The New York Times Co. is in talks with an investment firm to sell several floors of its Manhattan HQ to help pay off debt. The company reported negotiations to sell the 19 floors it uses in the 42nd Street building with W.P. Carey & Co. about a possible sale-leaseback deal, which would let it sell the building and lease it back or borrow against it. It does not include the six floors it leases to tenants. The Times had been trying to raise $225 million from its HQ last week announced a $250 million investment from Mexican billionaire Carlos Slim Helu.