Compared to the rest of the Bay Area market, the Fairfield submarket has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 14 listings have been made available, which means office spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet available, 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 buildings in this region are around 1 stories. Most buildings in this area were built in 1989 and are Class B.