The typical asking rate per listing is in the $10's per square foot per year. The Hampton region is going through a an increase in rates. In the last 3 months, the median rate went up $16 per sqft per year.
Compared to the rest of the Greater Boston market, the Hampton region has lower rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 24 listings have been posted online, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,720 sqft. Most buildings in this market are close to 2 floors. Most buildings in this market were built in 1969 and are Class A.