New technologies have allowed buildings to become taller and heavier than ever before. This is an example of:

This is an example of "Skyscrapers".

Explanation:

Skyscraper is a high rise, tall multi storied building of that consist of about 40 floors inside it that is mainly built for the corporate offices, commercial spaces and residential flats. Buildings that are higher than 150m height are known skyscrapers. They have steel or iron framework to its inner side of the building that supports its floor and walls. Skyscrapers are made possible by the process of Bessemer process of mass production of steel beam.