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When the Pepsi Headquarters was built in 1960, the 13-story building at the corner of Park Avenue and 59th Street exemplified the International Style in America. Moreover, it pushed the limits of what was technically possible; its nine-feet-high by thirteen-feet-long glass panes were the largest that could be created and only a half-inch thick. To avoid using heavy mullions or frames the glass was cushioned by neoprene glazing strips, allowing an almost completely flush exterior surface. — blogs.smithsonianmag.com
