The classification standard of second-class high-rise buildings is mainly based on the height and use of buildings. For residential buildings, the second-class high-rise buildings refer to buildings with a building height between 27 meters and 54 meters. For public buildings, the second-class high-rise buildings refer to non-single-storey buildings with a building height between 24 meters and 50 meters, including office buildings, shops, hotels, cultural and entertainment places, bookstores, libraries, exhibition halls, gymnasiums, hotels and so on. Some specific types of buildings, if their building height exceeds 24 meters, also belong to the second-class high-rise buildings. These buildings include medical buildings, independently built nursing facilities for the elderly, and important public buildings (such as provincial TV stations, finance and trade, finance, etc.). ), a library with a collection of more than 6,543,800 books, and a disaster prevention command and dispatch building at or above the provincial level.