523 Hillside Ave, Mill Valley, CA 94941 Property Records

Marin County property record for 523 Hillside Ave, Mill Valley, CA 94941

Property Summary

Property Type	Single Family Home
Details	5 bd · 4.5 ba · 4,843 sqft · built 1929
Lot Size	0.826 acres (36,000 sqft)
Owner	2 Company Names on Record
Last Sale	$2,100,000 (Feb 2011)
Tax Bill	$49,646 (2025)
Deeds & Mortgages	May 2023 Line of Credit Dec 2021 Mortgage + 2 more
Flood Zone	Zone X (minimal risk)
APN	`029-081-03`

Property Details

APN / Parcel Number

Primary APN	`029-081-03`

Interior

Bedrooms	5 Beds
Full Baths	4.5 Baths
Half Baths	1 Half Bath
Total Rooms	5 Rooms
Building Area	4,843 sqft Living Area
Basement Area	254 sqft
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1929
Effective Year Built	Effective 2005
Architectural Style	Contemporary
Lot Area	36,000 sqft (0.826 acres)
Garage Area	454 sqft
Parking Spaces	2 Parking Spaces
Deck Area	1,678 sqft
Patio Area	1,678 sqft

Utilities, Heating & Cooling

Heating System	Central

Location & Zoning

Street Address	523 HILLSIDE AVE
City	MILL VALLEY
State	CA
Zip	94941-1160
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	MAP E2 606
Legal Subdivision	BOLSA VLY MAP #2
Legal Lot Number	41-45
Jurisdiction	MARIN CA
Township / Civil Division	SOUTHEAST MARIN
Census Block Group	5
Census Block	5019
Census Tract	126100

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	2 Company Names on Record
Mailing Address	523 HILLSIDE AVE, MILL VALLEY, CA 94941-1160
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Borrower in Default

Deeds, Mortgages & Sale History

Date	Document
May 26, 2023	Deed of Trust, Mortgage · Line of Credit US BANK NA
Dec 15, 2021	Deed of Trust, Mortgage · Conventional Mortgage FIRST REPUBLIC BANK
Oct 3, 2017	Deed of Trust, Mortgage · ARM FIRST REPUBLIC BANK
Apr 23, 2019	Deed of Trust, Mortgage · Line of Credit MUFG UNION BANK NA

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Feb 25, 2011 · Amount on Record
Deed Sale	Feb 25, 2011 · Amount on Record
Deed Document Number	201111740
Prior Transfer Date	Mar 3, 2000
Prior Transfer Doc	0000014247
Record Updated	Oct 29, 2026

May 2023: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	523 HILLSIDE AVE, MILL VALLEY, CA 94941-1160
Transaction Type	Mortgage
Record Updated	Jun 7, 2023
Title Company	RADIAN SETTLEMENT SERVICES INC, RADIAN SETTLEMENT SVCS INC

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	523 HILLSIDE AVE, MILL VALLEY, CA 94941-1160

Mortgage

Document Number	0000013330
Date	May 26, 2023
Instrument	2023-0013330

Lender

Name	US BANK NA
Type	Bank
Address	CINCINNATI, OH 45202

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	360 Months
Due	May 23, 2053

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

December 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	523 HILLSIDE AVE, MILL VALLEY, CA 94941-1160
Transaction Type	Mortgage
Record Updated	Dec 28, 2021
Title Company	FIDELITY NATIONAL TITLE, FIDELITY NATIONAL TITLE CO

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	523 HILLSIDE AVE, MILL VALLEY, CA 94941-1160

Mortgage

Document Number	0000073183
Date	Dec 15, 2021
Instrument	2021-0073183

Lender

Name	FIRST REPUBLIC BANK
Type	Bank
Address	SAN FRANCISCO, CA 94111

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Jan 1, 2052

Interest

Rate Type	Adjustable Rate
Rate	2.95%
Type Change Date	Jan 1, 2032
Change Frequency	Monthly
Min Rate At Change	2.95%
Max Rate At Change	10.9%
Index	Other
Max Rate	10.9%

October 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	523 HILLSIDE AVE, MILL VALLEY, CA 94941-1160
Transaction Type	Mortgage
Record Updated	Feb 5, 2021

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000039357
Date	Oct 3, 2017
Instrument	2017-0039357

Lender

Name	FIRST REPUBLIC BANK
Type	Bank
Address	SAN FRANCISCO, CA 94111

Agreement

Type	ARM
Amount	Amount Recorded
Term	360 Months
Due	Oct 1, 2047

Interest

Rate Type	Adjustable Rate
Rate	2.95%
Type Change Date	Dec 1, 2022
Change Frequency	Annually
Min Rate At Change	2.5%
Max Rate At Change	9.95%
Index	1-Month LIBOR

April 2019: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	523 HILLSIDE AVE, MILL VALLEY, CA 94941-1160
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	CHICAGO TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000013349
Date	Apr 23, 2019
Instrument	2019-0013349

Lender

Name	MUFG UNION BANK NA
Type	Bank
Address	SAN DIEGO, CA 92121

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	361 Months
Due	May 1, 2049

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

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		$3,414,256 (+2%) Land $1,306,720 Building $2,107,536
2025	$49,646.00 (+8.61%) Homeowner's exemption	$3,347,319 (+4.04%) Land $1,281,100 Building $2,066,219
2023	$45,709.00 (+2.87%) Homeowner's exemption	$3,217,379 Land $1,231,370 Building $1,986,009
2022	$44,434.00

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
Nearby Flood Policies	1 in force
Nearby Flood Claims	3 (1986–2010)
Claims Outside the SFHA	2 of 3
Most Recent Claim	Jan 2010 · 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

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

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

May also be available: T-Mobile, Verizon.

Cell Coverage

5G (outdoors only) and 4G LTE

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