In a snapshot from 1959, WELLINGTON SQUARE is in the early stages of construction.
Photo from Webb & Knapp (Canada) Limited Annual Report 1959
 

By mid-1960, the mall is nearing completion.
Photo from Webb & Knapp (Canada) Limited Annual Report 1960

The original shopping center was anchored by a ginormous Eaton's of Canada. "London's shopping showplace" extended upward for four levels and covered 248,000 square feet.  
Photo from World Wide Sales Agencies, Limited