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21 Marion Ave, Mill Valley, CA 94941 Property Records

Marin County property record for 21 Marion Ave, Mill Valley, CA 94941

Property Summary

Property TypeSingle Family Home
Details5 bd · 3.5 ba · 2,842 sqft · built 1960
Lot Size0.096 acres (4,183 sqft)
Owner2 Company Names on File
Last Sale$795,000 (May 2000)
Tax Bill$17,714 (2025)
Deeds & MortgagesJul 2023 Mortgage
Flood ZoneZone X (minimal risk)
APN027-243-22

Property Details

APN / Parcel Number

Primary APN027-243-22

Interior

Bedrooms5 Beds
Full Baths3.5 Baths
Half Baths1 Half Bath
Total Rooms9 Rooms
Stories2 Stories
Building Area2,842 sqft Living Area
Basement Area238 sqft
Fireplaces1 Fireplace
FireplaceFireplace

Exterior

Year BuiltBuilt 1960
Effective Year BuiltEffective 1962
Architectural StyleContemporary
Lot Area4,183 sqft (0.096 acres)
Garage Area280 sqft
Parking Spaces1 Parking Space
Deck Area832 sqft
Patio Area832 sqft

Utilities, Heating & Cooling

Heating SystemCentral

Location & Zoning

Street Address21 MARION AVE
CityMILL VALLEY
StateCA
Zip94941-1722
Property CategoryResidential
Property TypeResidential > Single Family > Home
Legal DescriptionLOT 19
Legal SubdivisionTAMALPAIS LAND & WATER CO MAP
Legal Lot Number19
JurisdictionMARIN CA
Township / Civil DivisionSOUTHEAST MARIN
Census Block Group3
Census Block3003
Census Tract127000

Historic Designation

Source: NPS National Register of Historic Places, as of August 1, 2026

Listed AreaWithin Dipsea Trail, The
listed 2010 · 1 contributing resources · NRIS 10000356

Federal listing alone does not restrict alterations; local historic district rules, which this data does not cover, may apply.

Owner

21 Marion Ave is owned by a company that acquired it in March 2011 and is owner-occupied.

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

Owner of Record2 Company Names on File
Mailing Address21 MARION AVE, MILL VALLEY, CA 94941-1722
OccupancyOwner Occupied
Owner TypeCompany
VestingBorrower in Default

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

Assessor's Deed Record

Deed Names2 Names on Deed
Last SaleMay 12, 2000 · Amount on File
Deed SaleMay 12, 2000 · Amount on File
Prior SaleNov 9, 1995 · Amount on File
Deed Document Number200024597
Last Transfer DateMar 29, 2011
Transfer Doc0000018841
Record UpdatedOct 29, 2026

July 2023: Deed of Trust, Mortgage

Document TypeDeed of Trust
JurisdictionMARIN CA
Property Address21 MARION AVE, MILL VALLEY, CA 94941-1722
Transaction TypeMortgage
Record UpdatedAug 16, 2023

Transferred To (Grantee/Buyer)

NameVerified Name
Address21 MARION AVE, MILL VALLEY, CA 94941-1722

Mortgage

Document Number0000018997
DateJul 31, 2023
Instrument2023-0018997
Lender
NameGUARANTEED RATE INC
TypeMortgage Company
AddressCHICAGO, IL 60613
Agreement
TypeConventional Mortgage
AmountAmount on Record
Term361 Months
DueAug 1, 2053

Tax Assessment & Valuation

The 2025 property tax bill for 21 Marion Ave was $17,714 with a homeowner's exemption.

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

Property Jurisdictions

TypeName
StateCalifornia
CountyMarin County
MunicipalityMill Valley City
Elementary School DistrictMill Valley Elementary School District (KG - 08)
Secondary School DistrictTamalpais Union High School District (09 - 12)

Tax Bill & Assessment History

YearTax BillAssessed Value
2026$1,246,249 (+2%) Land $837,892 Building $408,357
2025$17,714.00 Homeowner's exemption$1,221,818 Land $821,466 Building $400,352
2023$16,873.00 (+2.24%) Homeowner's exemption$1,174,381 Land $789,573 Building $384,808
2022$16,503.00

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

Flood

FEMA maps place 21 Marion Ave in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.

Source: FEMA National Flood Hazard Layer, effective October 18, 2023 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood ZoneZone X
minimal risk
Nearest Special Flood Hazard AreaZone AO, within 500 ft
Flood Insurance RequirementNot required
lenders may require it
Nearby Flood Policies5 in force
Nearby Flood Claims4 (1982–1998)
Claims Outside the SFHA3 of 4
Most Recent ClaimJan 1998 · rainfall accumulation

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 21 Marion Ave is moderate, ranking above 40% of the US, with a 0.06% annual chance of wildfire.

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire RiskModerate
above 40% of the US · lower than 76% of California
Wildfire Likelihood0.06% annual chance
ExposureDirect
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 SystemMARIN MUNICIPAL WATER DISTRICT
serves 188,116 people · EPA ID CA2110002
Water SourceSurface water
Last State InspectionAug 2023
LeadUnder 1 ppb (2019–2021)
action level 15 ppb

Violations Reported to EPA

Water QualityNone
last 10 years
Treatment and ProcedureNone
last 10 years
Monitoring and ReportingNone
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 340 locations within half a mile, as of December 31, 2025

ProviderMax Down / Up (Mbps)
AT&T
Fiber · DSL in parts of the area		5,000 / 5,000
Xfinity
Cable		2,000 / 250

May also be available: Unwired, Verizon.

Cell Coverage

5G and 4G LTE (outdoors only)

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