Photo de stock - Office buildings at AZCA financial district. Madrid, Spain. Located next to Paseo de la Castellana, AZCA complex was completed in the 90â. . s inspired by the Rockefeller Centre in New York. Many professionals, office workers and shoppers pass daily through this area with the most important skyscrapers in the city. With its 107 meters high and 28 floors, Castellana 81 skyscraper is one of the most important architectural landmarks in the city built in 1981 by architect Sainz de Oiza as the BBVA Bank headquarters. It was renovated in 2015 to become an energy efficient building and was granted with the LEED (Leadership in Energy and Environmental Design) green building Platinum Certification or its environmental responsibility and efficient use of the resources.