Most listings are in the $30's per square foot per year. The Gaithersburg submarket is seeing a an increase in rates. In the last 3 months, the median rate went up $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 less expensive 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 leases might be going fast. You'll want to be prepared to make an offer immediately. About 155% of the available leases 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 available, 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 buildings in this area are around 2 stories. Most buildings in this area were built in 1989 and are Class B.