Im reminded of the 1961 movie, West Side Story. Only the opening, I think the first 10 or 15 minutes, of the movie was shot on location in New York City (in Manhattan on West 67th street and east 110th Street: which was the cement playground area).
The remainder of the movie, most of it, were all shot on a Hollywood soundstage. Even though the movie was filmed and released years before I was born (and West 67th was demolished), growing up in New York City in the 1970s, there were lots of other real life areas in the city that still looked exactly like how it looks in the movie.
Watching the movie today, even though i know the scenery switches from a real life New York city to a fake New York City, it’s still pretty difficult to tell exactly when and where in the movie the real NYC ends and the fake NYC begins. The Hollywood set designers of West Side Story really did a most excellent job of making a fake NYC set in a Hollywood sound stage look truly authentic.
End of an era indeed.