Most listings are in the $20's per square foot per year. The Santa Rosa submarket is experiencing a a boost in rates. In the last 3 months, the median rate rose $2 per sqft per year. That's a 6% rise in rent.
Compared to the rest of the Bay Area market, the Santa Rosa region has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 36 listings have been posted online, which means spaces are probably going fast. You'll want to be prepared to make an offer immediately. About 206% of the listings in the Santa Rosa 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 on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,050 sqft. Most buildings in this region are close to 2 stories. Most buildings in this market were built in 1981 and are Class B.