Actually, BGC was heavily based on Blade Runner. It features similar settings and plot devices. Both feature a huge corporation whose headquarters is a pyramid shaped building, and both feature characters named "Priss" and "Leon". It even uses scenes based on scenes that were either scripted for Blade Runner, but never filmed (i.e.: when Sylvie and Anri escape the Genaros Space Station, and when Largo kills Quincy only to discover that Quincy was an android double). There are even some scenes in episodes five and six that were copied word for word from Blade Runner.
There was a remake series, which was well written, but I thought it wasn't quite as good as the original.
Until the day, till all are one.