21 William St, Cotati, CA 94931 Property Records

Sonoma County property record for 21 William St, Cotati, CA 94931 · Last verified April 2026

Property Highlights

Property Type	Public Works > Public School (Administration, Campus, Dorns, Instruction)
Bedrooms	3 Beds
Bathrooms	1 Baths
Architecture Style	Custom Design
Year Built	Built 1945
Square Footage	1,304 sqft Gross Area
Lot Size	11,233 sqft (0.258 acres)
Garage	Carport, 280 sqft
Tax Bill	$3,119.00 (2025)

Property Details

APN / Parcel Number

Primary APN	`144-200-013-000`
Alternative APN	`144-200-013`

Interior

Bedrooms	3 Beds
Full Baths	1 Baths
Total Rooms	3 Rooms
Units	2 Units
Building Area	1,304 sqft Gross Area
1st Floor	1,304 sqft 1st Floor
Stories	1 Stories

Exterior

Year Built	Built 1945
Effective Year Built	Effective 1945
Architectural Style	Custom Design Style
Construction Type	Wood Construction
Lot Area	11,233 sqft (0.258 acres)
Parking Spaces	1 Parking Spaces
Garage Type	Carport Garage
Garage Area	280 sqft Garage
Carport	Carport
Carport Area	280 sqft Carport

Utilities and HVAC

Cooling System	None Cooling

Location & Zoning

Old Parcel Number	144-200-013
Street Address	21 WILLIAM ST
City	COTATI
State	CA
Zip	94931-4235
Property Usage	Land which may be one of the following: Public spaces (i.e. parks and beaches), public buildings (i.e. schools, hospitals, courthouse), public services (i.e. water treatment, electrical grid/product, dams) Property Usage
Type	Public Works > Public School (Administration, Campus, Dorns, Instruction)
Legal Description	79 FORM 144-200-07 & PT TO 14 PM 48
Legal Subdivision	COTATI PRCL MAP 48
Legal Block	3
Legal Lot Number	1
Jurisdiction	SONOMA CA
Minor Civil Division	PETALUMA
Census Blockgroup	3
Census Block	3002
Census Tract	151204

Owner

Source: Sonoma County records · APN 144-200-013-000

Assessment roll updated April 13, 2026 · Last verified April 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 File
Mailing Address	173 NELSON WAY, SEBASTOPOL, CA 95472-3652
Owner Type	Owner is a Company
Vesting	Owner is a Trust, Trust

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	Verified Name on Deed
Last Transfer Date	Aug 23, 2018
Transfer Doc	0000060799
Record Refreshed	Jun 08, 2026

August 2018: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	SONOMA CA
Recording Date	Aug 28, 2018
Property Address	21 WILLIAM ST, COTATI, CA 94931-4235
Document Number	0000060799
Instrument Date	Aug 23, 2018
Instrument	60799
Transaction Type	Transfer
Record Updated	Sep 13, 2018
Title Company	ATTORNEY ONLY

Transaction

Tax	$0.00
Additional	Quitclaim Document Interfamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Revocable Trust
Address	173 NELSON WAY SEBASTOPOL CA 954723652, SEBASTOPOL, CA 95472-3652

Tax Assessment & Valuation

Source: Sonoma County records · Assessment roll updated April 13, 2026 · Last verified April 2026

Property Jurisdictions

Type	Name
State	California
County	Sonoma County
Municipality	Cotati City
Unified School District	Cotati-Rohnert Park Unified School District (KG - 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
2025	$3,119.00 (+3.11%)	$232,828 (+4.04%) Land $73,957 Building $158,871
2023	$3,025.00 (+1.82%)	$223,788 Land $71,086 Building $152,702
2022	$2,971.00

Flood & Wildfire

21 William St is in FEMA Zone X, outside the Special Flood Hazard Area, with no wildfire exposure.

Flood

Source: FEMA National Flood Hazard Layer · Sonoma County (06097C), updated February 15, 2026

FEMA Flood Zone	Zone X minimal flood hazard · outside the 0.2% annual chance floodplain
Special Flood Hazard Area	No

Wildfire

Source: USDA Forest Service Wildfire Risk to Communities · 2nd edition (2024), fuels as of 2020

Wildfire Risk to Homes	Not rated no burnable land in reach
Wildfire Likelihood	Negligible
Exposure	None beyond ember reach of burnable land

Values are read at the parcel center point; lenders make the official flood determination.