A mystery buyer, believed to be from Qatar, could be on the verge of buying the most expensive home in the history of the U.S.

According to a report from The Real Deal, which focuses on New York real estate, a Qatari buyer is considering combining several penthouse apartments at an “ultra-luxe” development in Central Park South into one massive apartment.

The rumored price tag? $250 million.

From the Real Deal report:

The Robert A.M. Stern-designed building’s latest condo offering plan includes seven penthouses. Two of them, Penthouses 75 and 76, don’t have a price tag, leaving open the possibility that they could be combined into a single unit of nearly 14,000 square feet. The other five penthouses, all ostensibly on lower floors, have price tags of more than $50 million. Penthouse 73, which spans over 9,500 square feet, is the most expensive unit currently listed, at $100 million, but sources said that pad is already in contract.

According to the report, the buyer, developer and architect are still working through the details of which apartments would be combined.

But if the price tag does reach $250 million, the apartment would be the priciest in the country, topping the $195 million Beverly Hills mansion that hit the market last year.

Including the projected record-breaking apartment, the building’s total sellout is projected to reach a ludicrous $2.84 billion.