Compared to the rest of the Bay Area market, the Sonoma submarket has greater rates, and you'll need to pay a premium to be in this hot submarket.
In the last 90 days, 16 listings have been listed, which means office spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 830 sqft. Most properties in this area are around 2 stories. Most buildings in this region were built in 1974 and are Class C.