The typical asking rate per listing is in the $20's per square foot per year. The Fresno region is going through a decrease in rates. In the last 3 months, the median rate decreased $2 per sqft per year. That's a 7% decline in rent.
In the last 90 days, 360 listings have been listed, so you'll want to check back regularly for new listings. About 17% of the available leases in the Fresno are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,280 sqft. Most properties in this area are around 1 floors. Most buildings in this market were built in 1983 and are Class B.