ELAD PROPERTIES, the Israeli company that bought the Plaza Hotel in New York in 2004, eliminated 500 of the hotel’s 800 rooms in favor of expensive condominiums. But if the company has its way, the number of Plaza Hotel rooms — worldwide — will eventually be in the thousands. Elad and its president, Miki Naftali, are planning Plaza hotels in London, Las Vegas and Shanghai, among other cities. The Las Vegas Plaza, which is expected to include some 3,000 rooms, may be the first one to be built. Last year, Elad, which is controlled by the Israeli billionaire Yitzhak Tshuva, bought 35 acres on the Las Vegas strip, across from the Wynn casino resort, for $1.2 billion, with another Israeli company. The partnership then demolished the New Frontier, the 1,000-room hotel and casino that had occupied the site for half a century.