BRmovie.com: Blade Runner Souvenir Magazine - Official Collector's Edition

I can't remember exactly, but I think the pyramid was a composite of my ideas and Ridley's. Originally, the Tyrell building was going to be right in town, it was going to be a massive building right inside the city. We decided it would be much more visual and stark to place it way outside of town, so that it really rose above the horizon. The pyramid was the first miniature that we built. Across its base it was probably eight feet by eight feet. The top was probably two feet square. It was built prior to principal photography, because the first scene shot was the interior of Tyrell's office, and we had to have process plates of the other pyramis outside the window. So we had to build the pyramid, photograph it, prepare the plates and do front projection on that set.
DOUGLAS TRUMBULL (Special Effects Photographic Supervisor)