On average, listings lease in the $10's per square foot per year. The Johnson County region is going through a an increase in rates. In the last 3 months, the median rate rose $2 per sqft per year. That's a 12% rise in rent.
In the last 90 days, 7 listings have been made available, which means new listings are probably going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet available, 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 are close to 2 stories. Most buildings in this region were built in 1999 and are Class A.