This large piece on the outside wall of a building is by TEKSTartist. TEKSTartist’s real name is Jason Markow and most of his work feature words and letters in the design.
My understanding is that this building is in Carlsbad, California which is just north of San Diego. You can purchase some of his work here https://tekstartist.myshopify.com/ and you can read an interview with him here to learn a little more about his work TEKSTartist: 8 Years Later. It has been 8 years since the launch of… | by phraze.eth | Medium