sentences:  The Glendale location (5373 N. Port Washington Ave.) is on the site of the former Milky Way drive-in restaurant, the inspiration for the external look of the "Happy Days" diner, Arnold's Drive-In.Kopp's is now owned by Elsa's son, Karl Kopp, who also owns Elsa's on the Park on Jefferson St. in downtown Milwaukee which opened New Year's Eve of 1980.He has also opened restaurants in Arizona and New York.