On average, listings lease in the $10's per square foot per year. The Damascus region is experiencing a an increase in rates. In the last 3 months, the median rate rose $18 per sqft per year.
Compared to the rest of the Washington D.C. market, the Damascus region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 3 listings have been made available, which means leases most likley are going fast. You'll want to be prepared to make an offer immediately. 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 1,500 sqft. Most buildings in this market were built in 1980 and are Class A.