Making Sheik Hamad a harder sell is his diplomatic immunity: If he were to miss payments on his co-op fees, forcing him to make good would be near impossible. The stopper for his prospective neighbors on Fifth Avenue seemed to be that he was planning to consolidate two adjoining apartments, giving him several votes on the board.

The sale of the One57 penthouse in May came days after news broke that he been foiled in his attempt to buy the Clark properties. “He decided to buy the One57 penthouse after the Huguette Clark rejection,” a source told the New York Post, which broke the story .If so, the owners at One57 aren't finished benefiting from the sheik's frustration. Reports on Monday say that Sheik Hamad is in talks to buy four other floor-through apartments in One57, driving his total expenditure in the building to $250 million.

The brother of the founder of modern Qatar, the sheik has been prime minister of the oil-rich nation since 2007. He has significant real-estate investments in London and is owner of the world's eighth-largest yacht, the 133-foot Al Mirqab.

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