Compared to the rest of the Bay Area market, the Santa Rosa submarket has smaller rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 36 listings have been posted online, which means new listings most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. 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 2,260 sqft. Most properties in this region are around 2 floors. Most buildings in this area were built in 1982 and are Class B.