On average, listings lease in the $20's per square foot per year. The Antioch region is seeing a a boost in rates. In the last 3 months, the median rate went up $6 per sqft per year. That's a 31% 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 region.
In the last 90 days, 19 listings have been made available, which means spaces most likley are 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 1,680 sqft. Most buildings in this market are approximately 1 stories. Most buildings in this market were built in 1989 and are Class C.