Most listings are in the $10's per square foot per year. The Chesterton region is going through a a boost 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 smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 4 listings have come on the market, which means new availabilities are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 25% of the office spaces 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 properties in this market are approximately 3 stories. Most buildings in this area were built in 1965 and are Class B.