On average, listings lease in the $30's per square foot per year. The Fairfax County submarket is going through a an increase in rates. In the last 3 months, the median rate rose $4 per sqft per year. That's a 11% rise in rent.
In the last 90 days, 234 listings have been posted online, so you'll want to check back regularly for new listings. About 97% of the available space in the Fairfax County 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 4,520 sqft, there are still 0 new listings below 2,000 sqft. Most buildings in this area are approximately 4 floors. Most buildings in this area were built in 1987 and are Class A.