The typical asking rate per listing is in the $20's per square foot per year. The Antioch region is seeing a a rise in rates. In the last 3 months, the median rate increased $14 per sqft per year. That's a 88% rise in rent.
Compared to the rest of the East Bay market, the Antioch region has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 13 listings have been made available, which means spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. 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 1,260 sqft. Most properties in this market are approximately 1 stories. Most buildings in this market were built in 1989 and are Class C.