The typical asking rate per listing is in the $10's per square foot per year. The Springfield region is experiencing a an increase in rates. In the last 3 months, the median rate rose $20 per sqft per year.
In the last 90 days, 11 listings have been made available, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 100% of the available leases in the Springfield are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 1,740 sqft. Most properties in this region are approximately 1 floors. Most buildings in this area were built in 2006 and are Class B.