On average, listings lease in the $20's per square foot per year. The New Haven submarket is seeing a an increase in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 17% rise in rent.
In the last 90 days, 21 listings have been listed, which means office spaces are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,140 sqft. Most properties in this region are around 3 stories. Most buildings in this market were built in 1926 and are Class B.