NEW YORK CITY — Fidelity National Title Insurance Co. is relocating its New York City headquarters to 485 Lexington Ave. The company, which provides real estate-related products and services, including title insurance, signed a 7-year lease for 27,996 square feet. The office is about 5,000 square feet larger than the company's existing space at 1 Park Ave. and occupancy is slated for this spring. Leon Manoff and Robert Kennedy of Colliers International represented Fidelity in the transaction. David Amsterdam of SL Green represented the landlord.