Is Chris Christie a New Yorker now?  The former New Jersey governor and his wife Mary Pat paid $1.5 million for a two-bedroom, two-bath loft inside a storied co-op in prime Gramercy. City records obtained by The Post show the unit closed on April 9. It is unclear what the Christies intend to use this space for. The Post has reached out for comment. The seller was listed as a man named Jean-Pierre Riou. Transfer taxes alone ran over $42,000. The building has serious pedigree. The structure dates