Most listings are in the $10's per square foot per year. The Rock Island region is seeing a decline in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 8% decrease in rent.
In the last 90 days, 14 listings have come on the market, which means spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 57% of the available space in the Rock Island 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,650 sqft. Most buildings in this area are approximately 2 floors. Most buildings in this region were built in 1964 and are Class B.