In the second half of the 1960s, he would serve as the President of the Leisure World in Laguna Beach, California (which is today Laguna Woods Village); as a member of the Defense Science Board; as a Member of the Board of Advisors of Ryan Aeronautical; and as a member of the Technical Advisory Board of RCA.
The same company developed several other Leisure Worlds around the United States, and started, but did not complete the Rossmoor gated retirement community in Walnut Creek, California.
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The gated Leisure World retirement community in the city of Seal Beach is to the south of Rossmoor, Los Alamitos is to the east and north, and Long Beach is to the west (on the other side of the San Gabriel River, the 605 freeway and the border with Los Angeles County).
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(It was Gittelson who later agreed to annex his Rossmoor Shopping Center property to Seal Beach in the 1960s.) After Rossmoor, Cortese would construct the first of his very successful Leisure World gated retirement community in that part of Seal Beach which is immediately south of Rossmoor.