Surrey City Hall as Metropolis Department of Justice
Lena and James both testify against Lex, he poisons the judge and the jury as the verdict is read, and meets Eve for the first time as he is being marched to prison.
“The House of L” Filming Locations
Lex learns about the duplicate of Supergirl in Kasnia and manipulates the situation to his own benefit.
Supergirl episode “The House of L” was filmed in Langley, Surrey, Maple Ridge, & Coquitlam in Canada.
9790 198b Street as Kaznian Military Base
The Kaznian Minister of Defense calls Lex and asks for his help with their new acquisition.
E-One Moli Energy as Kasnian Military Lab
Lex supervises a series of tests of Snowbird's strength and abilities.
Surrey City Hall as L Corp
Snowbird poses as Kara and gets into the elevator with Lena to meet her before being admonished by Eve.
Source: What's Filming
20146 100a Avenue as Lot
Otis drops Mikhail off somewhere safe and warns him to stay away from bald men.
East Lawn Building (Riverview Hospital) as National City Hospital
Kara visits Alex and James as Supergirl to warn them about Lex's escape.