343 Summit Ave, Mill Valley, CA 94941 Property Records

Marin County property record for 343 Summit Ave, Mill Valley, CA 94941

Property Summary

Property Type	Duplex
Details	8 bd · 7.5 ba · 4,820 sqft · built 1939
Lot Size	1.53 acres (66,672 sqft)
Owner	2 Company Names on File
Tax Bill	$81,640 (2025)
Deeds & Mortgages	Feb 2022 Transfer
Flood Zone	Zone X (minimal risk)
APN	`027-191-62`

Property Details

APN / Parcel Number

Primary APN	`027-191-62`
Alternative APN	`027-191-69`

Interior

Bedrooms	8 Beds
Full Baths	7.5 Baths
Half Baths	1 Half Bath
Units	2 Units
Building Area	4,820 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1939
Effective Year Built	Effective 1967
Architectural Style	Duplex Single
Lot Area	66,672 sqft
Garage Area	778 sqft
Parking Spaces	3 Parking Spaces
Deck Area	3,888 sqft

Utilities, Heating & Cooling

Heating System	Central

Location & Zoning

Old Parcel Number	02719162
Street Address	343 SUMMIT AVE
City	MILL VALLEY
State	CA
Zip	94941-1001
Property Category	Residential
Property Type	Residential > Multi-Unit > Duplex
Jurisdiction	MARIN CA
Township / Civil Division	SOUTHEAST MARIN
Census Block Group	5
Census Block	5001
Census Tract	127000

Owner

Source: Marin County records · APN 027-191-62

Assessment roll updated July 13, 2026 · Last verified August 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 File
Mailing Address	343 SUMMIT AVE, MILL VALLEY, CA 94941-1001
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Borrower in Default

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Verified Names on Deed
Last Transfer Date	Sep 17, 2022
Transfer Doc	0000033286
Record Updated	Sep 20, 2026

February 2022: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	MARIN CA
Recording Date	Feb 24, 2022
Property Address	343 SUMMIT AVE, MILL VALLEY, CA 94941-1001
Document Number	0000007265
Map Reference	VOL 1 PG 101
Instrument Date	Mar 24, 2021
Instrument	2022-0007265
Transaction Type	Transfer
Record Updated	Aug 03, 2023

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt
Additional	Intrafamily Transfer Multiple Parcels

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Revocable Trust
Address	343 SUMMIT AVE, MILL VALLEY, CA 94941-1001

Tax Assessment & Valuation

Source: Marin County records · Assessment roll updated July 13, 2026 · Last verified August 2026

Property Jurisdictions

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)

Tax Bill & Assessment History

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

Year	Tax Bill	Assessed Value
2026		$6,512,466 (+2%) Land $4,523,851 Building $1,988,615
2025	$81,640.00 (+6.92%) Homeowner's exemption	$6,384,783 (+4.04%) Land $4,435,159 Building $1,949,624
2023	$76,356.00 Homeowner's exemption	$6,136,912 Land $4,262,984 Building $1,873,928

Flood & Wildfire

Source: FEMA National Flood Hazard Layer, Marin County (06041C), as of October 18, 2023 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 060411270005, as of September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition, as of 2020 · Last verified October 2026

Flood

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it
Flood Insurance Cost	Premium on Record median of 14 policies
Community Rating System	Class 6 (20% premium discount)
Nearby Flood Policies	14 in force
Nearby Flood Claims	11 (1983–2017)
Claims Outside the SFHA	4 of 11
Most Recent Claim	Mar 2017 · river or lake flooding
Claims by Event	Severe Storms, Flooding, Mudslides, And Landslides, Dec 2005 · 3 claims

Wildfire

Wildfire Risk	Low lower than 65% of the US · lower than 79% of California
Wildfire Likelihood	0.04% annual chance
Exposure	Indirect within ember reach
Adjoins Burnable Land	Yes

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.

Internet Providers

Source: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026

Provider	Max Down / Up (Mbps)
AT&T Fiber	5,000 / 5,000
Xfinity Cable	2,000 / 250
Unwired Fixed Wireless	300 / 25

Based on FCC filings for 313 locations within half a mile of this property.

Cell Coverage

5G (outdoors only) and 4G LTE

Drinking Water

Source: EPA Safe Drinking Water Information System, water system CA2110002, as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026

Water System	MARIN MUNICIPAL WATER DISTRICT serves 188,116 people
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 as reported to EPA, 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. The full violation and enforcement history is in the system's EPA record.