The typical asking rate per listing is in the $20's per square foot per year. The Winnebago County region is seeing a a boost in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 13% rise in rent.
In the last 90 days, 9 listings have been posted online, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 111% of the available leases in the Winnebago County 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 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 1,950 sqft. Most properties in this market are around 1 floors. Most buildings in this region were built in 1961 and are Class B.