On average, listings lease in the $20's per square foot per year. The Herndon region is going through a decrease in rates. In the last 3 months, the median rate fell $4 per sqft per year. That's a 13% decline in rent.
Compared to the rest of the Washington D.C. market, the Herndon submarket has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 15 listings have been listed, which means new availabilities are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 40% of the available leases in the Herndon are subleases, so you might be able to snag a great spot on a short term. 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 14,520 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this region are close to 1 floors. Most buildings in this region were built in 1987 and are Class B.