Most listings are in the $10's per square foot per year. The Antioch region is going through a a rise in rates. In the last 3 months, the median rate rose $4 per sqft per year. That's a 26% rise in rent.
Compared to the rest of the East Bay market, the Antioch submarket has lower rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 17 listings have been listed, which means new listings 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,370 sqft. Most buildings in this region are around 1 stories. Most buildings in this area were built in 1989 and are Class C.