On average, listings lease in the $10's per square foot per year. The Kirkwood region is going through a a rise in rates. In the last 3 months, the median rate rose $17 per sqft per year.
In the last 90 days, 1 listings have come on the market, which means new availabilities might be leasing quickly. You'll want to be prepared to make an offer immediately. 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 2,250 sqft. Most buildings in this region were built in 2005.