Most listings are in the $10's per square foot per year. The South Bend region is going through a an increase in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 7% increase in rent.
In the last 90 days, 31 listings have been made available, which means 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 2,770 sqft, there are still 0 listings below 2,000 sqft. Most buildings in this region are around 2 stories. Most buildings in this area were built in 1972 and are Class B.