Here we see a rendering from 1958 that shows the orientation of Philly's prospective urban renewal retail and transportation hub.
Drawing from www.edbacon.org / Mitchell-Giurgola Collection / The Architectural Archives, University of Pennsylvania

This rendering, for a so-called MARKET EAST PLAZA, was part of a revised plan that was presented to city officials in 1964.
Drawing from www.edbacon.org / Mitchell-Giurgola Collection / The Architectural Archives, University of Pennsylvania