Ghost as a measure of prestige; as a link (and consequent validation) with the prodigious (and imaginary) past. So even a building pretending to be a ruin (but never actually be a ruin: it did not fail, it was not ruined) provides that validation, but only if its pretence is not attended to? (at least until historical irony can be permitted?).
But ”[a]t bottom, the specter is the future, it is always to come, it presents itself only as that which could come, or come back.” (Derrida: 1994; 39 via Half Lives; must track down copy of book).