A Sears "Store of the Future" was added during an early 1980s expansion of KING OF PRUSSIA PLAZA. The store took the place of a shuttered and demolished Korvettes. Sears opened in July 1983 and anchored the west end of the mall for over 30 years.
Photo from http://www.mitchglaser.com

As construction was getting underway on the new Sears and West Wing, the original section of open-air mall was rebuilt as a fully-enclosed structure. With the completion of the adjacent COURT AT KING OF PRUSSIA mall, in August 1981, the original shopping center was renamed PLAZA AT KING OF PRUSSIA.