Throughout the 20th century, several factors contributed to Buenos Aires’s architectural significance. In the early decades of the century, when Buenos Aires was the capital of one of the wealthiest countries in the world, architects were commissioned to design luxurious residences and institutional buildings, many influenced by French and Italian styles. Later, different immigrant groups looking for status constructed important examples that followed European traits of Viennese secession, Italian liberty, and Catalan modernism. The rationalist architecture of the early 1930s and 1940s in Buenos Aires is one the most significant of the world. This era of architecture greatly influenced the present profile of the city. Also relevant are the examples of Brutalist architecture. The last decades of the century have been characterized by an interest in preserving this rich architectural heritage and by new architectural interventions related to the existing urban fabric. Buenos Aires is sit...