03/28/2008 02:45 am ET Updated May 25, 2011

Billionaire Pays $150 Mil For Manhattan "Triplex" Apartment

A billionaire buyer has signed a letter of intent to pay $150 million for a massive triplex apartment at the Upper East Side condo tower The Mark, sources close to the deal told The Post.

The prospective purchaser, sources say, is real-estate magnate Leonard Blavatnik, who is worth $7.2 billion, according to Forbes magazine.

The price would be twice as large as the previous record listing in New York City, and nearly $50 million more than last year's sale of the De Menil estate in East Hampton, believed to be the priciest residential transaction in the country.

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