The New York Yankees sign a 30-year lease to play in renovated Yankee Stadium starting in 1976; they will share Shea Stadium with the New York Mets while the renovations take place in 1974 and 1975.

This Day In Baseball

On August 8, 1972 — The New York Yankees sign a 30-year lease to play in renovated Yankee Stadium starting in 1976; they will share Shea Stadium with the New York Mets while the renovations take place in 1974 and 1975.

Source:
Baseball Reference August 8
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