Most listings are in the $10's per square foot per year. The Rock Island submarket is experiencing a an increase in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 7% rise in rent.
In the last 90 days, 35 listings have been made available, which means office spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 3% of the available leases in the Rock Island are subleases, so you will probably have to consider a longer term lease. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
Even though the median size is 3,700 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this market are around 2 floors. Most buildings in this market were built in 1971 and are Class B.