Most listings are in the $20's per square foot per year. The New Haven County region is going through a an increase in rates. In the last 3 months, the median rate rose $0 per sqft per year. That's a 2% increase in rent.
In the last 90 days, 228 listings have been posted online, so you'll want to check back regularly for new listings. About 2% of the available space in the New Haven County 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,600 sqft. Most buildings in this area are close to 2 floors. Most buildings in this region were built in 1975 and are Class A.