On average, listings lease in the $10's per square foot per year. The O'Fallon region is going through a decrease in rates. In the last 3 months, the median rate fell $5 per sqft per year. That's a 21% decrease in rent.
In the last 90 days, 9 listings have been posted online, which means new availabilities are probably going fast. 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.
Even though the median size is 2,830 sqft, there are still 0 new availabilities below 2,000 sqft. Most properties in this market are close to 1 floors. Most buildings in this region were built in 1999 and are Class B.