To those saying "Blade Runner = Whee! Special Effects!" are doing a huge disservice to the movie.
"L.A. 2019" as a set piece was as much a character as any of the actors in the film. It's design and execution was a labor of love that rarely, if ever gets put to screen. Every detail in that movie looks as if it's trying to tell a story. The "Dirty Future" dystopian Sci-Fi setting seems like an obvious trope now. But back then, nobody had managed to do it. The best anyone seemed to be able to do was shoot in the desert, and leave some junk laying around. (Star Wars, Tatooine/Tunisia etc.)
The lighting, the design, the dirt, everything was done in phenomenal detail right down to even designing light poles and construction barricades. And just seven years shy, the future obviously looks nothing like what was depicted in Blade Runner, but it was a realistic cogent vision, that had a great depth of understanding. Seems obvious in hindsight, but someone (Syd Mead, others...) had the genius to realize that looking at our cities "now" (1982), that buildings from 37 years ago were still standing, even ones from 100 years ago, and that the future would be no different, and worked that in.
Movies that had access to technology we couldn't even dream of in 1982 (CGI), or much larger budgets like "The Fifth Element", and the Star Wars Prequels tried to render futuristic cityscapes, and none have come even close to what was created in Blade Runner.