[4] After obtaining the degree on Doctor of Law from the University of Salamanca,[5] he began a similar activity to that of his father, developing business projects in León, where he obtained the concession of a narrow gauge railway in 1900 and through participation in the Railway of the Sociedad Oeste de Sabero.

[1] On 26 April 1903, a Basque colony of students from the Escuela Superior de Minas led by Eduardo de Acha met the representatives of Athletic Club, who had just won the 1903 Copa del Rey Final, to request permission to create the club's Madrid branch, Athletic Club, an idea that was very well received, and thus, Athletic de Madrid was born.

[2][7][8] Despite the insistence of the rest of the founders to elect Acha president, he instead opted for the 32-year-old Allende to become the club's first president due to his comfortable economic situation, thus acting as patron of the club.

[7][8] However, Allende did not meet the expectations that were held of him; he soon got tired and stopped showing much interest in football, so he resigned in the fall of that same year, and Acha assumed the presidency.

[7][9] In 1905 he was elected deputy in Cortes for the district of Riaño (Province of León) as part of the Conservative Party, a position he would hold until 1910.