Most listings are in the $20's per square foot per year. The Windham County region is going through a decline in rates. In the last 3 months, the median rate decreased $16 per sqft per year. That's a 40% decrease in rent.
In the last 90 days, 5 listings have been posted online, which means new availabilities most likley are 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 posted, 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 buildings in this area are around 1 stories. Most buildings in this area were built in 1940 and are Class B.