Most listings are in the $20's per square foot per year. The Santa Rosa submarket is seeing a a rise in rates. In the last 3 months, the median rate rose $27 per sqft per year.
Compared to the rest of the Bay Area market, the Santa Rosa submarket has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 36 listings have been made available, which means spaces might be going fast. You'll want to be prepared to tour spaces as quick as possible. About 164% of the office spaces 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,420 sqft. Most properties in this area are approximately 2 floors. Most buildings in this region were built in 1982 and are Class B.