American Pie filmed at Caffe Opera, Monrovia. This café was an empty shop dressed up as the Dog Years diner where the friends hang out. On screen it's Dog Years.
Probable Named in published production coverage; the coordinate is the place itself, checked against a gazetteer.
Planning the trip? The United States travel atlas covers money, language and getting aroundand everything filmed in Monrovia is on one page
Venture keeps every scene location on one map, sorted by how far you'd have to walk. Open it in Monrovia and it tells you what was shot around you, how to get there, and whether you can actually go in.
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