You can't be serious. He discussed it often during his campaign.
Here's an article from today.
Mayor Zohran Mamdani appointed five new members and reappointed one to the city’s Rent Guidelines Board on Wednesday — a move that gives his selections a
www.amny.com
There is also one in today's New York Times. I can't link it because I'm not a subscriber so I can't access it behind the paywall.
He just loaded the board with his socialist buddies. They'll be extending the rent freeze to additional buildings. It's what socialists do.