On average, listings lease in the $10's per square foot per year. The Rohnert Park submarket is going through a decrease in rates. In the last 3 months, the median rate decreased $6 per sqft per year. That's a 23% decrease in rent.
Compared to the rest of the Bay Area market, the Rohnert Park submarket has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 43 listings have been made available, so you'll want to check back regularly for new listings. 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 1,620 sqft. Most properties in this market are close to 1 floors. Most buildings in this area were built in 1987 and are Class B.