On average, listings lease in the $10's per square foot per year. The Champaign region is going through a an increase in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 7% rise in rent.
In the last 90 days, 31 listings have been posted online, which means leases might be going fast. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,540 sqft. Most buildings in this area are approximately 2 stories. Most buildings in this region were built in 1988 and are Class A.