Most listings are in the $10's per square foot per year. The Brownsburg region is seeing a a rise in rates. In the last 3 months, the median rate went up $15 per sqft per year.
In the last 90 days, 1 listings have come on the market, which means new listings are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 200% of the available leases in the Brownsburg are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 2,450 sqft. Most buildings in this area are around 1 stories. Most buildings in this area were built in 1995 and are Class B.