On average, listings lease in the $20's per square foot per year. The St. Peters region is experiencing a an increase in rates. In the last 3 months, the median rate rose $5 per sqft per year. That's a 22% rise in rent.
In the last 90 days, 22 listings have been made available, which means new availabilities might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 5% of the available space in the St. Peters are subleases, so you will probably have to focus your search on direct office leases. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 950 sqft. Most properties in this area are around 1 stories. Most buildings in this market were built in 1999 and are Class B.