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850 Donner Ave, Sonoma, CA 95476 Property Records

Sonoma County property record for 850 Donner Ave, Sonoma, CA 95476

Property Summary

Property TypeSingle Family Home
Details3 bd · 2.5 ba · 1,888 sqft · built 1948
Lot Size0.43 acres (18,750 sqft)
OwnerCompany Name on Record
Last Sale$810,000 (Nov 2002)
Tax Bill$15,138 (2025)
Deeds & MortgagesFeb 2022 Line of Credit
Jan 2021 Mortgage
Flood ZoneZone X (moderate risk)
APN018-363-017-000

Property Details

APN / Parcel Number

Primary APN018-363-017-000
Alternative APN
  • 018-363-017

Interior

Bedrooms3 Beds
Full Baths2.5 Baths
Half Baths1 Half Bath
Total Rooms3 Rooms
Stories1 Story
Building Area1,888 sqft Living Area
Gross Area2,328 sqft
1st Floor Area1,888 sqft
Fireplaces1 Fireplace
FireplaceFireplace

Exterior

Year BuiltBuilt 1948
Effective Year BuiltEffective 1990
Lot Area18,750 sqft (0.43 acres)
Garage TypeAttached
Garage Area440 sqft
Parking Spaces2 Parking Spaces

Location & Zoning

Old Parcel Number018-363-017
Street Address850 DONNER AVE
CitySONOMA
StateCA
Zip95476-7136
Property CategoryResidential
Property TypeResidential > Single Family > Home
Legal Description2003 FM PT 018-363-009
Legal SubdivisionGREENDALE
Legal Block1
Legal Lot Number26,27
JurisdictionSONOMA CA
Township / Civil DivisionSONOMA
Census Block Group1
Census Block1022
Census Tract150204

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 RecordCompany Name on Record
Mailing Address850 DONNER AVE, SONOMA, CA 95476-7136
OccupancyOwner Occupied
Owner TypeCompany
VestingTrust

Deeds, Mortgages & Sale History

DateDocument
Feb 10, 2022Deed of Trust, Mortgage · Line of Credit
FIRST REPUBLIC BANK
Jan 12, 2021Deed of Trust, Mortgage · Conventional Mortgage
FIRST REPUBLIC BANK

Assessor's Deed Record

Deed NamesName on Deed
Last SaleNov 1, 2002 · Amount on Record
Deed SaleNov 1, 2002 · Amount on Record
Deed Document Number2002169098
Last Transfer DateAug 19, 2003
Transfer Doc0000177824
Record UpdatedOct 29, 2026

February 2022: Deed of Trust, Mortgage

Document TypeDeed of Trust
JurisdictionSONOMA CA
Property Address850 DONNER AVE, SONOMA, CA 95476-7136
Transaction TypeMortgage
Record UpdatedFeb 24, 2022
Title CompanyOLD REPUBLIC TITLE, OLD REPUBLIC TITLE CO

Transferred To (Grantee/Buyer)

NameVerified Name
Address850 DONNER AVE, SONOMA, CA 95476-7136

Mortgage

Document Number0000010009
DateFeb 10, 2022
Instrument2022010009
Lender
NameFIRST REPUBLIC BANK
TypeBank
AddressSAN FRANCISCO, CA 94111
Agreement
TypeLine of Credit
AmountAmount Recorded
Term300 Months
DueFeb 26, 2047
Interest
Rate TypeAdjustable Rate
Change FrequencyMonthly

January 2021: Deed of Trust, Mortgage

Document TypeDeed of Trust
JurisdictionSONOMA CA
Property Address850 DONNER AVE, SONOMA, CA 95476-7136
Transaction TypeMortgage
Record UpdatedFeb 5, 2021
Title CompanyOLD REPUBLIC TITLE

Transferred To (Grantee/Buyer)

NameVerified Name
Address850 DONNER AVE, SONOMA, CA 95476-7136

Mortgage

Document Number0000003506
DateJan 12, 2021
Instrument2021003506
Lender
NameFIRST REPUBLIC BANK
TypeBank
AddressSAN FRANCISCO, CA 94111
Agreement
TypeConventional Mortgage
AmountAmount Recorded
Term361 Months
DueFeb 1, 2051

Tax Assessment & Valuation

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

Property Jurisdictions

TypeName
StateCalifornia
CountySonoma County
MunicipalitySonoma City
Unified School DistrictSonoma Valley Unified School District (KG - 12)

Tax Bill & Assessment History

YearTax BillAssessed Value
2026$1,231,445 (+2%) Land $768,215 Building $463,230
2025$15,138.00 (+5.06%) Homeowner's exemption$1,207,300 (+4.04%) Land $753,152 Building $454,148
2023$14,409.00 (+0.35%) Homeowner's exemption$1,160,421 Land $723,907 Building $436,514
2022$14,359.00

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 ZoneZone X
moderate risk
500-Year FloodplainYes
0.2% annual chance
Flood Insurance RequirementNot required
lenders may require it
Flood Insurance CostPremium on Record
median of 15 policies
Nearby Flood Policies15 in force
Nearby Flood Claims8 (1978–2025)
Claims Outside the SFHA6 of 8
Most Recent ClaimFeb 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 RiskLow
lower than 80% of the US · lower than 88% of California
Wildfire Likelihood0.01% annual chance
ExposureNone
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 SystemCITY OF SONOMA
serves 10,619 people · EPA ID CA4910012
Water SourceGroundwater
Last State InspectionJul 2024
LeadUnder 1 ppb (2021–2023)
action level 15 ppb

Violations Reported to EPA

Water QualityNone
last 10 years
Treatment and ProcedureNone
last 10 years
Monitoring and Reporting1
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 546 locations within half a mile, as of December 31, 2025

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

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