In the last 90 days, 8 listings have been made available, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 25% of the available space in the Dahlgren 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 on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,000 sqft. Most properties in this area are approximately 2 stories. Most buildings in this area were built in 1991 and are Class B.