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In page Park Avenue:

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A tradition was introduced in 1945 as a memorial to American soldiers killed in action, whereby Christmas trees are placed in the median and lit up on the first Sunday in December at Brick Presbyterian Church.[4] On May 5, 1959, the New York City Council voted 20–1 to change the name of Fourth Avenue between 17th and 32nd Streets to Park Avenue South. The renaming, along with a ban on overhanging signs along the newly renamed Park Avenue South, was intended to improve the character of the avenue.[5] The Pan Am Building (now MetLife Building), in between the Park Avenue Viaduct's legs north of Grand Central Terminal, was opened in 1963.[6]