The typical asking rate per listing is in the $20's per square foot per year. The O'Fallon submarket is going through a a rise in rates. In the last 3 months, the median rate increased $0 per sqft per year. That's a 1% increase in rent.
In the last 90 days, 12 listings have been made available, which means new listings most likley are 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.
Even though the median size is 2,790 sqft, there are still 0 new listings below 2,000 sqft. Most buildings in this region are close to 2 floors. Most buildings in this region were built in 2001 and are Class A.