On average, listings lease in the $30's per square foot per year. The Gaithersburg region is seeing a a boost in rates. In the last 3 months, the median rate increased $32 per sqft per year.
Compared to the rest of the Washington D.C. market, the Gaithersburg submarket has smaller rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 20 listings have been made available, which means new availabilities are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 175% of the available space in the Gaithersburg 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.
The standard measurement for office space in this area is around 1,840 sqft. Most properties in this region are around 2 floors. Most buildings in this market were built in 1989 and are Class B.