Madrid recently acquired a work by Viennese architect Hans Hollein, but it is a building that cannot be seen. The prestigious Austrian architect, who won the Pritzker Prize in 1985, has come to Madrid thanks to Banco Santander, whose Madrid headquarters consists of three buildings – one on Paseo de la Castellana, another on Calle del Marqués Villamejor, and another on Calle Ortega y Gasset – which could not be modified externally because they are part of the Special Plan...[+]