On average, listings lease in the $20's per square foot per year. The St. Charles County region is going through a a rise in rates. In the last 3 months, the median rate rose $5 per sqft per year. That's a 29% rise in rent.
In the last 90 days, 113 listings have been listed, so you'll want to check back regularly for new listings. About 60% of the available leases in the St. Charles County 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.
The standard measurement for office space in this area is around 1,810 sqft. Most buildings in this region are close to 1 stories. Most buildings in this market were built in 1999 and are Class B.