In the last 90 days, 80 listings have been made available, so you'll want to check back regularly for new listings. About 1% of the available leases 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.
The standard measurement for office space in this area is around 2,160 sqft. Most properties in this region are close to 3 floors. Most buildings in this market were built in 1964 and are Class B.