42 Topside Way, Mill Valley, CA 94941 Property Records

Marin County property record for 42 Topside Way, Mill Valley, CA 94941

Property Summary

Property Type	Single Family Home
Details	4 bd · 3.5 ba · 4,018 sqft · built 1977
Lot Size	0.355 acres (15,440 sqft)
Owner	2 Company Names on File
Last Sale	$2,270,000 (Jun 2011)
Tax Bill	$40,738 (2025)
Flood Zone	Zone X (minimal risk)
APN	`043-122-18`

Property Details

APN / Parcel Number

Primary APN	`043-122-18`

Interior

Bedrooms	4 Beds
Full Baths	3.5 Baths
Half Baths	1 Half Bath
Total Rooms	10 Rooms
Stories	2 Stories
Building Area	4,018 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1977
Effective Year Built	Effective 2002
Architectural Style	Contemporary
Exterior Material	Wood Siding
Construction Type	Frame
Roof Material	Wood Shingle
Lot Area	15,440 sqft (0.355 acres)
Garage Area	638 sqft
Parking Spaces	2 Parking Spaces
Deck Area	1,022 sqft
Patio Area	1,022 sqft

Utilities, Heating & Cooling

Heating System	Central
Heating Fuel	Gas
Sewer	Municipal
Water Source	Commercial

Location & Zoning

Street Address	42 TOPSIDE WAY
City	MILL VALLEY
State	CA
Zip	94941-3212
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1
Legal Description	LOT 89
Legal Subdivision	HARBOR POINT 02B
Legal Lot Number	89
Jurisdiction	MARIN CA
Township / Civil Division	SOUTHEAST MARIN
Census Block Group	1
Census Block	1003
Census Tract	125000

Owner

Source: Marin County records · APN 043-122-18

Assessment roll updated July 13, 2026 · Last verified July 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 File
Mailing Address	42 TOPSIDE WAY, MILL VALLEY, CA 94941-3212
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust, Family Trust

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Verified Names on Deed
Last Sale	Jun 03, 2011 · Amount on Record
Deed Sale	Jun 03, 2011 · Amount on Record
Prior Sale	Jan 18, 2006 · Amount on Record
Deed Document Number	201128177
Last Transfer Date	Sep 01, 2011
Transfer Doc	0000044375
Record Updated	Sep 20, 2026

Tax Assessment & Valuation

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

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

Year	Tax Bill	Assessed Value
2026		$3,363,975 (+2%) Land $1,764,072 Building $1,599,903
2025	$40,738.00 (+5.24%) Homeowner's exemption	$3,298,021 (+4.04%) Land $1,729,485 Building $1,568,536
2023	$38,711.00 (+5.56%) Homeowner's exemption	$3,169,995 Land $1,662,349 Building $1,507,646
2022	$36,671.00

Flood & Wildfire

Source: FEMA National Flood Hazard Layer as of October 18, 2023 · FEMA NFIP claims and policies as of September 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 2026

Flood

FEMA Flood Zone	Zone X minimal risk
Nearest Special Flood Hazard Area	Zone VE, within 500 ft
Flood Insurance Requirement	Not required lenders may require it
Flood Insurance Cost	Premium on Record median of 29 individual policies
Community Rating System	Class 6 (20% premium discount)
Nearby Flood Policies	81 units insured incl. 52 condo units
Nearby Flood Claims	24 (1978–2014)
Claims Outside the SFHA	2 of 24
Most Recent Claim	Dec 2014 · rainfall accumulation
Claims by Event	Severe Winter Storms And Flooding, Mar 1998 · 3 claims Coastal Storms, Floods, Slides & Tornadoes, Feb 1983 · 4 claims Severe Storms, Flood, Mudslides & High Tide, Jan 1982 · 2 claims

Wildfire

Wildfire Risk	Low lower than 99.8% of the US · lower than 99.8% of California
Wildfire Likelihood	Under 0.01% annual chance
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 as of December 31, 2025 · Last verified October 2026

Provider	Max Down / Up (Mbps)
Xfinity Cable	2,000 / 250
Unwired Fixed Wireless	300 / 25
Verizon Fixed Wireless	300 / 20
Etheric Communications, LLC. Fixed Wireless	250 / 100

May also be available: T-Mobile USA.

Based on FCC filings for 185 locations within half a mile of this property.

Cell Coverage

5G (outdoors only) and 4G LTE

Drinking Water

Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026

Water System	MARIN MUNICIPAL WATER DISTRICT serves 188,116 people
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 as reported to EPA, 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. The full violation and enforcement history is in the system's EPA record.