---
listing_id: BA326082579
status: Active
price: 5195000
beds: 5
baths_full: 6
baths_half: 0
sqft_living: 4818
sqft_lot: 20007
lot_acres: 0.459
year_built: 1998
property_type: Residential
property_subtype: Single Family Residence
address: "645 William Cunningham Ave"
city: Sonoma
state: CA
zip: 95476
county: "Sonoma County"
lat: 38.2878666
lng: -122.4457298
days_on_market: 16
hoa_fee: 
hoa_frequency: 
garage_spaces: 3
list_agent: "Mary Ryan"
list_office: "Engel & Volkers Sonoma"
list_agent_phone: "(510) 339-8710"
list_agent_license: 02031683
mls_source: REBAREIS
modified: 2026-10-14
transaction_type: buy
---

Home | Sonoma County | Sonoma | 95476 | 645 William Cunningham Ave

645 William Cunningham Ave, Sonoma, CA 95476

MLS: BA326082579 | Status: Active | Price: $5,195,000
Beds/Baths: 5 / 6
Property Type: Residential

Quick Facts

Beds Baths Sq Ft Acres Lot Yr Built
5 6 4,818 0.459 1998

Remarks

This 4-bedroom, 4-bath main residence pairs period character with modern comfort. Craftsman details, timeless proportions, and a warm, livable floor plan carry throughout the approximately 4,818 sq ft main residence. The grounds are just as special. Mature landscaping surrounds the in-ground pool, creating a private setting for afternoons outdoors, entertaining, and relaxed Sonoma living. The 3-car garage includes a convenient shower room, ideal for pool days, gardening, or a quick post-workout rinse. Above the garage, an approximately 825 sq ft carriage house offers a simple, private escape for guests, a home office, or studio. Just five blocks from Sonoma Plaza, the property is close to boutiques, tasting rooms, Michelin-starred and acclaimed restaurants, and the heart of downtown Sonoma. With approximately 4,018 sq ft in the main house plus an additional 825 sq ft carriage house and a total of 6 full bathrooms, this is a rare opportunity to own a remarkable piece of Sonoma's architectural heritage.

MLS Listing Information

Field Value
MLS # BA326082579
MLS Source Bay Area Real Estate Information Services, Inc.
Days on Site 16

Features

Interior Features

Feature Details
Fireplace Gas Log, Gas Starter, Stone
Laundry In Laundry Room
Cooling Central Forced Air
Heating Central Forced Air, Fireplace

Exterior Features

Feature Details
Pool Heated - Solar, In Ground, Pool - Yes
Style Custom

Parking, School, and Other Information

Feature Details
Garage/Parking 24'+ Deep Garage, Detached, Garage: 3 Car(s)
Sewer Public Sewer
Water Public

Contact Information

Mary Ryan
Engel & Volkers Sonoma
License #: 02031683
Phone: (510) 339-8710

Property Units

# Buildings # Leased Units # Total Units
0 – –

School Ratings

School data provided by GreatSchools.org

Nearby Schools

School Type Grades Distance Rating
Prestwood Elementary School public K-5 0.50 mi 5
Creekside High School public 9-12 0.76 mi 1
Sonoma Valley High School public 9-12 0.76 mi 7
Adele Harrison Middle School public 6-8 0.89 mi 4
Sassarini Elementary School public K-5 1.22 mi 3
El Verano Elementary School public K-5 2.49 mi 4
Flowery Elementary School public K-5 3.13 mi 5
Altimira Middle School public 6-8 3.25 mi 2

Nearby Homes

Address Price Beds Baths Sq Ft Status
3525 Wood Valley Rd $5,995,000 5 4/1 4,912 PendingDoNotShow
1590 N Castle Rd $5,700,000 2 2/1 3,376 Active
855 Grapestone Ln $5,995,000 3 3/1 3,313 Active
3003 Castle Rd $5,995,000 3 4/2 7,631 Active

Disclosures

©2026 Bay Area Real Estate Information Services, Inc. All rights reserved. All data, including all measurements and calculations of area, is obtained from various sources and has not been, and will not be, verified by broker or MLS. All information should be independently reviewed and verified for accuracy. Properties may or may not be listed by the office/agent presenting the information. Information provided is for personal, non-commercial use by the viewer and may not be redistributed without explicit authorization from Bay Area Real Estate Information Services, Inc.

Presently MLSListings.com displays Active, Contingent, Pending, and Recently Sold listings. Recently Sold listings are properties which were sold within the last three years. After that period listings are no longer displayed in MLSListings.com. Pending listings are properties under contract and no longer available for sale. Contingent listings are properties where there is an accepted offer, and seller may be seeking back-up offers. Active listings are available for sale.

This listing information is up-to-date as of October 14, 2026. For the most current information, please contact Mary Ryan, (510) 339-8710.