Most listings are in the $120's per square foot per year. The Norwich submarket is going through a a rise in rates. In the last 3 months, the median rate rose $61 per sqft per year. That's a 92% increase in rent.
In the last 90 days, 11 listings have been posted online, which means leases are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 91% of the listings 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 area are close to 2 stories. Most buildings in this market were built in 1910 and are Class B.