The typical asking rate per listing is in the $20's per square foot per year. The Crystal Lake region is going through a decline in rates. In the last 3 months, the median rate fell $2 per sqft per year. That's a 7% decrease in rent.
Compared to the rest of the Chicagoland market, the Crystal Lake submarket has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 31 listings have been made available, which means spaces might be leasing quickly. You'll want to be prepared to make an offer immediately. About 6% of the available space in the Crystal Lake are subleases, so you will probably have to focus your search on direct office leases. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,210 sqft. Most properties in this market are around 1 stories. Most buildings in this region were built in 1996 and are Class A.