Most listings are in the $10's per square foot per year. The Fargo region is going through a a boost in rates. In the last 3 months, the median rate increased $3 per sqft per year. That's a 15% increase in rent.
In the last 90 days, 7 listings have come on the market, which means new availabilities are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 14% of the office spaces in the Fargo 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 posted, 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 approximately 2 stories. Most buildings in this area were built in 1997 and are Class B.