Most listings are in the $30's per square foot per year. The New Haven submarket is going through a a rise in rates. In the last 3 months, the median rate rose $4 per sqft per year. That's a 14% rise in rent.
In the last 90 days, 43 listings have been posted online, so you'll want to check back regularly for new listings. About 140% of the listings in the New Haven 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 available, so finding a space for a small business might be tough.
Even though the median size is 4,270 sqft, there are still 0 spaces below 2,000 sqft. Most properties in this area are close to 3 floors. Most buildings in this market were built in 1920 and are Class B.