On average, listings lease in the $10's per square foot per year. The Olathe region is seeing a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 7% decline in rent.
In the last 90 days, 11 listings have been posted online, which means new availabilities most likley are 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 2,500 sqft. Most properties in this region are close to 1 floors. Most buildings in this area were built in 1988 and are Class B.