The typical asking rate per listing is in the $20's per square foot per year. The New Haven submarket is going through a a boost in rates. In the last 3 months, the median rate rose $5 per sqft per year. That's a 20% rise in rent.
In the last 90 days, 21 listings have been listed, which means listings are probably going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 3,130 sqft, there are still 0 leases below 2,000 sqft. Most properties in this region are approximately 3 floors. Most buildings in this area were built in 1926 and are Class B.