It would be very simple and straightforward to issue a no loitering policy. Would its enforcement be necessarily subjective? Of course. Who cares. Show your ticket if asked, and leave if you're a vagrant.

Curated spaces exist in the city, ever wonder why there are basically no vagrants in the Schwarzman building?

Moynihan is awful because we don't have the balls to stand up to the screeching idiots who want to require absolutely nothing from homeless vagrants. Let them do whatever they want.