The typical asking rate per listing is in the $20's per square foot per year. The Calverton region is going through a a boost in rates. In the last 3 months, the median rate went up $29 per sqft per year.
Compared to the rest of the Washington D.C. market, the Calverton submarket 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 been made available, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 620% of the available leases in the Calverton are subleases, so you might be able to find a shorter term or below market rent. 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 3,000 sqft, there are still 0 spaces below 2,000 sqft. Most properties in this area are approximately 6 floors. Most buildings in this area were built in 1987 and are Class B.