450 William Ave, Larkspur, CA 94939 Property Records

Marin County property record for 450 William Ave, Larkspur, CA 94939

Property Summary

Property Type	Single Family Home
Details	4 bd · 3 ba · 2,093 sqft · built 1942
Lot Size	0.133 acres (5,775 sqft)
Owner	2 Company Names on File
Tax Bill	$8,677 (2025)
Deeds & Mortgages	Jan 2022 Mortgage Jul 2017 Transfer + 1 more
Flood Zone	Zone AE (high risk)
APN	`021-212-14`

Property Details

APN / Parcel Number

Primary APN	`021-212-14`

Interior

Bedrooms	4 Beds
Full Baths	3 Baths
Building Area	2,093 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1942
Effective Year Built	Effective 1986
Architectural Style	Contemporary
Lot Area	5,775 sqft (0.133 acres)
Garage Area	638 sqft
Parking Spaces	2 Parking Spaces
Deck Area	44 sqft
Patio Area	44 sqft

Utilities, Heating & Cooling

Heating System	Central

Location & Zoning

Street Address	450 WILLIAM AVE
City	LARKSPUR
State	CA
Zip	94939-1530
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	MAP 5 PG 93 LOT 91
Legal Subdivision	HEATHER GARDENS 02
Legal Tract	2
Legal Lot Number	91
Jurisdiction	MARIN CA
Township / Civil Division	ROSS VALLEY
Census Block Group	1
Census Block	1005
Census Tract	120002

Owner

450 William Ave is owned by a company that acquired it in July 2017 and is owner-occupied.

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

Owner of Record	2 Company Names on File
Mailing Address	450 WILLIAM AVE, LARKSPUR, CA 94939-1530
Occupancy	Owner Occupied
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.

Deeds, Mortgages & Sale History

Date	Document
Jan 12, 2022	Deed of Trust, Mortgage · Conventional Mortgage SAN FRANCISCO FIRE CU
Jul 20, 2017	Quit Claim Deed, Transfer ATTORNEY ONLY
May 23, 2017	Affidavit of Death, Transfer ATTORNEY ONLY

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Transfer Date	Jul 6, 2017
Transfer Doc	0000028907
Record Updated	Sep 20, 2026

January 2022: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	450 WILLIAM AVE, LARKSPUR, CA 94939-1530
Transaction Type	Mortgage
Record Updated	Jan 31, 2022
Title Company	CHICAGO TITLE COMPANY, CHICAGO TITLE CO

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	450 WILLIAM AVE, LARKSPUR, CA 94939-1530

Mortgage

Document Number	0000001553
Date	Jan 12, 2022
Instrument	2022-0001553

Lender

Name	SAN FRANCISCO FIRE CU
Type	Credit Union
Address	SAN FRANCISCO, CA 94118

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Feb 1, 2052

July 2017: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	MARIN CA
Recording Date	Jul 20, 2017
Property Address	450 WILLIAM AVE, LARKSPUR, CA 94939-1530
Document Number	0000028907
Instrument Date	Jul 6, 2017
Instrument	28907
Transaction Type	Transfer
Record Updated	Aug 1, 2017
Title Company	ATTORNEY ONLY

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Personal Trust
Address	450 WILLIAM AVE LARKSPUR CA 949391530, LARKSPUR, CA 94939-1530

May 2017: Affidavit of Death, Transfer

Document Type	Affidavit of Death
Jurisdiction	MARIN CA
Recording Date	May 23, 2017
Property Address	450 WILLIAM AVE, LARKSPUR, CA 94939-1530
Document Number	0000020542
Instrument Date	May 16, 2017
Instrument	20542
Transaction Type	Transfer
Record Updated	May 30, 2017
Title Company	ATTORNEY ONLY

Transaction

Tax	$0.00
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	450 WILLIAM AVE LARKSPUR CA 949391530, LARKSPUR, CA 94939-1530

Tax Assessment & Valuation

The 2025 property tax bill for 450 William Ave was $8,677 with a homeowner's exemption.

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		$563,484 (+2%) Land $119,476 Building $444,008
2025	$8,677.00 Homeowner's exemption	$552,438 Land $117,134 Building $435,304
2023	$8,210.00 (+1.68%) Homeowner's exemption	$530,991 Land $112,587 Building $418,404
2022	$8,074.00

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

Flood

FEMA maps place 450 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

Wildfire risk around 450 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.

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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