Arcadia-based Hinshaw's dedicated their WHITTIER QUAD store in March 1953. One of two locations, it was shuttered in January 1992.
Photo from http://s555.photobucket.com/user/bugsbunnyyy
 

Pasadena's F.C. Nash Company also operated a store in the original QUAD. There were other Nash's locations in Pasadena, Alhambra, Arcadia, Fullerton and the POMONA VALLEY CENTER mall, in Pomona. This general merchandise chain folded in the early-1970s.
Drawing from F.C. Nash & Company

A view of the original -open-air- WHITTIER QUAD. Here, we see the northern shopping concourse, with Bank of America on the left and Barker Brothers Furniture on the right.
Photo from "TokyoMagic!"