A highrise apartment building is often referred to as a towering edifice. It may also be called a skyscraper or a multi-storey complex. A high-rise structure may also be referred to as a high-density building, due to the concentration of residents in a relatively small area. Some other synonyms may include a vertical dwelling or a tall residential complex. Such buildings, popular in urban areas, may also be called urban towers, residential towers, or simply towers. Whatever its label, a high-rise apartment building is an easily recognizable sight in most cities, and its presence often signifies the rapid growth and modernization of urban areas.