Most listings are in the $30's per square foot per year. The Groveton submarket is seeing a a boost in rates. In the last 3 months, the median rate increased $34 per sqft per year.
Compared to the rest of the Washington D.C. market, the Groveton region has higher rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 1 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 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 2,000 sqft. Most buildings in this area were built in 1993 and are Class B.