On average, listings lease in the $10's per square foot per year. The Olathe submarket is experiencing a decline in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 15% decline in rent.
In the last 90 days, 14 listings have come on the market, which means leases 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 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 2,500 sqft. Most buildings in this region are close to 1 floors. Most buildings in this market were built in 1988 and are Class B.