Buenos Aires: Avenida 9 de Julio.
Vistas de Cuidades Argentinas No 35
(City views of Argentina)
JB left me this message ....
I should point out that the Mirafiori building (which would be in the middle-right of the photo) is missing. Since ground was broken on same in 1961, my guess is that the postcard was made in the late 1950s.