"Core and Shell" refers to a type of commercial real estate development where the basic structure of a building is completed, but the interior spaces are left unfinished. This approach allows tenants to customize their spaces according to their specific needs. The "core" includes essential elements like elevators, stairwells, and restrooms, while the "shell" encompasses the exterior walls and roof. This method is popular in urban areas, as it provides flexibility for businesses to create unique environments. Developers often market these properties to companies looking for tailored office solutions, making it an attractive option in the competitive real estate market.