The typical asking rate per listing is in the $10's per square foot per year. The San Joaquin region is going through a an increase in rates. In the last 3 months, the median rate went up $3 per sqft per year. That's a 20% increase in rent.
In the last 90 days, 76 listings have been posted online, so you'll want to check back regularly for new listings. About 1% of the available space in the San Joaquin are subleases, so you will probably have to focus your search on direct office leases. 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 2,160 sqft. Most properties in this area are around 0 stories. Most buildings in this market were built in 1978 and are Class A.