With the rapid development of social economy, many high-rise buildings in modern cities have become forests of steel and concrete  However, there are almost no high-rise buildings in a famous city in Europe, and a tourist knows that there are only 100000 people in the city
As a result, he believes that the sparse population and sluggish demand are the main reasons why the city does not build high-rise buildings
The city has planned to build a high-rise landmark building within three years.