Actually, generically speaking, eye-grabbing tall/supertall densification is probably the *best* alibi for replacement: go big or go home, IOW. Otherwise, if it's just going to be something humdrum of more or less the same scale or a titch larger (much less a total reclad/remodel a la the Westbury), why bother. Stick with what's there and bow to the appreciative defence team; it's a sensible, prudent, and disarmingly positive path to follow. And brush aside those who reflect the Dunning-Kruger school of architectural appreciation.