Buenos Aires has officially 48 community districts. Many of them are further subdivided into sub-barrios whose names often reflect famous buildings in these subzones. Once is one of these rather unoffical neighborhoods. It is basically a part of the Balvanera barrio but hardly anyone uses this denomination. Once's namesake is the massive Once de Septiembre train station. The Spanish word once means "eleven". The train station was named after Buenos Aires' rebellion against the Federal government on September 11, 1852. So don't get confused, it has nothing to do with the 9/11 terrorists attacks in the US.
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