The typical asking rate per listing is in the $20's per square foot per year. The Portsmouth County region is going through a a boost in rates. In the last 3 months, the median rate increased $2 per sqft per year. That's a 11% increase in rent.
In the last 90 days, 26 listings have come on the market, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 73% of the available leases in the Portsmouth County are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 7,810 sqft, there are still 0 new listings below 2,000 sqft. Most properties in this area are close to 2 stories. Most buildings in this area were built in 1984 and are Class B.