The typical asking rate per listing is in the $20's per square foot per year. The Springfield region is going through a an increase in rates. In the last 3 months, the median rate increased $5 per sqft per year. That's a 23% increase in rent.
Compared to the rest of the Washington D.C. market, the Springfield submarket has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 15 listings have been posted online, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 5,000 sqft, there are still 0 listings below 2,000 sqft. Most properties in this region are around 2 stories. Most buildings in this region were built in 1981 and are Class C.