On average, listings lease in the $10's per square foot per year. The South Bend region is experiencing a a boost in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 7% increase in rent.
In the last 90 days, 33 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 3% of the office spaces in the South Bend 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 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 2,500 sqft. Most buildings in this region are close to 2 stories. Most buildings in this market were built in 1971 and are Class B.