The typical asking rate per listing is in the $20's per square foot per year. The Lake St. Louis region is seeing a a boost in rates. In the last 3 months, the median rate increased $24 per sqft per year.
In the last 90 days, 2 listings have been listed, which means leases most likley are going fast. You'll want to be prepared to make an offer immediately. About 300% of the listings in the Lake St. Louis are subleases, so you might be able to find a shorter term or below market rent. 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 5,680 sqft, there are still 0 new availabilities below 2,000 sqft. Most buildings in this region are around 3 stories. Most buildings in this area were built in 2000 and are Class B.