Most listings are in the $20's per square foot per year. The Vacaville submarket is seeing a a boost in rates. In the last 3 months, the median rate rose $25 per sqft per year.
Compared to the rest of the Bay Area market, the Vacaville region has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 1 listings have been posted online, which means new availabilities might be going fast. 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 470 sqft. Most buildings in this area are around 1 floors. Most buildings in this area were built in 1988 and are Class A.