Book excerpt: The Buildings of Main Street is the primary resource for interpreting commercial architectural style. Richard Longstreth, a renowned and respected author in the field of historic preservation, presents a useful survey of commercial architecture in urban America. He has developed a typology of architectural classification for commercial application in American towns across the United States. Likely to be enjoyed by both students and members of the general public seeking an introduction to commercial architecture, The Buildings of Main Streetmakes a significant and lasting contribution to American architectural history.