Most listings are in the $20's per square foot per year. The Connecticut region is going through a decline in rates. In the last 3 months, the median rate decreased $4 per sqft per year. That's a 15% decrease in rent.
In the last 90 days, 1384 listings have been listed, so you'll want to check back regularly for new listings. About 2% of the available space in the Connecticut are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 2,150 sqft. Most properties in this market are close to 2 stories. Most buildings in this area were built in 1979 and are Class A.