Most listings are in the $20's per square foot per year. The Martinez region is going through a a rise 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 availabilities might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 region are approximately 2 stories. Most buildings in this region were built in 1999 and are Class B.