The typical asking rate per listing is in the $10's per square foot per year. The New London County region is going through a a boost in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 7% increase in rent.
In the last 90 days, 68 listings have been made available, so you'll want to check back regularly for new listings. About 1% of the listings in the New London County are subleases, so you will probably have to consider a longer term lease. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,000 sqft. Most properties in this region are around 2 floors. Most buildings in this area were built in 1961 and are Class A.