With the show being filmed in the Vancouver area, many local industries will substitute for Smallville and Metropolis businesses. For the scene where Clark buys a car with stolen money in "Exile", the production crew converted a local bank lobby into a dealership showroom. The Vancouver YMCA served as a stand-in for the Smallville Medical Center. The interior scenes of Summerholt Institute were shot in a local train-car washing building, so that they had enough room to create and film the tank of kryptonite solution. The set was found early in the production of season three, but the crew could not find a use for it until then. The exterior shots were filmed at an abandoned building owned by the Sierra Wireless Company. The building was a spare built by Sierra Wireless to accommodate their growing company. The flashback sequences filmed in "Memoria", of a young Lex with his infant brother Julian, were shot underneath the St. George's Preparatory School, on a specially designed set by Rob Maier. St. George's also doubled as Lex's childhood prep school. The LuthorCorp facility was constructed at an active sewage treatment facility in the Vancouver area. David Willson built the LuthorCorp labs inside the facility's hallways.