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 depreciated region.
In the last 90 days, 14 listings have been posted online, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 79% of the available space 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 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 properties in this region are around 1 floors. Most buildings in this market were built in 1989 and are Class B.