Compared to the rest of the Greater Boston market, the Willimantic region has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 2 listings have been made available, which means office spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 50% of the office spaces in the Willimantic 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 850 sqft. Most buildings in this area are approximately 2 floors. Most buildings in this area were built in 1925 and are Class C.