If they tell you, then, See, [the Messiah] is here, in the desert, do not be stirred up; if they tell you, See, he is there, in hidden places, do not believe them.
Mt. 24: 26.
The hidden places are the ταμεῖον, which is defined functionally as a place that is one’s own or personal. Luke uses the same term in “Whatever you say in the ταμεῖον shall be shouted from the rooftops”. In other words, it is the opposite of “public space” or “common space”.
And so false Messiahs will come either from outside the city or from spaces closed off from public view.