Most listings are in the $30's per square foot per year. The New Haven submarket is going through a an increase in rates. In the last 3 months, the median rate went up $8 per sqft per year. That's a 32% increase in rent.
In the last 90 days, 43 listings have been made available, so you'll want to check back regularly for new listings. About 2% of the available space in the New Haven are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 4,070 sqft, there are still 0 new listings below 2,000 sqft. Most buildings in this market are close to 3 floors. Most buildings in this area were built in 1929 and are Class A.