On average, listings lease in the $20's per square foot per year. The Springfield region is going through a decrease in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 14% decline in rent.
In the last 90 days, 37 listings have been listed, which means listings are probably going fast. You'll want to be prepared to make an offer immediately. 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 1,510 sqft. Most buildings in this region are around 2 floors. Most buildings in this area were built in 1900 and are Class B.