On average, listings lease in the $20's per square foot per year. The Antioch region is experiencing a an increase in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 13% increase in rent.
Compared to the rest of the East Bay market, the Antioch region has lower rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 25 listings have been listed, which means leases might be leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,910 sqft. Most properties in this region are close to 1 floors. Most buildings in this region were built in 1989 and are Class C.