The Telefónica Building, in Spanish Edificio Telefónica, is a skyscraper in Madrid, Spain, which serves as the registered office of the namesake telecommunications company. It is located in Gran Via 28. At the time of construction it was the tallest European skyscraper with 89 m of roof height, until in 1940, when the Terrazza Martini Tower opened in Gen…The Telefónica Building, in Spanish Edificio Telefónica, is a skyscraper in Madrid, Spain, which serves as the registered office of the namesake telecommunications company. It is located in Gran Via 28. At the time of construction it was the tallest European skyscraper with 89 m of roof height, until in 1940, when the Terrazza Martini Tower opened in Genoa.