A check on its website indicates that the South Station outlet of Cosi is no longer in business, as its page has been deleted and it is no longer listed in the locations section of the site. (A Yelp post seems to confirm this as well.) This comes a few weeks after the chain closed its Back Bay location--and subsequently filed for bankruptcy, had its stock delisted, and put its assets up for sale.
Locations of Cosi on Federal Street, High Street, Milk Street, and State Street in downtown Boston--along with the Seaport District, Logan Airport (2), and Cambridge's Kendall Square remain in operation for now.
[Earlier Articles]
Cosi Seeks to Sell Its Assets in What Could Be an Auction
Cosi to Be Delisted from The Nasdaq Stock Market
Cosi Files for Chapter 11 Bankruptcy
Cosi in Boston's Back Bay Has Closed
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[A related post from our sister site (Boston's Hidden Restaurants): List of Restaurant Closings and Openings in the Boston Area]