by four steel-and-concrete "super columns", which each measured tall and were placed to the west and east of the auditorium. Resting on the columns were two concrete-encased steel trusses, measuring long by tall and connected by 17 crossbeams. The theater's lobby, as well as the hotel's entrance and some retail shops, were on the ground story. The entrance to the theater was at approximately the same location as in the original building, and the lobby from the old office wing was preserved. The theater lobby was divided into two sections leading into a foyer. Above that was a five-story atrium with some of the hotel's public spaces, which were placed between the beams, and 36 guestroom stories. A emergency exit was preserved on the eastern side of the theater. Within the theater itself, mezzanine restrooms, an air-conditioning system, and an elevator to the second balcony were installed. Furthermore, the backstage facilities were enlarged. The Palace Theatre's original facade on 47th Street, consisting of rusticated limestone blocks at the first floor and brick on the upper stories, still remained but was not protected as a New York City landmark. The theater's lobby was also not protected as a landmark. TSX Broadway , the DoubleTree/Palace site is being redeveloped as part of TSX Broadway, a $2 billion mixed-use structure with a 669-room hotel, which is being built around, above, and below the Palace's auditorium. To meet city building codes, the new structure retains the lowest 16 stories of the DoubleTree structure, with new concrete slabs being poured around the old ones. The area occupied by the 1987 lobby is being replaced with retail space, extending three levels below ground. This requires the auditorium to be raised by about . The auditorium will be supported by columns that, in turn, rest on caissons extending deep. The new ground-story space includes of outdoor entertainment space and of retail. In addition, about of back of house space would be created. The plans also include relocating the main entrance to 47th Street, where the facade has been raised and a marquee sign measuring long will be installed. Escalators along 47th Street will connect the new entrance to a new orchestra-level lobby next to the raised auditorium. The new development includes about of exterior signage. In total, the theater will be expanded from . Auditorium The auditorium, which the New York City Landmarks Preservation Commission (LPC) has