The typical asking rate per listing is 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 $2 per sqft per year. That's a 8% increase in rent.
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 listed, which means listings are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 155% of the listings in the Gaithersburg are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,200 sqft. Most properties in this region are close to 2 floors. Most buildings in this area were built in 1989 and are Class B.