 Complete the following phrase:  Monterrey played their home matches at the Estadio Tecnológico from 1950 to 2015, though for a period of time from 1973 to 1980 they played at the Estadio Universitario, the stadium was opened on July 17, 1950 by Mexican president Miguel Alemán Valdés, it was the second oldest football stadium in Mexico, after Estadio Azul. The stadium was a part of the 1986 Mexico FIFA World Cup which could hold 38,000 people, and served 4 matches within the tournament but, in July 2017 the stadium began to be demolished.In 197778, with preparations for the 