In a metro area of about 6.5 million people, it is surprising Madrid has only thirty high-rises above 200 feet. Two are from the 1950s, most were built at the end of the 20th century and the four tallest were completed before the market crash of 2009. An anomaly among the modern glass edifices is the Torres de Colón. The unique design of these twin office towers by Antonio Lamela is locally called The Plug. The mauve façade and green roof clearly reflects the color scheme of the 1970s when it was built along the Plaza de Colón.