Most listings are in the $20's per square foot per year. The North Kansas City region is going through a an increase in rates. In the last 3 months, the median rate rose $5 per sqft per year. That's a 34% rise in rent.
In the last 90 days, 22 listings have been listed, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 9% of the listings in the North Kansas City are subleases, so you will probably have to focus your search on direct office leases. 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 930 sqft. Most buildings in this market are close to 2 floors. Most buildings in this area were built in 1953 and are Class B.