Trump International Hotel & Tower, Chicago, USA (415 m): The building was originally planned with a large office section on the lower floors, but sales of the residential portion performed so well that the office floors were dropped from the plan. When this project was originally announced, it was proclaimed as a future world's tallest building. After the terrorist acts of September 11, 2001 the plans were scaled down a few hundred feet. Designed by Adrian D. Smith, FAIA, RIBA Design Partner at Skidmore Owings & Merrill LLP. As the tower rises, the floor plan tapers gradually in four steps at heights of 65, 121, 201 and 338 meters.