340 Patten St, Sonoma, CA 95476 Property Records

Sonoma County property record for 340 Patten St, Sonoma, CA 95476

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,326 sqft · built 1966
Lot Size	0.301 acres (13,125 sqft)
Owner	Company Name on Record
Last Sale	$310,000 (Jun 2010)
Tax Bill	$6,239 (2025)
Deeds & Mortgages	Jun 2023 Transfer
Flood Zone	Zone X (moderate risk)
APN	`018-271-033-000`

Property Details

APN / Parcel Number

Primary APN	`018-271-033-000`
Alternative APN	`018-271-033`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Total Rooms	3 Rooms
Stories	1 Story
Building Area	1,326 sqft Living Area
1st Floor Area	1,326 sqft
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1966
Effective Year Built	Effective 1966
Architectural Style	Custom Design
Exterior Material	Stucco
Construction Type	Wood
Roof Material	Composition Shingle
Lot Area	13,125 sqft (0.301 acres)
Garage Type	Detached
Garage Area	1,850 sqft

Utilities, Heating & Cooling

Cooling System	HVAC
Sewer	Municipal
Water Source	Commercial

Location & Zoning

Old Parcel Number	018-271-033
Street Address	340 PATTEN ST
City	SONOMA
State	CA
Zip	95476-6732
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1
Legal Description	LOT 273
Legal Subdivision	SONOMA
Legal Block	1
Legal Lot Number	273
Jurisdiction	SONOMA CA
Township / Civil Division	SONOMA
Census Block Group	1
Census Block	1000
Census Tract	150204

Historic Designation

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

Historic District	Within the Sonoma Plaza listed 1975 · 31 contributing resources · National Historic Landmark (designated 1960) · NRIS 75000489

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

Owner

Source: Sonoma County records, as of September 1, 2026

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record	Company Name on Record
Mailing Address	340 PATTEN ST, SONOMA, CA 95476-6732
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Jun 4, 2010 · Amount on Record
Deed Sale	Jun 4, 2010 · Amount on Record
Prior Sale	Jan 3, 1997 · Amount on Record
Deed Document Number	201045972
Last Transfer Date	Jun 14, 2023
Transfer Doc	0000028508
Record Updated	Oct 29, 2026

June 2023: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	SONOMA CA
Recording Date	Jun 26, 2023
Property Address	340 PATTEN ST, SONOMA, CA 95476-6732
Document Number	0000028508
Instrument Date	Jun 14, 2023
Instrument	2023028508
Transaction Type	Transfer
Record Updated	Jul 11, 2023

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
Address	340 PATTEN ST, SONOMA, CA 95476-6732

Tax Assessment & Valuation

Source: Sonoma County assessment roll, as of September 1, 2026

Property Jurisdictions

Type	Name
State	California
County	Sonoma County
Municipality	Sonoma City
Unified School District	Sonoma Valley Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$432,039 (+2%) Land $203,576 Building $228,463
2025	$6,239.00 (+5.25%) Homeowner's exemption	$423,569 (+4.04%) Land $199,585 Building $223,984
2023	$5,928.00 (+0.59%) Homeowner's exemption	$407,124 (+2%) Land $191,836 Building $215,288
2022	$5,893.00 Homeowner's exemption	$399,142 Land $188,075 Building $211,067

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

Flood

Source: FEMA National Flood Hazard Layer, effective February 15, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood Zone	Zone X moderate risk
500-Year Floodplain	Yes 0.2% annual chance
Nearest Special Flood Hazard Area	Zone AE, within 500 ft
Flood Insurance Requirement	Not required lenders may require it
Flood Insurance Cost	Premium on Record median of 15 policies
Nearby Flood Policies	15 in force
Nearby Flood Claims	8 (1978–2025)
Claims Outside the SFHA	6 of 8
Most Recent Claim	Feb 2025 · rainfall accumulation
Claims by Event	Severe Winter Storms, Flooding, Landslides, And Mudslides, Feb 2019 · 2 claims Severe Winter Storm, Mud & Land Slides, & Flooding, Jan 1993 · 2 claims

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 80% of the US · lower than 88% of California
Wildfire Likelihood	0.01% annual chance
Exposure	None beyond ember reach

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	CITY OF SONOMA serves 10,619 people · EPA ID CA4910012
Water Source	Groundwater
Last State Inspection	Jul 2024
Lead	Under 1 ppb (2021–2023) action level 15 ppb

Violations Reported to EPA

Water Quality	None last 10 years
Treatment and Procedure	None last 10 years
Monitoring and Reporting	1 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.

Internet Providers

Source: FCC Broadband Data Collection, based on 579 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Xfinity Cable	2,000 / 250
Verizon Fixed Wireless	300 / 20
T-Mobile Fixed Wireless	100 / 20
AT&T DSL · Fiber, Fixed Wireless in parts of the area	100 / 20