Starting in 1916, he decorated the auditorium of the Ateneo in Montevideo (with Horacio Azzarini), and refurbished José Enrique Rodó high school and several houses.
He also received second prize in the competition for the headquarters of the Banco de la República Oriental del Uruguay and the Felipe Sanguinetti school building.
His project, "Palace to serve as headquarters of the League of Nations" won the Grand Prize, which provided the funding for study abroad.
He visited many European countries such as Netherlands, Italy and Greece, but spent most of his time moving between France and Spain, working for a construction company in Paris.
[citation needed] Some of the highlights of this work are the Palacio Santa Lucia, the Giacomo Pucciarelli apartment blocks, the Augusto Pérsico and the Felipe Yriart residence.
In October, he was awarded first prize for the Centro de Almaceneros Minoristas project, a complex of apartments, shops, offices and a movie theater.
[3][5] This was a time of transition when Vilamajó began to move from a historical to a humanist standpoint, seeking to balance logic and rationality in his construction projects.
[citation needed] In 1936, Vilamajó won first prize, along with sculptor Antonio Pena, for the Monument to the Peoples' Confraternity project in Buenos Aires.
"[citation needed] In 1942, Vilamajó began teaching project subjects for 4th and 5th years at the School of Architecture, after the demise of long-time teacher, Joseph Carré.
He selected G. A. Soilleux (Australia), M. Nowicki (Poland), J. Havlicek ( Czechoslovakia), P. Noskov (U.S.S.R.), and Vilamajó from the original group of consultants and advisors.