The 7-1 vote by the city’s Rent Guidelines Board set increases at zero on both one-year and two-year leases from October. Hundreds of tenants who crowded into a Manhattan museum auditorium cheered and blew whistles at the result.

“This is a historic victory for New ​York City tenants,” Mamdani said in a statement. “This is the relief that working people across our city deserve.”

The vote was ​the culmination of a weeks-long, noisy annual ritual that determines how much landlords can increase what they charge ⁠for rent-stabilized apartments, home to about a quarter of New Yorkers. The board weighs factors including wages, inflation, maintenance costs, taxes and ​landlords’ incomes.

The average monthly rent for a regulated apartment was $1,599, according to the board’s 2025 study, opens new tab, in a city where the median rent for ​a newly leased apartment is $3,950, according to listings agency StreetEasy.

Mamdani, a democratic socialist who has promised to make the city more affordable, has appointed six of the board’s nine members since he took office in January, choosing people he believes are sympathetic to tenants.

But hours before the vote on Thursday, a ​member representing landlords said this amounted to stacking the board and resigned, accusing the body of not following its obligations under the ​law to be unbiased.

In resigning, Christina Smyth, an appointee of Mamdani’s predecessor and one of two landlord representatives on the board, said the outcome ‌had ⁠been predetermined by the mayor.

“The rebuilt board was required to deliver a rent freeze,” she said. “Everything since has been theater.”

Board Chair Chantella Mitchell, a Mamdani appointee, said the board’s members and staff served with independence and integrity.

The other landlord representative on the board, Mamdani appointee Maksim Wynn, was booed by tenants as he read a lengthy statement before the vote.

But the crowd’s anger turned to delight when he wrapped ​up several minutes later and ​voted in favor of the ⁠freeze.

At public hearings in the run-up to the vote, tenants demanded a rent freeze, something that happened three times under Mayor Bill de Blasio between 2015 and 2021 for one-year leases only, or even a rent ​decrease, saying incomes were not keeping up with inflation and soaring bills.

Landlord groups contended a rent freeze ​would only make ⁠it harder for property owners to maintain their buildings and said some were not able to cover their mortgages.

Some landlords, from “mom and pop” owners of a single building to wealthy private equity investors, say they are forced to hike rents on unregulated, market-rate apartments to recoup losses on their rent-stabilized ⁠units.

After his ​election, Mamdani moved from a roughly $2,300-per-month one-bedroom rent-regulated Queens apartment to the mayor’s ​five-bedroom official residence in Manhattan.

Thursday’s vote extended Mamdani’s successful week.

He also celebrated the victory of all three left-wing candidates in hotly contested races to become Democratic Party nominees ​for New York seats in the U.S. Congress.