WATCH: Zohran Mamdani's full speech at his NYC mayoral inauguration

NEW YORK CITY - Zohran Mamdani hosted what his team called the "Inauguration of a New Era," a public swearing-in ceremony and citywide celebration on Thursday afternoon.

INAUGURATION UPDATES

• Zohran Mamdani speaks to the crowd outside City Hall. (Michael Stallone 2:45 p.m.)
• Vermont Sen. Bernie Sanders swears in the next mayor of New York City, Zohran Mamdani. (Michael Stallone 2:40 p.m.)

• New York City Public Advocate CWilliams is sworn in. (Michael Stallone 2:16 p.m.)

• New York City Comptroller Mark Levine is sworn in by New York Attorney General Letitia James. (Michael Stallone 1:55 p.m.)

• In opening remarks at Thursday's ceremony in front of City Hall, U.S. Rep. Alexandria Ocasio-Cortez said Mamdani would be a mayor dedicated to the working class that makes New York City run. (Michael Stallone 1:40 p.m.) 

• Zohran Mamdani was accompanied on the stage by his wife, Rama Duwaji. Previous mayors Eric Adams and Bill de Blasio were both in attendance. (Michael Stallone 1:30 p.m.) 

The backstory:

Mamdani became mayor of New York City just after midnight Thursday, taking the oath of office at an historic, decommissioned subway station in Manhattan. Mamdani was sworn in as the first Muslim leader of America’s biggest city, placing his hand on a Quran as he took his oath.

The private ceremony, administered by New York Attorney General Letitia James, 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.

After working part of the night in his new office, Mamdani then returned to City Hall in a taxi cab around midday Thursday for a grander public inauguration where U.S. Sen. Bernie Sanders administered the oath for a second time.

"Beginning today, we will govern expansively and audaciously. We may not always succeed, but never will we be accused of lacking the courage to try," Mamdani told a cheering crowd.

"To those who insist that the era of big government is over, hear me when I say this: No longer will City Hall hesitate to use its power to improve New Yorkers' lives," he said.

NYC mayor inauguration

What we know:

The event featured a formal ceremony on the steps of City Hall, followed by a large block party along Broadway in the historic Canyon of Heroes. Tens of thousands of people were expected, with designated viewing areas allowing the public to watch and participate.

• MORE: Inside Mamdani’s transition team: List of officials
• MORE: Everything to know about the future first lady of NYC
• MORE: Here's why Mamdani will be NYC’s 112th mayor, not the 111th

The expanded celebration marked a departure from tradition. Past mayoral inaugurations were typically limited to about 4,000 ticketed guests inside City Hall Plaza.

For the first time, the public was also invited to gather along Broadway for a citywide block party, a move organizers say was designed to make the inauguration accessible to all New Yorkers.

Congresswoman Alexandria Ocasio-Cortez delivered opening remarks, while Vermont Sen. Bernie Sanders delivered the oath of office.

NYC street closures

Big picture view:

The following streets will be closed at the discretion of the NYPD:

Location(s):

• Broadway between Worth Street and Battery Place
• Liberty Street between Church Street and Broadway

Additional Locations:

• Broadway between Morris Street and Stone Street / Whitehall Street
• State Street between Broadway and Pearl Street
• Church Street between Chambers Street and Trinity Street
• Trinity Street between Church Street and Battery Place
• Theatre Alley between Beekman Street and Ann Street
• Liberty Place between Maiden Lane and Liberty Street
• Nassau Street between Spruce Street and Wall Street
• Dutch Street between Fulton Street and John Street
• William Street between Beekman Street and Wall Street
• Gold Street between Frankfort Street and Liberty Street
• Trimble Place between Thomas Street and Duane Street
• Elk Street between Chamber Street and Reade Street
• Worth Street between Lafayette Street and Church Street
• Thomas Street between Church Street and Broadway
• Duane Street between Church Street and Lafayette Street
• Reade Street between Church Street and Center
• Chamber Street between West Broadway and Center Street
• Warren Street between West Broadway and Broadway
• Murray Street between West Broadway and Broadway
• Park Place between West Broadway and Broadway
• Barclay Street between West Broadway and Broadway
• Vesey Street between Church Street and Broadway
• Fulton Street between Church Street and Broadway
• Dey Street between Church Street and Broadway
• Cortlandt Street between Church Street and Broadway
• Cedar Street between Trinity Place and Broadway
• Thames Street between Trinity Place and Broadway
• Rector Street between Trinity Place and Broadway
• Morris Street between Trinity Place and Broadway
• Battery Place between Washington Street and Broadway
• Center Street / Park Row between Chambers Street and Ann Street / Broadway
• Frankfort Street between Park Row and Gold Street
• Spruce Street between Park Row and Gold Street
• Beekman Street between Park Row and Gold Street
• Ann Street between Broadway and Gold Street
• Fulton Street between Broadway and Gold Street
• John Street between Broadway and Gold Street
• Maiden Lane between Broadway and Liberty Street
• Liberty Street between Broadway and Gold Street
• Cedar Street between Broadway and Nassau Street
• Pine Street between Broadway and William Street
• Wall Street between Broadway and Pearl Street

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