Which category of buildings includes those constructed off-site and assembled on location?

The correct answer identifies a category of buildings known for being constructed off-site and then assembled at the final location. This process is commonly referred to as modular or prefabricated construction. Buildings in this category are manufactured in a factory setting, which allows for greater precision, efficiency, and reduced construction time compared to traditional construction methods. Once the individual components are ready, they are transported to the construction site where they are assembled into the final structure.

This approach can encompass a variety of building types, including residential homes, office buildings, and even commercial spaces. The key characteristic that defines buildings in this category is the combination of pre-manufacturing and on-site assembly, providing benefits such as increased quality control and potentially lower costs.

The other options represent different kinds of buildings but do not specifically focus on the method of construction involving off-site assembly. Public facilities may refer to buildings such as schools or libraries, luxury estates generally denote high-end custom homes but do not pertain to the construction method, and custom-built homes can be constructed on-site rather than off-site. Thus, the option that best describes buildings constructed off-site and assembled on location is indeed the one that emphasizes this off-site fabrication and on-site assembly process.