The building built by Cèrsar Martinell consists of a large rectangular nave, for vats and processing room, and a porticoed body, attached to one side of the main façade, without a dividing wall, where underground tanks, hoppers and the reception dock were installed. To cover the building, flat brick vaults were used, in the shape of an eggshell with three thicknesses of tile and arranged at different levels to leave openings between them. These vaults were plastered with Portland cement, like those in Gandesa. These vaults were also used as platforms to support the surface tanks, distributed in two rows on each side of the ship. The roof rested on large parabolic arches with eaves relieved by pilasters that covered the lower vaults.
The façade was formed by a large blind parabolic arch, on the ground floor of which the door opened in a lowered brick arch, while on the opposite façade there was a large window with five vertical openings and closed in a raised arch.
Located to the west of the monastic complex, this winery, commissioned to the architect Cèsar Martinell, was built from 1921. Already in 1916, the Agricultural Union and Caixa Rural had been founded. In January 1921, the Sant Medir Winery Union and Caixa Rural was founded, made up of tenants, sharecroppers and middle owners. The architect designed a large cellar of which, however, only a part was built and he left the rest for later.
In 1936, the winery had to merge with the other cooperative entities of the town. In 1939, when the national troops entered, the union's patrimony was confiscated, which was not recovered until 1945 under the name Cooperativa Vitivinícola de Sant Cugat del Vallès. The decade of the 1950s meant the maximum splendour of the winery, in which the maximum production of wine was reached. In the Martinell building, three naves had been added without any architectural interest. From the 1960s, the organisation took a step back, becoming a bottling and marketing plant for various agricultural products. This went on until 1992, when part of the old Martinell winery was ceded to the city council. In 1994, the three new naves were demolished.
