Mayor Mamdani filmed a video in front of the most expensive penthouse ever sold in the United States to celebrate a new tax on luxury second homes. It went viral, and the city's billionaires were not happy. WNYC reporter Elizabeth Kim takes us from Billionaire's Row to Fordham Road in the Bronx to speak to New Yorkers about the fight to tax the rich.

Photo: Michael Lee/Moment via Getty Images

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