Most listings are in the $10's per square foot per year. The St. Charles County region is going through a a boost in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 3% increase in rent.
In the last 90 days, 86 listings have been made available, so you'll want to check back regularly for new listings. There aren't many listings below 2,000 square feet available, 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 properties in this market are approximately 1 floors. Most buildings in this area were built in 2000 and are Class B.