Most listings are in the $10's per square foot per year. The Chesterton submarket is going through a an increase in rates. In the last 3 months, the median rate rose $18 per sqft per year.
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 region.
In the last 90 days, 4 listings have been made available, which means leases might be going fast. You'll want to be prepared to make an offer immediately. About 25% of the available leases in the Chesterton are subleases, so you might be able to find a shorter term or below market rent. 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 1,200 sqft. Most buildings in this market are approximately 3 floors. Most buildings in this market were built in 1965 and are Class B.