Illustrated Architecture Dictionary

Cornerstone

1 - A foundation stone

2 - A stone prominently situated near the base of a corner in a building, carrying information recording the dedicatory ceremonies, and in some instances containing or capping a vault in which contemporary memorabilia are preserved

Usually found on the right side of a building.

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Examples from Buffalo architecture:

• Illustration above: Holy Angels Academy / D'Youville College Montante Family Library
  
  
• St. John's United Evangelical Church / St. John's United Church of Christ
  
  
• Annunciation RC Church
  
  
• Richardson-Olmsted Complex

• Kensington High School / Olmsted School