It’s for both aesthetic and practical reasons.
Aesthetically it looks stylish, and allows for a lot of options for colors and tinting. It also makes the offices inside more desirable when they have big windows with nice views and lots of natural light.
Practically glass is lighter and easier to install and maintain than a lot of other cladding materials. Skyscrapers also almost always carry their weight on internal support beams so structural strength isn’t a big concern for the exterior walls.
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