The four towers are the tallest skyscrapers in Madrid and Spain, all nearly 250 meters tall. Designed by Pei Cobb Freed & Partners, the Space tower was the first one to be completed in 2007. Cristal tower by Cesar Pelli and PwC tower by Carlos Rubio Carvajal + Enrique Álvarez- Sala followed in 2008. Norman Foster designed the 45 floor Caja Madrid tower, the tallest of the four buildings in the complex, built in 2009. (PG)