100 Underhill Rd, Mill Valley, CA 94941 Property Records

Marin County property record for 100 Underhill Rd, Mill Valley, CA 94941

Property Summary

Property Type	Single Family Home
Details	3 bd · 2.5 ba · 2,366 sqft · built 1986
Lot Size	0.235 acres (10,220 sqft)
Owner	2 Company Names on Record
Last Sale	$1,275,000 (Sep 2002)
Tax Bill	$24,360 (2025)
Deeds & Mortgages	Aug 2019 Line of Credit Sep 2017 Transfer
Flood Zone	Zone X (minimal risk)
APN	`033-220-04`

Property Details

APN / Parcel Number

Primary APN	`033-220-04`

Interior

Bedrooms	3 Beds
Full Baths	2.5 Baths
Half Baths	1 Half Bath
Building Area	2,366 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1986
Effective Year Built	Effective 1986
Architectural Style	Contemporary
Lot Area	10,220 sqft (0.235 acres)
Garage Area	528 sqft
Parking Spaces	2 Parking Spaces
Deck Area	462 sqft
Patio Area	462 sqft

Utilities, Heating & Cooling

Heating System	Central

Location & Zoning

Street Address	100 UNDERHILL RD
City	MILL VALLEY
State	CA
Zip	94941-1460
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT 4
Legal Subdivision	SCOTT VLY MDWS
Legal Lot Number	4
Jurisdiction	MARIN CA
Township / Civil Division	SOUTHEAST MARIN
Census Block Group	1
Census Block	1000
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	100 UNDERHILL RD, MILL VALLEY, CA 94941-1460
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Borrower in Default

Deeds, Mortgages & Sale History

Date	Document
Aug 16, 2019	Deed of Trust, Mortgage · Line of Credit FLAGSTAR BANK FSB
Sep 15, 2017	Quit Claim Deed, Transfer ATTORNEY ONLY

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Sep 27, 2002 · Amount on Record
Deed Sale	Sep 27, 2002 · Amount on Record
Prior Sale	Jun 12, 1996 · Amount on Record
Deed Document Number	200284907
Last Transfer Date	Sep 12, 2017
Transfer Doc	0000036910
Record Updated	Oct 29, 2026

August 2019: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	100 UNDERHILL RD, MILL VALLEY, CA 94941-1460
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	TITLE365

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000029434
Date	Aug 16, 2019
Instrument	2019-0029434

Lender

Name	FLAGSTAR BANK FSB
Type	Bank
Address	TROY, MI 48098

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	360 Months
Due	Aug 1, 2049

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

September 2017: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	MARIN CA
Recording Date	Sep 15, 2017
Property Address	100 UNDERHILL RD, MILL VALLEY, CA 94941-1460
Document Number	0000036910
Instrument Date	Sep 12, 2017
Instrument	36910
Transaction Type	Transfer
Record Updated	Sep 26, 2017
Title Company	ATTORNEY ONLY

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Personal Trust
Address	100 UNDERHILL RD MILL VALLEY CA 949411460, MILL VALLEY, CA 94941-1460

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		$1,883,379 (+2%) Land $1,218,657 Building $664,722
2025	$24,360.00 (+4.93%) Homeowner's exemption	$1,846,455 (+4.04%) Land $1,194,765 Building $651,690
2023	$23,215.00 (+4.39%) Homeowner's exemption	$1,774,774 Land $1,148,383 Building $626,391
2022	$22,239.00

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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