This quartet of business-oriented skyscrapers, completed in 2009, and visible from as far as 60km (40 miles) away, represents the new face of 21st-century Madrid. Their slender steel gray and gleaming glass outlines loom high at the northern end of the Castellana Avenue, beside the Chamartín railway station, dwarfing the nearby KIO Towers. The big daddy is Torre Caja Madrid, a twin-columned edifice of reinforced concrete, designed by the ubiquitous Norman Foster; and, at 250m (820 ft.), it's the biggest building in the city. The Torre de Cristal, designed by Argentinian César Pelli, reaches only 1m (3 ft.) shorter, and the Torre Sacyr Vallehermoso, by Spanish designers Carlos Rubio Carvajal and Enrique Álvarez-Sala Walther, is 236m (774 ft.) high. The latter accommodates a five-star hotel, Eurostars Madrid Tower, whose restaurant enjoys the best views in the capital. The "baby" of the group is the 223m (732-ft.) Torre Espacio.