Most listings are in the $20's per square foot per year. The Martinez submarket is experiencing a a boost in rates. In the last 3 months, the median rate rose $5 per sqft per year. That's a 35% rise in rent.
In the last 90 days, 30 listings have been listed, which means new listings 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 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 2,500 sqft. Most buildings in this market are approximately 2 stories. Most buildings in this region were built in 1999 and are Class B.