On average, listings lease in the $20's per square foot per year. The Santa Rosa submarket is seeing a a boost in rates. In the last 3 months, the median rate rose $2 per sqft per year. That's a 7% rise in rent.
Compared to the rest of the Bay Area market, the Santa Rosa region has lower rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 36 listings have been listed, which means listings are probably going fast. You'll want to be prepared to make an offer immediately. 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 1,300 sqft. Most buildings in this region are around 2 stories. Most buildings in this region were built in 1982 and are Class B.