Most listings are in the $20's per square foot per year. The St. Peters submarket is experiencing a a rise in rates. In the last 3 months, the median rate rose $28 per sqft per year.
In the last 90 days, 28 listings have been listed, which means new listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 39% of the available space in the St. Peters are subleases, so you might be able to snag a great spot on a short term. 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 buildings in this region are close to 1 stories. Most buildings in this market were built in 1999 and are Class B.