Most listings are in the $10's per square foot per year. The Hampton submarket is going through a an increase in rates. In the last 3 months, the median rate went up $2 per sqft per year. That's a 14% increase in rent.
Compared to the rest of the Greater Boston market, the Hampton region has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 30 listings have come on the market, which means new availabilities are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 1,300 sqft. Most properties in this area are approximately 2 floors. Most buildings in this market were built in 1969 and are Class A.