On average, listings lease in the $20's per square foot per year. The Dulles Town Center region is going through a decline in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 10% decline in rent.
Compared to the rest of the Washington D.C. market, the Dulles Town Center region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 9 listings have been listed, which means spaces might be leasing quickly. You'll want to be prepared to make an offer immediately. 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 1,780 sqft. Most properties in this area are approximately 1 stories. Most buildings in this market were built in 2001 and are Class A.