This project is a cad drawing of a central commercial building in a city, which includes a plan of the second underground floor, a plan of the first floor of the second section, a north-south elevation of the first section, a plan of the roof of the first section, a side elevation, a section, a detailed civil air defense drawing, etc. The drawings are complete in content, clear in expression, and precise in drafting. Designers are welcome to download and use them.