On average, listings lease in the $120's per square foot per year. The Norwich submarket is going through a decrease in rates. In the last 3 months, the median rate fell $127 per sqft per year. That's a 50% decrease in rent.
In the last 90 days, 11 listings have been made available, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 127% of the available leases in the Norwich 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 2,200 sqft. Most properties in this region are approximately 2 stories. Most buildings in this market were built in 1910 and are Class B.