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Real-estate investor Joseph Chetrit is listing a collection of three adjacent Upper East Side townhouses for $51 million, $44 million and $39 million apiece.

Mr. Chetrit, whose firm has owned the Sony Building and Hotel Chelsea, bought six adjacent brownstones on East 76th Street from Lenox Hill Hospital in 2007, paying a combined $26 million, public records show. He then combined them into three homes and is now bringing them back to market, each designed in a different style, according to listing agent Richard Steinberg…