[7] Among the projects he authored in the 1920s: the France Station in Barcelona (1923),[8] the Palacio de la Prensa in the Gran Vía (1925),[8] the 40-metre high monument to the sacred Heart of Jesus in Bilbao (topped by a sculpture of Lorenzo Coullaut Valera)[9] or the housing project for the Plaza de Rubén Darío (1929).

[11] During the Second Republic he authored some markets, such as Santa María de la Cabezas's (1933) or Maravillas (1935).

[8] After the outbreak of the Civil War in 1936, Muguruza fled from the Republican area and joined the Francoist side.

[13] In June 1939, only 3 months after the Francoist victory in the war, he presided over the Assembly of architects in Madrid, setting the ideological foundations behind the architecture of the new regime.

[16] Muguruza and his disciple Diego Méndez were the architects who designed the Valle de los Caídos;[17] they aimed to make the site an eternal metaphor of the regime's ideology.