On average, listings lease in the $20's per square foot per year. The Franconia region is seeing a a rise in rates. In the last 3 months, the median rate went up $25 per sqft per year.
Compared to the rest of the Washington D.C. market, the Franconia submarket has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 1 listings have come on the market, which means new availabilities most likley are going fast. You'll want to be prepared to make an offer immediately. About 900% of the office spaces in the Franconia 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 1,000 sqft. Most buildings in this market are around 2 stories. Most buildings in this region were built in 1997 and are Class A.