On average, listings lease in the $20's per square foot per year. The Rockville submarket is going through a decrease in rates. In the last 3 months, the median rate fell $10 per sqft per year. That's a 27% decline in rent.
Compared to the rest of the Washington D.C. market, the Rockville region has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 33 listings have been made available, which means listings most likley are going fast. You'll want to be prepared to make an offer immediately. About 167% of the listings in the Rockville 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 on the market, so finding a space for a small business might be tough.
Even though the median size is 3,320 sqft, there are still 0 new listings below 2,000 sqft. Most buildings in this region are around 4 stories. Most buildings in this area were built in 1985 and are Class A.