The typical asking rate per listing is in the $10's per square foot per year. The South Bend region is going through a a boost in rates. In the last 3 months, the median rate went up $20 per sqft per year.
In the last 90 days, 31 listings have been made available, which means new listings are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 100% of the available space in the South Bend are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,200 sqft. Most buildings in this region are around 2 stories. Most buildings in this area were built in 1970 and are Class B.