Compared to the rest of the Bay Area market, the Fairfield submarket has lower rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 14 listings have come on the market, which means new availabilities most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 36% of the office spaces in the Fairfield 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.
The standard measurement for office space in this area is around 1,460 sqft. Most buildings in this area are approximately 1 floors. Most buildings in this market were built in 1989 and are Class B.