On average, listings lease 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 $18 per sqft per year.
Compared to the rest of the Chicagoland market, the Chesterton submarket has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 19 listings have been made available, which means office spaces might be going fast. You'll want to be prepared to make an offer immediately. About 5% of the available space in the Chesterton are subleases, so you will probably have to focus your search on direct office leases. 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 properties in this market are close to 3 stories. Most buildings in this market were built in 1965 and are Class B.