So at the time of construction I imagine the techniques used to make a building look like some kind of classical architecture while actually being a facade on t

So at the time of construction I imagine the techniques used to make a building look like some kind of classical architecture while actually being a facade on top of a steel skeleton must have been fairly new and experimental. Was the maintenance story perhaps just not well thought through at design time? It seems almost impossible to simultaneously design a building with recently developed construction techniques, to achieve such an impressive looking result, and to also nail any reasonable maintenance strategy as part of the design.