In the first draft script of "Future's End, Part II", this area was instead referred to as "LA Plaza" in Rain's line of dialogue, though it was consistently called "Metro Plaza" in the same teleplay's stage directions. The dialogue referred to it as "Metro Plaza" by the time the final draft of the script was written.
There is, in reality, no Metro Plaza in Los Angeles. The scenes set there were actually filmed at the Music Center on Grand Avenue in LA. (Star Trek Encyclopedia 2nd ed., p. 300)