The typical asking rate per listing is in the $20's per square foot per year. The Falls Church County region is experiencing a an increase in rates. In the last 3 months, the median rate rose $26 per sqft per year.
In the last 90 days, 1 listings have been made available, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 900% of the office spaces in the Falls Church County 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 800 sqft. Most properties in this market are around 2 stories. Most buildings in this region were built in 1980 and are Class B.