On average, listings lease in the $30's per square foot per year. The Gaithersburg region is going through a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 4% decrease in rent.
Compared to the rest of the Washington D.C. market, the Gaithersburg region has less expensive rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 16 listings have been posted online, which means leases are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 13% of the office spaces 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,150 sqft. Most properties in this market are around 2 floors. Most buildings in this region were built in 1989 and are Class B.