Landlords in New York City have apparently picked their champion in the mayor’s race: Andrew M. Cuomo.

Housing for All, a super PAC representing landlords’ interests, announced plans on Thursday to spend $2.5 million on campaign ads to promote Mr. Cuomo — the single largest ad commitment of the election cycle so far.

The donation, which was first reported by Politico, again highlights the outsize influence of super PACs, which allow donors to contribute unlimited sums of money that can be used to promote a candidate as long as the groups do not coordinate with the candidate directly.

In the mayor’s race, Mr. Cuomo has been the prime beneficiary of such money. Another super PAC, Fix the City, has raised roughly $10 million on his behalf, including from companies and individuals with business before the city. The largest donation, $1 million, came from DoorDash, the food delivery service lobbying City Hall on regulations that could disrupt its business model.

The $2.5 million ad buy from Housing for All is funded by the New York Apartment Association, which represents landlords and lobbies city government and the city’s rent-setting organization, the Rent Guidelines Board, on their behalf.

Kenny Burgos, who leads the association, said the goal was to ensure the longtime viability of the housing stock by making sure that landlords had money to maintain their buildings.