The Haffen Building is a historic New York City landmark constructed in 1901-1902 in the neighborhood of North New York (now known as Mott Haven), Bronx, New York. The building is located at 2804 Third Avenue, also addressed as 507 Willis Avenue, in the middle of a triangular block between 148th Street, 147th Street, Third Avenue, and Willis Avenue, within the Hub business district. It was inspired by the economic growth and upper middle-class status that was prevalent in the area during the period. When constructed, the Third Avenue and Second Avenue elevated train line stopped at 149th Street, a station in front of it.