123 Underhill Rd, Mill Valley, CA 94941 Property Records

Marin County property record for 123 Underhill Rd, Mill Valley, CA 94941 · Last verified August 2026

Property Summary

Property Type	Single Family Home
Details	3 bd · 3.5 ba · 3,031 sqft · built 1986
Lot Size	0.207 acres (9,000 sqft)
Owner	2 Individual Names on File
Tax Bill	$23,211 (2025)
Deeds & Mortgages	Dec 2022 Transfer Dec 2022 Transfer + 1 more
Flood Zone	Zone X (minimal risk)
APN	`033-210-21`

Property Details

APN / Parcel Number

Primary APN	`033-210-21`

Interior

Bedrooms	3 Beds
Full Baths	3.5 Baths
Half Baths	1 Half Bath
Building Area	3,031 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1986
Effective Year Built	Effective 1986
Architectural Style	Contemporary
Lot Area	9,000 sqft (0.207 acres)
Garage Area	441 sqft
Parking Spaces	2 Parking Spaces
Deck Area	753 sqft
Patio Area	753 sqft

Utilities, Heating & Cooling

Heating System	Central

Location & Zoning

Street Address	123 UNDERHILL RD
City	MILL VALLEY
State	CA
Zip	94941-1461
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT 21
Legal Subdivision	SCOTT VLY MDWS
Legal Lot Number	21
Jurisdiction	MARIN CA
Township / Civil Division	SOUTHEAST MARIN
Census Block Group	1
Census Block	1005
Census Tract	126200

Owner

Source: Marin County records · APN 033-210-21

Assessment roll updated July 13, 2026 · Last verified August 2026

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record	2 Individual Names on File
Mailing Address	123 UNDERHILL RD, MILL VALLEY, CA 94941-1461
Occupancy	Owner Occupied
Owner Type	Individual

Deeds, Mortgages & Sale History

Date	Document
Dec 22, 2022	Intrafamily Transfer, Transfer
Dec 22, 2022	Intrafamily Transfer, Transfer
Dec 22, 2022	Intrafamily Transfer, Transfer

Assessor's Deed Record

Deed Names	2 Verified Names on Deed
Last Transfer Date	Dec 30, 2022
Transfer Doc	0000000313
Record Updated	Sep 20, 2026

December 2022: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	MARIN CA
Recording Date	Dec 22, 2022
Property Address	123 UNDERHILL RD, MILL VALLEY, CA 94941-1461
Document Number	0000040849
Map Reference	VOL 18 PG 71
Instrument Date	Nov 22, 2022
Instrument	2022-0040849
Transaction Type	Transfer
Record Updated	Jan 03, 2023

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
Address	123 UNDERHILL RD, MILL VALLEY, CA 94941-1461

December 2022: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	MARIN CA
Recording Date	Dec 22, 2022
Property Address	123 UNDERHILL RD, MILL VALLEY, CA 94941-1461
Document Number	0000040850
Map Reference	VOL 18 PG 71
Instrument Date	Nov 22, 2022
Instrument	2022-0040850
Transaction Type	Transfer
Record Updated	Jan 03, 2023

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	Joint Tenants with Right of Survivorship
Address	123 UNDERHILL RD, MILL VALLEY, CA 94941-1461

December 2022: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	MARIN CA
Recording Date	Dec 22, 2022
Property Address	123 UNDERHILL RD, MILL VALLEY, CA 94941-1461
Document Number	0000040848
Map Reference	VOL 18 PG 71
Instrument Date	Nov 22, 2022
Instrument	2022-0040848
Transaction Type	Transfer
Record Updated	Jan 03, 2023

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
Address	123 UNDERHILL RD, MILL VALLEY, CA 94941-1461

Tax Assessment & Valuation

Source: Marin County records · Assessment roll updated July 13, 2026 · Last verified August 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

Assessed value is set for property tax purposes and is not a market price estimate.

Year	Tax Bill	Assessed Value
2026		$1,894,234 (+2%) Land $993,697 Building $900,537
2025	$23,211.00 (-4.32%) Homeowner's exemption	$1,857,099 (+4.04%) Land $974,216 Building $882,883
2023	$24,259.00 (+76.78%) Homeowner's exemption	$1,784,999 Land $936,393 Building $848,606
2022	$13,723.00

Flood & Wildfire

Source: FEMA National Flood Hazard Layer, Marin County (06041C), updated October 18, 2023 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 060411262001, refreshed September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026

Flood

FEMA Flood Zone	Zone X
Special Flood Hazard Area	No
Flood Hazard	Minimal
500-Year Floodplain	No
Flood Insurance Cost	Premium on Record median of 86 individual NFIP policies nearby
Community Rating System	Class 6 (20% premium discount)
Nearby Flood Policies	108 units insured 22 under condo master policies
Nearby Flood Claims	9 (1982–2019)
Claims Outside the SFHA	1 of 9
Most Recent Claim	Feb 2019, other causes, Severe Winter Storms, Flooding, Landslides, And Mudslides
Claims By Storm	Severe Storms, Flood, Mudslides & High Tide, Jan 1982 · 4 claims

Wildfire

Wildfire Risk	Not rated no burnable land in reach
Wildfire Likelihood	Negligible
Exposure	None beyond ember reach

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.

Internet Providers

Source: FCC Broadband Data Collection, availability as of December 31, 2025 · Published October 2026 · based on 192 locations within about half a mile of this property

Provider	Technology	Download / Upload (Mbps)
Xfinity	Cable	2,000 / 250
Unwired	Fixed Wireless	300 / 25
Starlink	Satellite (low-earth orbit)	280 / 30

May also be available at this address: T-Mobile USA, AT&T. Availability varies by address; speeds are provider-advertised maximums, not measured.

Mobile Coverage

5G (outdoors only) and 4G LTE

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