# 645 William Cunningham Avenue, Sonoma, CA 95476

> **TL;DR:** 5bd/6ba single family, $5,650,000 ($1173/sqft), built 1998, 4,818 sqft. Est. $30,217/mo.

## Property at a Glance

| Attribute | Value |
|-----------|-------|
| Price | $5,650,000 |
| Price/sqft | $1173 |
| Bedrooms | 5 |
| Bathrooms | 6 full |
| Square Feet | 4,818 |
| Year Built | 1998 |
| Property Type | Single Family (Single Family Residence) |
| Status | Active |
| Days on Market | 0 |

## Estimated Monthly Costs

| Category | Amount |
|----------|--------|
| Principal & Interest (20% down, 30-year at 6.5%) | $28,569 |
| Estimated Insurance | $1,648 |
| **Total** | **$30,217** |

## Property Highlights

- Built in 1998

## Description

### Agent Description
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.

## Location

- **Address:** 645 William Cunningham Avenue, Sonoma, CA 95476
- **County:** Sonoma
- **Coordinates:** 38.28786, -122.445727
- **Google Maps:** https://www.google.com/maps?q=38.28786,-122.445727

## Listing Agent

- **Name:** Mary A Ryan
- **Brokerage:** Engel & Volkers Sonoma
- **Broker Phone:** 7077083087

## Photos

![645 William Cunningham Avenue - Photo 1](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f3521446113r.jpg)

![645 William Cunningham Avenue - Photo 2](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f2013571862r.jpg)

![645 William Cunningham Avenue - Photo 3](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f3548868154r.jpg)

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![645 William Cunningham Avenue - Photo 5](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f2612487886r.jpg)

![645 William Cunningham Avenue - Photo 6](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f3527739142r.jpg)

![645 William Cunningham Avenue - Photo 7](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f999217692r.jpg)

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![645 William Cunningham Avenue - Photo 29](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f207742266r.jpg)

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![645 William Cunningham Avenue - Photo 33](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f3966335645r.jpg)

![645 William Cunningham Avenue - Photo 34](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f2948581542r.jpg)

![645 William Cunningham Avenue - Photo 35](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f2759888036r.jpg)

![645 William Cunningham Avenue - Photo 36](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f3494476577r.jpg)

![645 William Cunningham Avenue - Photo 37](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f3933621971r.jpg)

![645 William Cunningham Avenue - Photo 38](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f3187212875r.jpg)

![645 William Cunningham Avenue - Photo 39](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f893835852r.jpg)

![645 William Cunningham Avenue - Photo 40](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f2522770205r.jpg)

![645 William Cunningham Avenue - Photo 41](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f4019109404r.jpg)

![645 William Cunningham Avenue - Photo 42](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f1769926092r.jpg)

![645 William Cunningham Avenue - Photo 43](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f2465163159r.jpg)

![645 William Cunningham Avenue - Photo 44](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f3308477009r.jpg)

![645 William Cunningham Avenue - Photo 45](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f2059977113r.jpg)

![645 William Cunningham Avenue - Photo 46](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f1607378631r.jpg)

![645 William Cunningham Avenue - Photo 47](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f3209597746r.jpg)

![645 William Cunningham Avenue - Photo 48](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f3758235134r.jpg)

![645 William Cunningham Avenue - Photo 49](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f1017241012r.jpg)

![645 William Cunningham Avenue - Photo 50](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f655720820r.jpg)

![645 William Cunningham Avenue - Photo 51](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f644904266r.jpg)

![645 William Cunningham Avenue - Photo 52](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f13135556r.jpg)

![645 William Cunningham Avenue - Photo 53](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f2411264814r.jpg)

![645 William Cunningham Avenue - Photo 54](http://lh.rdcpix.com/1a3255056a882738d065faab3585b2e6l-f1034876600r.jpg)

---

**MLS#:** 326082579 | **Updated:** 2026-10-01
**Source:** listhub

*Copyright © 2026 Engel & Völkers. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.*

[View on PropertySimple](https://www.propertysimple.ai/listing/645-william-cunningham-avenue-sonoma-ca-95476-26082579)

---

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