'X' logo installed atop Twitter building, spurring San Francisco to investigate permit violation

https://lemmy.world/post/2414586

'X' logo installed atop Twitter building, spurring San Francisco to investigate permit violation - Lemmy.world

Wouldn’t this building be Elon’s property, what stops them from changong their own markings as they please? (I’m not familiar with American property stuff.)
Generally there are rules for what can be placed as a sign on a building.