National League President Warren Giles appoints a committee to study the possible expansion of the league to 10 teams. At the meeting, William Shea outlines plans for a $12 million stadium at Flushing Meadows, the eventual site of Shea Stadium.

On July 7, 1958 National League President Warren Giles appoints a committee to study the possible expansion of the league to 10 teams. At the meeting, William Shea outlines plans for a $12 million stadium at Flushing Meadows, the eventual site of Shea Stadium.

Source:
Baseball Reference July 7