Residents in New York City's ritzy Upper East Side have warned Mayor-elect Zohran Mamdani that he will not receive a warm welcome when he moves into Gracie Mansion. The Democratic socialist has announced that he and his artist wife, Rama Duwaji, will say goodbye to their $2,300-per-month Queens apartment after his inauguration in January and relocate to the $100 million abode. The extravagant mayor's mansion sits on 11 acres in Carl Schurz Park in Manhattan's Yorkville neighborhood of the Upper East Side, an area where Mamdani lost the vote. Many residents of the neighborhood voted for Andrew Cuomo, partly because...