The typical asking rate per listing is in the $20's per square foot per year. The Leesburg submarket is experiencing a an increase in rates. In the last 3 months, the median rate increased $29 per sqft per year.
Compared to the rest of the Washington D.C. market, the Leesburg submarket has less expensive rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 4 listings have been listed, which means listings most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 300% of the available leases in the Leesburg are subleases, so you might be able to snag a great spot on a short term. 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 1,720 sqft. Most buildings in this area are around 3 stories. Most buildings in this region were built in 1990 and are Class B.