Yea, that's not much of a study. The authors didn't have enough data to really understand why buildings were getting demolished before 50 years. Defining them a

Yea, that's not much of a study. The authors didn't have enough data to really understand why buildings were getting demolished before 50 years. Defining them as "wood", "concrete" and "steel" is far too broad of categories, for one. A steel warehouse that was put up with the lowest cost bid is easy to demolish and rebuild with better, newer materials/technologies after 40 years or so. A state of the art office building is not. How old is the Empire State Building? Do you think it's getting demolished any time soon? Do you really think building construction techniques and materials of 50 years ago are comparable to the techniques and materials used today, especially on the Apple Campus?