On average, listings lease in the $20's per square foot per year. The New Haven region is going through a a boost in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 2% rise in rent.
In the last 90 days, 43 listings have come on the market, 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 sign a shorter term by taking over a previous lease. 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 3,270 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this area are close to 3 floors. Most buildings in this market were built in 1920 and are Class B.