The typical asking rate per listing is in the $20's per square foot per year. The Springfield submarket is going through a decline in rates. In the last 3 months, the median rate decreased $6 per sqft per year. That's a 20% decline in rent.
Compared to the rest of the Washington D.C. market, the Springfield submarket has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 7 listings have come on the market, which means leases are probably 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 1,100 sqft. Most properties in this area are close to 2 stories. Most buildings in this area were built in 1981 and are Class C.