The typical asking rate per listing is in the $10's per square foot per year. The Rock Island County region is going through a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 8% decline in rent.
In the last 90 days, 66 listings have been listed, so you'll want to check back regularly for new listings. About 47% of the listings in the Rock Island County 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,500 sqft. Most buildings in this area are approximately 1 stories. Most buildings in this region were built in 1972 and are Class B.