The typical asking rate per listing is in the $20's per square foot per year. The New Hampshire submarket is experiencing a a rise in rates. In the last 3 months, the median rate went up $22 per sqft per year.
In the last 90 days, 1552 listings have come on the market, so you'll want to check back regularly for new listings. About 33% of the listings in the New Hampshire 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,550 sqft. Most properties in this area are approximately 2 floors. Most buildings in this market were built in 1957 and are Class Class B.