A circa-'75 site plan shows original store block designations in green. The circa-1954 mall encompassed Building A through F.  Buildings G and H were added in the early '60s, with Building I completed in 1969. By the time of the 1970s enclosure (in medium gray), these designations were becoming redundant.
    

An aerial view from the mid-1970s shows the sheer size of the sprawling shopopolis. It covered approximately 1.5 million leasable square feet and contained 168 stores and services beneath its roof. 
Photo from Library of Congress / Balthazar Korab Studios, Limited