The Western Metal Supply Co. Building was built in 1909. Its integration into Petco’s construction along the left field foul line may be the most inspired element of the downtown ballpark.

Petco Park's Western Metal Supply Co Building puts the "retro" in "retro Major League ballpark." Like Baltimore's Camden Yards on the East Coast, Petco's unique look comes from the preservation of a historic structure, which in San Diego's case was never part of an old park yet has come to define a trip to the iconic site.