On average, listings lease in the $10's per square foot per year. The Alton region is going through a decline in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 4% decline in rent.
In the last 90 days, 56 listings have come on the market, 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.
Even though the median size is 3,000 sqft, there are still 0 new availabilities below 2,000 sqft. Most buildings in this market are close to 2 floors. Most buildings in this area were built in 1963 and are Class B.