The typical asking rate per listing is in the $0's per square foot per year. The Mandan submarket is going through a decrease in rates. In the last 3 months, the median rate fell $15 per sqft per year. That's a 100% decrease in rent.
In the last 90 days, 1 listings have been posted online, which means leases are probably going fast. You'll want to be prepared to tour spaces as quick as possible. 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 sqft. Most buildings in this market were built in 1978 and are Class A.