Most listings are in the $0's per square foot per year. The Sonoma region is experiencing a decline in rates. In the last 3 months, the median rate fell $50 per sqft per year. That's a 100% decline in rent.
In the last 90 days, 5 listings have come on the market, which means listings most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 4,640 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this region are around 2 floors. Most buildings in this market were built in 1978 and are Class C.