On average, listings lease in the $30's per square foot per year. The Reston region is going through a a boost in rates. In the last 3 months, the median rate went up $0 per sqft per year. That's a 1% rise in rent.
Compared to the rest of the Washington D.C. market, the Reston region has more expensive rates, and you'll need to make a great offer to be in this hot submarket.
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 tour spaces as quick as possible. About 112% of the available leases in the Reston are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 3,570 sqft, there are still 0 office spaces below 2,000 sqft. Most properties in this market are close to 5 stories. Most buildings in this region were built in 1987 and are Class A.