LOUISVILLE, Ky. (WDRB) -- 80/20 at Kaelin's opens Thursday in the original Kaelin's location at the intersection of Newburg Road and Speed Avenue.

That's where the original Kaelin's started in the 1930s. It closed in 2009. A business called Mulligan's Pub and Grill then opened there, but closed in 2014. Now it's under new ownership. 

One of the co-owners of 80/20 at Kaelin's says the location is rich with history. 

"The building has more history than any other building in the state of Kentucky,” said Christopher Fenton. “I consider it one of the most historic restaurants in the country."

According to local legend, the original owner, Carl Kaelin, created the first cheeseburger in 1934 when he put a slice of American cheese on a hamburger patty.

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