Compared to the rest of the Greater Boston market, the Londonderry region has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 28 listings have been listed, which means new availabilities most likley are going fast. You'll want to be prepared to make an offer immediately. About 7% of the available leases in the Londonderry are subleases, so you will probably have to consider a longer term 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.
The standard measurement for office space in this area is around 1,540 sqft. Most buildings in this area are approximately 2 stories. Most buildings in this market were built in 1988 and are Class B.