The typical asking rate per listing is in the $10's per square foot per year. The Willimantic region is seeing a an increase in rates. In the last 3 months, the median rate rose $16 per sqft per year.
Compared to the rest of the Greater Boston market, the Willimantic region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 1 listings have been listed, 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 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 market are close to 2 floors. Most buildings in this market were built in 1925 and are Class C.