Most listings are in the $10's per square foot per year. The Munster region is seeing 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 Munster submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 1 listings have been made available, which means office spaces are probably going fast. You'll want to be prepared to make an offer immediately. About 700% of the available leases in the Munster are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 area are close to 2 floors. Most buildings in this area were built in 1978 and are Class A.