I forget what the effect is called but when some new technology or industry becomes the dominate method or form of productivity it tends to cause other areas of industry to suffer. Partly due to brain drain from previous industry X to new industry Y. It's also just that people think Y is newer and worth more so more time and energy gets moved from X to Y.

In the 20th century, new building materials was one of the new technologies of the day so it makes sense that a lot of time and energy was spent doing things related to buildings/construction. The end of the 20th century and the 21st are dominated by technology and software being the growing method of productivity. Plus now we have software and math that (probably) shows moving a building 90 degrees is going to cause 10 new problems we didn't even consider in the 20th century.

It's all about opportunity cost. In the 20th century we built a ton of buildings that stored and manipulated giant volumes of paper documents and physical files. Now we have databases and virtual filesystems so we don't need giant clerk offices or document storage buildings. Giant data-center buildings might be the most apt comparison on some level.