On January 27, 1956, the New York Football Giants determined they would be leaving the Polo Grounds, which they had shared with the baseball team of the same name, in order to play their home games at Yankee Stadium in the Bronx. The move by the NFL team fueled rumors that the baseball Giants might also be leaving the stadium soon, an event that did occur following the 1957 season.
Polo Grounds seen from Harlem River in New York City in August 1961 (Dick Leonhardt / Creative Commons Attribution-Share Alike 2.0 Generic license)