On average, listings lease in the $20's per square foot per year. The Des Peres region is seeing a decline in rates. In the last 3 months, the median rate decreased $2 per sqft per year. That's a 7% decline in rent.
In the last 90 days, 4 listings have been made available, which means new listings are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 1,310 sqft. Most buildings in this market are close to 2 stories. Most buildings in this area were built in 1987 and are Class A.