Most listings are in the $20's per square foot per year. The St. Charles region is seeing a decline in rates. In the last 3 months, the median rate fell $11 per sqft per year. That's a 29% decrease in rent.
In the last 90 days, 24 listings have been posted online, which means office spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 46% of the listings in the St. Charles are subleases, so you might be able to sign a shorter term by taking over a previous lease. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 4,120 sqft, there are still 0 leases below 2,000 sqft. Most buildings in this region are approximately 1 stories. Most buildings in this area were built in 1989 and are Class B.