400 Hillside Ave, Mill Valley, CA 94941 Property Records

Marin County property record for 400 Hillside Ave, Mill Valley, CA 94941

Property Summary

Property Type	Single Family Home
Details	5 bd · 5 ba · 4,927 sqft · built 1930
Lot Size	0.934 acres (40,700 sqft)
Owner	2 Company Names on Record
Tax Bill	$58,085 (2025)
Deeds & Mortgages	Apr 2021 Mortgage
Flood Zone	Zone X (minimal risk)
APN	`029-072-34`

Property Details

APN / Parcel Number

Primary APN	`029-072-34`

Interior

Bedrooms	5 Beds
Full Baths	5 Baths
Building Area	4,927 sqft Living Area
Basement Area	47 sqft
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1930
Effective Year Built	Effective 1975
Lot Area	40,700 sqft (0.934 acres)
Garage Area	480 sqft
Parking Spaces	2 Parking Spaces
Pool Area	352 sqft
Deck Area	1,843 sqft
Patio Area	1,931 sqft

Utilities, Heating & Cooling

Heating System	Central

Location & Zoning

Street Address	400 HILLSIDE AVE
City	MILL VALLEY
State	CA
Zip	94941-1151
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Subdivision	BOLSA VLY MAP 01
Legal Lot Number	29
Jurisdiction	MARIN CA
Township / Civil Division	SOUTHEAST MARIN
Census Block Group	4
Census Block	4000
Census Tract	126100

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	400 HILLSIDE AVE, MILL VALLEY, CA 94941-1151
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust, Living Trust

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	May 16, 2002
Deed Sale	May 16, 2002
Prior Sale	Mar 8, 1996 · Amount on Record
Deed Document Number	200241255
Last Transfer Date	Oct 8, 2002
Transfer Doc	0000091570
Record Updated	Sep 20, 2026

April 2021: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	MARIN CA
Recording Date	Apr 6, 2021
Property Address	400 HILLSIDE AVE, MILL VALLEY, CA 94941-1151
Document Number	0000023035
Map Reference	MB 3 PG 51
Instrument Date	Mar 19, 2021
Instrument	2021-0023035
Transaction Type	Transfer
Record Updated	Jun 7, 2023
Title Company	FIRST AMERICAN TITLE COMPANY

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	Family Living Trust
Address	400 HILLSIDE AVE, MILL VALLEY, CA 94941-1151

Mortgage

Document Number	0000023036
Date	Apr 6, 2021
Instrument	2021-0023036

Lender

Name	FIRST REPUBLIC BANK
Type	Bank

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	360 Months
Due	Apr 1, 2051

Interest

Rate Type	Adjustable Rate
Rate	2.5%
Type Change Date	Apr 1, 2028
Change Frequency	Monthly
Min Rate At Change	2.95%
Max Rate At Change	10.9%
Index	1-Year CMT

Tax Assessment & Valuation

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

Year	Tax Bill	Assessed Value
2026		$4,975,706 (+2%) Land $3,013,480 Building $1,962,226
2025	$58,085.00 (+5.44%) Homeowner's exemption	$4,878,156 (+4.04%) Land $2,954,400 Building $1,923,756
2023	$55,089.00 (+0.86%) Homeowner's exemption	$4,688,769 Land $2,839,700 Building $1,849,069
2022	$54,620.00

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 minimal risk
Flood Insurance Requirement	Not required lenders may require it
Nearby Flood Policies	6 in force
Nearby Flood Claims	5 (1982–2009)
Claims Outside the SFHA	4 of 5
Most Recent Claim	Oct 2009 · other causes

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	Moderate above 40% of the US · lower than 76% of California
Wildfire Likelihood	0.06% 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 301 locations within half a mile, as of December 31, 2025

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

May also be available: T-Mobile, Verizon.

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