Cuatro Torres Business Area (CTBA) is a business district located in the Paseo de la Castellana in Madrid (Spain), on the former Ciudad Deportiva of Real Madrid. The area contains the tallest skyscrapers in Madrid and Spain (Torre Espacio, Torre de Cristal, Torre PwC and Torre Caja Madrid). The construction of the buildings finished in 2008. The complex was formerly known as Madrid Arena.
Torre Espacio is 224.5 metres (736 feet) tall and has 57 floors. In November 2006, its height surpassed that of the Gran Hotel Bali, thus making it the tallest building in Spain, although it retained that title only for a short time (see below). The structure was topped out on March 19, 2007. On the night of that day, Alberto Ruiz Gallardón, mayor of Madrid, attended a ceremony with fireworks to commemorate the event. It was designed by Henry N. Cobb and built by Obrascón Huarte Lain.