The typical asking rate per listing is in the $20's per square foot per year. The Mystic region is experiencing a a boost in rates. In the last 3 months, the median rate went up $25 per sqft per year.
In the last 90 days, 2 listings have come on the market, which means new availabilities might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 50% of the listings in the Mystic 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 900 sqft. Most buildings in this market are around 1 stories. Most buildings in this area were built in 1920.