Grand Central Terminal Station 100th Anniversary, New York City, United States

In 1947, over 65 million people, the equivalent of 40% of the population of the United States, traveled through Grand Central. However, railroads soon fell into a major decline with competition from government subsidized highways and intercity airline traffic.
In 1954, William Zeckendorf proposed replacing Grand Central with an 80-story, 4,800,000-square-foot (450,000 m2) tower, 500 feet (150 m) taller than the Empire State Building. I. M. Pei created a pinched-cylinder design that took the form of a glass cylinder with a wasp waist. The plan was abandoned. In 1955, Erwin S. Wolfson made his first proposal for a tower north of the Terminal replacing the Terminal's six-story office building. A revised Wolfson plan was approved in 1958 and the Pan Am Building (now the MetLife Building) was completed in 1963.
Although the Pan Am Building bought time for the terminal, the New York Central Railroad continued its precipitous decline. In 1968, facing bankruptcy, it merged with the Pennsylvania Railroad to form the Penn Central Railroad. The Pennsylvania Railroad was in its own precipitous decline and in 1964 had demolished the ornate Pennsylvania Station (despite pleas to preserve it) to make way for an office building and the new Madison Square Garden.
In 1968, Penn Central unveiled plans for a tower designed by Marcel Breuer even bigger than the Pan Am Building to be built over Grand Central.