11 William Ave, Larkspur, CA 94939 Property Records

Marin County property record for 11 William Ave, Larkspur, CA 94939

Property Summary

Property Type	Single Family Home
Details	5 bd · 4.5 ba · 5,065 sqft · built 2005
Lot Size	0.172 acres (7,500 sqft)
Owner	2 Company Names on Record
Last Sale	$4,695,000 (Dec 2020)
Tax Bill	$61,417 (2025)
Deeds & Mortgages	May 2021 Mortgage Dec 2020 Sale + 3 more
Flood Zone	Zone X (moderate risk)
APN	`021-171-13`

Property Details

APN / Parcel Number

Primary APN	`021-171-13`

Interior

Bedrooms	5 Beds
Full Baths	4.5 Baths
Half Baths	1 Half Bath
Building Area	5,065 sqft Living Area
Basement Area	480 sqft
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 2005
Effective Year Built	Effective 2005
Architectural Style	Contemporary
Lot Area	7,500 sqft (0.172 acres)
Garage Area	247 sqft
Parking Spaces	1 Parking Space
Pool Area	400 sqft
Deck Area	36 sqft
Patio Area	36 sqft

Utilities, Heating & Cooling

Heating System	Central

Location & Zoning

Street Address	11 WILLIAM AVE
City	LARKSPUR
State	CA
Zip	94939-2027
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Subdivision	BALTIMORE PARK SUB 1
Legal Lot Number	7
Jurisdiction	MARIN CA
Township / Civil Division	ROSS VALLEY
Census Block Group	2
Census Block	2000
Census Tract	120002

Owner

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

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record	2 Company Names on Record
Mailing Address	11 WILLIAM AVE, LARKSPUR, CA 94939-2027
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Borrower in Default

Deeds, Mortgages & Sale History

Date	Document
May 10, 2021	Deed of Trust, Mortgage · Conventional Mortgage MORGAN STANLEY PRIVATE BANK NA
Dec 30, 2020	Grant Deed, Transfer FIRST AMERICAN TITLE
Oct 13, 2017	Grant Deed, Transfer FIDELITY NATIONAL TITLE
Aug 21, 2017	Trustee's Deed, Construction Loan · Construction Mortgage FIRST REPUBLIC BK
Feb 10, 2017	Intrafamily Transfer, Transfer · Conventional Mortgage FIRST REPUBLIC BANK

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Dec 30, 2020 · Amount on Record
Deed Sale	Dec 30, 2020 · Amount on Record
Prior Sale	Oct 13, 2017 · Amount on Record
Deed Document Number	202067857
Prior Transfer Date	Jul 14, 2011
Prior Transfer Doc	0000035669
Record Updated	Sep 20, 2026

May 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	11 WILLIAM AVE, LARKSPUR, CA 94939-2027
Transaction Type	Mortgage
Record Updated	May 31, 2021
Title Company	FIRSTAMERICAN TITLE COMPANY, FIRST AMERICAN TITLE COMPANY

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	11 WILLIAM AVE, LARKSPUR, CA 94939-2027

Mortgage

Document Number	0000031326
Date	May 10, 2021
Instrument	2021-0031326

Lender

Name	MORGAN STANLEY PRIVATE BANK NA
Type	Bank
Address	CINCINNATI, OH 45245

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Jun 1, 2051

December 2020: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	MARIN CA
Recording Date	Dec 30, 2020
Property Address	11 WILLIAM AVE, LARKSPUR, CA 94939-2027
Document Number	0000067857
Instrument Date	Dec 21, 2020
Instrument	67857
Transaction Type	Transfer
Record Updated	Jan 13, 2021
Title Company	FIRST AMERICAN TITLE

Transaction

Amount	Amount Recorded
Tax	$5,165.00
Amount Accuracy	Full Value
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Revocable Trust
Address	41 AUSTIN AVE SAN ANSELMO CA 949602934, SAN ANSELMO, CA 94960-2934

October 2017: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	MARIN CA
Recording Date	Oct 13, 2017
Property Address	11 WILLIAM AVE, LARKSPUR, CA 94939-2027
Document Number	0000040679
Instrument Date	Oct 6, 2017
Instrument	40679
Transaction Type	Transfer
Record Updated	Mar 27, 2018
Title Company	FIDELITY NATIONAL TITLE

Transaction

Amount	Amount Recorded
Tax	$4,290.00
Amount Accuracy	Full Value
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Revocable Trust
Address	11 WILLIAM AVE LARKSPUR CA 949392027, LARKSPUR, CA 94939-2027

August 2017: Trustee's Deed, Construction Loan

Document Type	Trustee's Deed
Jurisdiction	MARIN CA
Recording Date	Aug 21, 2017
Property Address	11 WILLIAM AVE, LARKSPUR, CA 94939-2027
Instrument Date	Aug 16, 2017
Instrument	33370
Transaction Type	Construction Loan
Record Updated	Aug 31, 2017
Title Company	STEWART TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Living Trust
Address	11 WILLIAM AVE LARKSPUR CA 949392027, LARKSPUR, CA 94939-2027

Mortgage

Document Number	0000033370
Date	Aug 21, 2017
Instrument	33370

Lender

Name	FIRST REPUBLIC BK
Type	Bank
Address	SAN FRANCISCO, CA 94111

Agreement

Type	Construction Mortgage
Amount	Amount Recorded
Term	12 Months
Due	Aug 20, 2018

Interest

Rate Type	Adjustable Rate
Rate	4.25%

February 2017: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	MARIN CA
Recording Date	Feb 10, 2017
Property Address	11 WILLIAM AVE, LARKSPUR, CA 94939-2027
Document Number	0000005918
Map Reference	VOL2 PG90
Instrument Date	Feb 7, 2017
Instrument	2017-0005918
Transaction Type	Transfer
Record Updated	Aug 13, 2021
Title Company	OLD REPUBLIC TITLE CO

Transaction

Tax	$0.00
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name
Address	00000

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Family Trust
Address	11 WILLIAM AVE, LARKSPUR, CA 94939-2027

Mortgage

Document Number	0000005919
Date	Feb 10, 2017
Instrument	2017-0005919

Lender

Name	FIRST REPUBLIC BANK
Type	Bank

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	289 Months
Due	Mar 1, 2041

Tax Assessment & Valuation

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		$5,183,561 (+2%) Land $3,312,180 Building $1,871,381
2025	$61,417.00 (+5.55%) Homeowner's exemption	$5,081,961 (+4.04%) Land $3,247,260 Building $1,834,701
2023	$58,189.00 (+0.81%) Homeowner's exemption	$4,884,678 Land $3,121,200 Building $1,763,478
2022	$57,721.00

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

Flood

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 A, within 500 ft
Flood Insurance Requirement	Not required lenders may require it
Flood Insurance Cost	Premium on Record median of 20 policies
Nearby Flood Policies	20 in force
Nearby Flood Claims	2 (2017–2023)
Claims Outside the SFHA	2 of 2
Most Recent Claim	Mar 2023 · Severe Storm And Flooding

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

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.

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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