The Jamaica Plain news is reporting (via at Twitter post from @guarantdswahili) that Canto 6 on Washington Street will apparently close down at the end of August, and that there is currently a "For Rent" sign out front. The article mentions that the bakery could reopen in a new space at some point, and that it is not yet known why the place is leaving its space.
Canto 6 first opened approximately 10 years ago, offering a variety of soups, sandwiches, baked goods, and pastries.
The address for Canto 6 is 3346 Washington Street, Jamaica Plain, MA, 02130. Its website can be found at http://www.canto6bakeryjp.com/
[August 31 update: A call placed to Canto 6 confirms that today is indeed its last day in operation.]
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[Related article from our sister site (Boston's Hidden Restaurants): Slideshow--Ten Items from Bakeries and Pastry Shops in the Boston Area and Beyond]