On average, listings lease in the $30's per square foot per year. The Fairfield region is experiencing a an increase in rates. In the last 3 months, the median rate increased $40 per sqft per year.
Compared to the rest of the Bay Area market, the Fairfield region has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 14 listings have been listed, which means new listings are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 150% of the available leases in the Fairfield are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 1,460 sqft. Most properties in this region are around 1 stories. Most buildings in this region were built in 1989 and are Class B.