Other notable projects of Álvarez's in subsequent years included the Hernandarias Subfluvial Tunnel (completed in 1969), the Colón Opera House's labyrinthine production facilities (1972), the Buenos Aires headquarters for the state steel concern, Somisa (1977), the Salto Grande Dam (1979) and numerous office buildings, including the Buenos Aires Stock Exchange annex (1977) and the offices of IBM's Latin American division (1980).

[3] He also became a leading designer of residential and hotel properties in Punta del Este, a Uruguayan seaside city popular among Argentine vacationers.

Some of his best-known designs from this era include the Chacofi building, the Buenos Aires American Express offices (facing San Martín Plaza), and the Costa Galana Hotel (Mar del Plata).

An economic recovery in the early 1990s resulted in a rush of landmark designs for MRA, including the Rosario Stock Exchange's new building, the Le Parc tower (completed in 1996, the tallest in Argentina until 2003), the Hilton Buenos Aires (1999) and Microsoft's Latin American headquarters (2000), numerous luxury high-rises in the Recoleta and Palermo sections of Buenos Aires, and others.

Other notable recent designs include the new Taravella International Airport (Córdoba) terminal, Torre Aqualina (Rosario), the new Proa Foundation cultural center building and the Bariloche Hilton, built into the mountain rock.