According to a Twitter post from @StevenL57, Osushi in The Westin Copley Place on Huntington Avenue is shuttered, per a sign in the restaurant's window. The Boston Hospitality and Tourism Industry Blog mentions that the restaurant's location in Cambridge's Harvard Square is still in operation, with the article also saying that it is not yet known what might replace the Back Bay location of the eatery.
The address for this now-closed sushi bar in the Back Bay was: Osushi, 10 Huntington Avenue, Boston, MA, 02116. The website for the Cambridge location can be found at http://osushicambridge.com/
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