The typical asking rate per listing is in the $10's per square foot per year. The Fargo region is going through a decline in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 13% decrease in rent.
In the last 90 days, 11 listings have been posted online, which means listings are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 9% of the available space in the Fargo are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 1,500 sqft. Most buildings in this area are close to 2 floors. Most buildings in this region were built in 1997 and are Class B.