Most listings are in the $10's per square foot per year. The Cass County region 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 11% rise in rent.
In the last 90 days, 9 listings have been listed, which means new listings are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 11% of the available leases in the Cass County are subleases, so you might be able to find a shorter term or below market rent. 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 2,400 sqft. Most properties in this area are close to 2 stories. Most buildings in this market were built in 1997 and are Class A.