Divorcing real estate tycoon hid girlfriend in Park Avenue pad for 2 years

Divorcing real estate mogul Harry Macklowe has been secretly keeping his girlfriend in a Park Avenue apartment for as long as two years, sources tell Page Six.

After Page Six broke the news of the 79-year-old’s impending blockbuster divorce from his wife of 57 years, Linda Macklowe, sources tell us Macklowe put up his French girlfriend Patricia Landeau in an apartment in the Macklowe Properties-owned 737 Park Ave.

A source tells us, “It was no secret in the building that the woman was Harry Macklowe’s girlfriend, and she’s been coming and going for two years. Whether he was living a double life with the girlfriend, or his wife knew about her all along, nobody quite knows.”

Residents in the tony building have included HBO CEO Richard Pleplar, French financier Raymond Svider and Russian princess Kristina Kovalenko.

Macklowe suddenly announced to his wife last week that he was leaving her for the girlfriend, who is president of the French Friends of the Israel Museum, located in Jerusalem.

Multiple sources said Harry was even gallivanting around the Hamptons over Memorial Day weekend with his younger blond gal pal.

Sources said Harry — whose fortune was once estimated at $2 billion — and Linda do not have a pre-nup, setting the scene for an epic divorce battle. Their art collection’s said to be worth $1 billion alone.

When asked about his girlfriend, Harry’s rep declined to comment.

Author Vicky Ward wrote of the Macklowes’ marriage in her 2014 book, “The Liar’s Ball” about the GM Building, “There wasn’t much Linda Macklowe hadn’t seen in her long marriage, a relationship often compared to an Edward Albee play. Both Macklowes have been heard to disparage each other and their marriage forcibly and publicly.

“She has said, ‘I could have had a different life … I should have divorced him.’” He has also complained bitterly. Yet they were inseparable.

“They drive each other crazy and they can’t live without each other,” says a close friend. Until now.