Most listings are in the $10's per square foot per year. The Chesterton submarket is experiencing a a boost in rates. In the last 3 months, the median rate went up $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 discounted region.
In the last 90 days, 4 listings have been listed, which means listings are probably leasing quickly. 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 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 region are around 3 floors. Most buildings in this area were built in 1965 and are Class C.