The sprawling maisonette at 666 Park Ave. could soon return to the market after spending many years completely hidden from view.{ai:summary}<p>Please paste the article text or share a link. I’ll produce a two-paragraph, under-280-char summary in a neutral NY Post tone, with one hashtag from the list at the end.</p>

Exclusive | NYC’s most secretive mansion stands to list for the first time in decades following the death of its heiress owner

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