The typical asking rate per listing is in the $20'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 went up $22 per sqft per year.
Compared to the rest of the Greater Boston market, the Londonderry region has smaller rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 28 listings have been listed, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 11% of the available space in the Londonderry 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 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 1,540 sqft. Most properties in this area are approximately 2 stories. Most buildings in this area were built in 1988 and are Class B.