Most listings are in the $10's per square foot per year. The North Haven submarket is experiencing a an increase in rates. In the last 3 months, the median rate increased $16 per sqft per year.
In the last 90 days, 3 listings have come on the market, which means office spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 33% of the available leases in the North Haven are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 24,290 sqft, there are still 0 office spaces below 2,000 sqft. Most properties in this area are around 2 floors. Most buildings in this area were built in 1986 and are Class B.