The typical asking rate per listing is in the $10's per square foot per year. The Leesburg submarket is going through a a boost in rates. In the last 3 months, the median rate rose $2 per sqft per year. That's a 13% increase in rent.
In the last 90 days, 6 listings have been made available, which means office spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 17% of the available space in the Leesburg 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 available, so finding a space for a small business might be tough.
Even though the median size is 6,000 sqft, there are still 0 new availabilities below 2,000 sqft. Most buildings in this market are around 1 floors. Most buildings in this market were built in 1980 and are Class A.