Introduction to the main building: The ground floor of the main building contains the diplomatic reception hall, library, map room, porcelain room, gold and silver room, and White House management staff offices. The second floor is the residence of the president and his family. Each floor has some rooms carefully decorated by a certain president at that time. They are now called the Green Room, Blue Room, Red Room, etc., and they are named according to the decorative characteristics of the interior.