Famous modernist architects such as Walter Gropius, Richard Neutra and Oscar Niemeyer all passed through the city, while strong influences can be seen in Havana at this time from Le Corbusier and Ludwig Mies van der Rohe. The Edificio Focsa (1956) represents Havana's economic dominance at the time. This 35-story complex was conceived and based on Corbusian ideas of a self-contained city within a city. It contained 400 apartments, garages, a school, a supermarket, and restaurant on the top floor. This was the tallest concrete structure in the world at the time (using no steel frame) and the ultimate symbol of luxury and excess. The Havana Riviera Hotel (1957) designed by Igor B. Polevitzky, a twenty-one-story edifice, when it opened, the Riviera was the largest purpose-built casino-hotel in Cuba or anywhere in the world, outside Las Vegas (the Havana Hilton (1958) surpassed its size a year later).