The typical asking rate per listing is in the $20's per square foot per year. The Maryland Heights region is experiencing a an increase in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 6% increase in rent.
In the last 90 days, 31 listings have been made available, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 13% of the listings in the Maryland Heights are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
Even though the median size is 5,310 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this area are close to 2 stories. Most buildings in this market were built in 1984 and are Class B.