The building known as Casa Bonaventura Ferrer is a modernist building located at number 113 Passeig de Gràcia (in the Jardinets), designed by the architect Pere Falqués i Urpí and built between 1905 and 1906.
This building, originally a residential building, occupies a plot between Passeig de Gràcia (no. 113) and Riera de Sant Miquel (no. 6), where there is a much smaller building, with a single floor and ground floor and very different formal and chronological characteristics. The main house facing Passeig de Gràcia has five levels of elevation (ground floor, main floor, three floors and a roof with a rooftop that can be walked on) and a basement.
The main façade stands out for its decorative and sculptural elements. Compositionally, three vertical axes can be distinguished, the central one being the most relevant both for the type of structural elements it incorporates and for its sculptural and decorative richness. In this sense, the sculptural decoration of the entrance door to the property – located on one of the lateral axes – and especially the central window on the ground floor and the tribune on the first floor stand out. The window located on the ground floor is at the height of an intermediate level, most probably modelled on the windows in the studios of the great urban mansions of Barcelona in the 16th and 17th centuries, known to Falqués. The profusely decorated window sill is in the form of an Ionic capital with large volutes and acanthus leaves, in the centre of which is a small opening that corresponds to the ventilation of the basement level. A powerful structure with overlapping cantilevered and sculpted cantilevered corbels forms the lintel of the window and serves as the base of the balcony on the main floor. This tribune is one of the most characteristic elements of the façade, with a large window which, taking as a reference the medieval colonnade windows with a central mullion, reinterprets the model with a larger staircase and a large central column. This column incorporates iron elements in its shaft and capital, a material also used in the balcony railings and window frames. This gallery protrudes considerably from the façade's plumb line, which allows for the development of a cantilevered balcony on the first floor. From the first floor onwards, the cantilevered balconies disappear and give way to enclosed balconies.

The rear façade of this main building has unique galleries with a semi-circular structure of wood, iron and leaded glass that is truly remarkable. As already mentioned, on the façade line of Carrer Riera de Sant Miquel, the building has a ground floor and first floor, covered with a flat, walkable roof.

The main access to the Passeig de Gràcia is through a large doorway – which still preserves the original wooden door – through which one enters a first vestibule of small dimensions with steps leading to another, larger vestibule, where the staircase leading to the upper floors is located. The staircase's iron railing, which also incorporates an iron and glass light, stands out. The rest of the wall lights located in the vestibule take up the same idea. The staircase located in this foyer gives access to the upper floors (from the main floor upwards) which are currently used as luxury rental flats.

The ground floor is probably one of the most important areas of the building from a decorative point of view. The space currently known as the ‘Passeig de Gràcia Hall’ is covered with a polychrome wooden ceiling and vegetal tracery, while the space below is covered with a moulded plaster ceiling, polychrome and occasionally gilded.

But the most characteristic space of the building is undoubtedly the large central area located in the centre of the ground floor which, recovering the function of the old medieval and baroque open courtyards, acts as a distributor of the ground floor spaces and gives access to the main floor. This space, covered with a skylight structure with polychrome leaded glass windows, connects the ground floor with the first floor via a noble wooden staircase that is included within a large structure, also made of wood of great technical and decorative quality, where plant motifs surround the space, especially in the staircase railing and the first-floor gallery. This gallery surrounds the entire first floor, where there are two large rooms, the ‘Salón del mirador’ and the ‘Salón de los Vitrales’, both covered with polychrome and golden plaster ceilings in the modernist and deco style. The carpentry and wall lights, which have been preserved and are present in many areas of the estate, are particularly noteworthy.

Also on the ground floor is an area known as ‘The Conservatory’, a semi-circular space covered with an iron structure and stained glass windows that creates a very wide and bright conservatory-like room. This space is accessed through a hall characterised by the magnificent woodwork both on the doors and on the carved and polychrome wood ceilings with plant motifs that follow other models present in the building.

The rest of the upper floors are nowadays adapted as luxury flats for rent.

The basement floor, currently empty and adapted to the new uses of the building (social and cultural events), stands out for the brick pillars that support the flat brick vaults, creating a very diaphanous space that contrasts with the original uses: the old kitchens, charcoal piles and service rooms.