On average, listings lease in the $50's per square foot per year. The West Haven region is going through a a rise in rates. In the last 3 months, the median rate increased $59 per sqft per year.
In the last 90 days, 19 listings have been posted online, which means spaces most likley are 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,700 sqft. Most buildings in this region are approximately 1 stories. Most buildings in this area were built in 1961.