Brentano's, the old shop at 37 Avenue de L'Opéra, whose customers included Mark Twain, Scott Fitzgerald and Ernest Hemingway, was shut after its landlord, the BNP Parisbas bank, won a liquidation order for non-payment of rent. For some time, the store was locally owned, no longer part of the historic New York-based company which is now a brand in the Borders Group. The American bookstore has been a Paris fixture since 1895.
Charles Bremner's story is here
And a list of other English language bookshops in Paris is here
WH Smith in rue de Rivoli is still going.