20146 100a Avenue as Luthor Corp Garage
Lena finds Lex returning to demand to know why he didn't make their meeting and realizes he is working with Brainy.
“Back from the Future: Part One” Filming Locations
Winn returns from the future to stop his alternate universe double from ruining his life.
Supergirl episode “Back from the Future: Part One” was filmed in Langley, Vancouver, Burnaby, & Pitt Meadows in Canada.
Pacific Coliseum (PNE) as National City Toy Con
Kara and William are interviewing Lex for CatCo when Toyman attacks in an attempt to kill Chester Dunholtz.
Livestock Barns (PNE) as Toyman's Lair
Toyman prepares his weapons in his father's old lair but by the time the team arrives he is already gone.
Riverside Community Church as National City University
Andrea is presenting her next generation VR technology when Toyman attacks with robotic tigers to get his revenge.
Source: JenEggleston — Twitter, oman143 — Twitter via midnightscribe99