On August 19, 1957 — Citing poor attendance as the reason, Giants’ president Horace Stoneham, ignoring baseball’s edict of banning announcements about relocation of franchises until after the World Series, informs the press the club has signed a lease to play its home games in San Francisco next season. The club’s Board of Directors voted 8-1 approving the shift to the West Coast, with the only dissenting vote cast by M. Donald Grant, who will become the chairman of the Mets, an expansion team located in New York to fill the National League void created by the departure of the Giants and Dodgers to California.

Sources:
National Pastime

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