An apartment building is a multi-unit residential building that typically houses several individual living units, such as apartments or condos, within one structure. These buildings can range in size from small, multi-unit structures to large, high-rise buildings that house hundreds of residents. Apartment buildings are typically designed to maximize the number of units in a given space, and they often feature shared amenities, such as elevators, laundry facilities, and communal spaces. They are a popular choice for city dwellers and those who prefer to live in close proximity to work, shopping, and other amenities.