In 1883, the Ateneu de Canet de Mar society was founded, a social organisation with Catalanist roots. Domènech i Montaner was commissioned to design its headquarters on the most central corner of the town, between La Riera and Carrer Ample.
Domènech made use of part of the buildings that occupied the site he had acquired, and erected a building with a ground floor and a first floor, joining it to the main theatre next door. It had a meeting room, a reading room and library, a meeting room, a billiard room and a triple room.
A continuous balcony reaches the corner, where a tower that starts from the first floor makes it turn towards the façade of the wide street, which is where the entrance was, giving continuity to the two façades.
The façade facing the stream has a clear symmetrical composition with a central body topped with a pediment and a large rose window. The continuous balcony takes on a double flight at this point, supported on metal corbels inspired by the style of Violet-le-Duc.
The façades are finished with decorative stucco work by the prestigious Barcelona firm Saumell i Vilaró. The decorative motifs are mythological allegories, largely taken from Verdaguer's Atlantis. There is also a rich decoration of wrought iron and cut iron plate by the locksmiths Pujadas de Canet.
In 1923, the building housed the Ateneo Obrero (Workers' Athenaeum) and during Franco's regime, the Education and Rest trade union work. In 1985 the building was acquired by Canet Town Council. The interior was completely modified over the years and only the façades remain. Since 1999 it has been the Gual Pujades library of Canet de Mar.

The building has two floors, with façades on Riera de Sant Domènec and Carrer Ample. It has a tower on the first floor, supported from the ground floor by a free-standing column topped at the top by a lantern.

A balcony with a wrought-iron railing runs along the entire building at first-floor level. On the façade of the Riera de Sant Domènec, the balcony takes on greater importance where a large stained-glass window opens up, above which a large rose window can be seen.

The exterior of the Casino was decorated with paintings depicting heraldic motifs, borders and literary references, as well as iconographic elements typical of Catalan nationalism. The latter, in particular, were carried out at a difficult time and are not well preserved.

Located at Carrer Ample, no. 2, on the corner of Carrer de Sant Domènec, the Casino or Ateneu Obrer de Canet de Mar was located at the crossroads of the four most important streets in the town.

The Casino was the headquarters of the Regionalist League and the main exponent of a social, cultural and political revitalisation that characterised an era.

Built by Domènech i Montaner in 1887, it was the headquarters of the Ateneu Obrer until 1939, when it became the headquarters of ‘Education and Leisure’.

The Casino or Athenaeum of Canet is included in the group of Domènech i Montaner's first works, and is somewhat earlier than the ‘Castle of the Three Dragons’ for the Universal Exhibition of 1888. The building has recently been acquired by the Town Council.