gross floor area of . The tower received a zoning bonus that enabled its maximum floor area to be expanded by six floors or , a twenty percent increase from the previous maximum allowed floor area of . In exchange, the Hearst Corporation agreed to improve access to the subway station directly underneath, adding three elevators and reconfiguring the subway station's circulation areas. Without the zoning amendment, the Hearst Corporation might have had to pay up to $10 million for additional air rights, as the company had already utilized all the unused air rights above the Hearst Magazine Building. Facade Base The cast limestone facade of the Hearst Magazine Building, now the base, is a New York City designated landmark with of surface area. It is divided horizontally into the two lowest stories, three intermediate stories, and a sixth-story attic. The base's northeastern and southeastern corners are chamfered. A balustrade runs in front of the third-story windows, supported by a shelf with notches, and interrupted by the chamfered corners. A parapet runs above the fifth story, except in the bays above the entrance arches on Eighth Avenue and 57th Street, and at the chamfered corners. With the construction of the Hearst Tower, the base's existing facade was retrofitted to meet updated city seismic codes. Because the original office space was replaced with the atrium in the Hearst Tower's construction, the windows on the third through sixth stories of the facade illuminate the atrium. The main entrance, at the center of the Eighth Avenue elevation, contains a large archway flanked by a pair of smaller rectangular doorways. The archway has gray granite panels at its base, and voussoirs and a beveled keystone at its top, overlapping with a balcony. The barrel-vaulted vestibule inside the archway contains embossed octagonal coffers. The far western end of the vestibule contains an entrance with a bronze frame and four glass doors beneath a bronze-and-glass transom. There is a subway entrance on the right (north) side of the Eighth Avenue entrance vestibule. On either side of the entrance arch, the Eighth Avenue elevation contains glass and metal storefronts at ground level, and seven sash windows at the second stories. On 57th Street, there was formerly a secondary entrance, which was altered to create a storefront topped by a window. There is another subway entrance to the left of the original doorway. The remainder of the ground-story