The typical asking rate per listing is in the $30's per square foot per year. The Fairfax submarket is experiencing a a boost in rates. In the last 3 months, the median rate rose $5 per sqft per year. That's a 20% rise in rent.
Compared to the rest of the Washington D.C. market, the Fairfax submarket has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 16 listings have been made available, which means new availabilities might be going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,220 sqft. Most buildings in this market are approximately 5 floors. Most buildings in this region were built in 1985 and are Class B.