Facing Shemshak ski resort, this project is located on a steep hill in the mountainous Shemshak region of Tehran with approximately 32m elevation difference throughout the site. The main consideration was to design in harmony with the special weather condition of Shemshak and to optimize view and sunlight penetration in each unit. The building regulation in Shemshak region indicates that the existing slope must be considered in the design and the view from the road to the ski field must not be blocked in at least one part of the building. The final geometrical system was created following the longitudinal divisions through the site. The volumetric modules were arranged on the slope to create voids for better sunlight penetration. These voids bring south sunlight in and create small courtyards inside the lower units. Similar to a greenhouse, these courtyards provide natural heating during the winter. During the summer, these voids become semi-open spaces with natural ventilation. The volume of the project was formed to create a variety of unit typologies, resulting in a total of 13 units ranging from 50m2 suits to 600 m2 triplex units, all having balconies facing the ski trail. Depicted from the common roof typology in the region, gable roofs were used on every module. Local stones were used as a two-ply enclosure forming both the exterior envelope and the interior finishing. This system allows for sunlight penetration and ventilation while preventing overlook from the adjacent units. On the rooftop, there are cavities in between the stone layers for easier drainage of the melted snow to the gutters underneath the exterior enclosure.