 According to Montgomery @-@ Massingberd and Watkin the exterior is both structurally and visually Franco @-@ American in influence with little trace of English architecture . For them the exterior " represents an evocative confluence of various Parisian architectural traditions " ; the Piccadilly arcade echoes the arcaded ground floor in the Place Vendrome and the Rue de Rivoli , the steep mansarded skyline on the Green Park facade echoes Hector Lefuel 's work on the Pavillon de Flore of the Louvre , while the tall windows and wall panels of the facades resemble those of Mewès 's earlier work on a smaller building made as a home for Jules Ferry on Rue Bayard . 
