1 concept.
The main building and the annex form a pair of concepts. The main building is a landmark building, and the annex building is a subsidiary building of the main building. The skirt building refers to the affiliated building at the bottom of the whole building, which covers an area larger than the main building, that is, the skirt building is wider than the main building, just like the skirt part of a skirt, generally 2~3 floors.
2. Scope.
The main building is a whole tall building, and the skirt building is the low part of the whole building. The scope of the two is not the same. On the whole, the building where the podium is located presents a convex shape. But there is no fixed shape between the annex next to the main building and its shape. There can be one annex or two annexes, which are arranged around the main building.
3. Floor space.
The floor space of the main building can be larger or smaller than that of the annex, and the area of the annex can also be the same as that of the main building. The podium covers an area larger than the main part of the whole building, which embodies the characteristics of "width" in the main part.
4. Function.
If the area where the main building appears is a residential area, then the main building is a residential part, and the annex building has certain commercial and entertainment functions, and is an additional functional area of the main building, which enhances the functionality and convenience of the area. Accessory buildings can also be residential buildings. The skirt building is arranged at the bottom of the whole building, and its function should be different for different building subjects, and it can be used as a shopping mall, restaurant or leisure place.