In the last 90 days, 33 listings have been posted online, which means leases most likley are going fast. You'll want to be prepared to make an offer immediately. About 3% of the listings in the Portsmouth 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 on the market, so finding a space for a small business might be tough.
Even though the median size is 2,550 sqft, there are still 0 listings below 2,000 sqft. Most properties in this area are approximately 3 floors. Most buildings in this market were built in 1978 and are Class B.