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One57 build­ing in the sky­line of New York City as seen from the Rock­e­feller Cen­ter Obser­va­tion Deck.Roberto Macha­do Noa | LightRock­et | Get­ty Images­The sell­er of a lux­u­ry con­do apart­ment on Man­hat­tan’s Bil­lion­aires’ Row took a loss of at least $12 mil­lion to offload the prop­er­ty, accord­ing to pub­lic filings.The 4,500-square-foot con­do at 157 West 57th Street, or One57, went into con­tract last week after being list­ed for $22.5 mil­lion, accord­ing the Olshan Lux­u­ry Mar­ket Report, which tracks Man­hat­tan sales con­tracts. The pur­chase price is unknown, and bro­kers declined to com­ment on price or the the iden­ti­ty of the buy­ers or sellers.The apart­ment was pur­chased by the sell­er in 2014, at the peak of the Man­hat­tan real estate craze, for $34 mil­lion. Assum­ing that it sold for below the list­ing price — which is likely …