Most listings are in the $10's per square foot per year. The Chesterton region is going through a a rise in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 8% rise in rent.
Compared to the rest of the Chicagoland market, the Chesterton submarket has less expensive rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 4 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.
The standard measurement for office space in this area is around 1,200 sqft. Most buildings in this market are approximately 3 floors. Most buildings in this market were built in 1965 and are Class C.