On average, listings lease in the $20's per square foot per year. The Merrimack County region is going through a a rise in rates. In the last 3 months, the median rate went up $3 per sqft per year. That's a 14% rise in rent.
In the last 90 days, 185 listings have been listed, so you'll want to check back regularly for new listings. About 1% of the available space in the Merrimack County 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,500 sqft. Most buildings in this market are around 2 stories. Most buildings in this region were built in 1950 and are Class Class B.