Demolition is underway at 570 Fifth Avenue, the site of a potential supertall skyscraper in Midtown, Manhattan. Developed by Extell, the tower could reach a height of 1,100 feet and 78 floors on a 43,011-square-foot plot at the corner of Fifth Avenue and West 46th Street. The parcel had mostly sat vacant for the past several years, and includes several old structures that are now in the process of being razed. There is still no architect publicly announced, nor clear indication of the building’s programming, though a series of zoning and massing diagrams and ground-floor plans suggest either an office complex or a residential and hotel development, with the latter reaching supertall status.