Avenida dos Aliados is Porto's grandest and most elegant avenue. Developed towards the end of the 19th century to assert Porto's status as a modern city the main square here is flanked with a mix of with art-nouveau, art-deco, Belle Époque and classical buildings. Many of these fine buildings wer, and still are, bank headquarters.
This particular tower sits on the BBVA building (Edifício BBVA) which occupies one of the corners at the foot of Praca da Liberdade. Banco Bilbao Vizcaya Argentaria are one of the biggest financial institutions in the world and their national HQs tend to occupy some very fine buildings.