On 14 December 1935 the San Isidro Club was established in the "Quinta Pueyrredón" of San Isidro (nowadays a museum, it had been built in 1790 by Juan Martín de Pueyrredón as the place to spend his vacations. The owners rented it to the founding members for one year). The colors of the San Isidro Club were also approved in the meeting, being chosen the same colors than CASI: white, light blue (worn by the defunct football team during the amateur era and black.