Left, Pelli Clarke Pelli Architects; Rogers Stirk Harbour & Partners; Kohn Pedersen Fox Architects
Designs Unveiled for Tower Above Port Authority Bus Terminal by Richard Rogers, Cesar Pelli, and Kohn Pedersen Fox Architects:

The on-again, off-again plans to build an office tower over the north wing of the Port Authority Bus Terminal took at least a conceptual step forward on Thursday with the unveiling of competing designs by three leading architectural firms.
Easily the most striking is a 42-story constructivist assemblage by the London firm Rogers Stirk Harbour & Partners, which is also designing Tower 3 at the World Trade Center site. It takes the form of four discrete boxes stacked atop one another and bound together by open diagonal trusswork that echoes the bold X-shaped steel braces girdling the main terminal below.
In complete contrast, for its suavity and lucidity, is a proposal by the Manhattan firm Kohn Pedersen Fox Architects. The central element of this plan is a sheer, glass-clad, 48-story tower whose surface has an almost icy gleam. In this plan, the X braces would recede in importance behind a screen.