On average, listings lease in the $10's per square foot per year. The O'Fallon region is seeing a an increase in rates. In the last 3 months, the median rate went up $4 per sqft per year. That's a 25% increase in rent.
In the last 90 days, 25 listings have been posted online, which means new listings might be 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 posted, 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 are around 1 stories. Most buildings in this market were built in 2001 and are Class A.