Most listings are in the $10's per square foot per year. The Johnson County submarket is experiencing a a boost in rates. In the last 3 months, the median rate went up $19 per sqft per year.
In the last 90 days, 40 listings have come on the market, which means leases are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 60% of the listings in the Johnson County are subleases, so you might be able to snag a great spot on a short term. 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 1,880 sqft. Most buildings in this area are close to 2 floors. Most buildings in this market were built in 1999 and are Class A.