In 1963, KING OF PRUSSIA PLAZA housed tenants such as a Korvettes discount mart, F.W. Woolworth and prototype, full-line J.C. Penney. The complex spanned around 700,000 leasable square feet, with an eventual fifty stores and services. Free parking was provided for 9,000 autos. One might notice that the designations of two adjacent Interstate highways are different than they are today. These roadways would be renumbered in February 1964.

An octagonal John Wanamaker (a.k.a. Wanamaker's) department store opened for business in August 1965. It featured two restaurants, The Rose Garden and Coffee Shop, a beauty salon and the Audobon Community Room.

In the mid-1960s, an enclosed concourse, known as the Piccadilly Arcade, was added to the PLAZA. It featured 2 shopping levels and was anchored by a new Gimbels-Philadephia. By the time of this circa-1973 layout, the original, open-air section (in black) is known as the Outdoor Mall. The newer air-conditioned concourse is referred to as the Enclosed Mall.

A physical layout of the shopping hub, circa-1986. The circa-1963 open-air mall area had re-opened, as a fully-enclosed structure, in December 1980. With the completion of the adjacent COURT AT KING OF PRUSSIA mall, in August 1981, the original shopping hub was renamed PLAZA AT KING OF PRUSSIA.