Where was Detroit 9000 filmed?

1973 film by Arthur Marks

Detroit 9000 (1973) was filmed in Westin Book Cadillac Hotel and Sacred Heart Major Seminary, 2 places named in its Wikipedia article's Filming section, in the United States. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.

See them on the map → Wikipedia Source data