Compared to the rest of the Washington D.C. market, the Lorton submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 5 listings have been posted online, which means leases most likley are 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 600 sqft. Most buildings in this market are close to 2 floors. Most buildings in this region were built in 1985 and are Class A.