In the last 90 days, 5 listings have been posted online, which means new availabilities are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 20% of the available space in the Sonoma are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around sqft. Most properties in this region are close to 2 floors. Most buildings in this region were built in 1986 and are Class C.