The typical asking rate per listing is in the $20's per square foot per year. The Webster Groves submarket is experiencing a decrease in rates. In the last 3 months, the median rate fell $4 per sqft per year. That's a 12% decrease in rent.
In the last 90 days, 2 listings have come on the market, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 840 sqft. Most buildings in this region are around 2 floors. Most buildings in this market were built in 1968 and are Class B.