Most listings are in the $20's per square foot per year. The Dulles Town Center submarket is experiencing a decrease in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 10% decrease in rent.
Compared to the rest of the Washington D.C. market, the Dulles Town Center submarket has lower rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 9 listings have been made available, which means spaces 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 posted, 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 around 1 floors. Most buildings in this area were built in 2001 and are Class A.