On average, listings lease in the $20's per square foot per year. The New Hampshire region is going through a an increase in rates. In the last 3 months, the median rate rose $2 per sqft per year. That's a 10% increase in rent.
In the last 90 days, 1552 listings have come on the market, so you'll want to check back regularly for new listings. About 0% of the available space in the New Hampshire are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 2,220 sqft. Most properties in this region are around 2 floors. Most buildings in this region were built in 1952 and are Class Class B.