from The Christian Science Monitor -
A new endangered species: Modern architecture
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When modern buildings become less useful or totally unusable, then does that makes it easier to demolish them, putting aside for the moment that most would also see these buildings as "ugly"? Or perhaps only when such a building has fallen into dereliction, only then can its "preservation capital" start to rise? And adding to that, the inherent ideological thrust of modern architecture does not help a bit:

"Many Modern buildings were designed for a specific purpose – Modern architects value function over form – making renovation for another use even more expensive."