First Atletico's ground, 'Ronda de Vallecas', was situated in the homonym working-class area south of the city. In 1919, the Compañía Urbanizadora Metropolitana—the company that ran the underground communication system in Madrid—acquired some land, near the Ciudad Universitaria. As part of that project the company built a sports stadium, named Estadio Metropolitano de Madrid. With a capacity for 35.800 spectators, in 1923 it was rented by Atlético de Madrid, which used it until 1966 when they moved to the new Estadio Vicente Calderón. After the move, the Metropolitano was demolished, being replaced with university buildings.