Inside the tony halls of the posh Pierre at the corner of Fifth Avenue and East 61st Street, the next chapter of a war raging between some of the wealthiest people in the country — including billionaires Howard Lutnick, Larry Ellison and fashion designer Tory Burch — is being written.

The Post broke news last year that the Pierre’s board was in talks with the Sultan of Brunei and the Khashoggi family of Saudi Arabia to sell the historic building — which operates as a hotel and residence owned by a corporation of shareholders — for $2 billion.

Five months later, some outraged co-op owners led by Burch sued the board, alleging they were secretly plotting a shady deal that would kick owners out of their homes — as the massive deal would also include the sale of their units.

After the board released a non-binding term sheet on the deal and three years of board minutes, the case was dismissed with both sides claiming victory.

Gimme Shelter can now reveal more details about the $2 billion bid.

The man behind it is Motasem Khashoggi, a Harvard-educated lawyer known as “MK,” who is a cousin of the late Saudi arms dealer Adnam Khashoggi. Khashoggi is the beneficial owner of Sabre Park Avenue LLC, which is making the $2 billion bid, according to a source familiar with the deal. If the deal happens, Khashoggi would hire the Dorchester Collection, a luxury hotel operator run by Brunei’s sovereign wealth fund, to manage the Pierre.

“It’s all him. It’s his money,” the source said. However, some residents tell Gimme Shelter they still don’t know who is behind the purchase: “We are still in the dark. All we have is the name of a shell company. That’s the problem we have,” one said.

The shareholders who own the Pierre’s 77 residences will vote this fall on the bid. If a two-thirds threshold is met, the sale will pass and owners will have to surrender their homes — or they will be evicted and forfeit their share of the sale, sources said.

If the shareholders vote to sell to Khashoggi, they will have the option to buy back into the Pierre after the renovations, which could take five years.

The shareholders also have no say in how much they will receive for their apartments. At one meeting, some residents said they were dramatically handed sealed envelopes that had the sale price they’d be forced to accept if the sale passes.

All of the shareholders, including publishing heir Austin Hearst, Princess Firyal of Jordan, musician Art Garfunkel and Hollywood producer Irwin Winkler, are now waiting for a proxy statement to explain the terms of the sale. But no date has been set for its release, a source for the board’s legal team told Gimme.

Given the lack of information and the absence of a proxy statement, the board called a meeting on Wednesday to deliver a presentation that would provide what little information they could to shareholders about the bid.

About 45 co-op owners attended a three-hour meeting, including Burch, while others, like ex-Disney chair Michael Eisner, attended by Zoom. But the hotly contested meeting turned out to be a “disaster with lots of shouting and tears.”

“I learned nothing,” said one resident. “A lot of it was optics. They didn’t share any numbers.”

At the meeting, the Dorchester Group delivered a presentation about what the Pierre would look like if they would be running it — after the residents had been kicked out of the building.

“It was tone deaf,” the resident said.

“I almost felt sorry for the Dorchester guy. I think they were surprised by the reaction of the shareholders and shocked by the animosity,” the resident added.

A source for the buyer says the purchase price being offered for the homes as part of the $2 billion sale is generous and “three or four times” the value of each residence. Others say the price is too low.

Around 700 people will also lose their jobs at the residence, if two thirds of the shareholders vote to sell the building this fall.

Some of the co-op owners are in their 80s and 90s. They are already rich, and don’t want to move for any price.

Other residents say the board has not been transparent since the talks began a few years ago and improperly rejected an offer from the Taj Group, which currently has a lease to run the hotel and residences — and has been doing so since 2005.

Earlier this week, Taj sent a letter to the board stating that it will invest $300 million for repairs and renovations — without uprooting the residents. (Another insider told Gimme that Taj is not “credible” in part because the building is in need of $400 million worth of repairs that were not made earlier under its watch.)

“This is about morals, ethics and transparency. People should not be forced to leave their homes and have 700 people fired … especially as a result of a deceptive, misleading and opaque process orchestrated by some of the board members and their advisors,” Burch, who has lived in the building for 28 years, told Gimme Shelter.

David Johnson, president of the board, declined to comment on Wednesday’s meeting or the proposed $2 billion buyout, saying: “It was a private meeting among shareholders and it is inappropriate to discuss it.”

The deal would be brokered by Newmark Group, a Cantor Fitzgerald company now run by Lutnick’s sons, Brandon and Kyle, after their father stepped down as Cantor’s chairman and CEO in 2025 to become Commerce Secretary.

That means one of the Pierre’s own co-op owners — Lutnick, who bought the building’s trophy penthouse for $44 million in 2017 but never moved in — has sons whose firm stands to collect a fee on the very sale he’d profit from as a shareholder.

It’s getting ugly.

“Shareholders need more transparency from the board and its agents,” said Hearst.

Added another resident: “It’s an abuse of power and a dereliction of [the board’s] duties. We just don’t know what kind of deals were made on the side. We love our hotel and they want to gut it, change it, and fire the staff and in return we can get a reservation at the Dorchester hotels. They are playing bad pool. I’m so tired of the duplicity.”

People on both sides agree on one thing: the public fight is devaluing the building.

“This is not just a story about wealthy people fighting. If this passes, it will set a precedent for co-ops across the city. Anyone’s home is vulnerable,” the resident added. “We love the Pierre. Yes, it needs work, but we love its old-world charm. We don’t want some marbled new structure. It’s historic and part of New York.”