Most listings are in the $20's per square foot per year. The St. Louis County submarket is going through a an increase in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 15% increase in rent.
In the last 90 days, 233 listings have come on the market, so you'll want to check back regularly for new listings. About 6% of the available space in the St. Louis County 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.
Even though the median size is 2,920 sqft, there are still 0 new availabilities below 2,000 sqft. Most properties in this area are approximately 2 floors. Most buildings in this area were built in 1983 and are Class B.