Most listings are in the $20's per square foot per year. The Petaluma region is experiencing a decrease in rates. In the last 3 months, the median rate decreased $5 per sqft per year. That's a 15% decline in rent.
Compared to the rest of the Bay Area market, the Petaluma submarket has less expensive rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 31 listings have come on the market, which means new availabilities are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 68% of the office spaces in the Petaluma 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 posted, so finding a space for a small business might be tough.
Even though the median size is 2,530 sqft, there are still 0 office spaces below 2,000 sqft. Most properties in this market are around 2 floors. Most buildings in this area were built in 1990 and are Class A.