Most listings are in the $10's per square foot per year. The Rock Island region is going through a decrease in rates. In the last 3 months, the median rate decreased $7 per sqft per year. That's a 29% decline in rent.
In the last 90 days, 14 listings have come on the market, which means leases most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 7% of the listings in the Rock Island 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.
Even though the median size is 5,500 sqft, there are still 0 spaces below 2,000 sqft. Most properties in this area are close to 2 floors. Most buildings in this area were built in 1964 and are Class B.