On average, listings lease in the $40's per square foot per year. The Groton region is going through a a rise in rates. In the last 3 months, the median rate went up $42 per sqft per year.
In the last 90 days, 4 listings have been made available, which means new listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 25% of the available leases in the Groton 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.
The standard measurement for office space in this area is around 150 sqft. Most properties in this market are approximately 2 stories. Most buildings in this market were built in 1983.