On average, listings lease in the $10's per square foot per year. The Alton submarket is experiencing a a rise in rates. In the last 3 months, the median rate rose $4 per sqft per year. That's a 27% rise in rent.
In the last 90 days, 49 listings have been posted online, so you'll want to check back regularly for new listings. 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 1,300 sqft. Most properties in this area are close to 2 floors. Most buildings in this area were built in 1964 and are Class B.