Which of the following best describes common elements in a shared building?

Common elements in a shared building refer to the areas and facilities that are accessible to all residents and are not individually owned. Hallways and elevators are prime examples of these common elements, as they provide means of access and movement throughout the building for all occupants.

In most multi-unit residential structures, common elements facilitate the functionality of the building as a whole and contribute to the shared living experience. They are designed for everyone's use, differentiating them from private units, which are individually owned spaces, or individual parking spots, which are often designated for the use of specific owners or tenants. While the roof and exterior may also represent common elements, they do not encompass the full range of shared resources available to residents, as hallways and elevators are integral to daily life and mobility within the building.

Thus, highlighting hallways and elevators as common elements accurately reflects their role in fostering shared spaces within a building, making option C the best description of common elements in this context.