Most listings are in the $20's per square foot per year. The Petaluma submarket is going through a decrease in rates. In the last 3 months, the median rate decreased $4 per sqft per year. That's a 14% decline in rent.
Compared to the rest of the Bay Area market, the Petaluma region has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 58 listings have been listed, so you'll want to check back regularly for new listings. About 2% of the office spaces in the Petaluma are subleases, so you will probably have to focus your search on direct office leases. 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 2,200 sqft. Most buildings in this region are close to 1 stories. Most buildings in this region were built in 1990 and are Class A.