Mayor Zohran Mamdani wants to revive a massive housing development project over a railyard in Western Queens — with major funding help from the Trump administration.

The project, Sunnyside Yard, would consist of 12,000 affordable apartments, with 6,000 of those being in what the administration described as a “Mitchell-Lama-style,” or units created via cooperative and subsidized homeownership.

The project would also include new parks, schools and healthcare clinics, according to City Hall.

Mamdani pitched President Donald Trump on the idea during a meeting at the Oval Office on Thursday, and he is seeking over $21 billion in federal grant funds to construct a platform over the railyard, which serves Amtrak, the Long Island Rail Road and New Jersey Transit.

“The president was interested in the idea and I look forward to the ensuing conversations about how to build more housing in a city that doesn’t have enough of it,” Mamdani said at an unrelated event in Crown Heights, Brooklyn, on Friday.

An artist’s rendering of the projected Sunnyside Yard. Photo: NYC Economic Development Corporation

After the meeting with the president, the mayor posted to social media a photo of himself with the president, who held up two front pages of the Daily News. One was real — a copy of the infamous cover “FORD TO CITY: DROP DEAD” — and the other City Hall had mocked up with a headline that read, “TRUMP TO CITY: LET’S BUILD.”

Mamdani framed the housing development project as part of the solution to meeting the city’s affordability challenge. He touted the proposed project as the “single largest housing development New York City has seen since 1973.”

It’d have more housing than “Hudson Yards and Battery Park City together, and not just housing but also parks, also childcare, also hospitals — an entire new neighborhood,” Mamdani said.

The Sunnyside Yard project first came about under Mayor Bill de Blasio. Building the project — which at the time included the platform over the rails, new housing, offices and public open space — would cost about $14 billion, according to a 2020 estimate from the city Economic Development Corporation.

Though there was an extensive community engagement process to come up with the plan, then-Councilmember Jimmy Van Bramer and Rep. Alexandria Ocasio-Cortez criticized the process for not reflecting community wants. (Since redistricting, Rep. Nydia Velazquez represents the area, though she is retiring from her seat.)

Then the Covid pandemic hit, de Blasio left office and the project stalled out.

It’s not clear how closely the Mamdani administration will adhere to the original Sunnyside Yard plan.

Councilmember Julie Won (D-Queens), who now represents the area, referenced Van Bramer and Ocasio-Cortez’s criticism and blasted the mayor for meeting with Trump about what she called a “failed housing project” before working with the community.

“Any proposal that reshapes Sunnyside Yards must begin with the neighbors who live here. Our community deserves a seat at the table long before anyone, including the mayor, makes headlines in the Oval Office especially for a project they have previously rejected,” Won said in a statement. “I welcome the opportunity to build more deeply affordable housing and other federal investments for public transit and other infrastructure, but it cannot be done behind closed doors unilaterally.”

The project does not have any public approvals in place yet, but Won urged City Hall to commit to going through a land use review process that would require Council sign-off of the project. Won last year gave her approval to a major rezoning of Long Island City that could result in 14,700 apartments — but only after extended negotiations to ensure several elements she pushed for, including sewer upgrades and the restoration of a park.

Queens Borough President Donovan Richards said he was excited about the prospect of developing Sunnyside Yard, and had tried to get the Adams administration to take another look at it.

“It was obviously a very complicated time with the asylum crisis, and then the relationship — or lack of a relationship with the Biden administration, which wasn’t going to yield us any real federal dollars,” Richards said in a briefing with reporters Friday. “When the check cashes, then I’ll truly believe it, so I don’t want to put the cart before the horse. But at the end of the day, the mere fact that this is generating a national conversation around Queens once again, and Sunnyside Yards is, to me, a great opportunity, especially as we face a looming housing crisis.”

Mamdani on Friday said City Hall has had “a few conversations across elected officials, labor organizers,” and that the conversations will continue.