On average, listings lease in the $20's per square foot per year. The O'Fallon region is seeing a a boost 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 spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 2,790 sqft, there are still 0 leases below 2,000 sqft. Most properties in this region are around 2 floors. Most buildings in this region were built in 2001 and are Class A.