPANY

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	328 WILLIAM AVE LARKSPUR CA 949391529, LARKSPUR, CA 94939-1529

Mortgage

Document Number	0000013358
Date	Apr 16, 2018
Instrument	13358

Lender

Name	BANK OF NAT'L TR & SVGS
Type	Bank
Address	TAMPA, FL 33634

Agreement

Type	Line of Credit
Amount	Amount on Record

Interest

Rate Type	Adjustable Rate

Tax Assessment & Valuation

The 2025 property tax bill for 328 William Ave was $17,846.

Source: Marin County assessment roll, as of July 13, 2026

Property Jurisdictions

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)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$1,250,840 (+2%) Land $797,099 Building $453,741
2025	$17,846.00	$1,226,317 Land $781,471 Building $444,846
2023	$16,862.00 (+1.4%)	$1,178,711 Land $751,135 Building $427,576
2022	$16,629.00

Assessed value is set for property tax purposes and is not a market price estimate.

Flood

FEMA maps place 328 William Ave in Zone X, an area of moderate 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 moderate risk
500-Year Floodplain	Yes 0.2% annual chance
Nearest Special Flood Hazard Area	Zone AE, within 500 ft
Flood Insurance Requirement	Not required lenders may require it
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

Wildfire risk around 328 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	Direct burnable vegetation

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

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

Violations Reported to EPA

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.

Internet Providers

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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