The Guinness Storehouse (informally the Storehouse, also known as Guinness Hop Store) is a Guinness-themed tourist attraction located at St. James's Gate Brewery in Dublin, Republic of Ireland. Since opening in November 2000 it has attracted over 4 million visitors. The Storehouse is laid out over seven floors surrounding a glass atrium shaped in the form of a pint of Guinness. The ground floor introduces the beer's four ingredients (water, barley, hops and yeast), and the brewery's founder, Arthur Guinness. Other floors feature the history of Guinness advertising and include an interactive exhibit on responsible drinking. In 2006, a new wing opened incorporating a live installation of the present day brewing process. The seventh floor houses the Gravity Bar where visitors can claim a complimentary pint of Guinness and enjoy panoramic views over Dublin City. The Storehouse building dates back to 1904 and was built in the style of the Chicago School of Architecture. It was the first multi-storey steel framed building to be constructed in the British Isles. In brewing terms, ¿Äòto store¿Äô means to add yeast[citation needed], giving the Storehouse its name. It was once the fermentation plant of the Brewery, where the fourth ingredient yeast, was added to the brew. The building was used continuously as the fermentation plant of the Brewery until its closure in 1988, when a new state-of-the art fermentation plant was built elsewhere on the Brewery site. In 1997, it was decided to convert the building into Guinness Storehouse, the Home of Guinness, replacing the Guinness Hopstore as the Guinness visitors centre. The award-winning redesign of the building was undertaken by the UK-based design firm Imagination Ltd in conjunction with the Dublin-based architects firm RKD, and opened to the public on 2 December 2000.