The Castro Marim Hotel was designed to be a 4-star rural hotel with 58 rooms, organized into four blocks that form an interior courtyard with various volumetric recesses, creating outdoor living areas and allowing for natural ventilation. The rooms feature large glazed openings facing patios or the exterior, maximizing natural light and visual connection with the surrounding landscape. The façades are clad with gabion-style panels filled with local stone, giving the building a rustic, robust, and natural appearance that harmonizes with its environment.

The building is set on a natural site with predominantly flat or gently sloping terrain and subtle undulations. The proposal was designed to ensure its harmonious integration into the landscape by partially embedding the construction into the ground, creating a semi-underground complex that minimizes visual impact and blends with the surroundings.

The overall layout follows a square shape measuring 70 meters on each side (70 m × 70 m), carved into the terrain. This approach preserves the natural topography and maintains the visual continuity of the landscape, promoting sustainability and respect for the rural setting. Given the absence of architectural references in the surrounding area, and in order to avoid introducing disruptive built elements into the landscape, the design adopts formal minimalism above ground level.