The typical asking rate per listing is in the $20's per square foot per year. The Mystic submarket is seeing a decline in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 12% decline in rent.
In the last 90 days, 2 listings have been listed, which means new availabilities most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 200% 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 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 1,430 sqft. Most properties in this market are approximately 1 floors. Most buildings in this market were built in 1920 and are Class A.