131 Underhill Rd, Mill Valley, CA 94941 Property Records

Marin County property record for 131 Underhill Rd, Mill Valley, CA 94941

Property Summary

Property Type	Single Family Home
Details	4 bd · 4.5 ba · 4,428 sqft · built 1985
Lot Size	0.349 acres (15,200 sqft)
Owner	2 Company Names on Record
Last Sale	$2,565,000 (Aug 2013)
Tax Bill	$40,504 (2025)
Deeds & Mortgages	Apr 2020 Line of Credit Apr 2020 Mortgage + 2 more
Flood Zone	Zone X (minimal risk)
APN	`033-210-19`

Property Details

APN / Parcel Number

Primary APN	`033-210-19`

Interior

Bedrooms	4 Beds
Full Baths	4.5 Baths
Half Baths	1 Half Bath
Building Area	4,428 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1985
Effective Year Built	Effective 1998
Architectural Style	Contemporary
Lot Area	15,200 sqft (0.349 acres)
Garage Area	456 sqft
Parking Spaces	2 Parking Spaces
Deck Area	946 sqft
Patio Area	1,162 sqft

Utilities, Heating & Cooling

Heating System	Central

Location & Zoning

Street Address	131 UNDERHILL RD
City	MILL VALLEY
State	CA
Zip	94941-1461
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	MAP 18 PG 71 LOT 23
Legal Subdivision	SCOTT VLY MDWS
Legal Lot Number	23
Jurisdiction	MARIN CA
Township / Civil Division	SOUTHEAST MARIN
Census Block Group	1
Census Block	1005
Census Tract	126200

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	131 UNDERHILL RD, MILL VALLEY, CA 94941-1461
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust, Living Trust

Deeds, Mortgages & Sale History

Date	Document
Apr 14, 2020	Deed of Trust, Mortgage · Line of Credit FIRST REPUBLIC BANK
Apr 6, 2020	Deed of Trust, Mortgage FIRST REPUBLIC BK
Nov 16, 2018	Deed of Trust, Mortgage FIRST REPUBLIC BK
Nov 21, 2018	Quit Claim Deed, Transfer FIDELITY NATIONAL TITLE, FIDELITY NATIONAL TITLE CO

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Aug 2, 2013 · Amount on Record
Deed Sale	Aug 2, 2013 · Amount on Record
Deed Document Number	201351974
Last Transfer Date	Nov 16, 2018
Transfer Doc	0000040106
Record Updated	Oct 29, 2026

April 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	131 UNDERHILL RD, MILL VALLEY, CA 94941-1461
Transaction Type	Mortgage
Record Updated	Feb 7, 2021
Title Company	FIRST AMERICAN TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000014658
Date	Apr 14, 2020
Instrument	2020-0014658

Lender

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

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	300 Months
Due	Apr 26, 2045

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

April 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	131 UNDERHILL RD, MILL VALLEY, CA 94941-1461
Document Number	0000014657
Instrument Date	Apr 6, 2020
Transaction Type	Mortgage
Record Updated	May 1, 2020
Title Company	FIRST AMERICAN TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Revocable Trust
Address	131 UNDERHILL RD MILL VALLEY CA 949411461, MILL VALLEY, CA 94941-1461

Mortgage

Document Number	0000014657
Date	Apr 14, 2020
Instrument	14657

Lender

Name	FIRST REPUBLIC BK
Type	Bank
Address	111 PINE ST, SAN FRANCISCO, CA 94111-5602

Agreement

Amount	Amount Recorded
Term	360 Months
Due	Apr 13, 2050

Interest

Rate Type	Adjustable Rate
Rate	2.6%

November 2018: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	131 UNDERHILL RD, MILL VALLEY, CA 94941-1461
Document Number	0000040107
Instrument Date	Nov 16, 2018
Transaction Type	Mortgage
Record Updated	Dec 6, 2018
Title Company	FIDELITY NATIONAL TITLE, FIDELITY NATIONAL TITLE CO

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Revocable Trust
Address	131 UNDERHILL RD MILL VALLEY CA 949411461, MILL VALLEY, CA 94941-1461

Mortgage

Document Number	0000040107
Date	Nov 21, 2018
Instrument	40107

Lender

Name	FIRST REPUBLIC BK
Type	Bank
Address	111 PINE ST, SAN FRANCISCO, CA 94111-5602

Agreement

Amount	Amount Recorded
Term	360 Months
Due	Nov 20, 2048

Interest

Rate Type	Adjustable Rate
Rate	3.5%

November 2018: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	MARIN CA
Recording Date	Nov 21, 2018
Property Address	131 UNDERHILL RD, MILL VALLEY, CA 94941-1461
Document Number	0000040106
Instrument Date	Nov 13, 2018
Instrument	40106
Transaction Type	Transfer
Record Updated	Dec 6, 2018
Title Company	FIDELITY NATIONAL TITLE, FIDELITY NATIONAL TITLE CO

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Living Trust
Address	131 UNDERHILL RD MILL VALLEY CA 949411461, MILL VALLEY, CA 94941-1461

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		$3,268,362 (+2%) Land $1,706,686 Building $1,561,676
2025	$40,504.00 (+3.7%) Homeowner's exemption	$3,204,292 (+4.04%) Land $1,673,230 Building $1,531,062
2023	$39,057.00 (+1.86%) Homeowner's exemption	$3,079,891 Land $1,608,270 Building $1,471,621
2022	$38,345.00

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
Flood Insurance Cost	Premium on Record median of 86 individual policies
Community Rating System	Class 6 (20% premium discount)
Nearby Flood Policies	108 units insured incl. 22 condo units
Nearby Flood Claims	9 (1982–2019)
Claims Outside the SFHA	1 of 9
Most Recent Claim	Feb 2019 · Severe Winter Storms, Flooding, Landslides, And Mudslides
Claims by Event	Severe Storms, Flood, Mudslides & High Tide, Jan 1982 · 4 claims

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 192 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

May also be available: AT&T, T-Mobile.

Cell Coverage

5G and 4G LTE (outdoors only)

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