21 Underhill Rd, Mill Valley, CA 94941 Property Records

Marin County property record for 21 Underhill Rd, Mill Valley, CA 94941

Property Summary

Property Type	Single Family Home
Details	4 bd · 2 ba · 2,289 sqft · built 1962
Lot Size	0.258 acres (11,256 sqft)
Owner	Individual Name on Record
Last Sale	$324,000 (Oct 2022)
Tax Bill	$33,415 (2025)
Deeds & Mortgages	Oct 2022 Mortgage May 2020 Mortgage
Flood Zone	Zone X (minimal risk)
APN	`033-152-03`

Property Details

APN / Parcel Number

Primary APN	`033-152-03`

Interior

Bedrooms	4 Beds
Full Baths	2 Baths
Building Area	2,289 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1962
Effective Year Built	Effective 1967
Architectural Style	Contemporary
Lot Area	11,256 sqft (0.258 acres)
Garage Area	592 sqft
Parking Spaces	2 Parking Spaces

Utilities, Heating & Cooling

Heating System	Central

Location & Zoning

Street Address	21 UNDERHILL RD
City	MILL VALLEY
State	CA
Zip	94941-1423
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Subdivision	SCOTT VLY #1
Legal Lot Number	17
Jurisdiction	MARIN CA
Township / Civil Division	SOUTHEAST MARIN
Census Block Group	1
Census Block	1009
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	Individual Name on Record
Mailing Address	21 UNDERHILL RD, MILL VALLEY, CA 94941-1423
Occupancy	Owner Occupied
Owner Type	Individual

Deeds, Mortgages & Sale History

Date	Document
Oct 13, 2022	Intrafamily Transfer, Transfer · Conventional Mortgage ROCKET MORTGAGE LLC
May 29, 2020	Deed of Trust, Mortgage · Conventional Mortgage JPMORGAN CHASE BANK NA

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Oct 13, 2022 · Amount on Record
Deed Sale	Oct 13, 2022 · Amount on Record
Prior Sale	May 20, 2016 · Amount on Record
Deed Document Number	202234847
Prior Transfer Date	Jun 23, 1994
Prior Transfer Doc	0000051255
Record Updated	Oct 29, 2026

October 2022: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	MARIN CA
Recording Date	Oct 13, 2022
Property Address	21 UNDERHILL RD, MILL VALLEY, CA 94941-1423
Document Number	0000034847
Map Reference	MB 10 PG 69
Instrument Date	Feb 18, 2022
Instrument	2022-0034847
Transaction Type	Transfer
Record Updated	Oct 26, 2022
Title Company	AMROCK INC, AMROCK LLC

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name
Address	21 UNDERHILL RD, 21, MILL VALLEY, CA 94941-1423

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	21 UNDERHILL RD, MILL VALLEY, CA 94941-1423

Mortgage

Document Number	0000034848
Date	Oct 13, 2022
Instrument	2022-0034848

Lender

Name	ROCKET MORTGAGE LLC
Type	Mortgage Company

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	173 Months
Due	Mar 1, 2037

May 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	21 UNDERHILL RD, MILL VALLEY, CA 94941-1423
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	NORTH AMERICAN TITLE CO INC

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000021212
Date	May 29, 2020
Instrument	2020-0021212

Lender

Name	JPMORGAN CHASE BANK NA
Type	Bank
Address	COLUMBUS, OH 43240

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Jun 1, 2050

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		$2,662,405 (+2%) Land $1,756,825 Building $905,580
2025	$33,415.00 (+5.9%)	$2,610,212 (+4.04%) Land $1,722,385 Building $887,827
2023	$31,552.00 (+4.6%)	$2,508,870 Land $1,655,513 Building $853,357
2022	$30,165.00

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 67% of the US · lower than 81% of California
Wildfire Likelihood	0.03% annual chance
Exposure	Indirect within ember reach
Adjoins Burnable Land	Yes

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 105 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.

Cell Coverage

5G and 4G LTE (outdoors only)

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