Most listings are in the $10's per square foot per year. The Ballwin region is experiencing a an increase in rates. In the last 3 months, the median rate increased $17 per sqft per year.
In the last 90 days, 8 listings have been posted online, which means office spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 25% of the available leases in the Ballwin are subleases, so you might be able to snag a great spot on a short term. 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 4,240 sqft, there are still 0 new availabilities below 2,000 sqft. Most buildings in this market are around 3 floors. Most buildings in this market were built in 1990 and are Class B.