On average, listings lease in the $30's per square foot per year. The Reston submarket is going through a decline in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 9% decrease in rent.
Compared to the rest of the Washington D.C. market, the Reston region has higher rates, and you'll need to make a great offer to be in this hot region.
In the last 90 days, 33 listings have been made available, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 3% of the office spaces in the Reston are subleases, so you will probably need to consider the implications of signing a direct lease with the building. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 3,020 sqft, there are still 0 leases below 2,000 sqft. Most buildings in this market are approximately 5 floors. Most buildings in this market were built in 1987 and are Class A.