Also known as Casa del Arco, the Sanabria Murillo Apartments consist of two duplex residential units whose exterior volumetry results from a rigorous geometric exercise rooted in square-root-of-two proportional systems. Multiple subtractions from the base rectangular volume generate depth, climatic protection, and varied lighting strategies. A large arch unites the two dwellings — a single formal gesture symbolizing two families under one roof. The rotated central element that emerges from this operation becomes the dividing volume between the apartments while simultaneously guiding visitors to each entrance.

The facade establishes a dialogue between washed concrete and brick, creating an image legible from a distance as a clear iconic presence, but one that rewards closer reading with the full system of relationships underlying the building’s articulation.

Internally the program distributes across five sub-levels, extracting maximum value from the site’s existing topography. A zigzagging wall divides the two units in plan while introducing small differences between them — a deliberate strategy to give each unit its own identity within the ensemble. Each apartment organizes around a central patio, the spatial protagonist of the project and a theme of sustained exploration in Beer’s work. Light, texture, vegetation, geometric order, and the choreography of internal circulation are layered as independent systems, proposed by the architect to interact and produce unexpected spatial reactions. The interior light dynamic, intensified by timber screen materiality, generates shifting shadow patterns throughout the day.