The new tower rises above the old building to a height of forty-four-storeys, linked on the outside by a skirt of glazing that encourages an impression of the tower floating weightlessly above the base. At the base of the tower, the main spatial event is a lobby that occupies the entire floor plate of the old building and rises up through six floors. Like a bustling town square, this dramatic space provides access to all parts of the building. It incorporates the main elevator lobby, the Hearst staff cafeteria and auditorium, and mezzanine levels for meetings and special functions. Structurally, the tower has a triangulated 'diagrid' form - a highly efficient solution that uses 20 per cent less steel than a conventionally framed structure. With the corners cut back between the diagonals, it creates a distinctive facetted silhouette on the Manhattan skyline.