In the last 90 days, 11 listings have been made available, which means leases are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 55% of the available leases in the Mehlville are subleases, so you might be able to sign a shorter term by taking over a previous lease. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 800 sqft. Most buildings in this region were built in 1982 and are Class C.