On average, listings lease in the $10's per square foot per year. The Londonderry submarket is going through a a rise in rates. In the last 3 months, the median rate increased $2 per sqft per year. That's a 13% rise in rent.
Compared to the rest of the Greater Boston market, the Londonderry submarket has lower rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 1 listings have been listed, which means office spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. 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 980 sqft. Most buildings in this market are around 2 stories. Most buildings in this market were built in 0 and are Class B.