On average, listings lease in the $0's per square foot per year. The Alton submarket is going through a decline in rates. In the last 3 months, the median rate decreased $16 per sqft per year. That's a 100% decrease in rent.
In the last 90 days, 56 listings have been listed, so you'll want to check back regularly for new listings. 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 sqft. Most buildings in this market are around 2 floors. Most buildings in this area were built in 1963 and are Class B.