The typical asking rate per listing is in the $10's per square foot per year. The North Haven submarket is experiencing a a boost in rates. In the last 3 months, the median rate went up $16 per sqft per year.
In the last 90 days, 5 listings have been posted online, which means office spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 20% of the available leases in the North Haven are subleases, so you might be able to find a shorter term or below market rent. 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 3,000 sqft, there are still 0 leases below 2,000 sqft. Most properties in this area are close to 2 stories. Most buildings in this area were built in 1986 and are Class B.