On average, listings lease in the $10'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 $2 per sqft per year. That's a 11% decrease in rent.
In the last 90 days, 99 listings have been made available, so you'll want to check back regularly for new listings. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,700 sqft. Most properties in this market are approximately 2 floors. Most buildings in this region were built in 1963 and are Class B.