In the last 90 days, 2 listings have been posted online, which means spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 50% of the available leases in the Mystic 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.
The standard measurement for office space in this area is around 900 sqft. Most buildings in this market are close to 1 stories. Most buildings in this market were built in 1920.