42 Underhill Rd, Mill Valley, CA 94941 Property Records

Marin County property record for 42 Underhill Rd, Mill Valley, CA 94941

Property Summary

Property Type	Single Family Home
Details	3 bd · 2.5 ba · 2,875 sqft · built 1965
Lot Size	0.207 acres (9,016 sqft)
Owner	2 Trust Names on File
Last Sale	$2,910,000 (Apr 2026)
Tax Bill	$5,638 (2025)
Deeds & Mortgages	Jun 2024 Line of Credit Apr 2026 Sale & Mortgage + 1 more
Flood Zone	Zone X (minimal risk)
APN	`033-182-06`

Property Details

APN / Parcel Number

Primary APN	`033-182-06`

Interior

Bedrooms	3 Beds
Full Baths	2.5 Baths
Half Baths	1 Half Bath
Building Area	2,875 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1965
Effective Year Built	Effective 1970
Architectural Style	Contemporary
Lot Area	9,016 sqft (0.207 acres)
Garage Area	504 sqft
Parking Spaces	2 Parking Spaces
Pool Area	416 sqft
Deck Area	320 sqft
Patio Area	320 sqft

Utilities, Heating & Cooling

Heating System	Central

Location & Zoning

Street Address	42 UNDERHILL RD
City	MILL VALLEY
State	CA
Zip	94941-1437
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	MAP F2 606
Legal Subdivision	SCOTT VLY 03
Legal Lot Number	109
Jurisdiction	MARIN CA
Township / Civil Division	SOUTHEAST MARIN
Census Block Group	1
Census Block	1007
Census Tract	126200

Owner

42 Underhill Rd is owner-occupied and held in a trust since April 2026.

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

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Owner of Record	2 Trust Names on File
Mailing Address	42 UNDERHILL RD, MILL VALLEY, CA 94941-1437
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust

Deeds, Mortgages & Sale History

Date	Document
Jun 12, 2024	Deed of Trust, Mortgage · Line of Credit REDWOOD CU
Apr 24, 2026	Grant Deed, Transfer · Conventional Mortgage CMG MORTGAGE INC
Apr 24, 2026	Affidavit of Death of Trustee, Transfer

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Apr 24, 2026 · Amount on File
Deed Sale	Apr 24, 2026 · Amount on File
Deed Document Number	202612036
Prior Transfer Date	Jun 2, 2007
Prior Transfer Doc	0000034742
Record Updated	Oct 29, 2026

June 2024: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	42 UNDERHILL RD, MILL VALLEY, CA 94941-1437
Transaction Type	Mortgage
Record Updated	May 8, 2026
Title Company	FIRST AMERICAN TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	42 UNDERHILL RD, MILL VALLEY, CA 94941-1437

Mortgage

Document Number	0000016773
Date	Jun 12, 2024
Instrument	2024-0016773

Lender

Name	REDWOOD CU
Type	Credit Union
Address	SANTA ROSA, CA 95403

Agreement

Type	Line of Credit
Amount	Amount on Record
Term	300 Months
Due	Jun 15, 2049

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

April 2026: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	MARIN CA
Recording Date	Apr 24, 2026
Property Address	42 UNDERHILL RD, MILL VALLEY, CA 94941-1437
Document Number	0000012036
Instrument Date	Apr 22, 2026
Instrument	2026.12036
Transaction Type	Transfer
Record Updated	May 7, 2026
Title Company	OLD REPUBLIC TITLE

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$323,301.00
Amount Accuracy	Full Amount Stated
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Trust
Address	42 UNDERHILL RD, MILL VALLEY, CA 94941-1437

Mortgage

Document Number	0000012037,
Date	Apr 24, 2026
Instrument	2026..12037

Lender

Name	CMG MORTGAGE INC

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	360 Months
Due	May 1, 2056

Interest

Rate Type	Fixed Rate
Rate	6.11%
Initial Type	Fixed Rate
Max Rate	-1%

April 2026: Affidavit of Death of Trustee, Transfer

Document Type	Affidavit of Death of Trustee
Jurisdiction	MARIN CA
Recording Date	Apr 24, 2026
Property Address	42 UNDERHILL RD, MILL VALLEY, CA 94941-1437
Document Number	0000012035
Instrument Date	Apr 17, 2026
Instrument	202612035
Transaction Type	Transfer
Record Updated	Aug 28, 2026

Transaction

Tax	$0.00
Amount Accuracy	Full Amount Stated

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Family Revocable Trust
Address	392 AVENIDA BARBERA, SONOMA, CA 95476-8069
Investor	Possibly a Property Investor

Tax Assessment & Valuation

The 2025 property tax bill for 42 Underhill Rd was $5,638.

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		$304,431 (+2%) Land $62,517 Building $241,914
2025	$5,638.00 Homeowner's exemption	$298,463 Land $61,291 Building $237,172
2023	$5,393.00 (-1.43%) Homeowner's exemption	$286,875 Land $58,912 Building $227,963
2022	$5,471.00

Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.

Flood

FEMA maps place 42 Underhill Rd in Zone X, an area of minimal flood risk, though there have been 9 flood claims nearby since 1982.

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 File 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

Wildfire risk around 42 Underhill Rd 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	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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