308 Sheffield Ave, Mill Valley, CA 94941 Property Records

Marin County property record for 308 Sheffield Ave, Mill Valley, CA 94941

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,608 sqft · built 1979
Lot Size	0.145 acres (6,300 sqft)
Owner	2 Company Names on File
Last Sale	$1,700,000 (Jun 2025)
Tax Bill	$21,884 (2025)
Deeds & Mortgages	Apr 2020 Mortgage Oct 2018 Sale & Mortgage
Flood Zone	Zone X (minimal risk)
APN	`050-112-12`

Property Details

APN / Parcel Number

Primary APN	`050-112-12`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Total Rooms	6 Rooms
Stories	2 Stories
Building Area	1,608 sqft Living Area
Basement Area	456 sqft
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1979
Effective Year Built	Effective 1987
Architectural Style	Contemporary
Exterior Material	Wood Siding
Construction Type	Frame
Roof Material	Wood Shingle
Lot Area	6,300 sqft (0.145 acres)
Garage Area	400 sqft
Parking Spaces	2 Parking Spaces
Deck Area	344 sqft
Patio Area	344 sqft

Utilities, Heating & Cooling

Heating System	Central
Sewer	Municipal
Water Source	Commercial

Location & Zoning

Street Address	308 SHEFFIELD AVE
City	MILL VALLEY
State	CA
Zip	94941-3860
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	L8&L9 B2 MARIN HEIGHTS #B /B4P99 M
Legal Subdivision	MARIN HEIGHTS B
Legal Lot Number	8,9
Jurisdiction	MARIN CA
Township / Civil Division	SOUTHEAST MARIN
Census Block Group	1
Census Block	1006
Census Tract	128100

Owner

308 Sheffield Ave is owned by a company that bought it in June 2025.

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

Owner of Record	2 Company Names on File
Mailing Address	308 SHEFFIELD AVE, MILL VALLEY, CA 94941-3860
Owner Type	Company
Vesting	Life Tenant

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

Deeds, Mortgages & Sale History

Date	Document
Apr 28, 2020	Intrafamily Transfer, Transfer · Conventional Mortgage FLAGSTAR BANK FSB
Oct 29, 2018	Grant Deed, Transfer · Conventional Mortgage OPES ADVISORS

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Jun 20, 2025 · Amount on File
Deed Sale	Jun 20, 2025 · Amount on File
Prior Sale	Oct 29, 2018 · Amount on File
Deed Document Number	202516569
Prior Transfer Date	Apr 23, 2020
Prior Transfer Doc	0000016638
Record Updated	Oct 29, 2026

April 2020: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	MARIN CA
Recording Date	Apr 28, 2020
Property Address	308 SHEFFIELD AVE, MILL VALLEY, CA 94941-3860
Document Number	0000016638
Map Reference	VOL 4 PG 99
Instrument Date	Apr 23, 2020
Instrument	2020-0016638
Transaction Type	Transfer
Record Updated	Aug 13, 2021
Title Company	OLD REPUBLIC TITLE COMPANY

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	Community Property with Right of Survivorship
Address	308 SHEFFIELD AVE, MILL VALLEY, CA 94941-3860

Mortgage

Document Number	0000016639
Date	Apr 28, 2020
Instrument	2020-0016639

Lender

Name	FLAGSTAR BANK FSB
Type	Bank

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	May 1, 2050

October 2018: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	MARIN CA
Recording Date	Oct 29, 2018
Property Address	308 SHEFFIELD AVE, MILL VALLEY, CA 94941-3860
Document Number	0000037467
Instrument Date	Oct 17, 2018
Instrument	37467
Transaction Type	Transfer
Record Updated	Nov 9, 2018
Title Company	FIDELITY NATIONAL TITLE

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$1,428.90
Amount Accuracy	Full Value
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Community Property
Address	308 SHEFFIELD AVE MILL VALLEY CA 949413860, MILL VALLEY, CA 94941-3860

Mortgage

Document Number	37468
Date	Oct 29, 2018
Instrument	37468

Lender

Name	OPES ADVISORS
Address	TROY, MI 48098

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	360 Months
Due	Oct 28, 2048

Tax Assessment & Valuation

The 2025 property tax bill for 308 Sheffield Ave was $21,884.

Source: Marin County assessment roll, as of July 13, 2026

Property Jurisdictions

Type	Name
State	California
County	Marin County
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		$1,734,000 (+19.67%) Land $1,020,000 Building $714,000
2025	$21,884.00	$1,449,034 Land $668,184 Building $780,850
2023	$20,758.00 (+3.28%) Homeowner's exemption	$1,392,774 Land $642,241 Building $750,533
2022	$20,099.00

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

Flood

FEMA maps place 308 Sheffield Ave in Zone X, an area of minimal flood risk, though there have been 4 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
Community Rating System	Class 6 (20% premium discount)
Nearby Flood Policies	4 in force
Nearby Flood Claims	4 (1982–1998)
Claims Outside the SFHA	4 of 4
Most Recent Claim	Apr 1998 · Severe Winter Storms And Flooding

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 308 Sheffield Ave 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	Direct burnable vegetation

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 707 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
AT&T Fiber · DSL	5,000 / 5,000
Xfinity Cable	2,000 / 250
Unwired Fixed Wireless	300 / 25

May also be available: T-Mobile, Verizon.

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