The private ceremony, administered by New York Attorney General Letitia James, a political ally, took place at the old City Hall station, one of the city’s original subway stops that is known for its stunning arched ceilings.
In Mamdani's first remarks as mayor, he said the old subway station was a "testament to the importance of public transit to the vitality, the health and the legacy of our city" as he announced the appointment of his new Department of Transportation commissioner, Mike Flynn.