The ten-story block is subdivided into four aisles to allow for a stair, three elevators and a brick wall down the middle which further subdivides the block into two apartments. The two apartment blocks to the east and west, have a line of structural columns running down the middle which in turn subdivide the apartment. An interior public corridor runs perpendicular to the three blocks, parallel to Calle 13, and links to the stair and three elevators. There is secondary stairs near the east entrance with windows at every landing. There were no fire stairs required by the Havana building code. The four luxury tower apartments were occupied by José Antonio López Serrano who lived on the top floor, it was later occupied by Eduardo Chibás. The exterior walls are brick with one inch, integral color cement plaster finish. There are raised plaster ornaments on the exterior walls and inscribed lines in the plaster suggesting a masonry bond in the lower part of the wall. There are also terracotta design panels inserted over some of the openings. All the windows and doors of the building are wood and glass in a wood frame. The floor of the apartments are covered with tiles with red and green geometric designs, there are tile baseboards. The interior walls are terracotta tile and covered in cement plaster. The floor of the lobby, the porch, and entrances to the building have ornate designs in red and black or red and green terrazzo. The walls of the lobby are Moroccan, book matched, red marble panels.. There is a nickel-silver relief El Tiempo (‘Time’) by graphic designer Enrique García Cabrera on the elevator wall of the lobby. The elevator doors are pivot hinged and originally were nickel silver with various Art Deco designs. As per Havana zoning laws, the ground floor was required to have a porch facing 13th Street. It also had to provide public, commercial establishments. To this end, the building had various stores, a barbershop, restaurants and coffee shops. The distribution of the upper floors is as follows: from the second to the tenth floor, the building has eight apartments per floor, six with a separate service entrance opening directly into the kitchen and service area. Each apartment has access from the kitchen to what is called in Havana a "patio" (dark blue), this is an area equipped with a sink for doing laundry. A similar room labeled a patio can also be found in other modernist buildings such as the FOCSA Building of 1956 and the apartments at the Edificio del Seguro Médico of 1958 on La Rampa.