On average, listings lease in the $20's per square foot per year. The Springfield region is going through a a rise in rates. In the last 3 months, the median rate increased $4 per sqft per year. That's a 21% increase in rent.
Compared to the rest of the Washington D.C. market, the Springfield region has lower rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 5 listings have come on the market, which means spaces might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 2,500 sqft. Most properties in this area are around 2 floors. Most buildings in this market were built in 1981 and are Class B.