On average, listings lease in the $10's per square foot per year. The Kirkwood submarket is going through a decline in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 15% decrease in rent.
In the last 90 days, 1 listings have been made available, 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 1,600 sqft. Most buildings in this region were built in 2011.