On average, listings lease in the $20's per square foot per year. The Missouri region is going through a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 4% decline in rent.
In the last 90 days, 1842 listings have been listed, so you'll want to check back regularly for new listings. About 2% of the listings in the Missouri are subleases, so you will probably have to consider a longer term lease. 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 2,740 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this area are close to 2 floors. Most buildings in this region were built in 1982 and are Class B.