The typical asking rate per listing is in the $10's per square foot per year. The Crystal Lake region is experiencing a a boost in rates. In the last 3 months, the median rate rose $17 per sqft per year.
Compared to the rest of the Chicagoland market, the Crystal Lake submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 31 listings have been listed, which means leases are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 100% of the available space in the Crystal Lake are subleases, so you might be able to snag a great spot on a short term. 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 1,550 sqft. Most properties in this market are approximately 1 floors. Most buildings in this market were built in 1996 and are Class A.