A circa-1975 physical layout. The East Wing, completed in October 1974, is shown in gray. The Simpsons-Sears chain had truncated the official name of their stores to simply "Sears" in the summer of 1973. In other news, the mall now had access provided by a recently-opened stretch of the E.C. Row Expressway. It had just been completed east of the Howard Avenue intersection. A western segment would open in 1977.
In a circa-1976 photo, we see the Sears (nee' Simpsons-Sears) Wing of the original mall. The concourse is obviously decked out for the yuletide season.
Photo from http://windsorite.ca/2012/11/retro-windsor-devonshire-mall-in-1976
In this circa-1981 shot, we have the Simpsons Court, in the East Wing of the complex. At the time, Brit-based Marks & Spencer (on the right) was in operation as a junior anchor.
Photo from http://windsorstar.com