The typical asking rate per listing is in the $10's per square foot per year. The Dubuque submarket is going through a a boost in rates. In the last 3 months, the median rate went up $4 per sqft per year. That's a 25% rise in rent.
In the last 90 days, 28 listings have been listed, which means new listings most likley are going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 5,450 sqft, there are still 0 new listings below 2,000 sqft. Most properties in this region are approximately 2 stories. Most buildings in this market were built in 1970 and are Class A.