The typical asking rate per listing is in the $20's per square foot per year. The Brownsburg region is going through a a boost in rates. In the last 3 months, the median rate rose $21 per sqft per year.
In the last 90 days, 1 listings have been posted online, which means listings most likley are 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 posted, so finding a space for a small business might be tough.
Even though the median size is 5,000 sqft, there are still 0 leases below 2,000 sqft. Most properties in this market are around 1 stories. Most buildings in this area were built in 2003 and are Class C.