The need for increased space in the large cities, and a lack of available land, made the high rise a universal solution.

Multi storied buildings, usually with many windows, simple in lines and without many deviations of shape made for an economical, efficient, bright and popular solution to the space need.

This style became popular in most every major city in the world, so that if you travel from one city to another, you will see a similar look to the city cores that have become the 'look' of the conservative style.

In the twentieth century, there has not been a more popular building style

Calgary is a perfect example of a city in which the majority of the city core is all conservative style, high rise buildings

Quick to build, cheap by modern standards, efficient and easily disposed of when the time comes. 

The perfect solution in a disposable society