The typical asking rate per listing is in the $20's per square foot per year. The New Hampshire submarket is seeing a a boost in rates. In the last 3 months, the median rate rose $0 per sqft per year. That's a 1% rise in rent.
In the last 90 days, 1552 listings have been listed, so you'll want to check back regularly for new listings. About 1% of the listings in the New Hampshire are subleases, so you will probably have to consider a longer term lease. 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 1,740 sqft. Most properties in this region are around 2 floors. Most buildings in this market were built in 1950 and are Class Class B.