The typical asking rate per listing is in the $20's per square foot per year. The Falls Church County submarket is going through a decrease in rates. In the last 3 months, the median rate fell $9 per sqft per year. That's a 25% decline in rent.
In the last 90 days, 1 listings have been listed, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 510 sqft. Most buildings in this area are around 2 stories. Most buildings in this area were built in 1981 and are Class B.