583 Throckmorton Ave, Mill Valley, CA 94941 Property Records

Marin County property record for 583 Throckmorton Ave, Mill Valley, CA 94941

Property Summary

Property Type	Single Family Home
Details	3 bd · 3 ba · 3,191 sqft · built 1949
Lot Size	0.248 acres (10,800 sqft)
Owner	2 Company Names on File
Last Sale	$690,000 (May 1998)
Tax Bill	$26,850 (2025)
Deeds & Mortgages	Jun 2021 Line of Credit Oct 2017 Line of Credit + 2 more
Flood Zone	Zone X (minimal risk)
APN	`027-171-05`

Property Details

APN / Parcel Number

Primary APN	`027-171-05`

Interior

Bedrooms	3 Beds
Full Baths	3 Baths
Total Rooms	5 Rooms
Stories	1 Story
Building Area	3,191 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1949
Effective Year Built	Effective 1989
Architectural Style	Contemporary
Lot Area	10,800 sqft (0.248 acres)
Garage Area	473 sqft
Parking Spaces	2 Parking Spaces
Deck Area	222 sqft
Patio Area	222 sqft

Utilities, Heating & Cooling

Heating System	Central

Location & Zoning

Street Address	583 THROCKMORTON AVE
City	MILL VALLEY
State	CA
Zip	94941-1734
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Subdivision	TAMALPAIS LAND & WATER CO MAP
Legal Lot Number	185
Jurisdiction	MARIN CA
Township / Civil Division	SOUTHEAST MARIN
Census Block Group	4
Census Block	4003
Census Tract	127000

Owner

583 Throckmorton Ave is owned by a company that acquired it in December 1999 and is owner-occupied.

Source: Marin County records, as of August 27, 2026

Owner of Record	2 Company Names on File
Mailing Address	583 THROCKMORTON AVE, MILL VALLEY, CA 94941-1734
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Borrower 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

Date	Document
Jun 14, 2021	Deed of Trust, Mortgage · Line of Credit JPMORGAN CHASE BANK NA
Oct 25, 2017	Deed of Trust, Mortgage · Line of Credit FIRST REPUBLIC BANK
Oct 25, 2017	Deed of Trust, Mortgage · ARM FIRST REPUBLIC BANK
Jan 28, 2020	Deed of Trust, Mortgage · Conventional Mortgage JPMORGAN CHASE BANK NA

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	May 5, 1998 · Amount on File
Deed Sale	May 5, 1998 · Amount on File
Deed Document Number	199829760
Last Transfer Date	Dec 23, 1999
Transfer Doc	0000000584
Record Updated	Oct 29, 2026

June 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	583 THROCKMORTON AVE, MILL VALLEY, CA 94941-1734
Transaction Type	Mortgage
Record Updated	Jul 7, 2021
Title Company	REPUBLIC NATIONAL TITLE INSURANCE COMPANY, OLD REPUBLIC NATL TTL INS CO

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	583 THROCKMORTON AVE, MILL VALLEY, CA 94941-1734

Mortgage

Document Number	0000039106
Date	Jun 14, 2021
Instrument	2021-0039106

Lender

Name	JPMORGAN CHASE BANK NA
Type	Bank
Address	DOWNERS GROVE, IL 60515

Agreement

Type	Line of Credit
Amount	Amount on Record
Term	361 Months
Due	Jul 5, 2051

October 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	583 THROCKMORTON AVE, MILL VALLEY, CA 94941-1734
Transaction Type	Mortgage
Record Updated	Feb 7, 2021
Title Company	OLD REPUBLIC TITLE CO

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000042297
Date	Oct 25, 2017
Instrument	2017-0042297

Lender

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

Agreement

Type	Line of Credit
Amount	Amount on Record
Term	300 Months
Due	Oct 26, 2042

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

October 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	583 THROCKMORTON AVE, MILL VALLEY, CA 94941-1734
Transaction Type	Mortgage
Record Updated	Feb 7, 2021
Title Company	OLD REPUBLIC TITLE CO

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000042296
Date	Oct 25, 2017
Instrument	2017-0042296

Lender

Name	FIRST REPUBLIC BANK
Type	Bank
Address	SAN FRANCISCO, CA 94108

Agreement

Type	ARM
Amount	Amount on Record
Term	361 Months
Due	Nov 1, 2047

Interest

Rate Type	Adjustable Rate
Rate	2.75%
Type Change Date	Nov 1, 2024
Change Frequency	Annually
Min Rate At Change	2.5%
Max Rate At Change	9.95%
Index	1-Year LIBOR

January 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	MARIN CA
Property Address	583 THROCKMORTON AVE, MILL VALLEY, CA 94941-1734
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	OLD REPUBLIC TITLE INS CO

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000003474
Date	Jan 28, 2020
Instrument	2020-0003474

Lender

Name	JPMORGAN CHASE BANK NA
Type	Bank
Address	WESTMONT, IL 60559

Agreement

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

Interest

Rate Type	Adjustable Rate
Rate	2.87%
Type Change Date	Feb 1, 2027
Change Frequency	Annually
Min Rate At Change	2.25%
Max Rate At Change	4.87%
Index	1-Year LIBOR
Max Rate	7.87%

Tax Assessment & Valuation

The 2025 property tax bill for 583 Throckmorton Ave was $26,850 with a homeowner's exemption.

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		$2,038,916 (+2%) Land $732,861 Building $1,306,055
2025	$26,850.00 Homeowner's exemption	$1,998,941 Land $718,492 Building $1,280,449
2023	$26,610.00 (+7.71%) Homeowner's exemption	$1,921,335 Land $690,597 Building $1,230,738
2022	$24,705.00

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

Flood

FEMA maps place 583 Throckmorton 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 Zone	Zone X minimal risk
Nearest Special Flood Hazard Area	Zone AE, within 500 ft
Flood Insurance Requirement	Not required lenders may require it
Flood Insurance Cost	Premium on File median of 10 policies
Nearby Flood Policies	10 in force
Nearby Flood Claims	2 (2005–2007)
Claims Outside the SFHA	1 of 2
Most Recent Claim	May 2007 · other causes

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 583 Throckmorton Ave is moderate, ranking above 40% of the US, with a 0.07% annual chance of wildfire.

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

Wildfire Risk	Moderate above 40% of the US · lower than 76% of California
Wildfire Likelihood	0.07% annual chance
Exposure	Indirect within ember reach
Adjoins Burnable Land	Yes

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

Provider	Max 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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