Mayor Zohran Mamdani snuck off to Washington, DC, Thursday to pitch President Trump on a housing project — and brought along a photoshopped version of a New York City newspaper in an attempt to flatter him.

The Democratic socialist mayor and the president had a closed-door meeting at the White House that Hizzoner described as “productive.”

“I had a productive meeting with President Trump this afternoon,” he posted on X. “I’m looking forward to building more housing in New York City.”

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Mamdani attached a seemingly heavily edited photo showing him standing at the Resolute Desk next to a seated, beaming Trump, who held a fake front page with the headline: “TRUMP TO CITY: LET’S BUILD” and his portrait.

“Backs new era of housing,” the bogus newspaper cover blared. “Trump delivers 12,000+ homes. Most since 1973.”

In his other hand, Trump held up the famous “FORD TO CITY: DROP DEAD” October 1975 headline from the since-depleted New York Daily News.

Mamdani’s reps said he pitched the president on a road map to adding 12,000 housing units in the Big Apple as part of a project that would include one of the largest federal investments in decades. 

Trump was “enthusiastic” about the plan, Mamdani’s press secretary Joe Calvello told City Hall reporters after the sit-down.

The White House didn’t comment.

City Hall later said the project was proposed for Sunnyside Yard in Queens, which would include 6,000 Mitchell-Lama-style homes and new parks.

The plan would need a $21 billion federal investment, according to City Hall.

No timeline was released but a rep said conversations would be continuing in the coming weeks.

Trump and Mamdani’s Oval Office confab was the mayor’s second since his election in November.

“The first time the president and the mayor met, the president asked him to come back with some big ideas how we can build things together here in New York City, and that’s what he did today,” Calvello said. “The mayor took him up on his offer and went to DC.”

Calvello also said the mayor convinced Trump to release Columbia University student Elaina Aghayeva, who had been detained by ICE agents earlier Thursday, with DHS saying the Azerbaijan native was in the US illegally.

Mamdani provided the president with a list of four other people detained by federal immigration officials, that he hoped the administration would set free, his press secretary said, without providing their identities.

City Hall made no mention that the mayor was leaving the Big Apple ahead of the trip, with nothing on his public schedule. The mayor’s reps only confirmed the planned meeting after The Post first broke news of the secret trip.

The White House also left the meeting off of Trump’s public schedule.

A source said Mamdani flying to DC would help “put icing” on a proposed bill by Massachusetts Sen. Elizabeth Warren that would curb Wall Street’s ability to buy housing.

Mamdani, wearing a black hat and mask, was spotted with his entourage Thursday morning riding in the back of a Delta plane. He was joined by a top adviser, Morris Katz, who has no formal role in City Hall.

Trump on Tuesday night gave Hizzoner a shoutout during the State of the Union.

“The new communist mayor of New York City, I think he’s a nice guy, actually,” Trump said. “I speak to him a lot. Bad policy, but nice guy.”

The president also made a point during his annual address to highlight his focus on creating more housing for Americans. 

“Last month I signed executive order to ban large Wall Street investment firms from buying up, in the thousands, single family homes … And now I’m asking Congress to make that ban permanent, because homes for people — really, that’s what we want,” he said. 

“We want homes for people, not for corporations. Corporations are doing just fine,” the president added, echoing an issue the left has often railed about. 

The commander-in-chief and young Big Apple mayor have been talking often since the two met face to face in DC last year.

Their chummy first White House meeting in November shocked the political world, with insiders dubbing it the start of a “bromance.”

Trump at one point even gave Mamdani cover when the then-mayor-elect was pressed by reporters about his prior attacks on the president.

The pair also discussed housing issues at the time, with Mamdani’s team calling the meeting “productive.”

The mayor’s chief of staff, Elle Bisgaard-Church, told The Post after that Mamdani and Trump spoke about how the city can cut red tape to fast-track housing development.

Bisgaard-Church said Trump was notably interested in Expedited Land Use Review Procedure (EULER), a 90-day streamlined approval process for affordable housing projects with little zoning adjustments.

The typical process for approval —Uniform Land Use Review Procedure, aka ULURP — can drag out past seven months.

“The president felt very interested in a kind of common sense approach to reduce onerous burdens on the housing and development owners, actually,” Bisgaard-Church said at the time.