New York City mayor Zohran Mamdani introduced a new pied-à-terre tax in a video on Wednesday, standing in front of a limestone tower on Central Park South and calling out one of its residents, Citadel CEO Ken Griffin, by name. Griffin is far from the only billionaire who would shoulder such a tax, which Mamdani and New York State Gov. Kathy Hochul proposed earlier this week. The levy on non-primary homes worth more than $5 million would apply to those who live abroad, in other states, and