The typical asking rate per listing is in the $20's per square foot per year. The Johnson County submarket is going through a a rise in rates. In the last 3 months, the median rate increased $2 per sqft per year. That's a 9% increase in rent.
In the last 90 days, 460 listings have been made available, so you'll want to check back regularly for new listings. About 24% of the available leases in the Johnson County are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 2,340 sqft. Most buildings in this area are around 2 floors. Most buildings in this region were built in 1985 and are Class B.