Most listings are in the $10's per square foot per year. The St. Clair County submarket is seeing a a boost in rates. In the last 3 months, the median rate went up $19 per sqft per year.
In the last 90 days, 7 listings have been listed, which means new availabilities are probably 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,500 sqft. Most buildings in this market were built in 2006.