He continued the work begun by his father in the Plaza de España. Coullaut-Valera Mendigutia finished the monument in this square between 1956 and 1957.
A statue of Charles III of Spain by Coullaut-Valera stands in Olvera Street, Los Angeles. It was presented in 1976 and dedicated by Juan Carlos I of Spain and Sofia of Spain in 1987. Charles had ordered the founding of the town that became Los Angeles.
- Montoliú, Pedro (16 June 2014). "Edificio Metrópolis: Una de las imágenes icono de Madrid". Madridiario.