On average, listings lease 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 went up $9 per sqft per year. That's a 47% rise in rent.
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 depreciated submarket.
In the last 90 days, 187 listings have been listed, so you'll want to check back regularly for new listings. About 3% of the available leases in the Santa Rosa are subleases, so you will probably have to consider a longer term lease. 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 2,400 sqft. Most buildings in this region are close to 2 floors. Most buildings in this region were built in 1982 and are Class A.