Loos paneled a 290-square-foot shoebox space with mahogany, onyx, marble, and mirrors, and installed a stained-glass American flag above the door. Within a few years, other American bars, like Kruger’s American Bar, sprang up in the city. The bartenders at Loos mixed all the drinks we now consider classics—Manhattans, sours, daiquiris, and martinis—until the space closed during World War II. It languished in the postwar period. Some musicians ran an underground club in the basement, while the barroom upstairs gathered dust.