The project is for pre-50's stuff. In the mid 50's I can even recall going to McDonalds. On E St in San Bernardino Cal.
My hometown didn't get McDonalds till the late 1980s. Of course it is a much smaller town than San Bernadino CA (~8000 people in the late 80s). I guess it depended on where you lived at the time since it was so early in Mickey D's expansion.
I went to the McDonald's on Florence and Lakewood in Downey, Calif in the early early fifties. It is on the National Register today, and can never be torn down.